자극제 사용 미분쇄 플라이애쉬 모르타르의 강도증진에 관한 실험적 연구

배수환,최광윤,정재동 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

The purpose of this study is for the active use of the fly ash, which is a by-product of the combustion pulverizes coal thermal power plants, it should be used to compensate for the lack of landfill and for conservation of energy as the supplementary cementitious material, and to prove its possibility as the related products of the cement. First of all, the ordinary fly ash is ground in a special method and its fineness is controlled from 4000cm²/g to 6000 cm²/g, then replaced it with the 20% to 80% of the cement mortar to test of the physical properties. The first experiment is about the slow development of the strength of the fly ash mortar in early ages, and improves its strength with the activator Na2SO4, using a large amount of fly ash. On the other hand, in case of adding activator with steam curing, it rather shows the decrease of strength. This is that it needs to consider the influence by high temperature.

네트워크 상에서의 실시간 물류정보관리에 대한 설계

배상현,오창윤,양성기,최길환,이광옥 조선대학교 지역사회발전연구원 1999 地域發展硏究 Vol.3 No.1

본 논문은 네트워크를 이용하여 인터넷 상에서 물류정보관리를 실시간으로 설계하고 이를 구현하고자 한다. LIS에서는 현재 도로수송에 편중된 화물운송 구조를 모델로 철도, 해운, 항공 등으로 물류정보 시스템망을 효율적인 정보시스템을 구축하여 크게 기업과 개인을 구성된 고객집단과 물류운송을 담당하는 운송회사 또는 화물운속조합으로 구성된 운송자 집단들 사이의 신속하고 효율적인 정보 제공을 통한 최적의 물류의 흐름을 담당하는 물류관리 설계를 목표로 하고 있다.

압자의 압입에 의한 치관 전장용 복합레진의 기계적 성질 평가

최원호,배태성,박광선,박종수 대한치과기재학회 2001 대한치과재료학회지 Vol.28 No.2

This study was performed to evaluate the mechanical properties of four commercially available veneering resin composites for crown (Dentacolor: DC, Artglass: AG, Esternia: ET and Targis: TG). According to the manufacturer's instructions, disc specimens were fabricated in a teflon mold giving 12mm in diameter and 1 mm in thickness. All specimens were immersed in distilled water at 37℃ for 30 days. An indentation test of 68-degree trigonal diamond pyramid was made under 98.06 mN load for 15 seconds. Hardness numbers, charateristic indentation depths, flow and permanent deformation were measured and compared statistically by ANOVA and Tukey's multiple range test. The results obtained were summarized as follows; 1.The highest hardness value of 87.4 was observed in the ET group and the lowest value of 11.8 was observed in the DC group. Hadness values showed no sinificant difference between the AG group and TG group, but others showed the significant difference beween groups (p<0.5). 2.Flow value of the ET group was significantly lower than those of the AG and TG groups of hybrid composite for crowns. 3.Percent strain during the indentation was the lowest in the DC group and the highest in the AG group, but there was no significant difference in each experimental group (p>0.05). 4.The relationship between the hardness number and flow during the indentation was a negative linear on a logarithmic scale.

FGR 환경설비 시스템 보일러의 성능 및 배기 배출물에 미치는 재순환 배기의 영향

배명환,정광호,최승철 慶尙大學校 經營行政大學院 2004 工學硏究院論文集 Vol.20 No.-

The effect of recirculated exhaust gas on performance and exhaust emissions with FGR rate are investigated by using a natural circulation, pressurized draft and water tube boiler with FGR system operating at several boiler loads and over fire air(OFA) damper openings. The purpose of this study is to apply the FGR system to a power plant boiler for reducing NO_(x) emissions. To activate the combustion, the suction damper of two stage combustion system installed in the upper side of wind box is opened by handling the lever between 0˚ and 90˚, and the OFA with 0 to 20% into the flame is supplied, as the combustion air supplied to burner is reduced. It is found that the fuel consumption rate divided by evaporation rate does not show an obvious tendency to increase or decrease with rising the FGR rate, and NO_(x) emissions are decreased, at the same OFA damper opening, as FGR rates are elevated and boiler loads are dropped. While a small quantity of soot is emitted without the operational conditions of boiler load, OFA damper opening and FGR rate, because soot emissions are eliminated by the electrostatic precipitator with a collecting efficiency of 86.7%.

