• 한국콘텐츠학회논문지
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• 제6권1호
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• pp.1-7
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• 2006

본 논문에서는 Orthogonal Frequency Division Multiplexing(OFDM) 시스템의 Peak-to-Average Power Ratio(PAPR) 성능을 향상시키기 위한 목적으로 Selective Mapping(SLM)과 Partial Transmit Sequence(PTS)기법을 결합하는 방식에 있어서, 늘어나는 계산량을 감소시키는 방법을 제안한다. PAPR의 감소효율을 높이고자 하는 많은 기법 중에 SLM과PTS기법에 관한 활발한 연구가 진행되어 왔을 뿐만 아니라, SLM과PTS을 결합한 기법에 관한 많은 연구가 진행되어 왔다. 결합기법에 있어서는, 복잡성이 크게 증가하는 문제가 존재하는데, 이러한 계산량의 복잡성을 줄이는 방법으로, 본 논문에서는 N-point IFFT 알고리즘을 도입한 SLM과 PTS 기법들로 결합된 새로운 시스템을 제안하였다. 이 방법은 SLM과 PTS와의 단순 결합에 비하여 시스템의 계산량의 복잡성을 감소시키는 결과를 가져다준다. 제안된 기법에서의 계산량의 감소는 N-Point IFFT의 과정에서 생성되는 n개의 단계 중의 최적의 결과를 내는 단계에서 위상 시퀀스와 부블럭 인덱스를 곱함으로써 계산의 복잡성을 낮추어 주는 과정을 통하여 이룬다. 제안된 알고리즘의 성능의 우수성은 시뮬레이션을 통하여 실험적인 부분을 나타냈으며, 또한 해석적인 방법을 통하여 계산량이 감소함을 보였다.

• Journal of Crop Science and Biotechnology
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• 제11권3호
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• pp.163-170
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• 2008

The detection, characterization and use of quantitative traits loci, QTL, have significant potential to improve the efficiency of selective breeding of species. Therefore, a population with 59 advanced backcross lines($BC_2F_5$), derived from a cross between IR64 and Tarome molaei, were studied in Tonekabon Rice Research Station of Iran in order to map QTLs for panicle length, number of grain per panicle, and panicle grain sterility in rice. The parental screening wtih 235 SSR markers in agarose and polyacrylamide gels revealed 114 markers with clear polymorphic bands. To search for QTLs associated with panicle length, number of grain per panicle, and panicle grain sterility, we constructed a genetic linkage map using 114 microsatellite markers. Positive and negative transgressive segregations were observed in $BC_2F_5$ lines for all traits. Using multiple interval mapping(MIM), a total of 20 putative QTLs were detected, of which eight were for panicle length, three for number of grains, and nine for panicle grain sterility. The maximum number of QTLs were mapped on chromosomes 1 and 2 with eight QTLs. These QTL markers could possible be utilized for marker-assisted selection.

• 디지털산업정보학회논문지
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• 제5권3호
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• pp.69-75
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• 2009

In this paper, we proposed CPLD low power algorithm using reduce glitch power consumption. Proposed algorithm generated a feasible cluster by circuit partition considering the CLB condition within CPLD. Glitch removal process using delay buffer insertion method for feasible cluster. Also, glitch removal process using same method between feasible clusters. The proposed method is examined by using benchmarks in SIS, it compared power consumption to a CLB-based CPLD low power technology mapping algorithm for trade-off and a low power circuit design using selective glitch removal method. The experiments results show reduction in the power consumption by 15% comparing with that of and 6% comparing with that of.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2006년도 춘계학술발표회 논문집
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• pp.151-158
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• 2006

As GPS 'selective availability' was turned off in 2000, GPS related fields and markets are explosively extended. In mapping area, GPS/INS aided photogrammetry proved it is much cost and time effective method keeping enough accuracy as compared with traditional photogrammetry works. The advantage of GPS/INS integration is interdependence. Even if GPS signal was blocked in some time, the position accuracy is not affected. In this study, various GPS signal time gap was used in GPS/INS AT process. Field surveyed ground points were used in accuracy check with GPS/INS AT check points. And the result showed enough accuracy of photogrammetry work rule of NGII. y.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 학술대회 논문집 전문대학교육위원
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• pp.70-73
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• 2007

