• 대한기계학회논문집A
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• 제28권12호
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• pp.1950-1957
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• 2004

Analysis for structures composed of materials containing regularly spaced in-homogeneities is usually executed by using averaged material properties. In order to evaluate the effective properties, a unit cell is defined and loaded somehow, and its response is investigated. The imposed loading, however, should accord to the status of unit cells immersed in the macroscopic structure to secure the accuracy of the properties. In this study, mathematical description for the periodicity of the displacement field is derived and its direct implementation into FE models of unit cell is attempted. Conventional finite element code needs no modification, and only the boundary of unit cell should be constrained in a way that the periodicity is preserved. The proposed method is applicable to skew arrayed in-homogeneity problems. Homogenized in-plane elastic properties are evaluated for a few representative cases and the accuracy is examined.

• 한국컴퓨터정보학회논문지
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• 제22권4호
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• pp.51-58
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• 2017

Research on the Development of EPUB SCP(Secure Content Protection) Technical Specification and International Standardization has been carried out as a R&D project granted by the Korea Copyright Commission since 2014. The research aims to build a standard framework for the EPUB DRM(Digital Rights Management) based on the Readium LCP(Licensed Content Protection) and KS EPUB DRM specifications, to develop element technologies for the framework, and to standardize it as an IDPF(International Digital Publishing Forum) industrial standard. One of the essential features of the EPUB DRM developed though this study is to support the lending model of the digital library. This paper introduces LSD(License Status Document) specification which is a DRM license management protocol for the digital library lending process, and also represents a model which can automatically test the implemented entities of the LSD specification, test scenarios and test materials.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2002년도 춘계학술발표대회 논문집
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• pp.22-26
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• 2002

The goal of this study is to replace the current forward 2-piece propeller shaft of 8 ton large truck made of steel with 1-piece composite propeller shaft. A low cost Glass/Epoxy composite propeller shafts were successfully developed, which satisfy requirements such as the capacity of static torque transfer, fatigue strength and bending natural frequency. Devising secure joining method of a composite tube and metal yoke was the most critical issue in successful development of a high torque composite propeller shaft. In this study, joining method using thermal interference fit was adopted for composite to metal joint. Optimum conditions of heating temperature and interference level of thermal interference fit were determined from thermal stress analysis using 3D finite element method. Static torsion test, fatigue test, RPM and balance test were performed to verify the design.

• 한국경영정보학회:학술대회논문집
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• 한국경영정보학회 2007년도 추계학술대회
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• pp.411-416
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• 2007

Only a few P3P-based privacy aware systems address the discrepancy between a service provider's privacy policy and the user's typical concerns-hence, putting service usage at risk. Moreover, since users are typically nomadic in pervasive computing services, their specific privacy concerns would dynamically change according to the surrounding context. This leads us to develop a dynamically adjusting P3P-based policy for a personalized, privacy-aware service as a core element of secure pervasive computing. Hence, the purpose of this paper is to propose a pervasive P3P-based negotiation mechanism for privacy control which functions in a dynamic and flexible way.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2006년도 춘계학술발표회 논문집
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• pp.111-118
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• 2006

The LBS (Location Based Service) location information is the element which is important decides the application of form service, Recently the location accuracy with the method which applies the wireless Internet DGPS improved inside 1 meter Like this. application of the LBS which corresponds In the location accuracy which Improves accurate the Location Information output system development which is accurate stands is essential. In this study which it sees it used 1:5000 digital map MS visual 6.0 Active X controls of the country geography intelligence Personnel and it developed the location information output module of web browser base. The location information output system which is developed it will be able to secure the convenient characteristic of precision and visual program of the digital map simultaneously and the maximum anger of LBS application is expected.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2003년도 추계학술대회 및 정기총회
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• pp.271-275
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• 2003

In these days, IT is the most essential element that secures continuous competitive advantage in current business organizations. The success of IT in rapid changing business environment depends on how we successfully secure and develop the IT human resources that have the appropriate knowledge and skills. The purpose of this study is to define the essential knowledge and skills for IT manager's role, and to find out appropriate training programs for the reinforcement of IT manager's competency from case studies. Through the training programs for IT managers, we find that it reinforces IT managers recognition, enlargement of human relation network, the obtainments of knowledge sharing culture, and the improvement of communication skills.

• 한국전기전자재료학회논문지
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• 제26권10호
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• pp.766-770
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• 2013

This paper tried to develop a BLDC electric motor securing the 800 W-level watertight structure for driving the outboard motor. For this purpose, this paper developed a high-efficient controller-integrating BLDC electric motor system for underwater propulsion and designed and developed a triple watertight structure. Besides, this study developed a outboard motor integrating motor, propeller and controller based on the production of a controller for BLDC motor which can the speed control by selecting low-voltage, high-current power element. The characteristics of developed outboard motor were 24 V input voltage, over 800 W motor output, and max. 3,000 rpm motor, and 84.9% motor efficiency, and the developed outboard motor could secure the watertight structure in 5 m in water depth.

• 한국산학기술학회논문지
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• 제13권6호
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• pp.2435-2440
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• 2012

본 논문은 기존의 전력절감기(Electric Saver)와 성능과 형상이 다른 전력절감기를 제작하기 위하여 SolidWorks를 활용하여 전력절감기함의 기초설계를 실시하였다. 기초설계를 바탕으로 전력절감기함에 하중이 집중되는 부분을 고려하여 해석하였으며 외함의 내구성을 보장하기 위하여 3차원 유한요소해석 코드인 ANSYS를 이용하여 응력(stress), 변형률(strain), 변형량(deformation)을 구하였으며 이를 제작에 사용된 상세설계에 반영하였다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2004년도 춘계학술대회 논문집
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• pp.202-205
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• 2004

A bumper comprises a bumper face, a bumper beam for distributing the load from the impacts applied to the bumper face and reinforcing the bumper, an absorber member interposed between the bumper face and the bumper beam, and a pair of bumper stays which secure the bumper beam to the vehicle body. A conventional bumper stay structure is assembled into several stamped parts, so several processes are needed and the structure is complicated. In this study the bumper stay is applied to the tubular hydroforming which is known to have several advantages such as the reduction of the number of the process and the part weight. The thickness distribution of the tube is mainly considered to evaluate the hydro-formability and the shape of the tube is determined.

• 한국과학교육학회지
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• 제1권1호
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• pp.61-72
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• 1978

By gettidg out from the existing class work with planning and execution in separate form of each class, and the research on each unit: it is suggested that the whole school system should be unified as oneunit through the proper restoration, and to aim the maximum effects of education, exalt thes pecialty of each teacher in the natural science course. Therefore: To select the text and material for the Element science carefully, secure the effectiveness of the study by each particulars of the text, and to establish the model for teaching properly arranged. Through the cooperative system of formational of teaching, to improve the basic knowledge of the course by deepening study objectives and separate teaching for each objects. Through the cooperative system, the main issues of the Elementary science course is solved, and by maintaining this method refine the speciality of teacher and rationalize he education operation.