• Journal of Advanced Marine Engineering and Technology
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• 제26권5호
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• pp.589-595
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• 2002

Fluid mixing is ubiquitous and essential in many natural and industrial systems. Understanding the mixing processes that occur in these diverse systems is essential for predicting many aspects of practical importance. The objective of this study was to develop a new mixing element and to perform the experimental investigation of flow and mixing in a static mixer that is equipped the new element and the others. Glycerin and gear oil were used as mixing fluids. Pressure drops across the static mixer elements of different designs and different numbers were measured using a hydraulic manometer The axial and cross-sectional views of tracer mixing were photographed using a digital camera. The pressure drops of SSM mixer were about 20% less than that of Sulzer mixer whereas the mixing performance of SSM mixer was not so good as that of Sulzer mixer

• 한국문헌정보학회지
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• 제45권2호
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• pp.5-21
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• 2011

There is an explosion of talk about crucial, new literacies for the 21st Century, for example critical thinking, problem-solving, media literacy, technology literacy, digital literacy, visual literacy. The other day, there was even an article about "gaming literacy!" How does one make sense of it all? The common factor in all these literacies is "information" - information seeking, information use, information processing, information presentation, and information evaluation. And, these "information" elements come together in information literacy: the ability to engage in effective and efficient information problem-solving. Information literacy is the overarching and unifying literacy, and all libraries have a unique and essential role to play in delivering meaningful information literacy programs to people of all ages. In this keynote paper and address, Professor and Dean Emeritus Mike Eisenberg will define the concept and structure of library-based information literacy programs and offer strategies for developing and implementing information literacy programs that are comprehensive(reaching all users), predictable (consistent over time), and accountable(measured and reported).

• International Journal of Railway
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• 제5권4호
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• pp.152-155
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• 2012

The essential element of brake device for railway vehicle is in demand for higher performance along side the trend of railway vehicle size and speed. Essential element of brake device for high speed train is composed of metallic friction material and brake disc. Thus, brake distance, duration and brake stability shall be determined due to friction materials and friction characteristics. Also friction characteristics are influenced by metallic friction material's properties of matter, manufacturing process and component parts. Various materials and configurations of metallic friction materials are currently being implemented to railway vehicles, For this reason study of friction characteristics in accordance with materials is necessary, but study of these important elements are not actively being accomplished. Therefore, in this study, wished to study the graphite's friction characteristic comprised in friction material in accordance with particle size and amount of volume through lab-scale test.

• Journal of Yeungnam Medical Science
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• 제37권2호
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• pp.79-83
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• 2020

In the 21st-century postmodernism era, which represents diversity and relativity, one of the most essential elements in the field of education is to strengthen individual human values. Accordingly, we must focus on developing capacity in order to adapt to change. It is clear that the medical field maximizes the need for new judgments to solve life-related problems constantly, and this problem-solving capacity is an essential skill for a physician. Problem-solving capacity can be achieved simultaneously with creativity to apply them in an appropriate manner based on standardized expertise and well-trained skills. Creativity is also a key element that medical education is currently pursuing. Many studies on creativity have resulted in confusion and misunderstandings on the concept of creativity due to similar terms and varied definitions, such as creation, innovation, etc. In this study, we attempt to identify the importance of creativity in medical education by comparing and organizing concepts related to creative capacity.

• 한국지진공학회논문집
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• 제23권1호
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• pp.83-88
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• 2019

Structural analysis remains as an essential part of any integrated civil engineering system in today's rapidly changing computing environment. Even with enormous advancements in capabilities of computers and mobile tools, enhancing computational efficiency of algorithms is necessary to meet the changing demands for quick real time response systems. The finite element method is still the most widely used method of computational structural analysis; a robust, reliable and automated finite element structural analysis module is essential in a modern integrated structural engineering system. To be a part of an automated finite element structural analysis, an efficient adaptive mesh generation scheme based on R-H refinement for the mesh and error estimates from representative strain values at Gauss points is described. A coefficient that depends on the shape of element is used to correct overly distorted elements. Two simple case studies show the validity and computational efficiency. The scheme is appropriate for nonlinear and dynamic problems in earthquake engineering which generally require a huge number of iterative computations.

