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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.
김창석 ( Kim Changseok ) 단국사학회 2018 史學志 Vol.57 No.-
6세기 전반은 신라-백제 군사동맹기의 후반부에 해당하며 552ㆍ3년 동맹이 파기되는 배경과 원인이 배태되는 중요한 시기이다. 신라가 내물왕 이래 고구려의 간섭을 받으면서 그 구속에서 벗어나기 위해 백제의 도움이 필요했고, 백제 역시 광개토왕 이래 고구려의 남진을 저지하기 위한 우군이 절실했으므로 433년 비유왕과 눌지마립간 사이에 군사동맹이 맺어졌다. 그러나 이 동맹은 475년의 漢城함락을 고비로 동요하기 시작했다. 신라는 이 사건으로 인해 백제의 취약성과 고구려의 건재를 목격했던 것이다. 백제의 내정이 불안해지면서 양국 관계는 점차 역전되어 493년 동성왕과 소지마립간 사이에 신라 우위의 혼인동맹이 맺어졌다. 이후 신라는 동남방의 안정과 교역의 이익을 위해 加耶로 진출하는 과정에서 백제와 대립, 상쟁하였고, 마침내 553년 한강 하류역을 백제로부터 탈취하고 新州를 설치함으로써 120년 동안 이어진 백제와의 우호관계를 끝냈다. Silla needed the help of Baekje to escape from its restraints due to the interference of Goguryeo since the reign of King Naemul. Baekje also desperately needed a ally to prevent Goguryeo from advancing south. As a result, a military alliance was formed between King Biyu and Nulji in 433. However, the alliance began to tremble with the collapse of Hanseong in 475. Silla witnessed the vulnerability of Baekje and the existence of Goguryeo in the wake of the incident. Relations between the two countries gradually reversed as the internal affairs of Baekje became unstable. In 493, the Silla-preeminent marriage alliance was established between King Soji and Dongsung. Since then, Silla has advanced to Gaya confederation for stability and the benefit of trade in the southeastern region. In the process, she fought against Baekje. Silla finally ended 120 years of friendly relation with Baekje in 553 by seizing the downstream area of the Han River from Baekje and setting up Sinju, a new province there.