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윤문길,정대영,이신수,이혜영 한국경영과학회 2000 한국경영과학회 학술대회논문집 Vol.- No.2
Dongdaemoon clothes market can make traditional commerce to improve problems which happen to traditional commerce and satisfy between customers and salers through combination among Electronic Commerce which is growing up in 21 centuries place innovation This thesis is focusing on suggesting strategies which practice to let Dongdaemoon clothes market customers and wholesalers, retailers to use Electronic Commerce as strategic skills by analyzing core successful factors for adopting Electronic Commerce in Dongdaemoon clothes market. Adopting Electronic Commerce in Dongdaemoon clothes market when the customer make a reservation and the salers provide the customer with discounting service, the customer was willing to but it. Internet service categories which affect customer's satisfaction are providing lots of product information. This thesis shows providing information made the customer to increase customers's satisfaction degree and buying intention. Also convenience of product research, and reliability in transaction process can enable the customer to increase transaction reliability. These factors are very important in Electronic Commerce. In addition, factors which show customer's suggestion and incovenience by using best seller information and discounting service board when they buy some items in Dongdaemoon clothes market affect the customer satisfaction degree and satisfaction degress of providing information. However, this thesis is analyzed that reliability of transaction process doesn't affect all successful factors such as product quality, size, online payment system, price reliability.
Dynamic Plasma Screening Effects on Electron-ion Collisions in Dense Plasmas
윤정식,김형관,정영대 한양대학교 이학기술연구소 1999 이학기술연구지 Vol.1 No.-
고밀도 플라즈마 내에서의 전자-이온 충돌여기 그리고 제동복사 현상이 미치는 동적 플라즈마 가림효과를 연구하였다. 전자-이온 상호작용 포텐셜은 플라즈마 유전함수를 도입하여 사용하였다. 직선궤도 방법을 사출입자의 궤도에 적용하였다. 동적 플라즈마 가림효과를 포함한 전이확률이 정적 플라즈마 가림효과를 포함한 전이확률보다 항상 큰 값을 갖는 것을 알 수 있었다. 또한 동적 플라즈마 가림효과를 포함한 제동복사 미분 산란단면적이 정적 플라즈마 가림효과를 포함하고 있는 제동복사 미분 산란단면적보다 항상 크다는 것을 알 수 있었다. 사출입자의 속도는 전자의 열적속도보다 작을 경우, 동적 분극 가림효과가 정적 플라즈마 가림효과로 되었다. 그러나, 사출입자의 속도가 전자의 열적 속도보다 클 경우, 상호작용 포텐셜은 거의 가려지지 않는 것을 알 수 있었다. Dynamic plasma screening effects are investigated on electron-ion collesional excitation and Coulomb bremsstrahlung processes in dense plasmas. The electron-ion interaction potential is considered by introduction of the plasma dielectric function. The straight-line trajectory method is applied to the path of the projectile electron. The transition probability including the dynamic plasma screening effect is found to be always greater than that including the static plasma screening effects. It is found that the differential bremsstrahlung radiation cross section including the dynamic plasma screening effect is also greater than that including the static plasma screening effect. When the projectile velocity is smaller than the electron thermal velocity, the dynamic polarization screening effect becomes the static plasma screening effect. However, when the projectile velocity is greater than the electron thermal velocity, the interaction potential is almost unshielded.
