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Chinese Physics B 2004年第6期13卷 789-793页

作者：周艳 k.w.whang J.H.Yang D.C.Jeong C.H.Ha Y.w.Choi SchoolofOptoelectronicInformation UniversityofElectronicScienceandTechnologyofChinaChengdu610054China SchoolofElectricalEngineering SeoulNationalUniversitySan56-1Shinlim-dongKwanak-guSeoul151-742Korea koreaElectrotechnologyResearchInstitute Changwon641-600Korea

The electric field in a surface discharge type ac-PDP cell with He or He/Xe(0.1%) mixture has been measured over a wide range of pressure (5 50kP1 using laser induced fluorescence detection. The wall voltage was estimated from the measured electric field. The Stark manifolds of triplet atomic helium Rydberg state (2s3S) with principal quantum numbers (n=8 and 9) have been used to measure the electric field, as the lifetime of 2s3S is longer than the single atomic helium Rydberg state (2s1S) in high pressure discharge. Comparison of the Stark manifolds between the n=9 and n=8shows that the measurement accuracy of electric field can be increased by 10%. The maximum electric field strength during discharge and the wall voltage at the end of pulse decreases with the increase of pressure. The comparison of He and He/Xe(0.1%) discharge at 13kPa showed that He/Xe gas mixture discharge can accumulate more wall charge on MgO surface and the electric field was somewhat higher than those of pure helium discharge during pulse off period under the same discharge conditions.

关键词： plasma display panel laser induced fluorescence electric field measurement

Two sides of the heliopause

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Science China Earth Sciences 2011年第12期54卷 1830-1844页

作者： whang Y. C Catholic University of America

Interaction of the solar wind with the interstellar medium leads to the formation of the heliosphere and termination shock. This article addresses three aspects of the plasma and magnetic field on two sides of the heliopause：（1） The interstellar magnetic field surrounding the heliopause. In the limit of very low plasma β-ratio an analytical solution is obtained for the 3D interstellar magnetic field by means of a line dipole method. The undisturbed magnetic field in the upstream is allowed to have an arbitrary inclination angle. The solution describes the heliosphere as having a blunt-nosed geometry on the upwind side and approaching a cylindrical geometry on the downwind side. The distortion of the magnetic field can penetrate very deep into the interstellar space. （2） Interaction of the interstellar neutral hydrogen with the global solar wind. The ionization process leads to removal of interstellar neutral hydrogen in the heliosphere： on the upwind side, 90% of hydrogen depletion occurs inside 60 AU, the hydrogen density changes rapidly inside 10 AU. A hydrogen cavity forms inside -4 AU; the cavity extends on the downwind side to form a long cavity wake. Outside the cavity and cavity wake, pickup protons are produced, they cause deceleration and heating of the solar wind. The wind speed and temperature also increase steadily with heliolatitude caused by the latitudinal increase in wind speed at the inner boundary. （3） The global geometry of the termination shock. The termination shock has been treated as having a closed geometry in previous heliosphere models. This study presents a new perspective that the global termination shock may have a bow-shaped open geometry. The termination shock forms on the upwind side because the forward motion of the supersonic solar wind is blocked at the blunt-nosed heliopause. However, the heliopause likely to be open on the downwind side; the motion of the supersonic solar wind is unobstructed for shock formation. Thus, the globa

关键词： solar wind interstellar medium magnetic fields plasmas magnetohydrodynamics (MHD)

A novel method for clustering cellular data to improve classification

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Neural Regeneration Research 2025年第9期20卷 2697-2705页

作者： Diek w.wheeler Giorgio A.Ascoli Center for Neural Informatics Structures&PlasticityKrasnow Institute for Advanced Study Bioengineering Department Volgenau School of Engineering George Mason University FairfaxVAUSA

Many fields,such as neuroscience,are experiencing the vast prolife ration of cellular data,underscoring the need fo r organizing and interpreting large datasets.A popular approach partitions data into manageable subsets via hierarchical clustering,but objective methods to determine the appropriate classification granularity are *** recently introduced a technique to systematically identify when to stop subdividing clusters based on the fundamental principle that cells must differ more between than within *** we present the corresponding protocol to classify cellular datasets by combining datadriven unsupervised hierarchical clustering with statistical *** general-purpose functions are applicable to any cellular dataset that can be organized as two-dimensional matrices of numerical values,including molecula r,physiological,and anatomical *** demonstrate the protocol using cellular data from the Janelia MouseLight project to chara cterize morphological aspects of neurons.

