바닥내장재의 연소특성 분석에 관한 연구

박영주,이해평,김현주,Park. Young-Ju,Lee. Hae-Pyeong,Kim. Hyun-Ju 한국방재학회 2010 한국방재학회논문집 Vol.10 No.3

In this study, we analyzed the combustion characteristics of four different floor covering materials(wood, monorium, laminatedpaper, and varnish-laminated paper) with regard to their ignitibility, thermal characteristics and flame retardancy by using an ignition temperature tester, a dual cone calorimeter, a thermogravimetric analyzer and limited oxygen index, for their fire risk assessment. According to the result, monorium had the lowest ignition temperature of <TEX>$325^{\circ}C$</TEX> and the laminated paper and the varnish-laminated paper promptly ignited before 7s. Further, the wood showed the largest total heat release of <TEX>$100MJ/m^2$</TEX>, and the varnish-laminated paper showed the highest peak heat release rate. From the thermogravimetric analysis, it was shown that all specimens underwent rapid weight loss at <TEX>$300{\sim}400^{\circ}C$</TEX>. The limit oxygen indices of the laminated paper and the varnish-laminated paper were in the range of 20~21%, while it was 34% for wood. This study enabled us to confirm that wood, laminated paper and varnish-laminated paper have a relatively short ignition time and are easy to burn but they all have low heat release. In contrast, wood showed the lowest fire risk among them and had excellent flame retardancy but with high heat release. 본 연구에서는 건축물 내장재 가운데 바닥재의 화재특성을 평가하기 위하여 목재, 모노륨, 장판지, 니스코팅 된 장판지 등 4종의 바닥재를 대상으로 콘칼로리미터, 발화온도시험기, 열중량분석기, 한계산소지수시험기 등을 이용하여 착화성, 발열특성, 난연성과 같은 연소특성을 분석하였다. 모노륨은 발화온도가 <TEX>$325^{\circ}C$</TEX>로 가장 낮았으며, 장판지와 니스코팅 된 장판지는 비교적 빠른 시간인 7초 이전에 착화가 시작되었다. 총열방출량은 목재가 <TEX>$100MJ/m^2$</TEX>로 가장 높게 나타났지만 최대열방출율은 니스코팅된 장판지가 가장 높은 것으로 나타났다. 열중량분석 결과, 모든 바닥재들이 <TEX>$300{\sim}400^{\circ}C$</TEX> 온도구간에서 급격한 중량감소를 보였으며, 한계산소지수는 장판지와 니스코팅 된 장판지가 20~21% 정도이고 목재는 34%로 나타났다. 본 연구결과를 살펴보면, 모노륨, 장판지, 니스코팅 된 장판지는 착화가 빠르고 연소가 용이한 반면, 발열량은 낮은 것을 알 수 있었으며, 목재는 비교적 착화위험성이 낮고 난연성은 좋지만 발열량이 높은 것으로 나타났다.

가토골수에서 유래된 골모세포의 하악골 결손부 이식시 골형성에 미치는 효과

박영주,남정훈,김보균,전민수,정재안,이정원,안장훈,강태인,박미희,임성철,Park, Young-Ju,Nam, Jeong-Hun,Kim, Bo-Gyun,Jeon, Min-Su,Chung, Jae-An,Lee, Jung-Won,Ahn, Jang-Hoon,Gang, Tae-In,Park, Mi-Hee,Lim, Sung-Chul 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.4

Purpose: The purpose of this experiment was to evaluate the clinical effect of cultured autoglogous osteoblasts as a way to treat the defect of mandible in rabbits. Materials and Methods: Twelve rabbits were used to determine the rate of osteogenesis. The osteoblasts were obtained from the iliac crest of rabbits using aspiration. They were then cultured in Dulbecco's Modified Eagles's Medium (DMEM) with beta-glycerophosophatate, L-ascorbicacid, and dexamethasone to proliferate and differentiate osteoprogenitor cells. The expression of osteogenic markers were detected by reverse transcription-polymerase chain reaction (RT-PCR) and silver nitrate staining techniques. Five, 10-mm holes were placed in each rabbit mandible to simulate defective regions with the use of a low speed trephine bur. In the experimental group, the previously cited defects were grafted with both activated osteoblastic and autogenous bone. The control group, however, was only grafted with autogenous bone. Both groups were then analyzed at 2, 4, and 8-week intervals using bone histomorphometric analysis. Results: According to histomorphologic analysis, the rates of new bone formation at the 2, 4, and 8-week intervals were 36%, 51%, and 23% for the control group, respectively; 52%, 39%, and 28%, for the experimental group, respectively. The experimental group showed higher rates of new bone formation compared to the control group at both the 2-week and 8-week interval. Conclusion: Bone marrow-derived osteoblasts seems to be a promising bone graft material.

