• 산업공학
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• 제13권3호
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• pp.455-461
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• 2000

Logistics systems can be evaluated by how productively distribution center operates, how promptly transportation vehicle dispatches, how efficiently facility layout is, and so on. In this paper, a practical vehicle routing scheme with fixed delivery time and fixed vehicle routes is introduced. The method helps the distribution center reduce logistics cost with respect to dispatching vehicles, and satisfy the customer with pre-determined delivery time window constraints. A case study has shown that the proposed scheme not only generates a feasible schedule with time windows, but also balances material flow in warehouse.

• 한국항해항만학회지
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• 제44권1호
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• pp.32-43
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• 2020

본 연구는 침체된 해운물류 산업의 대안으로 제시되고 있는 해운물류 플랫폼의 품질향상을 위한 요인을 도출하고 평가하는 것을 목적으로 한다. 이를 위해 선행연구 및 전문가 인터뷰를 통해 요인을 선정하고, 해운물류 플랫폼 사용 경험이 있는 선사, 포워더, 화주기업 및 플랫폼 사업자를 대상으로 설문조사를 실시하였다. 분석방법으로는 IPA(Importance-Performance Analysis)를 활용하여 해운물류 플랫폼의 품질평가를 수행하였다. 연구결과, 사용자들이 중요하게 인식하고 있으나 만족도가 낮은 요인으로 "제공되는 서비스 경쟁력", "타 운송수단과의 연결성", "운임 경쟁력", "운임 투명성", "선복 제공의 안정성"이 도출되었다. 향후 해운물류 플랫폼이 활성화되기 위해선 이러한 요소들에 역량을 집중하여 우선적으로 개선이 필요하다. 본 연구는 해운물류 플랫폼의 구성기능을 제시하고 평가요인을 도출한 것에 학문적 시사점이 있다. 또 해운물류 플랫폼에 대한 사용자의 참여를 향상시키기 위한 방안을 제시한 것은 산업적 시사점이다.

• 안보군사학연구
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• 통권8호
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• pp.351-381
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• 2010

Established on February 1st, 2010, The ROKN maritime task flotilla has a goal to successfully cope with North Korea and other potential threats. Unlike precedents of its kind, The ROKN maritime task flotilla is expected to concentrate more an far-sea strategies than coastal strategies. In such circumstances however, the existing maritime logistics systems have limitations upon which to utterly support the operation conception of the ROKN maritime task flotilla seven. To ensure it's efficiency, transformation of the systems is prerequisite. The purpose of this study is to deduce an adequate maritime logistics system for the ROKN maritime task flotilla by evaluating the limitation of the current system and foreseeing its performance necessary abilities to operate in the future. In order to do this, the study presented problems and the direction of development on the structural and behavioral sides. Fist, regarding problems in the structure of maritime logistics system, the investigation pronounced the need of improvement in mobile logistics support ability and its speed. In addition, for the behavioral side, the need of improvement in logistics cooperation system and self-maintenance ability was affirmed. For the development of an adequate maritime logistics system, the study suggested the amelioration in the operation of an adequate mobile logistics support platform and the speed of the logistics using high-speed transportation such as planes for the structural side. Moreover, for the behavioral side, it recommended th enhancement of logistics cooperation system including the nations that already imported th weapon system, amelioration of self-maintenance ability, and necessity to operate mobile maintenance group.

• Journal of Korea Trade
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• 제24권3호
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• pp.20-36
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• 2020

