On the analysis of container physical distribution system by simulation(Centering on BCTOC)

B. T. Lim(임봉택),J. W. Lee(이재원),K. B. Sung(성경빈),C. Y. Lee(이철영) 한국항해항만학회 1998 한국항해항만학회 학술대회논문집 Vol.2 No.1

본 논문에서는 컨테이너 터미널의 화물처리능력을 분석하는 시뮬레이션 모델을 구축하기 위하여 BCTOC의 컨테이너 물류시스템을 4개의 하위시스템 즉, 하역, 이송, 장치, Gate complex system으로 구분하여 모델을 구성하였다. 시뮬레이션에 사용하는 각종 Data는 1998년 1월부터 6월까지의 실제자료에 대한 기초통계분석과 현장조사를 통하여 구하였다. 본 연구에 의한 결과는 다음과 같다. 첫째, 각 하위시스템의 평균이용률은 G/C 50%, Y/T 58%, 장치시스템 56%, Gate Complex 50%의 평균이용률을 보이면서, 특별히 병목현상을 일으키는 하위시스템은 없었다. 둘째, 시뮬레이션에 의한 분석결과를 기초 통계량 분석결과와 비교시 관측선박수, 평균재항시간, 평균 컨테이너개수, 총 컨테이너개수 등에서 매우 근접한 결과를 도출함으로서, 본 시뮬레이션 모델의 적합성을 검증할 수 있었다. 셋째, 본 연구의 결과를 기존의 유사 연구결과와 비교시 IMF에 의한 BCTOC 컨테이너 물류시스템의 변화를 확인할 수 있었다. For the purpose of building the simulation model on cargo handling capacity of container terminal, we composed a model of container logistics system which has a 4 subsystems; cargo handling, transportation, storage system and Gate complex system. Several date used in simulation gained through spot research and basic statistic analysis using raw data from January to Jane in 1998. The results of this study are as follows; First, average available ratio of each subsystem was G/C 50%, Y/T 57.5%, storage system 56%, Gate complex 50%, and there was no subsystem occurring specific bottleneck. Second, comparing the results of simulation to the results of basic statistics, we can verify suitability of this simulation model. Third, Comparing the results of this study to the results of existed study, we were able to confirm a change of BCTOC container logistics system under IMF situation.

상호연관성을 지닌 계층구조형문제의 평가 알고리즘

이철영,이석태,Lee C.Y.,Lee S.T. 한국항해항만학회 1993 韓國港灣學會誌 Vol.7 No.1

In complex decision making such as ill-defined system, one of the main problem is how to treat ambiguous aspect of the decision making. According to the complexity and ambiguity of the objective systems, many types of evaluation attributes are necessary for the rational decision and the relationship among the attributes become complex and fuzzy. Fuzzy integral is very effective to evalute the complex system with interaction between attributes but how to save the evaluation efforts in the decision making process of grading the membership of the objects or alternative is the problem to be tackled. Because the more object there are to evaluate, the number of decisions to made increase exponentially. Therefore, this paper aimes to propose a new evaluation algorithm based on fuzzy integral which can save the evaluator's efforts in decision making process. The proposed algorithm is constructed as follows : First, compose the fuzzy measure by introducing AHP(Analytical Hierachy Process) & mutual interaction coefficient. Second, generate fuzzy measure value of monotone family set for calculating the fuzzy integral. The effectiveness of the proposed algorithm is investigated through the example and sensitivity of interaction coefficient is illustrated.

로지스틱스의 진화에 대응한 항만의 발전전략에 관하여 - (1) 국제물류에 있어서 제3자물류의 실태 및과제

이철영,여기태,김현,Lee, C.Y.,Yeo, K.T.,Kim, H. 한국항해항만학회 1999 韓國港灣學會誌 Vol.13 No.2

Recently leading edge companies use the Supply Chain Management as a competitive weapon to secure and maintain customer loyalty. As a consequency they are concentrating resources on the company’s core business and employing strategic alliances with third-party providers to ensure the company provides its customers’desired logistics service levels at acceptable costs. Under this circumstances this paper surveys the third party logistics as a leading edge logistics industry coping with the progress of the supply chain management. The status and the type of the TPL including the Forwarder are analyzed in the view point of global logistics. Also the development strategy of third party logistics in the future is suggested.

