인터넷 쇼핑몰의 서비스 품질에 대한 동태적 자원배분 의사결정

곽수일 ( Soo Il Kwak ),최강화 ( Kang Hwa Choi ),김수욱 ( Soo Wook Kim ) 한국품질경영학회 2005 품질경영학회지 Vol.33 No.4

단일시설에 의한 다품종소량생산의 생산계획에 관한 연구

곽수일,이광수,원영종,Kwak, Soo-Il,Lee, Kwang-Soo,Won, Young-Jong 한국국방경영분석학회 1976 한국국방경영분석학회지 Vol.2 No.2

There are many cases of production processes which intermittently produce several different kinds of products for stock through one set of physical facility. In this case, an important question is what size of production run should be produced once we do set-up for a product in order to minimize the total cost, that is, the sum of the set-up, carrying, and stock-out costs. This problem is used to be called scheduling of multiple products through a single facility in the production management field. Despite the very common occurrence of this type of production process, no one has yet devised a method for determining the optimal production schedule. The purpose of this study is to develop quantitative analytical models which can be used practically and give us rational production schedules. The study is to show improved models with application to a can-manufacturing plant. In this thesis the economic production quantity (EPQ) model was used as a basic model to develop quantitative analytical models for this scheduling problem and two cases, one with stock-out cost, the other without stock-out cost, were taken into consideration. The first analytical model was developed for the scheduling of m products production through a single facility. In this model we calculate No, the optimal number of production runs per year, minimizing the total annual cost above all. Next we calculate $No_i$, the optimal number of production runs per year, for each product as if it were an independent product without the facility-sharing constraint. Then, for products in which $No_i$ is significantly different from No, some manipulation of the schedule can be made by trial and error in order to try to fit the product into the basic (No schedule either more or less frequently as dictated by) $No_i$. But this trial and error schedule is thought of inefficient. The second analytical model was developed by reinterpretation of the calculating process of the economic production quantity model. In this model we obtained two relationships, one of which is the relationship between optimal number of set-ups for the ith item and optimal total number of set-ups, the other is the relationship between optimal average inventory investment for the ith item and optimal total average inventory investment. From these relationships we can determine how much average inventory investment per year would be required if a rational policy based on m No set-ups per year for m products were followed and, alternatively, how many set-ups per year would be required if a rational policy were followed which required an established total average inventory investment. We also learned the relationship between the number of set-ups and the average inventory investment takes the form of a hyperbola. But, there is no reason to say that the first analytical model is superior to the second analytical model. It can be said that the first model is useful for a basic production schedule. On the other hand, the second model is efficient to get an improved production schedule, in a sense of reducing the total cost. Another merit of the second model is that, unlike the first model where we have to know all the inventory costs for each product, we can obtain an improved production schedule with unknown inventory costs. The application of these quantitative analytical models to PoHang can-manufacturing plant shows this point.

한국농촌지역 마을수준 자생조직체를 활용한 일차보건의료사업의 효과에 관한 실험적 연구: 방법론적 접근

홍여신 ( Yeo Shin Hong ),이은옥 ( Eun Ok Lee ),곽수일 ( Soo Il Kwak ),이선자 ( Seon Ja Rhee ),김광웅 ( Kwang Woong Kim ) 서울대학교 간호과학연구소 1986 간호학 논문집 Vol.1 No.1

컴퓨터 시스템 作業計劃에 관한 硏究 : 注文生産 計劃 接近方法을 中心으로 a heuristic approach

郭秀一,李慶煥 東亞大學校 經營問題硏究所 1981 經營論叢 Vol.4 No.-

The purpose of this study is to find effective scheduling rules, with job shop approach, which can be used practically and give us effective scheduling for com- puter system operation, to minimize the sum of lateness job or failing this the sum of lateness times is minimized. in order to lay out a schedule we need a rule or set of rules. Sinse the sche- duling problem is one of determining precedence or ordering in time among a number of jobs, an operation scheduling rules includes a means of determining priorities of jobs. The scheduling rule (or complex of rules) may do more than this, for example, it may say: schedule the job with the least slack, but if this forces another job to be late then schedule other job instead. In this study following scheduling rules (priority dispatching rules) are used. 1) Minimum job slack 2) Minimum job slack per operations 3) Minimum job slack ratio 4) Length of next operation(shortest imminent operation) 5) Minimum length of next operation together with job slack ratio 6) Shortest out-put time (since most of queue occurs on line priter) 7) First come, first served. Also two alternate operation rules (heuristics) which anticipate the progress of a scheduling are incorporated with those rules, which are alternate operation 1, and alternate operation 2. 1) Alternate operation 1; When scheduling a job according to priority dispatching rules, in case a critical job occurs (that is, see if the job slack of any other job has just become negative, or if positive, has reached certain critical level), schedule that job, and the job selected by priority dispatching rule will be scheduled the next times. 2) Alternate operation 2; When a job is selected by scheduling rules or alternate operation 1, and the job still meet its due times. In case it may be also anticipated that a critical job may be arrived to those machine, on which the job selected by scheduling rules or alternate operation 1 is still being processed, then schedule this critical job first. The approach is simulative in that the operation of computer system is simulated in a FORTRAN program. The results of this study are following. 1) priority dispatching rules based on the job slack in some reasonable way are more effective than other rules. 2) There are little choice between rules in some reasonable way upon job slack, so simple rule (for example, job slack ratio) should be used. 3) In case the measure of performance is to minimize sum of lateness jobs, there are little choice between rules based on job slack and shortest output time rule, so shortest output time rule rather used since it is more simple than job slack rules. 4) In case the rules based on shortest process time are bolstered by alternate operation I are more effective. 5) In accordance with the measure of performance, there are some variation in performance of schduling rules. For example with 'minimize sum of late- ness times',the order is rule 5, (1,2), 3, 4, 6, 7 according to increasing lateness times, but with 'minimize sum of lateness jobs', the order is rule 4, (1,2), 6, 5, 3, 7 when blined use of the scheduling rules. 6) 'First come, first served' rule is less effective than other rules. Hence when scheduling for computer system operation, priority dispatching rule based on the job slack and shortest output time rule are more effective than other rules. So it is desirable to use these rules. In case multiprogramming it will be more effective to place the job on high priority partitions which has minimum job slack or minimum output time, since the job placing on higher priority partitions can be processed more rapidly than on lower priority partitions.

