• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.1559-1565
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• 2004

Railway system is consisted of various resources such as rail-line, signal, and railcar. It is necessary to efficiently utilize these limited and expensive resources as much as possible up to given line capacity. So far, we treat the line capacity as the criteria for evaluating investment alternatives or for restricting train frequencies, and this criteria is calculated statical and experimental numerical formula. But, line capacity has special attribute that changes dynamically according to operational conditions, so there is a need of new line capacity estimation system. In this paper, we present an improved systematic line capacity model. The proposed model has three main components ; TPS(tain performance simulator), PES (parameter evaluation simulator), LCS(line capacity simulator). The concept of each sub-component is described, including the evaluation method of capacity parameters. And capacity parameter evaluation and estimation results using sample line section data are presented.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2004년도 추계학술대회
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• pp.197-203
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• 2004

Railway system is consisted of various resources such as rail-line, signal, and railcar. It is necessary to efficiently utilize these limited and expensive resources as much as possible up to given line capacity. So far, we treat the line capacity as the criteria for evaluating investment alternatives or for restricting train frequencies, and this criteria is calculated statical and experimental numerical formula. But, line capacity has special attribute that changes dynamically according to operational conditions, so there is a need of new line capacity estimation system. In this paper, we present an improved systematic line capacity model. The proposed model has three main components ; TPS(lain performance simulator), PES(parameter evaluation simulator), LCS(line capacity simulator). The concept of each sub-component is described, including the evaluation method of capacity parameters. And capacity parameter evaluation and estimation results using sample line section data are presented.

• 물과 미래
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• 제14권2호
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• pp.71-79
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• 1981

이 연구는 남한강유역의 월강우량과 월유출량을 추계학적 및 통계학적으로 분석하여 두 개의 시계열 모형식을 설정하였다. 월유출량의 시계별 모의기법은 모의합성하는 월유출량자료로 선형추계학적 모형을 유도하였다. 또한, 월강우량과 월유출량의 시계열모열은 기지 통계학적 변수를 갖는 임의 시계열이라 하여 유도하였으며, 이는 월유출량이 한 변수를 갖는 지수감소곡선의 특성과 이월기간에 대한 통계학적 변수로 전개되었다.

• 한국정밀공학회지
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• 제11권3호
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• pp.105-121
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• 1994

In this paper, we proposed the two-parameter model for predicting the residual strength in CFRP laminated composites subjected to high velocity impact and developed and formulated it based upon Cparino's by using the ratio of impact and the normalized residual strength. Critical indentation was obtained by the statical indentation tests. Impact tests were carried out through air-gun type impact equipment with the velocities varied 30-100m/sec. Projectiles were steel balls with 5 and 7mm in diameter. Test material was carbon/epoxy. The specimens were composed of [ .+-. 45 .deg. /0 .deg. /90 .deg. ]$\_$2/ and [ .+-. 45 .deg. ]$\_$4/stacking sequences and had 0.75$\^$T/*0.26$\^$W/*100$\^$L/(mm) dimension. Results from the proposed model were in good agreement with the test data. And failure mechanism due to high velocity impact is given here to examine the initation and deveolpment of damage by fractography and ultrasonic image system. The effects of the 0 .deg. -direction ply position and the amount to damage area on the residual strength are considered here.

• 한국콘텐츠학회논문지
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• 제10권3호
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• pp.53-63
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• 2010

최근 무선 센서 네트워크를 활용한 다양한 모니터링 시스템 구축이 활발히 이루어지고 있다. 무선 센서네트워크 기반 모니터링 시스템 구축을 위해서, 세 가지 사항을 고려해야 한다. 첫째, 지속적인 모니터링을 위해서, 노드 실패 감지 기법이 요구된다. 둘째, 센서노드는 제한된 배터리 용량을 지니기 때문에, 에너지 소모량 감소를 위한 효율적인 데이터 필터링 기법이 요구된다. 마지막으로 데이터 필터링 수행 시, 계산오버헤드를 감소시키는 기법이 필요하다. 기존 칼만 데이터 필터링 기법은 우수한 필터링 성능을 나타내는 반면, 데이터 예측값 계산과정이 복잡하여 센서 노드에서의 계산 오버헤드가 증가하는 단점이 존재한다. 이러한 문제점들을 해결하기 위하여 본 논문에서는 데이터 통계 분석 기반 데이터 필터링 기법을 제안한다. 제안하는 기법은 첫째, 노드 실패 감지를 지원하기 위해, 주기적으로 노드 생존 메시지를 수집한다. 둘째, 불필요한 전송 메시지 수 감소를 위하여 샘플 데이터를 노드 생존 메시지에 포함하여 전송하고, 수집된 샘플 데이터 집합을 바탕으로 데이터 필터링을 수행한다. 마지막으로, 서버에서 데이터 통계 분석을 이용한 데이터 필터링 범위를 계산하기 때문에, 센서에서는 단순 비교연산만을 수행함으로써 센서 노드에서의 계산 오버헤드를 감소시킨다. 아울러 성능 분석을 통해 제안하는 기법이 기존 칼만 필터링 기법보다 전송 메시지 수 측면에서 성능이 우수함을 보인다.

