• Proceedings of the Safety Management and Science Conference
• /
• 2001.11a
• /
• pp.43-49
• /
• 2001

최근 기업활동의 자재구매, 제조, 보관 및 운송, 유통/판매까지 포함한 공급체인 전체에 대해 통합관리가 중요한 비스를 받고 싶어한다. 이에 따라 오늘날의 대부분의 기업들은 고도의 기술을 요하는 정보시스템의 도입과, POS, Data Mining 등과 같은 기술들을 이용하고 고객의 요구 사항들을 적시, 적소에서 파악하여 고객이 요구하는 상품과 서비스를 공급하기 위하여 최선과을 정리하고 주요 SCM solution에서 제공하는 기능 및 사용된 방법론을 분석하여, 이를 바탕으로 주문 접수 시 주문물량의 가능납기를 산정하기 위한 입력데이터, 고려요소, 연산절차 등을 포함한 ATI(Available to Promise) 모델을 제제로 부각되고 있다. 현대의 고객들은 제품이나 납기, 품질과 같은 부문에서 높은 서의 노력을 다하고 있다. 최초의 공급자로부터 소비자까지 상품이 전달되는 과정 중에서 재고와 물류비용은 모든 비용의 대부분을 차지하고 있다. 이에 대한 비용을 줄이려고 하는 것이 공급체인관리(SCM)의 기본적인 목적이라 하겠다. 이에 본 논문에서는 공급체인관리(SCM)에 대한 개념과 배경, 필요성 등시한다.

• Proceedings of the Safety Management and Science Conference
• /
• 2013.04a
• /
• pp.173-177
• /
• 2013

공급사슬관리(Supply Chain Management)의 목적은 공급사슬에서 발생하는 재고 및 운송에 관련한 비용을 최소화하는 것이다. 여기서 발생하는 비용은 여러 변수에 의해 결정되기 때문에 공급망 전체를 하나의 시스템으로 보고 모델링하여 분석할 필요성이 있다. 여러 구성요소들을 시간의 흐름에 따라 변화하는 모습을 분석하기 위해 수학적 접근방법을 사용하는 것 보다 시뮬레이션 방법을 사용해 모델링하는 것이 더 효과적이다. 따라서 본 연구에서는 중국의 H자동차의 조달물류의 문제점을 파악하고 이를 개선하기 위한 방안을 마련하기 위해 시뮬레이션 방법을 활용하여 조달물류의 최적 배송주기를 도출하고, 재고관리의 문제점을 개선 하고자 한다.

• Korean Chemical Engineering Research
• /
• v.59 no.3
• /
• pp.345-358
• /
• 2021

This study focuses on the development of the liquid air production process that uses LNG (liquefied natural gas) cold energy which usually wasted during the regasification stage. The liquid air can be transported to the LNG exporter, and it can be utilized as the cold source to replace certain amount of refrigerant for the natural gas liquefaction. Therefore, the condition of the liquid air has to satisfy the available pressure of LNG storage tank. To satisfy pressure constraint of the membrane type LNG tank, proposed process is designed to produce liquid air at 1.3bar. In proposed process, the air is precooled by heat exchange with LNG and subcooled by nitrogen refrigeration cycle. When the amount of transported liquid air is as large as the capacity of the LNG carrier, it could be economical in terms of the transportation cost. In addition, larger liquid air can give more cold energy that can be used in natural gas liquefaction plant. To analyze the effect of the liquid air production amount, under the same LNG supply condition, the proposed process is simulated under 3 different air flow rate: 0.50 kg/s, 0.75 kg/s, 1.00 kg/s, correspond to Case1, Case2, and Case3, respectively. Each case was analyzed thermodynamically and economically. It shows a tendency that the more liquid air production, the more energy demanded per same mass of product as Case3 is 0.18kWh higher than Base case. In consequence the production cost per 1 kg liquid air in Case3 was $0.0172 higher. However, as liquid air production increases, the transportation cost per 1 kg liquid air has reduced by $0.0395. In terms of overall cost, Case 3 confirmed that liquid air can be produced and transported with $0.0223 less per kilogram than Base case.

