접합면의 차이에 따른 두개골 외판의 생존

박성근,송중원,한기환,강진성,박관규 大韓成形外科學會 1991 Archives of Plastic Surgery Vol.18 No.3

Onlay graft of the calvarial bone has been popularized in craniofacial surgery because absorption of the calvarial bone is less than that of the endochondral bone. But the problems with using the calvarial bone are its rigidity and difficulty in setting a precise apposition. When the outer tables of the calvarial bone are used for augmentation and reconstruction of the convex zygoma, forehead, or chin, it is better to place the cancellous surface over the convex recipient bone to get a precise apposition. Whereas, it is better to place the cortical surface over the concave nose or orbital cavity to achieve a good apposition. Therfore, our study was designed to determine the differences of bone absorption and regeneration between cancellous and cortial bone contact to facial bone, and between preserved periosteum and detached periosteum in autograft of calvarial bone in dog models. Outer tables of the calvarial bone were placed in subperiosteal pockets of the upper and lower maxilla in four different ways : Group I ; The cancellous surface was placed in contact with the bare recipient bone, and the cortical surface attached with periosteum was accordingly contacted with the elevated periosteum of the recipient bone. Group Ⅱ ; The corical surface attached with periosteum was placed in contact with the bare recipient bone and the cancellous surface was contacted with the elevated periosteum of the recipient bone, Group Ⅲ ; The arrangenent was similar to Group Ⅰ except that the periosteum of the graft was deprived. Group Ⅳ ; The arrangement was similar to Group Ⅱ except that the periosteum of the graft was deprived. Volume measurements using a caliper technique and histological study were made 20 weeks postoperatively. The volume of maintenance is as follows ; Group Ⅰ, 84.2% ; Group Ⅱ, 77.6% ; Group Ⅲ, 77.0%, and Group Ⅳ, 69.5%. The histolgical contribution of living bone was assessed by a modified point counting technique : Group Ⅰ, 86.6%, Group Ⅱ, 83.8% ; Group Ⅲ, 79.6% and Group Ⅳ, 77.6%. Greater volume maintenance and histological contribution of living bone were found when cancelllous surface rather that the cortical were placed in contact with the recipient bone and the grafts from their periosteum were preserved. We concluded that in order to expect better survival of a grafted bone, the cancellous surface of the graft should contact with the recipient bone and that the periosteum of the graft should be preserved.

Protein microarray를 이용한 Apin-단백질의 상호작용에 관한 연구

박주철,박선화,김흥중,박종태,윤성호,김지웅,이태연,손호현 대한치과보존학회 2007 Restorative Dentistry & Endodontics Vol.32 No.5

법랑모세포 분화와 성숙과정에서 OD314의 발현

박주철,안성민,김흥중,정문진,박민주,신인철,손호현 大韓齒科保存學會 2005 Restorative Dentistry & Endodontics Vol.30 No.5

법랑모세포는 법랑질을 형성하고 유지하는 세포로, 법랑질의 유기기질을 분비하고 법랑질 석회화 과정에도 관여한다. 치아 발생과정에서 법랑모세포의 분화는 순차적인 상피-간엽 상호작용에 의하여 조절되나, 분화나 성숙과정의 정확한 기전은 아직까지 잘 알려져 있지 않다. 최근에 상아모세포에서 처음 발견된 OD314가 치아 발생과정에서 상아질을 형성하는 상아모세포 뿐 아니라 법랑모세포에도 발현된다고 하였다. 이에 본 연구에서는 생쥐 하악 전치의 다양한 시기의 법랑모세포를 이용하여, 형태학적 분석과 in-situ hybridization에 의한 OD314 mRNA의 발현 그리고 OD314 항체를 이용한 면역조직화학적 분석을 통하여 OD314 유전자의 법랑 모세포 분화와 성숙과정에서의 역할을 연구하여 다음과 같은 결과를 얻었다. 1. 형태학적으로 법랑모세포는 분화 단계에 따라 분비 전단계 법랑모세포, 분비기 법랑모세포, 성숙기의 평탄끝 법랑모세포와 성숙기의 주름끝 법랑모세포로 구분되었다. 2. OD314 mRNA는 분비기의 법랑모세포에서부터 발현되기 시작하여 법랑모세포가 성숙해갈 수록 그 발현이 증가하였다. 3. OD314 단백질은 분비 전단계의 법랑모세포에서는 발현되지 않고, 분비기의 법랑모세포에서는 세포질에 전체적으로 발현되었다. 성숙기의 평탄끝 법랑모세포와 주름끝 법랑모세포에서는 세포의 근심과 원심끝단에 OD314 단백질이 강하게 발현되었다. 이상의 결과를 종합하여 OD314는 법랑모세포의 분화와 성숙과정에서 세포질 내부에서 특징적인 역할을 하는 것으로 사료된다. Ameloblasts are responsible for the formation and maintenance of enamel which is an epithelially derived protective covering for teeth. Ameloblast differentiation is controlled by sequential epithelial-mesenchymal interactions. However, little is known about the differentiation and maturation mechanisms. OD314 was firstly identifled from odontoblasts by subtraction between odontoblast/pulp cells and osteoblast/dental papilla cells, even though OD314 protein was also expressed in ameloblast during tooth formation. In this study, to better understand the biologcal function of OD314 during amelogenesis, we examined expression of the OD314 mRNA and protein in various stages of ameloblast differentiation using in-situ hybridization and immunohistochemistry. The results were as follows : 1. The ameloblast showed 4 main morphological and functional stages referred to as the presecretory, secretory, smooth-ended, and ruffle-ended. 2. ○D314 mRNA was expressed in secretory ameloblast and increased according to the maturation of the cells. 3. OD314 protein was not expressed in presecretory ameloblast but expressed in secretory ameloblast and maturative ameloblast. OD314 protein was distributed in entire cytoplasm of secretory ameloblast. However, OD314 was localized at the proxiamal and distal portion of the cytoplasm of smooth- ended and ruffle-ended ameloblast. These results suggest that ○D314 may play important roles in the ameloblast differentiation and maturation.

