• 산업공학
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• 제17권1호
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• pp.56-70
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• 2004

Expanding product variety and high customer service provision place an enormous burden on demand forecasting and the matching of supply with demand in a supply chain. Postponement of product differentiation has been found to be powerful means to improve supply chain performance in the presence of increasing product variety. Delaying the point of product differentiation implies that the process would not commit the work-in-process into a particular finished product until a later point. This paper reviews the recent analytical models that quantify the value of delayed product differentiation. We conclude the literature review by summarizing and synthesizing the economic evaluation of the postponement and outline directions for future research.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2000년도 춘계학술대회 논문집(Proceeding of the KOSME 2000 Spring Annual Meeting)
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• pp.146-152
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• 2000

As an improvement in the standard of living and economic growth the demand for air conditioning equipment is increasing rapidly. Nowadays air conditioning equipments are being used for industry large building house and car. Thess equipments was concentrated on improving heat efficiency of economic aspects while they design heat exchanger for cooling and heating,. These air conditioning equipments using heat exchanger cause a discomfort to user due to generating mist at the beginning of operating. Therefore the user demand air of high class and quality. In this experimental study to acquire elementary data for development of heat exchanger which be able to supply air of high quality that is to say possess a restraint effect of mist generation. We estimate an effect on cooling plate kind supply air velocity supply air temperature cooled plate temperature and supply air relative humidity which have an influence on outlet air condition of heat exchanger.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2014년도 전력전자학술대회 논문집
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• pp.93-94
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• 2014

Recently, According to increase of power demand, it was increased a demand that switching power supply have characteristic of low-loss and high-efficiency. So increase of using device, the failure rate increases and service life problem arises. Even though normal circuit protection is applied in designing stage, it is often hard to identify the cause of malfunction in certain cases such as fatigued power supply due to over-running, malfunctions of main elements or over heating. This report will cover experimental results with the prototype we made, that monitors the efficiency of switching power supply and that protects a circuit when it drops below the standard value.

• 한국산업경영시스템학회:학술대회논문집
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• 한국산업경영시스템학회 2002년도 춘계학술대회
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• pp.343-348
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• 2002

We are concerned with a long-term replenishment contract for the ARIMA demand process in a supply chain. The chain is composed of one supplier, one buyer and consumers for a product. The replenishment contract is based upon the well-known (s, Q) policy but allows us to contract future replenishments at a time with a price discount. Due to the larger forecast error of future demand, the buyer should keep a higher level of safety stock to provide the same level of service as the usual (s, Q) policy. However, the buyer can reduce his purchase cost by ordering a larger quantity at a discounted price. Hence, there exists a trade-off between the price discount and the inventory holding cost. For the ARIMA demand process, we present a model for the contract and an algorithm to find the number of the future replenishments. Numerical experiments show that the proposed algorithm is efficient and accurate.

• 수산경영론집
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• 제39권1호
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• pp.17-42
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• 2008

This study tried to build a structure model for the Korean flatfish aquaculture market by a system dynamics approach. A pool of several factors to influence the market structure was built. In addition, several reasonable factors related to the flatfish aquaculture market were selected to construct the causal loop diagram (CLD). Then the related stock/flow diagrams of the causal loop diagrams were constructed. This study had been forecasting a production price and supply, demand, and consumption volume for the flatfish market by a monthly basis, and then made some validation to the forecasting. Finally, four governmental policies such as import, storage, reduction of input, and demand control were tentatively evaluated by the created model. As a result, the facts that the demand control policy is most effective, and import and storage policies are moderately effective were found.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.679-680
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• 2011

This paper is developed to Energy Balance Flow show the flow of total energy resource be used nationally. The Energy Balance Flow is applicable of demand management factor through the analysis of foreign energy model of supply and demand and energy statistic data in the country. This study is based on and developed to Energy system management model is able to appraisal efficient of energy cost cutting, CO2 emission reduction and Energy saving at the national level calculated effect reached amount of primary energy to change of energy flow followed application of demand side management factor is able to appraisal quantitatively at the total energy to model of demand and supply.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전력기술부문
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• pp.233-235
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• 2001

This paper deals with frequency control of demand users that have power plants by under-frequency relay. The demand users supply electrical power to a part of their loads by their power plants and to other rest of their loads by utility. While electrical power supply is stopped by faults of utility network, the system of demand users network is separated from total power system and their system frequency goes below normal limits. In this paper, this situation and the effect of under-frequency relay application are simulated by EMTDC.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.758-762
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• 2007

Revenue management is a new approach method to solve the problem of supply and demand, and one of fields which is diffused quickly at the service enterprise to use perishable-asset like the transportation business. It is based on multiple fare policy that discount charge reservation should be received if the benefit value of current discount fare is more than expected profit of the normal fare reservation it will be able to occur in future when suitable goods is sold to the customers at discount fare, at the time they want, and at assigned seat by controlling supply and demand from market. In this research, I will review on initial operation case for special class goods that the seat which is limited is assigned at some of train and portion of KTX for demand dispersion and new demand creation at peak time, put a limit in purchase conditions, and provides discounted fare. I will also try to find implication for strategic operation.