• 대한기계학회논문집A
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• 제29권9호
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• pp.1161-1168
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• 2005

As a result of vehicle maintenance of rocker arm shaft for 4-cylinder SOHC engine, failure analysis of rocker arm shaft is needed. Because more than $30\%$ of vehicles investigated have been fractured. Failure analysis is classified into an naked eyes, microscope and X-ray fractography etc. It can predict applied load as well as load type. These methods are applicable to components with simple boundary condition but aren't applicable to components with complex boundary condition. The existing fractography don't catch hold of failure boundary condition quantitatively. Especially, in case that the components isn't fractured at same position. We must determine the most dangerous failure boundary condition to evaluate their operation mechanism. The effect of various factors on response should be estimated to solve this statical problem. This study presents the most dangerous failure boundary condition of rocker arm shaft using orthogonal array and ANOVA in order to assure its robustness.

• 한국의류학회지
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• 제31권11호
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• pp.1500-1509
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• 2007

The purpose of this study was to observe lifestyle of female consumers aged 15-25. Also it was to measure brand awareness, to determine purchase criteria in fashion magazine, and to determine promotion preferences according to lifestyle segmentation variables. We distributed 600 questionnaires and 475 reliable questionnaires were used for a statical analysis. Data analyses were conducted with SPSS program on the frequency mean value, Chi-square test, Cluster analysis, and Factor analysis. We classified four clusters such as individual style seekers, trend seekers, promotion/good appearance seekers, and low fashion interest group, based on lifestyle variables. There was a significant difference in brand awareness in Vogue Girl, Cosmo Girl, Elle, Figaro, Ecole magazine among four clusters. There was a significant difference in such purchase criteria as favorable cover models, good "burok" which is a magazine supplement, brand names, and price among four clusters. In addition, the results of ANOVA represent that there was a significant difference in preferred types of promotion such as discount price, clothing gifts, fashion accessary gifts and hair tool gifts. However, the first ranked preferred one was a cosmetic gift in all the magazines, which favored more by trend seeker group.

• 혜화의학회지
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• 제21권1호
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• pp.65-78
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• 2012

Found on the 19th century, GuiLinGuBon can have more several unique features than the other extinguish editions. GuiLinGuBon has been Receiving attention, because it contains both and 's contents, as well as it consistt of 16 books to the same as the preperce, and then it analyzed the chapter on Wending Disease(溫病) and Liuyin Disease(六淫病) in detail which is not written in current book, and gives several clues to solve many questions that caused the controversy. This thesis is the study the GuiLinGuBon on the overall composition and the prescriptions for the overall analysis to book configuration, herbs configuration, 8 method(八法) according to the prescribed frequency, SinNongBonChoGyong(神农本草经) according to the herbs of the SamPum(三品) classification and statistical processing GuiLinGuBon the specific features were analyzed.

• 한국지능시스템학회논문지
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• 제23권3호
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• pp.220-225
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• 2013

항구 등 선박교통이 밀집된 구역에서 선박의 사고는 빈번하게 발생한다. 해양사고는 한번 발생하면 대형사고로 이어질 확률이 높으므로, 철저한 해상교통관리가 필요하다. 본 연구에서는 실 해역의 통계적인 해상교통정보와 실시간 선박 통항분포를 바탕으로 항로 위험도를 정량적으로 평가하기 위한 시뮬레이터를 개발하고자 한다. 항로 위험도 평가 시뮬레이터는 항로정보 입력부, 통항분포 분석부, 알고리즘 실행부로 구성하였다. 또한 완도해역의 해상교통정보를 시뮬레이터에 적용하여 항로의 정량적인 항로 위험도를 산출하고자 한다.

• 한국운동역학회지
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• 제22권2호
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• pp.131-140
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• 2012

This study was to investigate the relationship between the distance and projection factors, angle factors of javelin in women's javelin throwing. The data were collected in the 2011 National Sports Festivals for 11 players. Three-Dimensional motion analysis using a system of 4 video cameras at a sampling frequency of 60 fields/s was performed for this study. The factors of release conditions calculated using Matlab 2009a program. The statical analysis on the records(n=42) included mean and standard deviation of the mean(SD), Pearson's product moment correlation coefficient(SPSS Version 16.0 for Windows). There was a statistically significant positive relationship between the records and release velocity(r=.866, p<.01), height(r=.433, p<.01) and height rate(r=.340, p<.05). The attitude angle, release angle, and attack angle showed not a statistically significant relationship between the records. The medial-lateral tilt angle of javelin showed not a statistically significant relationship between the records, but the yaw angle of javelin(r=.549, p<.01) showed a statistically significant positive relationship between the records.