청폐사간탕(淸肺瀉肝湯)의 혈소판 응집억제 작용에 대한 in vitro 연구

박영주,김슬지,양가은,이미정,이지숙,강덕희,김영찬,이우경,류재환,Park, Young-Ju,Kim, Seul-Ji,Yang, Ga-Eun,Lee, Mi-Jung,Lee, Ji-Sook,Kang, Deok-Hui,Kim, Young-Chan,Lee, Woo-Kyung,Ryu, Jae-Hwan 대한한방내과학회 2010 大韓韓方內科學會誌 Vol.31 No.4

Objective : The study was designed to test the anti-platelet effect of the extract Cheongpyesagan-tang and compare it with aspirin in vitro. Methods : The extract from Cheongpyesagan-tang was made by the pharmacy department of Kyung Hee Oriental Medical Hospital. The extract was investigated for inhibition against the collagen induced aggregation of human platelet suspensions on aggregometry. Aspirin and aspirin-Cheongpyesagan-tang were investigated together. Results : 1. In collagen induced human platelet aggregation test, the extract from Cheongpyesagan-tang significantly inhibited in concentration 30mg/ml (p<0.05), 40mg/ml, 50mg/ml (p<0.001) and the effect depended on concentration over 20mg/ml. 2. Aspirin and aspirin-Cheongpyesagan-tang inhibited collagen induced human platelet aggregation significantly (p<0.001). Aspirin-extract of Cheongpyesagan-tang inhibition rate was higher than aspirin only (p<0.05). Conclusions : The extract of Cheongpyesagan-tang has anti-platelet aggregation and synergic effect with aspirin on human platelet in vitro.

가토의 골수 세포에서 분화된 골모세포의 골 형성에 혈소판 농축 혈장이 미치는 효과: 조직 형태학적 분석

박영주,신진업,정재안,전민수,김보균,송준호,연병무,임성철,강태인,Park, Young-Ju,Shin, Jin-Eob,Chung, Jae-An,Jeon, Min-Su,Kim, Bo-Gyun,Song, Jun-Ho,Yeon, Byong-Moo,Lim, Sung-Chul,Gang, Tae-In 대한악안면성형재건외과학회 2007 Maxillofacial Plastic Reconstructive Surgery Vol.29 No.6

Purpose: The effect of platelet-rich plasma(PRP) on osteogenesis of marrow-derived osteoblasts on histomorphometric analysis in the mandible of rabbit was assessed. Materials and Method: Bone marrow cells were obtained from iliac bone of rabbits and were cultured in a Dulbecco's Modified Eagle's Medium(DMEM) with Dexamethasone, L-Ascortic acid, ${\beta}$-Glycerophosphate to proliferate and differentiate into osteoblasts for $4{\sim}5$ weeks. The expression of osteogenic mar-kers was detected by reverse transcription-polymerase chain reaction(RT-PCR) and silver nitrate stain. Then we prepared bony defects in the mandible of rabbit, 10.0mm in diameter and 4.0mm deep, by trephine bur. In the control group, the defects were filled with autogenous bone and cultured osteoblasts. In the experimental group, the defects were filled with autogenous bone, cultured osteoblasts and PRP. 2 weeks, 4 weeks, 8 weeks later, each group was evaluated with histological and histomorphometric analyses. Results: In vitro, osteoblasts were identified on RT-PCR and silver nitrate stain. According to histological observation, at 2 weeks well-developed anasto-mosing newly-formed woven bone was observed, at 4 weeks anastomosing newly-formed woven bone having osteoblastic activation was observed, and at 8 weeks thick newly-formed woven bone was observed in both control and experimental groups. According to histomorphometric analysis, there were 1.5% more newly-formed bone volume in experimental group than control group at 2 weeks, 28.4% more at 4 weeks, 4.3% more at 8 weeks. Particularly there were significant differences in bone volume at 4 weeks and 8 weeks new bone. Conclusion: Our results demonstrated PRP may enhance osteogenesis of marrow-derived osteoblasts at 4 weeks, 8 weeks.

