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2-D eddy resolving simulations of flow past a circular array of cylindrical plant stems

Journal of Hydrodynamics 2018年第2期30卷 317-335页

作者： Kyoungsik Chang George Constantinescu sanghyun park School of Mechanical Engineering Ulsan University Ulsan Korea Civil and Environmental Engineering Department IIHR-Hydroscience and Engineering Stanley Hydraulics Laboratory The University of Iowa Iowa City USA Korea Aerospace Research Institute Daejeon Korea

In the present study, 2-D large eddy simulations（LES） are conducted for flow past a porous circular array with a solid volume fraction（SVF） of 8.8%, 15.4% and 21.5%. Such simulations are relevant to understanding flow in natural streams and channels containing patches of emerged vegetation. In the simulations discussed in the paper, the porous cylinder of diameter D contains a variable number of identical solid circular cylinders（rigid plant stems） of diameter d= 0.048 D. Most of the simulations are conducted at a Reynolds number of 2 100 based on the diameter D and the velocity of the steady uniform incoming flow. Though in all cases wake billows are shed in the regions where the separated shear layers（SSLs） forming on the sides of the porous cylinder interact, the effect of these wake billows on the mean drag is different. While in the high SVF case（21.5%）, the total drag force oscillates quasi-regularly in time, similar to the canonical case of a large solid cylinder, in the cases with a lower SVF the shedding of the wake billows takes place sufficiently far from the cylinder such that the unsteady component of the total drag force is negligible. The mean amplitude of the oscillations of the drag force on the individual cylinders is the largest in a streamwise band centered around the center of the porous cylinder, where the wake to wake interactions are the strongest. In all cases the maximum drag force on the individual cylinders is the largest for the cylinders directly exposed to the flow, but this force is always smaller than the one induced on a small isolated cylinder and the average magnitude of the force on the cylinders directly exposed to the flow decreases monotonically with the increase in the SVF. Predictions of the global drag coefficients, Strouhal numbers associated with the wake vortex shedding and individual forces on the cylinders in the array from the present LES are in very good agreement with those of 2-D direct numerical simulations conduc

关键词： Vegetation eddy resolving simulation solid volume fraction porous cylinder bleeding flow

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CORE:Common Region Extension Based Multiple Protein Structure Alignment for Producing Multiple Solution

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Journal of Computer Science & Technology 2013年第4期28卷 647-656页

作者： Woo-Cheol Kim sanghyun park Jung-Im Won College of Information Sciences and Technology The Pennsylvania State University University Park Department of Computer Science Yonsei University Research Center of Information and Electronic Engineering Hallym University Chuncheon

Over the past several decades, biologists have conducted numerous studies examining both general and specific functions of proteins. Generally, if similarities in either the structure or sequence of amino acids exist for two proteins, then a common biological function is expected. Protein function is determined primarily based on the structure rather than the sequence of amino acids. The algorithm for protein structure alignment is an essential tool for the research. The quality of the algorithm depends on the quality of the similarity measure that is used, and the similarity measure is an objective function used to determine the best alignment because of their individual strength and weakness However, none of existing similarity measures became golden standard They require excessive filtering to find a single alignment. In this paper, we introduce a new strategy that finds not a single alignment, but multiple alignments with different lengths. This method has obvious benefits of high quality alignment. However, this novel method leads to a new problem that the running time for this method is considerably longer than that for methods that find only a single alignment. To address this problem~ we propose algorithms that can locate a common region （CORE） of multiple alignment candidates, and can then extend the CORE into multiple alignments. Because the CORE can be defined from a final alignment, we introduce CORE＊ that is similar to CORE and propose an algorithm to identify the CORE＊. By adopting CORE＊ and dynamic programming, our proposed method produces multiple alignments of various lengths with higher accuracy than previous methods. In the experiments, the alignments identified by our algorithm are longer than those obtained by TM-align by 17% and 15.48%, on average, when the comparison is conducted at the level of super-family and fold, respectively.

