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성공적인 eCRM, CRM을 위한 유전자알고리즘의 혼합 초기화법을 이용한 데이터마이닝
강래구,김승언,정채영 朝鮮大學校 統計硏究所 2006 統計硏究所論文誌 Vol.8 No.1
고객관리가 기업의 성패를 좌우하는 중요한 화두로 떠오르면서 보다 쉽고 편리하게 고객의 다양한 Pattern을 발견하고 예측하기 위해 많은 기업들이 CRM과 eCRM을 빠르게 도입하고 있다. 과거엔 고객관리가 통계학자들이나 전문적인 통계패키지에 의해 관리되어 왔으나 IT 분야의 급격한 발달을 기반으로 통계적 과정을 자동화시킨 Data Mining 기법으로 점점 대체되고 있는 추세이다. 이러한 Data Mining이 대표적으로 이용되고 있는 분야가 CRM, eCRM이다. Genetic Algorithm을 이용하여 Data Mining을 적용함에 있어서 본 논문에서는 무작위 초기화법과 유도된 초기화법을 동시에 사용하는 새로운 집단 초기화 방법을 적용하여 A할인점의 2004년과 2005년도 우수고객을 예측하였고 실제 고객 데이터와의 비교를 통해 본 논문에서 제안한 새로운 집단 초기화 방법의 성능을 입증하였다.
姜來撤 홍익대학교 경영연구소 2007 경영연구 Vol.32 No.-
Generally accepted accounting principle is based on gomg concern assumption. However the earnings information's informativeness will be lowered when the firm have going concern problem. To obtain the empirical evidence on this reasoning, this article analyzed effect of the firm's default risk on accounting earnings' role as source of useful information. The article analyzed the capital market participants' interpretation of earnings information of the firm that have financial problem. Default risk is measured with audit opinion and considered the firm which received going-concern modified opinion as having high default risk. The empirical evidence was consistent with the inference that market's response on earnings information will be lowered when the audit opinion is modified for going concern problem.
전단류 안에서 운동하는 원주주위의 압력분포에 관한 연구
조강래,고철교 연세대학교 산업기술연구소 1980 논문집 Vol.12 No.2
The purpose of this paper is to investigate the pressure distribution around a circular cylinder which moves perpendicularly to a uniform shear flow. The assumption made here is that a flow is an incompressible and inviscid one. As a result of theoretical calculations the influence of a shear flow on a pressure distribution of a stationary cylinder appears more on the side of the cylindrical surface facing to higher velocity than to lower velocity of a shear flow. The variations of a total pressure coefficient, an indication angle of stagnation point and an indication angle of a static pressure become greater as the vorticity of a shear flow becomes large and also the velocity of a cylinder becomes rapid. Finally the fact that the influence of a shear flow on a pressure distribution is amplified by viscous effects was recognized by an experimental result at a low Reynolds number smaller than critical Reynolds number.
외압을 받는 공기윤활 저어널베어링의 부하용량에 관한 이론적 연구
조강래,김수태 國立 昌原大學校 産業技術硏究所 1988 産技硏論文集 Vol.2 No.-
A theoretical investigation is carried out for the load capacity of the externally pressurized air lubricated journal bearings. Theoretical analysis is made using the incremental method and the finite element method, and the discharge coefficient is considered. The present numerical results for the bearings having one row and two rows of supply holes with pocket are obtained and compared with any other numerical and experimental results. From this study, the following results are obtained. 1. The present numerical results for the bearings having one row and two rows of supply holes with pocket are in better agreement with the avalable experimental results than any other earlier numerical results. 2. The discharge coefficient used in the bearing with two rows of supply holes with pocket in static state can be effectively applied to the bearing with one row and two rows of supply holes in rotating state respectively. 3. The inconsistency appeared in Pink and Stout that the load capacity decreases at high eccentricity ratio in the theoretical results for the bearings at static state, is corrected in present study.
趙江來,愼英晳 연세대학교 산업기술연구소 1986 논문집 Vol.18 No.1
In this study, the flow in the centrifugal pumps is analyzed by the vortex panel method. The flow is assumed to be inviscid and incompressible. To stabilize the fluctation of the computations, linearly varying vortex is used on each panel. Distributions of vorticity, velocity and pressure on the impeller with and without casing are calculated. The results are in good agreement with that of Kamimoto.
축류 회전차 후방의 2차유동과 후류에 관한 실험적 연구
조강래,주원구,박희봉 연세대학교 산업기술연구소 1988 논문집 Vol.20 No.1
The measuring system controlled by microcomputer was constructed in order to measure the three dimensional flow field behind an axial flow compressor rotor. Detailed measurements were made of the flow field behind an axial flow rotating blade row using this system and a 45°single slanted hot wire. The interaction of the wake with the annulus wall boundary layer, the secondary flow and the tip leakage flow results in slower decay and larger width of the wake. By the mixing of the wake with the strong secondary flow at the corner between the hub wall and the suction side, the wake near the hub wall has the largest width and the largest axial velocity defect. The reduction of the mass flow rate entails separation, stall and larger tangential velocity. In particular, as leakage flow become strong, it absorbs the wake and affects the flow at the full passage near the casing wall.
軸流壓縮機 回轉車內의 粘性流動 損矢을 고려한 3次元 流動計算에 關한 硏究
趙江來,方寧錫 연세대학교 산업기술연구소 1988 논문집 Vol.20 No.1
A Numerical Calculation has been performed for the analysis of three-dimensional flow fields in the rotating cascade. This analysis is one of the most important part of the aerodynamic design of rotating blades in axial-flow compressors. Three-dimensional flow fields can be obtained by the quasi-three-dimensional iterative calculations of flows both on blade-to-blade stream surfaces and hub-to-shround stream surfaces, the former is solved by the method of boundary streamline correction, the latter with the consideration of viscous flow losses. Conclusions are obtained as follows: (1) The method of boundary streamline correction has been proved to be accurate one for the calculation of the high subsonic compressible blade-to-blade flows. (2) For the prediction of performance at off-design points, the results of calculation of hub-to-shroud are effective if the calculation is performed with the proper consideration of losses due to viscous flows.
이종선,김엽래,이강손 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.4
This paper is to estimate sizing design sensitivity of linear and nonlinear vehicle frame structure using structural analysis result from ANSYS. Using design sensitivity results, optimal design of plane vehicle frame structure with buckling constraint is carried out the gradient projection method. Optimal design results are compares gradient projection method result with SUMT result.