• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.25 no.12
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• pp.815-821
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• 2015

Maritime safety has been more critical recently due to the occurrence of shipboard accidents involving prime movers. As such, the propulsion shafting design and construction plays a vital role in the safe operation of the vessel other than focusing on being cost-efficient. Smaller vessels propulsion shafting system normally install high speed four-stroke diesel engine with reduction gear for propulsion efficiency. Due to higher cylinder combustion pressures, flexible couplings are employed to reduce the increased vibratory torque. In this paper, an actual vibration measurement and theoretical analysis was carried out on a propulsion shafting with V18.3L engine installed on small car-ferry and revealed higher torsional vibration. Hence, a rubber-block type flexible coupling was installed to attenuate the transmitted vibratory torque. Considering the flexible coupling application factor, reduction gear stability due to torque variation was analyzed in accordance with IACS(International Association of Classification Societies) M56 and the results are presented herein.

• Research in Community and Public Health Nursing
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• v.10 no.2
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• pp.537-548
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• 1999

The purpose of this study was to analyze the relationship of the participation in decisionmaking and expertise of staff nurses. The population for this study was the registered nurses(N=342) working in Chungnam and Chungbuk. The data were collected from April 26 to May 26, 1999. The survey instrument was Participation in Decision Activities Quesionnaire and Expertise scale developed by Anthony(1995), and Job Expertise scale of Van de Ven and Ferry. The results were as follows: 1) There was a significant difference for identification and design, and selection among the process of participation in decision making. 2) There was a significant difference between the participation in caregiving decisions and condition of work decisions. 3) (1) There was a significant difference among caregiving decisions between the expertise indicators and the variables such as education level. and the experience to told who is an expert. (2) There was a significant difference among condition of work decisions between the expertise indicators and the variables such as career, the spent keeping current per week, and self-rating of expertise.

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2002.05a
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• pp.57-61
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• 2002

최근 들어 인터넷과 관련한 정보통신기술의 발전은 모든 산업환경을 변화시키고 있고, 조선 산업에서도 설계 생산성을 향상시키기 위해서 새로운 설계 패러다임을 선박설계 과정에 적용하고 있다. 현재 차도선을 설계하는 설계사무소의 경우 전문 설계인력이 부족함과 동시에 설계 과정은 동일한 작업이 반복적으로 수작업을 통해 이루어지고 있는 상태이다. 이러한 수작업의 반복은 설계 과장에서 에러를 발생시키고 각 설계 단계별로 발생하는 설계 데이터의 에러로 인해 설계생산성을 저하시키는 요인으로 작용될 수 있다. 따라서 본 시스템 개발은 초기설계 과정을 전산프로그램화 하여 초기설계 단계에서의 설계정보 데이터의 정확성을 높여 설계생산성을 향상시키고 또한 이 프로그램을 인터넷 기반으로 제공하여 분산된 환경에서도 다른 설계 전문가들이 함께 참여 할 수 있게 해 설계 정보를 동시에 공유하여 원격지에서도 설계자가 원하는 자료를 검색할 수 있도록 하는데 목적이 있다. 본 연구는 인터넷 기반을 통한 차도선의 초기설계 프로그램의 핵심을 이루는 인터넷 기반 구현 방법에 대해 소개하고 특히 인터넷 환경에서 차도선의 초기설계 프로그램을 통해 설계정보의 교환 및 공유를 원활하게 구현하는 시스템을 개발하는데 있다.