• International Journal of Highway Engineering
• /
• v.10 no.2
• /
• pp.35-45
• /
• 2008

Trucking is the most frequently used mode for freight movement due to relatively lower shipping costs and its operational flexibility. However, truck traffic can contribute to serious safety problems where they occupy high percentage of the total traffic. Heavy truck crashes arc more likely to result in serious injuries and fatalities than are crashes involving light vehicles. Therefore, safety issues for truck traffic are very significant both for public agencies and for general travelers. The objective of our study is to find truck-involved accident patterns according to traffic conditions and main factors as well as to find the most critical factor through conventional statistical techniques. A vailable data were obtained from TASAS (Traffic Accident Surveillance and Analysis System). Once critical factors are identified, effective and efficient truck management strategies can be discussed.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2023.05a
• /
• pp.294-294
• /
• 2023

보나 댐에 설치된 배수관이나 지하에 매설된 상하수도관과 같이 물을 운반하기 위한 관로 뿐만 아니라 유류를 운송하는 관, LPG와 같은 기체를 운송하는 관처럼 유체를 운송할 때 다양한 관로를 사용한다. 그 중 사용범위나 제작에 대한 용이성 등에 의해서 원형관이 주로 사용된다. 따라서 위와 같은 원형관 내의 관수로 흐름분포에 대한 연구는 아주 중요하며 필요하다. 원형관 내 흐름분포는 관에 연결된 펌프 혹은 수조나 저수지의 수위에 의한 관내 압력에 의해 지배되어지며, 관 내부 표면의 거칠기나 관의 꺾인 정도 등 다양한 요인에 영향을 받는다. 본 연구에서는 일반적인 실험결과를 도출하기 위하여 직선의 원형관을 대상으로 실험과 수치모의를 동시에 수행한다. 실험은 높이 3m, 길이 4.5m, 폭 1.5m 수조의 바닥에서부터 0.45m 위에 위치한 1.8m 길이의 아크릴 재질의 원형관이 설치된 수조에서 진행되었으며, 수치모의 또한 동일한 규모에서 수행되었다. 수조의 수위를 변화시켜 여러가지 레이놀즈 수에 따른 관 내 흐름의 변화에 대하여 분석하는 것이 목적이며, 실험결과와 수치모의 계산결과 간의 비교검증을 통해 분석한다. 이 연구에서는 난류의 영향을 RANS(Reynolds-averaged Navier-Stokes)와 LES(large eddy simulation)을 혼합한 형태인 Hybrid RANS/LES 모형 중 하나인 DES(detacged-eddy simulation)기법을 이용하여 해석함으로써, 빠른 유속으로 인한 관 내의 강한 와(eddy)에 대한 효과를 예측하는데 한계가 있는 RANS 모형과 벽면근처에서의 흐름 해석을 위해 굉장히 높은 격자해상도가 요구되어 계산적 비용 측면에서 효율이 떨어지는 LES 모형의 한계를 극복하고자 한다. DES 모형은 벽에서 떨어진 와에 대하여 LES로 직접해석하고, 벽 근처에서의 흐름에 대해선 난류모형을 통해 모델링함으로써 벽 근처 계산격자와 계산량을 줄이면서 LES와 비슷한 결과를 얻을 수 있다. 실험결과와 수치모의 계산결과 사이의 비교검증을 통하여 관 내 흐름에 대한 수치모의의 적용성을 평가하고 실험에서 측정하기 어려운 난류강도와 압력변동의 상세한 특성을 수치모의를 통해 분석함으로서 관 내 흐름특성에 대하여 자세히 분석하였다.

• Journal of Korea Port Economic Association
• /
• v.23 no.2
• /
• pp.87-107
• /
• 2007

A rapid growth of interregional trade between China and Korea requires new development and expansion of ports. Currently, there is no rail-ferry system between China and Korea, however, a rapid growth of car-ferry industry shows possibilities. Several candidate cities and regions in East part of China and West part of Korea are selected. We identified times in clearance and station-to-station services as major benefits. We compared three transport modes including candidate cities and regions: container ships, car-ferry and rail-ferry. We used AHP (Analytic Hierarchy Process) as an evaluation method to select most competitive rail-ferry routes between two countries. We also used 7-point Likert scales to find out bottlenecks and factors to introduce rail-ferry services as other questionnaires. As a result, Rail Ferry System(RFS) is a little expensive due to wagon loading efficiency in cargo hold of the ship compared to Car Ferry System or Liner Shipping System. But RFS is recommendable in case of Block Train transport between Korea and EU area by may of TCR and TSR comparing Car Ferry System, because it can reduce total transport cost and connecting procedure at border lines of passing countries.

