• 한국항만학회지
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• 제15권1호
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• pp.47-56
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• 2001

A numerical model for practical use based on the 1-line theory is presented to simulate shoreline changes due to construction of offshore structures. The shoreline change model calculates the longshore sediment transport rate using breaking waves. Before the shoreline change model execution, a wave model, adopting the modified Boussinesq equation including the breaking parameters and bottom friction term, was used to provide the longshore distribution of the breaking waves. The contents of present model are outlined first. Then to examine the characteristics of this model, the effects of the parameters contained in this model are clarified through the calculations of shoreline changes for simple cases. Finally, as the guides for practical application of this model, several comments are made on the parameters used in the model, such as transport parameter, average beach slope, breaking height variation alongshore, depth of closure, etc. with the presentation of typical examples of 3-dimensional movable bed experimental results for application of this model. Here, beach change behind the offshore structures is represented by the movement of the shoreline position. Analysis gives that the transport parameters should be taken as site specific parameters in terms of time scale for the shoreline change and adjusted to achieve the best agreement between the calculated and the observed near the structures.

• 융합정보논문지
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• 제9권3호
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• pp.82-89
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• 2019

대학에서 NCS 교육을 실시하는 이유는 실무 중심의 교육을 통해 학생들의 능력이 향상되고 취업과 실무에서 직무능력의 경쟁력이 강화되면서 긍정적인 효과를 보일 것으로 기대하기 때문이다. 본 연구의 목적은 NCS의 역할과 필요성을 살펴보고 교육전이 및 산업현장에서 실무성과가 나타나는지를 분석하는데 있다. 이를 위해 연구 모형을 "NCS 교육 ${\Rightarrow}$ 교육전이 ${\Rightarrow}$ 실무성과"로 구성하여 수도권에 있는 대학생 400여명을 대상으로 설문조사를 실시하였다. 만일 NCS 교육이 취업과 실무에 필요하다면 대학을 비롯한 교육기관에서는 NCS 교육이 효율적으로 운영되기 위한 방안을 마련해야 한다. 분석 결과 내적 일관성이 확보되었으며 타당성 검증에서 집중타당성과 판별타당성이 모두 확보된 것으로 조사되었다. 구조방정식 모델을 이용한 결과 본 연구모형이 적합한 것으로 나타났으며 가설검증결과 연구가설의 표준화계수가 적정 수준 이상으로 나타나 상호 연관성이 높게 형성되어 있는 것으로 분석되었다.

• 대한조선학회논문집
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• 제46권6호
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• pp.569-577
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• 2009

As the scale factor of model propellers utilized in cavitation test is about 40, it is difficult to find out practical countermeasures against the small area erosions on the blade tip region throughout model erosion tests. In this study, a partial propeller blade model was used for the observation of cavitation pattern for the eroded propeller. A partial propeller blade model was manufactured from 0.7R to tip with expanded profile and with adjustable device of angle of attack. Reynold's number of a partial propeller blade model is 7 times larger than that of a model propeller. Also, anti-singing edge and application of countermeasures to partial propeller blade model which produced in large scale can be more practical than a model propeller. For the observation of cavitation at high Reynold's number, high speed cavitation tunnel was used. To find out the most severe erosive blade position during a revolution, cavitation observation tests were carried out at 5 blade angle positions.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 춘계학술대회 특별세미나. 특별세션
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• pp.34-45
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• 2006

Making practical use of urban MAGLEV system which is tried by government includes technique development and railway construction. Because huge amount of money will be spent on this project, feasibility study is being carried out in order to check the feasibility and to devise the master plan in prior to making practical use of urban MAGLEV system. The key issues of feasibility study are possibility of technique development, economical feasibility, location of a model railway and the improvement of related laws and regulations. This paper shows the approach to solve these key issues.

