• 전자공학회논문지A
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• 제32A권10호
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• pp.93-101
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• 1995

The evaluation of the logic capability and the library generation method of the multiplexor-based logic module is described. Optimizing logic module for silicon area and logic capability is essential to build a efficient FPGAs(Field-Programmable Gate Arrays). Because the multiplexor-based logic module can implement a large number of functions, it presents difficulties for library-based approaches. However, the logic functions of the logic module can be significantly reduced by lmiting the number of variables and sum-of-products and by removing same functions with different variable ordering using algorithm presented in this paper.

• 대한수학회보
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• 제48권1호
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• pp.23-33
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• 2011

Extending the notion of McCoy rings, we introduce the class of McCoy modules. Over a given ring R, it contains the class of Armendariz modules (over R). Some properties of this class of modules are established, and equivalent conditions for McCoy modules are given. Moreover, we study the relationship between a module and its polynomial module. Several known results relating to McCoy rings can be obtained as corollaries of our results.

• Kyungpook Mathematical Journal
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• 제45권3호
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• pp.445-453
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• 2005

We say that a module M is weak lifting if M is supplemented and every supplement submodule of M is a direct summand. The module M is called lifting, if it is weak lifting and amply supplemented. This paper investigates the structure of weak lifting modules and lifting modules having small radical over commutative noetherian rings.

• 한국지열·수열에너지학회논문집
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• 제19권1호
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• pp.14-25
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• 2023

In order to overcome the limitations of the individual renewable energy technologies such as photovoltaic (PV) and solar-thermal and effectively realize zero energy buildings, the photovoltaic-thermal (PVT) technology is being proposed. The current PVT module was simply combined with a PV panel and a solar-thermal collector. Therefore, it was difficult to commercialize because the PVT module is heavy and has no significant advantages compared to applying the individual technology. In this study, an attached PVT module is proposed for the commercialization and securing competitiveness in the renewable energy market. The attached PVT module enables on-site work with a simplified manufacturing process and can significantly reduce the supply price of the product. Moreover, it can be easily applied on already installed the PV panels. This study aims to commercialize the attached PVT module, the basic data was established as follows: (1) latest technology related to PVT module, (2) Global trends of the PVT module market. The possibility of commercialization of the attached PVT module was reviewed based on the results of the latest technology and market trends analysis. The supply price of the attached PVT module is lower than the existing products and it is considered that there is a high possibility of commercialization and introduction market with the advantage such as utilizing the existing PV industry and market. Moreover, the attached PVT module can be produced simultaneously the thermal and electrical energy, and it can be presented as an innovative alternative that can respond to the energy demand for residential sector.

• Design & Manufacturing
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• 제16권4호
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• pp.67-74
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• 2022

Injection molding is a cyclic process comprising of cooling phase as the largest part of this cycle. Providing efficient cooling in lesser cycle times is of significant importance in the molding industry. Recently, lots of researches have been done for rapid cooling of a hot-spot area using CO2 in injection molding. The CO2 flows under high pressure through small, flexible capillary tubes to the point of use, where it expands to create a snow and gas mixture at a temperature of -79℃. The gaseous CO2 removes heat from the mold and releases it into the atmosphere. In this paper, a CO2 cooling module was applied to an injection mold in order to cool a large area cavity uniformly and quickly, and the cooling performance of the injection mold was investigated. The product was a high-curvature molded part with a molding area of 300x100mm. Heat cartridges were installed in a stationary mold, and CO2 cooling module was inserted inside a movable mold. Through structural analysis, it was confirmed that the maximum deformation of mold with CO2 cooling module was 0.09mm. A CO2 feed system with a heat exchanger was used for cooling experiments. The CO2 was injected into the holes on both sides of the supply pipe of the cooling module and discharged through hexagon blocks to cool the mold. It took 5.8 seconds to cool the mold from an average temperature of 140℃ to 70℃. Through the experiment using CO2 cooling module, it was found that a cooling rate of up to 12.98℃/s and an average of 10.18℃/s could be achieved.

• 한국시스템다이내믹스연구
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• 제7권2호
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• pp.57-80
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• 2006

Nuclear technology made a great contribution to the national economy and society by localization of nuclear power plant design, and by stabilization of electricity price, etc. It is very important to conduct the retrospective analysis for the nuclear technology contribution to the national economy and society, but it is more important to conduct prospective analysis for the nuclear technology contribution. The term "technology value" is often used in the prospective analysis to value the result of technology development. There are various definitions of technology value, but generally it means the increment of future revenue or the reduction of future cost by technology development. These technology valuation methods are widely used in various fields (information technology or energy technology, etc). The main objective of this research is to develop valuation methodology that represents unique characteristics of nuclear power technology. The valuation methodology that incorporates market share changes of generation technologies was developed. The technology valuation model which consists of five modules (electricity demand forecast module, technology development module, market share module, electricity generation module, total cost module) to incorporate market share changes of generation technologies was developed. The nuclear power technology value assessed by this technology valuation model was 3 times more than the value assessed by the conventional method. So it was confirmed that it is very important to incorporates market share changes of generation technologies. The valuation results of nuclear power technology in this study can be used as policy data for ensuring the benefits of nuclear power R&D (Research and Development) investment.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1988년도 한국자동제어학술회의논문집(국내학술편); 한국전력공사연수원, 서울; 21-22 Oct. 1988
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• pp.353-359
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• 1988

