Narrow Band-pass filtering techniques have been a challenging task since the inception of audio and telecommunication applications. The challenge involves keeping quality factor, gain and mid-frequency of the filter independent of each other. The critical applications require a design that ensures mid-frequency immune to the circuit component tolerances. It becomes increasingly difficult for low-frequency applications where the shift in few Hz in mid-frequency would cause desired frequencies to fall outside the filter’s bandwidth and go undetected. (...) The selection of right topology of the filter for the best performance is the key to successful design. This book objectively compares the relative performance of none popular narrow band-pass filter topologies. The filter topologies are evaluated using a real-world practical example of designing an extremely narrow band-pass filter. The book provides guidelines for selecting the right topology for the low-frequency narrow band-pass filter. (shrink)

Dichotic spectral integration range, or DSIR, was measured for consonant recognition with normal-hearing listeners. DSIR is defined as a frequency range needed from 0 to 8,000 Hz band in one ear for consonant recognition when low-frequency information of the same consonant was presented to the opposite ear. DSIR was measured under the three signal processing conditions: unprocessed, target: intensified target spectro-temporal regions by 6 dB responsible for consonant recognition, and target minus conflicting: intensified target regions minus spectro-temporal regions that (...) increase confusion. Each consonant was low-pass filtered with a cutoff frequency of 250, 500, 750, and 1,000 Hz, and then was presented in the left ear or low-frequency ear. To create dichotic listening, the same consonant was simultaneously presented to the right ear or high-frequency ear. This was high-pass filtered with an initial cutoff frequency of 7,000 Hz, which was adjusted using an adaptive procedure to find the maximum high-pass cutoff for 99.99% correct consonant recognition. Mean DSIRs spanned from 3,198–8,000 Hz to 4,668–8,000 Hz, depending on low-frequency information in the LF ear. DSIRs narrowed with increasing low-frequency information in the LF ear. However, the mean DSIRs were not significantly affected by the signal processing except at the low-pass cutoff frequency of 250 Hz. The individual consonant analyses revealed that /ta/, /da/, /sa/, and /za/ required the smallest DSIR, while /ka/, /ga/, /fa/, and /va/ required the largest DSIRs. DSIRs also narrowed with increasing low-frequency information for the two signal processing conditions except for 250 vs. 1,000 Hz under the target-conflicting condition. The results suggest that consonant recognition is possible with large amounts of spectral information missing if complementary spectral information is integrated across ears. DSIR is consonant-specific and relatively consistent, regardless of signal processing. The results will help determine the minimum spectral range needed in one ear for consonant recognition if limited low spectral information is available in the opposite ear. (shrink)

Weak measurement devices resemble band pass filters: they strengthen average values in the state space or equivalently filter out some ‘frequencies’ from the conjugate Fourier transformed vector space. We thereby adjust a principle of classical communication theory for the use in quantum computation. We discuss some of the computational benefits and limitations of such an approach, including complexity analysis, some simple examples and a realistic not-so-weak approach.

Frequency selective surface -based intelligent spatial filters are capturing the eyes of the researchers by offering a dynamic behavior when exposed to the electromagnetic radiations. In this manuscript, a concept of creating complementary structures which stems from Babinet’s principle is illustrated. A hybrid complementary pair of FSS comprising double square loop FSS and double square slot FSS on either side of the dielectric substrate is proposed. DSLFSS offers band-pass behavior and can be placed as a superstrate, whereas DSSFSS (...) behaves as a band-stop intelligent spatial filter that blocks the radiations falling on it, thus making them applicable for use as a substrate. The technique utilized for analyzing DSLFSS and DSSFSS structures is based on the equivalent circuit modeling and transmission line methodology. The CPFSS structure offers the design simplicity, hence, suitable for placing them with the printed patch antenna radiators in wireless networking devices operating in sub-6 GHz 5G spectrum. DSLFSS offers band-pass behavior ranging from 2.99 to 5.56 GHz, whereas DSSFSS offers band-stop behavior ranging from 2.85 to 5.42 GHz covering all n77, n78, and n79 bands of FR1 spectrum of sub-6 GHz 5G range. The passband and the stopband offered by the two structures of CPFSS geometry are stable to oblique angles of incidence and the proposed design also offers polarization-independent behavior. The thickness of the dielectric region existing within the pair of designed structures is critical for the location of the passbands and the stopbands. The impact of the overall thickness of the dielectric substrate on the passbands and stopbands is also reported in this article. (shrink)

Common spatial pattern is an effective algorithm for extracting electroencephalogram features of motor imagery ; however, CSP mainly aims at multichannel EEG signals, and its effect in extracting EEG features with fewer channels is poor—even worse than before using CSP. To solve the above problem, a new combined feature extraction method has been proposed in this study. For EEG signals from fewer channels, wavelet packet transform, fast ensemble empirical mode decomposition, and local mean decomposition were used to decompose the (...) class='Hi'>band-pass filtered EEG into multiple time–frequency components, and the corresponding components were selected according to the frequency characteristics of MI or the correlation coefficient between its time–frequency components and the original EEG signal. Furthermore, phase space reconstruction was performed on the selected components after the three time-frequency decompositions, the maximum Lyapunov index was calculated, and the features were reconstructed; then, CSP projection mapping was used for the reconstructed features. The support vector machine probability output model was trained by the obtained three mappings. Probability outputs by three different support vector machines were then obtained. Finally, the classification of test samples was determined by the fusion of the Dempster–Shafer evidence theory at the decision level. The results showed that the accuracy of the proposed method was 95.71% on data set III of BCI competition II, which was 2.88% higher than the existing methods. On data set IIb of BCI competition IV, the average accuracy was 86.60%, which was 2.3% higher than the existing methods. This study verified the effectiveness of the proposed method and provided an approach for the research and development of the MI-BCI system based on fewer channels. (shrink)

