• Title/Summary/Keyword: e-Hub

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Comparison of Aerodynamic Loads for Horizontal Axis Wind Turbine (II): with and without Vertical Wind Shear Effect (수평축 풍력터빈의 공력 하중 비교 (II): 수직 전단흐름 효과의 유·무)

  • Kim, Jin;Kang, Seung-Hee;Ryu, Ki-Wahn
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.44 no.5
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    • pp.399-406
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    • 2016
  • The large scale wind turbine blades usually experience periodic change of inflow speed due to blade rotation inside the ground shear flow region. Because of the vertical wind shear, the inflow velocity in the boundary layer region is maximum at uppermost position and minimum at lowermost position. These spatial distribution of wind speeds can lead to the periodic oscillation of the 6-component loads at hub and low speed shaft of the wind turbine rotor. In this study we compare the aerodynamic loads between two inflow conditions, i.e, uniform flow (no vertical wind shear effect) and normal wind profile. From the computed results all of the relative errors for oscillating amplitudes increased due to the ground shear flow effect. Especially bending moment and thrust at hub, and bending moments at LSS increased enormously. It turns out that the aerodynamic analysis including the ground shear flow effect must be considered for fatigue analysis.

Data hub system based on SQL/XMDR message using Wrapper for distributed data interoperability (분산 데이터 상호운용을 위한 SQL/XMDR 메시지 기반의 Wrapper를 이용한 데이터 허브 시스템)

  • Moon, Seok-Jae;Jung, Gye-Dong;Choi, Young-Keun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.11 no.11
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    • pp.2047-2058
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    • 2007
  • The business environment of enterprises could be difficult to obviate redundancy to filtrate data source occurred on data integrated to standard rules and meta-data and to produce integration of data and single viewer in geographical and spatial distributed environment. Specially, To can interchange various data from a heterogeneous system or various applications without types and forms and synchronize continually exactly integrated information#s is of paramount concern. Therefore data hub system based on SQL/XMDR message to overcome a problem of meaning interoperability occurred on exchanging or jointing between each legacy systems are proposed in this paper. This system use message mapping technique of query transform system to maintain data modified in real-time on cooperating data. It can consistently maintain data modified in realtime on exchanging or jointing data for cooperating legacy systems, it improve clarity and availability of data by providing a single interface on data retrieval.

A Study of China's Condition as the Logistics Hub of Northeast Asia and a Development Strategy (중국의 동북아 물류중심화 현황과 발전전략에 관한 연구)

  • Oh, Moon-Kap
    • Journal of Distribution Science
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    • v.12 no.2
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    • pp.95-103
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    • 2014
  • Purpose - Korea has a better geographical location than other nations in the Northeast Asian region. This means that Korea has an opportunity to become the center of international physical distribution in Northeast Asia. Korea should take advantage of this opportunity by exploring appropriate strategies to achieve this goal, assuming government willingness, with a view to capitalizing on the geographical advantage of the Korean peninsula and constructing a comprehensive physical distribution network system. If we prepare for this scenario, Korea could become the center of international physical distribution in Northeast Asia. Research design, data, and methodology - This study has the purpose of determining how shipping companies form partnerships with third-party logistics providers, and the relevant implications. The survey methods used were personal interview and a questionnaire distributed through e-mail, fax, mail, and telephone. A total of 600 questionnaires were distributed, out of which 285 were returned. Of the collected questionnaires, 10 were excluded because of insufficient content, leaving 275 to be used in the study as available valid samples. The data that was collected from these samples was analyzed using the data coating process and by employing a statistical package program. Results - Flexible policies, administration, and systems will be needed to create better business practices. In this dissertation, first and foremost, the results reveal that in order to become the center of Northeast Asian logistics, Korea must transition into a new paradigm based on the current economic and social systems that have stemmed from bureaucracy, inflexibility, chauvinism, and egalitarianism. Flexible policies, administration, and systems will be required to create better business practices. Domestic logistics corporations need to occupy a strategic logistics hub, create a logistics network, and activate value-added logistics business strategies by ensuring significant manpower and by building a logistics information system to strengthen their competitive edge, creating an improved system. Conclusions - In this dissertation, first and foremost, we point out that in order to become a center of North East Logistics, Korea should change to a new paradigm from the old one based on current economic and social systems that have stemmed from bureaucracy, inflexibility, chauvinism, and egalitarianism. More reasonable business laws, systems, and policies based on market-driven flexibility and transparency should be created. Moreover, social norms and rules should be reasonably established, to accomplish political and social security. Korea has to cultivate a culture of tolerance for foreign companies. This involves a change of paradigm for the development of the capital city and satellite cities. It will take a powerful task force or organization to plan and execute the vision that aims to meet these needs, accomplish the necessary goals, use the appropriate system effectively, and make Korea a key country in the field of Northeast Asian logistics.

