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자율주행시대에 통근시간 만족도에 영향을 미치는 요인분석
장재민,천승훈,이숭봉,Jang, Jae-min,Cheon, Seung-hoon,Lee, Soong-bong 한국ITS학회 2021 한국ITS학회논문지 Vol.20 No.5
자율주행시대가 우리 삶에 다가오면서 삶의 변화에 많은 영향을 미칠 것으로 예상된다. 자율주행자동차가 등장하면 운전자의 부담을 줄임으로 차내에서 생산적 가치가 확장되는 만큼 이를 평가할 수 있는 지표개발이 필요하다. 이번 연구는 경기도 직장인 중 승용차를 이용하는 통근자를 대상으로 자율주행 자동차가 통근시간 및 통근시간 만족도에 어떠한 영향을 미치는지 분석하였다. 통근시간 및 통근시간 만족도는 비선형 관계(V)가 도출되었다. 여기서, 자율주행시대에 영향받을 가능성이 높은 비선형 구간인 통근시간 70분 이상영역을 중심으로 이항로지스틱 모형을 통해 분석하였다. 분석결과 자율주행시대의 영향변수로는 건강도, 수면시간, 근무시간, 여가시간 등이 도출되었다. 자율주행자동차의 등장은 이러한 변수를 개선시킬 가능성이 높으므로 장거리 통근자의 통근시간 만족도는 개선될 가능성이 높다. As the era of autonomous driving approaches, it is expected to have a significant impact on our lives. When autonomous driving cars emerge, it is necessary to develop an index that can evaluate autonomous driving cars as it enhance the productive value of the car by reducing the burden on the driver. This study analyzed how the autonomous driving era affects commuting time and commuting time satisfaction among office goers using a car in Gyeonggi-do. First, a nonlinear relationship (V) was derived for the commuting time and commuting time satisfaction. Here, the factors affecting commuting time satisfaction were analyzed through a binomial logistic model, centered on the sample belonging to the nonlinear section (70 minutes or more for commuting time), which is likely to be affected by the autonomous driving era. The analysis results show that the variables affected by the autonomous driving era were health, sleeping hours, working hours, and leisure time. Since the emergence of autonomous driving cars is highly likely to improve the influencing variables, long-distance commuters are likely to feel higher commuting time satisfaction.
Licochalcone A가 대식세포주의 사이토카인 생성에 미치는 영향
이기세(Gi-Sae Lee),천승훈(Seung Hoon Cheon),이성호(Sung Ho Lee),강복윤(Bok Yun Kang),조영창(Young-Chang Cho),윤구(Goo Yoon) 대한약학회 2009 약학회지 Vol.53 No.6
Licochalcone A is a chalcone isolated from the roots of Glycyrrhiza inflate. In this study, we examined the effects of licochalonce A on the production of cytokines in LPS-activated macrophages. Licochalcone A inhibited the secretion of proinflammatory cytokines such as IL-1β IL-6, and TNF-? The reduced secretion of proinflammatory cytokines is related to the differences in the mRNA expression of IL-1β IL-6, and TNF-α Moreover, licochalcone A inhibited the mRNA expression of IL-12p40, IL-18, and IL-23p19. To investigate its mechanism, we performed gel shift assay. Licochalcone A reduced nuclear NF-kB binding activity in LPS-activated RAW264.7 cells. Taken together, these results suggest that licochalcone A has anti-inflammatory effects in LPS-activated macrophages and its mechanism could be through the down-regulation of binding to the kB site.
정병호(Byung Ho Chung),천승훈(Seung Hoon Cheon),정순영(Soon Young Chung) 대한약학회 2005 약학회지 Vol.49 No.4
Structure-activity relationship studies of allylamine type of antimycotics were carried out to evaluate the effect of naphthyl and methyl portion of naftifine. Compounds with 3,4-difluorophenyl (2a-5a), 4-hydroxyphenyl (2b-5b), 3-nitro-phenyl (2c-5c), 4-chlorobenzothiazolyl (2d-5d) and 5-methylfurfural (2e-5e) instead of naphthyl group, and with hydrogen (3a-3e), methyl (4a-4e) and ethyl (5a-5e) in the place of methyl in naftifine were synthesized and tested for their in vitro anti-fungal activities against five different fungi. Fourteen compounds (3a, 4a, 5a, 3b, 4b, 5b, 3c, 4c, 5c, 3d, 4d, 3e, 4e and 5e) showed significant anti-fungal activities against. T. mentagrophytes. (E)-N- (3-Phenyl-2-propenyl)-3,4-difluoro-benzenemethaneamine (3a), (E)-N-(3-phenyl-2-propenyl) -4- hydroxy -benzenem ethaneamine (3b) and (E)-N-ethyl-N-(3-phenyl-2-propenyl)-3-nitro-benzenemethaneamine (5c) displayed moderate anti-fungal activities against all five different fungi.
