차량 주행특성을 고려한 감속 완화곡선 설계방법 개발

이점호 한국도로학회 2008 한국도로학회논문집 Vol.10 No.3

I study for design criteria and research about Interchange diverging area of express highway and freeway. the most recent, at interchange diversion of express highway and freeway, design criteria and researches are focus on safety guarantee a point of view movement dynamics of vehicle and road geometric as to transition section, deceleration section, curve radius, nose section, outflow angle etc. that is, design criteria and research of Interchange diverging area have not consider a point of view movement dynamics of vehicle and road geometric and driver. so that I will be focus characteristic of runing speed on trasion curve. and I will consider vehicle running speed characteristics and study problem of Interchange diverging area design criteria. For this study, First, analysis meaning about theory of now design criteria, Second, look at vehicle running speed and traffic accident characteristics of Interchange diverging area , Third, propose new deceleration transition curve design method get along vehicle running speed characteristics of Interchange diverging area. new deceleration transition curve design method put out new outcoums. that is, I definite cause to safety new deceleration transition curve design method better than pressently, used design criteria of Interchange diverging area. especially, deceleration transition curve design criteria produced good result in the running speed 50km/h,40km/h, that is inertia better than inertia of present used design criteria. and deceleration transition curve is extended better than present transition curve criteria. so that new deceleration transition curve design method safety is good better than the past method safety. I study for design criteria and research about Interchange diverging area of express highway and freeway. the most recent, at interchange diversion of express highway and freeway, design criteria and researches are focus on safety guarantee a point of view movement dynamics of vehicle and road geometric as to transition section, deceleration section, curve radius, nose section, outflow angle etc. that is, design criteria and research of Interchange diverging area have not consider a point of view movement dynamics of vehicle and road geometric and driver. so that I will be focus characteristic of runing speed on trasion curve. and I will consider vehicle running speed characteristics and study problem of Interchange diverging area design criteria. For this study, First, analysis meaning about theory of now design criteria, Second, look at vehicle running speed and traffic accident characteristics of Interchange diverging area , Third, propose new deceleration transition curve design method get along vehicle running speed characteristics of Interchange diverging area. new deceleration transition curve design method put out new outcoums. that is, I definite cause to safety new deceleration transition curve design method better than pressently, used design criteria of Interchange diverging area. especially, deceleration transition curve design criteria produced good result in the running speed 50km/h,40km/h, that is inertia better than inertia of present used design criteria. and deceleration transition curve is extended better than present transition curve criteria. so that new deceleration transition curve design method safety is good better than the past method safety.

NONPARAMETRIC MAXIMUM LIKELIHOOD ESTIMATION OF A CONCAVE RECEIVER OPERATING CHARACTERISTIC CURVE VIA GEOMETRIC PROGRAMMING

Lee, Kyeong-Eun,Lim, Johan Korean Mathematical Society 2011 대한수학회보 Vol.48 No.3

A receiver operating characteristic (ROC) curve plots the true positive rate of a classier against its false positive rate, both of which are accuracy measures of the classier. The ROC curve has several interesting geometrical properties, including concavity which is a necessary condition for a classier to be optimal. In this paper, we study the nonparametric maximum likelihood estimator (NPMLE) of a concave ROC curve and its modification to reduce bias. We characterize the NPMLE as a solution to a geometric programming, a special type of a mathematical optimization problem. We find that the NPMLE is close to the convex hull of the empirical ROC curve and, thus, has smaller variance but positive bias at a given false positive rate. To reduce the bias, we propose a modification of the NPMLE which minimizes the $L_1$ distance from the empirical ROC curve. We numerically compare the finite sample performance of three estimators, the empirical ROC curve, the NMPLE, and the modified NPMLE. Finally, we apply the estimators to estimating the optimal ROC curve of the variance-threshold classier to segment a low depth of field image and to finding a diagnostic tool with multiple tests for detection of hemophilia A carrier.

