프로젝트 선택모형에 관한 연구

어윤양 한국수산경영학회 1989 수산경영론집 Vol.20 No.2

양식선별효과에 관한 연구

어윤양,송동효 한국수산경영학회 2018 수산경영론집 Vol.49 No.1

Overstock in aquaculture is a matter of concern in aquaculture management. To sort fish based on fingerling size in case of overstocking is an important problem in aquaculture farm. This study aims to determine the amount of fry overstock and sorting time in aquaculture farm. This study builds a mathematical model that finds the value of decision variables to optimize objective function summing up the fingerling purchasing cost, aquaculture farm operating cost and feeding cost under mortality and farming period constraints. The proposed mathematical model involves following biological and economical variables and coefficients: (1) number of fingerlings, (2) sorting time, (3) fish growth rate and variation, (4) mortality, (5) price of a fry (6) feeding cost, and (7) possible sorting periods. Numerical simulation is presented herein. The objective of numerical simulation is to provide decision makers to analyse and comprehend the proposed model. When extensive biological data about growth function of fry becomes available, the proposed model can be widely applicable to real aquaculture farms. 본 연구는 양식장에서 밀식양식을 하는 경우의 논리적 타당성을 의사결정의 관점에서 분석하고 입식기단계의 밀식, 성장단계의 밀식, 판매 단계의 밀식으로 구분하였다. 본 연구에서는 입식단계 밀식문제를 생존율과 성장률에 관련된 생물적인 부분과 밀식 양식에 따른 치어비용, 사료비용, 운영비용등의 경제적인 부분으로 나누고 생물적 양식조건과 경제적 조건을 결합하여 밀식수준의 결정과 선별시기의 결정을 위한 비용방정식 모형을 구축하였다. 제시된 이론모형은 비선형으로 나타나는 성장함수와 생존율의 함수와 연계된 치어 비용, 사료비용, 운영비용이 비선형 함수로 목적함수에 나타나고 양식조건이 제약조건에 나타나므로 특별한 경우 외에는 일반해를 구하기 어렵다. 본 연구에서 이론적 모형의 성격을 분석하기 위하여 표준 수치모형을 설정하고 의사결정 변수와 모형계수에 대한 수치분석 시뮬레이션을 실행하였다. 본 연구의 한계와 향후 연구과제는 다음과 같다. 첫째 본 연구에서는 적용할 수 있는 대상어종을설정하고 현실성 높은 자료를 이용하여 분석을 하지 못하였다는 점이다. 이에 대한 추가적인 연구는본 논문의 성격과 직접적인 관계는 없지만, 연구의 유용한 적용 측면에서 필요할 것으로 생각된다. 앞으로 이러한 방향에서의 연구는 현실에서의 적용 측면에서 의미가 있을 것으로 생각한다.

수량할인가격 모형

어윤양 釜山水産大學校 1986 論文集 Vol.37 No.-

MIS에 있어서의 사용자참여의 유용성을 위한 다원적 접근

어윤양 釜山水産大學校 1987 論文集 Vol.38 No.-

다수목표 어선단 구성모형에 관한 연구

어윤양 한국수산경영학회 1990 수산경영론집 Vol.21 No.1

다단계 재고시스템에서의 서비스수준에 관한 연구

어윤양 한국수산경영학회 1999 수산경영론집 Vol.30 No.2

Some multi echelon inventory systems carry perishable products. The value of these product reduces as the period of time they spend in the system. In this paper We derive the necessary condition to determine optimal quantity, service level for a perishable product. The systems considered consist of two echelons and carry single item. To determine the optimal order quantity, the demand is assumed to be constant, the holding costs may be different in the echelons, and it allows no shortages. I assumed the price of product decreases by negative exponential function. To determine service level, following assumptions used in the model ·lead time is constant. ·demand is normal distribution. ·the product starts to perish at the second echelon. Service level is computed for different levels of lead times and for different variance of demands and for different price functions. The experimental results indicate that the service level in cost is a function of service level in demand and perishability of product. Results of the models exhibit that perishability and the age of the product are critical to determine the lot sizing and service level. -37

대형기저 양륙지 선정에 대한 연구

어윤양 한국수산경영학회 1987 수산경영론집 Vol.18 No.2

In the fish industry, the perishabiliy of raw material, saeasonality of catch and distance between production and consumption combine to cause physical distribution to be a difficult decision problem. In fishery physical distribution, the choice of appropriate landing port is a major problem. This paper deals with transshipment model to determine landing port as intermediate transfer point and the market to which fish should be sent. Transshipment model is useful to determine intermediate transfer point and can be reformulated as LP model. So this study developes transshipment model for korea large trawler and analized the model output. It can be expended to a realistic problem in order to provide information to port planner and decision maker on the trade-offs between the cost and efficiency of fishery transportation.

數量割引價格 模型

魚允洋 釜山水産大學校 1986 論文集 Vol.37 No.-

Traditionally, the determination of economic order quantity when quantity discounts are offered is treated from the viewpoint of the buyer. In this paper, the problem is dealt by considering the sellers viewpoint. The models are derived to determine the price break-even quantity, price discount rate and order quantity in conventional marketing channel. The models are applicable under some assumptions regarding the buyer's behavior, and for the case where, 1) Channel members are rational, so they behave to maximize profit. 2) Cost factors according to order quantity are set up cost, inventory holding cost, cost of product item and capital cost. 3) Consumer demand exhibits constant elasticity with respect to price. The results under the above assumptions are follows. 1) If seller want to increase buyer's order quantity, seller must discount price. 2) Seller increase the demand and profit by price discount in price competitive market 3) Total Costs of market channel decrease and total profits of market channel increase in case of price discount. Essentially, this paper analized the price discount as seller's strategical variable and discussed the effect of price discount in marketing channel.

우리나라 넙치양식 기술형태별 경쟁력 분석

어윤양(Youn Yang Eh),박영병(Young Byung Park) 한국수산경영학회 1997 수산경영론집 Vol.28 No.2

The objectives of this study are to find the competitive advantage of Bastard Halibut type. The results of analysis are as follows. First, in the profitability analysis, bastard halibut aquaculture using Herb is more profitable than other culture type. Second, bastard halibut aquaculture using Herb has more competitive power than other culture type in terms of cost, price, delivery, and flexibility. Finally, the result of comparison between culture type shows that culture technology must be concentrated on improving flesh of an adult fish. Research on the market differentiation methods in an adult fish are needed to analysis the competitive power analysis.

MIS에 있어서 使用者參與의 有用性을 위한 多元的 接近

魚允洋,趙顯玉 釜山水産大學校 1987 論文集 Vol.38 No.-

In the MIS literature, user involvement is considered as necessary condition for successful development of computerized information systems(CBIS), "User Involvement" refers to participation in the system development process by reprentatives of the target user group. In previous studies, it used to be believed that user involvement is effective to MIS success in connection with the theories of participative decision-making(PDM) and planned organizational change(POC). But the benefits of user involvement has not been strongly demonstrated in related studies. Having reviewed these studies, Ives and Olson concluded that problems with research to date fall into three categoires : theory(PDM, POC), measurement, and methodology. In order to increase understanding of the user involvement-system success relationship, we present the followings: a conceptual framework on the view of organizational innovation; a set of propositional hypotheses to be tested; some proposals for empirical test. In the first part of this paper, some limits of previous studies on the usefulness of user involvement are examined. Secondly, an alternative conceptual framework of user involvement based on organizational innovation theory is proposed, and some propositional hypotheses are suggested. Finally, for empirical reseach on this subject, we propose some critical points of the methodology and measurement.