中小製造業의 適正規模에 관한 硏究

郭秀一,崔應淳 東亞大學校 經營問題硏究所 1982 經營論叢 Vol.5 No.-

韓國技術人力需給시스템의 動的 特性에 관한 硏究

郭秀一,吳相洛,申鉉麟 東亞大學校 經營問題硏究所 1980 經營論叢 Vol.3 No.-

An Experimental Study on a Model Primary Health Care Program in Korean Rural Communities Utilizing Village Level Self-Care Substructure: Methodological Aspects

Rhee, Seon Ja,Lee, Eun Ok,Hong, Yeo Shin,Kwak, Soo Il,Kim, Kwang Woong 서울대학교 간호대학 간호과학연구소 1986 간호학 논문집 Vol.1 No.1

본 연구는 일차보건의료사업의 전달 및 운영에 관한 문제를 과학적이고 분석적인 접근방법에 의해 살펴보고 운영상의 문제를 해결할 수 있는 방법을 제시하고저 시도되었다. 구체적인 목적으로서 한국의 보건진료원 제도를 중심으로 한 일차보건의료사업 전달체계의 운영상의 문제를 분석, 파악하고 지역사회 자생조직을 하부조직으로 활용할 것을 대안으로 하여 각 대안의 타당성을 사업효과의 평가방법으로써 증명하는 접근법을 제시하고저 한다. 본 연구는 1983년 1월부터 실시되고 있으며 기본 연구설계는 두군의 실험군과 한개의 대조군으로 형성된다. 제1실험지역(양평군)에서는 공식적 자생조직인 반상회를 통해 연구 프로그램이 투입되고 제2실험지역(이천군)에서는 비공식적 자생조직인 새마을 부녀회, 자모회, 친목회, 종교단체, 종친회등을 통해 연구프로그램이 투입된다. 대조군(안성군)에서는 평상시와 동일하게 사업이 이루어지며 연구프로그램은 투입하지 않는다. 각 실험지역과 대조지역간의 효과의 차이를 규명하기 위한 체계적 자료수집 방법으로써 1) 각군의 5개면에 거주하는 지역주민의 1/5의 비율로 표본을 설정하여 실험 전후로 가구조사를 실시한다. 2) 보건진료원과 지역사회 지도자들의 월별 활동기록을 통해 그들의 활동의 변화의 추이를 파악한다. 상기목적에 따라 수집한 자료의 분석방법으로서 다음 세가지 방법을 제시하였다. 1) 실험집단별 실험전후의 도수, 평균, 및 백분율의 차이를 비교하는 방법 : 2) 시물레이션모델(Simulation Model)을 이용하여 분석하는 방법: 3) 비용과 효과의 비율을 비교하는 방법이다. 상기방법을 이용한 분석결과는 별도로 발표될 예정이다. 결론적으로 생명을 구하고 인류의 고통을 공감할 수 있는 많은 지식의 축적에도 불구하고 보건의료사업전달의 비효과적인 운영에 의해 발전된 의료과학이 국민보건향상에 크게 기여하지 못하고 있는 실정에 감안하여 기초적 의료 연구 못지 않게 보건의료 운영의 실제문제해결을 위한 연구의 필요성이 강조되어야 하며 이러한 운영연구 방법으로서 본 논문의 연구접근의 타당성이 증명되었다. The objective of this study was to identify various methods to contrast the feasibiliity and effectiveness of Primary health Care (PHC) programs that use non-health community organizations as substructures for providing PHC services. Basically, this study is a quasi-experimental field test of three possible solutions to the productivity problem: 1) the current community health practitioner service delivery pattern (control group); 2) service delivery involving formal community organization (experimental group I); and 3) service delivery involving non-formal community organization (experimental group II) as substructures for delivering primary health care services. The objectives of the solution are to maximize: 1) improvement in health indices; 2) the productivity of community health practioners in terms of services delivered; and 3) efficiency in terms of costs incurred and coverage attained. The decision variable is the type of community organization participating in the program. For this quasi-experimental field test study, a sample of five townships in each of three counties was chosen by non-random methods based on certain essential study criteria. Data with which to evaluate each solution's impact on the objectives is were derived from two sources: a household survey and community health practitioner's written record. The household survey was done as a baseline at the start of the field test and again at its conclusion. Community health practitioner's service records were collected continuously in monthly activity checklist form for the period of fifteen months. Techniques employed for the comparison of results from three countries were trifold. One technique was simple inter-group comparison with pre-post quantitative comparison. The second was simulation technique, and the third was cost-effectiveness analysis. For the quantitative comparison only simple analysis methods such as frequencies, means and percentage distributions were used. System Dynamics(S.D.) as a simulation model was used in the analysis of the utilization pattern of health services for its effectiveness for the analysis of a complex and dynamic system such as PHC system. PHC system model was built with five subsystems plus an education subsystem as an experimental input system. There were fifty-six identifiable built-in variables in each subsystem. Cost-effectiveness analysis was designed to identify the productivity of the community health practitioner in terms of cost incurred, the quantity of the services produced and the effectiveness of the primary healthe care programs on the basis of the selected indices of health services