We provide a critical assessment of the National Science Foundation's (NSF) “broader impacts criterion” for peer review, which has met with resistance from the scientific community and been characterized as unlikely to have much positive effect due to poor implementation and adherence to the linear model heuristic for innovation. In our view, the weakness of NSF's approach owes less to these issues than to the misguided assumption that the peer review process can be used to leverage more societal value from (...) research. This idea, although undoubtedly well-meaning, is fundamentally flawed. Retooling or refining the Broader Impacts Criterion does not alter the fact that conventional peer review, based on specialized scientific and technical expertise, is not up to the task of ensuring adequate judgements about social impact. We consider some possible alternative approaches to providing greater social impact in science and include in our assessment past and current efforts at NSF and throughout the federal research establishment that address, in some cases having addressed for decades, the intentions and goals of the Broader Impacts Criterion, albeit using alternate mechanisms. We conclude that institution-building and explicit and targeted policy-making are more useful and democratically legitimate approaches to ensuring broad social impacts. (shrink)

We provide a critical assessment of the National Science Foundation's “broader impacts criterion” for peer review, which has met with resistance from the scientific community and been characterized as unlikely to have much positive effect due to poor implementation and adherence to the linear model heuristic for innovation. In our view, the weakness of NSF's approach owes less to these issues than to the misguided assumption that the peer review process can be used to leverage more societal value from research. (...) This idea, although undoubtedly well-meaning, is fundamentally flawed. Retooling or refining the Broader Impacts Criterion does not alter the fact that conventional peer review, based on specialized scientific and technical expertise, is not up to the task of ensuring adequate judgements about social impact. We consider some possible alternative approaches to providing greater social impact in science and include in our assessment past and current efforts at NSF and throughout the federal research establishment that address, in some cases having addressed for decades, the intentions and goals of the Broader Impacts Criterion, albeit using alternate mechanisms. We conclude that institution-building and explicit and targeted policy-making are more useful and democratically legitimate approaches to ensuring broad social impacts. (shrink)

The motor modules during human walking are identified using non-negative matrix factorization from surface electromyography signals. The extraction of motor modules in healthy participants is affected by the change in pre-processing of EMG signals, such as low-pass filters ; however, the effect of different pre-processing methods, such as the number of necessary gait cycles in post-stroke patients with varying steps, remains unknown. We aimed to specify that the number of GCs influenced the motor modules extracted in the consideration of (...) LPFs in post-stroke patients. In total, 10 chronic post-stroke patients walked at a self-selected speed on an overground walkway, while EMG signals were recorded from the eight muscles of paretic lower limb. To verify the number of GCs, five GC conditions were set, namely, 25, 20, 15, 10, and 5 gate cycles with three LPFs. First, the number of modules, variability accounted for, and muscle weightings extracted by the NNMF algorithm were compared between the conditions. Next, a modified NNMF algorithm, in which the activation timing profiles among different GCs were unified, was performed to compare the muscle weightings more robustly between GCs. The number of motor modules was not significantly different, regardless of the GCs. The difference in VAF and muscle weightings in the different GCs decreased with the LPF of 4 Hz. Muscle weightings in 15 GCs or less were significantly different from those in 25 GCs using the modified NNMF. Therefore, we concluded that the variability extracted motor modules by different GCs was suppressed with lower LPFs; however, 20 GCs were needed for more representative extraction of motor modules during walking in post-stroke patients. (shrink)

The central paradigm of arti?cial intelligence is rapidly shifting toward biological models for both robotic devices and systems performing such critical tasks as network management, vehicle navigation, and process control. Here we use a recent mathematical analysis of the necessary conditions for consciousness in humans to explore likely failure modes inherent to a broad class of biologically inspired computing machines. Analogs to developmental psychopathology, in which regulatory mechanisms for consciousness fail progressively and subtly understress, and toinattentional blindness, where a (...) class='Hi'>narrow 'syntactic band pass' de?ned by the rate distortion manifold of conscious attention results in pathological ?xation, seem inevitable. Similar problems are likely to confront other possible architectures, although their mathematical description may be far less straightforward. Computing devices constructed on biological paradigms will inevitably lack the elaborate, but poorly understood, system of control mechanisms which has evolved over the last few hundred million years to stabilize consciousness in higher animals. This will make such machines prone to insidious degradation, and, ultimately, catastrophic failure. (shrink)

This abstract presents a novel brain-computer interface (BCI) framework to control a prosthetic leg, for the rehabilitation of patients suffering from locomotive disorders, using functional near-infrared spectroscopy (fNIRS). fNIRS signals corresponding to walking intention and rest are used to initiate and stop the gait cycle and a nonlinear proportional derivative computed torque controller (PD-CTC) with gravity compensation is used to control torques of hip and knee joints for minimization of position error. The brain signals of walking intention and rest tasks (...) are acquired from primary motor cortex in the left hemisphere for nine subjects. After acquiring brain signals, in order to remove motion artifacts and physiological noises, the performance of six different filters i.e. Kalman, Wiener, Gaussian, hemodynamic response filter (hrf), Band-pass and finite impulse response, is evaluated. Afterwards, six different features are extracted from oxygenated hemoglobin signals and their different combinations were used for classification. The classification performance of five different classifiers i.e. artificial neural network, quadratic discriminant analysis, linear discriminant analysis (LDA), Naïve Bayes and support vector machine (SVM) is used. The classification accuracies obtained from SVM using hrf filter are significantly higher (p < 0.005) than the other combinations of classifier and filters. These accuracies are 77.5%, 72.5%, 68.3%, 74.2%, 73.3%, 80.8%, 65%, 76.7%, and 86.7% for all nine subjects. The control commands generated using classifier initiate and stop the gait cycle of the prosthetic leg whose knee and hip torques are controlled using PD-CTC to minimize position error. The proposed scheme can be effectively used for neurofeedback training and rehabilitation of lower limb amputation of paralyzed patients. (shrink)

