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Development of Ubiquitous Simulation Service Structure Based on High Performance Computing Technologies

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Journal of Materials Science & Technology 2008年第3期24卷 374-378页

作者： Sang-hyun CHO jeong-Kil CHOI Center For e-Design KITECH7-47Songdo-DongYeonsu-Ku

The simulation field became essential in designing or developing new casting products and in improving manufacturing processes within limited time, because it can help us to simulate the nature of processing, so that developers can make ideal casting designs. To take the prior occupation at commercial simulation market, so many development groups in the world are doing their every effort. They already reported successful stories in manufacturing fields by developing and providing the high performance simulation technologies for multipurpose. But they all run at powerful desk-side computers by well-trained experts mainly, so that it is hard to diffuse the scientific designing concept to newcomers in casting field. To overcome upcoming problems in scientific casting designs, we utilized information technologies and full-matured hardware backbones to spread out the effective and scientific casting design mind, and they all were integrated into Simulation Portal on the web. It professes scientific casting design on the NET including ubiquitous access way represented by ＂Anyone, Anytime, Anywhere＂ concept for casting designs.

关键词： Parallel computation Message passing interface (MPI) Shared memory processing (SMP) Clustering Ubiquitous

Analytical evaluation and experimental validation on dynamic rocking behavior for shallow foundation considering structural response

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Earthquake Engineering and Engineering Vibration 2022年第1期21卷 37-51页

作者： Kil-Wan ko jeong-Gon Ha Dong-Soo Kim Department of Civil and Environmental Engineering UC BerkeleyCalifornia 94720USA Advanced Structures and Seismic Safety Research Division Daejeon 34057Korea Department of Civil and Environmental Engineering KAISTDaejeon 34141Korea

The challenge in the practical application of rocking foundations is the estimation of its performance,particularly the rotation angle,during a strong *** this study,the dynamic rocking behavior for a shallow foundation considering structural response was evaluated through two analytical approaches:the conventional soil-foundation-structure interaction(SFSI)governing equation of a single-degree-of-freedom(SDOF)structure on a rocking shallow foundation,and the Housner rocking model(i.e.,a rocking rigid block on a rigid base).Both approaches were validated with dynamic centrifuge *** test models consisted of a soft soil deposit,a shallow rectangular foundation,and an SDOF structure dominated by a bending behavior.A total of 11 foundation-structure systems and six seismic waves,including recorded earthquake signals and sinusoidal waves,were *** results showed that the conventional SFSI equation well predicted the maximum rotation during strong ***,this method was less accurate regarding the rotational phase information and maximum rotation of the foundation during weak *** the other hand,although the modified Housner′s rocking model required five parameters relevant to a soil-foundation-structure system,it overestimated the maximum rotation of the foundation when compared with the results from dynamic centrifuge tests.

关键词： soil-foundation-structure interaction maximum rotation angle rocking foundation Housner rocking model dynamic centrifuge test

Stick-and-play system based on interfacial adhesion control enhanced by micro/nanostructures

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Nano Research 2021年第9期14卷 3143-3158页

作者： Jung II Yoo Seung hyun Kim Heung Cho ko School of Materials Science and Engineering Gwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea

The evolution of membrane-type electronics has facilitated the development of stick-and-play systems,which confer diverse electrical functions to various planar or arbitrary curvilinear *** stick-and-play concept is based on the development of thin electronic devices in a printable format and their subsequent transfer to target *** development of this technology requires control of the interfacial adhesion of the electronic prints for retrieval from a carrier and transfer to the target ***,we discuss the transfer printing for membrane-type electronics,starting from an overview of materials available for flexible substrates,transfer printing of electronic prints for retrieval,and assembly for further ***,we explain the stick-and-play concept based on fabricated membrane-type electronics;"stick" and “play"refer to the transfer of electronic devices and the performance of their electronic functions,*** particular,we broadly survey various methods based on micro/nanostructures,including gecko-inspired,interlocking,cephalopod-sucker-inspired,and cilia structures,which can be employed to stick-and-play systems for enhancing interfacial adhesion with complex target surfaces under dynamic and wet ***,we highlight the stick-and-play system application of micro/nanostructures for skin-attachable biomedical electronics,e-textiles,and environmental monitoring electronics.

关键词： transfer printing interfacial adhesion flexible electronics stick-and-play system bioinspired adhesive

SMINER:Detecting Unrestricted and Misimplemented Behaviors of Software Systems Based on Unit Test Cases

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Computers, Materials & Continua 2023年第5期75卷 3257-3274页

作者： Kyungmin Sim jeong hyun Yi Haehyun Cho School of Software Soongsil UniversitySeoul06978Korea