Many methods have been developed to overcome the PAPR(peak-to-average power ratio) problem. Selective mapping(SLM) partial transmit sequence(PTS), subblock phase weighting(SPW) and gradient descent(GD) are used widely to reduce the PAPR. In this paper, we present a effective PAPR reduction method, decrease the calculation through Radix-2 DIF IFFT procedure and GD method. and can transmit selecting data sequence that satisfy threshold value as one part of proposed method, in case satisfy fixed threshold value, or transmit selecting data sequence with the lower papr operating remained part for performance improvement.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 D
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• pp.3007-3009
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• 2005

본 논문에서는 selective mapping(SLM)과 partial transmit sequence(PTS)기법을 결합하여 othogonal frequency division multiplexing(OFDM) 신호들의 peak-to-average power ratio(PAPR)감소 성능을 향상 시키며 SLM과 PTS기법의 결합으로 인한 증가된 복잡성을 inverse fast Fourier transform(IFFT)의 어떤 중간 단계 이후 위상 시퀀스를 곱함으로써 낮추었다. 이와 같이 새로운 알고리듬을 제안하고 제안한 기법과 기존의 SLM과 PTS 기법의 PAPR 감소 성능을 simulation을 통하여 비교, 분석하였다.

• Asian Journal of Innovation and Policy
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• 제5권2호
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• pp.116-128
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• 2016

Value chain analysis has been applied in various fields, from the time the concept of “value chain” was introduced by Porter in 1985. Several frameworks have emerged and have been used to study individual firms, entire industries, industry clusters, as well as global production networks. The purpose of this paper is to provide a brief review of these frameworks, identify factors that influence the performance of value chains, and suggest areas for future research. Since there is a wide range of value chain literature, this paper focuses on a selective set of earlier works within the value chain model as conceptualized by Porter. The study takes note of the many dimensions and applications of value chain analysis, and shows that value chain analysis is an effective way to examine the interaction among different players in a given industry. The study further points out the shortcomings of the traditional or Porter view of value chain analysis.

• 소음진동
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• 제7권2호
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• pp.255-260
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• 1997

This paper describes 3-dimensional volume array of 4 microphones including a reference microphone which is capable of imaging wideband noise source position in 2-dimensional image plane. The cross correlation function and corresponding imaging function between a reference microphone and other microphone, are derived as a function of noise source position. The magnitude of the imaging function gives noise source mapping in image plane. Since the image plane is selective from a rectangular and a cylindrical plane, noise source position information such as range and bearing relative to the array is identified very much easily. Simulation results for typical source configurations confirms the applicability of the proposed array in noise control field.

• 대한전기학회논문지
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• 제39권9호
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• pp.985-996
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• 1990

An inverse kinematic solution of a robot manipulator using multilayer perceptrons is proposed. Neural networks allow the solution of some complex nonlinear equations such as the inverse kinematics of a robot manipulator without the need for its model. However, the back-propagation (BP) learning rule for multilayer perceptrons has the major limitation of being too slow in learning to be practical. In this paper, a new algorithm named Dynamically Reconfiguring BP is proposed to improve its learning speed. It uses a modified version of Kohonen's Self-Organizing Feature Map (SOFM) to partition the input space and for each input point, select a subset of the hidden processing elements or neurons. A subset of the original network results from these selected neuron which learns the desired mapping for this small input region. It is this selective property that accelerates convergence as well as enhances resolution. This network was used to learn the parity function and further, to solve the inverse kinematic problem of a robot manipulator. The results demonstrate faster learning than the BP network.

• 한국조경학회지
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• 제27권5호
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• pp.130-137
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• 2000

New Seoul Town is a new town in Seoul Mapo-Gu, Which is planed by Seoul metropolitan government. There are Nanji Waste reclaimed land and Seoul world-cup stadium, which is under construction in the new town. This study is executed for urban nature conservation by assessing the biotope in the new town. The biotope map is mae by the selective mapping method, and assessing the biotope is executed by a quick method, which is originated with R. Wittig and Scheriber(1983). The assessment criteria include the period of development, area, rarity and variety of habitat condition. In the result from this study, biotope type of the new town is classified eight types, and all biotope type is valuable for nature conservation. The reason of this result is because of little natural area which is rice field, farm field, forest, swampy land, etc, except New Seoul Town, in Seoul Mapo-Gu. And so, Biotope in New A Seoul Town, must be conserved and restored in new town urban planning.