• 제목/요약/키워드: distribution configuration

검색결과 783건 처리시간 0.025초

랜덤-반전 분산 맵으로 설계된 분산 제어 링크를 갖는 MSSI 시스템 (MSSI System with Dispersion-managed Link Configured with Random-inverse Dispersion Maps)

  • 이성렬
    • 한국항행학회논문지
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    • 제27권4호
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    • pp.457-462
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    • 2023
  • 파장 분할 다중 신호와 같은 대용량 광 신호를 장거리 전송하기 위하여 사용되는 MSSI (mid-span spectral inversion)와 분산 제어가 결합된 시스템에서의 융통적인 링크 구성을 제안하고 색 분산과 비선형 왜곡 보상 효과를 높일 수 있는 구체적 방법을 살펴보았다. 분산 제어 링크 구성의 융통성을 높이기 위해 제안된 분산 맵은 'random-inverse' 구조를 갖는다. 즉 광 위상 공액기까지의 전반 구획의 각 광성유 스팬의 RDPS는 랜덤하게 분포되고 후반 구획의 RDPS 분포는 전반 구획의 분포 패턴을 반전하는 구성의 분산 맵이다. 제안된 분산 맵은 RDPS의 랜덤 분포를 가지기는 하지만 결과적으로 광 위상 공액기를 중심으로 분산 프로파일이 대칭이 되는 점에 기인하여 왜곡 보상 효과가 개선되는 것을 확인하였다. 'random-inverse' 구조의 분산 맵에서 각 광섬유 스팬에 할당되는 RDPS의 크기가 큰 경우에서왜곡된 파장 분할 다중 신호의 보상 효과가 더욱커지는 것도 동시에 확인하였다.

알루미늄 평행류 열교환기 헤더 내 냉매 분배에 관한 연구 (A Study on the Refrigerant Distribution in an Aluminum Parallel Flow Heat Exchanger Header)

  • 김도영;김내현;김수환;변호원;이을종
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2009년도 하계학술발표대회 논문집
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    • pp.1123-1128
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    • 2009
  • The refrigerant R-134a flow distributions are experimentally studied for a round header/ten flat tube test section simulating a brazed aluminum heat exchanger. Three different inlet orientations (parallel, normal, vertical) were investigated. Tests were conducted with downward flow for the mass flux from 70 to $130\;kg/m^2s$ and quality from 0.2 to 0.6. In the test section, tubes were flush-mounted with no protrusion into the header. It is shown that normal and vertical inlet yielded approximately similar flow distribution. At high mass fluxes or high qualities, however, slightly better results were obtained for normal inlet configuration. The flow distribution was worst for the parallel inlet configuration. Possible explanation is provided based on flow visualization results.

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접지방식이 상이한 철도배전계통의 연장급전을 위한 전기적 특성분석 (Analysis of electric characteristics for extension power supply between different grounding railway distribution system)

  • 정호성;한문섭;이장무;권삼영;박현준
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2005년도 추계학술대회 논문집
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    • pp.736-741
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    • 2005
  • This paper presents electric characteristics analysis and safe configuration for extension power supply between existent 6.6kV ungrounded distribution system and establishment and improvement 22.9kV direct grounding distribution system. For this, we model 6.6kV ungrounded and 22.9kV direct grounding distribution system of urban underground, ground region. and rural electrical, unelectrical region using PSCAD/EMTDC and analyze voltage drop, charging current, ground and short fault through simulation. To analyze electric characteristics of extension power supply, we simulate extension power supply of overhead line of 6.6kV ungrounded system and underground line of 22.9kV direct grounding system of rural electrical region and propose operation condition for safe extension power supply through result of analysis. Characteristics of voltage drop, charging current, ground and short fault appear almost similarly with electrical characteristic of direct power supply. However, because unbalance of phases may cause relay's malfunction of ungrounded system and ground fault current of direct grounding system may demage facilities of ungrounded system, we propose safe system configuration such as impedance grounding system of neutral point.

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사업체 기초통계조사에서 산업활동의 공간집적도 측정 연구 (A Study on the Measurement of Industry Agglomeration for the Census on Basic Characteristics of Establishments)

  • 김윤수;정연수;김병천
    • 응용통계연구
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    • 제17권1호
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    • pp.13-26
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    • 2004
  • 경제성장이론에 의하면 특정 산업에 종사하는 사업체들의 입지 행태는 업종별로 서로 공간적 관련성을 갖는다. 본 연구에서는 음이항분포의 산포모수의 특성을 이용하여 산업 활동의 공간집적도를 계량화하기 위한 산업집중지수를 정의하고 이를 이용하여 특정업종에 종사하는 사업체들의 입지행태에 있어서 공간적 변화경향을 통계적으로 규명하고자 하였다. 1995년도와 2000년도의 사업체 기초통계조사 자료를 이용하여 충북지역의 지식기반산업 7개 업종과 주력기간산업 9개 업종에 대해 산업집중지수를 추정하여 이를 기반으로 업종별 사업체들의 공간적 입지행태 변화경향을 분석하였고 지역산업 활성화에 필요한 업종의 선택 및 집중화문제해결에 산업집중지수가 활용될 수 있음을 보였다.

