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유연체 모델을 이용한 디젤엔진 크랭크트레인의 동응력 해석
김현규(Hyeonkyu Kim),성원석(Wonsuk Sung),황원걸(Won-gul Hwang),김헌수(Heonsoo Kim),안기원(Kiwon An),김기세(Kisei Kim),곽성순(Sungsoon Kwak),송의선(Euiseon Song) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Flexible multi body dynamics model was used to calculate reactions and dynamic stresses on a cranktrain which are difficult to measure during early stage of development. Rigid model for V12 engine cranktrain with components connected by kinematic constraints was transformed into a flexible model by replacing rigid crankshaft and connecting rods with flexible ones. To secure the credibility of flexible body model, three kinds of flexible model were tried, ie, a model with a whole length of crankshaft, with a segment (1/6 of the whole) of crankshaft, and a segment model with finer meshes. The results from each model were compared, and a segment model with finer meshes was found to give reasonable stress values within relatively short period of computing time. More realistic dynamic displacement and dynamic stress were calculated to help better prediction of endurance, safety and vibration in an early stage of development.
촉매형 탄산가스발생기를 이용한 탄산시비 시 시설 내 대기환경 변화
이선진 ( Seonjin Lee ),성원석 ( Wonsuk Sung ),정필수 ( Pilsoo Jeong ),박동욱 ( Donguk Park ) 한국농업기계학회 2022 한국농업기계학회 학술발표논문집 Vol.27 No.2
CO2 Enrichment plays a key role in a greenhouse for yield and plant quality. This study deals with variation of atmosphere in the greenhouse during CO2 enrichment by a catalyst-type CO2 generator and it generates 0.36 kg/h. There are Alstromeria in a inner-greenhouse which was set in a main greenhouse for prevent damage from cold. The CO2 generator turned on at every 5:30 a.m and turned off at every 12:30 p.m. And inner-greenhouse was opened among 8:00 a.m ~ 9:00 a.m manually. The window of main greenhouse was opened when temperature in greenhouse was above 20 ℃ automatically. CO2 concentration increased to about 700 ppm, and then sharply decreased under 400 ppm after opening the inner-greenhouse. Furthermore, at first, the CO2 concentration rose dramatically to ‘some point’ which is near the sunrise, and then rose gently. This phenomenon implies the photosynthesis started on ‘some point’. It means CO2 consumption increased and the ratio between CO2 consumption and generates was change at that point. In addition, the rate of increase in CO2 concentration became more gentle as the experiment progressed. This result imply the amount of photosynthesis increased gradually because of leaves growth.
시설 내 탄산가스 시비 시 시설 대기환경의 변화가 알스트로메리아(Alstroemeria) 생육에 미치는 영향에 대한 고찰
이선진 ( Seonjin Lee ),성원석 ( Wonsuk Sung ),박동욱 ( Donguk Park ),정필수 ( Pilsoo Jeong ) 한국농업기계학회 2022 농업기계공학 Vol.2 No.1
CO<sub>2</sub> fertilization is very critical for plants in a greenhouse because CO<sub>2</sub> is insufficient after sunrise due to the photosynthesis. This study reported the variation of CO<sub>2</sub> concentration in greenhouse and the effect of greenhouse plants on CO<sub>2</sub> fertilization. Alstroemeria were cultivated in CO<sub>2</sub> fertilization greenhouse and non- CO<sub>2</sub> fertilization greenhouse (Control house). To supply CO<sub>2</sub>, we set a catalyst-type CO<sub>2</sub> generator at fertilization greenhouse and it generated 0.36kg/h CO<sub>2</sub>. The CO<sub>2</sub> concentration at CO<sub>2</sub> fertilization greenhouse was maintained about 640 ppm from 6:00 to 10:00. The result reported that CO<sub>2</sub> fertilization significantly increased the weekly yield and shoot length. There was slightly increase at total number of flowers and stem thickness despite of no statistical significance. According to these positive results, we considered that future studies would be aimed at experiments with bigger scale and more details.
