물류센터 일괄상하역체계 개선을 위한 설계지원 시뮬레이터

이언경 ( Lee Eon-kyung ),최용석 ( Choi Yong-seok ),김선구 ( Kim Sun-gu ) 한국해운물류학회(구 한국해운학회) 2016 해운물류연구 Vol.32 No.3

물류센터의 상하역작업은 출하 대기장소에 있는 파렛트 화물을 상하차하는 작업이다. 제한된 공간에서 반복적인 상하역작업이 원활하게 수행되기 위해 일괄상하역 방식을 지원하는 3가지 시스템 대안을 제시하였다. 본 연구에서 제안된 일괄상하역 시스템의 생산성 향상 정도를 파악하기 위해 다양한 대안 생성이 가능하도록 객체지향 시뮬레이션 방법론을 사용하여 재사용 및 확장이 용이하도록 하였다. 시뮬레이션 분석 결과 트럭 서비스 평가지표인 트럭 서비스시간이 감소하고, 지게차의 가동률은 현재보다 대기시간이 절반 정도 감소되는 것으로 나타났다. 개발된 시뮬레이션 모델은 향후 물류센터 분석 및 설계에 효과적으로 활용될 것으로 기대된다. Warehousing operations include palletizing operations that consist of container handling with forklift dock, and container shifting between rack areas and docking area using forklists. However, the loading and unloading operations are subject to the waiting time needed to perform lifting operations by the forklift. To solve this problem of increased waiting time, the loading and unloading system can perform the operation by batched pallet with its own power. Recently, a design that uses a simulation method was proposed to minimize the error in the new system in warehouses and utilize multiple simulation techniques to reduce design time. Previous studies reviewed the simulation model to check specific changes in the performance of the new system when it was introduced in a warehouse. This study dose a comparative analysis of the performance of the proposed alternative and the current designs. In order to efficiently perform repeated work in a limited space, we provide three alternatives to support the batch loading and unloading operation. They are the general-purpose system, dedicated system, and system for a wing-body truck. The simulation model has been developed to compare the productivity of the proposed system to that of the current system. The alternatives proposed to improve the performance of forklift system for use in current warehouse operations of loading and unloading improves each palletizing operation by simultaneously reversing the batch up and down the upper and lower stations as opposed to the batch lifting method for individual tasks, thereby, decreasing the waiting time of the forklift. The cargo loading and unloading system that uses the specification designed to target a prototype testing phase, with the input data as presented in this study, does not reflect the operating conditions of a complete warehouse. As a result, it means that if the truck service is improved and the waiting time of the forklift is greatly reduced, then the number of forklifts required to handle external trucks can be reduced sufficiently. However, the introduction of the new system requires the generation of a large initial investment, which also depends on the application of warehouse specific size and volume needed to perform a productivity level analysis using quantitative economics. The design support simulator plays a role in periodically simulating and calculating the actual forklift’s movement, according to the operational rules, and the transfers of cargos by stacking rules. By using statistics measures, we can design its physical layout. This study aim to provide feasible alternatives for batch loading and unloading systems used in warehouses. The result of this study should take into consideration the design of warehouses as well.

한국-유라시아간 해륙복합운송 문제점 및 해결 우선순위 분석

이언경(Eon-Kyung Lee),이수경(Suyoung Lee),김보경(Bokyung Kim),어승섭(Seungseob Euh) 한국항만경제학회 2019 한국항만경제학회지 Vol.35 No.2