• Journal of the Korean Institute of Rural Architecture
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• v.20 no.1
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• pp.85-92
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• 2018

Although Jeju is the best cruise Secondary port in Northeast Asia, currently there are no dedicated cruise terminals. The port international passenger terminal opened in 2015 has a ferry terminal for offshore passengers and a cruise passenger function. Jeju Island is therefore constructing a cruise only terminal with the aim of opening in 2018 to meet the growing passenger demand at the Seoguipo civilian and public ports along with construction of a naval base at Gangjeong Port in Seogwipo City. It also plans to build cruise docks and cruise terminals in the Jeju New Port according to the Jeju port construction basic plan. However, during the construction and planning process of cruise terminals in Jeju, the adequacy of the terminal size is being debated and the immigration facilities are being operated. Therefore, the study analyzed the size of terminals and operation of immigration facilities appropriate for cruise passenger demand by investigating the status of cruise related facilities and operation in Jeju area. Based on this, the Commission hopes to explore the rational direction of the cruise terminal plan to revive the cruise industry in Jeju and provide high quality service to cruise passengers.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.81-84
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• 2016

Mombasa is the principle port of Kenya, serving hinter countries in Eastern and central Africa. Mombasa port has undergone a massive infrastructure upgrade and dredging works with an expectation that more vessels and large post Panamax ships will be able to call at Mombasa port. Therefore, it is vital to carry out a marine traffic risk assessment so as to quantify the degree of navigation safety on Mombasa approach channel and also to evaluate navigation risk imposed on transit traffic by local ferry traffic. In this paper marine traffic risk assessment is carried out using IWRAP mk2, Environmental Stress model, and PARK model. Risk assessment results show that Likoni area has unacceptable stress/ risk ranking at 20.7% on ES model and 38.89% by PARK model. IWRAP mk2 model shows that crossing area has the highest risk of crossing collision and the area at the entrance to inner channel has a high risk of grounding. The conclusions derived from this study will provide the basis for proposing the most effective countermeasure so as to improve navigation safety in Mombasa approach channel.

• Journal of Navigation and Port Research
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• v.35 no.1
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• pp.1-7
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• 2011

This paper describes the development of Data Acquisition System (DAS) to obtain the vessel and weather information needing to evaluate collision risks levels between Mokpo harbor bridge and passing vessels. DAS consists of Signal Receiving and Processing Unit to obtain the data sets of passing vessels and weather status, Networking Unit to transmit and distribute the acquisition data sets and Data Management Unit. Through the field tests on the deck of shuttle car ferry between Mokpo Port Passenger Terminal and An-Jua island, Sinan-Gun, we found that the DAS can provide useful data sets for adequate the collision risk evaluation. In addition, the noise-like data sets appeared in the weather data can be suppressed fully using 5-th order Butterworth digital filter.

• Proceedings of the KSRS Conference
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• 2006.03a
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• pp.87-90
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• 2006

인천-제주 정기여객선에 수온, 클로로필 및 탁도계 등의 센서를 설치하여 해양환경 모니터링 시스템을 구축하였으며, 여객선 항로를 따라 2001년부터 2004년까지 18회에 걸쳐 자동관측과 함께 20-30분 간격으로 30여개의 정점에서 해수를 채수하여 분석하였다. 연구의 목적은 채수된 해수를 직접 분석하여 여객선에 설치된 자동측정 센서가 신뢰성 있는 자료를 생산하는지 비교 분석하는 것과 서해 한반도 연안의 해수특성을 전체적으로 이해함으로서 계절적인 변동을 파악하는 것이다. 2001-2003년 초까지 사용된 YSI 센서는 수온, 염분, 탁도와 클로로필 농도 등을 종합적으로 측정할 수 있는 멀티센서이나, 설치하여 운용해 본 결과 정밀도에서 많은 문제점이 발생하였다. 따라서 2004년 이후 클로로필과 탁도 자동 측정을 위한 단일 센서들로 교체되었으며 이들 센서는 멀티센서 보다 좋은 결과를 보였다. 비록 자동측정 장치에 문제는 있었으나, 18회에 걸친 서해 연안의 실시간 모니터링을 통하여 해수환경의 계절별 특성을 이해할 수 있었다. 부유퇴적물의 경우, 경기만과 목포 주변의 남쪽 해안은 농도가 모든 계절에서 높게 나타났으며 특히 가을 겨울철에 가장 높은 값을 나타냈다. 클로로필의 농도도 경기만 중심지역과 남쪽 해안에서 여름과 가을철에 걸쳐 0.4 - 6.0 $mg/m^3$ 정도의 분포를 보였으나 겨울철에는 2.6 $mg/m^3$ 미만으로 나타났다.

