• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전력기술부문
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• pp.96-98
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• 2006

Recently major power outages are increased, because of transmission line fault by birds. Therefore, after finding out the problem of the current prevention measure for the super high voltage transmission Line in Korea and analyzing the protection measure of other foreign power companies for the transmission facilities fault by birds, this paper describes an effective device for power line fault protection by birds which has no legal problem and also protects birds. The described prevention measure of power outage by birds in this paper, has a special feature that is able to be installed on the current overhead transmission facilities without a replacement or change.

• Journal of the Korean Statistical Society
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• 제25권2호
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• pp.289-301
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• 1996

This paper suggests a new diagnostic measure for detecting influential observations in two group linear discriminant analysis(LDA). It is developed from an information theoretic point of view using the minimum discrimination information(MDI) methodology. MDI estimator of symmetric divergence by Kullback(l967) is taken as a measure of the power of discrimination in LDA. It is shown that the effect of an observation over the power of discrimination is fully explained by the diagnostic measure. Asymptotic distribution of the proposed measure is derived as a function of independent chi-squared and standard normal variables. By means of the distributions, a couple of methods are suggested for detecting the influential observations in LDA. Performance of the suggested methods are examined through a simulation study.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.1173-1176
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• 2007

The breaker noise is one of the main noise sources of construction site. It is very important to assess and measure the breaker noise accurately, because the noise labelling will be in effect January 2008 in Korea. Therefore, It is necessary to measure the sound power level of breakers and use a appropriate test method in accordance with international standard. In this study, we measure the sound power level of breakers by using the breaker noise measurement system. This system makes it possible to measure the breaker noise more accurately than to measure the noise of that attached with excavator, because this system can control main factors affecting breaker noise such as hydraulic input power, hydraulic supply pressure, breaker inlet oil flow and so on.

• 대한정형도수물리치료학회지
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• 제16권2호
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• pp.82-87
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• 2010

Purpose : This study was investigate The correlations between the Balance and the knee muscle power and the ankle muscle power. Methods : This studied selected 9cases of the healthy persons. Each measure of muscle power used Bio-dex pro-3. Balance measure was used balance-meter the ability to measure Ant-post, lateral, overall balance. Result : 1. Knee flexor and extensor causes ankles that plantar flexion strength and high correlation r= .745, r= .825 have, Ankle dorsi flexor strength and a bit of correlation r= .249, r= .221) have. 2. Ankle plantar flexor strength and overall balance and correlation was the r= .204, Ankle dorsi flexor strength and lat. balance and correlation was the r= .314. 3. Knee extensor strength and overall balance and correlation was the r=.212.

• 동력기계공학회지
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• 제21권4호
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• pp.51-56
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• 2017

The purpose of this study is to suggest economic analysis for piezoelectric power. Economic analysis method uses california standard test. Perspectives of california standard test is participant test, ratepayer impact measure test, program administrator cost test and total resource cost test. This study identifies the cost and benefit components. This study identifies benefit-cost calculation procedures from four test : participant test, ratepayer impact measure test, program administrator cost test and total resource cost test. In the economic analysis, the order of benefit cost ratio in piezoelectric power shows total resource cost test, program administrator cost test, ratepayer impact measure test and participant test.

• 소음진동
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• 제8권6호
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• pp.1137-1143
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• 1998

This paper describes the method to measure of the vibrational power transmitted from the vibration source to the supporting structure in the horizontal direction. Generally, it is impossible to measure horizontal forces at the coupling points. However. the vibrational Power transmitted in the horizontal direction can be measured by using indirect method that is based on the mechanical impedance and velocities at the coupling points. We proposed the method to estimate the vibrational power when the vibration source and supporting structure cannot be separated. In this paper. the vibrational power transmitted in the horizontal direction is also estimated by using this method. The estimated and measured results of the mobilities at the coupling point and vibrational power in the horizontal direction are compared. It is shown that the estimated results agree well with the measured results. For the supporting structure with multiple coupling points, the other coupling points should be considered for measuring the vibrational power transmitted through one coupling points. We examine the effects of other coupling points and measure the vibrational power without considering the other coupling points.

• 대한인간공학회지
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• 제29권5호
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• pp.741-750
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• 2010

The objective of this paper is to study if the EEG spectral relative power would be a reasonable measure of expertise level. EEG electrodes were placed on the locations of Fp1, Fp2, F3, F4, T3, T4, O1, O2 while 5 subjects were playing 4 kinds of game on PC. EEG spectral relative power was significantly related with expertise level on the locations of Fp1, T3, T4, O1, O2. And the results showed that the $\theta$ and $\alpha$ activities were decreased, while $\beta$ and $\gamma$ activities were increased. The results indicated that the EEG spectral relative power would be applicable as a quantitative measure of expertise level.

• 한국인터넷방송통신학회논문지
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• 제20권5호
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• pp.51-56
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• 2020

측정 명령어에 따른 정확도와 소요시간은 효율적인 Ka 밴드용 자동 시험 장비(ATE)를 구축하는데 중요한 요소이다. 이에 따라 본 논문에서는 RF 대표 계측기 Power Meter의 측정 명령어에 대해 연구하였다. 30 G ~ 31 GHz에서 Power Meter의 측정 명령어 FETCH와 MEASURE의 각 측정 레벨에 따른 정확도와 소요시간을 비교하였으며, -70 ~ +20 dBm 영역을 2가지 Power Sensor로 측정하였다. 측정 결과 신속하게 데이터를 불러오는 FETCH 명령어는 잡음 레벨보다 높은 선형 구간에서 비교적 정확한 데이터를 얻을 수 있었다. 가장 정확한 데이터를 얻을 수 있는 MEASURE 명령어는 FETCH 대비 시간이 많이 소요 되었으며, 최대 13.2초가 소요 되었다. 이를 통해 30 G ~ 31 GHz에서 Power Meter 측정 명령어의 정확도와 측정 소요시간을 확인할 수 있었고, 해당 연구 결과는 효율적인 Ka 밴드용 ATE를 구축하는데 기준을 제시할 수 있을 것으로 기대된다.

• 대한수학회지
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• 제45권2호
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• pp.587-596
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• 2008

For convex bodies, chord power integrals were introduced and studied in several papers (see [3], [6], [14], [15], etc.). The aim of this article is to study them further, that is, we establish the Brunn-Minkowski-type inequalities and get the upper bound for chord power integrals of convex bodies. Finally, we get the famous Zhang projection inequality as a corollary. Here, it is deserved to mention that we make use of a completely distinct method, that is using the theory of inclusion measure, to establish the inequality.

• 한국소음진동공학회논문집
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• 제21권12호
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• pp.1152-1158
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• 2011

In this paper a configuration of the load evaluation device for the tilting actuator using hydraulic power is presented, which makes it possible to measure the force action on the tilting actuator. It is possible to measure only current using the conventional electro-mechanical actuator when the bogie is in the process of the tilting. This makes impossible to measure the force acting on the tilting actuator. In order to overcome this problem a kinetic mechanism test system using hydraulic cylinder is proposed. The system are consisted of hydraulic cylinder for the tilting actuation, control system to control hydraulic power, sensors to measure for force and displacement and monitoring system for the user interface.