• 한국항해항만학회지
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• 제40권5호
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• pp.291-297
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• 2016

Ulsan Port is the main port for handling liquid cargo because of natural environmental conditions and the distribution of port infrastructures in Korea. Damage to both liquid cargo vessels and the port structure caused by maritime accidents could have a serious impact on property and human lives as well as the marine environment. For safe navigation, the parties concerned should ensure the suitability of various design criteria at the harbor design stage. In this paper we analyze and compare various domestic and international harbor design criteria, and then apply each criteria to Ulsan port to evaluate its overall safety. Additionally, this paper specifies certain precautions in terms of reviewing a ship's safety for each channel at Ulsan Port, and suggests possible improvements to optimize channel design.

• 해양환경안전학회지
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• 제30권2호
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• pp.184-193
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• 2024

항만 및 및 어항 설계기준에서는 항로의 설정 시 선박의 안전 항행을 보장하고 조선이 용이하도록 설계되어야 한다고 정의하고 있다. 그중 항로 폭 설정은 항로를 설정함에서 중요한 조건 중 하나이다. 그러나 우리나라 항로 폭 설정 기준은 국외의 정량적 평가기준과 비교하여 정성적 평가 기준에 비중이 있다. 선박이 항주 중에 받는 저항에 직·간접적으로 영향을 미치는 것이 바람, 조류, 파랑 등의 자연환경 요소이다. 자연환경 요소의 크기에 따라 항주 중인 선박에 미치는 영향이 안전 운항에 위협이 되기도 한다. 이를 방증하듯 우리나라에서는 자연환경 여건에 따라 선박 출항 통제를 규정하고 있다. 이처럼 선박 안전 운항에 밀접한 관계가 있는 자연 환경적 요인을 반영하기 위해 국외의 항로 설계지침에서는 자연환경 요소들의 정량적 평가 기준을 제시하여 항로 폭 설계 시 반영하고 있지만 우리나라는 외력을 고려한 구체적인 평가 기준이 마련되어 있지 않은 실정이다. 본 연구에서는 목포항 입·출항 선박들의 항적을 기초 자료로 활용하여 실제 선박들이 운항하면서 사용한 항로 폭과 자연환경 요소와의 관계를 분석하고 이를 바탕으로 조류 크기에 따른 필요 항로 폭을 제시하고 국외의 항로 설계지침과 비교하였다.

• 해양환경안전학회지
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• 제5권2호
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• pp.79-86
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• 1999

This study aims at improving the channel of Pudo-sudo in Chinhae-Man according to the development project of the port of Masan, by investigating the design criteria of harbour facilities for the maximum sized ship. The new deep-water route was proposed and according to it the present separation scheme was adjusted appropriately. The width of the deep-water route is suggested to be 350m and would be wide enough for the 30,000 DWT container ship to go through However, the proposed channel will be tested and validated by the shiphandling simulator.

• 한국의류산업학회지
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• 제12권3호
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• pp.318-326
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• 2010

The advantages of the multi-channel retailing have been widely discussed but empirical research on fashion multi-channel retailing has been limited. In this study, multi-channel concept was discussed and then, channel choosing condition of apparel shopper and channel choosing criteria for information search and buying were investigated as a empirical study. Drawing on a sample of 298 customers of apparel products in Korea, the result demonstrated that some differences in the perception of experience goods and search goods among apparel products. And, according to buying channel, consumers were different from each other in information search time and clothing expenses. Some suggestion for the future research of multi-channel retailing was given.

• Journal of Mechanical Science and Technology
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• 제15권7호
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• pp.941-950
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• 2001

A study of counter-current two-phase flow in narrow rectangular channels has been performed. Two-phase flow regimes were experimentally investigated in a 760mm long and 100mm wide test section with 2.0 and 5.0mm gap widths. The resulting flow regime maps were compared with the existing transition criteria. The experimental data and the transition criteria of the models showed relatively good agreement. However, the discrepancies between the experimental data and the model predictions of the flow regime transition become pronounced as the gap width increased. As the gap width increased the transition gas superficial velocities increased. The critical void fraction for the bubbly-to-slug transition was observed to be about 0.25. The two-phase distribution parameter for the slug flow was larger for the narrower channel. The uncertainties in the distribution parameter could lead to a disagreement in slug-to-churn transition between the experimental findings and the transition criteria. For the transition from churn to annular flow the effect of liquid superficial velocity was found to be insignificant.