This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be (...) preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:136 HISTORY OF PHILOSOPHY man felt two needs :"the theoretical need for guaranteeing a priori the subsistence of an ethical sphere against the Enlightenment's emphasis on happiness, and the political and practical need for guaranteeing individual freedom against an enlightened absolutism" (p. 71). Owing to this double need, Kant seems to be against himself and consequently the most critical and dialectical interpretation of Kant's thought is opposed to the (...) formalistic absolutism used by the Kantian jurists, who reject the most vital and profound critical philosophy for a metaphysical framework which confuses everything as though all were homogeneous. In fact, what appears more valid in Kant's philosophy is the continuous tension between formalism and dialectics, a tension which, even though it is never definitively overcome in a dialectical sense by Kant himself, nevertheless reveals the need for a legal dialectic rather than a formalism. It shows "the destiny of legal right to cease being a coercive apparatus, and of being transformed into rules for human society taken from civil society" (p. 390). Of course, this dialectical perspective suggests new horizons and also new problems and a wide plan of work. However, I agree with the author that the uncertainties which will inevitably emerge in this work must be met urgently and radically. For we know that "on the other scale-pan there are in fact the raw metaphysics of legal positivism, the conservatism of the jurists, and at best the formalistic, paralyzing ascetics" (p. 390). The merit of Negri's book seems to me to lie above all in the lively problematical tension with which he examines the Kantian thought. Following in the paths of G. Gurwitch, Metzger and Goldmann, as well as of Luk~s' History and Class Consciousness, he appreciates and understands the interpenetration of ethical motivations with the social and cultural environment. This historical and philosophical awareness of problems is particularly lively in the pages where the author notices the begging of principle in Kantian thought; a begging of principle consisting in the fact that "the definition of limit presupposes a limit to the principle itself, but the examination of this presupposition is neglected" (p. 77 ft.). Because of this critical and historical tension, Negri's book can be of great interest to the jurist, the philosopher and the historian. And if this ensues, it is because the conception of legal right which the author seeks to assert throughout his theoretical tension is deep-rooted humanly, dialectically, concretely. It is most needed by those who really want to make of law and right not a formal science but a human science. ANTONELLA GUARALDI Bari, Italy The Narrow Pass: Kierkegaard's Concept of Man. By George Price. (New York, Toronto, London: McGraw-Hill Book Co., 1963. Pp. 5-218.) Selon hombre de ses commentateurs, Kierkegaard seralt un ehrdtien passionnd; pour d'autres, il serait une sorte d'incroyant; pour George Price, nous devrions lui accorder une unitd complexe, unitd de production, qui s'exprime directement par la suite de ses oeuvres, unitd d'intention, une vue religicuse qui repose sur une certaine conception de l'homme, un th~me fondamental aussi qui est au centre des diverses discussions sur le pdchd, la foi, la raison, la morale, la subjectivitd et le "paradoxe", tous ces probl~mes qui paraissent se poser et se reposer sans cesse pour Kierkegaard, toujours de mani~re assez nouvelle. L'homme est i~la fois une synth~se de son corps et de son moi, des causes qui ont d'abord faeonnd son ~tre, et de qu'il y a en lui d'original et qui ne sera jamais rdpdtd, ce que son esprit a fait par un effort crdateur. Et d'abord une premiere remarque pour simplifier les vues de Kierkegaard. II n'y a pas ici de substances conjointes, il n'y a que des dvdnements corporels et spirituels. L'influence de Fichte apparait par l'importance accordde au devenir, un devenir qui se poursuit selon un module et qui reste fragile, si la volontd de se rdaliser ne se maintient pas. L'homme dolt se passionner pour son existence, it dolt devenir lui-m~me. La chute de l... (shrink)

In the second half of the twentieth century, a surprising change in the notion of scientific truth gained ground when an evolutionary cosmology made the Newtonian world machine into no more than a passing phase of the cosmos, subject to exceptions in the neighborhood of Black Holes and other unusual objects. Physical and chemical laws ceased to be eternal and universal and became local and changeable, that is, fundamentally historical instead, and faced an uncertain, changeable future just as they had (...) in the initial phases of the cosmos.The earth sciences along with biology had become historical in the nineteenth century; and the Big Bang cosmology in effect brought physics and chemistry into line, allowing venturesome intellects to concoct a new all-embracing worldview that recognizes the catalytic role of the observer in defining what is observed, and how different levels of local complexity provoke new and surprising phenomena--including terrestrial life forms, and most notably for us, humanly-constructed symbolic meanings--of which science is only one example.The article then argues that it is time for historians to take note of the imperial role thus thrust upon their discipline by making a sustained effort to enlarge their views and explore the career of humankind on earth as a whole, thus making human history an integral part of the emerging scientific and evolutionary worldview.Tentative suggestions of how this might be addressed, focusing on changes in patterns of communication that expanded the scale of human cooperation, and thus conduced to survival, follow. Dance, then speech, were early breakthroughs expanding the practicable size of wandering human bands; then caravans and shipping allowed civilizations to arise; writing expanded the scale of coordination; warfare and trade harshly imposed best practice across wide areas of Eurasia and Africa and kept the skills of that part of the world ahead of what the peoples of other continents and islands had at their command. Then with the crossing of the oceans after 1492 our One World began to emerge and swiftly assumed its contemporary shape with further improvements in the range and capacity of communication--for example, printing, mechanically-powered transport, instantaneous data transmission--with consequences for human society and earth's ecosystem yet to be experienced.Much remains to be investigated and, in particular, interactions between the history of human symbolic meanings and the history of other equilibria--ecological, chemical, physical--within which we exist needs further study. But with suitable effort, history can perhaps become scientific and the emerging scientific evolutionary worldview begin to achieve logical completeness by bringing humankind within its scope. (shrink)