2018년 남북정상의 4.27 판문점 선언으로 한반도의 평화 및 협력 분위기가 조성되고, 그해 6월에는 국제철도협력기구(OSJD) 가입으로 한반도를 포함하여 중국, 러시아 등 유라시아와 연계하는 복합물류체계 기반이 마련되었다. 본 논문에서는 한반도와 유라시아를 효율적으로 연결하는 복합물류 네트워크 구축하는데 애로사항을 파악하기 위하여 현재 대륙철도를 이용하고 있는 실무전문가를 대상으로 설문조사를 실시했다. 설문항목은 국경통과 절차, 기술, 시설, 운영, 정부지원 측면 등 5가지로 나누어 애로정도와 해결 우선순위 점수를 조사했다. 그 결과 한국-유라시아간 국제 복합운송 문제점 중에서 우선 해결해야 할 과제로는 환적 시설을 개선하고, 통과국마다 검사하는 것을 폐지하고 통관서류를 간소화해야하며, 운임변동을 최소화하는 방안 마련 등이 선정되었다. 결론적으로 한반도와 대륙철도 연계 및 복합운송 활성화를 위해서는 첫째, 국경에서의 궤간 변경을 원활하게 하기 위한 환적 시스템 개발을 국제공동으로 실시해야 하고, 둘째 남·북·중·러 철도시설 및 운영시설을 표준화해야 하며, 셋째, 통관간소화, 정기 발차, 운임 변동 정보 공유 등을 위한 남·북·중·러의 국제협력이 필요하고, 마지막으로 정부 차원에서 블록트레인 구성을 위한 물량 확보 방안을 마련하고 새로운 비즈니스 모델을 개발해야 할 것으로 판단된다. The Panmunjom Declaration adopted by the leaders of South and North Korea on April 27, 2018, has created an environment conducive for peace and cooperation in the Korean Peninsula. In the June of last year, South Korea has joined the Organization for Cooperation between Railways (OSJD). The membership of OSJD has established a solid foundation for restoring a multimodal logistics system that connects the Korean peninsula to Eurasia countries, including China and Russia. In this paper, a questionnaire survey targeting working-level experts was conducted to find the barriers in constructing multimodal logistics that efficiently connect the port-continental railways of the Korean peninsula and the Eurasian nations. Survey items were divided into five categories—border crossing procedures, technology, facilities, operation, and government support. As a result, among the most important problems of international multimodal logistics in Eurasia that need to be solved on priority include improving transshipment facilities, eliminating inspection carried out at every country for transit, simplifying documents for customs clearance, and minimizing the changes in freight rates. In conclusion, for vitalizing the connection between the Korean peninsula and the continental railways, it is necessary to develop a transshipment system to facilitate the changes in tracks at the borders by making a joint effort with the international community. Second, railway and operational systems in South Korea, North Korea, China, and Russia should be standardized. Third, international cooperation among South Korea, North Korea, China, and Russia is essential for simplifying customs clearance at borders, priority departure of domestic cargo, sharing information about the changes in freight rates, and so on. Finally, the government should come up with measures to secure the quantity of cargo required to form block trains, while developing new business models.

랜덤 순열의 직렬 합성과 병렬 합성 사이의 트래이드오프에 관한 연구

이언경(Eon-kyung Lee) 한국통신학회 2006 한국통신학회논문지 Vol.31 No.3C

Both composition and XOR are operations widely used to enhance security of cryptographic schemes. The more number of random permutations we compose (resp. XOR), the more secure random permutation (resp. random function) we get. Combining the two methods, we consider a generalized form of random function:SUM<SUP>s</SUP>-CMP<SUP>c</SUP>=(π<SUB>sc</SUB>°?°π<SUB>(s-1)c+1</SUB>)???(π<SUB>c</SUB>°?°π₁) where π₁,?,π<SUB>sc</SUB>are random permutations. Given a fixed number of random permutations, there seems to be a trade-off between composition and XOR for security of SUM<SUP>s</SUP>-CMP<SUP>c</SUP>. We analyze his trade-off based on some upper bound of insecurity of SUM<SUP>s</SUP>-CMP<SUP>c</SUP>, and investigate what the optimal number of each operation is, in order to lower the upper bound.

국제물류비용 절감을 위한 운송장비용 모바일 랙 시장성 분석

이언경(Eon Kyung Lee),정동훈(Dong Hun Jeong),최상희(Sang Hei Choi),변종봉(Jong Bong Byun) 한국무역연구원 2015 무역연구 Vol.11 No.1

This paper deals with a new type of reconfigurable mobile rack for transportation vehicles which can be used in the loading/unloading areas of warehouses. The purpose of this paper is to select proper items for the reconfigurable mobile rack for transportation vehicles and estimate the logistics cost of using the mobile rack for those selected items in real practice. This paper has three main parts. The first part introduces the purpose and concept of research concerning the reconfigurable mobile rack for transportation vehicles. The second part deals with the demand survey method for selecting proper items and shows the result. The last part shows the estimation of the expected effect when the mobile rack is used for the automotive parts. When the reconfigurable mobile rack is used for the automotive parts, the loading efficiency improves by 10 % and logistics cost reduction is expected to be 196.5 billion won on the average.

