• Journal of Advanced Marine Engineering and Technology
• /
• 제41권4호
• /
• pp.316-322
• /
• 2017

본 논문의 주 목적은 수치해석 도구를 활용하여 저항성능 관점에서 우수한 선형을 개발하는 것이다. 최종 개발된 선형의 성능 평가를 위해 수조 모형시험을 수행하였다. 현존선은 도면을 바탕으로 실물과 도면의 타당성 검토를 위해 실태조사를 수행하였다. 실태조사 시에 실제 운항 상태인 주 운항 배수량 및 주 운항 선속을 확인하였다. 수치해석을 바탕으로 현존선의 저항성능을 검토하였다. 개발선은 선수어깨의 파형개선, 배수량 분포의 균형화, 단면형상의 수정 그리고 중앙 스케그의 크기와 형상 변경에 관한 스터디를 통해 도출되었다. 수치해석 결과 개발선은 조파저항 개선에 의해 저항성능 관점에서 주 운항 선속인 11노트에서 약 15% 개선된 양을 보여주었다(Table 4 참조). 개발된 선형의 성능 평가를 위해서 수조 모형시험을 수행하였으며 그 결과 11노트에서 약 17% 개선된 양을 보여주었다(Table 5 참조).

• 한국항해학회지
• /
• 제16권3호
• /
• pp.33-41
• /
• 1992

Handling performance of a vessel is greatly related with her steering characteristics which consist of two kinds of motion characteristics ; namely course stability and turning ability. The correct prediction of the qualities, especially the steering characteristics is as much important in ship handling as in ship design. It is the purpose of this paper to provide ships handlers better understanding of steering characteristics and then to help them in safe controlling and maneuvering of vessels presenting distinct inherent steering characteristic difference that lies between a fine-form vessel and full-form vessel. The authors calculated dynamic course stabilities of two kinds of ideal models, one of which represents a fine-form ship and the other a full-form ship, based on hydrodynamic data of forces and moments obtained by model tests in maneuvering tanks. The result of calculations indicated that a ship of full-form configuration has inhernet course instability. Though significant nonlinearties affect ship montions in maneuvers, application of linear theory is sufficient for prediction of the maneuvering characteristics of vessels on calm waters for handling reference.

• 대한조선학회논문집
• /
• 제47권3호
• /
• pp.469-475
• /
• 2010

The operation scenarios, types of ice, draft and propulsion system are important design point on the beginning stage of the ice breaking vessel. The concept of hull form in ice breaking vessel has to compromise the performance according to the operation route especially if ship is operating in ice and ice free water. The several hull forms were proposed to optimize the capability of the vessel in this paper. The effect of hull form according to type of ice is also discussing and explaining the ice resistance in each ice type as like pack ice, brash ice, level ice, rubble ice and ice ridge. The draft effect was examined and propulsion system for example FPP(Fixed pitch propeller), CPP(Controllable pitch propeller) and POD system was compared focusing on the propulsion efficiency.

• 한국해양공학회:학술대회논문집
• /
• 한국해양공학회 2000년도 추계학술대회 논문집
• /
• pp.261-264
• /
• 2000

Two hull forms of 2, 500 TEU Container Vessel, designed by Daedong Shipbuilding CO., LTD. were tested at the Circulating Water Channel of Chosun University for the evaluation of resistance performance. The test results of resistance, wave profile measurement and trim-sinkage measurement are compared in the form of diagrams and figures, and the results are discussed. A conclusion is drawn that the performance of modified form (model number : CU-201F2A2) is improved about 8% resistance performance at the design speed compare with original form (model number : CU-201F1A1).

• International Journal of Naval Architecture and Ocean Engineering
• /
• 제6권2호
• /
• pp.496-506
• /
• 2014

In this paper the scenario based optimization of the bulbous bow of the KRISO Container Ship (KCS) is presented. The optimization of the parametrically modeled vessel is based on a statistically developed operational profile generated from noon-to-noon reports of a comparable 3600 TEU container vessel and specific development functions representing the growth of global economy during the vessels service time. In order to consider uncertainties, statistical fluctuations are added. An analysis of these data lead to a number of most probable upcoming operating conditions (OC) the vessel will stay in the future. According to their respective likeliness an objective function for the evaluation of the optimal design variant of the vessel is derived and implemented within the parametrical optimization workbench FRIENDSHIP Framework. In the following this evaluation is done with respect to vessel's calculated effective power based on the usage of potential flow code. The evaluation shows, that the usage of scenarios within the optimization process has a strong influence on the hull form.

