• Title/Summary/Keyword: Tracing method

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A Study on the Calculation of Overshadowing Area by Ray-Tracing Method (Ray-Tracing Method를 이용한 일영면적 산정방식 고찰)

  • Choi, Jeong-Min;Cho, Sung-Woo
    • Journal of the Korean Solar Energy Society
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    • v.31 no.3
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    • pp.36-41
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    • 2011
  • Nowadays, the solar expose right is very important with people's life. Therefore, in calculating the sunshine hours, the point analysis and area analysis methods are used in previous studies. Previous two methods have merits and faults. Therefore, ray-tracing method is used as a alternative. Ray-tracing method is adopted by the software of Autodesk Ecotect which is a widely used program by the architectural company and academic university. In this study first, ray-tracing methodology is studied with how to calculate the overshadowing area and, secondly, the sensitivity of the two major factors, overshadowing accuracy and sky subdivision, is analyzed. With these results, appropriate application of the ray-tracing method is presented.

A Guideline Tracing Technique Based on a Virtual Tracing Wheel for Effective Navigation of Vision-based AGVs (비전 기반 무인반송차의 효과적인 운행을 위한 가상추적륜 기반 유도선 추적 기법)

  • Kim, Minhwan;Byun, Sungmin
    • Journal of Korea Multimedia Society
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    • v.19 no.3
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    • pp.539-547
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    • 2016
  • Automated guided vehicles (AGVs) are widely used in industry. Several types of vision-based AGVs have been studied in order to reduce cost of infrastructure building at floor of workspace and to increase flexibility of changing the navigation path layout. A practical vision-based guideline tracing method is proposed in this paper. A virtual tracing wheel is introduced and adopted in this method, which enables a vision-based AGV to trace a guideline in diverse ways. This method is also useful for preventing damage of the guideline by enforcing the real steering wheel of the AGV not to move on the guideline. Usefulness of the virtual tracing wheel is analyzed through computer simulations. Several navigation tests with a commercial AGV were also performed on a usual guideline layout and we confirmed that the virtual tracing wheel based tracing method could work practically well.

Back Tracing Calculation Method for the Leakage Detection in Water Distribution System (상수관망에서 누수탐지를 위한 역추적계산법)

  • Kwon, Hyuk Jae
    • Journal of Korean Society of Water and Wastewater
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    • v.27 no.5
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    • pp.611-619
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    • 2013
  • In this study, Back Tracing Calculation Method was developed to determine the leakage location and leakage amount. Previously developed determination method of monitoring location and newly developed Back Tracing Calculation Method were applied to the sample pipe network and real size pilot plant. After leakage was assumed in the pilot plant, leakage location and leakage amount could be traced by Back Tracing Calculation Method. From the results, it was found that Back Tracing Calculation Method can be applied for the leakage detection in water distribution system. Furthermore, this method can be applied for the pressure management or leakage detection as a pressure control method in water distribution system.

Development of Received Acoustic Pressure Analysis Program of CHA using Beam Tracing Method (Beam Tracing 기법을 이용한 수동 소나 센서의 수신 음압해석 프로그램 개발)

  • Kwon, Hyun-Wung;Hong, Suk-Yoon;Song, Jee-Hun;Jeon, Jae Jin;Seo, Young-Soo
    • Journal of the Society of Naval Architects of Korea
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    • v.50 no.3
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    • pp.190-198
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    • 2013
  • In order to predict acoustic pressure distributions by exterior incident wave at Cylindrical Hydrophone Array (CHA) sensor's positions, acoustic pressure analysis is performed by using beam tracing method. Beam tracing method is well-known of reliable pressure analysis methods at high-frequency range. When an acoustic noise source is located at the center of rectangular room, acoustic pressure analysis is performed by using both beam tracing method and Power Flow Boundary Element Method (PFBEM). By comparing with results of beam tracing method and those of PFBEM, the accuracy of beam tracing method is verified. We develop the CHA pressure analysis program by verified beam tracing method. The developed software is composed of model input, sensor array creator, analysis option, solver and post-processor. We can choose a model option of 2D or 3D. The sensor array generator is connected to a sonar which is composed of center position, bottom, top and angle between sensors. We also can choose an analysis option such as analysis frequency, beam number, reflect number, etc. The solver module calculates the ray paths, acoustic pressure and result of generating beams. We apply the program to 2D and 3D CHA models, and their results are reliable.

