• Title/Summary/Keyword: Configuration Models

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Configuration models for technology transfer from universities and research institutes to industries (대학 및 연구소와 산업계간 기술이전시스템의 구성 모델)

  • 문병근;조규갑
    • Proceedings of the Technology Innovation Conference
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    • pp.133-143
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    • 2001
  • Technology transfer from universities and research institutes to industries is recognized as a critical issue to strengthen industrial competitiveness, and the roles of technology transfer intermediaries are becoming one of the most important factors for successful technology transfer In today's global and knowledge-based economies, technology transfer services are started shifting to Internet and vertical transfer of technology from R&D labs to industries is becoming more emphasized than horizontal company-to-company transfer of commercialized technology. And the need of comprehensive technology transfer services necessitates cooperation among technology transfer intermediaries and networks offering complementary services. In order to respond to these changes, it is required to construct a new type of technology transfer system. But there are few researches on technology transfer system configuration for design and realization of technology transfer intermediaries. This paper presents the configuration models of technology transfer from universities and research institutes to industries. The configuration models are classified and described from the viewpoint of flows of information, technology and knowledge.

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대학 및 연구소와 산업계간 기술이전의 구성모델

  • 문병근;조규갑
    • Journal of Technology Innovation
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    • v.9 no.2
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    • pp.1-16
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    • 2001
  • Technology transfer is recognized as a critical issue to strengthen industri competitiveness in today's global and knowledge-based economies. The vertical transfer of technology from R&D labs to industries is becoming more emphasized than the horizontal company-to-company transfer of commercialized technology. The network and cooperation among technology transfer intermediaries are becoming more important with the increasing demand of the comprehensive technology transfer services. This paper presents the configuration models for technology transfer from universities and research institutes to industries. The configuration models are classified and discussed from the viewpoint of information flow, and also technology and knowledge transfer.

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Analysis of the Static and Dynamic Stability Properties of the Unmaned Airship

  • Lee, Hae Chang
    • International Journal of Aeronautical and Space Sciences
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    • v.2 no.2
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    • pp.82-94
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    • 2001
  • The purpose of this paper is to analyze the static and dynamic stability-of the unmanned airship under development ; the target airship's over-all length of hull is 50m and the maximum diameter is 12.5m. For the analysis, the dynamic model of an airship was defined and both the nonlinear and linear dynamic equations of motion were derived. Two different configuration models (KA002Y and KA003Y) of the airship were used for the target model of the static stability analysis and the dynamic stability analysis. From the result of analyses, though the airship is unstable in static stability, dynamic characteristics of the airship can provide the stable dynamic stability. All of the results, airship models and dynamic flight equations will be an important basement and basic information for the next step of developing the automatic flight control system(AFCS) and the stability augmentation system(SAS) for the unmanned airship as well as for the stratospheric airship in the future.

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Calculation of Electrodynamic Repulsion Force in Molded Case Circuit Breakers Using the 3-D Finite Element Analysis (3차원 유한요소 해석을 이용한 배선용 차단기의 전자반발력 계산)

  • Kim, Yong-Gi;Park, Hong-Tae;Song, Jung-Chun;Seo, Jung-Min;Degui, Chen
    • Proceedings of the KIEE Conference
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    • pp.137-140
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    • 2003
  • To the optimization design of molded case circuit breakers(MCCBs), it is necessary and important to calculate the electro-dynamic repulsion force acting on the movable conductor. With 3-D finite element nonlinear analysis, according to the equations among current-magnetic field-repulsion force and taking into account the ferromagnet, contact bridge model is introduced to simulate the current constriction between contacts, so Lorentz and Holm force acting on the movable conductor and contact, respectively, can be integrated to calculate. Coupled with circuit equations, the opening time of movable contact also can be obtained using iteration with the restriction of contact force. Simulation and experiment for repulsion forte and opening time of five different configuration models have been investigated. The results indicate that the proposed method is effective and capable of evaluating new design of contact systems in MCCBs.

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The Design and Analysis of Recognition Structure for Absolute Train Positioning System of High-speed Maglev Train System (초고속자기부상열차 절대위치검지시스템 인식구조 설계 및 분석)

  • Shin, Kyung-Ho;Shin, Duc-Ko;Lee, Jae-Ho;Lee, Kang-Mi
    • Journal of the Korean Society for Railway
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    • v.14 no.2
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    • pp.116-120
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    • 2011
  • For the train positioning system currently applied in high-speed MAGLEV train systems, it is classified into absolute positioning systems which discontinuously detect train positions, and relative positioning systems which continuously detect train positions. In this paper we analyze the configuration model and the numerical model of the absolute positioning system applied in TRANSRAPID which is a representative high-speed MAGLEV train, and design the two configuration models specific to the recognition structures of absolute positioning systems. We also verify the compatibility of the design models of absolute positioning system through simulation using MATLAB and propose the optimal configuration model of absolute positioning systems for high-speed MAGLEV train system.

