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테라헤르츠 시간 영역 분광법을 이용한 스피로파이란의 광 퇴화 특성 연구
방진혁,박명환,류한철,Bang, Jin-Hyuk,Park, Myoung-Hwan,Ryu, Han-Cheol 대한화학회 2016 대한화학회지 Vol.60 No.1
스피로파이란은 반복적인 광 변색현상 과정에서 광 퇴화 특성을 보이는 대표적인 물질이다. 스피로파이란은 뛰어난 안정성, 빠른 응답속도, 강한 색 변화, 빛에 의한 물질의 화학적, 물리적 특성 조절이 가능하다는 점으로 광 스위치, 광 메모리, 바이오 센서 등의 다양한 분야에 적용되고 있다. 하지만 스피로파이란은 광 퇴화되며 기능이 점차 떨어지기 때문에, 광퇴화에 따른 스피로파이란의 특성 변화에 대해 자외선-가시광선 분광법, 핵 자기 공명 분광법, 라만 분광법 등을 이용한 많은 연구가 이루어지고 있다. 본 연구에서는 스피로파이란의 광 퇴화 특성을 테라헤르츠 주파수 영역에서 테라헤르츠 시간 영역 분광법(Terahertz time-domain spectroscopy, THz-TDS)을 이용하여 측정 및 분석하였다. 반복적인 자외선 조사에 따른 스피로파이란의 광 퇴화 특성이 테라헤르츠 영역에서의 흡수량 증가로 나타남을 확인하였다. 이러한 스피로파이란의 광 퇴화 특성이 야기하는 테라헤르츠 영역 흡수량 변화 경향은 가시광선 영역 흡수량 변화 경향과 서로 반대됨을 확인할 수 있었다. The spiropyran is a typical material having photodegradation properties in the process of photochromism. The spiropyran has been utilized in various applications such as optical switch, optical memories, and biosensor because of its remarkable stability, fast responsive time, stronger color change, and photo-induced controllability. However, the spriropyran is photodegraded by the repetitive optical irradiation. The photodegradation of spiropyran have been investigated by using UV-Visible spectroscopy, nuclear magnetic resonance (NMR), and Raman spectroscopy. Herein, the properties of spiropyran were characterized by using terahertz time-domain spectroscopy (THz-TDS) in the terahertz frequency region. In terahertz region, the measured absorbance of spiropyran was increased due to the photodegradation induced by the repetitive UV irradiation. The absorbance tendency of spiropyran in the terahertz frequency region was compared with that in the visible region, and they were completely opposite to each other.
최은하,윤보름,박병석,안예찬,박명환,박용철,Choi Eun Ha,Yoon Bo Reum,Park Byoung Suk,An Ye Chan,Park Myoung Hwan,Park Yong Chul 대한방사선치료학회 2022 대한방사선치료학회지 Vol.34 No.-
Purpose: This study measures and compares the surface dose values in the virtual target volume using Tomotherapy, Halcyon, and TrueBeam equipment using 6MV-Flattening Filter-Free(FFF) energy. Materials and Methods: CT scan was performed under three conditions of without bolus, 0.5 cm bolus, and 1 cm bolus using an IMRT phantom (IBA, Germany). The Planning Target Volume (PTV) was set at the virtual target depth, and the treatment plan was established at 200 cGy at a time. For surface dosimetry, the Gafchromic EBT3 film was placed in the same section as the treatment planning system and repeated measurements were performed 10 times and then analyzed. Result: As a result of measuring the surface dose for each equipment, without, 0.5 cm, 1 cm bolus is in this order, and the result of Tomotherapy is 115.2±2.0 cGy, 194.4±3.3 cGy, 200.7±2.9 cGy, The result in Halcyon was 104.7±3.0 cGy, 180.1±10.8 cGy, 187.0±10.1 cGy, and the result in TrueBeam was 92.4±3.2 cGy, 148.6±5.7 cGy, 155.8±6.1 cGy, In all three conditions, the same as the treatment planning system, Tomotherapy, Halcyon, TreuBeam was measured highly in that order. Conclusion: Higher surface doses were measured in Tomotherapy and Halcyon compared to TrueBeam equipment. If the characteristics of each equipment are considered according to the treatment site and treatment purpose, it is expected that the treatment efficiency of the patient will increase as well as the treatment satisfaction of the patient.