. A new spatial-frequency image enhancement algorithm via wavelet homomorphic filtering transform is proposed to enhance the contrast of an image. The wavelet analysis coefficients are processed using a high-pass filter to amplify the high spatial frequencies and attenuate the low spatial frequencies. So the object features can be emphasized while the undesired contributions within the image due to light source nonuniformity can be reduced. Experimental results show that this new algorithm can gain better performance in enhancing the (...) local contrast of an image while maintaining its global appearance, in contrast to some representative algorithms. (shrink)

Speech is intelligible even when the temporal envelope of speech is distorted. The current study investigates how native and non-native speakers perceptually restore temporally distorted speech. Participants were native English speakers (NS), and native Japanese speakers who spoke English as a second language (NNS). In Experiment 1, participants listened to “locally time-reversed speech” where every x-ms of speech signal was reversed on the temporal axis. Here, the local time reversal shifted the constituents of the speech signal forward or backward from (...) the original position, and the amplitude envelope of speech was altered as a function of reversed segment length. In Experiment 2, participants listened to “modulation-filtered speech” where the modulation frequency components of speech were low-pass filtered at a particular cut-off frequency. Here, the temporal envelope of speech was altered as a function of cut-off frequency. The results suggest that speech becomes gradually unintelligible as the length of reversed segments increases (Experiment 1), and as a lower cut-off frequency is imposed (Experiment 2). Both experiments exhibit the equivalent level of speech intelligibility across six levels of degradation for native and non-native speakers respectively, which poses a question whether the regular occurrence of local time reversal can be discussed in the modulation frequency domain, by simply converting the length of reversed segments (ms) into frequency (Hz). (shrink)

The figure of Alexander inevitably dominates the history of his reign. Our extant sources are centrally focussed upon the king himself. Accordingly it is his own military actions which receive the fullest documentation. Appointments to satrapies and satrapal armies are carefully noted because he made them, but the achievements of the appointees are passed over in silence. The great victories of Antigonus which secured Asia Minor in 323 BC are only known from two casual references in Curtius Rufus, and in (...) general all the multifarious activities in the empire disappear from recorded history except in so far as they impinge upon court life in the shape of reports to Alexander and administrative decisions made by him. Moreover, the sources we possess originate either from high officers of Alexander's court, such as Ptolemy and Nearchus, or from Greek historians like Callisthenes and Cleitarchus, whose aims were literary or propagandist and whose interests were firmly anchored in court life. Inevitably Alexander bestrides that narrow world like a colossus and monopolises the historical picture. But even the figure of Alexander is far from fully fleshed. No contemporary history survives, and for continuous narratives of the reign we are dependent upon late derivative writers who saw Alexander through the filter of centuries of rhetoric and philosophy. The king had long been a stock example of many contradictory traits; he was at once the conqueror and the civiliser, the tyrant and the enlightened king. Cicero and Seneca saw him as the type of unbridled license, Arrian as the paradigm of moderation. The result is that the sources present a series of irreconcilable caricatures of Alexander but no uniform or coherent picture. (shrink)

It is widely believed that we are facing a problem, even a crisis, caused by so-called “echo chambers” and “filter bubbles.” Here, David Coady argues that this belief is mistaken. There is no such problem, and we should refrain from using these neologisms altogether. They serve no useful purpose, since there is nothing we can say with them that we cannot say equally well or better without them. Furthermore, they cause a variety of harms, including, ironically, a tendency to (...) narrow public debate within predetermined limits. (shrink)

ObjectiveFreezing of gait is detrimental to patients with idiopathic Parkinson’s disease. Its pathophysiology represents a multilevel failure of motor processing in the cortical, subcortical, and brainstem circuits, ultimately resulting in ineffective motor output of the spinal pattern generator. Electrophysiological studies pointed to abnormalities of oscillatory activity in freezers that covered a broad frequency range including the theta, alpha, and beta bands. We explored muscular frequency domain activity with respect to freezing, and used deep brain stimulation to modulate these rhythms thereby (...) evaluating the supraspinal contributions to spinal motor neuron activity.MethodsWe analyzed 9 PD freezers and 16 healthy controls. We studied the patients after overnight withdrawal of dopaminergic medication with stimulation off, stimulation of the subthalamic nucleus or the substantia nigra pars reticulate, respectively. Patients performed a walking paradigm passing a narrow obstacle. We analyzed the frequency-domain spectra of the tibialis anterior and gastrocnemius muscles in ‘regular gait’ and during the ‘freezing’ episodes.ResultsIn stimulation off, PD freezers showed increased muscle activity of the alpha and low-beta band compared to HC in both TA and GA. This activity increase was present during straight walking and during the freezes to similar extent. STN- but not SNr-DBS decreased this activity and paralleled the clinical improvement of freezing.ConclusionWe found increased muscle activation of the alpha and lower beta band in PD freezers compared to HC, and this was attenuated with STN-DBS. Future studies may use combined recordings of local field potentials, electroencephalography, and electromyography to interrogate the supraspinal circuit mechanisms of the pathological activation pattern of the spinal pattern generator. (shrink)

