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        검색결과 432

        221.
        2009.03 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The effort for GSI based IT system consolidation has been continued due to the increase of the system and complication increase of system connection, mainly by the global company. Since successful example of GSI realization by part of developed company affect to Korea, global level IT system consolidation has been examined mainly by the domestic company that have great deal of overseas business. Although they have examined consolidation possibility mainly on R&D, finance, operation management part which is the base part of company management, there are limitation for consolidation realization because of the difference between regional business problem of huge cost needed for consolidation. To overcome these realization limitations, it is necessary to lead risk and cost reduction through stepwise part unity and decide Priority Evaluation Framework for Consolidation target and systematic consolidation strategy. For GSI realization, appropriate distributions of unification time according to target system are needed. In this study, based on easiness and usefulness of consolidation and connection between the targets, evaluation methodology for Priority Evaluation Framework of system consolidation has been developed. Priority Evaluation Framework has been decided by applying developed methodology to global production company of high tech industrial part. Through this methodology, companies can realize successful and stable GSI by investing global resources intensively by Priority Evaluation Framework of consolidation target system
        4,000원
        222.
        2009.03 KCI 등재 구독 인증기관 무료, 개인회원 유료
        본 연구의 목적은 TV 화질에 대한 사용자들의 심리적 특성을 평가하기 위한 화질평가척도를 개발하고, TV 화질의 심리 특성과 물리적 특성의 관계를 확인하는 것이다. TV 화질과 관련된 형용사 152개 중 집단설문(남녀 대학생 80명)을 통하여 TV 화질을 잘 표현하는 형용사로 19개의 형용사를 선정하였다. 선정된 형용사는 다음과 같다; '깔끔하다-지저분하다', '깨끗하다-더럽다', '산뜻하다-침울하다', '편안하다-긴장된다', '매끄럽다-거칠다', '밝다-어둡다', '화려하다-수수하다', '변화스럽다-단조롭다', '자연스럽다', '감각적이다', '만족스럽다'. 126명의 남녀 대학생을 대상으로 이들 형용사의 유사성 평정을 실시하고, 유사성 점수에 대하여 요인분석(주성분분석, oblique 회전)을 실시한 결과, '깔끔함' 차원과 '화려함' 차원으로 분류되었다. 그리고 31명의 남녀 대학생을 대상으로 TV 화질에 대한 감성과 물리적 특성과의 관계를 확인하였다. 그 결과 TV 화질에 대한 감성 형용사들은 밝기, 명암, 색농도와 색상의 변화에는 민감하였으나, 선명도의 변화에는 민감하지 않은 것으로 나타났다.
        4,000원
        223.
        2008.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        In this paper, we introduce the performance evaluation and development of Raw VLBI Data Buffer(RVDB) system for the synchronized playback processing of observed data in Korea-Japan Joint VLBI Correlator(KJJVC). The high-speed correlation processing system is under development so that the radio data obtained with 8192 channels and 8 Gbps speed from 16 stations will be able to be processed. When the recorded data of each station are played to correlator, the time synchronization of each station is very important because the correlator should process the data obtained with same time and condition. There are many types of recorder systems in the East Asia VLBI Network (EAVN). Therefore it is required to prepare the special time synchronized playback processing system to synchronize the time tag of observed data. The developed RVDB system consists of Data Input Output(DIO), 10GbE switch, and Disk Data Buffer(DDB). It can record the data with maximum 2 Gbps speed, and can play back the data to correlator with nominal 2 Gbps speed. To enable to play back the data of different playback system to the correlator, we developed the high-speed time synchronized playback processing system. We carried out the experiments of playing back and correlation for gigabit correlator and VCS trial product so as to confirm the performance of developed time synchronized playback processing system. In case of online and offline playing back experiment for gigabit correlator, we confirmed that the online and offline correlation results were the same. In case of playing back experiment for VCS trial product, we verified that the wide band and narrow band correlation results were also the same. Through the playing back experiments of RVDB system, the effectiveness of developed RVDB system was verified. In this paper, the system design, construction and experimental results are shown briefly.
        5,100원
        224.
        2008.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        A software simulator is developed for verifying the VLBI Correlation Subsystem (VCS) trial product hardware. This software simulator includes the delay tracking, fringe rotation, bit-jump, FFT analysis, re-quantization, and auto/cross-correlation functions so as to confirm the function of the VCS trial product hardware. To verify the effectiveness of the developed software simulator, we carried out experiments using the simulation data which is a mixed signal with white noise and tone signal generated by software. We confirmed that the performance of this software simulator is similar as that of the hardware system. In case of spectral analysis and re-quantization experiment, a serious problem of the VCS hardware, which is not enough for expressing the data stream of FFT results specified in VCS hardware specification, was found by this software simulator. Through the experiments, the performance of software simulator was verified to be efficient. In future, we will improve and modify the function of software simulator to be used as a software correlator of Korea-Japan Joint VLBI Correlator (KJJVC).
        5,200원
        229.