예술심리치료에서 대학생의 인생곡선 반응특성과 회복탄력성 관계 예비연구

유경미,조용태 한국예술심리치료학회 2014 예술심리치료연구 Vol.10 No.2

본 연구는 예술심리치료 장면에서 대학생의 인생곡선에 나타난 반응특성과 회복탄력성의 관계를 확인하는데 목적이 있다. 경기북부와 충북에 소재하고 있는 대학교 재학생을 군집표집에 의해 58명을 표집하였다. 자료분석은 SPSS 18.0을 이용하여 신뢰도검증, 독립표본 t검증, 상관분석을 실시하였다. 연구결과는 첫째, 성별에 따라 인생곡선 반응특성과 회복탄력성은 유의미한 차이가 없었다. 둘째, 인생곡선의 굴곡 수는 자기조절능력과 상관이 있었고, 자기조절능력의 하위요인 중 충동통제력, 원인분석력에서 부적상관을 보였다. 셋째, 인생곡선 굴곡 방향에 따라 회복탄력성은 유의미한 차이가 없었다. 넷째, 회복탄력성이 낮은 집단은 높은 집단보다 인생곡선의 굴곡 수와 부정사건 수가 많은 것으로 나타났다. 본 연구결과를 토대로 인생곡선 반응특성인 굴곡 수 긍정사건 수, 부정사건 수, 최종방향은 회복탄력성과의 관계를 확인하는데 의미 있는 특성인 것을 확인하였다. 또한, 본 연구는 그림투사기법의 맥락에서 인생곡선의 반응특성을 제시하는 최초의 시도로써 가치가 있다고 여겨진다. 인생곡선 반응특성은 회복탄력성 뿐만 아니라 스트레스, 자기효능감, 낙관성, 주관적 안녕감 등의 관련 변인과의 관계들을 계속해서 규명해볼 필요가 있겠고, 후속연구를 통해서 하나의 투사검사로써 인생곡선이 얼마나 유용하고 타당한지를 검증할 필요가 있을 것이다 This research aims to examine the relation between college students' response characteristics and resilience shown in life curve. 58 student at one university located in Northern Gyeonggi and Chungbuk, participated in cluster sampling. SPSS 18.0 was used in data analysis in order to conduct reliability verification, independent samples T-test, and correlation analysis. According to the study result, first, response characteristics and resilience of life curve had no significant difference in terms of sex. Second, number of curves in life curve had correlation with self control ability, and showed negative correlation in compulsion control, cause analysis skills, among sub-factors. Third, resilience had no significant difference, based on the directions of curves on life curve. Fourth, group with low resilience revealed more numbers of curves and negative events in life curve than that of group with high resilience. Based on this study result, it was confirmed that number of curves, number of positive events, number of negative events, final direction, which are response characteristics in life, are significant characteristics to examine relation with resilience. In addition, this study is valuable in that it is the first attempt to suggest response characteristics in life curve, in context of projective techniques using drawings. Besides resilience, there is a need for continuous investigation to relation with relevant variables, such as stress, self-efficacy, optimism, subjective well-being, and others, and it is necessary to examine that as a visual inspection method, how useful and appropriate the life curve is, and through follow-up study.

Nonparametric maximum likelihood estimation of a concave receiver operating characteristic curve via geometric programming

이경은,임요한 대한수학회 2011 대한수학회보 Vol.48 No.3

A receiver operating characteristic (ROC) curve plots the true positive rate of a classifier against its false positive rate, both of which are accuracy measures of the classifier. The ROC curve has several interesting geometrical properties, including concavity which is a necessary condition for a classifier to be optimal. In this paper, we study the nonparametric maximum likelihood estimator (NPMLE) of a concave ROC curve and its modification to reduce bias. We characterize the NPMLE as a solution to a geometric programming,a special type of a mathematical optimization problem. We find that the NPMLE is close to the convex hull of the empirical ROC curve and,thus, has smaller variance but positive bias at a given false positive rate. To reduce the bias, we propose a modification of the NPMLE which minimizes the L_1 distance from the empirical ROC curve. We numerically compare the finite sample performance of three estimators, the empirical ROC curve, the NMPLE, and the modified NPMLE. Finally, we apply the estimators to estimating the optimal ROC curve of the variance-threshold classifier to segment a low depth of field image and to finding a diagnostic tool with multiple tests for detection of hemophilia A carrier.