다변량해석에 의한 박물관 전시공간의 그룹별 분포특성 - 정량적 분석지표의 설정과 주성분분석을 중심으로 - (A Study on the Distribution Specific Characteristics about Each Group of Exhibition Space on Museum through Multivariate Analysis - Focused on Establishment of Quantitative Analysis Characteristics and Main Component Analysis -)

  • 박무호;조재욱;임채진
    • 한국실내디자인학회논문집
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    • 제13권6호
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    • pp.132-139
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    • 2004
  • This study is to a question in argument that existing theses about a trait spatial configuration of exhibition space were analyzed without appropriateness verification of analysis characteristics. Firstly, through theoretical studies of established thesis, validity twenty analysis characteristics was chosen by making an investigation into existing analysis characteristics. Secondly, through a subject of our investigation, forty-two exhibition space of nineteen museums and art museum at home and abroad, a distribution map of exhibition space was analyzed by multivariate analysis. As a result of this study : 1) Nine analysis characteristics which extracted through multivariate analysis was the principal analysis characteristics. 2) A scale was important characteristic for the classification of museum therefore a degree of space perception was ought to compare every one of similar scale museum. 3) When comparing a trait of spatial configuration at exhibition space, these characteristics came into effect on middle sized museums. 4) It was visually confirmed a trait of spatial configuration of each group between museum and art museum

유한장 직선도체에 의한 자계의 계산 및 감소대책 (Calculation and Mitigation of Magnetic Field Produced by Straight Line-Conductor with Finite Length)

  • 강대하
    • 조명전기설비학회논문지
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    • 제25권6호
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    • pp.57-67
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    • 2011
  • Purpose of this study is to find the mitigation method of magnetic field by finite length multi-conductors such as indoor distribution lines and to be applicable to design of the distribution lines. For this purpose, exact formula about the components $B_x$, $B_y$, $B_z$ of magnetic field need in case of straight line-conductor with finite length forward any direction. In this study simple formula of the components were deduced and by using these formula magnetic fields for various models of line-configurations were calculated. And also a calculation method of induced currents in conductive shield was presented and using this method, programing of calculation is relatively easy and calculation time is short. The magnetic field after cancellation by these induced currents was calculated. All of calculations were performed by Matlab 7.0 programs. Through the calculation results it could be obtained followings for the mitigation of magnetic fields. The separation between conductors ought to be smaller than smaller as possible. In case of 3-phase, delta configuration is more effective than flat configuration. In case of 3-phase, unbalanced currents ought to be reduced as possible.. In case of more than two circuits of 3-phase, adequate locations of each phase-conductor such as rotating configuration of 3-phase conductors are more effective. The magnetic shielding effect of the conductive shielding sheet is very high.

DISPARITY ESTIMATION/COMPENSATION OF MULTIPLE BASELINED STEREOGRAM USING MAXIMUM A POSTERIORI ALGORITHM

  • Sang-Hwa;Park, Jong-Il;Lee, Choong-Woong
    • 한국방송∙미디어공학회:학술대회논문집
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    • 한국방송공학회 1999년도 KOBA 방송기술 워크샵 KOBA Broadcasting Technology Workshop
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    • pp.49-56
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    • 1999
  • In this paper, the general formula of disparity estimation based on Bayesian Maximum A Posteriori (MAP) algorithm is derived. The generalized formula is implemented with the plane configuration model and applied to multiple baselined stereograms. The probabilistic plane configuration model consists of independence and similarity among the neighboring disparities in the configuration. The independence probabilistic model reduces the computation and guarantees the discontinuity at the object boundary region. The similarity model preserves the continuity or the high correlation of disparity distribution. In addition, we propose a hierarchical scheme of disparity compensation in the application to multiple-view stereo images. According to the experiments, the derived formula and the proposed estimation algorithm outperformed other ones. The proposed probabilistic models are reasonable and approximate the pure joint probability distribution very well with decreasing the computations to O(n(D)) from O(n(D)4) of the generalized formula. And, the hierarchical scheme of disparity compensation with multiple-view stereos improves the performance without any additional overhead to the decoder.