A Study on the Realization of Infrastructure for Electronic Trade (전자무역 기반사업의 구현에 관한 연구)

  • Lee, Bong-Soo
    • International Commerce and Information Review
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    • v.12 no.1
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    • pp.55-73
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    • 2010
  • The thesis examines new innovation of various aspect to overcome lots of problems which come by when we execute simplification of trade procedure and administration fairly. Practical implications regarding the innovation of electronic trade infrastructure are as follows. First, it will propel the standardization of electronic trade section in the technical side and the construction atmosphere of international authentication system must be created. The work process should be redesigned in order to implement export-import procedures that meet the relevant standards. Second, the improvement of system for electronic process is necessary in the law and institutional aspect. In order to eliminate any obstacles to the trade procedure, clearer legal grounds regarding legitimate controls and minimum necessity must be established. Also, laws should be revised to admit mutual recognition among certification organizations, in lieu of international agreement-based mutual recognition between government. Third, the detailed improvement for the integration of the electronic trade infrastructure will be demanded. Additionally, user-centered quality management protocols should be established via connections with the systems already existing in governmental bodies. Fourth, various trade institution should harmonized and interconnected with other partners through mutual cooperation for standardization of operational system. A system which can monitor and remotely diagnose and resolve system errors should be established to provide tailor-made service and improve operational efficiency. At the same time, it is necessary to build a cooperative system to share information and promote comprehensive management for efficient operation.

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A Study on the Growth of Air Cargo Volume and the Development Plan for Regional Airport Focusing on Cheonng-Ju Int'l Airport (항공화물 활성화를 위한 정책분석과 지방공항 발전방안 연구: 청주국제공항을 중심으로)

  • Won-Tae Park;Yeon-Young Sung;Sung-Sik Park
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.32 no.2
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    • pp.112-123
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    • 2024
  • Responding to rapid changes of global supply chain and fast increasing air cargo volume and demand for e-commerce market, this paper researched the development plans for regional airport specially focused on air cargo logostics through policy research. According to this research, political implications and development plans for Cheong Ju airport (CJJ) to become a part of global supply chain, a regional air cargo hub. Firstly, it is necessary to increase the length of the existing runway from 2,744m to 3,200m or to develop 3rd runway only for a civil aircraft use. Secondly, it is inevitable to develop new air cargo terminal to handle and export such high value-added products as semi-conductor or rechargeable battery through airport. In addition, facing re-shoring trends among global supply chain, CJJ can increase its air cargo volume and also provide feeder service to Incheon airport, inducing global distribution center near airport site.

Nonlinear variable structure system control for flexible link robot manipulators (유연성 로봇 매니퓰레이터에 대한 비선형 가변구조제어)

  • 김성태;임규만;함운철
    • 제어로봇시스템학회:학술대회논문집
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    • 1997.10a
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    • pp.280-284
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    • 1997
  • In this paper, Nonlinear VSS control based on bang-bang control concept is derived under the assumption that the control input is bounded. We try to derive control algorithm which has almost same performance as the time optimal control. We focus this control scheme on the real implementation of DC motor position controller of flexible link, i.e. we obtain the switching curves from the real data of DC motor system operating under the full maximum and minimum applied voltages. State space is separated into several regions and we set different switching surfaces in each region to reduce chattering problem. The efficiency of the proposed controller is compared with PID controller and it is shown that the controller converges fast than PID controller without chattering. The hybrid controller scheme is also proposed not only to control the position of hub but also to reduce the vibration of end tip of flexible link.

