• 한국통신학회논문지
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• 제38C권5호
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• pp.440-451
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• 2013

최근 해상안전을 위한 국제적 기술 개발 및 표준화가 활발하게 진행되고 있다. 특히 e-Navigation을 지향한 기술들이 개발되고 있으며 국내에서도 차세대 해상교통관제기술개발의 필요성이 제기되고 있다. 그리고 현재 국내 환경에 맞는 차세대 VTS (Vessel Traffic Service)를 진행하기 위해서는 국내 VTS 센터의 관제사로부터 요구사항을 수렴하여 이를 시스템 개발에 적용할 필요성이 요구되어 왔다. 따라서 본 논문은 차세대 VTS의 요구사항을 정의하기 위해 15개 국내 해상교통 관제센터로부터 요구 사항을 수렴하고 항행지원 위주의 결과를 분석하여 그 결과를 제시하고자 한다. 그리고 항행지원 요구 사항 분석을 통해 새로운 항행지원 서비스로서 기존 VTS 시스템에서 지원하지 않았던 차세대 VTS용 ASM(Application Specific Messages) 서비스를 제안하고 이를 구현하여 AIS 실제 장비와 연동 및 시뮬레이션 단말시험을 통해 그 가능성과 효과를 검증하고자 한다.

• International Journal of Internet, Broadcasting and Communication
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• 제14권1호
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• pp.85-94
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• 2022

Recently, consumers who prefer contactless consumption are increasing due to pandemic trends such as Corona 19. This is the driving force for developing the last mile-based logistics ecosystem centered on the online e-commerce market. Lastmile led to the continued development of the logistics industry, but increased the amount of cargo in urban area, and caused social problems such as overcrowding of logistics. The courier service in the logistics base area utilizes the process of visiting the delivery site directly because the courier must precede the loading work of the cargo in the truck for the delivery of the ordered product. Currently, it's carried out as automated logistics equipment such as conveyor belt in unloading or classification stage, but the automation system isn't applied, so the work efficiency is decreasing and the intensity of the courier worker's labor is increased. In particular, small-scale courier workers belonging to the sub-terminal unload at night at underdeveloped facilities outside the city center. Therefore, the productivity of the work is lowered and the risk of safety accidents is exposed, so robot-based loading technology is needed. In this paper, we have derived the top-level concept and requirements of robot-based loading system to increase the flexibility of logistics processing and to ensure the safety of courier drivers. We defined algorithms and motion concepts to increase the cargo loading efficiency of logistics sub-terminals through the requirements of end effector technology, which is important among concepts. Finally, the control technique was proposed to determine and position the load for design input development of the automatic conveyor system.

• 한국인터넷방송통신학회논문지
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• 제23권5호
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• pp.41-46
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• 2023

레이다 시스템에서 최대 탐지거리를 충족하는 것은 매우 중요하다. 최대 탐지거리를 충족하기 위해서는 레이다 시스템의 수신신호에 대한 민감도가 높아야 한다. 또한 레이다 신호처리기에서 동적 영역이 넓어야 한다. 이러한 요구사항을 충족하기 위해서는 신호처리기 보드가 외부 및 내부 노이즈에 강인하게 설계되어야 한다. 특히 보드 내부에서 여러 스위칭 회로로 인하여 발생되는 잡음이 수신되는 레이다 신호에 영향을 최소화 하기 위한 설계가 필요하다. 본 논문에서는 레이다 시스템 성능을 충족하기 위하여 신호처리기 보드의 요구사항을 도출하고 도출된 요구사항을 충족하기 위한 설계에 대하여 기술한다. 또한 외부에서 입력되어 들어오거나 내부에서 생성되는 노이즈의 영향을 최소화 하기 위한 EMC 설계에 대하여 기술한다. 제작된 보드의 시험을 통하여 확보된 성능을 확인한다.