촉매형 탄산가스발생기를 이용한 탄산시비 시 시설 내 대기환경 변화
이선진 ( Seonjin Lee ),성원석 ( Wonsuk Sung ),정필수 ( Pilsoo Jeong ),박동욱 ( Donguk Park ) 한국농업기계학회 2022 한국농업기계학회 학술발표논문집 Vol.27 No.2
CO2 Enrichment plays a key role in a greenhouse for yield and plant quality. This study deals with variation of atmosphere in the greenhouse during CO2 enrichment by a catalyst-type CO2 generator and it generates 0.36 kg/h. There are Alstromeria in a inner-greenhouse which was set in a main greenhouse for prevent damage from cold. The CO2 generator turned on at every 5:30 a.m and turned off at every 12:30 p.m. And inner-greenhouse was opened among 8:00 a.m ~ 9:00 a.m manually. The window of main greenhouse was opened when temperature in greenhouse was above 20 ℃ automatically. CO2 concentration increased to about 700 ppm, and then sharply decreased under 400 ppm after opening the inner-greenhouse. Furthermore, at first, the CO2 concentration rose dramatically to ‘some point’ which is near the sunrise, and then rose gently. This phenomenon implies the photosynthesis started on ‘some point’. It means CO2 consumption increased and the ratio between CO2 consumption and generates was change at that point. In addition, the rate of increase in CO2 concentration became more gentle as the experiment progressed. This result imply the amount of photosynthesis increased gradually because of leaves growth.
이은영(Eunyoung Lee),주승원(Seungwon Ju),성원석(Wonsuk Sung),양성대(Sungdae Yang),임형은(Hyung-Eun Im),황원걸(Won-Gul Hwang) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
A fixed-base vehicle simulator is developed. It consists of a real-time vehicle simulation system, a visual and audio system, and an experiment console. The system is designed and constructed with modular structure so that it can be easily extended and updated if necessary. It has three modes to work: real time driving simulation, traffic simulation, and ride quality simulation. It is expected that the proposed low-cost vehicle simulator can be used for the feasibility study of new control algorithms, driver's steering behavior research and ride quality studies.
한방병원에 내원한 척추측만증 환자의 특성에 대한 후향적 연구
강신우 ( Shinwoo Kang ),박현선 ( Hyunsun Park ),박서현 ( Seohyun Park ),성원석 ( Wonsuk Sung ),김은정 ( Eunjung Kim ),금동호 ( Dongho Keum ) 한방재활의학과학회 2022 한방재활의학과학회지 Vol.32 No.1
Objectives This study was conducted to characterize scoliosis patients visiting Korean medicine hospital and to analyze the demands and factors affecting discomfort. Methods This retrospective study analyzed 33 scoliosis patients who visited Korean medicine hospital from March, 2021 to October, 2021. The data analysis consisted of three factors: (1) demographic characteristics, (2) characteristics of demands on Korean medicine (reasons for choosing Korean medical treatment, preferred treatment methods, most uncomfortable part, treatment priorities) and (3) discomfort factors (treatment experiences, diagnosed age and Cobb's angle). Statistical analyses were performed and a p-value≤0.05 was considered to be statistically significant. Results 43.75% of the patients chose ‘effectiveness’ for the reason why they preferred Korean medicine treatment. ‘Chuna treatment’ was the most preferred treatment method. The patients chose ‘lower back’ for the most uncomfortable part and ‘pain’ for the highest priority of improvement. The Cobb's angle of included patients was 16.02±7.65° and it is not much differ to average of Cobb's angle in Korean. Discomfort was more severe in the patients with treatment-experienced than treatment- naive. The score of discomfort in appearance and psychological were higher in the patients diagnosed in childhood or adolescent period than who were diagnosed after adult. Classification based on Cobb's angle showed no statistical difference. Conclusions Not only Cobb's angle but also other clinical factors should be considered for effective treatment in scoliosis. Also, It is necessary to pay attention to adult scoliosis patients. (J Korean Med Rehabil 2022;32(1):63-72)