불포화토의 흙-수분 특성곡선에 관한 실험적 고찰

송창섭 ( Song Chang Seob ),김명환 ( Kim Myung Hwan ) 한국농공학회 2003 韓國農工學會誌 : 전원과 자원 Vol.45 No.6

The purpose of this paper is to investigate the soil-water characteristic curves for an unsaturated soil. To this ends, a series of suction measured test was conducted on the selected 4 kinds of soils taken from different sites of Korea, using modified pressure plate apparatus. Form the test results, the water contents, degree of saturation and volumetric water contents were analyzed with the suction. And the soil-water characteristic curves of unsaturated soil were drawn from the test results for various factors. The characteristic curves drawn with water content vs matric suction were classified certainly the difference in wet side but were not classified in dry side. The characteristic curves drawn with degree of saturation vs matric suction for unsaturated soil were shown the opposite inclination as compared with the former curve. But the characteristic curve with volumetric water content vs matric suction was described suitably not only in wet side condition but also in dry side. And it was found that the volumetric water contents of loose soil was high at the initial condition but that of dense soil was high at final condition (dry side).

현장 도로사면의 불포화 수분특성에 관한 사례 연구

김정수,박현수,김병수,박성완 한국도로학회 2019 한국도로학회논문집 Vol.21 No.1

PURPOSES : This study compares the results of field-monitored unsaturated hydraulic data to verify the wetting path estimation method using the drying path on roadside soil slope. METHODS: A method proposed by Fredlund was used to estimate the wetting curves of soil water characteristic curves. Wetting curves were estimated from the drying curve acquired mainly from laboratory testing, and the estimated wetting curve was applied to the infiltration analysis to verify the estimation method. The infiltration analysis results obtained from the drying, wetting, and estimated wetting curves were compared to the field-monitored data at the same location. RESULTS : The volumetric water contents measured at 40 cm were closest to analysis results obtained from the wetting curve, whereas the volumetric water content measured at 80 cm were closest to the analysis results obtained from the drying curve. The results of the estimated wetting curves were between the results of the drying and wetting curves. The measured suction results were within the drying and wetting curves, and the estimated wetting curves were within the drying and wetting curves. Additionally, the safety factor obtained from applying the drying curves was carefully calculated, and the factor of safety of the estimated wetting curves was close to the results of the wetting curves. CONCLUSIONS : Applying a drying curve to calculate the slope stability during the rainy season will cause an overestimation of the factor of safety at roadside soil slopes. However, if the proposed estimation method of the wetting curve can be applied to the numerical analysis, the stability of the road slope can be reasonably estimated.

함수특성곡선 이력현상이 지반 내 모관흡수력에 미치는 영향

김재홍,송영석,김태형,황웅기 한국지반공학회 2012 한국지반공학회논문집 Vol.28 No.4

Soil-water characteristic curves (SWCCs), which represent a physical property in partially saturated soils, show the relation between volumetric water content and matric suction. The SWCCs exhibit hysteresis during wetting and drying,however experimental expressions used to describe SWCCs have generally ignored the hysteresis. In addition, the shape of SWCC may depend on the void ratio which is changed by soil skeleton deformations or hysteretic behavior under various loading conditions. Hence, it is necessary to understand, both empirically and analytically, the relationship between soil skeleton deformations and the SWCCs of various soils. The typical SWCCs experimentally have drying,wetting, and the second drying curve. The measurement of a complete set of hysteretic curves is severely time-consuming and difficult works, then the first drying curve of SWCC is generally determined to estimate the hydraulic conductivity and shear strength function of partially saturated soils. This paper presents the hydraulic-mechanical behavior of partially saturated soils (weathered soil and silty soil) for volume changes and hysteresis in SWCCs regarding the difference between the first drying and wetting curve.