I advocate a theory of syntactic semantics as a way of understanding how computers can think (and how the Chinese-Room-Argument objection to the Turing Test can be overcome): (1) Semantics, considered as the study of relations between symbols and meanings, can be turned into syntax – a study of relations among symbols (including meanings) – and hence syntax (i.e., symbol manipulation) can suffice for the semantical enterprise (contra Searle). (2) Semantics, considered as the process of understanding one domain (by modeling (...) it) in terms of another, can be viewed recursively: The base case of semantic understanding –understanding a domain in terms of itself – is syntactic understanding. (3) An internal (or narrow ), first-person point of view makes an external (or wide ), third-person point of view otiose for purposes of understanding cognition. (shrink)

This paper critically examines the implications of state efforts to expand prescriptive authority of pharmacists, which will allow them to prescribe various types of hormonal contraceptives. With this expansion, women no longer need to see a physician before being prescribed such contraceptives, but instead, they must answer self-assessment questionnaires at the pharmacy to ensure that their chosen method is safe and appropriate. This paper argues that while these measures to expand pharmacists’ prescriptive authority will surely meet the stated goal to (...) increase access to hormonal contraceptives, the measures may have detrimental consequences that have largely been downplayed. Studies consistently show that the OB-GYN is a significant primary care provider identified by young female patients, and some of the main reasons provided by these young women for going to the OB-GYN is to discuss, or obtain a prescription for, contraceptives. Through the expansion of pharmacists’ prescriptive authority, a likely consequence is that some women will relinquish going to the OB-GYN. However, the OB-GYN provides important services beyond contraceptives, such as preventive screenings for hypertension, cardiovascular diseases, alcohol abuse, mental health, etc., and there is evidence supporting both the effectiveness and cost–benefits of these interventions. By increasing access to contraceptives, the likely result is that many women will have less interaction with a physician and will receive fewer preventive screenings. I do not wish to suggest that these bills should not pass, nor that OB-GYNs should hold contraceptives hostage, only that there are consequences to expanded prescriptive authority that must be anticipated. Further, expanding prescriptive authority obscures the real problem: some individuals have trouble accessing the health care system, not merely trouble accessing hormonal contraceptives. The expansion of prescriptive authority to include contraceptives applies a Band-Aid to treat one aspect of this problem. What is needed is not merely expanded access to hormonal contraceptives, but better access to health care in general. (shrink)

Objective: Tangent Space Mapping using the geometric structure of the covariance matrices is an effective method to recognize multiclass motor imagery. Compared with the traditional CSP method, the Riemann geometric method based on TSM takes into account the nonlinear information contained in the covariance matrix, and can extract more abundant and effective features. Moreover, the method is an unsupervised operation, which can reduce the time of feature extraction. However, EEG features induced by MI mental activities of different subjects are not (...) the same, so selection of subject-specific discriminative EEG frequency components play a vital role in the recognition of multiclass MI. In order to solve the problem, a discriminative and multi-scale filter bank tangent space mapping algorithm is proposed in this article to design the subject-specific Filter Bank so as to effectively recognize multiclass MI tasks. Methods: On the 4-class BCI competition IV-2a dataset, first, a non-parametric method of multivariate analysis of variance based on the sum of squared distances is used to select discriminative frequency bands for a subject; next, a multi-scale FB is generated according to the range of these frequency bands, and then decompose multi-channel EEG of the subject into multiple sub-bands combined with several time windows. Then TSM algorithm is used to estimate Riemannian tangent space features in each sub-band and finally a liner Support Vector Machines is used for classification. Main Results: The analysis results show that the proposed discriminative FB enhances the multi-scale TSM algorithm, improves the classification accuracy and reduces the execution time during training and testing. On the 4-class BCI competition IV-2a dataset, the average session to session classification accuracy of nine subjects reached 77.33 ± 12.3%. When the training time and the test time are similar, the average classification accuracy is 2.56% higher than the latest TSM method based on multi-scale filter bank analysis technology. When the classification accuracy is similar, the training speed is increased by more than three times, and the test speed is increased two times more. Compared with Supervised Fisher Geodesic Minimum Distance to the Mean, another new variant based on Riemann geometry classifier, the average accuracy is 3.36% higher, we also compared with the latest Deep Learning method, and the average accuracy of 10-fold cross validation improved by 2.58%. Conclusion: Research shows that the proposed DMFBTSM algorithm can improve the classification accuracy of MI tasks. Significance: Compared with the MFBTSM algorithm, the algorithm proposed in this article is expected to select frequency bands with good separability for specific subject to improve the classification accuracy of multiclass MI tasks and reduce the feature dimension to reduce training time and testing time. (shrink)

Scientific papers written as dialogues evoke Platonist philosophical discourses and are foreseen as elementary forms of expression in neoclassical scientific renaissance. Here we report on a study of the Brazil nut effect in a series of macroscopic and microscopic systems in the form of a play in three acts. The nut effect predicting the segregation of smaller grains at the bottom of the mixture and larger ones at the top was observed in a polydisperse mix of manually shaken playground pebbles, (...) albeit following different kinetics than in an agitated pile of chess pieces. Common sense predicts that vertical, gravity-driven segregation in colloidal dispersions with heterogeneous particle size distributions is such that larger particles would settle toward the bottom and the lighter ones cream at the top. Here we refute this expectation and demonstrate that segregation of colloidal particles in the vertical direction conforms to the Brazil nut effect when the agitation is delivered in the forms of vortex mixing or audio vibration, but not when the colloids are manually shaken. The effect is demonstrated on aqueous dispersions of hydroxyapatite and iron oxide nanoparticles. Kinetic experiments showed that segregation increases with the agitation time in mixtures of pebbles and with the post-agitation aging time in fine particle colloids. The particle size gradient established due to agitation-induced segregation led to a corresponding gradient in optoelectronic properties—band gap, conductivity, lattice acoustics—in the vertical direction of the colloidal column for both types of nanoparticles. Such morphological gradients induced by the Brazil nut effect can be harnessed as affordable and facile templates for the synthesis of functionally gradient materials. Discussion of the mechanism and the application potential of the observed effect in colloidal and coarse systems is enriched with a literature review of this curious effect and entwined with the literary elements of the dramaturgical narrative involving a family of scientist in exile from mainstream scientific institutions: the mother, the father, an elementary school boy and a kindergarten girl. The narrative conforms in its structure to the shape of a Brazil nut and presents the first research study whose findings are enacted through a dream. The play questions the humaneness and creative prospects of modern science and celebrates children’s science projects performed with meager resources and a plentiful of imagination, showing that they could be gateways to important scientific discoveries. (shrink)

