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바이모달 트램의 후진주차보조 알고리즘 개발에 관한 연구
최성훈(Seonghoon Choi),박태원(Taewon Park),이수호(Sooho Lee),문경호(Kyeongho Moon) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.5
The bi-modal tram is under development as a new public transportation. The features of the tram are an extended wheel base and its length. This features result in difficulties for drivers on maneuvering the tram. Therefore, the all wheel steering system is applied to the articulated vehicle. The AWS system enables the vehicle to steer all the rear wheels independently and improves its driving characteristics. However, the bi-modal tram has a problem to move backward in the limited place because of its geometric feature and the AWS system. Hence, the reverse parking assistant algorithm for articulated vehicle is developed to solve the problems of the reverse parking. Using the vehicle model which includes the reverse parking assistant algorithm, the dynamic analysis is performed for several parking cases. By the result of the analysis, the stability and validity of the reverse parking assistant algorithm is verified.
박태원(Park, Taewon),박현빈(Park, Hyunbin),장준기(Chang, Joonki),박종석(Park, Jongseok),유민숙(Yoo, Minsook) 한국과학영재교육학회 2021 과학영재교육 Vol.13 No.1
이 연구는 과학고에서 진행하는 Research & Education (R&E) 과제로 수행되었다. 본 연구에서는 기상청에서 제공하는 한반도 60개 관측소에서의 2000년부터 2019년까지의 일최고기온과 일최저기온 자료를 사용하여 한반도 폭염과 열대야 발생일수에 대한 해안과 내륙, 도시와 시골, 지리적 위치의 영향에 대해 분석하였다. 해안 지역에서 폭염은 평균 6.8일로, 내륙 지역의 14.3일의 반 정도 밖에 발생하지 않았고, 열대야는 반대로 해안 지역에서 13.4일, 내륙 지역에서 5.8일의 평균발생일수가 나타났다. 이는 해안 지역이 높은 비열의 바다와 가까운 해양성 기후의 특성을 보이는 것에 기인한다. 폭염은 도시와 시골에서 둘다 약 12일의 평균발생일수를 포함하여 발생일수 분포가 거의 차이를 보이지 않았지만, 열대야는 도시에서 평균 10.9일이 발생하여 시골의 4.1일 평균 발생일수에 비해 매우 빈번하게 발생하였다. 도시열섬이 낮에는 크게 나타나지 않지만, 밤에 인공 구조물이 많은 열을 내보내기 때문에 이로 인해 도시의 열대야 발생이 크게 늘어나게 되었다. 위도는 폭염 발생과는 거의 관련성이 없고 열대야 발생과는 -0.54의 높은 음의 상관성을 보였다. 경도는 폭염과는 양의 상관성을, 열대야와는 음의 상관성을 보였지만, 그 상관계수는 각각 0.18, -0.20으로 작아 그 관련성은 작은 편이었다. 고도가 높을수록 폭염과 열대야 모두 적게 발생하는 경향이 있었는데, 그러한 경향성은 열대야에서 더 두드러지게 나타났다. This study is based on Research and Education (R&E) project in science high school. In this study, we investigated the regional impact on occurrences of heat waves and tropical nights over Korean Peninsula using daily maximum and minimum temperature at 60 stations provided from KMA during 2000-2019. Heat waves occur 6.8 days and 14.3 days in coastal and inland stations, respectively. On the contrary, occurrences of tropical nights are 13.4 days in coastal stations and 5.8 days in inland stations. This is due to the fact that coastal stations closer to the ocean have a maritime climate with high specific heat contents. The number of heat wave occurrences is very little difference between urban and rural stations, while tropical nights occur 10.9 days in urban stations, very often compared to the 4.1-day occurrences in rural stations. The urban heat islands do not appear much during the day, but artificial structures at night emit a lot of heat, which leads to a significant increase of tropical night occurrences in the urban stations. Latitude has little to do with the heat wave occurrences and has a high negative correlation of -0.54 with the tropical night occurrences. Longitude is positively correlated with the heat waves and negatively correlated with the tropical nights, but their correlation coefficients are small, 0.18 and -0.20, respectively. The higher the altitude, the fewer occurrences of heat waves and tropical nights tend to occur.