4차 산업혁명시대 국내 스마트항만 수준 측정과 비교분석

이언경 ( Lee Eon-kyung ),이수영 ( Lee Su-young ) 한국해운물류학회(구 한국해운학회) 2019 해운물류연구 Vol.35 No.2

현재 세계 주요 선진항만들은 완전자동화뿐만 아니라 디지털화·스마트화를 본격적으로 추진하고 있다. 이에 반해 우리나라 항만물류분야는 현재 세계 최고수준 대비안벽 및 이송 부분의 자동화, 정보 연계가 미흡하다. 특히 항만의 외부 영역인 해운 및 배후지와의 연계가 매우 취약한 것으로 나타났다. 전문가 설문조사 결과 네덜란드, 싱가포르항 대비 우리나라 항만물류분야의 4차 산엽혁명 기술 도입 및 스마트항만 구축 속도가 더딘 이유는 직업전환에 대한 노동시장 유연성이 낮고, 데이터 수집 및 관련 법·제도의 정비, 플랫폼 설계 능력 등이 부족한 것으로 조사되었다. 본고에서는 우리나라 항만물류분야의 4차 산업혁명 기술 대응 수준을 제고시키지 않는다면 2030년대에는 선진항만과의 자동화·디지털화 수준 격차가 더욱 심화 될 것으로 전망했으며, 이에 이를 극복하기 위한 대응 방안을 제시했다. We compare the preparation level of Korean ports with that of the world’s best ports in the era of the 4th industrial revolution through focus interviews and expert survey. Fifty-three percent of the survey respondents answered found the preparation of Korean ports insufficient. The connectivity between internal and external parts of the port is poor. Especially, sixty three percent of the experts considered the link between the port and hinterland as very poor. Real-time information flow among shipping, ports, and the hinterland lacks interconnection and integration. Korean ports are worse than the world’s best port on all metrics, except those for the yard and gate because of the lack of labor market flexibility, the legal system related to the 4th industrial revolution, big data policy, and platform design capability.

한ㆍ미 무역구조 유형화를 통한 대미 수출경쟁력 분석

이언경(Eon-Kyung Lee),장지선(Jee-Sun Jang),백종실(Jong-Sil Baik) 한국무역학회 2009 무역학회지 Vol.34 No.5

This paper aims to present a framework for categorizing and evaluating the competitive position of key products in order to maximize export values and volumes to the United States and the World. Key products are divided into 7 groups by using Ward cluster method based on TSI(Trade Specification Index) matrix values. Also, 7 groups are categorized into two sectors; comparative advantage sector and comparative disadvantage sector, by the three factors; TSI, measures of dynamic comparative advantage, and export market share and growth rate of each product. Comparative advantage sector consists of two patterns of having successful price competitiveness and decreasing comparative level despite price competitiveness. Comparative disadvantage sector includes two patterns of deficit quality competitiveness and price competitiveness. As a result of that, decision makers should have different trade policy for each pattern to maximize competitiveness in trade with the United States.

제품 기능 전개 방법에 관한 연구

이언경(Eon-Kyung Lee),박선주(Sunjoo Park),강달모(Dal Mo Kang),하성도(Sungdo Ha) Korean Society for Precision Engineering 2001 한국정밀공학회지 Vol.18 No.4

부가가치 창출을 위한 항만배후단지 유치품목 선정 연구: 인천항 사례를 중심으로

이언경 ( Eon Kyung Lee ),장지선 ( Jee Sun Jang ),길광수 ( Kang Soo Kil ) 韓國海運物流學會 2009 해운물류연구 Vol.25 No.3

논문 : 한,미 무역구조 유형화를 통한 대미 수줄화물 물류패턴 분석

이언경 ( Eon Kyung Lee ),장지선 ( Jee Sun Jang ),백종실 ( Jong Sil Baik ) 한국해운물류학회 (구 한국해운학회) 2010 해운물류연구 Vol.26 No.1

바다모래의 비시장 가치평가 연구

장정인(Chang, Jeong-In),이언경(Lee, Eon-Kyung) 한국해양환경·에너지학회 2019 한국해양환경·에너지학회 학술대회논문집 Vol.2019 No.5