Outdoor Noise Prooagation : Sound Tracing Algorithm (옥외 소음의 전파 : 음 추적 알고리즘)

  • 박지헌;김정태
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.05a
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    • pp.439-444
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    • 2001
  • We provide methods to simulate noise propagation for an outdoor environment. Forward tracing method traces sound vectors from sources to receivers while geometry based computation finds all possible sound propagation between sources and receivers geometrically. We discuss defects in relying on a forward tracing method, and suggest a geometry based method. Geometry based method considers all possible direct and indirect(propagation via limited number of reflections) sound propagation saving computational time compared to forward sound tracing. Our simulation results are visualized using VRML(Virtual Reality Modeling Language).

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Aspherical Lens Design by using Ray Reverse Tracing Method (광선 역추적 방식을 이용한 비구면 렌즈의 설계)

  • Kim, Han-Seob;Park, Kyu-Yeol
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.992-997
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    • 2003
  • Aspherical lens design method named ray reverse tracing method is introduced. Differently from the traditional design method, the ray reverse tracing method traces the shape and location of a real object by use of its virtual image. From the result, it was convinced that spherical aberration free aspherical lens could be designed by use of the ray reverse tracing method. Furthermore, it could reduce the degree of dependence of optical characteristics on designer's ability, because deformation terms and optimization can be eliminated, which has been performed in conventional lens design process.

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Design of Spherical Aberration Free Aspherical Lens by Use of Ray Reverse Tracing Method (광선 역추적 방식을 이용한 구면수차 제거 비구면 렌즈의 설계)

  • 김한섭;박규열;이원규;전종업
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.10
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    • pp.191-198
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    • 2003
  • In this study, aberration free aspherical lens design method named ray reverse tracing method is introduced. Differently from the traditional design method, the ray reverse tracing method traces the shape and location of a real object by use of its virtual image. From the result, especially spherical aberration free aspherical lens could be designed by use of the ray reverse tracing method. Furthermore, it could reduce the degree of dependence of optical characteristics on designer's ability, because deformation terms and optimization can be eliminated, which has been performed in conventional lens design process.

Power Tracing Method for Transmission Usage Allocation Considering Reactive Power

  • Han Choong-Kyo;Park Jong-Keun;Jung Hae-Sung
    • KIEE International Transactions on Power Engineering
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    • v.5A no.1
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    • pp.79-84
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    • 2005
  • In many countries, the electric power industry is undergoing significant changes known as deregulation and restructuring. These alterations introduce competition in generation and retail and require open access to the transmission network. The competition of the electric power industry causes many issues to surface. Among them, unbundling of the transmission service is probably the most complicated as it is a single and integrated sector and the transmission revenue requirement must be allocated to market participants in a fair way. In these situations, it is valuable to research the methodologies to allocate transmission usage. The power tracing method offers useful information such as which generators supply a particular load or how much each generator (load) uses a particular transmission line. With this information, we can allocate required transmission revenue to market participants. Recently, several algorithms were proposed for tracing power flow but there is no dominant power tracing method. This paper proposes a power tracing method based on graph theory and complex-current distribution. For practicability, the proposed method for transmission usage allocation is applied to IEEE 30 buses and compared with the method proposed by Felix F.Wu.

Design of Aspheric Lens by using Ray Tracing Method (광선추적방식을 적용한 비구면 렌즈 설계)

  • Kim, Soo-Yong;Han, Min-Sik;Kim, Tae-Ho;Park, Jung-Woo;Kim, Min-Ju;Jeon, Eon-Chan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.6 no.1
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    • pp.7-12
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    • 2007
  • The optic industry is a high value-added advanced technology industry combined with the precision machine industry and the digital electronics industry. The aspheric lens, one of optic parts, is a key technology having a significant influence on the performance of optic equipment. So this study relates to designing an aspheric lens to which a ray-tracing method is applied. In the ray-tracing method, a refractive index of material is used, which take an advantage that the location of a light source and incident angle can be fixed, unlike the ray back-tracing scheme.

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A Method of Power Transmission Pricing using Power Flow Tracing (전력조류 추적법을 이용한 송전요금 산정법)

  • Ro, Kyoung-Soo
    • Proceedings of the KIEE Conference
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    • 2001.11b
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    • pp.424-428
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    • 2001
  • The methodologies of power transmission pricing are normally divided into two categories such as marginal cost method and embedded cost allocation method. This paper, first, discusses the possible problems that can occur when the marginal cost method is applied to pricing the transmission services. Next, the paper proposes a method to apply the power flow tracing to the transmission network charge. The result of the power flow tracing method is then used in MW-mile method to charge individual loads for the use of transmission network. Effectiveness of the algorithm is verified by computer simulations.

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