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Inno-NET (종합기업서비스정보망)

  • 이태석;신기정;박찬진
    • Proceedings of the CALSEC Conference
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    • 2000.08a
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    • pp.335-359
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    • 2000
  • ◆ 기술 중심의 지식집약형 중소ㆍ벤처기업이 경제발전을 주도 ◆ 기업지원 기능의 부처, 기관별 분산 및 서비스 일관성 부족 →기업활동에 필요한 정보획득 및 애로사항 해소의 어려움 ◆ 창업, 자금 등 기업활동에 필요한 정보의 적시공급 및 기업애로사항을 신속히 해결 할 수 있는 종합기업서비스정보망 구축ㆍ운영 필요 : '97. 3월 대통령 주재 경제장관회의 보고 ◆ 종합기업서비스센터(산자부 중소기업정책반) 설치ㆍ운영 Inno-NET 구축사업 착수('97년 8월 1일 시범서비스 개시) - 1차 1998. 7. 1 - 1999. 6. 30, - 2차 1999. 7. 1 - 2000. 6. 30 ◆ 기업의 애로를 효율적으로 해소할 수 있도록 정부 및 관련 공공기관들을 상호 연계한 현장밀착형 양방향서비스정보망 구축(기업정보제공+종합안내정보+민원 및 애로상담 기능+지역기술정보) ◆ 체계화된 범국가적ㆍ지역별 종합기업지원 정보 서비스 체제 구축 ◆ 지방업체의 기술경쟁력 제고를 위한 지역별 산업기술정보 DB 및 기업지원 전문정보 DB 구축 ◆ EIP(Enterprise Information Portal) 정보제공 및 애로해소를 위한 종합적이고 전문적인 기업지원 포탈시스템 구축(중소벤처기업지원 나침반-HUB 기능)(중략)

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Using the PubAnnotation ecosystem to perform agile text mining on Genomics & Informatics: a tutorial review

  • Nam, Hee-Jo;Yamada, Ryota;Park, Hyun-Seok
    • Genomics & Informatics
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    • v.18 no.2
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    • pp.13.1-13.6
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    • 2020
  • The prototype version of the full-text corpus of Genomics & Informatics has recently been archived in a GitHub repository. The full-text publications of volumes 10 through 17 are also directly downloadable from PubMed Central (PMC) as XML files. During the Biomedical Linked Annotation Hackathon 6 (BLAH6), we experimented with converting, annotating, and updating 301 PMC full-text articles of Genomics & Informatics using PubAnnotation, a system that provides a convenient way to add PMC publications based on PMCID. Thus, this review aims to provide a tutorial overview of practicing the iterative task of named entity recognition with the PubAnnotation/PubDictionaries/TextAE ecosystem. We also describe developing a conversion tool between the Genia tagger output and the JSON format of PubAnnotation during the hackathon.

Packing Industry Realize Plan of Gwang Yang Bay (광양만권의 패키징산업화 구현 방안)

  • Park, Hong-Gyun
    • Journal of Korea Port Economic Association
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    • v.21 no.4
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    • pp.103-119
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    • 2005
  • For the selection of attraction industry of foreign investment in the free trade zone of Gwang Yang Bay, an overall consideration should be made considering aspects such as the industry development strategy of Gwang Yang Bay and the regional industry development strategy of the local government. For Gwang Yang Bay to grown into the E-Hub Port of Northeast Asia, the development of the back zone of should be accelerated. There is a need to offer custom made incentives for the core businesses. Packaging is a field of combined science and a future industry. Packaging industry, which has close association with regional industry and regional college's research human resources, should be combined with design and set up a packaging industry complex.

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