Seismic Performance of Urban Structures with Various Horizontal Irregularities using Equivalent Static Analysis (다양한 수평비정형성을 갖는 도시구조물의 등가정적해석에 의한 내진성능분석)

  • Cui, Ji Long;Chey, Min-Ho;Kim, Sung-Il
    • Journal of Convergence Society for SMB
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    • v.6 no.1
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    • pp.25-32
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    • 2016
  • With the change and development of modem architecture, architectural configurations are increasingly diversified and irregular. However, the building configurations without proper seismic considerations may cause severe damages under earthquake loads. Therefore, it is necessary to establish and implement more properly classified, specific and advanced conceptual seismic design strategies. This study explores the relationship between building configurations and seismic performance by adopting several horizontal building configurations with various re-entrant corners. For the clear comparison of five different horizontal configuration models, almost aspects of structural properties are equalized. The equivalent static analyses are conducted with the aim of understanding the characteristics of various re-entrant comers under standard earthquake loads. The seismic advantages of regular configuration model are clearly approved and the structural weak points at the re-entrant comers are investigated numerically and graphically.

A Design of Channel Models for the ISDN Subscriber Loops (ISDN 가입자 루프에 대한 전송로 모델의 설계)

  • 백제인;박원식;이유경
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.19 no.2
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    • pp.293-305
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    • 1994
  • In this paper the efficient channel models of the subscriber loops for the ISDN U-interface digital transmission are presented. Several configuration medels of the loop network are adopted from the CCITT recommendations, and various parameters specifying the physical dimensions are determined in accordance with the measurements of the loop characteristics of Korea. A typical loop interfacing circuit is applied at both ends of the loops and the overall transmissing circuit model is obtained. Based on this circuit model of transmission. 3 types of signal path models, related to transmission, echo, and near end crosstalk noise are defined and their transfer function are respectively derived as the channel models. As examples of the proposed channel models, numerical calculation has been performed for some loop configuration models and the channel responses are investigation in both domains of frequency and time. It is shown that various changes of the loop characteristics can well be explained in terms of the proposed models. And these models can efficiently be used for the simulation of the digital transmission over the subscriber loop.

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Numerical Analysis of the Initiation and Development of Corrugation on a Gravel Road (수치해석적 기법을 활용한 골재 도로의 콜루게이션 발생 및 진전 분석)

  • Yun, Taeyoung;Chung, Taeil;Shin, Hyu-Soung
    • International Journal of Highway Engineering
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    • v.20 no.1
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    • pp.9-18
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    • 2018
  • PURPOSES : In this research, the initiation and development of corrugation on a gravel road with certain wheel and boundary conditions were evaluated using a coupled discrete-element method (DEM) with multibody dynamics (MBD). METHODS : In this study, 665,534 particles with a 4-mm diameter were generated and compacted to build a circular roadbed track, with a depth and width of 42 mm and 50 mm, respectively. A single wheel with a 100-mm diameter, 40-mm width, and 0.157-kg mass was considered for the track. The single wheel was set to run slowly on the track with a speed of 2.5 rad/s so that the corrugation was gradually initiated and developed without losing contact between the wheel and the roadbed. Then, the shape of the track surface was monitored, and the movement of the particles in the roadbed was tracked at certain wheel-pass numbers to evaluate the overall corrugation initiation and development mechanism. RESULTS : Two types of corrugation, long wave-length and short wave-length, were observed in the circular track. It seems that the long wave-length corrugation was developed by the longitudinal movement of surface particles in the entire track, while the short wave-length corrugation was developed by shear deformation in a local section. Properties such as particle coefficients, track bulk density, and wheel mass, have significant effects on the initiation and development of long-wave corrugation. CONCLUSIONS : It was concluded that the coupled numerical method applied in this research could be effectively used to simulate the corrugation of a gravel road and to understand the mechanism that initiates and develops corrugation. To derive a comprehensive conclusion for the corrugation development under various conditions, the driver's acceleration and deceleration with various particle gradations and wheel-configuration models should be considered in the simulation.