• Journal of Mechanical Science and Technology
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• 제20권10호
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• pp.1626-1637
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• 2006

The pressure pulsation due to the gear geometry of the gerotor (generalized rotor) pump mainly occurs in an instant that the chamber of the gerotor enters the delivery port and leaves the suction one. Such a pressure pulsation may result in undesirable vibration and noise of pump components as well as cavitation in hydraulic system. Therefore, it is very important to examine the pressure characteristic of the gerotor pump at its design and analysis stages. In this paper, in order to reduce the pressure pulsation in the gerotor pump, the port plate with the relief grooves is designed by referring to as notch of vane pump and relief groove of piston pump. A series of the theoretical analyses on the pressure pulsation is performed in consideration of various design parameters of the port plate, including the installation positions of the port inlet/outlet and the groove width, and the operating conditions such as rotational velocity and delivery pressure.

• 한국항해항만학회지
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• 제30권7호
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• pp.591-598
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• 2006

Port development has been remarkably increasing due to the progress of industrialization in ASEAN area. Especially, Vietnam has increased the international physical distribution in this area rapidly. The main issues facing decision makers at container terminals in Vietnam are how to expand the existing container terminals and construct new container terminals. In this paper, we performed the basic design based on simulation analysis in order to support the expansion of Quy Nhon port in Vietnam as a case study. The preliminary capacity analysis was conducted on the one berth at the port to analyze the scale of C/C(Container Crane)and yard area. Alternative scenarios were created based on the preliminary capacity analysis and the detailed simulation analysis was conducted for supporting the scenarios.

• 한국항만학회지
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• 제4권1호
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• pp.59-65
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• 1990

• 설비공학논문집
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• 제27권6호
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• pp.300-306
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• 2015

For an asymmetric scroll compressor for heat pump application, a numerical simulation was carried out to investigate the effects of injection port design on the compressor's performance under gas injection. To validate the simulation, the numerical results were compared with experimental results obtained from a scroll compressor with a base injection port design. There was good agreement between simulation and experimental results, with around a 1% difference in the injection mass flow rate when the injection pressure was below $12kgf/cm^2A$ for the heating mode. Various injection port angular positions were numerically tested to yield better injection performance. The largest improvement in heating capacity was obtained at angles of $240^{\circ}$ and $200^{\circ}$ inward from the scroll wrap end angle for low-temperature and standard heating conditions, respectively, while the maximum COP improvement was at $365^{\circ}$ and $280^{\circ}$, respectively. A considerable improvement in cooling capacity was also found at the injection port angle of $240^{\circ}$.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2005년도 추계학술대회 논문집
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• pp.125-131
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• 2005

게이트 운영은 수출 컨테이너를 위한 시작점이면서 수입 컨테이너의 종착점으로 컨테이너의 확인과 통제가 필요한 중요한 시설물이다. 본 연구의 목적은 컨테이너터미널 내부의 차량 통행량을 분산시키면서 차량의 체재시간을 감소시키기 위한 분리게이트 설계방안을 제안하는 것이다. 대량의 컨테이너가 단기간에 하역되기 때문에 많은 차량이 일시에 게이트를 통과해야 한다. 본 연구는 두개의 개별 선석의 통합을 고려한 게이트 운영을 위한 효과적인 설계로서 분리 게인트시스템을 제안한다.

• 유통과학연구
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• 제14권1호
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• pp.29-38
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• 2016

Purpose - The purpose of paper is to review and look into the process of port development of each country, and compare with their system of port management. Research design, data and methodology - The methods to be taken is to examine a process of port development in terms of historic and regulated point of views, and each country's port is compared with various port models. Results - China has evolved of port governance into 3 stages, which has lead to almost liberalized port management system in process of privatization slogan. Japan has three stages of port development, and key commitments have been done by local government, rather than national one. Korea has also several stages of port reforms, and national government has been deeply involved in port industry, as well as regional government and port authority in certain areas. Conclusions - whatever port management system each countries has taken, it eventually aims to port productivity in country's port. To adopt most proper port management system may be answer for country to cope with environmental changes around port industry.