In this paper, the design and implementation of a multi-processor based die bonder machine for the semiconductor will be described. This is a final research results carried out for two years from June, 1986 to July, 1988. The mechanical system consists of three subsystems such as bonding head module, wafer feeding module, and lead frame feeding module. The overall control system consists of the following three subsystems each of which employs a 16 bit microprocessor MC 68000 : (i) supervisory control system, (ii) visual recognition / inspection system and (iii) the display system. Specifically, the supervisory control system supervises the whole sequence of die bonder machine, performs a self-diagnostics while it controls the bonding head module according to the prespecified bonding cycle. The vision system recognizes the die to inspect the die quality and deviation / orientation of a die with respect to a reference position, while it controls the wafer feeding module. Finally, the display system performs a character display, image display ans various error messages to communicate with operator. Lead frame feeding module is controlled by this subsystem. It is reported that the proposed control system were applied to an engineering sample and tested in real-time, and the results are sucessful as an engineering sample phase.

• ETRI Journal
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• 제28권1호
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• pp.9-16
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• 2006

In this paper, we analyzed and measured the electrical crosstalk characteristics of a 1.25 Gbps triplexer module for Ethernet passive optical networks to realize fiber-tothe-home services. Electrical crosstalk characteristic of the 1.25 Gbps optical triplexer module on a resistive silicon substrate should be more serious than on a dielectric substrate. Consequently, using the finite element method, we analyze the electrical crosstalk phenomena and propose a silicon substrate structure with a dummy ground line that is the simplest low-crosstalk layout configuration in the 1.25 Gbps optical triplexer module. The triplexer module consists of a laser diode as a transmitter, a digital photodetector as a digital data receiver, and an analog photodetector as a cable television signal receiver. According to IEEE 802.3ah and ITU-T G.983.3, the digital receiver and analog receiver sensitivities have to meet -24 dBm at $BER=10^{-12}$ and -7.7 dBm at 44 dB SNR. The electrical crosstalk levels have to maintain less than -86 dB from DC to 3 GHz. From analysis and measurement results, the proposed silicon substrate structure that contains the dummy line with $100\;{\mu}m$ space from the signal lines and 4 mm separations among the devices satisfies the electrical crosstalk level compared to a simple structure. This proposed structure can be easily implemented with design convenience and greatly reduce the silicon substrate size by about 50 %.

• 센서학회지
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• 제31권6호
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• pp.376-382
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• 2022

A triboelectric nanogenerator (TENG) can obtain electrical output due to the reciprocal motion between two objects (i.e., rubbing), in which repetitive contact is made. High reliability, stable output, and high reproducibility are important aspects of the electrical output obtained through a TENG as a sensor or generator, thus enabling its meaningful use. Therefore, many researchers fabricated TENGs into individual parts in the form of one module type to obtain high reproducibility and reliability. Since a TENG manufactured as a module type operates as a single device, it is possible to collect kinetic energy and convert it into electrical energy through the interaction between internally configured elements without the need for a separate structure. In addition, it is relatively easy to apply the size to the body, machine tools, and natural environment by simply adjusting the size suitable for use and surrounding environmental conditions. In this paper, the application cases of module-type TENGs are divided into four areas, and the research progress of module-type TENGs in each area is extensively reviewed.

• 인지과학
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• 제14권3호
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• pp.13-21
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• 2003

이 연구에서는 기존의 지능형 교수기계와 또래 튜터링의 단점을 보완하여 '가르치기를 통한 학습'을 위한 교수가능 에이전트(Teachable Agent, 이하 TA) 의 이론적 배경 및 설계방안을 제시하고자 한다. TA는 학습자가 컴퓨터 에이전트를 가르치는 과정을 통해 학습하는 시스템으로 교수 Module, 묻고 답하기 Module, 테스트 Module, 학습자료 Module 등의 4 가지 Module로 구성된다. 교수 Module에서는 개념도(concept map)의 구성을 통해 튜터 역할을 하는 학습자가 TA 의 심성모형 (mental model)을 수정하고 update하게 되며, 묻고 답하기 Module에서는 인터렉티브 창을 통해 튜터와 TA가 제한된 방식으로 학습내용에 관한 질문과 응답을 함으로써 개념도를 수정보완하게 된다. 테스트 Module에서는 튜터가 가르친 TA가 미리 정해놓은 학습목표에 도달하였는지를 평가하게 된다. 테스트 결과 TA가 일정 수준에 도달하지 못한 경우에는 개념도의 재수정 과정을 통해 계속적인 학습이 이루어지도록 한다. 학습자료 Module은 튜터가 참고할 자료를 제공해 주는 Module이다. 이러한 TA는 튜터의 역할을 담당하는 학습자에게 깊이 있는 인지적 처리와 능동적인 학습동기를 경험하도록 함으로써 실제 교육현장에서의 유용한 교수/학습도구로 활용될 수 있을 것으로 기대된다.