关键词： structure alignment similarity search protein structure

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Recent trends in the epidemiology and clinical outcomes of inflammatory bowel disease in South Korea,2010-2018

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World Journal of Gastroenterology 2024年第9期30卷 1154-1163页

作者： Seulji Kim Hyun Jung Lee Seung Woo Lee sanghyun park Seong-Joon Koh Jong Pil Im Byeong Gwan Kim Kyung-Do Han Joo Sung Kim Department of Internal Medicine Korea Institute of Radiological and Medical SciencesSeoul 01812South Korea Department of Internal Medicine and Liver Research Institute Seoul National University College of MedicineSeoul 03080South Korea Department of Statistics and Actuarial Science Soongsil UniversitySeoul 06978South Korea

BACKGROUND Inflammatory bowel disease(IBD)was previously regarded as a Western disease;however,its incidence is increasing in the *** epidemiology of IBD in Asia differs significantly from the patterns in the *** To comprehensively investigate the epidemiology of IBD in South Korea,inclu-ding its incidence,prevalence,medication trends,and *** We analyzed claims data from the Health Insurance Review and Assessment Service and Rare and Intractable Diseases(RIDs),operated by the National Health Insurance Service of South *** with IBD were identified based on the International Classification of Diseases,Tenth Revision,and RID diagnostic codes for Crohn’s disease(CD)and ulcerative colitis(UC)from 2010 to *** In total,14498 and 31409 patients were newly diagnosed with CD and UC,respectively,between 2010 and *** annual average incidence of CD was 3.11 cases per 105 person-years,and that of UC was 6.74 cases per 10^(5) *** 2014,the incidence rate of CD has been stable,while that of UC has steadily increased,shifting the peak age group from 50-year-olds in 2010 to 20-year-olds in *** CD and UC prevalence increased consistently over the study period;the use of 5-aminosali-cylates and corticosteroids gradually decreased,while that of immunomodulators and biologics steadily increased in both CD and *** clinical outcomes of IBD,such as hospitalization and surgery,decreased during the study *** The CD incidence has been stable since 2014,but that of UC has increased with a shift to a younger age at peak incidence between 2010 and *** clinical outcomes improved over time,with increased use of immunomodu-lators and biologics.

关键词： Inflammatory bowel disease Crohn’s disease Ulcerative colitis Incidence Prevalence

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Euonymus alatus prevents a high fat diet-induced hyperglycemia and hyperlipidemia

Euonymus alatus prevents a high fat diet-induced hyperglycem...

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第十五届国际药理学大会

作者： park sanghyun Hong Jongki Chung Sunghyun College of Phar macy Kyunghee University Seoul 130-701Korea College of Phar macy Kyunghee University Seoul 130-701Korea College of Phar macy Kyunghee University Seoul 130-701Korea

＜正＞ This study investigated the preventive effect of Euonymus alatus （EA） ethanol extract on high fat diet - induced hyperglycemia and hyperlipidemia. ICR mice were randomly divided into five groups: control mice were to receive either a regular diet （RD） or high - fat diet （HFD）. and treatment groups were fed a high fat diet with either 350 mg/kg. 700 mg/kg of EA or 250 mg/kg of metformin for a 10 - week period. EA not only reduced body weight in a dose dependent manner, but also corrected associated hyperinsulinemia and hyperlipidemia. EA exerted beneficial effects on glucose and lipid homeostasis in diabetes that are not secondary to its ability to decrease food intake but its specific effects on hepatic lipo-genesis related genes （SREBPla. FAS. GAPT） and PPAR - gamma gene expression in periepididymal fat. Taken together, the combined effect of EA to reduce plasma glucose and lipid levels, and reduce the deposition of triglyceride in the liver are indicative of a marked improvement in high fat diet - induced hyperglycemia and hyperlipidemia.

关键词： Euonymus alatus high fat diet lipogenesis PPAR-gamma.This work was funded by Plant Diversity Research Center of 21st Century Frontier Re- search Program.