关键词： cellular data clustering dendrogram data classification Levene's one-tailed statistical test unsupervised hierarchical clustering

Genistein:a possible solution for the treatment of Alzheimer’s disease

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Neural Regeneration Research 2025年第10期20卷 2903-2905页

作者： karolina Pierzynowska Bartosz karaszewski Grzegorz węgrzyn Department of Molecular Biology University of GdanskGdanskPoland Gdansk Polandand Department of Adult NeurologyFaculty of MedicineMedical University of GdanskGdanskPoland

Neurodegenerative diseases are defined as disorders resulting from the slow and progressive loss of function and eventual death of neural cells that result from the primary pathology of nervous *** can lead to severe nervous system dysfunction,eventually affecting multiple organs and *** hundred neurodegenerative diseases have been described,and owing to their prevalence,severity.

关键词： organs Alzheimer death

Regression analysis of squeezing-induced hybrid nanofluid flow in Darcy-Forchheimer porous medium

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 193-208页

作者： k.MUHAMMAD M.SARFRAZ Department of Humanities and Sciences School of Electrical Engineering and Computer Science National University of Sciences and Technology Department of Mathematics Quaid-i-Azam University

This article presents a mathematical model addressing a scenario involving a hybrid nanofluid flow between two infinite parallel plates. One plate remains stationary, while the other moves downward at a squeezing velocity. The space between these plates contains a Darcy-Forchheimer porous medium. A mixture of water-based fluid with gold(Au) and silicon dioxide(Si O2) nanoparticles is formulated. In contrast to the conventional Fourier's heat flux equation, this study employs the Cattaneo-Christov heat flux equation. A uniform magnetic field is applied perpendicular to the flow direction, invoking magnetohydrodynamic(MHD) effects. Further, the model accounts for Joule heating, which is the heat generated when an electric current passes through the fluid. The problem is solved via NDSolve in MATHEMATICA. Numerical and statistical analyses are conducted to provide insights into the behavior of the nanomaterials between the parallel plates with respect to the flow, energy transport, and skin *** findings of this study have potential applications in enhancing cooling systems and optimizing thermal management strategies. It is observed that the squeezing motion generates additional pressure gradients within the fluid, which enhances the flow rate but reduces the frictional drag. Consequently, the fluid is pushed more vigorously between the plates, increasing the flow velocity. As the fluid experiences higher flow rates due to the increased squeezing effect, it spends less time in the region between the plates. The thermal relaxation, however, abruptly changes the temperature, leading to a decrease in the temperature fluctuations.

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Empathic Responses of Behavioral-Synchronization in Human-Agent Interaction

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Computers, Materials & Continua 2022年第5期71卷 3761-3784页

作者： Sung Park Seongeon Park Mincheol whang Savannah College of Art and Design SavannahGA31401USA Sangmyung University Seoul03016Korea

Artificial entities,such as virtual agents,have become more *** long-term presence among humans requires the virtual agent’s ability to express appropriate emotions to elicit the necessary empathy from the *** empathy involves behavioral mimicry,a synchronized co-movement between dyadic ***,the characteristics of such synchrony between humans and virtual agents remain unclear in empathic *** study evaluates the participant’s behavioral synchronization when a virtual agent exhibits an emotional expression congruent with the emotional context through facial expressions,behavioral gestures,and *** viewed an emotion-eliciting video stimulus(negative or positive)with a virtual *** participants then conversed with the virtual agent about the video,such as how the participant felt about the *** virtual agent expressed emotions congruent with the video or neutral emotion during the *** participants’facial expressions,such as the facial expressive intensity and facial muscle movement,were measured during the dialog using a *** results showed the participants’significant behavioral synchronization(i.e.,cosine similarity≥.05)in both the negative and positive emotion conditions,evident in the participant’s facial mimicry with the virtual ***,the participants’facial expressions,both movement and intensity,were significantly stronger in the emotional virtual agent than in the neutral virtual *** particular,we found that the facial muscle intensity of AU45(Blink)is an effective index to assess the participant’s synchronization that differs by the individual’s empathic capability(low,mid,high).Based on the results,we suggest an appraisal criterion to provide empirical conditions to validate empathic interaction based on the facial expression measures.

关键词： Facial emotion recognition facial expression virtual agent virtual human embodied conversational agent empathy human-computer interaction

Glia-to-neuron reprogramming to the rescue?

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Neural Regeneration Research 2025年第5期20卷 1395-1396页

作者： Jack w.Hickmott Cindi M.Morshead Department of Surgery University of TorontoTorontoONCanada Donnelly Centre for Cellular and Biomolecular Research TorontoONCanada Institute of Biomedical Engineering University of TorontoTorontoONCanada The kITE Research Institute Toronto Rehabilitation InstituteUniversity Health NetworkTorontoONCanada

Over the last two decades,the dogma that cell fate is immutable has been increasingly challenged,with important implications for regenerative *** brea kth rough discovery that induced pluripotent stem cells could be generated from adult mouse fibroblasts is powerful proof that cell fate can be *** exciting extension of the discovery of cell fate impermanence is the direct cellular reprogram ming hypothesis-that terminally differentiated cells can be reprogrammed into other adult cell fates without first passing through a stem cell state.

