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박성서,정명희,김태운,문현식 한국환경과학회 2021 한국환경과학회지 Vol.30 No.11
The aim of this study was to investigate the plants in Yongjibong Natural Recreation Forest before construction, to provide basic data that can be used for various purposes. The survey was conducted on the planned recreational forest sites from June to September 2020. The numbers of flora are summarized as follows: 348 taxa, 95 families, 234 genera, 308 species, three subspecies, 30 varieties, and seven forma. The Korean endemic plants were of nine taxa, including Fagus engleriana, Celtis choseniana, and Broussonetia x kazinoki. The rare plants were of six taxa, including Juniperus chinensis var. sargentii, Hylotelephium ussuriense, Thuja orientalis, and F. engleriana; however, Juniperus chinensis var. sargentii, H. ussuriense, T. orientalis, and Iris ensata var. spontanea were planted species. The floristic regional indicator plants (unique plants) found in this survey area were of 33 taxa, comprising three taxa of grade V, four taxa of grade IV, nine taxa of grade III, four taxa of grade II, and 13 taxa of grade I. The naturalized plants were of 26 taxa, including Rumex crispus, Phytolacca americana, and P. esculenta. Among the naturalized plants, it is necessary to prevent the spread of Ambrosia trifida, Bidens frondosa, and Tagetes minuta through continuous monitoring.
[論文] 흡배기 관내의 비정상 유동을 고려한 4사이클, 4기통 전기·점화 기관의 성능 예측에 관한 연구
박성서(S.S.Park),김응서(E.S.Kim) 한국자동차공학회 1991 오토저널 Vol.13 No.6
In this study, the analytic investigation of the unsteady flow in the intake and exhaust pipes has been carried out using the method of characteristics in one direction to predict volumetric efficiency. Based on the calculated volumetric efficiency, three zone predictive analysis using Wiebe function was applied to predict the engine performance and the results were compared with experiment. Mixture in the cylinder is subdivided into three zones during combustion process in this analysis; adiabatic core zone, thermal boundary layer zone and unburned zone. In each zone, pressure, temperature and gas composition have been calculated.<br/> In conclusion, it is possible to take account of the intake and exhaust pipe tuning effect in predicting the engine performance, by the analytic solution of the unsteady flow in the pipes, and comparison of prediction with experimental results shows a good agreement on the pressure variation in the intake and exhaust pipes which has a direct influence on the volumetric efficiency and performance of the engine.
특수학교에 근무하는 특수교사의 개인적 변인에 따른 공감피로와 공감만족 수준 분석
강호연,박성서,한아름,남광현,서효정 공주대학교 특수교육연구소 2020 특수교육논집 Vol.24 No.2
이 연구의 목적은 특수학교에 근무하는 특수교사의 배경 변인(성별, 연령, 학력, 교육경력, 과정, 담임여부 및 담임교사일 경우 학생 수)에 따른 공감피로와 공감만족의 수준을 알아보고자 하였다. 이를 위해 대전광역시, 인천광역시, 강원도, 충청도에 소재하고 있는 특수학교에 근무하고 있는 특수교사를 대상으로 설문지를 배부하여 146부를 최종 분석에 활용하였다. 연구 결과, 첫째, 공감피로 영역에서 이차 외상성 스트레스는 성별 변인에서 통계적으로 유의미한 차이를 보였다. 구체적으로 남자 특수교사보다 여자 특수교사가 장애가 있는 학생에게 이차 외상성 스트레스를 더 잘 경험한다는 것으로 나타났다. 둘째, 소진과 공감만족 부분에서는 배경 변인에 따라 통계적으로 유의미한 부분은 없었다. 이러한 연구 결과를 종합해보면, 특수학교에 근무하는 특수교사의 이차 외상성 스트레스는 성별 변인에 있어서만 통계적으로 유의미한 차이를 보이고, 다른 배경 변인에 의한 차이나 소진에 있어서는 차이를 보이지 않았다. 실제로, 산출된 점수는 평균 25.59(SD=5.60)이었고, 특수학교에 근무하는 모든 특수교사는 이와 비슷한 점수인 평균 수준으로 공감피로를 느끼고 있다. 