• 대한임상검사과학회지
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• 제50권4호
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• pp.511-524
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• 2018

본 연구는 임상병리사 인력의 인력의 수급전망을 추계하여 인력계획 수립에 필요한 정책자료를 제공하는 것을 목적으로 한다. 공급은 기초추계(baseline projection) 모형에 근거한 인구학적 방법(demographic method)을 이용하여 추계하였으며, 수요추계는 임상병리사가 검사하는 임상병리검사 건수를 이용하는 의료수요에 의한 방법을 적용하였다. 전반적인 임상병리사 인력수급 추계결과는 생산성의 시나리오에 따라 공급이 과잉되기도 하고 부족하기도 할 것으로 전망되었다. 이렇게 임상병리사의 수급 비교 결과는 임상병리사의 생산성 가정에 따라 달라지지만, 어느 시나리오를 선택할 것인가는 궁극적으로 정부의 정책방향에 따라 달라진다. 즉 임상병리사의 생산성을 현재보다 높게 채택하는지 혹은 낮게 책정하는지는 보험재정 여건 등을 고려해야 하는 정부 정책에 달려있는 것이다. 이에 본 연구에서 정부의 정책방향이 고려되지 않은 2012년 현재의 생산성을 기준으로 한 '생산성 시나리오 3'을 살펴보면, ARIMA모델을 적용한 수요시나리오를 중심으로 보면 근무일수에 따라 2030년에는 2821명에서 4,530명의 임상병리사 공급이 과잉될 것으로 전망된다. 이러한 공급과잉은 전체에서 차지하는 비중이 10%미만이기 때문에 크게 문제가 되지 않을 것으로 판단된다. 그러나 임상병리사사 취업률이 60%대인 점을 감안하면 미취업자를 활용하는 정책도 함께 고려해야한다. 이러한 대책으로는 미취업인력에 대한 취업기회를 확대하는 방향으로 나아가야 할 것이고, 이를 위해서는 보건소 검사실의 기능강화 및 임상병리사 정원증원 및 신분보장, 통원치료 환자를 위한 상설 검사체제 확립, 산업재해 분야 및 의원급 검사기능 강화, 무면허 검사요원의 통제, 해외인력수출 확대 등이 필요할 것으로 사료된다.

• 한국항해항만학회지
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• 제36권3호
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• pp.205-213
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• 2012

본 논문은 내항상선 선원의 수급 안정화를 기하여 연안해운의 발전을 도모하기 위하여 구체적으로 내항상선 선원의 수급실태의 분석을 통해 향후 내항상선 선원의 수요 전망을 예측하고자 하는 것이다. 연안 해운기업의 경쟁력 강화에 있어서 선원수급과 선원인력양성의 필요성을 인지하고, 특히 인력수요예측의 정밀성을 높이고 지속적이고 피드백이 가능한 예측 프로세스를 모색하는 것은 현재 연안해운기업의 열악한 선원인력관리의 어려움을 극복하기 위한 단초로서 현재 시의적절한 연구주제가 될 것이다. 향후 내항상선 선원의 수요부문에서 선박 척수의 변화에 따른 시뮬레이션 결과, 증가율 기준을 0.1%~1% 폭의 수준을 상정할 경우 7,879~8,258명으로 예측되었다. 이는 2009년 현재 7,831명 수준에서 매년 약 20~430명의 추가 인력이 투입되어야 함을 의미한다. 일반적으로 5년 내지 10년 단위로 단속적으로 예측치를 제시하는 방법은 예측의 사후추적이 부실한 관계로 예측정확도가 떨어지기 쉬운 점을 선행연구 검토 부분에서 확인하였으며, 본 연구와 같이 현황자료를 기초로 예측치와 실제치의 차이에 대한 피드백을 위해 매년 평가를 실행하고 그 결과를 차기년도 예측에 반영하는 접근방법을 도입한다면, 선원인력의 수급에 대한 예측정확도를 높일 수 있을 것이다.