关键词： programming passing proof

Natural orifice transluminal endoscopic surgery:where are we going?

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world Journal of Gastroenterology 2010年第35期16卷 4371-4373页

作者： Susan H whang klaus Thaler Virginia Mason Medical Center Hudson Valley Hospital Center Cortlandt Manor

The foundation for natural orifice transluminal endoscopic surgery(NOTES) is to access the peritoneal and other body cavities through the wall of the alimentary tract via natural orifices,with the goal of performing procedures within the peritoneum and other cavities,without the need to make incisions in the abdominal *** have made great progress in the field of NOTES since the publication of the white Paper in *** are still major fundamental goals as outlined by the Society of American Gastrointestinal and Endoscopic Surgeons/American Society for Gastrointestinal Endoscopy joint committee that need to be evaluated and answered before NOTES is ready for widespread clinical *** include prevention of infection,instrument development,creation of a multitasking platform,and the ability to recognize and treat intraperitoneal complications such as hemorrhage and other physiological adverse *** response to this need,recent abstracts and papers have focused on the management of intraoperative *** next phase is to focus on controlled prospective multicenter clinical trials that compare defined NOTES procedure to standard *** goal is to produce reliable and convincing data for the United States Food and Drug Administration,insurance companies,the physician community and the general *** the present time,we still have many important milestones that still need to be *** investigators agree that a hybrid technique and not a pure NOTES practice should be advocated until devices can meet the current and new challenges in this f ield.

关键词： Natural orif ice transluminal endoscopic surgery Endoscopic surgery Gastrointestinal surgery Laparoscopy

Exploring the relationship-oriented spaces of social networks and depressive symptoms among older adults

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Frontiers of Architectural Research 2024年第1期13卷 112-126页

作者： Yongming Yang Heejoon whang Department of Architecture Hanyang UniversitySeoul 04763Republic of Korea

The Republic of korea has the highest suicide rate of older population among OECD countries,and depression is the prevailing *** it is well-known that the urban physical environment affects mental health,research on the physical characteristics of spaces remains *** study aims to explore relationship-oriented space characteristics that can form social networks and reduce depressive symptoms in older *** analyzing the differences in social interaction spaces between high-density and low-density areas for older adults in Seoul,we identified social interaction spaces(parks and traditional markets)that are frequently used based on on-site interview *** areas were selected for the questionnaire *** main findings revealed that older adults living in areas with diverse spatial planning and close physical relationships between parks and traditional markets,convenient pedestrian environments,and lower population density of older adults had better social networks and lower depressive *** significantly,the physical characteristics of parks and traditional markets(convenient accessibility,maximized visibility,connectivity,and territoriality)significantly facilitate social *** engaging in social interactions within these spaces exhibited significantly better social networks and lower depressive *** findings underscore the importance of considering relationship-oriented space characteristics in spatial and urban planning.

关键词： Relationship-oriented spaces Social networks Depressive symptoms High-density areas Older adults

Image-Based Lifelogging: User Emotion Perspective

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Computers, Materials & Continua 2021年第5期67卷 1963-1977页

作者： Junghyun Bum Hyunseung Choo Joyce Jiyoung whang College of Computing Sungkyunkwan UniversitySuwon16417Korea School of Computing KAISTDaejeon34141Korea

Lifelog is a digital record of an individual’s daily *** collects,records,and archives a large amount of unstructured data;therefore,techniques are required to organize and summarize those data for easy *** has been utilized for diverse applications including healthcare,self-tracking,and entertainment,among *** regard to the imagebased lifelogging,even though most users prefer to present photos with facial expressions that allow us to infer their emotions,there have been few studies on lifelogging techniques that focus upon users’*** this paper,we develop a system that extracts users’own photos from their smartphones and congures their lifelogs with a focus on their *** design an emotion classier based on convolutional neural networks(CNN)to predict the users’*** train the model,we create a new dataset by collecting facial images from the CelebFaces Attributes(CelebA)dataset and labeling their facial emotion expressions,and by integrating parts of the Radboud Faces Database(RaFD).Our dataset consists of 4,715 high-resolution *** propose Representative Emotional Data Extraction Scheme(REDES)to select representative photos based on inferring users’emotions from their facial *** addition,we develop a system that allows users to easily congure diaries for a special day and summaize their *** experimental results show that our method is able to effectively incorporate emotions into lifelog,allowing an enriched experience.

关键词： Lifelog facial expression emotion emotion classier transfer learning