• Journal of Korea Port Economic Association
• /
• v.38 no.4
• /
• pp.199-214
• /
• 2022

A relative important analysis was conducted to determine what factors are required for port selection in Mokpo New Port and what needs to be addressed first in order to expand automobile and steel cargo handling. The port selection factors of Mokpo New Port were classified into 4 major and 13 intermediate categories, and AHP analysis was used. As a result, items such as 'port facilities', 'accessibility to international ports', 'port facility usage fees', and 'connectivity with neighboring cities/ports' were evaluated as important. The respondent groups were divided into shipowner and shipper, port operator and stevedore, and public official, and an analysis of variance (ANOVA) was conducted to verify if there was a difference in perception between the groups. As a result, shipowner and shipper, port operator and stevedore were similar, but there was a difference from public official group. Shipowner and shipper, port operator and stevedore with similar response characteristics were classified into the 'port practitioner' group, and public official were classified into the 'port policy maker' group, and the difference in perception between the group was tested. Therefore, there were differences in some major category items, and even in the intermediate category items such as 'possession of adjacent hinterland industrial complex', 'cargo equipment', '24-hour port operation', 'inland transportation cost', 'accessibility to international ports', 'marketing and incentives' with statistical. In other words, the 'port practitioner' group evaluated items that can increase cargo creation and handling productivity as important whereas the 'port policy maker' group considers port development and policies such as port infrastructure, connectivity with other ports, and incentive support items are more important.

• Journal of Korea Port Economic Association
• /
• v.25 no.4
• /
• pp.45-62
• /
• 2009

The purpose of this study is to analyze the components and to verify the relationship among internal marketing, job satisfaction, organizational commitment and turnover intention in international logistics firm. In order to achieve the purpose of this study, literature survey related to internal marketing, job satisfaction, organizational commitment and turnover intention was carried out and took an empirical analysis by the use of questionnaire method for employees in international logistics firm. The final results and conclusions are as follows; Internal marketing of international logistics firm was positively related to job satisfaction and organizational commitment. Internal marketing, Job satisfaction and organizational were negatively related to turnover intention. Through this results, to increase job satisfaction and organizational commitment, and to decrease turnover intention, it is necessary to concentrate on improving internal marketing strategy.

• Journal of Korea Port Economic Association
• /
• v.36 no.2
• /
• pp.87-108
• /
• 2020

The Korean logistics industry has grown with the development of domestic industries. The industry plays an important role in national and regional economic growth, and the government has continued policy efforts to foster the industry. This study analyzes the competitiveness of the regional logistics industry and its contribution to the regional economy. Location coefficients are used to analyze local specialization in each logistics industry. The value-added rate, GDP contribution, value-added induction coefficient, and net value-added income of regional logistics industries are analyzed using a regional input-output table. As a result, the logistics industry is found to have net value-added income and competitiveness in some regions, and there is no relationship between the location coefficient and the value-added contribution of the regional logistics industry. Seoul, Incheon, Gyeonggi, Busan, and Jeju have the competitiveness of each logistics industry. In addition, we identified the regions where the logistics infrastructure is well developed and those in which it needs to be supported. The regions where the logistics industry has developed require policies for making high value-added by logistics activity, and regions with insufficient growth need to support the development of the logistics industry by investing human resources and capital that can meet the local demand.

• KIPS Transactions on Software and Data Engineering
• /
• v.2 no.6
• /
• pp.403-412
• /
• 2013

This study figures out the concepts of container transport, logistical cost and the distribution of a company through studying documents, and to suggest logistical cost reduction approach, focused on the efficiency of transport which occupied the considerable portion of the total logistical cost of the company. We analyze and discuss the container loading of multiple items for multiple places of departure and arrival through a case study on S company in South Korea. We suggest a direction to reduce the logistical cost of the companies, analyzing the conditions of multiple items loading, and rule-based systems including an algorithm which determines container-loading for minimum freight expenses. We use data mining and OLAP tools of MS Analysis Services to produce loading rules for multiple items loading and generate OLAP cube and decision trees to validate the rules.