• Title/Summary/Keyword: 강제성

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Structural Optimization of Heat Dissipating Structure with Forced Convection (강제 대류가 있는 열소산 구조물의 구조최적설계)

  • Yoon, Gil-Ho;Kang, Nam-Cheol
    • Journal of the Korean Society of Propulsion Engineers
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    • v.13 no.1
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    • pp.51-57
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    • 2009
  • In this study, a new topology optimization method is developed to design heat-dissipating structure with forced convection. To cool down electrical devices or mechanical machines, two types of convection models have been widely used: the natural convection model with a large Archimedes number and the forced convection with a small Archimedes number. In these days, lots of engineering application areas such as electrochemical conversion devices (Fuel cell) or rocket propulsion engines adopt the forced convection to dissipate the generated heat. Therefore, to our knowledge, it becomes an important issue to design flow channels inside which the generated heat dissipate. Thus, this paper studies optimal topological designs considering fluid-heat interactions. To consider the effect of the advection in the heat transfer problem, the incompressible Navier-stokes equation is solved. This paper numerically studies the coupling phenomena and presents optimal channel design considering forced convection.

Mandatory Lane-changing Behavior under the Congested Work Zone Traffic Operation (정체상황에서의 강제 차로변경행태 분석 (도로공사로 인한 차로폐쇄 시뮬레이션 기반))

  • Kang, Kyeong-Pyo;Lee, Kwang-Hoon
    • Journal of Korean Society of Transportation
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    • v.26 no.1
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    • pp.215-223
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    • 2008
  • Due partly to lack of actual lane-changing data and partly to few studies on simulation functions to consider the lane-changing behavior, it may result in significant difference between simulation-based and real conditions. The objectives of this study are to estimate the set of mandatory lane-changing models and to analyze their features, depending on the merge control strategies under the lane-closed work zone operations. To achieve them, first, the elaborated calibration is required to simulate the mandatory lane-changing behaviors with the actual field data. Second, one can estimate their models with the logistic regression models, to obtain traffic variables as well as the lane-changing frequencies under the various levels of work zone traffic conditions. As a result, one can state that the well-calibrated simulation has the potential to properly reflect the target mandatory lane-changing behaviors. In addition, it should be mentioned that the set of proposed models is not practicable but preliminary result needed to identify the relations between the actual traffic conditions and lane-changing maneuvers and to develop their practical models for the actual applications.

Women's Sexual Harassment Incident in The Elevator Using χ2 Histogram (χ2히스토그램을 이용한 승강기 내에서 여성의 성 추행 사건 추출)

  • Shin, Seong-Yoon;Kim, Hee-Ae;Jin, Chan-Yong;Park, Sang-Joon;Rhee, Yang-Won;Lee, Hyun-Chang
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2013.05a
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    • pp.104-106
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    • 2013
  • In crime, sexual harassment is acts arouse sexual shame to the other man by the physical body contact in order to obtain sexual gratification. One of sexual abuse, molestation, means indecent assault. The different point of indecent assault and sexual harassment is 'Harassment' as means of 'assault or intimidation'. In this paper, these incidents of sexual harassment to women in elevators extract by ${\chi}^2$ histogram.

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Extraction of Sexual Molestation to Women in Elevator (엘리베이터 내에서 여성의 성 추행 사건 추출)

  • Shin, Kwang-Seong;Lee, Jong-Chan;Park, Sang-Joon;Rhee, Yang-Won;Lee, Hyun-Chang;Jin, Chan-Yong
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2012.10a
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    • pp.47-49
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    • 2012
  • Sexual harassment is acts arouse sexual shame to the other man by the physical body contact in order to obtain sexual gratification. One of sexual abuse, molestation, means indecent assault. The different point of indecent assault and sexual harassment is 'Harassment' as means of 'assault or intimidation'. In this paper, these incidents of sexual harassment to women in elevators extract by color histogram.

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The Analysis of Current Situation of the Building Precision Safety Inspection and Precision Safety Diagnosis Cost from Practitioners Viewpoint (실무자 관점에서의 건축물 정밀안전점검 및 정밀안전진단 실행대가 현황분석)

  • Lee, Jong-Phil;Lim, Nam-Gi
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.22 no.4
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    • pp.37-41
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    • 2018
  • Recently, interest in the safety and maintenance of the structures is growing. However, due to the low-cost order placed by the ordering organization, the safety diagnosis specialized institution becomes insolvent and many problems have arisen due to insufficient inspection and diagnosis. Therefore, in this study, the current status of bid cost was examined through the survey of the practitioners and case analysis. As a result, Precision safety inspection is deemed that it is necessary to increase the efficiency of the criteria cost and to strengthen the rigidity of the criteria cost rather than adjusting the criteria cost. Precision safety diagnosis, the criteria cost for structures with a floor area of less than $10,000m^2$ is lowered to 80 % from the current standard. For structures larger than that, the current criteria cost are applied, but it is deemed necessary to strengthen the rigidity of the criteria cost.

Theoretical Curve of Classical Site Attenuation for Forced Resonant Type EMI Dipole Antennas (강제 공진형 EMI 다이폴 안테나에 대한 시험장 감쇠량 이론 곡선)

  • Ju Chang-Hyun;Park Eun-Jung;Kim Ki-Chai
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.6 s.97
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    • pp.571-579
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    • 2005
  • This paper presents the classical site attenuation characteristics of a forced resonant electromagnetic interference (EMI) dipole antenna for frequencies below 80 MHz. The coupled integral equations for unknown current distribution are solved by the Galerkin's method of moments with piecewise sinusoidal functions. The results show that the forced resonant type EMI dipole antenna for frequencies below 80 MHz can be used effectively for measuring the classical site attenuation of horizontal polarization. The theoretical site attenuation curves presented can be used as reference curves for evaluating the performance of an open area test site.

Wave Interpretation of Forced Vibration of Finite Cylindrical Shells (탄성파를 이용한 유한 원통셸의 강제진동 해석)

  • 길현권
    • The Journal of the Acoustical Society of Korea
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    • v.18 no.2
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    • pp.83-89
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    • 1999
  • The forced vibration of a finite cylindrical shell has been analyzed from an elastic wave viewpoint. The displacement vector is used to formulate the vibration field, that is regarded as a superposition of disturbances due to elastic waves propagating on the shell. The reflection matrix is also used in the formulation of the vibration field, that is easily derived in the present approach. It allows one to easily identify the wave conversion of elastic waves at the ends of the shell. The present approach is used to predict the vibration field of the cylindrical shell with free-free boundary conditions. The contribution of each type of elastic waves into the vibration field was identified, and the wave conversion at the ends of the shell was observed. Those results showed that the present approach can be effectively used to analyze the forced vibration of the cylindrical shell from an elastic wave viewpoint.

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Theoretical Curve of Normalized Site Attenuation for Forced Resonant Type EMI Dipole Antennas (강제 공진형 EMI 다이폴 안테나에 대한 정규화 시험장 감쇠량 이론곡선)

  • 김기채
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.15 no.5
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    • pp.467-472
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    • 2004
  • This paper presents the normalized site attenuation characteristics for frequencies below 80 ㎒ using forced resonant type EMI dipole antennas. The coupled integral equations for unknown current distribution are solved by the Galerkin's method of moments with piecewise sinusoidal functions. The results show that the forced resonant type EMI dipole antenna for frequencies below 80 ㎒ can be used effectively for the measuring normalized site attenuation. The calculated normalized site attenuation curves for the forced resonant type EMI dipole antenna are useful in determining the suitability of open area test sites.