• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1105-1114
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• 2007

Recently the urban railroad which is under plan and construction in domestic is under consideration Light Rail Transit mostly with the alternative against excess of working expenses of Midium Rail Transit(subway), inefficient transportation problem etc. It come to a conclusion that the application of the light rail transit is proper from reserve feasibility study and approval process of Master plan in Daegu urban railroad Line No.3 Based on hereupon, carried out the detail investigation for optimum system selection which suitable for Daegu urban circumstance in process of master plan can satisfy the working expenses decided in national expenditure support project.

• 품질경영학회지
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• 제38권4호
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• pp.531-539
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• 2010

Mega-Y project is very important for a company to gain a competitive advantage in markets or to achieve drastic change in the internal processes. It stems from the company strategy and annual management goals or key performance measures, and is proceeded by the cross-functional team. This paper presents the success factors and implementation process of the Mega-Y projects. The implementation process is presented in 5 steps, including project selection, cross-functional team building, establishment of the master plan, development and execution of sub-projects, and project completion. A case study on the cost reduction project of aircraft development is presented to help for the practitioners to deploy the implementation process introduced in this paper.

• 산업공학
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• 제6권2호
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• pp.19-35
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• 1993

This paper presents the development of a knowledge-based expert system to assist for designer in the process of designing products for easier assembly. The developed expert system for supporting assembly-oriented product design, which is named as DFA-MASTER, consists of two subsystems such as "Assembly Method Selection System" which provides feasible assembly methods to designer and "DFA-Analysis System" which provides guidelines to improve assemblability of products in the early stage of product design. The developed system is interfaced with AutoCAD system and can be run under PC environments. By using DFA-MASTER, designer can obtain feasible assembly methods which have high assemblability under the given asssembly conditions and also evaluate the assemblability of part feature or product structure.

• Journal of Power Electronics
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• 제19권6호
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• pp.1582-1590
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• 2019

A new method for reducing the common-mode current generated by the voltage variations in a two-inverter air conditioner system by applying a synchronized pulse-width modulation (PWM) strategy is proposed. The PWM signals of the master-mode inverter are generated based on the reference voltage, while those of the slave-mode inverter are output in the opposite direction when the master-mode inverter changes its switching state. However, the slave-mode control results in a mismatch between the reference voltage and the actual output voltage that is modified by synchronized control operation. The proposed method is capable of reducing and controlling this voltage error by performing signal selection in the vector space of the slave-mode inverter, which mitigates the distortion of the phase current. The efficacy of this method in reducing conducted emissions has been validated both theoretically and experimentally.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 1989년도 추계학술발표회 발표논문초록집; 이화여자대학교, 서울; 23 Sep. 1989
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• pp.25-29
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• 1989

본 고에서는 다차원 개체 clustering문제에 있어서 개체간 관계가 확률적이고 가중치가 부여된 경우를 위한 기대차이등급 clustering기법을 제시하였다. 기대차이등급 clustering기법은 해법의 필요성에 비해 상대적으로 해법개발이 미진한 분산정보시스팀을 대상으로 한 전산화 master plan의 수립이나 기계-부품 그룹형성, FMS에서의 주문선정(Part Type Selection)등에 기여할 수 있을 것으로 기대된다. 반면 해법의 타당성 검토를 위한 이론적 연구가 제시되지 않아 추후 이의 보완을 위한 연구가 요망된다.

• 수산해양기술연구
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• 제51권3호
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• pp.387-395
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• 2015

Starfish, a species of Echinoderm, is widely known as a predator on benthic invertebrate. A series of fishing experiments was carried out in the western coastal waters of Korea from September, 2011 to November, 2012, using the drum-shaped pots of different mesh sizes (17.1, 24.8, 35.3, 39.8, and 48.3 mm) to describe the composition of the catch species and the mesh selectivity of the pot for starfish. Some species including fish, crab, and starfish were caught in the experimental pots. The SELECT (Share Each Length's Catch Total) method was applied to describe the selectivity of the pot for starfish Asterina pectinifera. The master selection curve was estimated to be s(R) = exp(10.358R-4.086) / [1+exp(10.358R-4.086)], where R is the ratio of arm length to mesh size. The relative arm length of 50% retention was 0.395, and the selection range was 0.212. The results should be helpful to understand the relationship between the catch size of starfish and the mesh size of pot.