• 디지털융복합연구
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• 제6권2호
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• pp.87-95
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• 2008

Information technology is rapidly diffused throughout the world. Unfortunately, as the technology goes on the disabled vocational rehabilitation is more isolated in physically and mentally. A new paradigm, 'Digital practical use Opportunity' is a product of the tremendous technological changes driving the disabled vocational rehabilitation. The employment for the disabled vocational rehabilitation is a hot issue. Because lack of education rehabilitation cause many problems for the employer. Relating program of employment and education for the disabled vocational rehabilitation, they can get a job in a better condition. This study propose a model of good environmental employment for the disabled vocational providing them the way of getting a job so that they can go as a member of highly developed society. It conducted in society could fundamentally advance our knowledge about the structure of the employment of the disabled vocational rehabilitation, cure their feelings, give them a chance to live happier, stronger, healthier.

• 실천공학교육논문지
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• 제7권1호
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• pp.11-16
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• 2015

모든 학습자는 다년간의 전공 및 교양 수업을 통하여 많은 지식을 습득하게 된다. 그러나 다양한 과목을 접목시킨 융합적인 공학적 문제 해결은 어려운 경우가 많다. 따라서 본 논문에서는 다양한 교과목을 접목하여 온도 감소효과를 극대화 시키는 히트싱크의 최적화 문제를 예를 들어 실천공학교육적 문제해결 모델을 제시한다.

• Journal of Electrical Engineering and Technology
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• 제9권6호
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• pp.1900-1908
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• 2014

This paper establishes a compact and practical model for a water-wall system comprising supercritical once-through boilers, which can be used for automatic control or simple analysis of the entire boiler-turbine system. Input and output variables of the water-wall system are defined, and balance equations are applied using a lumped parameter method. For practical purposes, the dynamic equations are developed with respect to pressure and temperature instead of density and internal energy. A comparison with results obtained using APESS, a practical thermal power plant simulator developed by Doosan Heavy Industries and Construction, is presented with respect to steady state and transient responses.

• 한국디지털건축인테리어학회논문집
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• 제6권2호
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• pp.31-38
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• 2006

An architect for Cultural Technology have the most obligation to improve the cultural inheritance into an industrial resources. From an esthetical point of view, it is possible to put digital contents to a multiplicity of practical usage in the moment of its' digital conversion. These are practical resources out of an only duplication from the original. Developing cultural archetype into the most suitable model for one-source multi-use that is the core of the project. If you want to change an archetype, a Korean traditional architecture, into a creative source, you should develope a reappearance and a practical model harmonized with the image set. In addition, development process of cultural archetype digital contents based on ultimate idea and imagnation in our architectural culture, referred from cultural archetype and digital contents technology was offered by the study.

• 대한조선학회지
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• 제21권3호
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• pp.1-10
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• 1984

The computer programs of effective horsepower estimation of small fishing boat were developed, which was based on the statistical analysis of model test results. From the EHP estimation by these program and experimental model tests of practical fishing boats, the estimation accuracy was verified with maximum deviation of about 10 percent. Also, the EHP estimation accuracy was practically applied to initial design of four small fishing boats, and after the tank tests, the EHP reduction of the order of 15 to 25 percent was confirmed, as compared with existing ships. Moreover, a computer aided design procedure of fishing boat's hull form has been proposed in this study. The practical use of this procedure of fishing boat's hull form has been proposed in this study. The practical use of this procedure was demonstrated with the hull form design results of several fishing boats.

• 전기학회논문지
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• 제61권5호
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• pp.721-725
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• 2012

In this paper, a novel analysis on the nonlinear response of a power amplifier (PA) with the intermodulation distortion (IMD) asymmetry is proposed based on the mutislice behavioral model. The coefficients of the odd-order and even-order polynomial of that model are represented with the PA practical circuit parameters such as intercept points, gain and amplitudes of excitation inputs. We also develop the analytic expressions to distinguish baseband frequency effect from second harmonic effect on the IMD asymmetry. We also validate the derived analytic expressions through measurements.