Distribution of Uniform Reliability over AADTs Estimated for a New Highway Route

Heung-Un Oh 대한토목학회 2003 KSCE journal of civil engineering Vol.7 No.5

Risk Assessment by Vehicle Speed Difference in Climbing Lanes

Oh, Heung-Un,Kang, Jin-Gu The Korean Society of Safety 2010 International Journal of Safety Vol.9 No.1

The speed difference in mountainous area is known causing traffic conflicts and accidents. Thus, climbing lanes have popularly been installed in mountainous roads around the world. In the present paper, vehicle speeds within and around climbing lanes of Ho-nam and Jung-ang expressway were collected and evaluated. The evaluation was performed in terms of coefficient of variations which represent dispersion of vehicle speed in climbing lanes. Results show that speed dispersion is more significant at segments before and after climbing lanes than those within climbing lanes. The estimated accident risk was evaluated using The Solomon's u-shaped curve. It was identified that the accident risk is also a lot significant at the same segments as much as 2.2 times greater than those of climbing lanes.

도로환경에서 차선반사도 성능의 영향변수에 따른 특성

오흥운(Oh Heung-Un) 대한토목학회 2007 대한토목학회논문집 D Vol.27 No.3D

차선반사도의 성능은 교통사고 감소와 교통용량, 차량속도의 일정 유지와 밀접한 관련이 있는 것으로 알려져 있다. 본 논문에서는 전국의 시간적, 공간적으로 샘플링된 차선반사도 데이터 베이스 자료를 이용하여 차선 반사도 성능의 영향변수별 특성에 대하여 밝히고자 하였다. 현재 인간공학적 허용치에 대하여 고속도로의 경우 백색, 황색에 대하여 각각 110, 90 mcd/㎡/lux으로 정해져 있으나 관찰된 결과는 인간공학적 허용치를 균일하게 만족시키지 않는 것으로 나타났다. 영향변수인 12개월 변화, 일평균교통량에 따라 그리고 가열형, 내마모성, 변성아크릴, 수용성, 융착식과 같이 재료별로 인간공학적 최소치와 차이가 있음이 관측되었다. 본 논문을 통해 차선반사도 영향변수와 관련된 사항을 추론할 수 있다. 첫째 현재 영향변수별로 관측된 차선반사도가 인간공학적인 최소반사도와 차이가 있으므로 최소치와 관찰차이를 줄일 수 있는 개선형 인간공학연구나 재료시험연구가 필요하다. 둘째, 영향변수의 하나인 교통량이 많은 곳에서 관측된 차선반사도의 감소가 심하므로 그 적정유지방법에 대한 연구가 필요하다. 셋째 영향변수의 하나인 재료적 특성 성능과 인간공학적 최소반사도 성능이 차이가 나므로 재료별 차별적 사용방법을 검토해야 한다. 넷째, 관찰된 차선반사도의 영향변수별 표준편차가 매우 심한 것으로 확인되었다. 따라서 차선 성능의 교통시설물로서의 일관성 유지 방안이 추가로 심도 있게 연구 되어야 한다. Retroreflectivity is known to be correlated to levels of traffic capacity or uniformity of vehicle speeds. The present paper uses the nation wide data base of freeway retroreflectivity then tries to single out the characteristics of retroretlectivity according to levels of influencing factors. Currently, the ergonomic and allowable minimum retroreflectivity for Korean freeway is 110 and 90 mcd/㎡/lux for the white and the yellow pavement marking, respectively. It was resulted that observed values do not satisfy the minimum value uniformly. Following levels of influencing factors such as changes by 12 months, annual daily traffic, and material characteristics such as thermoplastic, durable, epoxy, water-borne, and solvent-borne paint, the observed values shows gaps from the minimum values. Consequent conclusions maybe be inferred. First, as observed shows gaps from the minimum values, there should be ergonomic and materialistic study performed for narrowing the gaps. Secondly, for the higher traffic volume road section, there should be countermeasures to maintain uniformity of retroreflectivity. Thirdly, as it is found out there is gaps between observed and ergonomic minimum retroretlectivity, there should be proper ways case by case to choose the materials of pavement markings before painting works. Fourth, as standard deviations of observed retroreflectivity for all influencing factors are considerable, ways to sustain uniformity as one of traffic control devices should be studied.