목포항 물류시스템의 분석에 관한 연구

이철영,남만우,Lee, C. Y.,Nam, M. U. 한국항해항만학회 1996 韓國港灣學會誌 Vol.10 No.1

Rapid change in the technological environment of marine transportation and the development of the ocean shipping industry have fostered a revolution in the port system. This in turn has caused major changes in the function and use of port in Korea. Aside from this, Mokpo Port, however continues to decline, because the existing port facilities and related subsystem are already obsolete with no chance of regaining operational effectiveness and treatment for proper implementation. Although a few studies have been done on the Mokpo Port, has not been found, any reseach for the analytical approach to the transportation system of it. This paper aims to make an extensive analysis of the physical distribution system in Mokpo Port focusing on the coordination of subsystems such as navigational aids system. The base of introduced simulation tool here is the queueing theory. The overall findings are as follows: 1. Among those vessels called at Mokpo Port in 1994, 556 ships(2,736,669 G/T) are oceangoing while 8155 ships(2,587,217 G/T) are domestic. The average size of oceangoing vessels is 4,922,1 G/T, and the domestic is 317,8 G/T. The average arrival interval and service time of the domestic vessels are 6.0 hours and 24.1 hours respectively marking the berth occupation rate over 100%. Those for oceangoing vessels are 34.5 hours, 120.0 hours and 37.2%. In order to maintainin the berth occupation rate to 70% the capacity considering the 1994 of domestic piers must be extended to 145% and oceangoing vessels must be increased to 165%. 2. The capacity of approaching channel is enough to handle the total traffic volume of 3. Tugs are sufficiently being provided to handle all ships requiring their services 4. The capacity of storage and inland transportation systems are sufficient to handle the throughput and the yard stroage utilization rate of No.1 - No.5 is 4.5% and No.6 is 30% of 1993's. 5. The utilization rate of LLC(Level Looping Crane) and PNT(PNeumaTic) are 2.7% and 18.8%, respectively.

성장 생물학 : 110kg 대비 130kg에 도축된 비육돈의 성장효율, 도체 품질 특성 및 수익성

이철영 ( C. Y. Lee ),권오천 ( O. C. Kwon ),하덕민 ( D. M. Ha ),신호원 ( H. W. Shin ),이제룡 ( J. R. Lee ),하영주 ( Y. J. Ha ),이진희 ( J. H. Lee ),하승호 ( S. H. Ha ),김원기 ( W. K. Kim ),김광위 ( K. W. Kim ),김두환 ( D. H. Kim ) 한국동물자원과학회 ( 구 한국축산학회 ) 2006 한국축산학회지 Vol.48 No.4

비육후기 사료의 에너지 수준이 "고체중" 출하돈의 성장효율 및 도체특성에 미치는 영향

이철영 ( C. Y. Lee ),김민호 ( M. H. Kim ),하덕민 ( D. M. Ha ),박재완 ( J. W. Park ),오관용 ( G. Y. Oh ),이제룡 ( J. R. Lee ),하영주 ( Y. J. Ha ),박병철 ( B. C. Park ) 한국동물자원과학회 2007 한국축산학회지 Vol.49 No.4

화학적인 용액 코팅방법에 의한 박막형 고온초전도체에 사용되는 SUS310 금속모재의 평탄화 연구

이종범,이현준,김병주,권병국,김선진,이종수,이철영,문승현,이희균,홍계원,Lee, J.B.,Lee, H.J.,Kim, B.J.,Kwon, B.K.,Kim, S.J.,Lee, J.S.,Lee, C.Y.,Moon, S.H.,Lee, H.G.,Hong, G.W. 한국초전도학회 2011 Progress in superconductivity Vol.12 No.2

The properties of $2^{nd}$ generation high temperature superconducting wire, coated conductor strongly depend on the quality of superconducting oxide layer and property of metal substrate is one of the most important factors affecting the quality of coated conductor. Good mechanical and chemical stability at high temperature are required to maintain the initial integrity during the various process steps required to deposit several layers consisting coated conductor. And substrate need to be nonmagnetic to reduce magnetization loss for ac application. Hastelloy and stainless steel are the most suitable alloys for metal substrate. One of the obstacles in using stainless steel as substrate for coated conductor is its difficulties in making smooth surface inevitable for depositing good IBAD layer. Conventional method involves several steps such as electro polishing, deposition of $Al_2O_3$ and $Y_2O_3$ before IBAD process. Chemical solution deposition method can simplify those steps into one step process having uniformity in large area. In this research, we tried to improve the surface roughness of stainless steel(SUS310). The precursor coating solution was synthesized by using yttrium complex. The viscosity of coating solution and heat treatment condition were optimized for smooth surface. A smooth amorphous $Y_2O_3$ thin film suitable for IBAD process was coated on SUS310 tape. The surface roughness was improved from 40nm to 1.8 nm by 4 coatings. The IBAD-MgO layer deposited on prepared substrate showed good in plane alignment(${\Delta}{\phi}$) of $6.2^{\circ}$.