따라서 특수교사의 심리적 어려움을 덜기 위해서는 법적, 제도적 차원의 지원이 필요하고, 공감만족을 높일 수 있는 다른 방안들이 강구되어야 할 것이다. The purpose of this study was to compare compassion fatigue and compassion satisfaction by individual variables(gender, age, level of education, teaching experiences, grade levels, and the number of students in each classroom) of special education teachers in special schools. For this, surveys of compassion fatigue and compassion satisfaction were collected from 146 teachers in special-education school in Dajeon, Incheon, Kangwondo and Chungcheongnamdo province, and the results were analyzed through t-test and F test. First, secondary traumatic stress of compassion fatigue was statistically different by gender. Specifically, female special educators had more empathy to students with disabilities than male teachers did. Second, burnout and compassion satisfaction were not statistically different by participantsʼ personal variables. Seeing from the above results, all special teachers in the special schools had psychologically compassion fatigue. Thus, there are urgent needs for legal and institutional supports in order to minimize mental difficulties of special teachers. In addition, other active ways to raise special educatorsʼ compassion satisfaction should be provided.
냉간 아이들시 Cam Phasing 최적화에 의한 배출가스 저감에 관한 연구
김완호(Wanho Kim),박성서(Sungseo Park),최병남(Byungnam Choi) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The fuel and spark control of gasoline engines at cold idle is a dominant factor to meet the exhaust emission regulations being reinforced recently. The engine control of cold idle phase has to be optimized to get low emissions enough to meet the regulations and good stability customers are satisfied with. In this study, we improved engine stability and reduced exhaust emissions by optimizing cold idle cam phasing after engine start.
김치경(Chikyoung Kim),박성서(Sungseo Park) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
Onboard diagnosis of the leakage of the evaporative emission control system is mandatory as an OBD-Ⅱ requirement for the cars in USA. The diagnosis is performed using either a vacuum or pressure strategy. The pressure-based method is more reliable, but has a concern of an attendant emission during the diagnosis. Therefore, the vacuum-based method is used increasingly although it has lower signal-to-noise ratio. This study investigates the influence of the parameters such as fuel level in the fuel tank, fuel temperature, atmospheric pressure and fuel vapor pressure, affecting the reliability of the vacuum-based diagnosis and suggests the solutions to improve the onboard diagnosis of the leakage of the evaporative emission control system.
EHC 기반 Urea-SCR 시스템 히터 표면온도 분포의 1-D 모델링
박선홍 ( Sunhong Park ),손지현 ( Jihyun Son ),문석수 ( Seoksu Moon ),오광철 ( Kwangchul Oh ),장성욱 ( Sungwook Jang ),박성서 ( Sungsuh Park ) 한국분무공학회 2022 한국액체미립화학회지 Vol.27 No.1
In upcoming Post Stage-V and Tier 5 regulations of construction machineries, nitrogen oxide (NOx) emissions are strictly limited in cold start conditions. In response to this, a method of improving NOx conversion efficiency has been applied by installing an electric heating catalyst (EHC) in front of conventional urea-SCR systems so that the evaporation and thermal decomposition of urea-water solution can be promoted in cold start conditions. In this strategy, the evaporation and thermal decomposition of urea-water solution and corresponding NOx conversion efficiency are governed by temperature conditions inside the EHC. Therefore, characterizing the temperature distribution in the EHC under various operating conditions is crucial for the optimized operation and control of the EHC in Urea-SCR systems. In this study, a 1-D modeling analysis was performed to predict the heater surface temperature distribution in EHC under various operating conditions. The reliability of prediction results was verified by comparing them with measurement results obtained using an infrared (IR) camera. Based on 1-D analysis results, the effects of various EHC operation parameters on the heater surface temperature distribution were analyzed and discussed.