        2008.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        지속적인 도로 건설에도 불구하고 이용차량의 급증으로 인해 도로에서 발생하는 혼잡은 만성적인 수준에 도달했으며, 도로에서의 이동성 및 정시성 저하를 초래하는 등 심각한 교통문제를 유발하고 있다. 이러한 교통문제를 해결하기 위해서는 소통상태 추이 및 혼잡 징후 파악, 혼잡 원인 및 영향범위 분석 등을 통해 혼잡관리 방안을 수립 시행하는 일련의 과정이 필요한데, 이를 위해서는 교통상태를 모니터링 할 수 있는 지표의 개발이 가장 선행되어야 할 중요한 사항이다. 이러한 이유로 미국을 비롯한 여러 나라들에서는 다양한 형태의 혼잡판단기준 및 혼잡지표를 개발하여 왔다. 본 연구에서는 국내 실정에 부합하고 실효성 있는 교통소통관리를 위해 기존 혼잡지표들의 특징 및 국내 적용 가능성을 검토하여 향후 새로운 혼잡지표의 기능 및 요구사항 등에 대한 개발방향을 제시하였다.
        4,000원
        230.
        2008.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        This study describes the development principles of the Elementary English Digital Textbook (MEDT) and provides suggestions for the future development of English digital textbooks based on the evaluation of MEDT contents. With these purposes, the study firstly presents relevant theories about the instructional design, e-learning strategies, second language acquisition, and English teaching theories to investigate on what theoretical foundation the MEDT was developed. It then examines how the MEDT integrates and incorporates new technologies such as speech recognition, automatic writing scoring system, games, flash animation, and digital storytelling into a wide variety of English learning activities such as listening, speaking, reading, and writing. Thirdly, the study reports the learners" and experts" evaluations of MEDT with respect to contents, learning activities, interest, levels, and technological functions. Lastly, based on the evaluation of the MEDT, some suggestions are made on the effective use of MEDT for the implementation of enhanced, high-technological, and motivating English learning environments in Korean elementary schools.
        7,000원
        231.
        2008.03 KCI 등재 구독 인증기관 무료, 개인회원 유료
        A fresh water generator is designed to produce fresh water from sea water. This generator produces fresh water by evaporating and condensing sea water, and it uses the engine jacket water as the heat source. While a vessel is sailing, it uses main engine coolant to produce fresh water and also, while a vessel is in port, it uses auxiliary engine coolant. After all, sea water is evaporated the heat which the coolant contains, so it can produce fresh water economically, because it dose not need additional heat source. A salinity meter is a densitometer measuring the concentration of salt in sea water. This study designed the multi-function salinity meter(SAL-2000). SAL-2000 has many functions such as conductivity, salinity, flow rate, and so on. In order to evaluate the performance of SAL-2000, the measuring experiments such as salinity, flow rate, and pressure have been conducted.
        4,000원
        232.
        2008.03 KCI 등재 구독 인증기관 무료, 개인회원 유료
        국내에 설치되고 있는 가드레일의 단부처리시설(end treatments)은 차량의 관통이나 전복을 유발할 수 있는 형상을 하고 있어 사고 시 탑승자가치명상을 입을 가능성이 매우 높다. 실제로 차량이 가드레일의 단부에 충돌하였을 경우, 가드레일이 차량내부를 관통하여 탑승자에게 직접적인 상해를 입히는 경우가 발생되고 있다. 본 연구에서는 미국과 유럽의 성능평가기준(performance evaluation criteria)에 근거하여 국내 실정에 적합한 단부처리시설에 관한 성능평가기준(안)을 제시하였다. 또한 외국의 설치사례 및 연구사례를 조사하여 단부처리시설의 mechanism을 파악하고 국내 도로환경 에 적합한 단부처리시설을 제안하였다. LS-DYNA 프로그램을 이용한 컴퓨터 시뮬레이션을 통해 제안된 단부처 리시설에 대한 성능을 검증한 결과 성능평가기준(안)에 모두 만족한 결과를 보였으며, 개발 단부처리시설에 대한 실물차량 충돌시험을 수행한 결과 성능평가기준(안)의 탑승자 보호성능, 단부처리시설의 거동, 충돌 후 차량의 거동을 모두 만족하였다. 국내 최초로 탑승자의 안전을 고려하여 개발된 단부처리시설이 고속도로나 국도에 설치된다면 단부충돌사고의 심각성을 감소시켜 도로의 안전성을 향상시킬 수 있을 것으로 사료된다.
        4,300원
        233.
