• Title/Summary/Keyword: Port Cooperation

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A Layer-based Dynamic Unequal Clustering Method in Large Scale Wireless Sensor Networks (대규모 무선 센서 네트워크에서 계층 기반의 동적 불균형 클러스터링 기법)

  • Kim, Jin-Su
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.12
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    • pp.6081-6088
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    • 2012
  • An unequal clustering method in wireless sensor networks is the technique that forms the cluster of different size. This method decreases whole energy consumption by solving the hot spot problem. In this paper, I propose a layer-based dynamic unequal clustering using the unequal clustering model. This method decreases whole energy consumption and maintain that equally using optimal cluster's number and cluster head position. I also show that proposed method is better than previous clustering method at the point of network lifetime.

The Study on the Demand Investigation of the International Ship Instrument Distribution Center Construction (국제선용품 유통센터 건립 수요조사 연구)

  • Kang, Byung-Young;Kim, Chul-Min
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.8
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    • pp.2827-2834
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    • 2010
  • The purpose of this paper is as follow. The first is to investigate ship instrument supplier's and consumer's needs. The second is to study a feasibility of international ship instrument distribution center at Busan port. Therefore, the research scheme was experimented through a questionnaire survey answered by 878 companies. The results of this research indicate the necessity of ship instrument distribution center. The results of this study will be helpful for the success management of ship instrument distribution center.

Intake Port Flow Simulation of 2600cc Level Diesel Engine (2600cc급 디젤 엔진 흡기포트 유동해석)

  • Kim, Chang-Su;Park, Sung-Young
    • Proceedings of the KAIS Fall Conference
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    • 2012.05b
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    • pp.668-670
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    • 2012
  • 본 논문에서는 시작엔진 제작에 앞서 CFD기법을 이용하여 디젤 엔진 흡기포트의 유동 특성을 분석하고자 하였다. 유동 해석 결과 높은 밸브리프트에서는 흡기포트 곡률 최적화로 인해 흡입 공기량이 극대화되었으며, 낮은 밸브리프트에서는 스월 Chamfer를 적용하여 스월유동이 강화된 것을 확인할 수 있었다.

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Diesel Engine Intake-Port Analysis Using Reverse-Engineering Technique (리버스 엔지니어링을 통한 디젤엔진 흡기포트의 분석)

  • Park, Sung-Young;Kim, Yong-Tae
    • Proceedings of the KAIS Fall Conference
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    • 2012.05b
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    • pp.674-676
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    • 2012
  • 본 논문에서는 3차원 설계데이터가 부재한 디젤엔진 실린더 헤드의 흡기포트 데이터를 확보하기 위하여 리버스 엔지니어링 기법을 적용하였다. 획득된 해석 모델을 이용하여 디젤엔진 흡기포트에 대한 유동해석을 수행하였으며, 텀블 유동과 스월유동의 존재를 해석 결과로서 확인할 수 있었다. 이러한 기법의 적용은 향후 3차원 설계데이터가 부재한 엔진이나 경쟁엔진의 분석에 유용하게 적용될 수 있을 것으로 판단된다.

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Optimal Design Method of 1-Port Surge Protective Device Based on Zinc Oxide Varistor (선화아연바리스터 기반의 1-포트 서지보호장치의 최적 설계 기법)

  • Jeong, Tae-Hoon;Kim, Young-Sung;Park, Geun-Bo;Lee, Seung-IL
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.4
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    • pp.93-102
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    • 2018
  • This paper reports a Surge Protective Device (SPD) that is used to protect an automatic metering interface (AMI) power supplies of communication equipment on a low-voltage distribution system from a lightning current. The surge protective device (SPD) can be classified as one-port SPDs and two-port SPDs with decoupling elements depending on the connection type. The protection of internal systems against the lightning current may require a systematic approach consisting of coordinated SPDs. To deal with this, the definition of a lightning protection zone (LPZ) was studied and interpreted through a theoretical review. Because the lightning current resulting from a lightning surge is considerably high, there is limited protection from one SPD; therefore, coordinated cascaded MOV-based SPDs are installed to solve this problem. Regarding the power grid mentioned in this paper, a class II SPD for the low-voltage distribution system installed on the border of LPZ1 and LPZ2, which establish a protection coordination with the Arrester (LA, SA) that corresponds to the LPZO installed on the MOF stage connected to one system were designed to protect various communication (control) equipment, including the automatic meter reading system inside the branch-type electric supply panel of a building, not the incoming side of one system. In addition, performance-related tests were done by a comparison with the existing method through testing, and the optimal design was achieved for the 1-port SPD that uses a series connection and can bleed load current without any decoupling element.

Distribution of potential risky species on phytoplankton at ports in Korea (항만 환경에서 식물플랑크톤 잠재적 위해종의 분포)

  • Kwon, Oh Youn;Kang, Jung-Hoon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.1
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    • pp.506-510
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    • 2013
  • This study aimed to understand relationship between potential risky species and environmental factors at ports in Korea. During the study periods, 25 potential risky species (red tide and toxic species) representing 20 red-tide species, 5 toxic species were observed in the all ports. Skeletonema costatum (red-tide species) was predominated in all study area. This species showed positive correlation with pH, while negative correlation with dissolved oxygen (p<0.05) at Busan port. Also, this species showed positive correlation with total suspended solids and pH (p<0.05) at Ulsan port. However, Sk. costatum showed positive correlation with nitrate at Incheon port (p<0.01). Pseudo-nitzschia spp. producing amnesic shellfish poison (domoic acid) showed positive correlation with nitrate and silicate in all study areas (p<0.05). Alexandrium spp. (paralytic shellfish poison) and Dinophysis acuminata (diarrhetic shellfish poison) were affected by chemical oxygen demand (p<0.01). Our results indicated that red-tide species were affected by physical factors, while chemical factors affected toxic species.