A new medical image enhancement algorithm based on spatial frequency domain is presented in this article. The medical image is first divided into several sub-images based on dyadic wavelet scale analysis. At each level, different directional sub-band images can reflect the different characteristics of the image. A low-frequency sub-band image maintains the original image content information, and high-frequency sub-band images represent image details such as edges and regional boundaries. The corresponding sub-band images are then enhanced by (...) different Butterworth homomorphic filtering functions, which can attenuate the low frequencies and amplify the high frequencies. A linear adjustment is carried out on the low frequency of the highest level. Then, the wavelet reconstruction course is used to obtain the final enhanced image. Experiments on magnetic resonance images of temporomandibular joint soft tissues have shown that the proposed method can effectively eliminate the non-uniform luminance distribution of medical images. Its performance is much better than traditional Butterworth homomorphic filtering algorithm whether in subjective vision quality or objective evaluations such as detailed information entropy and average gradient. (shrink)

Kierkegaard’s Works of Love has often been accused of being unable to deal adequately with ‘special relationships’. This debate has re-emerged in a fresh form in a recent disagreement in the secondary literature between M. Jamie Ferreira and Sharon Krishek. Krishek charges Ferreira with failing to acknowledge some important conflicts in Kierkegaard’s account of preferential love. In this article, I argue that some key passages are indeed insufficiently addressed in Ferreira’s account. Yet ultimately, I argue, Krishek ends up condemning the (...) Kierkegaard of Works of Love unfairly. As a solution to Krishek’s concerns, I present a defence of Kierkegaard’s position centred round the image of God as a ‘filter’ through which our loves must pass. Also, while acknowledging that Krishek raises some important questions for Ferreira’s account, I outline a possible response, based in part on Kierkegaard’s idea that neighbour love is only a ‘sketch’ until brought to fruition in any given manifestation of concrete love. Ultimately, I claim, Kierkegaard’s position in Works of Love can indeed be defended from Krishek’s critique. (shrink)

We found that phase cone clustering patterns in EEG ripple bands demonstrate an increased turnover rate in epileptogenic zones compared to adjacent regions. We employed 256 channel EEG data collected in four adult subjects with refractory epilepsy. The analysis was performed in the 80–150 and 150–250 Hz ranges. Ictal onsets were documented with intracranial EEG recordings. Interictal scalp recordings, free of epileptiform patterns, of 240-s duration, were selected for analysis for each subject. The data was filtered, and the instantaneous phase (...) was extracted after the Hilbert transformation. Spatiotemporal contour plots of the unwrapped instantaneous phase with 1.0 ms intervals were constructed using a montage layout of the 256 electrode positions. Stable phase cone patterns were selected based on criteria that the sign of spatial gradient did not change for a minimum of three consecutive time samples and the frame velocity was consistent with known propagation velocities of cortical axons. These plots exhibited increased dynamical formation and dissolution of phase cones in the ictal onset zones, compared to surrounding cortical regions, in all four patients. We believe that these findings represent markers of abnormally increased cortical excitability. They are potential tools that may assist in localizing the epileptogenic zone. (shrink)