• 시스템엔지니어링학술지
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• 제11권2호
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• pp.85-93
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• 2015

Warehouse Management System (WMS) is a key control for Material Handling System (MHS) and Inventory Control System (ICS). How to design and implement for WMS is crucial factor for achieving the key performance index for Manufacturing Industry. In particular, iron and steel making industry, where the volume and weight is large and hence FIFO (First Input First Out) is not working, how to design WMS is a key factor. In this paper, we systematically define the problem of WMS via developing StR (Stakeholders' Requirements) or ORD (Operational Requirement Documents), SyR (System Requirement), and SA (System Architecture) based on the emerging technologies. In particular, IoT (Internet of Things), CPS (Cyber Physical System) concepts and enabling technologies haves been incorporated in developing Smart WMS. The deliverables of the research can provide a conceptual framework for developing the next generation industrial WMS.

• Corrosion Science and Technology
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• 제14권6호
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• pp.288-295
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• 2015

The present work addresses crevice and galvanic corrosion processes occurring at the cylinder head gasket/cylinder head interface and cylinder head gasket/cylinder liner interface of four-stroke medium-speed diesel engines for marine applications. The contact between these systems and the marine environment can promote formation of demanding corrosion conditions, therefore influencing the lifetime of the engine components. The electrochemical behavior of various metals and alloys used as head gasket materials (both ferrous alloys and copper alloys) was investigated. The efficacy of corrosion inhibitors was determined by comparing electrochemical behavior with and without inhibitors. In particular, crevice corrosion has been investigated by electrochemical tests using an experimental set-up developed starting from the requirements of the ASTM G-192-08, with adaptation of the test to the conditions peculiar to this application. In addition to the crevice corrosion resistance, the possible problems of galvanic coupling, as well as corrosive reactivity, were evaluated using electrochemical tests, such as potentiodynamic measurements. It was possible to quantify, in several cases, the corrosion resistance of the various coupled materials, and in particular the resistance to crevice corrosion, providing a basis for the selection of materials for this specific application.

• International Journal of Ocean System Engineering
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• 제3권4호
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• pp.175-187
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• 2013

Moonpools are vertical wells in a floating body used onboard many types of vessels like Exploration and drilling vessels, Production barges, Cable-laying vessels, Rock dumping vessels, Research and offshore support vessels. Moonpool gives passage to underwater activities for different types of ships as per their mission requirements. It is observed that inside a moonpool considerable relative motions may occur, depending on shape, depth of the moonpool and on the frequency range of the waves to which the ship is exposed. The vessel responses are entirely different in zero and non-zero Froude number. Former situation is paid attention in this study as the mission requirement of the platform is to be in the particular location for long period of operation. It is well known that there are two modes of responses depending on the shape of the moonpool viz., piston mode for square shape and sloshing mode for rectangular shapes with different aspect ratios of opening like 1:1.5 and 1:2 ratios. Circular shaped moonpool is also tested for measuring the responses. The vessel moored using heavy lines are modelled and tested in the wave basin. The pretensions of the lines are varied by altering the touchdown points and the dynamic tensions on the lines are measured. The different modes of oscillations of water column are measured using wave gauge and the vessel response at a particular situation is determined. RAOs calculated for various situations provide better insight to the designer.

• Ocean Systems Engineering
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• 제3권2호
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• pp.137-147
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• 2013

Moonpools are vertical wells in a floating body used onboard many types of vessels like cable-laying vessels and offshore support vessels. Moonpool gives passage to underwater activities for different types of ships as per their mission requirements. It is observed that inside a moonpool considerable relative motions may occur, depending on shape, depth of the moonpool and on the frequency range of the waves to which the ship is exposed. The vessel responses are entirely different in zero and non-zero Froude number. Former situation is paid attention in this study as the mission requirement of the platform is to be in the particular location for long period of operation. It is well known that there are two modes of responses depending on the shape of the moonpool viz., piston mode for square shape and sloshing mode for rectangular shapes with different aspect ratios of opening like 1:1.5 and 1:2 ratios. Circular shaped moonpool is also tested for measuring the responses. The vessel moored using heavy lines are modeled and tested in the wave basin. The moored lines are provided with pre-tension and the dynamic tensions on the lines are measured. The different modes of oscillations of water column are measured using wave gauge and the vessel response at a particular situation is determined. RAOs determined for various situations provide better insight to the designer. The experiments done in the wave basin may also be compared with a software package meant for handling moored floating bodies.

