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커플링제 및 점토가 목분/폴리에틸렌 복합체의 물성에 미치는 영향
박병섭(Byung Sub Park),김대수(Dae Su Kim) 한국고분자학회 2011 폴리머 Vol.35 No.2
최근 목분/플라스틱 복합체(WPC)가 많은 관심을 끌고 있다. 본 연구에서는 커플링제 및 나노점토가 함유된 목분/폴리에틸렌(PE) 복합체 패널을 용융혼합 후 압축 성형하여 제조하였다. 5 종의 말레산무수물 그래프트 폴리에틸렌(MAPE) 커플링제에 대해 시험하여 가장 우수한 커플링제 및 함량을 결정하였다. WPC의 기계적 특성은 UTM으로, 열적 특성은 TGA, DMA, DSC, TMA로 측정하였다. 유기점토를 소량(1 phr)만 첨가하여도 WPC의 인장강도 및 굴곡강도, 결정화도가 증가하는 경향을 보였으며 저장탄성률과 치수안정성은 크게 증가하였다. SEM으로 분석한 결과 커플링제에 의한 목분/PE 계면결합력 향상 효과가 매우 큼을 알 수 있었다. 최적의 커플링제를 선정하여 함량을 최적화 하고 소량의 유기점토를 첨가함으로써 우수한 성능의 목분/PE 복합체를 제조할 수 있었다. Wood plastic composites (WPCs) are attracting a lot of interest recently. In this study, wood flour/polyethylene (PE) composites panels comprised of a coupling agent and nanoclay were prepared by melt-blending followed by compression molding. Five maleic anhydride grafted polyethylene (MAPE) coupling agents were tested, and the best choice and its optimum content were determined. The mechanical properties of the WPCs were measured by UTM, and the thermal properties were measured by TGA, DMA, DSC, and TMA. Adding just a small amount (1 phr) of organoclay made the tensile and flexural strength and the crystallinity of the WPC somewhat increase and the storage modulus and dimensional stability of the WPC largely increase. SEM images showed that the coupling agent drastically improved wood flour/PE interfacial bonding. Selecting the best coupling agent optimized content and adding a small amount of organoclay resulted in a high performance wood flour/PE composite.
일부 대학생의 방사선이용에 대한 지식, 의식도 및 태도
한은옥,박병섭,Han, Eun-Ok,Park, Byung-Sub 대한방사선방어학회 2005 방사선방어학회지 Vol.30 No.4
방사선 안전문화가 생활화 될 수 있도록 시대적 환경에 부합되는 방사선안전에 대한 전 국민적 인식 전환이 필요하다. 일반인 중 사회여론 형성에 적극적이고 지식수준이 높은 대학생을 중심으로 방사선이용에 대한 지식, 의식도 및 태도를 파악하여 방사선이용에 대한 올바른 정보제공을 위한 교육프로그램에 필요한 시사점을 도출하고자 하였다. 일부 대학생 528명을 대상으로 2005년 10월 10일부터 10월 15일까지 설문조사를 실시하였다. 방사선이용에 대한 교육을 받지 않은 경우 415명(80.7%), 교육을 받지 못한 이유로는 '교육 기회가 없어서' 265명(77.9%)으로 높은 빈도를 보였다. 방사선 이용에 대한 기초지식은 총 점 15점을 만점으로 전체 $5.96{\pm}2.90$점으로 낮게 나타났고 방사선이용에 대한 의식도는 평균 5점을 만점으로 전체 $3.65{\pm}0.50$점으로 나타났으며 방사선이용에 대한 태도는 평균 5점을 만점으로 전체 $3.23{\pm}0.46$점으로 나타났다. This study attempts to extract certain directions for the education program to provide right information by investigating knowledges, consciousnesses, and attitudes of some university students. They have a high level of knowledges among average persons on the use of radiations in order to recognize the radiation safety in daily lives including the change in national recognitions for radiations safety that is consistent with the situation in these days. The survey was performed for 528 university students from Oct. 10 to Oct. 15, 2005. The results of this survey can be summarized as follows; students who didn't get educations for the use of radiations were recorded as 415 students (80.7%) in which the reason that they didn't get such educations was there were no chances to receive the education' as 265 students (77.9%). The basic knowledge on the use of radiations was presented as a low level of $5.96{\pm}2.90$ points based on the sum of 15 points, and the consciousness on the use of radiations was investigated as $3.65{\pm}0.50$ points based on the sum of 5 points. In addition, the attitude on the use of radiations was investigated as $3.23{\pm}0.46$ points based on the sum of 5 points.