Prior to this intervention the site used to be a degraded fiscal property, that functioned as a bus yard, a police legal deposit, and a restaurant parking lot. Underneath it runs the Maldonado stream culvert, covered by a concrete slab at a depth of only -20cm. Next to the site is a 5m high railroad embankment. The plot is strategically located at the end of Juan B. Justo avenue and works as a gateway to the Tres de Febrero park (also (...) known as Bosques de Palermo, the Buenos Aires’s biggest green space designed by Charles Thays in 1875). It is situated in the neighborhood of Palermo, an area that underwent a vertiginous residential and commercial expansion since the late 90´s. -/- The design approach is influenced by the adjacent urban fragments: the grounds of the Sociedad Rural Argentina, the surrounding Avenues Santa Fe-Sarmiento; the opening of Darregueyra street expected for the near future, the implementation of historic preservation guidelines for the Tres de Febrero Park, and the proposal for the development of nearby railroad yards. -/- Specifically, the project seeks to minimize the impact of the fast traffic that runs along Bullrich avenue, improving pedestrian and cycle access to the park. At the same time it defines new landscape features, utilizing the earth made available by the tunneling works of a new subway line. -/- The project comprises the structuring of an existing 800 meter long embankment and the transformation of the sidewalk into a public promenade. This is achieved through a wider sidewalk of 12m on average, which is part of a series of longitudinal stripes ranging from high speed to quiet spaces. The first band of grass and aged tipas (tipuana tipu) buffer pedestrian and cyclist from automotive traffic. Cycle traffic is organized on its own lane. The sidewalk itself contains several bays that act as urban lounges. Next, a continuous concrete bench delimits the beginning of the slope, backed by a stripe of grass that works as a soft extension. Finally, plants for contemplation are arranged as undulating traces. Rhythmic use of retaining gabions defines longitudinal segments of varying slope, unifying the spacial criterion. This series is punctuated by an amphitheater and framed by triangular plazas at the corners. -/- Material choices for hard surfaces are constrained by concerns of durability, low cost, and consistency with other ongoing public works. -/- Hard materials, as well as the plant selection needed to be low-maintenance. The palette was kept to reinforced concrete, granitic slabs, and granite stone in large size –forming retaining gabions- and as loose finishing for pavements. Likewise, the lack of a protective enclosure and of continuous surveillance dictated that urban furniture and fixtures be anti-vandalic. The stealing of these components –from inspection lids, to benches, to plants- is a common problem in urban spaces in many Latin American cities. To prevent this, fixtures must be designed according to precise specifications regarding their weight, fixing and anchoring systems, and mechanical parts. -/- Sidewalks are organized through a 6 meter grid made of granitic white slab, infilled with textured combed nonslip concrete modules. Extended bays and corner squares are finished with white and black slabs respectively. These materials are similar to another used in public spaces under construction, in the believe that it creates a collective identification of themselves along the city. -/- The continuous reinforced concrete bench is 1.10 m wide, in order to allow people to use it in non-conventional ways. Further up on the slope, undulating paths separate plant species and provide access for gardening, but are also open to use by the public. They are paved with 2 meter-long precast concrete slabs (smaller and lighter pieces were avoided to deter robbery). As they reach the gabions they connect with sloping paths covered with loose granitic stones. The gabions themselves allow the creation of varying slopes while contributing to retaining the soil, which is reinforced with geosynthetic fabric in the perimeter to avoid landslides originated by strong rains typical of the region. -/- Urban furniture is featured on the wider bays of the sidewalk and at corner plazas. It includes seats, water fountains, bicycle racks, wastepaper baskets. As a counterpoint to the linear concrete bench, groups of concrete seats are arranged informally. These seats are a reinterpretation of the dynamic BKF chair (also known as Butterfly chair), the classic Argentinean design of the 1930’ by Antonio Bonet, Juan Kurchan, and Jorge Ferrari-Hardoy. A few low concrete tables complete these spaces as authentic urban lounges. Lighting design accompanies the general features of the project and creates a new scenography emphasizing night-time usage. -/- Landscape gardening criteria is set up by a selection of various species of high-resistant pasture (grass). The higher the slope, the higher the grass, increasing the final volumetric result. Based on considering the original tipas line (tipuana tipu, a species from the north of Argentina, yellow flowering) as a vertical wall that frames the view, the horizontal stripes contain a single species each, differing in size, shade and flowering periods –adding, in the middle band, a changing color on the big green plane slope in the same chromatic range. The final configuration of the stripe sequence from bottom to top: bermuda grass, bulbine frutescens, euryops pectinatus. The upper band existing native species is reinforced with new samples: paspalum exaltatum + cortadera selloana and ipomea + thumbergia climbing the railway fence. Each sector between gabions has an automated system of drip irrigation. Near the corner plazas, several palms are planted to provide shade and identity to the street-crossing. -/- The intervention proposes an ambivalent effect on the landscape, trascending the merely ornamental by accompanying the motorist in speed, while conforting the pedestrian with spaces for contemplation and urban relax. (shrink)

The ongoing legal and bioethics debates on consent requirements for collecting, storing, and utilizing human biological material for purposes of basic and applied research—that is, genomic research biobanking—have already managed to pass through three ostensibly dissimilar stages.

In lieu of an abstract, here is a brief excerpt of the content:MIMETIC VIOLENCE AND NELLA LARSEN'S PASSING: TOWARD A CRITICAL CONSCIOUSNESS OF RACISM Martha Reineke University ofNorthern Iowa In her recent essay, "Working through Racism: Confronting the Strangely Familiar," Patricia Elliot proposes that members of dominant groups who want to contest racism1 not only challenge economic, political, and social processes within society that produce racism, but also address personal claims they make on institutional structures which help to maintain it (...) (63). Sympathetic with an anti-racist strategy that concerns itself not only with racism at the institutional level but also with racism on a more intimate scale, Elliot nevertheless laments that individual complicity in racism is frequently attributed to aproblematic attitude. As a consequence, anti-racist work among members of dominant groups often is arrayed along a narrow spectrum: in workshops or in-service seminars participants attempt to identify and acknowledge biased and discriminatory views. Elliot fears that consciousness-raising efforts ofthis kind are unlikely to effect social change ifthose who participate continue to favor the confessional stance. Urging her readers to develop a "critical consciousness," a concept she takes from bell hooks (hooks 118), Elliot asks that members ofdominant groups who desire to promote social change not only combat institutional racism, but also divest themselves oisubjective investments in racism (63). Only as persons commit 1 Racism "involves the subordination ofpeople ofcolor by white people" (Rothenberg 6). Marked by discrimination and prejudice, racism entails also the exercise ofpower (conscious and unconscious, intentional and unintentional) by which white people maintain positions of privilege over persons ofcolor (Rothenberg 7). Martha Reineke75 themselves to a sophisticated and nuanced analysis of white complicity in structures of domination in order to grapple with racism at multiple levels—includingidentityformation, maintenance, and transformation—can members ofdominant groups actually tackle and begin to dismantle it (Elliot 63). Elliot's call to critical consciousness is laudable, but the goal she sets forth is not easily attained. As 1 struggle to achieve hook's critical consciousness of racism, like Elliot (64), I find difficult the task ofexploring the construction ofmy own identity as a white academic.2 For example, when I discuss issues in women's lives in the classroom or at professional conferences, I not infrequently am challenged by women of color who note that unexamined privilege (race and class) skews my perspective.3 1 also find myselfspeaking for others, assuming their voices, when I should speak only for myself. As a consequence, I regularly have cause to ponder whether, under the guise of contributing to anti-racistwork, I am appropriating others' voices in ways that reinforce racism rather than challenge it. For instance, on what grounds do I, a white woman, in this essay propose to address the problem of racism by reflecting on a novella written by an African-American woman? Does white privilege foreground my choice, precluding me from reading a work of literature in ways that might challenge rather than further racism? Grappling with these issues while reflecting on the theme of a critical consciousness ofracism, I find instructive the Girardian notion of mimesis. The dynamics of mimesis account well for agents of racism who, simultaneously recognizing and denying difference, act in ways that inhibit social and subjective transformation. Were members ofdominant groups to 2 Ofcourse, a professional affiliation is only one facet ofone's identity. I focus on that facet here because, through conversations with students about literature, I seek to contribute to antiracist work. 3Recent publications record similar conversations among women ofcolor and white women about white privilege. In White Women, RaceMatters: The Social Construction ofWhiteness, Ruth Frankenberg offers an ethnographic analysis ofthe dynamics ofprivilege in white women's lives. In The Color ofPrivilege: Three Blasphemies on Race andFeminism, Aída Hurtado offers a reflexive theory ofgender subordination which focuses on unwritten rules, inclusive of daily practices and psychological processes, that maintain power for whites as a group. Contributors to Who Can Speak? Authority and Critical Identity consider the ethics and political legitimacy ofspeaking as someone (e.g., a speaker identifies herselfas white, middleclass, and heterosexual before offering her views) oxfor someone (e.g., a white Canadian author writes first person accounts ofthe lives ofNative Canadian women but stops when a group of... (shrink)