• 한국조경학회지
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• 제33권6호
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• pp.127-139
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• 2006

Mt. Yokmang landscape design awarded first in [North container terminal site furtherance construction in Busan new port], design competition sponsoring in the Korea Container Terminal Authority in 2005. Design guideline was to propose the symbol of new port and to establish landscape plan in consideration of view and geological location. Because landscape plan required establishment of restoration plan for cutting slope, Mt. Yokmang became the major object. The purpose of planning are as follows. The first purpose is to minimize existent natural environment damage, and the second, to connect with ambit and create new image. The third is to provide place of rest and interchange for local resident. Reflecting stratum structure and landscape characteristics, cutting slope consisted of [utilization slope], [presentation slope], [landscape slope], and [ecological slope]. Vegetation design applied ecological restoration method through restoration of stratum, and eve environment-friendly afforestation, planned program that can connect area with existing ecosystem. In process that decides form of the cutting slope, analyze view structure and visual exposure in various access routes, sensitivity etc. was accomplished. Also, symbolic tower(Ocean Polaris) that presents in architecture and landscaping features, night landscape planning could gain synergy effect by keeping consistence with landscape and ecological planning. Passing through final design and construction process, I expect that the Mt. Yokmang will be a new landmark in Busan new port.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1989년도 한국자동제어학술회의논문집; Seoul, Korea; 27-28 Oct. 1989
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• pp.276-281
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• 1989

Comparison 3-port servo system with 4-port is made to obtain optimal design for heavy and unidirectional hydraulic system, It is concluded that 3-port servo system it more adequate than 4-port for the heavy load system which is usually operated at lower frequencies. High performance electro-hydraulic position controller is designed using 3-port servo valve. It includes dynamic pressure feedback as a inner loop and position feedback as a outer loop.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 춘계학술대회 및 창립 30주년 심포지엄(논문집)
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• pp.317-323
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• 2006

본 연구는 초대형컨테이너선 기항에 대비한 차세대 항만하역기술로 고층 장치시스템 개발을 다루고 있다. 고층 장치시스템은 한정된 부지내에서 처리능력을 극대화시킬 수 있는 시스템으로 기존의 컨테이너 터미널이 안고 있는 장치장 부족문제룰 일시에 해결할 수 있으며, 고성능 및 자동화가 가능하여 터미널의 하역생산성을 높일 수 있는 대안으로 평가된다. 이에 본 연구에서는 고층 장치시스템을 적용한 터미널의 설계개념도를 작성해 보았으며 시뮬레이션 기법을 이용하여 고층 장치시스템을 도입한 전용터미널의 하역능력을 분석해 보았다. 연구결과는 차후 실제 터미널 운영을 위한 기본 설계 및 상세설계의 기초자료로 활용될 수 있으며, 본 연구에서 제시하는 고층 장치시스템은 향후 기존 터미널 및 신규 터미널 개발에 적용하여 항만의 부가가치를 더욱 향상시키는 원동력이 될 것으로 본다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 Asia Navigation Conference
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• pp.193-202
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• 2006

Port development is remarkable increased due to the progress of industrialization in ASEAN area. Especially, Vietnam has increased the international physical distribution in this area rapidly. The main issues facing decision makers at container terminals in Vietnam are how to expand the existing container terminals and construct new container terminals. In this paper, we performed the basic design based on simulation analysis in order to support the expansion of Quy Nhon port in Vietnam as a case study. The preliminary capacity analysis was conducted on the one berth at the port to analyze the scale of C/C and yard area. Alternative scenarios were created based on the preliminary capacity analysis and the detailed simulation analysis was conducted fur the scenarios. And in order to establish the marketing strategy, we classified the marketing elements by industrial environment and performed SWAT analysis of the port.