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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.
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.
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.
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.
모빌리티 빅데이터 기반 도로부문 반복혼잡 심각도 우선순위 분석방법
이숭봉(LEE, Soongbong),김정민(KIM, Jeongmin),천승훈(CHEON, Seunghoon) 대한교통학회 2021 대한교통학회지 Vol.39 No.2
교통혼잡 원인 분석 및 해결방안 마련을 위해 모빌리티 데이터를 활용한 연구들이 활발하게 이루어지고 있다. 모빌리티 데이터는 ITS 인프라 관리 및 제한된 공간적 범위의 한계 극복이 가능하다. 또한, 개별차량의 주행궤적 수집이 가능하여 전국에 대해 객관적이고 일관성 있는 교통모니터링 및 분석을 가능하게 한다. 도로구간의 교통혼잡 문제는 국가 경제발전에 영향을 미치는 중요한 제약요소이다. 따라서 도로구간의 교통혼잡 수준을 평가하는 것은 교통관리 및 제어를 위해 중요하다. 기존연구에서 혼잡구간 판단지표는 대부분 단일 평가지표를 활용하였다. 하지만 교통의 복잡성 및 역동성을 고려할 때 다양한 지표를 활용한 평가 방법이 효율적일 수 있다. 본 연구에서는 데이터 수집 가능성과 범용적인 활용을 고려하여 속도기반 지표(혼잡강도, 혼잡지속시간, 혼잡구간길이, 병목발생비율, 반복혼잡비율)를 혼잡지표로 설정하였고, 종합점수를 산정하여 우선순위를 평가하였다. 이를 통해 반복혼잡 구간 모니터링, 교통정책 의사결정 지원, 도로 인프라 투자, 정책에 대한 사전 · 사후 평가 등 다양한 혼잡개선대책 마련에 도움을 줄 수 있을 것으로 기대한다. In order to analyze the causes of traffic congestion and prepare solutions, studies using mobility data are being actively conducted. Mobility data can manage ITS infrastructure and overcome the limitations of spatial range. In addition, it is possible to collect the trajectory of individual vehicles, enabling objective and consistent traffic monitoring and analysis across the country. The problem of traffic congestion in the road section is an important constraint affecting the development of the national economy. Therefore, assessing the level of traffic congestion on a section of the road is important for traffic management and control. In the previous studies, most of the indicators for congestion section used a single evaluation indicator. However, considering the complexity and dynamics of transportation, an evaluation method using various indicators can be effective. In this study, speed-based indicators (congestion intensity, congestion duration, congestion length, bottleneck rate, congestion rate) were set as congestion indicators in consideration of the possibility of data collection and general use. The priority of recurrent congestion severity was evaluated by calculating the composite score using various congestion indicators. Through this study, it is expected that it will be able to help prepare various measures to improve congestion, such as monitoring recurrent congestion sections, support for decision-making on transportation policies, investment in road infrastructure, and pre-post evaluation of policies.
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.