• 한국대기환경학회지
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• 제24권1호
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• pp.108-121
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• 2008

On January 1, 2005, the Korean Ministry of Environment put into operation a comprehensive program, so called 'Blue Sky 21' project, for the improvement of air quality in greater Seoul metropolitan area. This program was legally based on the 'Special Act on Metropolitan Air Quality Improvement' for Greater Seoul area, which was established in 2003, and should be updated every 10 years. The principal objective of this program is to improve the air quality in Seoul and surrounding area by 2014 to the levels of air quality in Tokyo and Paris, with particular emphases on reducing the concentrations of nitrogen dioxide and $PM_{10}$. Any regulation of the emission of toxic air pollutants in general, and $NO_2$ and $PM_{10}$ in particular, should be based on human exposure levels and consequential health effects. In this article, the contents and feasibility of the special program were critically evaluated with respect to the reduction of health risks. Important issues for improving not only air quality but public health are discussed, and future requirements for the success of the special program are suggested.

• Journal of Korea Trade
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• 제24권2호
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• pp.15-30
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• 2020

Purpose - This paper investigates the theories and practices of Most-Favored-Nation (MFN) clauses. The MFN clause became a controversial issue during the past two decades, especially in the context of investment arbitration. This paper aims to clarify a reasonable way to apply MFN clauses. It in particular focuses on the territoriality requirements and the scope of investment activity which are common features included in most of investment treaties. Design/methodology - This paper analyses two investment arbitration cases, Ansung Housing and Beijing Urban Construction. Through the case study, this paper reveals limitations of the currently dominant views on the operation of MFN clauses. It then tries to reconstruct the system of MFN application within the relevant arbitration principles. Findings - Tribunals of recent investment arbitration as represented in the two cases above employed strict literal interpretation of the treaty provisions, especially of the phrase "in its territory". This paper finds a more functional interpretation is appropriate and consistent with theories of public international law and developments of global economy. Originality/value - Existing studies either stuck to literal interpretation or suggested more flexible interpretation of the phrase "in its territory" without full explanation. This paper tries to fill the gap in the existing discussion by analyzing legal foundations and theoretical structure for an effective interpretation of MFN clauses.

• 한국정보과학회논문지:소프트웨어및응용
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• 제33권7호
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• pp.589-604
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• 2006

소프트웨어 재사용을 위한 새로운 패러다임으로서 대두되고 있는 소프트웨어 프로덕트 라인에서 가장 중요하며, 기본이 되는 것은 바로 재사용 가능한 소프트웨어 자산을 개발하기 위한 프로덕트 라인의 공통성과 가변성 식별이라고 하겠다. 현재 이를 위해 휘처 중심의 도메인 분석 방법이 많이 사용되고 있으나, 이 방법은 휘처를 식별하고, 식별된 휘처의 근거를 제시하기 위한 체계적인 방법을 제공하지 못하고 있다. 또한 프로덕트의 공통성과 가변성 분석 결과가 프로덕트 라인 개발 조직의 최상위 수준 목표(goals)를 만족시키고, 그 근거를 보여줄 수 있어야 하지만 현재 이러한 부분에 대한 연구가 부족한 실정이다. 따라서 본 논문에서는 기존의 휘처 중심의 도메인 분석 방법에서의 문제점들을 해결하고, 보안하기 위해 프로덕트 라인을 위한 목표, 시나리오, 휘처 기반의 도메인 분석 방안을 제안하였다. 이것은 목표와 시나리오 그리고 휘처의 관계를 통하여 프로덕트 라인을 위한 도메인 요구사항 모델(DRM: domain requirements model)을 제시하고, 그러한 모델을 바탕으로 도메인 요구사항 모델링 방법(domain requirements modeling method)을 제안한다. 마지막으로는 제안된 방안을 지원하는 도구 (IDEAS)를 설명하고, 이를 통해 주택 통합 시스템(HIS)에 적용함으로써 제안된 방법을 검증하였다. 제안된 방법은 체계적으로 휘처를 식별하고, 그에 대한 근거 및 공통성과 가변성에 대한 근거를 제공할 수 있을 것이다.