상황인지 기반 최적화가 가능한 개인화된 모바일 웹서비스 구축을 위한 다중에이전트 접근법에 관한 연구

권오병,이주철 한국경영과학회 2004 經營 科學 Vol.21 No.3

Recently the usage of mobile devices which enable the accessibility to Internet has been dramatically increased. Most of the mobile services. however, so far tend to be simple such as infotainment service. In order to fully taking advantage of wireless network and corresponding technology, personalized web service based on user's context could be needed. Meanwhile, optimization techniques have been vitally incorporated for optimizing the development and administration of electronic commerce. However, applying context-aware optimization mechanism to personalized mobile services is still very few. Hence, the purpose of this paper is to propose a methodology to incorporate optimization techniques into personalization services. Multi agent-based web service approach is considered to realize the methodology. To show the feasibility of the methodology proposed in this paper, a prototype system, CAMA-myOpt(Context-Aware Multi-Agent system for my Optimization), was implemented and adopted in mobile comparative shopping.

정상교합자의 치열궁 형태

권용철,성정옥,권오원,성재현 대한치과교정학회 1989 대한치과교정학회지 Vol.19 No.1

This study was designed to investigate dental arch shapes buccally and lingually at Bracket Level of Koreans. This involved studying 63 inviduals (37 males, 26 females) with normal occlusion ranging in age from 17 to 24 yesrs old. The landmarks were digitized and measurements and statistical analysis were performed by NEC 9801 V-M computer. The Results were as Follows: Bicanine width, Bipremolar width and Bimolar width were larger in males than in females. Buccal and lingual arch form and coordination form were obtained by NEC 9801 V-M computer. The parabolic equations which represents buccal and lingual arch form were obtained.

시클로펜틸아렌술포네이트 및 시클로헥실아렌술포네이트와 아닐린과의 친핵성치환반응

吳爀根,趙仁鎬,申哲昊,權永峰 全北大學校 1993 論文集 Vol.35 No.-

The nucleophilic substitution reactions of cyclopentylarenesulfonates and cyclohexylarenesulfonates with anilines in acetonitrile at 65.0℃ are investigated. The cross-interaction constants ρxz(and βxz) between substitue-nts in the nucleophile(X) and leaving group(Z) are positive and have relatively small mmagnitude. The transition state(TS) variation is consistent with that predicted by the More O'Ferrall-Jencks diagram as expected from the positive ρxz. The small magnitude of ρxz correctly refrects a relatively loose TS structure in contrast to the tight TS for primary alkyl derivatives under similar reaction conditions.

화학기상응축법으로 제조한 Fe-Co 나노입자의 구조 및 자기적 상태에 관한 뫼스바우어 분석

오세진,최철진,권순주,진상호,김병기 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.7

Nine nano-sized Fe-Co particle samples synthesized by Chemical Vapor Condensation(CVC) were analyzed using Mo¨ssbauer spectroscopy, XRD, BET and HRTEM. The synthesized nanoparticles consisted of metallic core and oxide shell structures, and their surfaces were covered with a-FeOOH, γ-FeOOH and Fe_(3)O_(4). The increase of cobalt content enhanced magnetic field. However, when the decomposition temperature and the oxygen content in the carrier gas (Ar) increased, the magnetic field of nanoparticles reduced with decreasing the average particle size. with increasing the vacuum pressure, the average particle size and the magnetic field increased.

Ti-IF강의 재결정 집합조직의 발달에 관한 연구

권오철,이병영 大田産業大學校 2001 한밭대학교 논문집 Vol.18 No.-

Many studies have been investigated on the development of recrystallization texture in Ti-IF(Interstitial Free) steel sheets using panel of automobiles. The recrystallization texture formation of Ti-IF steel depends on the aspects of the nucleation and growth of recrystallization grains. The major r-fiber (<111>//ND(Normal Direction)) originates from the similar orientation of deformed grains and the minor near {110} grains from transitional band, near {100} grains form unrecovery deformed grains in cold rolled matrix. In the primary stage of recrystallization the rotation angle about the <001> axis between adjacent grains detected by EBSP(Electron Back Scattering Pattern) method has about 88˚. The frequency of <001> misorientation axis decrease with annealing temperature in a series of <110>//RD(Rolling Direction) grains, while the frequency of <013> and <113> misorientation axis increase in an series of <111>//ND grains. The frequency of <123> misorientation axis increasing a bit more steadily, and misorientation axes shows a changing from <001> axis to <013> and <113> axis.