좌심방 석회화와 관련된 반복된 좌심방 혈전 1예

김성훈,우성용,오유경,정우백,임철현,신재원,박철수,윤호중,정욱성,홍순조 대한순환기학회 2004 Korean Circulation Journal Vol.34 No.3

주파수 응답 함수를 이용한 평면 밀링에서의 채터 예측

홍성욱,박중윤,김현수,박재현,박창용 金烏工科大學校 産業技術開發硏究院 1999 産業技術開發硏究 Vol.15 No.-

The present paper investigates the chatter stability of a milling spindle-workpiece system in face milling process. To this end, a new method using frequendy response function is adopted for predicting the chatter vibration. A compliant workpiece is used to make the spindle-workpiece system easily exposed to chatter vibration. The entire experimental procedure, including measurement of frequency response function and cutting coefficients, is demonstrated. The experimental result shows that the chatter stability prediction method using frequendy response function is of great use in face milling process.

24주간 추적하는 임상 연구에서 한국인 남자 알코올 의존 환자의 비재발률

강철중,김성곤,남궁기,조동환,이병욱,최인근,최용성,박성봉,제영묘,김현경,김성연 大韓神經精神醫學會 2006 신경정신의학 Vol.45 No.1

Objetives : In order to provide useful data tbr the further clinical studies with Korean alcohol-dependent patients, enrollment and non-relapse rates were investigated while alcohol-dependent patients wcre followed up for 24 weeks. Methods : The subjects of this study were alcohol-dependent male patients who, for the first time, visited a hospital among 3 groups of hospitals, University Hospital, General Hospital or Mental Hospital, or those who needed to be followed up after discharge from those hospitals. After assigning 12 subjects to each hospital, we investigated enrollment and non-relapse rates while cognitive-behavioral therapy and pharmacotherapy were provided. Results : 1) Forty-eight patients were enrolled and the rate of enrollment was 36.4%. The enrollment rate in the University Hospital group was 52.1%, in the General Hospital group 50.0%. and in the Mental Hospital group 10.4%. 2) In 48 patients, non-relapse rate was 27.1% at 12 week and 18.8% at 24 weeks after starting follow-up. It was 24.4% and 20.0% at 12 and 24 weeks, repectively, in the University Hospital group while the General Hospital group showed 33.3% and 16.7%, respectively, and the Mental Hospital Group showed 20.0% at both 12 and 24 weeks. Conclusion : These results provide important data for further clinical studies of Korean alcohol-dependent patients.

부분적으로 일정한 자기장의 영향을 받는 보의 동적해석에 관한 연구

홍성욱,박중윤 金烏工科大學校 1992 論文集 Vol.13 No.-

This paper presents the dynamic analysis of a beam subjected to a piecewise uniform magnetic field. The objective of this study is to test the applicability of a passive magnetic damper in the suppression of structural vibration. The fundamental idea of the passive magnetic damper is that a moving conductor experiences viscous damping force when subjected to a magnetic field, due to internal current loss induced by electromotive force. The dynamic equation of the system is formulated by using the Green function method and finite element modeling technique. Simulation of the system is also performed to discuss the pros and cons of the passive magnetic damper in the suppression of a beam vibration.

