• 대한조선학회논문집
• /
• 제60권5호
• /
• pp.305-319
• /
• 2023

This study focuses on measuring the relative wave elevation around the KSUPRAMAX-O ship and comparing it with numerical analysis results (potential and computational fluid dynamics). The relative wave elevation is a good indicator of the pressure distribution on the ship's surface, which is affected by the ship's motion, incident waves, and distributed waves. Prior to measuring the relative wave elevation, a comparative test was conducted on resistance type, capacitance type, and ultrasonic type wave probe to measure the relative wave elevation, and it was confirmed that the resistance type wave probe was suitable for measuring the relative wave elevation. A model test was performed at low speed and design speed using resistance type wave probe and compared with the results of numerical analysis result. As for the motion response, it was confirmed that the result of experiments and the result of the numerical analysis were in good agreement. The relative wave elevation showed a similar trend between the experiment and the computational fluid dynamics, but the potential analysis result showed a difference from the experiment in design speed.

• 한국산학기술학회논문지
• /
• 제16권11호
• /
• pp.7485-7493
• /
• 2015

한류의 활성화에 따라 한류 관광객을 위한 문화 상품의 중요성이 부각되고 있다. 그러나 현존하는 상품들은 연예인 캐릭터의 생활용품이 주를 이루고 있으며, 실용성이 가미된 의류제품의 문화상품은 현저히 그 수가 적다. 특히 아동복과 관련된 문화상품은 거의 개발되지 않았으며, 소수의 상품은 기본 티셔츠에 그래픽 또는 전통한복이 주를 이루었다. 이러한 상황에서 중국인들의 소비 패턴과 한류 문화상품을 적용시켜 볼 때, 한류 문화 상품으로써의 아동복이 개발 된다면 한류의 활성화 및 국내 패션시장에도 도움이 될 것으로 사료된다. 이에 본 연구에서는 한류 문화상품으로써의 아동복 디자인을 개발하여 실증적인 연구 결과물을 제시하고자 하며 다음의 연구목적을 수행하고자 한다. 첫째, 한류 문화상품의 개념을 파악하고 이들의 현황을 분석하여 현 시점의 한류 문화상품 개발을 위한 데이터를 구축하고자 함이며 둘째, 디자인 개발을 통한 실물작품을 제작하여 한류 문화 상품 시장에 실증적 자료로 제공하고자 함이다. 연구방법 및 내용으로는 선행연구 리뷰 및 질적 연구를 위한 일대일 심층 면접, 시장조사와 작품 개발의 실증적 연구로 진행하였으며, 최종 연구결과물인 4벌의 작품을 통해 소비자 니즈를 만족할 수 있는 한류 문화상품 아동복을 실증적 자료로 제시하였다. 본 연구는 국내 패션 시장 및 문화상품 시장에 기초자료로 활용될 수 있으며 중국 소비자 니즈 분석을 위한 참고자료로 그 의의가 있다.

• International Journal of Naval Architecture and Ocean Engineering
• /
• 제7권1호
• /
• pp.70-86
• /
• 2015

Short crested waves play an important role for planning and design of harbours. In this context a numerical simulation is carried out to evaluate wave tranquility inside a real harbour located in east coast of India. The annual offshore wave climate proximity to harbour site is established using Wave Model (WAM) hindcast wave data. The deep water waves are transformed to harbour front using a Near Shore spectral Wave model (NSW). A directional analysis is carried out to determine the probable incident wave directions towards the harbour. Most critical threshold wave height and wave period is chosen for normal operating conditions using exceedence probability analysis. Irregular random waves from various directions are generated confirming to Pierson Moskowitz spectrum at 20m water depth. Wave incident into inner harbor through harbor entrance is performed using Boussinesq Wave model (BW). Wave disturbance experienced inside the harbour and at various berths are analysed. The paper discusses the progresses took place in short wave modeling and it demonstrates application of wave climate for the evaluation of harbor tranquility using various types of wave models.

• 한국해안·해양공학회논문집
• /
• 제20권4호
• /
• pp.355-362
• /
• 2008

경사식 방파제에서 파랑과 구조물의 상호작용에 의하여 발생되는 처오름을 확률론적으로 해석할 수 있는 Level II AFDA 신뢰성 모형이 제안되었다. Level III MCS 모형을 함께 적용하여 본 연구에서 제안된 모형이 만족스럽게 검증되었다. 또한 목표파괴확률과 각 확률변수들의 통계적 특성 그리고 영향계수를 이용하는 역해석 기법을 적용하여 처오름과 관련된 각 확률변수들의 부분안전계수를 산정할 수 있었다. 특히 Level I 신뢰성 설계법을 쉽게 적용할 수 있도록 처오름의 설계기준식을 현행의 결정론적 설계법과 동일한 형태로 유도하였다. 마지막으로 본 연구에서 제시된 부분안전계수를 이용하여 Level I 신뢰성 설계법으로 재 설계한 결과가 CEM(2006) 및 Level II 신뢰성 설계법의 결과와 만족스럽게 비교되었다.