임규성(Kyu Sung Rim),신도영(Do Young Shin),박충기(Chung Ki Park),박병섭(Byung Sub Park),임현석(Hyun Suk Rim),김우중(Yoo Joong Kim) 대한소화기학회 1987 대한소화기학회지 Vol.19 No.1
The authors encountered two male patients with Gilberts syndrome, confirmed by calory deprivation test, light and electron microscopy. Liver biopsy specimens, obtained from all patients, revealed followings. Hepatocytic architectures are altered and there is a varing degree of smooth endoplasmic reticulum increase as with vescular dilatation. The electron dense irregularlly shaped granules resembling lipofuscin granules are scattered. The canaliculi are not dilated and microvilli are preserved.
이경용(Kyung Yong Lee),임규성(Kyu Sung Rim),김우중(Woo Joong Kim),이일준(Il Jun Lee),박병섭(Byung Sub Park) 대한소화기학회 1988 대한소화기학회지 Vol.20 No.2
Dieulafoys lesion, also known as exulceratio simplex and submucosal arterial malformation is a rare cause of massive gastrointestinal hemorrhage. The entity was first described in 1884 by Gallard and later characterized by the French surgeon George Dieulafoy in 1896. The lesion appears to be a large tortuous submucosal artery which usually develops in the stomach and ruptures for reasons not well understood. Surgical intervention has been the therapy of choice in most reported cases. We report a case in which endoscopic ethanol injection was used successfully in the management of this lesion.
이동현(Lee, Dong Hyun),신문권(Shin, Moon Kwon),김은미(Kim, Eun Mi),손승용(Son, Seong Yong),박병섭(Park, Byung Sub),한귀영(Han, Gui Young),윤기준(Yoon, Ki June) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
The conical fluidizing system of a binary mixture of Geldart C powders and Geldart A particles was defined as the conical powder-particle fluidized bed. We used a cold conical powder-particle fluidized bed model having a 0.104m-I.D. and 0.6m-high with an apex angle of 10? for fluidization of a binary powder-particle mixture of 50 vol% fine carbon black powders (HI-900L, Korea Carbon Black Co.) and coarse alumina particles (90{mu}m) under different superficial gas velocities (0-0.1 m/s). The differential bed pressure drop increases with increasing gas velocity, and it goes from zero to a maximum value with increasing or decreasing gas velocity. In the conical fluidized beds of fine powders, demarcation velocities of the partial fluidization, full fluidization, partial defluidization was not observed.
병원형태별 방사선과 서비스에 대한 임상실습생들 인식정도 비교분석
박병섭 김천대학교 2004 김천대학교 논문집 Vol.25 No.-
This study was conducted by analysis of questionnaire. The respon-dents were a student apprentice in university medical center. general hospital and sub general hospital. The questionnaire was composed of 6 categories and 26 items. Data extraction and analysis method used in this study was SPSS/PC+ (ver. 10,0) program 343, 150 and 21 students trained in uni-versity medical center. in general hospital and in sub general hospital, respectively. The questionnaire items were conducted ANOVA testand the results were as follows: 1. In question of "degree of clearance at radiography room", most of respondents were answered "clear", but the degree of clearance was dif-ferences within hospital size. 2. In question of "The exact management of radiography equipment”, respondents were answered more good in general hospital than universi ty medical center or sub generalhospital. 3. In question of "The radiotechnologist of interested in research", most of them took interest in his field, but radiotechnologist of general hospital were showed most interestin his field, 4. In question of "kindness care for patients", most of respondents were answered "kindness", but relatively lower in university medical center.
FILTER의 두께, 위치 및 energy에 의한 線量變化
박병섭 김천대학교 1990 김천대학교 논문집 Vol.11 No.-
The auther studied to dose distribution according as filter thickness and filter-dosimeter distance and energy. In order to decrease to radiation exposure dose influential to patient. Results through the study are as follows. 1. The dose decrease the more when low energy than high energy 2. The dose decrease when 40 cm between filter and dosimeter than contact of it. 3. When filter thickness in thick, dose showed rapid attenur-tion.