• 한국해양공학회지
• /
• 제11권3호
• /
• pp.89-94
• /
• 1997

In the design of high speed fishing vessel, its hull form has to be decided from a view point of resistance and propulsion performance without negelction of seakeeping characteristics. In spite of many efforts, the performance improvement by hull form itself has its limitations, specially for high speed craft. In this paper, the development of performance of resistance and seakeeping improving appendage for high speed planing hull on behalft of the hull form of fishing vessel has been introduced. The developed appendage verified its effectiveness in the full scale test.

• 대한족부족관절학회지
• /
• 제6권1호
• /
• pp.80-85
• /
• 2002

Purpose: This study is to assess the involvement of vessels in lower extremity in diabetics, using color doppler ultrasonogram. Materials and Methods: Arteries of both lower extremities were divided into 3 groups-large vessel (above-knee arteries), popliteal vessel, and small vessel(below-knee arteries) -, and evaluated using color doppler ultrasonogram in 60 diabetics. In color doppler ultrasonogram, the wave forms of all vessels were divided into 5 grades; grade I was triphasic wave form, grade II was spectral broadening form, grade III was monophasic wave form, grade IV was pulsus tardus et parvus form, grade V was absence of wave. Grade III, IV, V were grouped into vessel obstruction. We reviewed the correlationships among the degree of the peripheral vascular involvement, duration of dibetes, existence of bilaterality, types of dibetes. Results: Bilateral involvement was high in both lower extremity. Luminal stenosis, vascular calcification and vessel obstruction were high incidence in the patients over ten years of diabetic duration. Prevalence of vascular calcification and vessel obstruction were high in the small vessel of ankle level. But, insulin injection was not related to the incidence of vascular abnormality. Conclusion: Color doppler ultrasonogram seems to be useful for evaluation of peripheral vascular status, decision making for necessity of additional test, periodic follow -up tool in diabetes patients.

• 대한조선학회 특별논문집
• /
• 대한조선학회 2005년도 특별논문집
• /
• pp.57-62
• /
• 2005

STX shipbuilding Co,. Ltd. has been developed a hull form and propeller of medium class container vessel. The present paper deals with numerical calculations and experimental tests for the investigation of wave resistance, viscous resistance and propeller. The characteristics of wave resistance and self propulsion factors are varied in order to find an optimized hull form. The measured results have been compared with computed results by 'WAVIS' The prediction of the caviation occurrence was predicted by 'Opti-pro' and measurement is performed in KRISO.

• 한국해양공학회:학술대회논문집
• /
• 한국해양공학회 2001년도 춘계학술대회 논문집
• /
• pp.53-59
• /
• 2001

In this Paper, the resistance performances of twin hull forms, which are simplified as two-dimensional wedge shape, are experimentally investigated in low and middle speed ranges to find out the effect of distance between two hulls and fore-body shape for the future hull form development of catamaran type sweeping vessel. The model tests are performed for seven different cases for three models in the circulating water channel(CWC) of Inha Technical College. The free surface flows are observed together to investigate the relation between resistance performance and free surface characteristics. A conceptual design for the modification of bow hull form is presented and the efficiency is discussed.

• 디자인학연구
• /
• 제14권
• /
• pp.233-243
• /
• 1996

Our Country are called as a suzerain State of fermentation food, and preservative Technique was developed, because the specific character and the form of pottery were the best superior utensil of storage. The form couldn't give an explanation with scientifically, but we have used it for a few thousand years, which must get transformed from most compatible and reasonable form of fermentation. At present, a pottery was disappeared by the growth of the industrial society, and even the scientific form concealed it looks. For that reason, we apply the form into looks of a modernistic mechanism, and it intends to suggest a new direction to better the pottery of a formentation food.