컨테이너 연안해송 활성화에 관한 연구 -부산항을 중심으로-

노홍승,이철영,Roh H.S.,Lee C.Y. 한국항해항만학회 1993 韓國港灣學會誌 Vol.7 No.1

There has been fast progress in economy in Korea derived by a consecutive five-year plan program for economic development started in the early 1960's. In the field of transportation, rapid changes in the technological environment of transportation and communication have brought a revolution of the transport system, of which inter-modal transportation through containerisation is typical. Because of the rapidly growing traffic volumes of cargo, especially container traffic, and lack of investment into transport infrastructure in the past, both road and railway are beyond their capacity. As a result, the public-road network has suffered a serious congestion problem. For instance, in relation to the corridor between Seoul and Pusan, today, it takes about 14 hours for the journey of container trailer through Kyongbu Expressway, for which it used to take only 7 hours in 1986. For the railway, though the congestion problem is not very serious compared with the road sector, a shortage of capacity on certain main lines has emerged as a problem as railway traffic has increased. Furthermore, the further expansion of the system in near future is difficult due to burden of higher construction the cost. Unlike these two modes, coastal shipping, which has been paid relatively less attention for commodity transport in Korea, shows no constraint in this respect. In addition, it is the most cost efficient mode of transport. This work therefore aims to make a proposal for the alternative inland transportation mode, which is to promote the coastal transport of container. Three obstructing factors for the promotion of the coastal transport are investigated and some solutions for those are suggested as follows : First, it appears to be essential to provide exclusive ports for the coastal shipping, that comply with simplification, specialization and rationalization. The optimum size of berths on the exclusive ports in Pusan port is estimated as 16-20. We found that it needs periodical study and publicity on the advantages from the adoption of the coastal mode. Inducing competition in the coastal shipping market is also necessary. For the supply of the fleet in the coastal shipping, chartering of the surplus ships in the oversea shipping is found to be more desirable than new shipbuilding. Second, to solve the fragmentation of the companies which wish to participate in the coastal transport, government has to implement the subsidy policy. The encouragement of participation of the shipping lines engaging in Korea-Japan run and Korea-East South Asia run, into coastal shipping also needs to be considered cautiously. Third, simplification of the document for entry in ports is needed for rational coastal shipping management. We can use B/L (Bill of Lading) for coastal shipping as a prerequisite to get the indemnity by P & I Club. The reduction of the government controls on entering and leaving the ports also needs.

수로에 있어서 선박조종의 퍼지학습제어

구자윤,이철영,Koo, J. Y.,Lee, C. Y. 한국항해항만학회 1993 韓國港灣學會誌 Vol.7 No.2

Studies on the ship's automatic navigation & berthing control have been continued by way of solving the ship's mathematical model, but the results of such studies have not reached to our satisfactory level due to its non-linear characteristics at low speed. In this paper, the authors propose a new control system which can evaluate as closely as captain's decision-making by using the FNN(Fuzzy Neural Network) controller which can simulate captain's knowledge. This controller contains the concept of safety according to channel width. The learning data are drawn from ship Handling simulator(NavSim NMS-90 MK III) and represent the ship motion characteristics internally. According to learning procedure, the FNN controller can tune membership functions and identify fuzzy control rules automatically. The verified results show that the FNN controller is effective to incorporate captain's knowledge and experience of manoeuvrability in channel.

ON-DOCK 서비스 시스템이 부산항 경쟁력 향상에 미치는 영향

양원,이철영,Yang, W.,Lee, C.Y. 한국항해항만학회 1999 韓國港灣學會誌 Vol.13 No.1

Port competition is generally classified into two type of inter-domestic ports and intermational ports and the latter is measured how to secure the function of intermediacy for foreign cargoes among competing parts. In the Northeast Asia top 20 world container ports such as Pusan, Kobe, Yokohama and Kaohsiung are struggling to induce transshipment containers generated in the North China region. This paper aims to analyze and evaluate the competitive factors of the said ports such as port site facilities expenses service level and flexibility of management and operations and suggest the feasible strategies that the Pusan Port to be viable transshipment center in the region. The evaluation is attempted twice. First attempt is evaluated by present conditions of each port and second attempt by upgraded conditions of evaluation value such as port service level and flexibility of port management and operations resulted from the implementation of the ON-DOCK service system. The results of evaluation are as follows; (1) Port competitiveness of first evaluation is ranked in Kobe=Kaohsiung >Pusan>Yokohama. (2) Second evaluation is resulted in Kobe> Pusan= Kaohsiung>Yokohama. According to this results the competitiveness edge of the Pusan Port is able to strengthen by implementation of the ON-DOCk system.