• 한국자동차공학회논문집
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• 제11권4호
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• pp.165-172
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• 2003

This study aims to find frequency weighting curves for the evaluation of drivers' discomfort by vertical and rotational steering wheel vibration. Equal sensation curves, inverse of frequency weighting curves, were determined for the two kinds of vibrations respectively by using the sinusoidal signals with reference amplitudes from 0.2 to 0.4 m/s2 in the frequency range from 5 to 100 ㎐. Twelve subjects joined at the tests, and median values of the twelve judgments were used to determine the equal sensation curves. An experiment was followed to compare the relative sensation magnitude between the two kinds of equal sensation curves, which showed discomfort by the rotational vibration was 1.5 times of that by the vertical vibration at 50 ㎐.

• 대한토목학회논문집
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• 제32권6D호
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• pp.533-538
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• 2012

교통관리 전략의 우선순위 설정의 목적은 시행단계에서 전략목표를 계획적이고 균형 있게 달성하는 것이다. 조직의 관점 및 전략목표를 도출하고 가중치를 부여하기 위한 방법으로 AHP 기법을 주로 사용한다. 본 연구에서는 국내 특정 교통관리 기관을 대상으로 설문조사방법과 임직원 설문 방식을 활용하여 관점과 전략목표를 도출하였다. 그 후, 관점 및 전략목표의 우선순위를 AHP 기법을 통해 설정하였다. 본 연구를 통해 세 가지 결과를 얻을 수 있었다. 첫째, 국내 특정교통관리기관의 관점에 대한 가중치는 고객, 미래, 활동, 성과의 순서를 나타내었다. 이는 이 기관의 임직원이 고객에 대해 가치 체계를 두고 있음을 보여준다. 둘째, 전략목표 중 고객 중심적 사고의 증대와 친환경가치 체계 확립의 가중치가 가장 높았다. 셋째, 근무지별로 살펴보면 본사와 지역본부는 고객 중심적 사고의 증대를 가장 중요시하였다. 반면 지사는 친환경 가치체계 확립을 가장 중요시하고 있다. 이 결과로 본사 지역본부와 지사는 가치체계에 차이를 갖고 있음을 알 수 있다. 결과적으로 교통관리전략 수립 시 교통관리전략의 주요 관점과 그에 따른 전략들을 우선순위에 맞게 적용할 수 있었다.

• 농촌계획
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• 제13권2호
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• pp.7-16
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• 2007

This study aims to develop an evaluation method of green-tourism potential in village level with amenity resources of rural villages, considering human resources of the village. The amenity resources evaluation system was classified into three sub-classes with social, industrial, and natural resources. The system consisted of a relationship diagram between three classes resources and tourists' behavior. The new methodology considers human resources as a key factor for green-tourism potential evaluation of villages, including the amenity resources of three sub-classes. In quantitative method for the criteria, this study adopted a new method of continuous linear score method, which is applying fuzzy theory, not to give score with the existing discrete scoring method with several steps. The weighting values of the evaluation criteria were calculated from the step wise pair-comparision results by AHP(Analytic Hierachy Process) method, which industrial, natural, and social resources have relative weighting values of 523/1000, 319/1000, and 158/1000, respectively. In evaluation of another weighting value by the same methodology, the results showed that the amenity and the human resources have weighting values of 627/100 and 373/1000, respectively. The new evaluation method was applied to make the potential evaluation for rural villages of the study area, which located on Narial-myun, Keumsan-gun, Chungnam province. The development priority among the villages could be suggested reasonably by the new findings of this study, according to the evaluation results showing that the village with high possibility for development in green-tourism has high score in the potential evaluation.

• 한국인터넷방송통신학회논문지
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• 제13권4호
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• pp.127-133
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• 2013

본 논문에서는 통신 채널에서 발생되는 부호간 간섭의 영향을 최소화하기 위하여 사용되는CCA 적응 등화 알고리즘에서 compact slice 가중치에 따른 성능을 비교하였다. CCA 알고리즘은 기존의 결정 지향 알고리즘 (DDA : Decision Directed Algorithm)과 축소 신호점 알고리즘 (RCA : Reduced Constellation Algorithm)의 결합 방식으로 송신 신호의 constant modulus와 결정 장치의 출력 신호를 compact slice 가중치만큼 고려하여 초기의 수렴 특성 및 정상 상태에서 misadjustment에 의한 등화 잡음을 개선시킬 수 있다. 이 과정에서 compact slice 가중치가 적응 등화 알고리즘의 성능에 미치는 영향을 컴퓨터 시뮬레이션을 통해 확인하며, 성능 지수로는 등화기 출력 신호 성상도, 수렴 특성을 나타내는 잔류 isi, 최대 찌그러짐, MSE 및 채널의 신호대 잡음비에 따른 SER을 사용하였다. 시뮬레이션 결과 가중치가 클수록 모든 성능 지수에서 우월하였고, 특히 SER 성능에서는 신호대 잡음비가 적으면 가중치가 적을때가 우월하였고 신호대 잡음비가 클수록 가중치가 클때가 우월함을 알 수 있었다.