하악 후구치 삼각부에 발생한 후천성면역결핍증 관련 카포시육종: 증례보고

박영주,남정훈,노경록,방은오,김다영,김준현,정재안,신진업,강응선,Nam, Jeong-Hun,Park, Young-Ju,Noh, Kyung-Lok,Pang, Eun-O,Kim, Da-Young,Kim, Jun-Hyun,Chung, Jae-An,Shin, Jin-Eob,Kang, Eung-Seon 대한구강악안면외과학회 2009 대한구강악안면외과학회지 Vol.35 No.3

There are several oral lesions related with AIDS, such as candidiasis, hairy leukoplakia, Kaposi's sarcoma, aphthous stomatitis, lichen planus, and other opportunistic infectious diseases. Among the others, Kaposi's sarcoma, the most common malignant tumor associated with AIDS, is closely linked to the number of CD4+ T cell. Kaposi's sarcoma often occurs in palate, the most prone site, and has characteristic clinical features in most cases. Sometimes, the tumor induces underlying bone destruction at late stage. We report a case of a 27 year-old man with AIDS-associated Kaposi's sarcoma at left lower retromolar triangle, parapharyngeal area and discuss the management of AIDS patients in dentistry.

산불에 따른 참나무의 화염확산 메커니즘 규명 및 화재조사에 관한 연구

박영주,이해평,Park,Young-Ju,Lee,Hae-Pyeong 한국방재학회 2011 한국방재학회논문집 Vol.11 No.6

본 연구에서는 참나무류를 대상으로 산불에 따른 화염확산 메커니즘과 화재조사를 고찰하였다. 측정 장비로는 콘칼로리미터와 발화온도시험기를 이용하였다. 부위별 무염착화가 진행된 온도범위는 생엽의 경우, <TEX>$346{\sim}382^{\circ}C$</TEX>, 가지 <TEX>$375{\sim}494^{\circ}C$</TEX>, 수피 <TEX>$396{\sim}473^{\circ}C$</TEX> 온도 구간에서 수종별 차이가 있었고, 함수율이 높은 생엽은 무염착화위험성이 상대적으로 높은 것을 확인할 수 있었다. 또한, 발염착화가 진행된 시간을 살펴보면, 생엽 67초, 가지 203초, 수피 23초로서 함수율이 현저히 낮은 수피부위는 빠른 시간에 발염착화 되었으며, 착화 후 가장 오랜 시간 화염이 지속되는 것을 알 수 있었다. 총열방출량은 생엽의 경우 <TEX>$18{\sim}53MJ/m^2$</TEX>, 가지부위 <TEX>$41{\sim}80MJ/m^2$</TEX>, 수피부위는 <TEX>$19{\sim}110MJ/m^2$</TEX> 정도 범위에서 수종별 발열량 차이가 크게 다른 것으로 나타났으며, 굴참나무는 부위별 발열량이 비교적 높은 수종인 것을 확인할 수 있었다. 따라서 산불발생 시 굴참나무 군락지는 발열량이 높기 때문에 높은 화재하중에 따른 화재경로를 파악하는데 중요한 단서가 될 수 있을 뿐만 아니라 최대 화재 밀도지역으로 구분하여 화염확산 및 화재강도 예측에 있어서도 유효한 단서가 될 수 있을 것으로 판단된다. In this study, we considered the mechanism of the flame spread and the fire investigation for oaks by forest fire. Cone calorimeter and ignition temperature tester were used as the equipments for this study. The temperature range of non-flame ignition was <TEX>$346{\sim}382^{\circ}C$</TEX> for living leaves, <TEX>$375{\sim}494^{\circ}C$</TEX> for branches, and <TEX>$396{\sim}473^{\circ}C$</TEX> for barks, respectively, which showed the difference by kind of trees. Thus, it was confirmed that the green leaves with high moisture content had relatively high risk of non-flame ignition. Also, the time of flaming ignition was 67 sec for living leaves, 203 sec for branches, and 23 sec for barks measured, respectively. Accordingly, it was confirmed that bark part with very low moisture content was flamingly ignited in a shorter time and its flame persisted for the longest time after ignition. And, it was shown that total thermal emission was <TEX>$18{\sim}53MJ/m^2$</TEX> for living leaves, <TEX>$41{\sim}80MJ/m^2$</TEX> for branches, and <TEX>$19{\sim}110MJ/m^2$</TEX> for barks, which were quite different by kind of trees. Further, it could be confirmed that the oaks was a kind of tree mostly with high thermal emission by part. Thus, it is determined that its community complex has high thermal emission and large fire load so that it can be a critical clue to understand fire path and a useful clue to forecast flame spread and fire intensity by its classification into the area of greatest fire density.

