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Management of schemes and Threat Prevention in ICs Partner Companies security

Computers, Materials & Continua 2021年第12期69卷 3659-3684页

作者： sangdo Lee jun-ho Huh Cyber security Center Korea Midland Power Co.Ltd.BoryeongKorea Department of Data Informatics (National)Korea Maritime and Ocean UniversityBusanKorea

An analysis of the recent major security incidents related to industrial control systems,revealed that most had been caused by company ***,enterprise security management systems have been developed to focus on companies’***,several hacking incidents,involving major companies and public/financial institutions,were actually attempted by the cooperative firms or the outsourced manpower undertaking maintenance ***,institutions that operate industrial control systems(ICss)associated with critical national infrastructures,such as traffic or energy,have contracted several cooperative ***,ICT’s importance is gradually increasing,due to outsourcing,and is the most vulnerable factor in *** paper proposes a virtualized security management scheme for the resident cooperative firms in the industrial control *** such companies often cannot afford adequate investment in security,the scheme is to let an ICs company provide the virtualized *** of its merits is the convenience of controlling a VDI server at the *** cooperative firms were classified,based on their respective security levels,and statistics were collected throughout a four-year period for the *** paper analyzes the policies and virtualization systems that have been applied to the security of the partner companies,which engaged in ICs security.A suitable model for ICs security was then proposed by analyzing their effects on the system efficiencies,based on the comparisons of the security inspection results obtained before and after *** proposed system is expected to contribute to industrial safety.

关键词： Nuclear power plant nuclear power plant security virtual machine sCADA ICs IsO27001 VDI based security software engineering

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Adhesion and suction Functions of the Tip Region of a Nectar-drinking Butterfly Proboscis

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Journal of Bionic Engineering 2017年第4期14卷 600-606页

作者： seung Chul Lee jun ho Kim sang Joon Lee Department of Mechanical Engineering Pohang University of Science and Technology Pohang 37673 Gyeongbuk Republic of Korea Center for Biofluid and Biomimic Research Pohang University of Science and Technology Pohang 37673 Gyeongbuk Republic of Korea

In this study, we investigated the dynamic functions of the tip region of the butterfly proboscis through which liquid is sucked during liquid feeding. The microstructures and flow patterns in the tip region of the proboscis were in vivo analyzed. The tip region can be divided into two functional sections： namely adhesion and suction sections. The liquid adheres to the adhesion section during liquid suction. Although the tip region has numerous slits connected to food canal of the proboscis, liquid is mainly sucked through the suction section, which section is submerged in the fluid pulled by the adhesion section and then successfully imbibes liquid. To check the dynamic functions of the tip region, we fabricated a suction tip model having adhesion and suction parts. The in vitro model experiments show that the hydrophilicity of the adhesion part and the existence of the suction inlet improve the liquid uptake driven by a suction pump. This study may provide insights for the biomimetic design of nectar-feeding butterflies.

关键词： butterfly proboscis nectar-feeding strategy suction

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Multifaceted neuroprotective effects of(-)-epigallocatechin-3-gallate(EGCG)in Alzheimer's disease:an overview of pre-clinical studies focused onβ-amyloid peptide

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Food science and Human Wellness 2022年第3期11卷 483-493页

作者： Kumju Youn Chi-Tang ho Mira jun Department of Food science and Nutrition Dong-A UniversityBusan 49315Korea Department of Food science Rutgers UniversityNJ 08901USA Department of Health sciences The graduate School of Dong-A UniversityBusan 49315Korea

Alzheimer’s disease(AD)is the most common neurodegenerative disease characterized by cognitive decline and memory *** lines of evidence indicate that excessiveβ-amyloid peptide(Aβ)generation and aggregation play pivotal roles in the initiation of AD,leading to various biochemical alteration including oxidative damage,mitochondrial dysfunction,neuroinflammation,signaling pathway and finally resulting in neuronal *** has a complex pathogenic mechanism,and a single-target approach for anti-AD strategy is thus full of *** overcome these limitations,the present study focused to review on one of multiple target-compounds,(-)-epigallocatechin-3-gallate(EGCG)for the prevention and treatment of *** is a main bioactive polyphenol in green tea and has been reported to exert potent neuroprotective properties in a wide array of both cellular and animal models in *** review demonstrated multiple neuroprotective efficacies of EGCG by focusing on the involvement of Aβ-evoked damage and its Aβ***,to understand its mechanism of action on the brain,the permeability of the blood-brain barrier was also discussed.

关键词： Alzheimer’s disease β-Amyloid peptide Green tea EGCG Neuroinflammation

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study on accuracy of casting flow simulation

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China Foundry 2017年第5期14卷 333-338页

作者： Youngsim Choi jun-ho hong ho-Young Hwang Kyuhong Kim Dept.of Mechanical&Aerospace Engineering Seoul Nat.Univ.Republic of Korea Korea Institute of Industrial Technology(KITECH) Republic of Korea Institute of Advanced Aerospace Technology Seoul Nat.Univ.Republic of Korea

In the field of casting flow simulation, the application of body-fitted coordinate(BFC) has not been widely used due to the difficulty and low efficiency of grid generation, despite the availability of good quality analysis results. Cartesian coordinates, on the other hand, have been used predominantly in casting process simulations because of their relatively easy and fast grid generation. however, Cartesian grid systems cannot obtain accurate results because they cannot express the geometries properly. In this study, Cut Cell method was applied to solve this problem. The three-dimensional incompressible viscous governing equation was analyzed using a function defined for the volume and area of the casting in the cutting cell. Using the Cut Cell method, accurate flow analysis results were also obtained in the Cartesian grid systems. The tests of simple shape and the applications of actual casting product have been tried with Cut Cell method.