이승배(Seung Bae Lee),정병용(Byung Yong Jeong),박명환(Myoung Hwan Park) 대한인간공학회 2018 大韓人間工學會誌 Vol.37 No.2
Objective: This study aims to understand the accident characteristics of the foreign workers in domestic chemical industry and to present analytic results for basic guidelines on accident prevention. Background: It is known that foreign workers constitute greater portion of workers in industries that are dirty, difficult and dangerous especially chemical and construction industries. Method: This study analyzed the data of 2,272 workers in the chemical industry that have been approved as on-duty industrial accidents in 2015. The accident characteristics of foreign workers and Korean workers were analyzed in view of worker-related factors and accident-related factors. Results: There is no difference by nationality in the distribution of gender of the injured. The distribution of the injured according to nationality was found to be different in age, size of employment, type of employment, work experience, days of the week, time of the day, events or exposures, agent, type of injury, natures of injury and illnesses, injured body part. Conclusion: Foreign workers show a much higher proportion of injuries than Korean workers in the chemical industry. Comparing to the Korean injured, the foreign injured are employed by small size company and work on weekends and night or early in the morning more often. In addition, machine operating job is the major cause of the accidents and hand/wrist injuries constitute major portion of the injured body part. Application: The results of this study can be used as baseline data to devise systematic measures to prevent accidents for the foreign workers in the domestic chemical industry.
국내 플라스틱 제품 제조업의 작업공정별 재해 특성 분석
이승배(Seung Bae Lee),정병용(Byung Yong Jeong),박명환(Myoung Hwan Park) 대한인간공학회 2019 大韓人間工學會誌 Vol.38 No.2
Objective: This study aims to analyze the accident characteristics of the Korean manufacture of plastics products by work process and to provide analytic results for recommendations on accident prevention. Background: It is known that, In the chemical industry, the number of incidents is relatively small compared to the construction industry. But considering the risks and the possibility of damage, safety measures are needed in advance. Among chemical industries, manufacturing industry of the chemical material and chemical products including manufacture of plastics products are said to have the greatest number of serious disasters. Method: The data of 1,846 workers approved as industrial accidents compensation of year 2015 in the manufacture of plastics products were analyzed. The injury characteristics of workers were analyzed in view of worker-related and accident-related attributes by manufacturing work process. Results: The distribution of the injured workers by manufacturing work process was found to be different in nationality, age group, company size, employment type, work experience, events or exposures, agent, natures of injury and illnesses, injured body part. There is no difference in view of manufacturing work process in the employment type distribution of the injured. Conclusion: In the work preparation process, the proportion of injured workers under 40 years old, working at company with 5~15 employees, with 6 months to 1 year experience, injured by equipment and parts, and struck by and against were relatively high. In the reaction and maintenance processes, the proportion of injured workers by the chemical composite/ceramic manufacturing machine were relatively higher, and the proportion of injured workers by the vehicles and the conveyer including the forklift was relatively higher in the logistics process. Some recommendations for the prevention of occupational injuries were given. Application: The results in view of the manufacturing process can be used as a guideline to develop systematic measures for prevention of accidents in the manufacture of plastics products.
신동석(Dong Seok Shin),정병용(Byung Yong Jeong),정주성(Joo Sung Jung),박명환(Myoung Hwan Park) 대한인간공학회 2019 大韓人間工學會誌 Vol.38 No.5
Objective: This research aims to analyze the occupational deaths and violation of the Korean taxi drivers and to find out the effect of factors for recommendations on injury prevention. Background: Although there are many studies on traffic accidents, there are few studies on taxis, which are the main means of transportation. Moreover, There is little research on the industrial accidents of taxi drivers. Method: The data of 586 taxi drivers approved as industrial accidents compensation of years 2015 and 2016 were analyzed. Significant variables explaining deaths and violation were identified by binary logistic regression. Results: Drivers aged 65 or older are more likely to die from accidents than those under 65 (OR (odds ratio): 1.85, p =0.048). In addition, violations were more likely to lead to death than no-violation (OR: 1.94, p =0.046). Facial injuries were more likely to lead to death (OR: 2.38, p =0.003) and encephalorrhagia injuries were more likely to lead to death (OR: 3.82, p <0.001). Conclusion: In order to prevent accidents of the elderly drivers, it is necessary to reinforce safety education and to manage the driving license renewal cycles according to the ages. In addition, a system for integrated management of taxi transportation should be established to improve the working environment of older taxi drivers. Systematic approach is necessary to alert taxi drivers to the fatal consequences of traffic violations and to make them to comply with the traffic rules. Application: The effects of the significant variables on deaths and violations can be used as a guideline to develop systematic measures for prevention of accidents for the taxi drivers.