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Temperature-dependent current-voltage characteristics of organic light-emitting diodes(OLEDs) were studied in a device structure of ITO/TPD/A1g3/Al. The OLEDs were based on the molecular compounds, N,N'-diphenyl-N,N'-bis(3- methylphenyl)-1,1'-diphenyl-4,4'-diamine (TPD) as a hole transport and tris(8-hydroxyquinoline) aluminum (Alg3) as an electron transport and emissive material. The current-voltage characteristics were measured in the temperature range of 10K and 300K. We analyzed an electrical conduction mechanism of the OLEDs using space-chargelimited current(SCLC) and Fowler-Nordheim tunneling.
This paper presents a geometrical modeling technique including an energy method for defining a regular texture field made by an RP apparatus. The texture field is supposed to be made from both a parametric surface and a non-analytic STL CAD model using an energy minimization analogy based on energy constraints. Designing surface texture for rapid prototyping, however, is difficult due to complex macro-structure of the tiny texture geometry that must be compatible with the non-traditional manufacturing method of rapid prototyping. An application of geometric modeling techniques to development of a computer-aided design tool for solving the addressed problems is proposed in this paper. Manufacturing constraints are identified, formulated, and introduced into a unified design constraints framework being incorporated into the design of a texture cell. Also, an energy minimizing parametric geometry is devised and implemented to create an optimal texture geometry.
Information providers of internet are increased by the fast technical development of network, and they provide a vast amount of information in various fields. Because of this reason, it becomes too hard for users to get fast what they want. There are several search engines that help users with the keyword matching method, but it is still a burden to users to find suitable keywords. Therefore we implement the intelligent information retrieval agent(HILA-la : HongIk Information Agent) that converts user's queries to forms to be compatible to user's thought and suitable to a specific domain, and provides the necessary information. The knowledge base about an animals domain has been built in an ontological aspect to share information between information agents and the HILA-la system supplies necessary information by processing the queries of users and other agents, and also shows URL list of proper web pages by extending given queries based on knowledge base. We also supplement new operators for users to represent their thought more clearly and make the system behave more intelligent by learning from accumulated results and user feedback. HILA-la has been developed on Windows 98 with Visual C++ 5.0, CLIPS and MS Access, the results are promising in terms of the information provider.
지금까지 Multimedia의 技術的 問題를 檢討하였으며, 現在使用 되는 응용분야와 근 시일내 사용될 응용분야에 대하여 알아보았다. Multimedia는 앞서 言及했듯이 휴먼인터페이스의 開發과 함께 發展해왔다. 그러므로 이 分野의 技術的 發展으로 音聲認識, 눈 追跡裝置등은 소프트웨어 中機者나 案內者의 槪念으로 Multimedia의 완벽한 구현에 박차를 가할 것이다. 또한 핵심기술인, motion 비디오 압축 알고리즘과 감압 하드웨어의 開發이 促進되어 實時間에 full-motion 비디오를 壓縮할 수 있는 병렬처리장치를 具備한 最高의 VISL칩 발달을 앞당길 것이다. 이로 인하여 個人用 컴퓨터에 어울리는 크기로 하나의 보드위에 設置되게 될것이다. 또한 지금의 하드웨어보다 더큰 용량과 選擇幅(bandwidth)를 갖추어 複雜한 화상을 實時間에 압축하고, 고품질의 motion 비디오를 合成하여 放送을 支援할 수 있을 것이다. 끝으로 이러한 技術的인 發展으로 90년대는 個人用 컴퓨터에 Multimedia가 實現될 것이며 기존의 PC가 할 수 있던 임무를 훨씬 초과하여 수행될 것을 기대 한다.
Rapid prototyping can fabricate physical models directly from the CAD models. Since actual production of a physical model using traditional techniques has been quite expensive, a prototyping apparatus like Stereolithography can recently be used to get physical verification of a product design rapid and economic. This, however, still costs some expenses enough to take an interest in more economic methods, visual simulation techniques. Development of an intermediate geometric model of the product design and careful inspection of its virtual shape before the real fabrication take no physical cost. In this paper we propose an image simulation method especially for supporting an rapid prototyping application. The method can demonstrate its capability of image simulation by comparing the simulated images with their physical models.
Since the technology is one of the important factor for the development of countries or companies, evaluation of technology became essential for investment on venture company, technology trading and M&A. The appropriate evaluation of technology is so important yardstick of competence of business that, in this thesis, the theories and the present conditions of technology evaluation model in several institutes are compared and analysed and also the desirable direction for the future right model are suggested. Technology evaluation model is basically composed of three parts: cost-market-income approach method, technology factor method, real option method. We have to choose proper model among several methods because there are various technology evaluation methods and they have different merits and demerits. So that, due to some limits for each model, there is no complete one which can drive the right valuation by itself at one time. Thus, right valuation seems to be required that several different methods of each model should be applied and analysed at the same time and then decide the right answer that satisfies the suggested conditions.
This paper presents the current trends and general problems for the cooperative education programs based on the industry - university partnership. Many advanced countries in an effort to enhance engineering education have been long stressed that a key element for the industry activities must be the strong partnership by industry in the educational process especially at the undergraduate level. Thus, to make a successful cooperative education goal, the university's courses and activities are regularly reviewed by the industry and university advisory committees. In recent years, the education programs from the European countries and the USA have been introduced to the academic courses and research activities of Korean universities for an implication of university and industry cooperation. Engineering education programs are headed by government funds as a part of the relocation of the university students and the researchers. But these kinds of relocation policies may produce more problems and weaken Korean Industry's competitiveness in world markets.
In this note, we consider a condition for a quasi*-barrelled space(or sequentially quasibarrelled) to be sequentially barrelled. And we obtain that a quasi*-barrelled space is sequentially quasibarrelled. Finally we investigate equivalent relationships between barrelled, σ-barrelled and *-barrelled spaces, and strongly Mackey, *-barrelled and quasi*-barrelled spaces respectively.
본 논문에서는 network analyzer와 안테나를 이용하여 Ku-밴드 레이다 시스템을 구성하고, 그 레이다 시스템을 이용하여 RCS를 정확히 측정할 수 있는 기술을 개발한다. 정확한 산란 세기를 측정하기 위해서는 레이다 시스템을 정확히 보정하는 기술(calibration technique)이 필요하다. 본 논문에서는 레이다 시스템을 정확히 보정하기 위해서 RCS를 알고 있는 sphere, cylinder, trihedral의 이론적 RCS를 구하고 보정되지 않은 레이다 시스템으로 측정한 RCS와 비교한다. 여기에서 system loss, 거리 보정, 안테나 위치 보정과 같은 오차를 줄이고 산란 특성을 정확히 계산하는 보정기술을 연구하였다.
With the growing competitive pressure from market participants, utilities, consumer and government, analyses of existing competitive electricity market become more important. The presence of constraints or congestion in the transmission system lead to occurrence of Constrained On/Off generators which can significantly increase the potential of exercising market power. Since the congestion in the network depends on the several factors such as uncertain variation of the load and the structure of the network, the market power cannot be simply analyzed through the existing indices. This paper shows the treatment procedure of constraints and conceptual formulation under uniform pricing scheme. Also, this study presents a systematic analysis and a mitigation measure on local market power which occurs due to transmission constraints