커피전문점의 VMD 구성요인이 브랜드자산과 재구매의도에 미치는 영향 (An Influence of VMD configuration factors of Coffee shops on Brand equity and Repurchase intention)

  • 김상수;송인암;황희중
    • 유통과학연구
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    • 제10권11호
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    • pp.39-53
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    • 2012
  • Purpose - This study identifies relationships amongst repurchase intentions, brand equity, and preference by applying VMD of fashion retail stores. The results would help coffee shop owners and coffee makers in devising an appropriate strategy for successfully managing coffee shops. Research design, data, methodology - The VMD model of a coffee shop includes harmony, trend, and attractiveness, while brand equity encompasses brand awareness, perceived quality, and brand image. In this study, the VMD factors of coffee shops, brand equity, and brand preference, are shown as independent variables, while repurchase intention is shown as the dependent variable. The study aims to ascertain the extent of the influence configuration factors of a coffee shop have on brand equity, brand preference, and repurchase intention. Regression analysis was used to verify the mediating effects of brand preference on brand equity and repurchase intention. The measurement items were already deemed as reliable and valid in the previous study, but some modifications were made for the purposes of this study. Questionnaires were distributed to 550 consumers on a national scale, and 517 consumers amongst these were finally used as a sample for analysis using the SPSS 17.0 statistical program. Results - First, amongst the VMD configuration factors of a coffee shop, trend, and attractiveness have a positive impact on brand equity (brand awareness, perceived quality, and brand image). Second, brand equity has a positive effect on brand preference. Third, brand preference has a positive effect on repurchase intention. Fourth, brand preference plays the role of a mediator in measuring the impact of brand awareness and brand image on customers' repurchase intentions. Conclusions - The theoretical implications can be summarized as follows. First, this study proposes a theoretical basis that can be adapted to the VMD configuration factors of a coffee shop by identifying the relationship between brand equity and coffee shops. This study applies the VMD factors to the coffee shops and presents a new research model by examining the relationships amongst VMD components of coffee shops: brand equity, brand preference, and repurchase intention. Second, it clearly establishes the relationship between brand equity and brand preference by identifying the mediating effects of brand preference, given that brand equity has a positive impact on repurchase intention. The practical implications are as follows. First, development of brand equity and management can be important components for coffee shops in determining that the VMD configuration factors of coffee shops have an impact on brand equity. Second, amongst the VMD configuration factors, attractiveness and trend have a positive influence on choosing coffee shops, therefore store atmosphere should be attractively designed, while the menu and interiors should complement each other and be reviewed periodically to conform to the latest trend. Third, VMD configuration factors that are confirmed are not easily changed. Fourth, large franchises and foreign companies have strengths in scale, locations, and brand. Fifth, the different ways of campaigning should be compared to those of large franchises and foreign companies in order to increase brand equity using VMD configuration factors.

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Configuration design of the trainset of a high-speed train using neural networks

  • Lee, Jangyong;Soonhung Han
    • 한국지능정보시스템학회:학술대회논문집
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    • 한국지능정보시스템학회 2001년도 The Pacific Aisan Confrence On Intelligent Systems 2001
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    • pp.116-121
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    • 2001
  • Prediction of the top(service) speeds of high-speed trains and configuration design to trainset of them has been studied using the neural network system The traction system. The traction system of high-speed trains is composed of transformers, motor blocks, and traction motors of which locations and number in the trainset formation should be determine in the early stage of train conceptural design. Components of the traction system are the heaviest parts in a train so that it gives strong influence to the top speeds of high-speed trains. Prediction of the top speeds has been performed mainly with data associated with the traction system based on the frequently used neural network system-backpropagation. The neural network has been trained with the data of the high-speed trains such as TGV, ICE, and Shinkanse. Configuration design of the trainset determines the number of trains motor cars, traction motors, weights and power of trains. Configuration results from the neural network are more accurate if neural networks is trained with data of the same type of trains will be designed.

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유로 형상 변화에 따른 CFD 해석 결과와 PEM 연료전지 성능 비교 (Comparison between CFD analysis and experiments according to various PEMFC flow-field designs)

  • 이강인;박민수;이세원;주종남
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2008년도 춘계학술대회 논문집
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    • pp.572-575
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    • 2008
  • Flow-field design has much influence over the performance of proton exchange membrane fuel cell (PEMFC) because it affects the pressure magnitude and distribution of the reactant gases. To obtain the pressure magnitude and distribution of reactant gases in four kinds of flow-field designs without additional measurement equipment, computational fluid dynamics (CFD) analysis was performed. After the CFD analysis, the performance values of PEMFC according to the flow-field configurations were measured via a single cell test. As expected, the pressure differences due to different flow-field configurations were related to the PEMFC performance because the actual performance results showed the same tendency as the results of the CFD analysis. A large pressure drop resulted in high PEMFC performance. So, the single serpentine configuration gave the highest performance. On the other hand, the parallel flow-field configuration gave the lowest performance because the pressure difference between inlet and outlet was the lowest.

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