Purpose - As the global product network expands through both internationalization and diversification of the multimodal transportation system, corporate strategies have shifted to emphasize the importance of a high value-added international logistics system. To guide policies and strategies to attract relevant industries, this study aims to analyze the location competitiveness of regional logistics distribution center to serve Northeast Asia. Design/methodology - Multi-criteria techniques are considered to offer a promising framework for evaluating decision-making factors. This paper employed an analytic hierarchy process to analyze the hierarchal structure of determinants for selecting the location of a regional logistics distribution center. Adopting both qualitative and quantitative evaluations, this study suggest political implications for a regional logistics distribution center development, such as the direction of political support, service differentiation and infrastructure development. Findings - This study developed a location competitiveness evaluation model, based on the case study of the major port-cities in Northeast Asia. Evaluation model incorporates five factors underpinning 17 components extracted using factor analysis. The results revealed that the logistics factor is the most significant factor for evaluating the competitiveness of a regional logistics distribution center. The remaining factors were market, costs, and services environment. Comparing qualitative and quantitative evaluations, results provide useful insights for a regional logistics distribution center development in Northeast Asia. Originality/value - This study revealed differences between qualitative and quantitative evaluations. The finding implies that prior works on evaluation models of competitiveness has not successfully measured the gap between quantitative data and expert' evaluations. To overcome this limitation, this paper considered both actual data such as actual distance, cost, the number of companies located, and expert opinions.

• 한국항행학회논문지
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• 제22권1호
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• pp.13-19
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• 2018

본 논문에서는 저고도 무인기 교통관리 체계에서 운용될 무인기의 사용 용도별로 비행패턴을 분석하였고, 시뮬레이션 모형을 개발하였다. 무인기 비행패턴은 감시형, 선회형, 배송형 패턴으로 분류하였으며, 무인기 사용 용도별로는 농업, 시설 점검, 공공안전 및 보안, 물품 배송으로 총 네 가지 경우를 고려하였다. 또한 저고도 무인기 교통관리 체계에 적용할 공역 운용방식을 검증하기 위한 도구로써 시뮬레이션 모형을 개발하였다. 개발된 시뮬레이션 모형을 감시형 비행패턴에 적용해 보았으며, 그 결과 정해진 입력을 받아 주어진 비행패턴을 그리며 비행하는 것을 확인 및 검증하였다. 본 시뮬레이션 모형은 향후 무인기가 다양한 비행패턴을 그리며 해당 용도에 맞게 안전하고 효율적으로 운항할 수 있는지 검증하는데 사용될 예정이다.

• 한국ITS학회 논문지
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• 제17권2호
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• pp.152-167
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• 2018

고속축중기 시스템은 개별 차량의 통행속도 및 하중 정보를 수집할 수 있어 기존의 차량검지장비와 비교하여 다양한 활용이 가능하다. 그러나 고속축중기 원시 자료는 지점 검지 자료로 구간별 안전성 분석에 직접 적용하는 것은 한계가 있다. 이를 극복하기 위하여 본 연구에서는 고속축중기 자료 중 검지 시간, 검지 속도, 차량길이, 차량 종류, 차량 무게정보를 수집하여 대리안전척도로 이용한 상충률과 충격량을 산출하는 방법론을 제시하였다. 이를 통하여 고속도로 교통류 내의 추종관계 별 후미추돌 위험도를 분석하고 안전성을 평가하는 것이 가능할 것으로 판단되며 해당 구간 내 교통안전 위해차종 선별 및 계도 방안 모색에 기초연구로 활용될 수 있을 것으로 기대된다.

• 산업경영시스템학회지
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• 제40권2호
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• pp.60-67
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• 2017

A baggage handling system (BHS) in airport is an unified system for moving the passengers' baggage in designated time. Input baggage from the check-in counter travels to the baggage claim area or cargo handling terminal through this system. In particular, entryway BHS consists of conveyors, X-ray and sorters such as tilt-tray to send the baggage to departing airplane and it could have various problems for handling certain amount of baggage in restricted time such as baggage jamming at certain merge point. This causes systemic error such as delay of the time, omissions of the baggage and even breakdown of the equipment and inefficiency. Also the increasing maximum time of the baggage passing through the BHS could delay the flight schedule and finally decrease the service level. Thus, the algorithm for controlling the flow of the merge is essential to the system. The window reservation algorithm is the one of the most frequently used methods to control the merge configuration. Above all, the reserve location, so called reserve ahead point, that allocates the window is important for the performance of the algorithm. We propose the modified window reservation algorithm and the best reserve locations by changing the reserve ahead point in the induction conveyors. The effect of various reserve ahead points such as the capacity and utility of the system were analyzed and the most effective reserve ahead point combination was found. The total baggage processing time and the utilization of the tilt-tray are properly considered when choosing the optimal Reserve ahead point combination. In the layout of this study, the configuration of four conveyors merged into one tilt-tray is studied and simulation analysis is done by AutoMod(R), 3D simulation software. Through the simulation, the window reservation algorithm is effectively operated with the best combination of reserve ahead point which reduces the maximum baggage travel time.