A defendant’s failure to show remorse is one of the most powerful factors in criminal sentencing, including capital sentencing. Yet there is currently no evidence that remorse can be accurately evaluated in a courtroom. Conversely there is evidence that race and other impermissible factors create hurdles to evaluating remorse. There is thus an urgent need for studies about whether and how remorse can be accurately evaluated. Moreover, there is little evidence that remorse is correlated with future law-abiding behavior or other (...) legitimate penal purposes, and, in fact, there is evidence that remorse is often conflated with shame, which is correlated with increased future criminality. More accurate information on the nature and evaluation of remorse can be used to reform the criminal justice system. (shrink)

A common approach to quantum physics is enshrouded in a jargon which treats state vectors as attributes of physical systems and the concept of state preparation as a filtration scheme wherein a process involving measurement selects from a primordial assembly of systems those bearing some prescribed vector of interest. By contrast, the empirical experiences with which quantum theory is actually concerned relate measurement and preparation in quite an opposite manner. Reproducible preparation schemes are logically and temporally anterior to measurement acts. (...) Measurement extracts numbers from systems prepared in a specified manner; these data are then regularized by the theory by means of a state concept which is in turn used to characterize succinctly the given mode of preparation. The present paper offers, in a simple spin model, a method for determining the quantum state that represents any reproducible preparation. (shrink)

When the state of a physical system is not fully determined by available data, it should be possible nevertheless to make a systematic guess concerning the unknown state by applying the principles of information theory. The resulting theoretical blend of informational and mechanical constructs should then constitute a modern structure for statistical physics. Such a program has been attempted by a number of authors, most notably Jaynes, with seeming success. However, we demonstrated in a recent publication that the standard list (...) of so-called “mutually exclusive and exhaustive” quantum states that is commonly employed by these authors is in fact not exhaustive. It follows that the information-theoretic foundations of quantum statistics must be reformulated. The present paper discusses the fundamental problems involved and establishes a format for the correct application of information theory to quantum mechanical situations. (shrink)

A theorem is derived that enables a systematic enumeration of all the linear superoperators ℒ (associated with a two-level quantum system) that generate, via the law of motion ℒρ= $\dot \rho$ , mappings ρ(0) → ρ(t) restricted to the domain of statistical operators. Such dynamical evolutions include the usual Hamiltonian motion as a special case, but they also encompass more general motions, which are noncyclic and feature a destination state ρ(t → ∞) that is in some cases independent of ρ(0).

Agedanken electromagnetic device is described which permits the transfer of information at speeds faster than light without violating the principle of causality.

When quantum scattering theory is applied strictly from the point of view that the state of a system is completely described by the density matrix, whether pure or mixed, it is not possible to assume that colliding particles are at all times individually in pure states. Exact results are significantly different from conventionally accepted approximations. In particular, it turns out that the cross section as ordinarily defined in theS-matrix formalism is an adequate parameter for deciding the outcome of interactions only (...) when the particles are carefully prepared in matching pure states. In general the use of the cross section in studying pair collisions in a real gas is shown to be analogous to a repeated “collapse of the wave function” after each collision, and involves arbitrary removal of nondiagonal elements of the density matrix, thus violating the basic laws of quantum dynamical evolution. (shrink)

Research on salesperson creativity remains as one of the most under-researched topics in the sales literature despite the evidence that encouraging creativity in the sales domain is a source of competitive advantage. This paper aims to fill this research gap by exploring the influence of perceived ethical climate on salesperson creative performance, paying special attention to the role that emotions play in this process. Data provided by 176 supervisor–salesperson dyads confirm that the trust/responsibility dimension of an ethical climate is positively (...) related to salesperson creative selling by increasing salespeople's organizational pride. Similarly, the perception of unethical selling practices negatively affects salesperson organizational pride, reducing the expression of creative behaviors. Moreover, the negative effect of unethical selling practices on creative performance is stronger (more negative) when salespeople's identification with an organization increases. Managerial implications and future research directions are also addressed. (shrink)