• 수산해양기술연구
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• 제50권3호
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• pp.284-291
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• 2014

Finely-striate buccinum Buccinum striatissimum, a species of whelks, is caught mainly by pot in the eastern coastal waters of Korea. In order to determine the size selectivity of pot for the species, comparative fishing experiments were conducted near Yeongil Bay from June to September in 2003 using the dome-shaped pots with different five mesh sizes (17.1, 24.8, 35.3, 39.8, and 48.3 mm). The parameters of logistic equation were estimated by the SELECT (Share Each Length's Catch Total) method based on a multinomial distribution. The model with the estimated split parameter was found to fit the catch data best. The master selection curve was estimated to be s (R)=exp (13.044R-16.438)/[1 + exp (13.044R-16.438)], where R is the ratio of shell height to mesh size. The relative shell height of 50% retention was 1.260, and the selection range was 0.168. Enlargement in mesh size of the pot allows more small-sized whelks to escape.

• 수산해양교육연구
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• 제9권1호
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• pp.71-82
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• 1997

최근 오징어는 주요 대상어종이 되고 있으므로, 동중국해와 우리 나라 남해에서 어획되는 Short-finned squid와 Long-finned squid에 대해 분석하였다. 조업시험은 실습선 새바다호를 이용하여 다이아몬드형 망목에 의한 조업시험은 망목의 크기가 A(51.2mm), B(70.2mm), C(77.6mm), D(88.0mm), E(111.3mm)인 5종의 끝자루를 제작하여 1991년 6월부터 1992년 12월 중에 행하였으며, 정방형망목에 의한 조업시험은 망목의 크기가 A(51.2mm), B(70.2mm), C(77.6mm), D(88.0mm)인 4종의 끝자루를 제작하여 1992년 7월부터 1994년 6월 중에 행하였다. 다이아몬드형 망목과 정방형 망목의 끝자루에 Cover net를 부착하고 Trouser방식으로 실시하였다. 분석한 결과를 요약하면 다음과 같다. 1. 동장이 201mm 이상 되는 도피율은 D Type가 A type 보다 Short-finned squid는 55%, Long finned squid는 46% 컸다. 2. Short-finned squid의 어획량은 한국남해가 동중국해 보다 2.5배 많았으며, Long-finned squid는 동중국해가 한국남해 보다 14.3배 많았다. 3. 다이아몬드형 망목의 선택성곡선에서 Short-finned squid의 평균 선택동장 49mm, 평균 50% 선택동장 141mm 이었으며, Long-finned squid의 평균 선택동장 48mm, 평균 50% 선택동장 122mm 이었다. 정방형 망목의 선택성곡선에서 Short-finned squid의 평균 선택동장 67mm, 평균 50% 선택동장 156mm 이었으며, Long-finned squid의 평균선택 동장 60mm, 평균 50% 선택동장 137mm 이었다. 4. Short-finned squid에 대한 Master curve 선택성곡선 에서 다이아몬드형 망목은 기울기 3.01, 선택계수 2.10 이었으며, 정방형 망목은 기울기 1.82, 선택계수 2.37 이었다. Long-finned squid에 대한 Master curve 선택성곡선에서 다이아몬드형 망목은 기울기 3.11, 선택계수 1.81 이었으며, 정방형 망목은 기울기 2.35, 선택계수 2.08 이었다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2000년도 춘계공동학술대회 논문집
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• pp.135-138
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• 2000

This paper is intended to propose what manufacturing configuration (manufacturing planning and shop floor control) is suitable for the tire industry. Basically tire-manufacturing process is mixed-products, parallel-disconnected-flow-shop. Both throughput time and cycle tine are very short, the variety of tires is very high, the setup time is long, shop floor data reporting requirements is high, and there are many equipments and people working. And with no exception, tire industry also now confronts increasing requirements of delivery conformance with the above peculiar characteristics of tire manufacturing and changing market environments, this paper suggests, weekly master scheduling with no MRP is desirable and traditional kanban is right selection for shop floor control/scheduling. This paper describes why this configuration should be, using the manufacturing engineering principles and some new insights like four primitives of parallel flow shop. Generally known that shop with high parallel-product-mix and long setup time isn't good candidate for kanban. The four primitives of parallel flow shop explain why kanban is also useful scheduling technique in that environment.

• 수산해양기술연구
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• 제55권4호
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• pp.285-293
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• 2019

The mesh selectivity of hairtail (Trichiurus lepturus) caught by coastal drift gill net was examined in field experiments with three different mesh sizes (45, 50 and 55 mm) from October to November, 2013 in the coastal areas of south-west of Jeju province. The mesh selectivity tests were conducted with the experimental net to be set middle part of conventional driftnets. The mesh selectivity tests were carried out the total of four times. The selectivity curve was estimated by the Kitahara's and Fujimori's method. In the results, the catch number of hairtail was 653 (125.8 kg) and occupied 34.8% in total catches weight. The optimal mesh size for 50% selection on the minimum landing size (180 mm, AL) and the first maturity size (260 mm, AL) of hairtail were estimated as 47.2 mm and 64.5 mm by master selectivity curves, respectively.