찻물에서의 Cd과 Pb 이온 제거에 관한 차입자의 효과

김중만,백승화,박성수 한국식품영양학회 1998 韓國食品營養學會誌 Vol.11 No.5

차재료를 찻물에 담근 후 차건데기를 건저내고 마시는 차류의 중금속 제거력을 조사하기 위하여 Cd과 Pb 용액에서 보리차, 옥수수차, 쟈스민차, 현미녹차, 홍차, 결명자차, 감껍질차, 귤껍질차, 누룽지의 입자별, 농도별, 온도별 제거 정도를 조사한 결과는 다음과 같다. 입자의 크기가 작아질수록 모든 차에 있어서 중금속 제거력은 증가되었고, 금속별 제거량은 Cd는 결명자차(3.253∼6.136㎎/g)가, Pb은 쟈스민차(6.784∼7.557㎎/g)가 높았다. 농도별 중금속 제거량은 중금속의 농도가 증가할수록 증가하였는데 Cd와 Pb는 쟈스민차(1.209∼4.815㎎/g, 0.642∼7.004㎎/g)가 제거력이 높았다. 농도별 중금속의 제거작용은 모든 차류에서 증가되었으나 옥수수차는 Pb에서 0.497∼0.647㎎/g로 제일 낮았다. 온도별 중금속 제거량은 온도가 높아질수록 증가하여 Cd은 결명자차가 4.080∼7.799㎎/g, Pb는 쟈스민차가 7.003∼7.763㎎/g으로 증가하는 경향을 보였다. Removabilities of heavy metals(Cd and Pb) by the tea materials (barley-tea, corn-tea, jasmin-tea, brown rice-green tea, cassia tora-tea, persimmon peel-tea, orange peel-tea and rice-tea) in the tea-water were studied in the various conditions ; particle size of tea(20, 40, 70 mesh), concentration of heavy metal(25, 50, 100 ppm) and extraction temperature(20, 30, 50, 100℃). The removabilities by the tea solids were increased as the particle size decreased, concentration of heavy metal increased, and extracting temperature increased. Of the nine kinds of tea, Cd and Pb removability by jasmin-tea was highest. In addition, heavy metal removability by cassia tora tea was better than that of other tea as extraction temperature was increased.

이온교환법에 의한 고분자전해질형 연료전지용 전극의 제조와 특성 고찰

이주성,박수길,오태영,이홍기,심중표 한양대학교 에너지.환경기술연구소 1995 에너지·環境技術論文集 Vol.2 No.-

고분자전해질형 연료전지용 전극의 백금 이용률을 높이기 위해 촉매제조시 이온교환법을 이용하여 백금을 carbon에 담지하고 이에 따른 전지성능변화를 고찰하였다. 전극제조시 Nafion이 첨가되지 않은 경우 이온교환양이 증가함에 따라 전기화학적인 활성이 증가하여 전지성능이 증가하였다. 전극제조시 Nafion이 첨가된 경우, Nafion첨가량이 증가함에 따라 전지성능은 증가하였는 데 Nafin첨가에 의해 이온교환되지 않은 백금이 전기화학적인 활성을 가지게 되어 전지성능은 증가하였다. To improve platinum utilization of PEMFC(Proton exchange membrane fuel cell) electrode, in preparing catalytic powder, platinum was impregnated on carbon by ion exchange method and its cell performance was investigated. When electrode was prepared without adding Nafion solution, as Nafion pre-impregnated amount was increased, electrochemically active area and cell performance was increased. When electrode was prepared with Nafion solution, increase of adding Nafion amount was improvement of cell performance. By adding Nafion at preparation of electrode, non ion-exchange platinum was shown electrochemical activity, cell performance was improved.

초등학교 화단에 대한 교사들의 인식과 운영실태에 관한 연구

김오성,정연옥,박중춘 韓國植物ㆍ人間ㆍ環境學會 2001 인간식물환경학회지 Vol.4 No.3

The purpose of this study was to provide basic data for inquiring effective use of school garden by researching the recognition and practical management on school garden of elementary school teachers. The teachers recognized that school garden was contributing to students' emotional cultivation, cultural learning and feeling on importance of life. The more teaching career recognized that school garden was a great help to students on learning attitude. The teachers recognized that the garden structure and plants, planting design were in harmony. Teachers have more than 31 teaching years recognized that they knew kinds of plants in school garden well. The more teaching career were more interest in practical classes in school garden. When panting trees or flowers in a school garden, teachers thought their opinions were considered well. Especially female teachers in thirties and having teaching career between 11 years and 20 years recognized that acceptance degree of their opinions was very high. Most of teachers recognized that they knew considerably the name of plants in school garden, especially female teacher and the lower career teacher were so.