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Preface

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Journal of Computer Science & Technology 2013年第4期28卷 583-584页

作者： Jinho Kim Sang-Wook Kim sanghyun park Haixun Wang Department of Computer Science Kangwon National University Department of Computer Science and Engineering Hanyang University Department of Computer Science Yonsei University Research Scientist Google Research

It is our great pleasure to edit this special section of the Journal of Computer Science and Technology （JCST）. The database field has experienced a rapid growth with increasing of data. Therefore, novel technology for covering emerging databases such as network or graph analysis, spatial or temporal data analysis, search, recommendation, and data mining is required. The goal of the section is to provide state-of-the-art research issues, challenges, new technologies, and solutions of emerging databases. This section publishes seven interesting articles related to query processing, trajectory data reduction, botnet evolution, recommendation system, bielustering, and protein structure alignment. The articles are summarized as follows.

关键词： pleasure special section JCST

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Grasping Force Estimation by sEMG Signals and Arm Posture: Tensor Decomposition Approach

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Journal of Bionic Engineering 2019年第3期16卷 455-467页

作者： sanghyun Kim Joowan Kim Mingon Kim Seungyeon Kim Jaeheung park Department of Transdisciplinary Studies Seoul National University Suwon 16229 Korea Advanced Institutes of Convergence Technology Suwon 16229 Korea

Grasping force estimation using surface Electromyography (sEMG) has been actively investigated as it can increase the manipulability and dexterity of prosthetic hands and robotic hands. Most of the current studies in this area only focus on finding the relationship between sEMG signals and the grasping force without considering the arm posture. Therefore, regression models are not suitable to predict grasping force in various arm postures. In this paper, a method to predict the grasping force from sEMG signals and various grasping postures is developed. The proposed algorithm uses a tensor algebra to train a multi-factor model relevant to sEMG signals corresponding to various grasping forces and postures of the wrist and forearm in multiple dimensions. The multi-factor model is then decomposed into four independent factor spaces of the grasping force, sEMG signals, wrist posture, and forearm posture. Moreover, when a participant executes a new posture, new factors for the wrist and forearm are interpolated in the factor spaces. Thus, the grasping force with various postures can be predicted by combining these factors. The effectiveness of the proposed method is verified through experiments with ten healthy subjects, demonstrating the higher performance of proposed grasping force prediction method than the previous algorithm.

关键词： surface Electromyography (sEMG) grasping force force estimation tensor decomposition

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Security Analysis of Smart Speaker: Security Attacks and Mitigation

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Computers, Materials & Continua 2019年第9期61卷 1075-1090页

作者： Youngseok park Hyunsang Choi sanghyun Cho Young-Gab Kim Naver Corp. 6 Buljeong-roJeongja-dongBundang-guGyeonggi-doKorea Sejong University 209Neungdong-roGwangjin-guSeoul05006Korea

The speech recognition technology has been increasingly common in our ***,a number of commercial smart speakers containing the personal assistant system using speech recognition came *** the smart speaker vendors have been concerned about the intelligence and the convenience of their assistants,but there have been little mentions of the smart speakers in security *** the smart speakers are becoming the hub for home automation,its security vulnerabilities can cause critical *** this paper,we categorize attack vectors and classify them into hardware-based,network-based,and *** the attack vectors,we describe the detail attack scenarios and show the result of tests on several commercial smart *** addition,we suggest guidelines to mitigate various attacks against smart speaker ecosystem.

关键词： Smart speaker personal assistant system IoT security

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Explicitly Color-Inspired Neural Style Transfer Using

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Computer Modeling in Engineering & Sciences 2024年第12期141卷 2143-2164页

作者： Bumsoo Kim Wonseop Shin Yonghoon Jung Youngsup park sanghyun Seo Department of Applied Art and Technology Chung-Ang UniversityAnseong17546Republic of Korea Department of Advanced Imaging Science Multimedia&Film Chung-Ang UniversitySeoul06974Republic of Korea Innosimulation Co. Ltd.Gangseo-gu07794Republic of Korea School of Art and Technology Chung-Ang UniversityAnseong17546Republic of Korea