• Steel and Composite Structures
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• v.13 no.1
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• pp.71-89
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• 2012

The paper investigates beam lateral buckling stability according to linear and non-linear models. Closed form solutions for single-symmetric cross sections are first derived according to a non-linear model considering flexural-torsional coupling and pre-buckling deformation effects. The closed form solutions are compared to a beam finite element developed in large torsion. Effects of pre-buckling deflection and gradient moment on beam stability are not well known in the literature. The strength of singly symmetric I-beams under gradient moments is particularly investigated. Beams with T and I cross-sections are considered in the study. It is concluded that pre-buckling deflections effects are important for I-section with large flanges and analytical solutions are possible. For beams with T-sections, lateral buckling resistance depends not only on pre-buckling deflection but also on cross section shape, load distribution and buckling modes. Effects of pre-buckling deflections are important only when the largest flange is under compressive stresses and positive gradient moments. For negative gradient moments, all available solutions fail and overestimate the beam strength. Numerical solutions are more powerful. Other load cases are investigated as the stability of continuous beams. Under arbitrary loads, all available solutions fail, and recourse to finite element simulation is more efficient.

• Journal of the Korean Institute of Landscape Architecture
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• v.29 no.5
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• pp.60-70
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• 2001

This landscape design proposal was presented to a design competition for Gwangjin-gu Community Center and Assembly Hall. The site is located in 227-7 Jayang-dong, Gwangjin-gu, Seoul and is part a block designated as \`Kunkuk University Detailed Planning District\`. The judging criteria for landscape design set by the Gwangjin-gu could be articulated as follows: an identity of Gwangjin-gu, a relationship with surrounding environment, a locale as a community center of Gwangjin-gu, and an environment-friendly design. An identity of Gwangjin-gu was expressed by introducing lends and decks around the building which were transformed from the image of the old Gwangjin Ferry. The concept\` was strengthened by \`Nori-madang\` or Korean version of \`plaza\` which was designed by a motive of \`mungsuk\` or Korean old fashioned straw mat. An ambiguous relationship between the site and the surroundings was set by \`transparent exhibition frame\` which not only bleaks the massive Chungdam-daegyo, an elevated road, and frames it into small parts, but also attracts pedestrians toward the site-the \`park\`. Pedestrians from the adjacent\` Nengdong-ro Walkable Streets\` views the site through the many parts of frames. By introducing diverse resting and dynamic spaces for many kinds of cultural activities the site could function as a locale of the Gwangjin-gu community. The main paving system reflects the environment- friendly design. It was detailed by \`PC-block-deck-paving\` which was elevated from the ground so that rains could be absorbed.

• Journal of Agricultural Extension & Community Development
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• v.19 no.1
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• pp.129-145
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• 2012

There are many positioning studies utilizing Analytic Hierarchy Process (AHP) in tourism industry. In this study, it was tried to develop new evaluation criteria for positioning and to discuss the importance of evaluation factors, as the development of tourist's spots was pursued in diversified ways. The purpose of this study was to allow the development of tourist spots more objectively and more efficiently utilizing Analytic Hierarchy Process ("AHP" hereunder) to appoint the best place for the tourism complex in Buyeo. According to AHP analysis procedures, 5 places near Baikje Cultural Block connecting with a ferry in Buyeo-gun were selected as candidates. To perform AHP analysis, evaluation criteria and a survey were used and then weight of evaluation criteria was induced. With the conditions on criteria, standard score of each criterion and candidate was calculated. By multiplying standard score and final weight and then summing up, the candidate place with the highest score shall be appointed as the most optimal place for Buyeo-gun Agricultural Tourism Complex.