600합금의 미세조직 변화 및 SCC거동에 미치는 Ce 첨가의 영향

권오철,이용선,임연수,정만교,김정수 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.1

High purity model alloys with major composition Ni-15Cr-9Fe-0.03C (600CEO) and Ni-15Cr-9Fe-0.03C-0.04Ce (600CE4) were produced. Using these model alloys the effect of alloying element Ce on the SCC behavior of Alloy 600 was evaluated in a caustic solution. To obtain carbides precipitated on grain boundaries, the thermal treatment was performed on both the solution annealed model alloys. Microstructural examinations using SEM and TEM EDX showed that the same structural carbides, Cr_(7)Cc₃, were precipitated on both the alloys and no significant difference in the amount of Cr depletion along grain boundaries was observed between the two model alloys. However, it was shown that the coverage of grain boundary carbides was higher in the Ce-bearing alloy (600CE4). The SCC susceptibility of the alloys was investigated in 40%NaOH solution at 315℃. Being evaluated in terms of the maximum crack depth, the SCC susceptibility of the alloy turned out to be reduced by the addition of Ce. The increased resistance to the SCC in the alloy 600CE4 was considered to be attributable to the increased coverage of grain boundary carbides. (Received September 30, 2004)

部分的 合理期待模型과 財政金融政策의 動態的 效果

權五哲 동국대학교 경영대학원 1991 經營論叢-東國大學校 經營大學院 Vol.15 No.-

This paper investigates effects of monetary and fiscal policies in a partially rational expectation model. In a partially rational expectation model, money is not neutral, money is not neutral and fiscal policy shows partial crowding-out effect. These conclusions will please the heart of Neo-Keynesians. However, conclusions derived by the traditional model are still important. And conclusions derived by the partially rational expectation model are also important for policy makers.

설비예방보전을 위한 TBM의 최적보전주기 설정모델 연구

권오운,이홍철 한국경영과학회 2003 한국경영과학회 학술대회논문집 Vol.- No.1(1)

The purpose of this research aimed at performing the easy design, and also the easy on-the-job application of the maintenance interval determination methodology by presenting the determining model of the optimizing maintenance interval in TBM for the preventive maintenance of facilities TBM(time-base based maintenance) as the preventive maintenance requires the adequate determination of the maintenance interval. The maintenance interval of TBM shall be applied differently for the each interval such as the patrol inspection, maintenance, overhaul inspection, exchange. And it is based on the composition level of equipment. The already informed theories of interval determination methodology for the patrol inspection, repair, and overhaul inspection are difficult for adopting because of the several restriction problems in applying in the maintenance schemes as the theory. So, the model for determining the optimizing exchange interval of part, maintenance interval of auxiliary machine, unit equipment, etc. was presented to apply in the maintenance easily and appropriately.

지하 공동에 대한 탄성파 속도 및 진폭 변화에 관한 연구

이상철,오석훈,손권익,서백수 강원대학교 산업기술연구소 2007 産業技術硏究 Vol.27 No.A

This study was designated to clarify the aspect of the wave propagation around the cavity. The change of traveltime and amplitude of the seismic wave was observed according to the various wave velocities of the cavity. The seismic wave detour or penetrate the cavity depending on the seismic velocity of the in-filled material. Generally, seismic wave detours toward high velocity zone around the cavity, and when the velocity of the cavity material reaches to 80 % of the base rock, the wave penetrates the cavity. The traveltime of the detouring seismic wave is not sensitive to the change of the cavity velocity, but as the velocity of the cavity increases, the fall of the amplitude was reduced. The penetrating wave showed the steeply increasing amplitude due to the reiteration of the detouring wave.

팔당호의 부영양화 실태

김범철,김동섭,권오길 江原大學校 附設 環境硏究所 1990 環境硏究 Vol.7 No.-

Trophic states were surveyed in a reservoir on the Han River, Lake Paldang, receiving waters from two rivers, the North Han River and South Han River. Chlorophyll a concentration, secchi disc transparency, BOD, soluble reactive phosphorus (SRP) concentration and total phosphorus (TP) concentration were investigated at three sta-tions (dam site and the inlet region of the North Han River and the inlet region of the South Han River) and the phosphorus loading into Lake Paldang was measured. Chlorophylla, BOD, SRP and TP were highest at the inlet region of the South Han River and lowest at the inlet region of the North Han River and eutrophic level at the inlet region of the South Han River. The phosphorus loading into Lake Paldang was between the dangerous critical loading and the permissible critical loading of Vollenweider-OECD critical loading model. The phosphorus loading of the South Han River was about 2 times larger than of the North Han River.