플로우 펌프기법을 이용한 포천지역 화강 풍화토의 함수특성곡선

이강일,이준용,백원진,Lee, Kang-Il,Lee, Joon-Yong,Back, Won-Jin 한국농공학회 2009 한국농공학회논문집 Vol.51 No.1

Flow pump technique was used in order to determine the soil-water characteristic curve of weathered granite soils in Pocheon area. This technique enables measurement to be more convenient and accurate as it is based on the CU condition of triaxial compression test. Besides, it is also able to measure dry and moisture curves continuously since the test is controled by means of a computer automatically. In this study, not only a hydraulic conductivity of weathered granite soils at fully saturated state in Pocheon area, but also a soil-water characteristic curve throughout unsaturate flow tests were determined. In addition, Brooks and Corey's model and Genuchten's model were used to simulate the soil-water characteristic curve. On the basis of the simulation an unsaturate hydraulic conductivity was predicted.

불포화 화강풍화토의 함수특성곡선에 대한 확률론적 특성 연구

전경한,이승래,김윤태,Jeon,Kyung Han,Lee,Seung Rae,Kim,Yun Tae 한국방재학회 2012 한국방재학회논문집 Vol.12 No.3

실험적인 방법을 사용하여 함수특성곡선을 산정할 때 많은 시간과 비용이 소요될 뿐만 아니라 필연적으로 불확실성을 내포하기 때문에 사면안정해석에 사용될 대표적인 값을 획득하기 힘들다. 또한 결정론적인 방법은 하나의 대표적인 값을 사용하기 때문에 분산이 심한 변수를 사용할 경우 잘못된 평가를 초래할 수 있다. 이를 해결하기 위해 확률론적 해석방법이 이용되고 있다. 하지만 확률론적 해석을 위해 지반정수에 대한 확률론적 특성 연구가 선행되어야 함에도 불구하고, 불포화 지반정수에 대한 확률론적 특성 연구는 이루어지지 않고 있다. 따라서 본 연구에서는 국내 화강풍화토의 함수특성곡선에 대한 확률론적 특성을 파악하고 결합확률분포함수를 위한 대수변환모델을 산정하였다. 적합성 검증에 의하면 함수특성곡선의 맞춤변수는 대수분포를 가진다. Experimental evaluation of soil-water characteristic curve (SWCC) is costly and time consuming. SWCC of unsaturated soil always involves uncertainties associated, making it difficult to obtain a representative value in analyzing the stability of slopes. The deterministic approaches have been employed to analyze the slope stability. However, variables with severe variance sometimes lead to misestimating and hence the consequence also varies from person to person. To address this problem, a probabilistic approach to the analysis of slope stability has been adopted. Even though the probabilistic characteristics of soil are essential for probabilistic approach, it has not been established. Therefore, in this paper, the probabilistic characteristics of SWCC of weathered granite soil in Korea were defined. Based on the probabilistic characteristics, translation models for the joint probability distribution were determined. According to the results of goodness-of-fit test, the lognormal distribution appears to be the most suitable distribution to represent the experimental data of the curve-fitting parameters.

마케팅자료에서 특성점들을 이용한 군집방법

문숙경,김우성 한국품질경영학회 2004 품질경영학회지 Vol.32 No.4

We got the growth distance curve by spline smoothing method with observed marketing data and the growth velocity curve by the derivation of the growth distance curve. Using this growth velocity curve, we defined the several characteristic points which describe the variation of marketing data. In this paper, to specify several patterns of marketing data, we suggested characteristic function by using these characteristic points. In addition, we applied characteristic function to the seventeen brands of electric home products data.