Arbitrary style transfer aims to perceptually reflect the style of a reference image in artistic creations with visual *** style transfer models,particularly those using adaptive instance normalization(AdaIN)layer,rely on global statistics,which often fail to capture the spatially local color distribution,leading to outputs that lack variation despite geometric *** address this,we introduce Patchified AdaIN,a color-inspired style transfer method that applies AdaIN to localized patches,utilizing local statistics to capture the spatial color distribution of the reference *** approach enables enhanced color awareness in style transfer,adapting dynamically to geometric transformations by leveraging local image *** Patchified AdaIN builds on AdaIN,it integrates seamlessly into existing frameworks without the need for additional training,allowing users to control the output quality through adjustable blending *** comprehensive experiments demonstrate that Patchified AdaIN can reflect geometric transformations(e.g.,translation,rotation,flipping)of images for style transfer,thereby achieving superior results compared to state-of-the-art *** experiments show the compatibility of Patchified AdaIN for integration into existing networks to enable spatial color-aware arbitrary style transfer by replacing the conventional AdaIN layer with the Patchified AdaIN layer.

关键词： Neural style transfer image synthesis image stylization

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Research on flexible display at Ulsan National Institute of Science and Technology

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npj Flexible Electronics 2017年第1期1卷 47-59页

作者： Jihun park sanghyun Heo Kibog park Myoung Hoon Song Ju-Young Kim Gyouhyung Kyung Rodney Scott Ruoff Jang-Ung park Franklin Bien School of Materials Science and Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan Metropolitan City 44919Republic of Korea School of Electrical and Computer Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan Metropolitan City 44919Republic of Korea Department of Physics Ulsan National Institute of Science and Technology(UNIST)Ulsan Metropolitan City 44919Republic of Korea School of Design and Human Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan Metropolitan City 44919Republic of Korea Center for Multidimensional Carbon Materials Institute for Basic Science(IBS)Ulsan 44919Republic of Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea

Displays represent information visually,so they have become the fundamental building block to visualize the data of current electronics including ***,electronics have been advanced toward flexible and wearable electronics that can be bent,folded,or stretched while maintaining their performance under various ***,recent advances in research to demonstrate flexible and wearable displays are *** introduce these results by dividing them into several categories according to the components of the display:active-matrix backplane,touch screen panel,light sources,integrated circuit for fingerprint touch screen panel,and characterization tests;and we also present mechanical tests in nano-meter scale and visual ergonomics research.

关键词： dividing electronics panel

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An Efficient Attention-Based Strategy for Anomaly Detection in Surveillance Video

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Computer Systems Science & Engineering 2023年第9期46卷 3939-3958页

作者： Sareer Ul Amin Yongjun Kim Irfan Sami Sangoh park sanghyun Seo Department of Computer Science and Engineering Chung-Ang UniversitySeoul06974Korea Intelligent Convergence Research Lab. ETRIDaeJeon34129Korea Department of Electrical and Electronics Engineering Chung-Ang UniversitySeoul06974Korea College of Art and Technology Chung-Ang UniversityAnseong17546Korea

In the present technological world,surveillance cameras generate an immense amount of video data from various sources,making its scrutiny tough for computer vision *** is difficult to search for anomalous events manually in thesemassive video records since they happen infrequently and with a low probability in real-world monitoring ***,intelligent surveillance is a requirement of the modern day,as it enables the automatic identification of normal and aberrant behavior using artificial intelligence and computer vision *** this article,we introduce an efficient Attention-based deep-learning approach for anomaly detection in surveillance video(ADSV).At the input of the ADSV,a shots boundary detection technique is used to segment prominent ***,The Lightweight ConvolutionNeuralNetwork(LWCNN)model receives the segmented frames to extract spatial and temporal information from the intermediate *** that,spatial and temporal features are learned using Long Short-Term Memory(LSTM)cells and Attention Network from a series of frames for each anomalous activity in a *** detect motion and action,the LWCNN received chronologically sorted ***,the anomaly activity in the video is identified using the proposed trained ADSV *** experiments are conducted on complex and challenging benchmark *** addition,the experimental results have been compared to state-ofthe-artmethodologies,and a significant improvement is attained,demonstrating the efficiency of our ADSV method.

关键词： Attention-based anomaly detection video shots segmentation video surveillance computer vision deep learning smart surveillance system violence detection attention model

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