• 한국통신학회논문지
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• 제41권10호
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• pp.1317-1327
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• 2016

BHS는 공항 내 가장 복잡한 시스템중 하나이며, 높은 시스템 확장비용을 고려했을 때 효율적인 운영 시스템이 요구된다. 비효율적인 BHS 운영 시스템은 병목현상을 발생시켜 시스템 능력을 하락시키는 동시에 체크인시설의 뷸균형을 야기한다. 따라서 본 연구의 목적은 BHS 합류부의 병목현상을 제어함으로써 BHS와 체크인 구역의 효율성을 향상시키는 것에 있다. 데이터 네트워크에 사용하는 흐름제어 개념을 차용하여 새로운 로직을 제안하였으며, 시뮬레이션을 기반으로 컨베이어의 병목현상이 고객 대기열에 미치는 영향을 분석하였다.

• Journal of Korea Trade
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• 제27권2호
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• pp.22-46
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• 2023

Purpose - study aims to investigate the relationships between global value chain (GVC)- and transportation-related determinants and economic performance. Also, moderating effects of COVID-19 on the relationships are theoretically and empirically discussed. A limitation of previous studies includes their over-reliance on the opportunities of GVC participation and larger transportation. This study represents the challenges associated with them. Also, it shows how GVC and logistics can be difficult in case of a market fluctuation such as COVID-19. Design/methodology - The sample for this study includes 828 observations from 138 countries. A semi-panel data set has been used. Six observations for each country are used to empirically test the hypotheses and a Two-way cluster model is conducted. Findings - It is confirmed that GVC forward participation contributes more than the backward participation to enhance performance. Transportation infrastructure is critical, but large scales of marine and air transportations are not positive in terms of economic performance. Stricter government response to COVID-19 negatively moderates economic performance by GVC backward participation and transportation infrastructure. Originality/value - The spread of COVID-19 is causing a severe collapse of GVC and transportation. This study empirically verifies the moderating effects of the government stringency on GVC and transportation. Previous studies usually discuss a positive impact of GVC and transportation size on economic performance. However, this study aims to show various challenges behind GVC participation and large scale transportation.

• 대한교통학회지
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• 제35권4호
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• pp.307-320
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• 2017

본 연구는 메타분석(Meta-Analysis) 기법을 적용하여 ESC(Electronic Stability Control) 시스템의 교통안전 측면의 효과를 평가하였다. 교통안전성의 평가지표로 사고율, 사망사고율, 통제상실 사고율을 설정하였으며 ESC를 주요 키워드로 선정하여 기존 문헌을 수집하였다. 수집된 연구결과를 승산비의 효과크기(Effect-size)로 정리하였고, 개별 연구들 간의 이질성을 고려하여 랜덤효과모형을 적용해 통합 승산비 효과크기를 도출하였다. 분석결과, 사고율의 승산비 효과크기는 0.90으로 차량에 ESC 적용 시 사고율이 10% 감소하는 것으로 나타났다. 또한 사망사고율의 승산비 효과크기는 0.64로 차량에 ESC 시스템 적용 시 사망사고율이 36% 감소하는 것으로 분석되었다. 통제상실 사고율의 승산비 효과크기는 0.73으로 도출되어 ESC 시스템 적용 시통제상실 사고율이 27% 감소하는 것으로 분석되었다. 본 연구의 결과는 상용차 ESC 장착 의무화를 위한 제도 정비 및 관련 기술 개발 전략 수립 시 유용하게 활용될 수 있을 것으로 판단된다.