고속도로 차선반사도 적정성

오흥운(Oh Heung-Un),김민석(Kim Min-Seok) 대한토목학회 2003 대한토목학회논문집 D Vol.23 No.5D

버스전용차로 차량속도 감소에 관한 연구

오흥운(Oh Heung-Un) 대한토목학회 2003 대한토목학회논문집 D Vol.23 No.5D

교통관리자의 자기평가에 근거한 교통관리 평가

오흥운(Oh,Heung-Un),오승훈(Oh,Seung hwoon) 대한토목학회 2011 대한토목학회논문집 D Vol.31 No.5D

교통관리업무에서는 교통관리지원 장비뿐만 아니라 교통관리자 개인의 판단, 지식의 역량 등 인적요소에 의하여 교통성과 의 차이가 난다. 따라서 특정조직에서 교통관리 소속원의 자기평가는 교통관리조직의 성과진단 혹은 상태진단을 하는 간접도 구로 사용될 수 있다. 본 논문은 국내 다양한 교통관리집단과 일본특정교통관리집단의 자기평가를 통하여 국내 특정 도시간 선도로관리기관의 교통관리 상태를 평가하여 적정성을 검토하는 것을 목적으로 하였다. 그 결과로서 국내 간선도로관리집단의 조직이 성과, 활동, 미래지향성, 고객 지향성 등에서 다른 집단 보다 우수한 것으로 나타났다. 그 집단에 대하여 근무지 별로 상세 평가를 하였다. 근무지별로는 본부, 지역본부, 현장, 정보센타, 연구원으로 구분하였다. 근무자들은 소속된 근무지의 교통관리 특성에 맞게 다양한 교통관리 요소의 개선 필요성을 제시하였다. During practices of traffic management, the performance achieved was determined by traffic practitioners' ability of decision and knowledge as well as traffic equipments assisting the practitioners. Therefore, sometimes self-evaluations done by the traffic practitioners in a specific traffic organization can be used to indirectly evaluate the traffic management organization. The present paper is to evaluate a specific highway agency using self-evaluations performed among different highway agencies including one Japanese highway agency. The result indicated that the agency is superior to other agencies in characteristics such as performance, activity, preparation for the future, and customer orientation. For more detailed-branch based study, the responders were divided into their belonged branches like headquarter, regional headquarter, maintenance office and research center. The results provided that various deficiencies of traffic management were found and could be improved in the future.

도로 선형특성에 따른 럼블스트립의 교통사고 감소효과

이흥운(Oh Heung-Un) 대한토목학회 2010 대한토목학회논문집 D Vol.30 No.3D

럽블스트립은 교통사고 감소에 기여를 하는 것으로 국내외 논문을 통해 잘 알려져 있다. 본 논문은 도로의 기하구조와 럼블스트립의 설치효과 관계에 대하여 교통사고 감소통계를 이용하여 분석하였다. 고속도로 구간에서 럼블스트립 설치전후의 교통사고 통계를 비교하였고 럼블스트립 설치지점의 평면선형, 종단선형, 설치길이와 비교하였다. 분석결과, 종단선형이 하향(-)인 구간에서 럼블스트립 설치효과가 높은 것으로 나타났다. 평면선형상에서 우곡선구간에서 효과적임을 알 수 있었다. 또한 설치길이 면에서 상대적으로 설치길이가 작아도 교통사고 감소의 유의성이 높은 것으로 나타났다. It is well known that rumble strips contribute to reduce traffic accidents. The present paper provides the reduction effect of traffic accidents under specific highway geometries after rumble strip installation. Traffic accidents on freeway sections before and after rumble strip installation are compared when conditions of the highway geometric characteristics such as horizontal, vertical geometries are given. It is shown that rumble strips are effective under highway geometric conditions of down slopes or right curvatures. It is also shown that rumble strips are still effective with shorter length of installation.

A Medium Maturity, and High Quality Rice Variety, "Hwabongbyeo"

Byeong Geon Oh,Sang Jong Lim,Ki Hwan Yi,No Bong Park,Un Sang Yeo,Sae Jun Yang,Ho Yeong Kim,Heung Gu Hwang,Do Yeon Kwak,Jong Rae Kang,Jeom Sik Lee,Soon Chul Kim,Moo Sang Lim 한국육종학회 2003 한국육종학회지 Vol.35 No.1

This japonica cultivar was developed from a cross between two F1 hybrids of YR13168 (Milyang 95/Iri390) and YR13198 (Milyang101/Iri390) using anther culture. It has about 104 days of growing duration from seeding to heading and relatively short

Experimental Study of the Dynamic Characteristics of Rubber Mounts for Agricultural Tractor Cabin

Choi, Kyujeong,Oh, Jooseon,Ahn, Davin,Park, Young-Jun,Park, Sung-Un,Kim, Heung-Sub Korean Society for Agricultural Machinery 2018 바이오시스템공학 Vol.43 No.4

Purpose: To obtain the dynamic characteristics (spring stiffness and damping coefficient) of a rubber mount supporting a tractor cabin in order to develop a simulation model of an agricultural tractor. Methods: The KS M 6604 rubber mount test method was used to test the dynamic characteristics of the rubber mount. Of the methods proposed in the standard, the resonance method was used. To perform the test according to the standard, a base excitation test device was constructed and the accelerations were measured. Results: Displacement transmissibility was measured by varying the frequency from 3-30 Hz. The vibration transmissibility at resonance was confirmed, and the dynamic stiffness and damping coefficient of the rubber mount were obtained. The front rubber mount has a spring constant of 1247 N/mm and damping ratio of 3.27 Ns/mm, and the rear rubber mount has a spring constant of 702 N/mm and damping ratio of 1.92 Ns/mm. Conclusions: The parameters in the z-direction were obtained in this study. In future studies, we will develop a more complete tractor simulation model if the parameters for the x- and y-directions can be obtained.

A New Rice Variety Adaptable to Direct Seeding with Lodging Tolerance, "Nonghobyeo"

Sang Jong Lim,Un Sang Yeo,No Bong Park,Byeong Geun Oh,Sae Jun Yang,Ho Yeong Kim,Heung Gu Hwang,You Cheon Song,Do Yeon Kwak,Jong Rae Kang,Woon Goo Ha,Jeom Sik Lee,Soon Chul Kim 한국육종학회 2003 한국육종학회지 Vol.35 No.1

Nonghobyeo', was derived from a mutant of Milyang 95, by pure line selection method, which was developed from the single cross between Chukei 1016 and Milyang 79, by the rice breeding team of National Yeongnam Agricultural Experiment Station (NYAES) in 19