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Informational Disadvantage and Bargaining Power
고성혁,전병헌 한국계량경제학회 2009 계량경제학보 Vol.20 No.1
We consider an alternating offer model where the size of the to-tal surplus is stochastic. Furthermore, the size changes during the time when the offer is being considered. As a result the responder may obtain more information than the proposer. We analyze how the asymmetry in ability to access good information affects the bargaining power, both in terms of the resulting share and in terms of the delay in agreement.
고성혁(Seong-Hyuk Ko),윤봉규(Bong-Kyoo Yoon) 한국경영과학회 2020 經營 科學 Vol.37 No.1
It is challenging to respond to multiple fire requests during military operations. Many studies have attempted to tackle this problem as an optimization problem for fire time scheduling that minimizes the firing time. Meanwhile, infantry mortars in the battle have many unexpected targets than scheduled targets due to short fire range. Besides, there are various limitations for mortar positions that provide enough firing space as a large portion of the Korean peninsula is mountainous. In this study, the operation of mortar company was analyzed through a priority queuing model to provide an efficient structure of the company that minimizes fire response time considering geological characteristics of operations encountered by the Korea Army. A simulation model was also given to apply our model to the real situation as well as verify the analytic model.
[가솔린엔진부문] 자동차용 광촉매 시스템을 위한 조촉매 영향 평가
고성혁(Seong Hyuk Ko),손건석(Geon Seog Son),윤승원(Seung Won Yun) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As a promising catalyst reducing cold start emissions of automobiles, a photocatalyst system has been studied. Since the photocatalyst is only activated by UV wavelength light, it needs no heat energy like a conventional TWC, therefore no light-off time. However, as a cold temperature catalyst to treat cold start emissions of a vehicle, previous studies on characteristics of photocatalyst have room for improvement in terms of performance and durability subject to aging conditions and exhaust gas conditions.<br/> In this study, additive catalysts for photocatalyst have been investigated from the viewpoints of performance and durability improvement. Eleven different coating samples were prepared with the combination of six kinds of additives and two kinds of photocatalyst materials. Then these samples were aged with a hydrothermal aging process. The performance of these samples was measured on a model gas apparatus with simulated exhaust gases. The durability was also analyzed with XRD<br/>
FRP-연성재 적층복합체로 보강된 도시철도 개착식 터널 기둥의 내진보강효과
김두기,고성혁,김진영 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 논문집 Vol.14 No.6
최근 국내에서도 지진의 발생 가능성이 증가하는 추세이며 교량 및 터널 등의 시설물에 대한 지진과 같은 예상하지 못한 작용하중에 대한 안전성을 강화하고 있다. 특히, 1988년 이전 건설된 도시철도 시설물의 대부분은 내진설계가 반영되지 않아 지진하중에 대해 취약할 수 있으므로, 내진안전성에 대한 검토와 보강이 요구되고 있다. 이 연구에서는 도시철도 개착식 터널의 내진성능 향상을 도모하고자, 구조적 취약부분인 내측 기둥에 내진보강을 위한 새로운 FRP-연성재 적층복합체를 제안하였다. 적층조건에 따른 FRP-연성재 적층복합체에 대한 실험을 통해 재료물성치를 산출하여, 이를 근간으로 수치모델을 작성하였다. 수치해석을 통해 제안된 보강재로 보강된 RC기둥의 내진성능이 증대됨을 알 수 있었다. 또한 섬유보강재의 적층조건 (연성재의 종류, FRP 적층수, 섬유배향각)에 따라 성능 향상의 차이가 있는 것을 확인할 수 있었다. Recently the earthquake occurrences in Korea are likely to increase. Therefore, the facilities such as bridges and tunnels under the unexpected earthquakes need to be enhanced. Especially most of the subways previously built before 1988 have not been seismically designed, so their seismic safety requirements are required to be inspected and/or reinforced. In this study, the seismic reinforcement using FRP-ductile material layered composites was proposed to reinforce for the subway columns. Material properties of FRP-ductile material layered composites were calculated by laboratory tests considering the laminated conditions of the composites. Numerical simulations were performed using the experimental results of the specimens and the calculated properties of the composites. Seismic performance varied according to the types of composites: ductile material, number of layers, fiber orientations.
LDPE-나노 ZnO 복합필름의 기능성 및 재질안정성 평가
이우석,고성혁,Lee, Wooseok,Ko, Seonghyuk 한국포장학회 2018 한국포장학회지 Vol.24 No.1
In this work, nano ZnO was introduced into low density poly ethylene (LDPE) composites films with various contents (0, 0.5, 1.0, 3.0 and 5.0 wt%) by melt-extrusion. Their basic properties such as crystallinity, chemical bonds and surface morphology were examined by XRD, FTIR and SEM. XRD patterns and FTIR peaks intensity were increased in proportion to the ZnO contents. SEM images showed well dispersed nano ZnO in LDPE composite films. Antimicrobial functionality of LDPE-nano ZnO composite films was also studied and the presence of nano ZnO resulted in significant improvement of antimicrobial functionality compared to the pure LDPE film. To evaluate influence of nano ZnO on LDPE properties required as packaging material, thermal, mechanical, gas barrier and optical properties of LDPE-nano ZnO composite films were characterized with various analytical techniques including TGA, UTM, OTR, WVTR and UV-Vis spectroscopy. As a result, except optical and mechanical properties of LDPE, no significant effects were found in other properties. Opacity of pure LDPE was greatly increased with increasing concentration of nano ZnO and tensile strength was also improved at 0.5wt% ZnO content.
키토산-은나노 녹색합성 복합물질 적용 코팅지의 항균성 및 물리적 특성 평가
경규선,고성혁,양희태,이우석,박지명 한국펄프·종이공학회 2014 펄프.종이기술 Vol.34 No.4
We studied the green synthesis and antibacterial activity of paper coated with chitosan-silver (Ag) greennanocomposites for packaging applications. Green synthesis of Ag nanoparticles (AgNPs) was achievedby a chemical reaction involving a mixture of chitosan-silver nitrate (AgNO3) in an autoclave at 15 psi,121℃, for 30 min. AgNPs and their formation in chitosan was confirmed by UV-Vis spectroscopy, transmissionelectron microscopy (TEM) and dynamic light scattering (DLS). As-prepared chitosan-AgNPscomposite materials were coated on manila paper using Meyer rod. Surface morphology and Ag contentsin coating layer were characterized by field emission scanning electron microscopy (FESEM) and energydispersive spectroscopy (EDS). The mechanical properties such as tensile strength and elongation weresignificantly affected by coating with chitosan-AgNPs. The antibacterial test of coated paper was performedqualitatively and quantitatively against Escherichia coli (E. coli). It was shown to be effectivein suppressing the growth of E. coli with increasing Ag contents on the surface of coated paper and morethan 95 R (%) of antimicrobial rate was obtained at chitosan-AgNPs coated papers