关键词： casting flow Cut Cell Cartesian coordinates body-fitted coordinates filling pattern conservationof momentum

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YouTube as a source of patient information on gallstone disease

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World Journal of Gastroenterology 2014年第14期20卷 4066-4070页

作者： jun suh Lee ho seok seo Tae ho hong Department of surgery Armed Forces Capital Hospital Department of surgery Seoul St. Mary’s HospitalCollege of MedicineThe Catholic University of Korea

AIM: To investigate the quality of YouTube videos on gallstone disease and to assess viewer response according to quality.

关键词： YouTube Gallstone disease Gallstone Gallbladder Cholecystitis

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A segment version transcoding for client-centric wireless mobile media streaming

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Journal of Central south University 2013年第9期20卷 2372-2377页

作者： LEE Chong-deuk BANG jun-ho JEONG Taeg-won Division of Electronic Engineering Chonbuk National University Department of IT Applied system Engineering Chonbuk National University

An object segment similarity function is taken into account from the continuous media frames to measure the individual streaming profit of certain segment versions of a media ***,a new segment version-based transcoding(sVT)mechanism is derived for a quality of service(Qos)of client-centric media streaming in wireless mobile *** derived function utilizes the fuzzy similarity of certain segment versions of an *** mechanism provides the effectiveness of reduction of the stream startup latency among segment versions,and the average access of each ***,the proposed segment version transcoding mechanism reduces packet loss which in turn increases streaming performance and *** performance of the partitioned segment versions is simulated and some segment versions are *** simulation results show that the proposed mechanism outperforms the other mechanisms in average cache hit ratio and in average startup latency ratio.

关键词： similarity function media object segment version client-centric media streaming

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Estimation of Turbulent sensible Heat and Momentum Fluxes over a Heterogeneous Urban Area Using a Large Aperture scintillometer

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Advances in Atmospheric sciences 2015年第8期32卷 1092-1105页

作者： sang-Hyun LEE jun-ho LEE Bo-Young KIM Department of Atmospheric science Kongju National University Department of Optical Engineering Kongju National University

The accurate determination of surface-layer turbulent fluxes over urban areas is critical to understanding urban boundary layer （UBL） evolution. In this study, a remote-sensing technique using a large aperture scintillometer （LAs） was investigated to estimate surface-layer turbulent fluxes over a highly heterogeneous urban area. The LAs system, with an optical path length of 2.1 km, was deployed in an urban area characterized by a complicated land-use mix （residential houses, water body, bare ground, etc.）. The turbulent sensible heat （QH） and momentum fluxes （z） were estimated from the scintillation measurements obtained from the LAs system during the cold season. Three-dimensional LAs footprint modeling was introduced to identify the source areas （＂footprint＂） of the estimated turbulent fluxes. The analysis results showed that the LAs-derived turbulent fluxes for the highly heterogeneous urban area revealed reasonable temporal variation during daytime on clear days, in comparison to the land-surface process-resolving numerical modeling. A series of sensitivity tests indicated that the overall uncertainty in the LAs-derived daytime QH was within 20%-30% in terms of the influence of input parameters and the non- dimensional similarity function for the temperature structure function parameter, while the estimation errors in z were less sensitive to the factors of influence, except aerodynamic roughness length. The 3D LAs footprint modeling characterized the source areas of the LAs-derived turbulent fluxes in the heterogeneous urban area, revealing that the representative spatial scales of the LAs system deployed with the 2.1 km optical path distance ranged from 0.2 to 2 km2 （a ＂micro-a scale＂）, depending on local meteorological conditions.

关键词： heterogeneous surface large aperture scintillometer mesoscale modeling surface energy balance turbulentexchange

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Fingerprint inspired advanced end-effector and its applications

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Friction 2022年第10期10卷 1739-1750页

作者： sung ho LEE Hyo sung KIM Han jun PARK Moon Kyu KWAK Department of Electrical Engineering and Computer science University of MichiganAnn Arbor 48109USA Department of Mechanical Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

The human fingertip consists of a fingerprint with many micro-grating *** main roles of the fingerprint could be divided into two purposes,namely,the enhancement of the frictional force and the effective transmittance of the *** this study,we present the fingerprint-inspired end-effector that has not only admirable frictional force but also electric *** end-effector is composed of fluorocarbon rubber,one of the famous materials to achieve high frictional force and *** various experiments,the novel performance of micro structured fluorocarbon rubber end-effector(MsFE)is characterized by comparing with a macroscale patterned sample(MPs),which has been already used in real industrial *** results are analyzed ***,as feasible applications,we suggest two applications based on the role of the *** is the conductive astronaut glove with high frictional force,and the other one is a non-slip pad for the next-generation glass transfer *** these experiments,we successfully observe the enhanced system performance and confirm the possibility of using the MsFE as feasible *** believe that the MsFE could be a useful and powerful alternative as an end-effector,not only in the aerospace industry but also in display manufacturing processes.

