• 한국경영과학회:학술대회논문집
• /
• 한국경영과학회 2000년도 추계학술대회 및 정기총회
• /
• pp.206-208
• /
• 2000

This paper focuses on what the philosophy and methodology of the Theory of Constraints contribute to B2B e-commerce. Typical characteristics of TOC methods applicable to B2B are explored in comparison with traditional MRP, JIT, TQM and cost accounting. Addressed are expected changes in various backend business areas supporting e-commerce. TOC provides B2B management with the capability of logistics transparency, speedy decision making, and better cashflow.

• Industrial Engineering and Management Systems
• /
• 제9권2호
• /
• pp.88-96
• /
• 2010

This paper presents a two-phase quantitative framework to aid the decision making process for effective selection of an efficient freight logistics hub from 8 alternatives in Thailand on the North-South economic corridor. Phase 1 employs both multiple regression and Pearson Feature selection to find the important criteria, as defined by logistics hub score, and to reduce number of criteria by eliminating the less important criteria. The result of Pearson Feature selection indicated that only 5 of 15 criteria affected the logistics hub score. Moreover, Genetic Algorithm (GA) was constructed from original 15 criteria data set to find the relationship between logistics criteria and freight logistics hub score. As a result, the statistical tools are provided the same 5 important criteria, affecting logistics hub score from GA, and data mining tool. Phase 2 performs the fuzzy stochastic AHP analysis with the five important criteria. This approach could help to gain insight into how the imprecision in judgment ratios may affect their alternatives toward the best solution and how the best alternative may be identified with certain confidence. The main objective of the paper is to find the best alternative for selecting freight logistics hub under proper criteria. The experimental results show that by using this approach, Chiang Mai province is the best place with the confidence interval 95%.

• 산경연구논집
• /
• 제9권3호
• /
• pp.7-17
• /
• 2018

Purpose - The purpose of this paper is to improve last mile delivery capability and ensure customers' satisfaction by approaching an analytic hierarchy process(AHP) and identifying criteria framework to determine locations of last mile delivery centre(LMDC). Research design, data, and methodology - Traffic congestion and emission policy in cities are barriers of last mile delivery in dense areas. The urban consolidation centre(UCC) cannot increase last mile delivery efficiency in dense cities because of their space and traffic limitation. In this paper, we develop a case to improve last mile delivery efficiency and to ensure customers' satisfaction by concentrating on LMDC. In addition, AHP has been applied to identify criteria framework and determine LMDC locations. The weighted priorities are derived from parcel delivery industry experts and have been calculated using Expert Choice software. Results - The framework criteria have assisted decision makers to place LMDC in a dense area to enhance customer's satisfaction with last mile delivery service. Conclusions - AHP has provided ranking framework criteria of LMDC potential for parcel delivery industry. The LMDC helps by improving last mile delivery efficiency to final destination amids conditions of CO₂ emissions, traffic congestion, and pollution problems. It especially concerns delivery service activities when delivering parcels to customers rather than UCC.

• 한국항해항만학회지
• /
• 제32권4호
• /
• pp.295-304
• /
• 2008

In order to achieve a sustainable competitive advantage in the expanding maritime transportation market, most shipping companies are making every effort to reduce transportation costs. Likewise, the car shipping companies, which carry more than 80% of total car import and export logistics volume, also do their utmost for transportation cost saving. Until now many researches have been made for efficient maritime transportation, but studies for car shipping companies have rarely been made. For this reason, this study has tried to develop a maritime transportation planning support system which can help to save logistics costs and increase a competitive power of car shipping companies. To this end, instead of manual effort to solve the routing problem of car carrier vessels, this study has used an integer programming model to make an optimal transportation planning at the minimum cost. Also in response to the frequent changes both in the car production schedule and ship's arrival schedule after the completion of transportation planning, this research has developed a decision support system of maritime transportation, so that users can easily modify their existing plans.

• 대한교통학회지
• /
• 제31권5호
• /
• pp.3-15
• /
• 2013

본 연구에서는 고속도로 공사구간에 이동이 가능한 PVMS(Portable Variable Message Sign)를 일정 간격으로 설치하여 VSL을 구현하는 교통류 제어전략을 구성하여 공사구간에 어떠한 영향을 미치는지 파악하고자 하였다. 다기준 의사결정 기법 중 하나인 AHP기법 및 다기준 가치함수를 이용하여 교통소통, 교통안전, 환경을 대표하는 척도들을 동시에 고려할 수 있는 평가 방법론을 정립하였으며, VSL전략의 도입 전 후 개선효과를 도출하고 실시간으로 수집되는 교통량 및 중차량 혼입율을 고려한 최적 VSL전략 대안선정을 연구의 목표로 하였다. 개발된 평가 방법론을 통해 시뮬레이션 결과를 분석하였으며, 결과의 통계적 유의성 검정을 위해 분산분석을 수행하였다. 분석결과, VSL 대안 2(PVMS 400m간격)가 6개의 Case에서, VSL 대안 1(PVMS 200m간격)이 5개의 Case에서, VSL 대안 4(PVMS 800m간격)는 1개의 Case에서 최적 대안으로 도출되었다. VSL 대안 3(PVMS 600m간격)는 모든 Case에서 최적 대안으로 선택되지 않았으며 4개 Case에서 가장 안 좋은 대안으로 나타났다. 이는 VSL전략이 항상 개선된 효과를 보이지 않는 것을 의미하며 교통상황별로 적정 대안의 도입이 필요하다는 것을 나타낸다. 본 연구에서 시도된 AHP기법을 이용하여 여러 효과척도를 복합적으로 고려한 교통류관리전략 평가방법은 향후 다목적 의사결정방법의 교통류관리전략에 적용 시 하나의 예시가 될 수 있을 것으로 기대되며, 연구에서 제안하는 PVMS를 이용한 공사구간 VSL전략은 교통정보센터에서 실시간으로 수집되는 데이터를 통해 교통류 관리를 위한 운영 및 제어방안에 활용될 것으로 기대된다.