Despite the advances in automated vulnerability detection approaches,security vulnerabilities caused by design flaws in software systems are continuously appearing in real-world *** security design flaws can bring unrestricted and misimplemented behaviors of a system and can lead to fatal vulnerabilities such as remote code execution or sensitive data ***,it is an essential task to discover unrestricted and misimplemented behaviors of a ***,it is a daunting task for security experts to discover such vulnerabilities in advance because it is timeconsuming and error-prone to analyze the whole code in ***,most of the existing vulnerability detection approaches still focus on detecting memory corruption bugs because these bugs are the dominant root cause of software *** paper proposes SMINER,a novel approach that discovers vulnerabilities caused by unrestricted and misimplemented *** first collects unit test cases for the target system from the official ***,preprocess the collected code *** uses pre-processed data to show the security policies that can occur on the target system and creates a test case for security policy *** demonstrate the effectiveness of SMINER,this paper evaluates SMINER against Robot Operating System(ROS),a real-world system used for intelligent robots in Amazon and controlling satellites in National Aeronautics and Space Administration(NASA).From the evaluation,we discovered two real-world vulnerabilities in ROS.

关键词： Security vulnerability test case generation security policy test robot operating system vulnerability assessment

Effects of ozonation and coagulation on effluent organic matter characteristics and ultrafiltration membrane fouling

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Journal of Environmental Sciences 2014年第6期26卷 1325-1331页

作者： Kwon jeong Dae-Sung Lee Do-Gun Kim Seok-Oh ko Department of Civil Engineering Kyung Hee UniversityYongin 446-701 Korea Institute of Construction Technology KUMHO Engineering & ConstructionYongin 449-822 Korea

Effluent organic matter （EfOM） is the major cause of fouling in the low pressure membranes process for wastewater reuse. Coagulation and oxidation of biological wastewater treatment effluent have been applied for the fouling control of microfiltration membranes. However, the change in EfOM structure by pre-treatments has not been clearly identified. The changes of EfOM characteristics induced by coagulation and ozonation were investigated through size exclusion chromatography, UV/Vis spectrophotometry, fluorescence spectrophotometry and titrimetric analysis to identify the mechanisms in the reduction of ultrafiltration （UF） membrane fouling. The results indicated that reduction of flux decline by coagulation was due to modified characteristics of dissolved organic carbon （DOC） content. Total concentration of DOC was not reduced by ozonation. However, the mass fraction of the molecules with molecular weight larger than 5 kDa, fluorescence intensity, aromaticity, highly condensed chromophores, average molecular weight and soluble microbial byproducts decreased greatly after ozonation. These results indicated that EfOM was partially oxidized by ozonation to low molecular weight, highly charged compounds with abundant electron- withdrawing functional groups, which are favourable for alleviating UF membrane flux decline.

关键词： effluent organic matter fouling ultrafiltration oxidation molecular weight distribution acidity

What is the appropriate strategy for diagnosing NAFLD using ultrasonography in obese children?

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World Journal of Pediatrics 2017年第3期13卷 248-254页

作者： Jee hyun Lee Su Jin jeong Department of Pediatrics Ansan HospitalKorea University Medical CenterCollege of MedicineKorea University Department of Pediatrics Bundang CHA Medical CenterCHA University School of MedicineKorea

Background:The aim of this study is to identify obese children who are candidates for a potential diagnosis of non-alcoholic fatty liver disease (NAFLD).Methods:We enrolled 242 obese children (122 boys and 120 girls) aged 7-16 years who were examined with abdominal ultrasonography in our pediatric obesity *** compared patients in the normal group with those in the NAFLD group (mild disease,moderate to severe disease) and identified the optimal anthropometric parameters among height,weight,body mass index (BMI),waist circumference,hip circumference,waist to height ratio (WHtR),and waist to hip ratio to predict NAFLD using a receiver operating characteristic curve *** also investigated risk factors associated with NAFLD for the anthropometric parameters and the biochemical model using logistic ***:The high-and low-risk groups for hepatic steatosis relative to a WHtR of 0.56 as the standard point showed significant differences in hepatic steatosis severity grade (P0.56 (2.25,1.05-4.81),and waist circumference >90th percentile (20.22,9.21-44.36) in the anthropometric parameter model and elevated alanine aminotransferase levels (boys >25.8 U/L,girls >22.1 U/L) (6.93,2.52-19.03),hypertriglyceridemia (>110 mg/dL) (3.80,1.23-11.75),and triglyceride to HDL cholesterol ratio >3 (9.23,2.95-8.83) in the biochemical parameter ***:A diagnostic approach to hepatic steatosis is recommended as part of the proper screening and stratification of risk factors in obese *** is a simple and convenient method of effectively identifying obese children who are candidates for hep

关键词： hepatic steatosis non-alcoholic fatty liver disease obesity waist-to-height ratio

Quantitative assessment of the relevance of organic-aniontransporting-polypeptide 1B1 and 2B1 polymorphisms in fexofenadine pharmacokinetic variants via pharmacometrics

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Journal of Pharmaceutical Analysis 2023年第6期13卷 660-672页

作者： Ji-Hun Jang Seung-hyun jeong Yong-Bok Lee Department of Pharmacy College of PharmacyChonnam National UniversityGwangju61186Republic of Korea Department of Pharmacy College of PharmacySunchon National UniversitySuncheon-si57922Republic of Korea