불소화지방산염 첨가에 의한 디팔미토일포스파티딜콜린 / 콜레스테롤 / 불소화계면활성제 베지클의 제조와 물성 측정 연구

박영주,권경옥,김명자 ( Young Ju Park,Kyung Ok Kwon,Myung Ja Kim ) 한국공업화학회 1998 공업화학 Vol.9 No.3

소나무류 수관층 및 지표층의 CO₂/non-CO₂ 배출량 분석 연구

박영주,이해평,백창선,Park, Young Ju,Lee, Hae Pyeong,Baek, Chang Sun 한국안전학회 2015 한국안전학회지 Vol.30 No.1

In this study, we carried out the emissions analysis of CO and $non-CO_2$ for the age-classes of various pine trees(Pinus koraiensis, Pinus densiflora, Pinus rigida Mill., Pinus thunbergii Parl.) to estimate of emission factors of the crown layer and surface layer in the forest fire. We used the thermal characteristic analyzer cone heater and NDIR analyzer in order to measure amount of emission. As a result, the major emissions of Pinus koraiensis were $CO_2$ and $CH_4$ and that of Pinus thunbergii Parl. was only CO. The major emissions of the most of pine trees were NO and $N_2O$. The $CO_2$ emission of Pinus thunbergii Parl. was the highest about as $7.26{\times}10^{-2}{\sim}1.63{\times}10^{-1}g$ and next came Pinus densiflora, Pinus koraiensis, Pinus rigida Mill.. And the CO emission of Pinus thunbergii Parl. was about $5.14{\times}10^{-3}{\sim}6.58{\times}10^{-3}g$ and followed by Pinus densiflora, Pinus koraiensis, Pinus rigida Mill.. The emissions of $CH_4$, NO, and $N_2O$ showed small differences between species and the emission of $CH_4$ was $8.37{\times}10^{-5}{\sim}2.55{\times}10^{-4}g$, and NO was $6.65{\times}10^{-5}{\sim}2.0{\times}10^{-4}g$ and $N_2O$ was $1.42{\times}10^{-4}{\sim}2.09{\times}10^{-3}g$ in all species. Particularly, the emission of Pinus thunbergii Parl. was the highest in all pine trees except $CH_4$.

위축된 치조골에서 치조골 수평 확장술을 이용한 임플란트 이식술에 관한 임상연구

박영주,남정훈,송준호,연병무,노경록,방은오,정재안,신진업,강응선,Park, Young-Ju,Nam, Jeong-Hun,Song, Jun-Ho,Yeon, Byung-Moo,Noh, Kyung-Lok,Pang, Eun-O,Chung, Jae-An,Shin, Jin-Eob,Kang, Eung-Seon 대한악안면성형재건외과학회 2009 Maxillofacial Plastic Reconstructive Surgery Vol.31 No.4

The aim of this study was to evaluate the clinical applicability of a ridge splitting technique for reconstruction of narrowed edentulous alveolar ridges for dental implantation. 41 patients with 47 edentulous areas were included in this study. After corticotomy of a rectangular buccal segment and about 3-4 weeks healing period, the alveolar ridge was splitted, implant was placed. The initial ridge width varied between 2.5 and 7.0mm, average was 3.99mm. 68 dental implants were placed, and the gap between the implants and the bone is filled with various bone graft material, or none. All splitted sites showed sufficient bone volume for insertion of the implants at the moment of implantation. Over 1 year of follow-up period, five implants(7.3%) had mobility in two patients, among them, 2 implants(2.9%) sustained infection and removed. And any other complications were not noted. Our conclussion is that ridge splitting of the narrow edentulous area is a reliable and safe procedure in horizontally deficient ridges.

철도차량용 고무바닥재의 연기발생에 관한 실험적 연구

박영주 ( Young Ju Park ) 한국안전학회(구 한국산업안전학회) 2018 한국안전학회지 Vol.33 No.4

In this study, we have performed the Cone Calorimeter test and Smoke density test in accordance with ISO 5660-1 and ASTM E662 respectively to check the smoke production characteristics of rubber flooring materials for railway vehicle. Early in the ASTM E662 test, more smoke was produced in the flame mode test than non-flame mode test, but later more smoke was produced in non-flame mode test. The correlation(R²) between TSR(Total Smoke Release) by ISO 5660-1 and Ds(Specific Optical Density) by ASTM E662 Flame mode was 0.782. The R2 between TSR by ISO 5660-1 and Ds by ASTM E662 Non-flame was 0.930.