• 한국농공학회논문집
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• 제64권5호
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• pp.17-26
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• 2022

In this study, in order to establish the criteria for evaluation of importance by the type of facility specialized for agricultural reservoirs, an expert group consisting of a total of 167 members who were in management, or specialized in the fields of design, research, and diagnosis were organized, and the importance for facilities was set with application of the AHP technique. The importance of dam body, spillway, and intake structure composing a reservoir were set at 59%, 24%, and 17%, and the importance of dam crest, upstream slope, and downstream slope constituting a dam body was set at 32%, 31%, and 37%, respectively. In addition, the importance of approach channel, regulated channel, chute channel, and stilling basin consisting a spillway was set at 15%, 44%, 26%, and 15%, and the importance of inclined conduit and outlet conduit consisting an intake structure was set at 35% and 65%, respectively. The safety grade of the reservoirs evaluated by applying the newly presented importance values in this study showed the rearrangement of the grades with a change of 11% compared to the previous grades. In this way, the newly established criteria are expected to be utilized as basic data with strategic importance in reservoir safety management and disaster prevention as well as the operation of systems in the future.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -1
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• pp.421-424
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• 2002

In this paper, we introduce an encoder design technique of multiple symbol trellis coded modulation for noncoherent continuous phase frequency shift keying (MTCM/NCPFSK) on the interleaved Rician fading channel. To find dominant factors which affects the error probability of MTCM/NCPFSK, we derive the pairwise error probability (PEP) of MTCM/NCPFSK and find that the error probability mainly depends on the effective length of error event and the corresponding squared product distance (SPD) for the small value of Rician parameter K. Using this performance criteria, we search for the optimal encoder of MTCM/NCPFSK for the interleaved Rician fading channel. We also compare that encoder with the encoder designed for additive white Gaussian noise channel.

• 한국수자원학회논문집
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• 제53권1호
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• pp.29-43
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• 2020

본 연구의 목적은 하천복원에 스텝-풀 연속체를 적용하기 위해 기존 연구결과에서 스텝-풀의 기하구조, 형성 과정, 수리 기능, 복원 및 생태 기능과 관련된 사항을 검토하여 설계기준 및 세부설계 모델을 제시하는 것이다. 분석 및 검토결과를 바탕으로 스텝 간격과 하폭의 비, 단위스텝경사와 하상경사의 비, 및 스텝 높이와 입경 비로서 스텝-풀의 구조 및 규모에 대한 설계기준을 제시하였고, 스텝의 구조적 안정성 확보를 위해서는 키스톤 이론을 근거로 전도에 대한 안정성 해석방법을 설계기준으로 제시하였다. 세부설계 개념으로서 스텝-풀의 평면, 종단 및 횡단 구성에 키스톤과 아치스톤에 대한 겹침구조를 적용한 배치 모델을 제안하였다.

• 한국방재학회 논문집
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• 제7권1호통권24호
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• pp.47-56
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• 2007

본 연구는 금강유역내 중규모 하천을 대상으로 계획홍수량, 유역면적, 유로연장, 하상경사 등 유역의 수리 수문학적 특성 인자를 매개변수로 하여 계획하폭 결정식을 제안하였다. 유도한 계획하폭 산정식은 다중 회귀분석에 의한 결정계수 등의 비교에서 기존에 사용하고 있는 중부지방 경험식, 하천설계기준에 비해 우수한 결과를 나타냈다. 이들 결과를 다른 자료군의 금강수계 동일규모 유역을 대상으로 검증한 결과는 계획홍수량, 유역면적, 유로연장, 하상경사의 4개 매개변수로 유도한 관계식이 가장 우수한 것으로 나타났다. 본 연구에서 유도한 관계식을 수공실무의 계획 하폭산정에 적용한다면 현재 사용하고 있는 경험식보다 좋은 결과를 얻을 수 있을 것이다.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2004년도 추계학술발표회 발표논문집
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• pp.979-980
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• 2004

A multi-channel mechanical test machine for HANARO was designed and fabricated based on the design criteria of the multi-channel mechanical test machine sustained at the working conditions of $<400{\square}$, 3 W/g of gamma heating rate, $5{\times}10^{20}\;n/cm^2$, neutron flux and maximum load of 200 MPa. The multi-channel mechanical test machine made of 304 stainless steel consisted of four modules. Two of them locate upper part of the machine and the others locate lower part with 90 degree rotation. Each module was evaluated by determine load-displacement curve of zirconium specimen. Thermal insulators were also made by electron spark-machining of pure aluminum which was prepared in a domestic company.