• 한국해양공학회지
• /
• 제27권1호
• /
• pp.85-92
• /
• 2013

This paper deals with the resonant type of a WEC (wave energy converter) and the determination method of its geometric parameters which were obtained to construct the robust and optimal structure, respectively. In detail, the optimization problem is formulated with the constraints composed of the response surfaces which stand for the resonance period(heave, pitch) and the meta center height of the buoy. Use of a signal-to-noise ratio calculated from normalized multi-objective results with the weight factor can help to select the robust design level. In order to get the sample data set, the motion responses of the power buoy were analyzed using the BEM (boundary element method)-based commercial code. Also, the optimization result is compared with a robust design for a feasibility study. Finally, the power efficiency of the WEC with the optimum design variables is estimated as the captured wave ratio resulting from absorbed power which mainly related to PTO (power take off) damping. It could be said that the resultant of the WEC design is the economical optimal design which satisfy the given constraints.

• 한국해양공학회:학술대회논문집
• /
• 한국해양공학회 2006년 창립20주년기념 정기학술대회 및 국제워크샵
• /
• pp.377-381
• /
• 2006

Recently, as economy grow and population increase we need to develop our coastal area and make good use of it for various purposes. That's why large structures are being installed on the sea. Some samples are petroleum storage tanks, pier of sea bridges. These are large structures which have been installed at coastal area. When we design such vertical cylinder, we should avoid too much construction expense caused by excessive designing or by lack of sufficient design. In order to prevent excessive expenditure, it is important to correctly calculate the force of waves acting on structures and predict the wave transformation. In this study, apply to VOF method based on Navier-Stokes equation and then discussed that nonlinear wave force and wave transformation. A comparison between the numerical model and existing experimental results showed nice agreement among them.

• 디지털산업정보학회논문지
• /
• 제9권1호
• /
• pp.103-110
• /
• 2013

WAVE system is a vehicle communication technology. The system provides the services to prevent vehicle accidents that might occur during driving. Also, it is used to provide various services such as monitoring vehicle management and system failure. In this paper, we divide module that manages WAVE MAC state into a WSMP base MLME module and IP base module and we design and implement a parameter environment between WME module to manage the state of the WAVE system and MLMEX module to mange IP base of WAVE MAC therefore the date to be processed.Also, in order to verify the validity, we have carried out experiments to compare the speed of data processing by dividing data of 5Mbyte, 10Mbyte, 20Mbyte into the packets of 2KByte and 4KByte. Therefore, in WAVE system, the Parameter environments and data processing speed between WME and MLMEX module can be utilized in the various service of vehicle communication technology depending on the speed of data processing.

• 패션비즈니스
• /
• 제17권2호
• /
• pp.151-163
• /
• 2013

In this research, with a goal of lessening the damage to hair by adding rose hip extract to permanent wave 1 solution and performing permanent wave procedure prior to acid dyeing and maximizing the effect of the procedure, rose hip extract 15%, 20% was added to each thioglycolate 1 solution and cysteine 1 solution and the procedure was performed. As a result, when performing the procedure by adding rose hip extract to permanent wave 1 solution thioglycolate and cysteine permanent wave 1 solution, the effect of wave effectiveness is increased and the damage to hair was confirmed to be low. Depending on the rose hip additive status in thioglycolate, the treatment effect of hair was shown to be beneficial. However, the limit of this research is that the thickness of hair strands for each person differs as well as the location of the hair contributing to the difference and therefore exact judgement regarding the shape of waves as well as the level of damage cannot be fully measured. In the following clinical tests, we will test the procedure on variety of hair types.

• 한국해양공학회지
• /
• 제27권6호
• /
• pp.16-21
• /
• 2013

In this paper, the mooring system for a floating wave energy farm is designed based on a two-dimensional analysis. The mooring system uses an anchorless mooring line linking two floaters in a floating wave energy farm. The basic equation to determine the length of the mooring line between the two floaters is proposed. The other properties such as the diameter and pretension are taken from the mooring line for a single floater. The dynamic behavior and safety of the designed mooring system under extreme ocean conditions are analyzed with the commercial software Orcaflex. A numerical study shows the stability and high safety in tension of the designed mooring lines for a floating wave energy farm. The proposed anchorless mooring system for a floating wave energy farm results in a considerable reduction in the length of the mooring line, contributing to the economics of a floating wave energy farm.

• 융합신호처리학회논문지
• /
• 제12권3호
• /
• pp.217-221
• /
• 2011

GaAs 나 InP 기반의 HEMT(High Electron Mobility Transistor)들은 우수한 마이크로파 및 밀리미터파 주파수 특성 및 이에 따른 우수한 저잡음 특성을 가지고 있다. GaAs 기반 MHEMT(Metamorphic HEMT)는 InP 기반의 HEMT에 비해 비용 측면에서 커다란 장점을 가지고 있다. 본 논문에서는 마이크로파 및 밀리미터파 응용 시스템에 필수적인 MHEMT의 RF 특성을 예측 평가하기 위하여 MHEMT의 RF 소신호 특성 회로를 시뮬레이션하고 분석하였다. 본 논문에서의 시뮬레이션을 통한 RF 소신호 주파수 분석은 MHEMT를 이용한 밀리미터파 응용 시스템 설계에 도움을 제공할 수 있을 것으로 기대된다.