The Relationship between Epidemiologic Factors and Usage Pattern of Hair Care Products in Korea
( Kyung-duck Park ),( Byung Cheol Park ),( Ki Hyun Sung ),( Eunyoung Lee ),( Taewon Lee ),( Daeki Yoon ),( Kyu Bong Kim ),( Gyeong Hun Park ),( Il Yong Park ),( Myung Hwa Kim ) 대한피부과학회 2019 Annals of Dermatology Vol.31 No.3
Background: For hair care products that are used almost everyday, it is important to estimate the cumulative dosage of long-term exposure and to assess the effects on the human body. Little data are available to evaluate actual daily usage in Asian populations. Objective: Reliable exposure data for hair care products is essential to conduct safety assessments. Methods: We evaluated the actual usage pattern and amounts by checking the daily log over a 2-week period, to obtain all the data regarding the participants’ hair care preferences. And, statistical analyses were conducted to analyze the daily use amount (g/d) and daily usage per hair length (g/cm/d), and other variables by sex, age group, and hair oiliness. Results: Throughout this study, we found that female users consumed significantly larger daily amounts of shampoo and rinse. Male groups used more hair gel and spray than female groups. Interestingly, all the hair care products studied scored higher levels of usage among men when calibrated per unit length. Koreans tend to use lesser amount of rinse although their hairs are usually thicker than the Western hairs. Conclusion: This study provides exposure information for commonly used hair care products, which will be useful for risk assessment purposes. (Ann Dermatol 31(3) 307∼314, 2019)
Park, Yeonah,Kang, Eunah,Kwon, Oh-Joon,Hwang, Taewon,Park, Hongkwan,Lee, Jung Min,Kim, Jung Hyun,Yun, Chae-Ok Elsevier 2010 Journal of controlled release Vol.148 No.1
<P><B>Abstract</B></P> <P>For effective cancer gene therapy, systemic administration of tumor-targeting adenoviral (Ad) complexes is critical for delivery to both primary and metastatic lesions. Electrospinning was used to generate nanocomplexes of Ad, chitosan, poly(ethylene glycol) (PEG), and folic acid (FA) for effective FA receptor-expressing tumor-specific transduction. The chemical structure of the Ad/chitosan–PEG–FA nanocomplexes was characterized by NMR and FT-IR, and the diameter and surface charge were analyzed by dynamic light scattering and zeta potentiometry, respectively. The average size of Ad/chitosan–PEG–FA nanocomplexes was approximately 140nm, and the surface charge was 2.1mV compared to −4.9mV for naked Ad. Electron microscopy showed well-dispersed, individual Ad nanocomplexes without aggregation or degradation. Ad/chitosan nanocomplexes retained biological activity without impairment of the transduction efficiency of naked Ad. The transduction efficiency of Ad/chitosan–PEG–FA was increased as a function of FA ratio in FA receptor-expressing KB cells, but not in FA receptor-negative U343 cells, demonstrating FA receptor-targeted viral transduction. In addition, the transduction efficiency of Ad/chitosan–PEG–FA was 57.2% higher than chitosan-encapsulated Ad (Ad/chitosan), showing the superiority of FA receptor-mediated endocytosis for viral transduction. The production of inflammatory cytokine, IL-6 from macrophages was significantly reduced by Ad/chitosan–PEG–FA nanocomplexes, implying the potential for use in systemic administration. These results clearly demonstrate that cancer cell-targeted viral transduction by Ad/chitosan–PEG–FA nanocomplexes can be used effectively for metastatic tumor treatment with reduced immune reaction against Ad.</P> <P><B>Graphical abstract</B></P> <P>Ad nanocomplexes composed with chitosan–PEG–FA and processed via electrospinning showed high transduction efficacy and low immune responses.</P> <P>[DISPLAY OMISSION]</P>
카본섬유를 적용한 고분자복합소재로 제조한 조향 장치 부품 경량화에 대한 연구
박태원(Taewon Park),하동헌(DongHeon Ha) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Worldwide, the lightweight car parts for environment-friendly and fuel economy improvement for product development is accelerating. Existing polymers in this study by the addition of Glass Fiber stiffness secure, but in the lighter parts of steering system, replacing it by the addition of carbon composite material Carbon fiber was also investigated. PA66 Carbon Fiber material and applied in thermoplastic injection, Carbon Fiber Reinforced Plastic (CFRP) materials developed by the thermosetting compression to the existing metal steering system parts replaced were applied. Optimize the design of the components and material evaluation, progress and interpreted in accordance with the lightweight, basic physical properties were obtained. Ass"y for the final assembled so developed parts were evaluated for performance and durability. Evaluation results of existing Steel compared to the 70% level, and by 30 to 50 percent lighter effect parts, and achieve the level of physical properties, components and Ass"y strength, performance, and room temperature for the duration of the goals were satisfied. Endurance limit in the future, and to propel the vehicle test plans to conduct additional verification.