• 품질경영학회지
• /
• 제32권2호
• /
• pp.77-92
• /
• 2004

It is difficult but very necessary to measure the productivity of container terminals as logistics service provider. It is meaningful to find the appropriate inputs and outputs of the logistics service delivery systems and to measure the relationship between these inputs and outputs. This study proposes a model of evaluating the efficiency of container terminals. The evaluation consists of three phases. First, DEA(Data Envelopment Analysis) phase, determines the efficiency score and weights of DMUs(Decision Making Unit). This phase performs through four steps : selection of DMU, selection of DEA model, determination of input and output factors, calculation of efficiency score and weights for each DMU. Secondly, CEM (Cross Evaluation Model) phase, is to calculate the cross-efficiency scores of DMUs. This phase performs through three steps: selection of CEM, determination of cross-efficiency score for each DMU and development of cross-efficiency matrix. Finally, average cross-efficiency analysis phase is to compute the average cross-efficiency score. The proposed model discriminates among DMUs and ranks DMUs, whether they are efficient or inefficient.

• 한국신뢰성학회지:신뢰성응용연구
• /
• 제10권1호
• /
• pp.73-91
• /
• 2010

All activities relate to railway traffic involve risk and that these arise from a combination of the nature of operating activities. Proper management system is required to provide the organizational capability to reveal, analyse and address these weaknesses over time and in reasonably practicable ways, which will determine the rate at which risks can be further reduced. This paper presents a systematic risk analysis approach to safety planning and decision making, informed by a range of risk assessment techniques. An railway organization's safety management system is also presented that shows the approaches taken to minimize the external risks, and identify the shared risks and explain how they will be controlled through collaboration with others.

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2022년도 추계학술대회
• /
• pp.305-306
• /
• 2022

중대재해 처벌 등에 관한 법률에 따라서 터미널 운영사는 재해예방에 필요한 인력 및 예산 등 안전보건 관리체계의 구축 운영과, 재해 발생 시 재발 방지 대책의 수립 및 이행이 필요하다. 자율주행 항만장비 도입에 따른 항만 시설 내 안전사고를 예방하고, 안전사고 발생시 기민하게 의사결정을 지원할 수 있도록 항만시설 안전관리시스템 연계 활용 방안에 대한 연구이다.

• International Journal of Naval Architecture and Ocean Engineering
• /
• 제13권1호
• /
• pp.340-350
• /
• 2021

This paper proposes a decision support model for USVs to improve the accuracy of collision avoidance decision-making. It is formed by Navigation Safety Domain (NSD) and domain-based Collision Risk Index (CRI), capable of determining the collision stage and risk between multiple ships. The NSD is composed of a warning domain and a forbidden domain, which is constructed under the constraints of COLREGs (International Regulations for Preventing Collisions at Sea). The proposed domain based CRI takes the radius of NSD in various encounter situations as threshold parameters. It is found that the value of collision risk in any directions can be calculated, including actual value and risk threshold. A catamaran USV and 6 given vessels are taken as study objects to validate the proposed model. It is found that the judgment of collision stage is accurate and the azimuth range of risk exists can be detected, hence the ships can take direct and effective collision avoidance measures. According to the relation between the actual value of CRI and risk threshold, the decision support rules are summarized, and the specific terms of COLREGs to be followed in each encounter situation are given.

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2003년도 춘계공동학술대회논문집
• /
• pp.257-264
• /
• 2003

우리나라 정유회사는 1980년대부터 오일운송을 소유 오일탱커보다도 용선에 의존하는 비율이 높아지고 있으며, 용선중에서도 정기용선보다는 스팟(spot)용선을 선호하고 있다. 그러면 국내 정유회사가 어민 의사결정요인에 의하여 자사 소유 탱커선보다도 용선에 의존하여 오일운송을 하는지, 혹은 전적으로 용선에만 의존하여 오일운송을 하는지를 규명하고자 하는 것이 본 연구의 목적이다. 따라서 연구의 목적을 달성하기 위하여 선행연구에서 3가지 절차, 즉 선행연구, 설문조사 그리고 전문가 의견조사를 거쳐 도출된 10개의 의사결정요인을 활용하여 본 논문에서는 어떠한 요인들이 정유사의 선대구성에 영향을 미쳤는지를 설문과 면접법에 의하여 실증분석하였다. 연구 대상인 국내 정유회사는 모집단인 현대 및 인천정유, LG-Caltex, S-oil 그리고 SK 등 4개이며 분석의 초점은 각 요인이 정유회사의 탱커선대의 구성에 미치는 영향 즉, 탱커 소유와 용선의 증감 추이와 용선형태의 변화에 두었다. 분석결과 운송비용상승요인과 국제규정인 MARPOL과 OPA 90요인이 탱크선대구성에 가장 큰 영향을 미치고 있었다.