김현명(Kim, Hyunmyung),천승훈(Cheon, Seung Hoon),김찬성(Kim, Chan Sung),문대섭(Moon, Dae-Seop),안성희(An, Sunghi) 대한국토·도시계획학회 2016 國土計劃 Vol.51 No.4
In general, transportation infrastructures in the non-capital regions have an insufficient investment. The problem is the insufficient investment to transport services not only causes regional isolation but also puts limitation on economic participation of population so that people tend to choose a vehicle as a mode and make intra-zonal trips. So, this study aims at analyzing a regional disparity between the regions with the intra-zonal trips. With the navigation data, this paper counts the arrival and departure traffic for each regions in Korea. Then the study calculates the intra-zonal traffic and its’ ratio. With the traffic analysis zones(TAZs) are divided into two groups by the intra-zonal trip rate, this study analyzes the relationship between the TAZs and the regional characteristics. To define the regional characteristics, this study considers the economic aspects and transportation aspects. Group 1 which has a high ratio of intra-zonal trips shows a lower level of regional consumption tax, fiscal self-reliance ratio and public transport market share than Group 2 which has a row ratio of intra-zonal trips. However, Group 1 has the higher number of vehicle registration per person than Group 2. As the results, the Group 1 has a much lower level than Group 2 in economic and transportation aspects.
Licochalcone E 유도체들이 LPS에 의해 유도된 염증조절 분자들의 생성에 미치는 영향
조영창(Young Chang Cho),윤구(Goo Yoon),천승훈(Seung Hoon Cheon),강복윤(Bok Yun Kang) 대한약학회 2017 약학회지 Vol.61 No.3
Licochalcone E is a retrochalcone isolated from the roots of Glycyrrhiza inflate. We previously reported that licochalcone E inhibited IL-12p40 production and attenuated chronic allergic contact dermatitis (ACD). Among the derivatives of licochalcone E, compound #74 ((E)-3-(5-Bromo-4-hydroxy-2-methoxyphenyl)-1-(4-ethoxyphenyl)prop-2-en-1-one) inhibited the production of IL-12p40, TNF-α, and IL-6, and NF-κB signaling pathway from LPS stimulated RAW264.7 macrophages. The effect of compound #74 (0.5, 1, and 5%) on ACD model was very weak.
정병호(Byung Ho Chung),조원제(Won Jea Cho),천승훈(Seung Hoon Cheon),박면지(Myun Ji Park),유진철(Jin Cheol Yoo),천문우(Moon Woo Chun) 대한약학회 1997 약학회지 Vol.41 No.2
For the development of antifungal agents, modification of naftifine which exhibits significant antimycotic activity was performed by replacing the naphthalene ring of it to hetero cyclic rings such as morpholine. benzothiazole, piperidine and pyridine derivatives. The synthesized compounds were tested in vitro antifungal activity against five different fungi with naftifine as a comparative antimycotic molecule. From the biological evaluation two compounds, (E)-N-(3-phenyl-2-propenyl)-N-(4-piperidinylmethyl)amine(3d) and (E)-N-(3-phenyl-2-propenyl)-N-(3-pyridylmethyl)amine(3f) showed relatively noticeable activity(MIC=50mcg/ml). On the other hand, the other compounds had no activity.
박경선(Park, Kyoung Seon),남대식(Nam, Dai Sik),이충식(Lee, Choong Shik),천승훈(Cheon, Seung Hoon),김현명(Kim, Hyun Myung) 대한교통학회 2015 대한교통학회 학술대회지 Vol.73 No.-
현재 교통 계획 및 수요 분석에서 기종점간 통행량 자료(OD matrix)는 필수 요소이다. OD의 추정은 가구통행 실태조사 등의 샘플 조사를 통해 이루어지는데, 비용제약으로 많은 샘플을 확보하기 어려운 단점이 있다. 이에 분석데이터의 정확도에 대한 많은 논쟁이 있어왔다. 이러한 자료상 문제를 극복하기 위해 다양한 연구가 계속되고 있으나 통행자들의 실제 통행수요 패턴을 정확히 반영하지 못하고 있다. 하지만 최근 정보통신 기술이 발전하면서 교통계획 연구에서 활용할 수 있는 차량 내비게이션 자료가 장기간 반복적 으로 수집되고 이를 통해 신뢰성 있는 통행수요의 패턴 분석이 가능해지게 되었다. 따라서 본 연구에서는 차량 내비게이션 표본자 료를 이용하여 국가교통데이터베이스 OD의 정확도 평가 및 표본 OD 전수화 기법을 개발하고 통행 수요량 및 통행수요 패턴 분석 을 실시하였다. 본 연구를 시작으로 차량 내비게이션 자료는 향후 교통수요 OD 구축 및 검증 등 다양한 교통계획 분야에서 활용도 가 높아질 것으로 기대된다.
민재홍(Min Jea-Hong),목재균(Mok Jea-Kyun),한석윤(Han Seok-Yoon),천승훈(Cheon Seung-Hoon) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, we"ll change a data generated by the project for a database and make the better interface of all laboratory and a participating enterprise, constructing a knowledge-based management system to fit a characteristics within a country. Also, we"ll manage the light-rail transit system development efficiently and systematically, constructing the web-based knowledge information system.