A Study on the Advance Transportation System for Inter Terminal Transshipment: Focused on the Busan New Port (타부두 환적화물에 적합한 운송수단에 관한 연구;부산항 신항을 중심으로)

  • Jo, Mi-Ji;Lee, Seung-Pil;Kim, Hwan-Seong
    • Journal of Navigation and Port Research
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    • v.44 no.4
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    • pp.298-304
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    • 2020
  • The purpose of this study was to identify evaluation factors and analyze the relative importance among factors to select a suitable transportation method for transferring the increasing amount of transshipment at multiple terminals at the Busan new port. To accomplish this, the evaluation factors were selected through a literature survey and brainstorming of a group of experts associated with the port operation, and were classified into five major factors and 15 middle factors. The evaluation factors classified hierarchically were surveyed relative to workers in organizations such as shipping companies, port corporations, container terminals, and related ministries. The importance of each factor was calculated using the hierarchical analysis process (AHP). As a result of the importance analysis, priority was assigned in order of safety, productivity, investment efficiency, operational efficiency, and policy conformity. Through this, it was necessary to select a suitable transportation method for the transshipment cargo in terminals while focusing on the cargo and terminal security and preventing accidents. As a result of calculating from six ITT transportation candidates, the priority was determined in order of monorail, Autocon, and so on as ITT transportation suitable for the Busan new port..

A Study on the Korean Medical Institution's Strategies for Advancing into Free Port of Vladivostok (한국 의료기관의 블라디보스톡 자유항 진출에 관한 연구)

  • Shin, Tae Seop
    • The Korean Society of Law and Medicine
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    • v.17 no.2
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    • pp.221-255
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    • 2016
  • The Russian government enacted the 'Federal Law on the Free Port of Vladivostok' to improve the medical industry in the Far East in 2015. As a result, Korean medical institutions are increasingly interested in advancing into Free Port of Vladivostok. Increased demand for high-quality Korean medical services from Russian patients and the active government policy direction of the Russian government serve as strengths and opportunities for advancing into Free Port of Vladivostok. On the other hand, the legal imperfections caused by the delay in the establishment of sub-regulations for Federal Law on the Free Port of Vladivostok and the low reliability of the Russian government are both weaknesses and threats. Therefore, Korean medical institutions will need to carefully consider the timing of advancing into Free Port of Vladivostok by closely monitoring the process of establishing the sub-regulations of Federal Law on the Free Port of Vladivostok. And it is the most realistic model for Korean medical institutions to establish 'Professional clinic model linked with health screenings(1st stage model)'. The Korean government needs to conclude a 'MOU for Cooperation on Health and Medical Care between Korea and Russia' with the Russian government and should also carry out the 'Korean Minnesota Project'.

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A Study on the Formation and Influencing Factors of Ocean Governance in Busan, the Ocean Capital of Korea: A New Guide to Conflict Resolution Among Busan Marine Stakeholders (해양수도 부산의 해양거버넌스 형성수준 및 원인분석: 이해관계자의 '접촉과 갈등해결'을 중심으로)

  • Woo, Yang-Ho;Kang, Yun-Ho
    • Journal of Navigation and Port Research
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    • v.36 no.3
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    • pp.233-243
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    • 2012
  • The purpose of this study was to confirm that the formation and influencing factors of ocean governance in Busan. Recently it has been observed that the concept of ocean governance increasingly popular in the field of maritime administration, as the concept helps us understand more comprehensively the new or emerging roles of the government and other stakeholders(private enterprise, citizen, etc) in a rapidly changing environments. Therefore, this study aims to investigate the status of ocean governance and draw alternatives in applying appropriate ocean governance structure of maritime administration in Busan. The result of this study shows that ocean governance level in Busan was not high in some factors such as participation, cooperation, collective decision making. This is caused by the lack of a ocean governance structure. Based on these significant research findings, theoretical and practical implications were discussed.

A Study on Decision-Making Model for Port Selection : Container Terminal's Perspectives (터미널 운영사 측면에서의 컨테이너 터미널 자동화 결정모형 연구)

  • You, Ji-Won;Kim, Yul-Seong
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2019.05a
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    • pp.138-139
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    • 2019
  • In the era of the 4th industrial revolution, automated technology innovation is emerging, and container terminals are being developed to introduce automation equipment and systems. With the advent of ultra-large vessels, terminals around the world are seeking to build port infrastructure by combining automated technology in order to attract more cargo and to enhance competitiveness to provide prompt service. To introduce automated technology that is emerging as a high-tech industry, this study proposes a structural equation model for the decision to introduce automated container terminal and conducts a questionnaire survey on workers engaged in terminal operators for empirical analysis. This paper presents the role and direction of guidelines for introduction of automated container terminal through decision model.

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