• 한국인터넷방송통신학회논문지
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• 제13권3호
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• pp.55-61
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• 2013

본 논문에서는 통신 채널에서 발생되는 찌그러짐과 잡음의 영향을 최소화하기 위하여 사용되는 S-MMA 적응 등화 알고리즘에서 Slice 가중치에 따른 성능을 비교하였다. 기존의 MMA 알고리즘에서는 등화기의 출력 신호와 송신 신호의 dispersion 상수만을 이용하지만, S-MMA에서는 등화기 출력 신호와 dispersion 상수외에 결정 장치의 출력 신호를 slice 상수만큼 고려하여 채널의 진폭과 위상 찌그러짐을 동시에 보상할 수 있다. 이때 slice 가중치가 적응 등화 알고리즘의 성능에 미치는 영향을 컴퓨터 시뮬레이션을 통해 확인하며, 성능 지수로는 등화기 출력 신호 성상도, 수렴 특성을 나타내는 잔류 isi, 최대 찌그러짐, MSE와 채널의 신호대 잡음비에 따른 SER을 사용하였다. 시뮬레이션 결과 slice 가중치가 적으면 잔류isi, 최대 찌그러짐과 MSE 성능이 우월하며, 가중치가 큰 경우 SER 성능이 우월함을 확인하였다.

• 한국소음진동공학회논문집
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• 제16권6호
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• pp.658-664
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• 2006

Shock vibrations are usually experienced in vehicles excited by impulsive input, such as bumps. The frequency weighting functions of the current standards in ISO 2631 and BS 6841 are to help objectively predict the amount of discomfort of stationary vibration. This experimental study was designed to develop frequency weighting shape for shock vibration having various fundamental frequencies from 0.5 to 16Hz. The specks were produced from the response of single. degree-of-freedom model to a half-sine force input. Fifteen subjects used the magnitude estimation method to judge the discomfort of vertical shock vibration generated on the rigid seat mounted on the simulator. The magnitudes of the shocks, expressed in terms of both peak-to-peak value and un-weighted vibration dose values (VDVs) , were correlated with magnitude estimates of the discomfort. The frequency weighting shapes from the correlation were developed and investigated having nonlinearity due to the magnitude of the shock.

• 제어로봇시스템학회논문지
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• 제12궈1호
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• pp.41-46
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• 2006

Ubiquitous location based services, offer helpful services anytime and anywhere by using real-time location information of objects based on ubiquitous network. Particularly, autonomous mobile robots can be a solution for various applications related to ubiquitous location based services, e.g. in hospitals, for cleaning, at airports or railway stations. However, a meaningful and still unsolved problem for most applications is to develop a robust and cheap positioning system. A typical example of position measurements is dead reckoning that is well known for providing a good short-term accuracy, being inexpensive and allowing very high sampling rates. However, the measurement always has some accumulated errors because the fundamental idea of dead reckoning is the integration of incremental motion information over time. The other hand, a localization system using RFID offers absolute position of robots regardless of elapsed time. We construct an absolute positioning system based on RFID and investigate how localization technique can be enhanced by RFID through experiment to measure the location of a mobile robot. Tags are placed on the floor at 5cm intervals in the shape of square in an arbitrary space and the accuracy of position measurement is investigated . To reduce the error and the variation of error, a weighting function based on Gaussian function is used. Different weighting values are applied to position data of tags since weighting values follow Gaussian function.

• 한국통계학회:학술대회논문집
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• 한국통계학회 2000년도 추계학술발표회 논문집
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• pp.241-246
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• 2000

A simple random sample is taken from a population and a particular survey item is subject to nonresponse that corresponds to random subsampling of the sampled values within adjustment cells. Our object is to estimate Bayesian probability interval of the population mean.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1989년도 한국자동제어학술회의논문집; Seoul, Korea; 27-28 Oct. 1989
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• pp.884-889
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• 1989

In this paper, a new procedure for selecting weighting matrices in linear discrete time quadratic optimal control problem (LQ-problem) is proposed. In LQ-problems, the quadratic weighting matrices are usually decided on trial and error in order to get a good response. But using the proposed method, the quadratic weights are decided in such a way that all poles of the closed loop system are located in a desired region for good responses as well as for stability and values of the quadratic cost function are kept less then a specified value.

• 한국농공학회지
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• 제44권1호
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• pp.69-80
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• 2002

This study aims to develop a potential centrality evaluation model (PCEM) which can evaluate the potential centrality of villages within the catchment boundaries. PCEM is a tool for evaluation of villages\` centralities by the potential centrality index (PCI) developed in this study. For quantification of PCI, total 31 evaluation criteria on the accessibility to other villages and the natural and human environment of the village were introduced. The weighting values of criteria were calculated from the step wise pair-comparision results of 14 specialists in academic fields on rural planning using by AHP (Analytic Hierachy Process) of MCE (multi-criteria evaluation) method. In the results, the weighting values of the spatial accessibility, the natural environments and the human environments were 448, 338 and 214, respectively, among total value being 1,000.