Fexofenadine is useful in various allergic disease ***,the pharmacokinetic variability information and quantitative factor identification of fexofenadine are very *** study aimed to verify the validity of previously proposed genetic factors through fexofenadine population pharmacokinetic modeling and to explore the quantitative correlations affecting the pharmacokinetic *** of the organic-anion-transporting-polypeptide(OATP)1B1 and 2B1 have been proposed to be closely related to fexofenadine pharmacokinetic ***,modeling was performed using fexofenadine oral exposure data according to the OATP1B1-and ***1B1 and 2B1 were identified as effective covariates of clearance(CL/F)and distribution volume(V/F)-CL/F,respectively,in fexofenadine pharmacokinetic ***/F and average steady-state plasma concentration of fexofenadine differed by up to 2.17-and 2.20-folds,respectively,depending on the OATP1B1 *** the individuals with different OATP2B1 polymorphisms,the CL/F and V/F differed by up to 1.73-and 2.00-folds,*** of the areas under the curves following single-and multiple-administrations,and the cumulative ratio were significantly different between OATP1B1-and 2B1-polymorphism *** on quantitative prediction comparison through a model-based approach,OATP1B1 was confirmed to be relatively more important than 2B1 regarding the degree of effect on fexofenadine pharmacokinetic *** on the established pharmacokineticpharmacodynamic relationship,the difference in fexofenadine efficacy according to genetic polymorphisms of OATP1B1 and 2B1 was 1.25-and 0.87-times,respectively,and genetic consideration of OATP1B1 was expected to be important in the pharmacodynamics area as *** population pharmacometrics study will be a very useful starting point for fexofenadine precision medicine.

关键词： OATP1B1 OATP2B1 Fexofenadine Population pharmacometrics Genetic polymorphism

Decomposition of Nitrogen Trifluoride Using Low Power Arc Plasma

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Plasma Science and Technology 2013年第9期15卷 923-927页

作者： Jee-Hun ko Sooseok CHOI hyun-Woo PARK Dong-Wha PARK Department of Chemical Engineering and Regional Innovation Center for Environmental Technology of Thermal Plasma (RIC-ETTP)INHA University253 Yonghyun-dongNam-guIncheon 402-751Republic of Korea Department of Environmental Chemistry and Engineering Tokyo Institute of Technology 4259-G1-22Nagatsuta-choMidori-kuYokohama 226-8502Japan

The low power arc plasma is characterized by extremely high enthalpy and temper- ature and it is easy to generate and control, and thus thermal decomposition process based on the plasma torch is receiving a great attention for decomposing non-degradable greenhouse gases. In order to elevate the economic feasibility, the effects of input power, waste gas flow rate and additive gases on the destruction and removal efficiency （DRE） of NF3 are examined. Specific energy density （SED） deceases as the flow rate increases, and accordingly, the DRE is reduced. The DRE is basically determined by the specific energy density. The highest DRE of NF3 was 97% for the waste gas flow rate of 100 L/min at a low input power level of 2 kW with the help of hydrogen additional gas. The inlet and outlet concentration of NF3 was analyzed using Fourier transform infrared spectroscopy （FT-IR） for DRE of NF3 evaluation. As a result, large amount of NF3 can be efficiently decomposed by low power arc plasma systems.

关键词： arc plasma decomposition nitrogen trifluoride

Augmenting Android Malware Using Conditional Variational Autoencoder for the Malware Family Classification

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Computer Systems Science & Engineering 2023年第8期46卷 2215-2230页

作者： Younghoon Ban jeong hyun Yi Haehyun Cho Soongsil University Seoul06978Korea

Android malware has evolved in various forms such as adware that continuously exposes advertisements,banking malware designed to access users’online banking accounts,and Short Message Service(SMS)malware that uses a Command&Control(C&C)server to send malicious SMS,intercept SMS,and steal *** using many malicious strategies,the number of malware is steadily *** Android malware threats numerous users,and thus,it is necessary to detect malware quickly and *** malware has distinguishable characteristics based on its ***,security researchers have tried to categorize malware based on their behaviors by conducting the familial analysis which can help analysists to reduce the time and cost for analyzing ***,those studies algorithms typically used imbalanced,well-labeled open-source dataset,and thus,it is very difficult to classify some malware families which only have a few number of *** overcome this challenge,previous data augmentation studies augmented data by visualizing malicious codes and used them for malware ***,visualization of malware can result in misclassifications because the behavior information of the malware could be *** this study,we propose an android malware familial analysis system based on a data augmentation method that preserves malware behaviors to create an effective multi-class classifier for malware family *** this end,we analyze malware and use Application Programming Interface(APIs)and permissions that can reflect the behavior of malware as *** using these features,we augment malware dataset to enable effective malware detection while preserving original malicious *** evaluation results demonstrate that,when a model is created by using only the augmented data,a macro-F1 score of 0.65 and accuracy of 0.63%.On the other hand,when the augmented data and original malware are used together,the evaluation results show that a macro-F1 sc

关键词： Android data augmentation artificial intelligence cybersecurity