        2008.02 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Survey on the food intake status and health condition of the elerly over 65 years old living in Damyang Jeonnam was performed and meal menus for the pavillion were developed using local products. Allowance of the elderly less than 100,000 won was 45%. The local products of the area recognized by the elderly were bamboo shoot (30%) > bamboo (22.5%) > bamboo basket (12.5%) > do not know (15%) > green tea (10%) > rice(7.5%) > vegetable. In dental health, 52.5% of them had bad condition but 62.5% did not use denture at all. The most favorate foods were Korean (92.5%) and Chinese and Japanese were favored by 5%, and 2.5%, respectively. In percentage of eat-out and use of instant foods, 42.5% of them answered that eating-out chances were very rare and 62.5% answered that they do not use instant foods at all. Potassium intakes for the male and female elderly were significantly very low with values of 2579.2 mg and 2601 mg, respectively (p < 0.05). Calorie intakes for men were 1678.5 kcal, which was only 84% of RI and 1470.8 kcal for women (92%). Shortages of nutrition including calcium intake and others were very serious and the meal was not nutritionally balanced based upon the study of GMDFO. The menu for the elderly in busy farming season of the area were developed with the use of local products and the information from the study.
        4,000원
        234.
        2008.01 구독 인증기관 무료, 개인회원 유료
        개발도상국을 중심으로 우리나라의 경제개발과 성장의 기반이 되는 인적자원개발과 교육시스템에 대해 지식과 경험의 공유 및 교류에 대한 요구가 점차 증가하고 있다. 우리나라는 교육 분야에서 이러한 요구에 적절히 대응하고 우리 교육 · 문화와 e- 러닝 산업의 해외진출 등의 기회로 활용하기 위해 국제교육협력을 위한 휴먼네트워크를 보완하고 강화할 필요가 있다. 그리고 이러한 요구들을 반영하기 위해 한국과의 교류협력에 영향력을 행사할 수 있는 해외 고위공무원 기업인 등을 대상으로 하는 초청연수 사업이적절한 대안으로서 추진되어 왔다. 그러나 공급자 중심의 사고방식, 민간의 참여부족, 사업성과 측정 미비, 사업추진 주제간 협력 부재 등으로 성과창출이 제한적이었다. 이러한 문제점에 대한 대안을 마련하고자 관련 선행연구를 기초로 본 블랜디드 러닝 기반 문제중심 국제연수과정의 개발과 함께 평가연구를 진행하였다. 평가연구는 크게 반응도 평가, 이해도 평가, 현업적용도 평가로 실시되었다. 그 결과 블랜디드러닝 기반 문제중심 국제연수과정이 교육생들의 이해도 향상은 물론 실제 각자가 가지고 있는 문제해결에 도웅을 주었음을 확인할 수 있었다. 그리고 이러한 결과를 바탕으로 국제연수과정개발에 있어서 고려점과 시사점을 논의하였다.
        6,100원
        235.
        2007.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        It is well known that the test and evaluation plan (TEP) is very crucial in the successful development of safety-critical systems. As such, this paper discusses an approach to the development of the TEP for a system that should meet safety requirements in the systems development process. It is studied how to incorporate the result of preliminary hazard analysis (PHA) in generating the safety requirements. It is also discussed how to deal with them when the system requirements (i.e., functions, performance, constraints, components, etc) and the safety requirements are integrated into one model. While doing so, we have constructed the required traceability among them, which is necessary and very useful when the safety requirements need to be corrected or be changed. The use of the traceability makes it possible to easily check out whether and how the safety requirements are properly incorporated in the system design process. Furthermore, without the verified traceability, the system cannot be changed or upgraded later. In order to implement the model on a computer-aided tool, we have constructed a database (DB) schema. As a result, the implemented model/DB allows to automatically generate TEP which can be used to measure the performance and safety level of the developed system.
        4,000원
        236.
        2007.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        In order to understand the breakthrough behaviour of iodine vapours on impregnated carbon systems, an active carbon, 80 CTC grade, 12×30 BSS particle size and 1104 m2/g surface area, was impregnated with metal salts such Cu, Cr, Ag, Mo and Zn, and an organic compound Triethylene diamine (TEDA) to prepare different carbon systems such as whetlerite, whetlerite/TEDA, whetlerite/KI/KOH and ASZMT. The prepared adsorbents along with active carbon were characterized for surface area and pore volume by N2 adsorption at liquid nitrogen temperature. These carbon systems were compared for their CT (concentration X time) values at 12.73 to 53.05 cm/sec space velocities and 2 to 5 cm carbon column bed heights. The carbon column of 5.0 cm bed height and 1.0 cm diameter was found to be providing protection against iodine vapours up to 5.5 h at 3.712 mg/L iodine vapour concentration and 12.73 cm/sec space velocity. The study clearly indicated the adsorption capacities of carbon systems to be directly proportional to their surface area values. Dead layer with all the prepared carbon systems was found to be less than 2.0 cm indicating it to be minimum bed height to have protection against I2 vapours. Effect of carbon bed height and flow rate was also studied. The active carbon showed maximum protection at all bed heights and flow rates in comparison to all other impregnated carbon systems, showing that only physical adsorption is responsible for the removal of iodine vapours.
        4,000원
        237.
        2007.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
          This study aims to design and implement a learning evaluation system using .NET which is developed by Microsoft. .NET technology supports higher processing speed than ASP technology. The learning evaluation system is based on the web, consists of admini
        4,000원