• 해양환경안전학회지
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• 제28권6호
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• pp.1013-1022
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• 2022

최근 전세계적으로 4차산업이 발전함에 따라 스마트·친환경 선박의 기술 개발이 가속화 되고 있다. 완전 무인화 또는 최소인원이 승선하는 자율운항선박과 친환경 연료(메탄, 암모니아, 전기 등) 이용 선박이 등장하게 되면서 선박에 승선을 하고 있는 기존 해기사의 역할이 크게 변화될 것으로 예상되고 있다. 향후 해기사의 경쟁력을 향상시키기 위해서는 미래 해기사 직업군을 예측하고 그에 맞는 교육 커리큘럼 개선과 교육환경 조성이 필요할 것으로 생각된다. 본 연구에서는 선행연구 검토와 해양계 대학교 재학생, 현직 해기사, 전문가의 브레인스토밍을 통해 미래에 해기사가 가질 수 있는 8개의 직업군을 도출한 후 리커트 척도를 이용하여 설문을 실시하였고, 그 결과를 바탕으로 미래 해기사 관련 유력 직업군을 도출하였다. 분류한 8개 직업군 중 가장 유력한 직업군은 자율운항선박 육상제어사, 화물(적양하) 원격 관리자로 나타났다. 또한, 이러한 직업군들과 4차산업에 우선적으로 교육해야 할 필수 교육 요소를 도출하여 제시하였다.

• 한국콘텐츠학회논문지
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• 제11권10호
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• pp.69-76
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• 2011

퀘스트는 게임 스토리의 최소단위로써, 퀘스트 스토리텔링을 연구하기 위해서는 퀘스트 구조 분석이 필요하다. 본 연구는 퀘스트의 구조를 파악하기 위해, 구조주의 서사이론에서 프롭의 민담기능을 도입하였다. 프롭이 등장인물의 불변요소로 제시한 31가지 민담기능을 MMORPG 퀘스트에 대입하여 분석하였다. 그 결과 퀘스트의 필수기능(13개), 부가기능(5개)를 도출하였고, 이 기능들이 어떤 순서로 전개되는지 살펴보았다. MMORPG 퀘스트는 필수기능의 순서에 따라, 그리고 부가기능을 선택사항으로 하면서 진행되고 구조가 반복되는 패턴을 보여주었다. 이들의 기능을 적절한 요소에 활용한다면 퀘스트 스토리텔링을 강화하고 다양한 이야기를 이끌어 나갈 수 있는 방안을 마련할 수 있을 것이다.

• 한국초지조사료학회지
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• 제1권1호
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• pp.2-9
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• 1978

A review of factors influencing grass and clover establishment, survival and yield at oversowing was made from the experimental results of home and abroad. The following conclusions are considered: (1) The existing vegetation present at oversowing appeared to be the most critical factor reducing establishment and survival of grass. Therefore, it is essential to check competition from the native vegetation before oversowing. (2) Although lime had comparatively little effect on yield of grassland, the general effect of lime should be more emphasized under our acid soil conditions to promote the availability of all the essential elements and the growth of microorganisms, and to reduce the toxic effects of nutrients. One to two tons of lime per ha at oversowing would be useful. (3) Phosphorus is one of the nutrients most generally deficient in grassland soils of Korea, consequently, this nutrients applied at oversowing is very effective. Application as much as 200kg of phosphorus per ha would be essential. (4) The effect of nitrogen on the establishment and survival of grass depends on the amount and density of the herbage present. The use of nitrogen in dense herbage adversely affected grass establishment and survival, possible because the fertilizer stimulated the growth of the eisting herbage. Around 40kg of nitrogen per ha may be enough at oversowing (5) Potassium is not as universally deficient in soils of native grassland as phosphorus. Therefore, it cannot be over-emphasized at oversowing. Studies determinig the optimum amount of potassium at of oersowing are needed.

• 한국군사과학기술학회지
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• 제16권2호
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• pp.154-159
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• 2013

Alignment tolerance for EO/IR airborne camera using common optic is an important factor in stabilization accuracy and geo-pointing accuracy. Before airborne camera is mounted on the aircraft, defining alignment tolerance and verification of it is essential in production as well as research and development. In this paper we establish basic concept on the definition and elements of alignment tolerance for airborne camera and propose how to measure each of those elements. Components and the measurement sequence of alignment tolerance are as follows: 1) tolerance of alignment between EO and IR LOS. 2) tolerance of sensor alignment. 3) tolerance of position reporting accuracy. 4) tolerance of mount alignment

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 추계학술대회 논문집 전력기술부문
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• pp.34-36
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• 2008

In this paper, we study on the necessity for limiting impedance of Superconducting Fault Current Limiter(SFCL) considering protective coordination. Several countermeasures have been proposed to protect the power system effectively from the larger fault current. Among them, the SFCL has been expected as one of the most effective solutions. However, the application of SFCL into power system can cause some problems, such as non-operation of instantaneous elements, of protective coordination because of limiting fault current. So we suggest that impedance of SFCL is must limited for operation of instantaneous elements. 'This method is essential to introduce application of SFCL into power distribution system.