关键词： fingerprint end-effector fluorocarbon rubber(FKM) glass transfer system spacesuit

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Gastric cancer surgery in cirrhotic patients: Result of gastrectomy with D2 lymph node dissection

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World Journal of Gastroenterology 2005年第30期11卷 4623-4627页

作者： jun ho Lee junuk Kim Jae ho Cheong Woo Jin Hyung seung ho Choi sung hoon Noh Research Institute and hospital Department of surgery

AIM： To explore the feasibility of performing gastrectomy with D2 lymphadenectomy in gastric cancer patients with liver cirrhosis. METhoDs： A total of 7 178 patients were admitted with a diagnosis of liver cirrhosis from January 1993 to December 2003. We reviewed the records of 142 patients who were diagnosed with liver cirrhosis and gastric adenocarcinoma during the same period. Gastrectomy with D2 lymph node dissection for carcinoma of the stomach was performed in 94 patients with histologically proven hepatic cirrhosis. REsULTs： All but 12 patients were dassified as Child＇s class A. Only 35 patients （37.2%） were diagnosed with cirrhosis before operation. seventy-three patients underwent a subtotal gastrectomy （77.7%） and 21 patients （22.3%） underwent a total gastrectomy, each with D2 or more lymph node dissection. Two patients （3.8%） who had prophylactic intra-operative drain placement, died of postoperative complications from hepatorenal failure with intractable ascites. Thirty-seven patients （39.4%） experienced postoperative complications. The extent of gastric resection did not influence the morbidity whereas serum aspartate aminotransferase level （P = 0.011） and transfusion did （P = 0.008）. The most common postoperative complication was ascites （13.9%） followed by wound infection （10.6%）. CONCLUsION： We concluded that the presence of compensated cirrhosis, i.e. Child class A, is not a contraindication against gastrectomy with D2 or more lymph node dissection, when curative resection for gastric cancer is possible. Hepatic reserve and meticulous hemostasis are the likely determinants of operative prognosis.

关键词： Gastric cancer Liver cirrhosis D2 lymph nodedissection Morbidity Mortality

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2D spinel ZnCo_(2)O_(4) microsheet-coated functional separator for promoted redox kinetics and inhibited polysulfide dissolution

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Journal of Energy Chemistry 2021年第4期30卷 468-475页

作者： Jeong seok Yeon Tae ho Park Young Hun Ko Periyasamy sivakumar jun su Kim Youngkywon Kim ho seok Park school of Chemical Engineering Sungkyunkwan UniversitySuwon 16419Gyeonggi-doRepublic of Korea Advanced Batteries Research Center Korea Electronics Technology InstituteSeongnam 13509Gyeonggi-doRepublic of Korea Department of Health sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan UniversitySuwon 16419Gyeonggi-doRepublic of Korea Department of Chemistry Dongguk University-Seoul CampusJung-gu 04620 SeoulRepublic of Korea

Lithium-sulfur(Li-s)batteries are receiving increasing attention as one of the potential next-generation batteries,owing to their high energy densities and low ***,practical Li-s batteries with high energy densities are extremely hindered by the sulfur loss,low Coulombic efficiency,and short cycling life originating from the polysulfide(LiPs)*** this study,two-dimensional(2D)ZnCo_(2)O_(4) microsheets fabricated by a facile hydrothermal process are employed to modify the separator,for improving the electrochemical performances of Li-s *** resulting 2D Zn Co_(2)O_(4)-coated separator features a coating thickness of approximately 10 lm,high ionic conductivity of 1.8 m s/cm,and low mass loading of 0.2 mg/cm^(2).This 2D ZnCo_(2)O_(4)-coated separator effectively inhibits Li Ps shuttle by a strong chemical interaction with Li Ps as well as promotes the redox kinetics by Zn CO2O4-coated layers,as determined by X-ray photoelectron spectroscopy analysis,self-discharge,time-dependent permeation test,Li symmetric cell test,and Li2s nucleation ***,the Li-s batteries based on the 2D Zn Co_(2)O_(4)-coated separator exhibit a high initial discharge capacity of 1292.2 m Ah/g at 0.1 ***,they exhibit excellent long cycle stability at 1 and 2 C with capacity retention of 84%and 86%even after800 cycles,corresponding to a capacity fading rate of 0.020%and 0.016%per cycle,***,these Li-s cells with a high sulfur loading at 5.3 mg/cm^(2) and low electrolyte concentration of 9 l L/mg deliver a high discharge capacity of 4.99 m Ah/cm^(2) after 200 cycles at 0.1 C.

关键词： Lithium sulfur batteries Functional separator 2D microsheet Polysulfide Redox kinetics

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