단체수요를 고려한 서비스산업의 수익관리 최적화 모형에 관한 연구 : 항공사 수익관리 모형을 중심으로 An Application Airline Industries
정대영,윤문길 한국항공대학교 경영연구소 2000 경영연구 Vol.7 No.2
수익관리(Revenue Management)는 공급과 수요관리의 문제점을 해결하기 위한 새로운 접근방법으로서 시장에서의 수요와 공급을 적절히 조절함으로써 수익을 최대한 시키는 경영기법이며, 경영과학분야와 실무적으로는 항공사 및 기타 소멸성 자산(Perishable-Asset)을 운용하는 서비스 기업에 빠르게 확산되고 있는 분야중의 하나이다. 본 연구에서는 할인요금에 대한 좌석할당에 있어서 미래에 발생할 수 있는 정상요금 예약의 기대수익보다 현재 요구된 할인요금의 수익가치가 더 크다면 할인요금 예약은 수용되어야 한다고 Littlewood[42]가 제안한 복수요금형태에 기반을 둔 좌석재고 통제규칙을 기초로 동적 계획법(DP: Dynamic Programming)의 특성을 고려하여 재고통제를 위한 수익관리기법에 관한 연구를 수행하였다. 모의실험은 제시된 최적화 모형과 판매허용용량을 정하여 허용가능 용량내에서 판매가능 여부를 결정하는 표준형 네스팅 방식을 통한 매출액의 비교를 실시하였다. Revenue management is a method that can help a firm sell the right inventory unit to the right customer at the right time and for the right price. It guides the decision of how to allocate undifferentiated units of limited capacity to available demand in a way that maximizes profit or revenue. This paper examines the problem of proper(optimal) control over the seat allocation on flight. We formulate and analyze a Markov Sequential Decision Model for airline revenue management on multiple-price by considering a simple form of airline group demand. Our model allows cancellation, no-show and overbooking. In this paper, we make assumptions on a single-leg flight but not on the arrival patterns for the various fare classes. As a result of Simulation, our numerical examples show that revenue gains of up to 9% are possible with our model, compared with an standard nesting method. It is demonstrated that our model is valid and possible application to airline industry and applicable to other problem of revenue management with perishable service or product such as ISP, Cruise, hotel, Mobile terminal with very short Product life cycle. The purpose of this paper has been not so much to provide a model for a specific airline industry, as to indicate the nature and significance of the general service industry problem and to demonstrate one approach, and its shortcomings, for resolving it. It is hoped that the presentation of these results will stimulate additional research, either along the lines suggested or in new directions, for what appears to be an important and pressing decision problem.
Ruled Surface로 형성된 임펠러 블레이드의 5-축 가공에 관한 연구
정대일,조현덕,윤문철,최두선,신보성,이응숙 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-
This paper describes the method and the process for impeller machining on 5-axis CNC machining center. Also, The CAD/CAM software for the impeller post processing is developed. The software can be interfaced with Solid-works software for confirmation of the impeller shapes. In this study, blades on impeller is described from Ruled-surfaces between two Ferguson curves. In this study, using 5-axis NC part program obtained from the developed software, a sample impeller was machined on 5-axis CNC machining center. The machined impeller was very agreeable to the designed impeller. Thus, theories proposed in this study can be very useful for the 5-axis machining of impeller blades with Ruled-surfaces.
황종대,정윤교 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
This research presents a modeling and a manufacturing method of insert type milling cutters such as face cutter, flat endmill and ball endmill. The methods introduced in this paper adopts the multi-tasking 5-axis machining that is increasing machining accuracy of holder and position accuracy of bolting points. So this can be used in the basic document of the total package program that involves modeling and manufacturing module in various insert cutters.
서정길,김찬희,배윤정,문호성,김근용,박희연,윤호동,김창훈,변대석,홍용기,박남규 한국어병학회 2003 한국어병학회지 Vol.16 No.3
Mastoparan B (MPB)는 벌독으로부터 정제된 양친매성α-helical 구조를 취하면서 14개의 아미노산 잔기로 구성된 염기성 항균성 펩타이드로서 여러 가지 생물막과 작용한다. 본 연구에서는 우리 나라 연안의 적조 (HABs, harmful algal blooms)를 일으키는 4종의 적조생물 (Alexandrium tamarense, Chattonella catenatum)에 대한 MPB의 살조효과를 조사하였다. MPB의 4종의 적조생물에 대한 살조효과는 31.3㎍/㎖에서 세포의 lysis또는 ecdysis와 같은 형태로 현미경으로 관찰할 수 있었다. 또한 MPB는 C. marina 및 C. polykridorides에 대해서 A. tamarense와 G. catenatum보다 더욱 강한 살조효과를 나타내었다. 이러한 MPB의 HABs에 대한 살조효과연구는 새로운 살조물질을 개발하기 위한 자료가 될 것으로 생각된다. Mastoparan B (MPB), an antimicrobial cationic peptide isolated from the venom of the hornet Vespa basalis, is a basic amphipathic a-helical peptide composed of fourteen amino acid residues. In this study, we have investigated the algicidal effect of MPB against hatmful algae blooms (HABs) casative Alexandrium tamarense, Chattonella marina, Cochlodinium polykrikoides and Gymnodinium catenatum. The algicidal effect of MPB showed in the concentration of 31.3 ㎍/㎖ to 500 ㎍/㎖ against 4 HAB species and observed cell lysis or cell ecdysis by microscopy. MPB reacted more sensitive to C. marina and C.polykrikoides than A. tamarense and G. catenatum. The algicidal study of MPB against HABs will provides much insight into development of new algicidal substances.