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Reinforcing Performance of Networked Silicas in Silica-filled Chloroprene Rubber Compounds
( Changseok Ryu ),( Jae-kyoung Yang ),( Wonhyeong Park ),( Sun Jung Kim ),( Doil Kim ),( Gon Seo ),( Wook-soo Kim ),( Ki Woong Ahn ),( Beak Hwan Kim ) 한국고무학회 2019 엘라스토머 및 콤포지트 Vol.54 No.1
The physical properties of chloroprene rubber (CR) compounds reinforced with networked silicas were investigated by comparing them to those reinforced with conventional silica to observe the effect of the organic connection bonds combining silica particles on their cure, tensile, and aging performance. The introduction of networked silica to CR increase in silica content to 80 phr in rubber, while the content of conventional silica was limited to 60 phr. The CR compounds reinforced with networked silica showed higher resistance to combustion. The gradual increases in delta torque, Mooney viscosity, and modulus of silica-filled CR compounds with silica content were mainly attributed to the specific interaction between the chlorine atoms of CR and the hydroxyl groups of silica. The CR compounds reinforced with networked silica showed low compression set and heat build-up and maintained their high modulus even after thermal, oil, and ozone aging.
전통의학 정보포털 활성화를 위한 한의전문가 의견분석에 관한 연구
예상준(Sangjun Yea),장현철(Hyunchul Jang),김상균(Sangkyun Kim),김진현(Jinhyun Kim),김철(Chul Kim),김익태(Iktae Kim),장윤지(Yunji Jang),김창석(Changseok Kim),송미영(Miyoung Song) 한국한의학연구원 2011 한국한의학연구원논문집 Vol.17 No.1
We surveyed attendee at TKM Information Common Application Committee who are the chairman of TKM journals, the dean of oriental medicine colleges and the head of oriental medicine institutes. We analyzed the survey results to activate OASIS and to more utilize OASIS in TKM research. From the analysis, the experts predict that TKM literature information and combined search connected to internal/external TM database are most applicable to OASIS. If the contents and functions are provided in OASIS, experts said that they will use more 2.2 times than now. We drew the future plan of OASIS from the 2 survey analysis which are conducted by OASIS users and TKM experts. It is made up 6 kinds of strategies such as core business model, data, meta-data and etc. Because this study has surveyed the TKM authoritative experts for the future plan of OASIS, it is significant study to get objective indices.
( Changseok Ryu ),( Sun Jung Kim ),( Do Il Kim ),( Shinyoung Kaang ),( Gon Seo ) 한국고무학회 2016 엘라스토머 및 콤포지트 Vol.51 No.2
The effect of the surface area of silicas on their reinforcing performance to styrene-butadiene rubber (SBR) compounds was systematically investigated. The feasibility of the Brunauer-Emmett-Teller surface area (SBET) as a parameter representing the characteristics of the silicas was discussed compared to the mesopore volume, c value, oil absorption, and uptake of silane. The increase in SBET of silicas caused a considerable increase in Mooney viscosity, minimum torque, and hysteresis loss of the silica-filled SBR compounds, while significantly enhancing their abrasion property. These changes were explained by the attrition between the hydrophilic silica surface and the hydrophobic rubber chains. As expected, the change in SBET did not induce any remarkable changes in the cure, processing, tensile, and dynamic properties of the silicafilled SBR compounds because the crosslinking density of the rubber chains mainly determined these properties.
근사적 동적계획을 활용한 요격통제 및 동시교전 효과분석
이창석(Changseok Lee),김주현(Ju-Hyun Kim),최봉완(Bong Wan Choi),김경택(Kyeongtaek Kim) 한국항공우주학회 2022 韓國航空宇宙學會誌 Vol.50 No.4
저고도 궤적의 장사정포 위협이 대두됨에 따라 이를 방어할 요격 시스템의 개발이 시작될 예정이다. 이러한 장사정포의 공격을 방어하는 문제는 전형적인 동적 무기 표적 할당 문제다. 동적 무기 표적 할당 문제에서는 한 시점에서의 의사결정 결과가 이후 시점의 의사결정 과정에 영향을 주며, 이는 마코브 의사결정 모형의 특징이기도 하다. 장사정포의 공격을 방어하기 위한 의사결정 과정에 허용되는 시간은 공격자와 방어자의 거리를 고려할 때 저고도 궤적의 동시 다발성 발사체에 대한 대응은 수 초 이내에 결정되어야 하나, 짧은 시간 내에 마코브 의사결정 과정으로 최적해를 구하는 것은 불가능하다. 본 논문에서는 장사정포 공격을 방어하는 동적 무기 표적 할당 문제를 마코브 의사결정 문제로 나타내고, 3가지 시나리오를 작성한 후 근사적 동적계획 방법을 적용하여 요격이 가능 시간 안에 해의 도출이 가능한지를 시뮬레이션을 통하여 확인하였다. 도출된 해의 품질을 검증하기 위하여 각 시나리오에 대하여 근사적 동적계획을 적용한 결과와 Shoot-Shoot-Look 방법을 적용한 결과를 비교하였다. 시뮬레이션 결과, 장사정포의 방어 시나리오에 대하여 근사적 동적계획의 결과가 Shoot-Shoot-Look 방법을 이용한 결과보다 우수함을 보였다. As low altitude long-range artillery threat has been strengthened, the development of anti-artillery interception system to protect assets against its attacks will be kicked off. We view the defense of long-range artillery attacks as a typical dynamic weapon target assignment (DWTA) problem. DWTA is a sequential decision process in which decision making under future uncertain attacks affects the subsequent decision processes and its results. These are typical characteristics of Markov decision process (MDP) model. We formulate the problem as a MDP model to examine the assignment policy for the defender. The proximity of the capital of South Korea to North Korea border limits the computation time for its solution to a few second. Within the allowed time interval, it is impossible to compute the exact optimal solution. We apply approximate dynamic programming (ADP) approach to check if ADP approach solve the MDP model within processing time limit. We employ Shoot-Shoot-Look policy as a baseline strategy and compare it with ADP approach for three scenarios. Simulation results show that ADP approach provide better solution than the baseline strategy.