방사선학적 치근단병소의 크기와 특징에 대한 치근단낭종 및 육아종의 상관관계연구

최호식,이우철,손원준,금기연,배광식,백승호 大韓齒科保存學會 2010 Restorative Dentistry & Endodontics Vol.35 No.1

The purpose of this study was to find out the relationship of radiographic lesion size, gender, age of patients and radiographic character to the diagnosis of periapical cyst and granuloma. The data was collected from 187 periapical lesions of 167 patients who undergone apical surgery at Department of Conservative Dentistry, Seoul National University Dental Hospital from 2003 to 2005. The lesion were surgically removed and send for biopsy to the Oral Pathology Laboratory. From the initial radiograph, lesion size was calculated using PiViweSTAR (INFINITT, Korea) program. The obtained data were statistically evaluated using SPSS (p<0.05). The result were as followings: 1. From 187 biopsy samples, the incidence of periapical cyst was 28.34% and granuloma was 65.24%. 2. There was a significant correlation between periapical cyst and the size of radiographic lesion (p<0.01). 3. There were no significant correlations between age, gender, location of lesion and the final diagnosis (p>0.05). 4. There was a significant correlation between the non-demarcation of the lesion and the incidence of periapical granuloma (p<0.01). 본 연구는 2003년부터 2005년까지 서울대학교 치과병원 보존과에 내원한 환자 중 치근단수술을 시행한 환자 167명에서 생검을 위해 적출한 187개의 치근단병소를 대상으로 하였다. 수술 후 조직검사 결과 얻은 진단명과 환자의 진단기록에서 환자의 성별, 나이, 발병 부위, 방사선 사진 상의 특징 그리고 병소의 크기와의 상관관계를 조사하였다. 초진시 방사선 사진에서 치근단병소의 크기를 PiViewSTAR (INFINITT, Korea)를 이용하여 화소를 계산함으로써 면적을 구하였다. 이를 바탕으로 통계 분석프로그램 SPSS (version 12.0K, SPSS Inc., Chicago, IL, USA)를 이용해 방사선사진상 크기와 진단명과의 상관관계를 조사하였다. 나이와 진단명과의 상관관계는 일원배치 분산분석을 시행하고 성별, 부위, 방사선사진상의 특징과 진단명과의 상관관계는 교차분석을 통해 카이제곱검정으로 조사하여 다음과 같은 결론을 얻었다. 1. 187의 치근단병소 조직검사결과 치근단병소 중 치근단낭종의 비율은 28.34%, 육아종의 비율은 65.24%, 기타병소의 비율은 6.42%로 나타났다. 2. 방사선사진상 병소의 크기가 커질수록 치근단 낭종일 확률이 높았다(p<0.01). 3. 나이, 성별, 발병부위와 진단명사이에서 유의 한 상관관계가 없었다(p>0.05). 4. 병소의 경계가 명확하지 않은 것과 치근단육아종의 발생빈도는 통계적으로 유의한 상관관계를 보였다(p<0.01).

원위피판과 이개연골을 이용한 외이재건치험례

최광배,민대홍,윤진호,김승홍 大韓成形外科學會 1982 Archives of Plastic Surgery Vol.9 No.2

The auricle, diverging from the side of the head, consists of a delicate shell of elastric cartilage between the anterior and posterior of the thin skins. Thus, a radiacl chage in the outlook for the results of ear reconstruction has occured in recent years due to the delicate anatomical specificity. Inspite of the challenge of the many plastic surgeons, successful resconstruction of acquired defects may be extrimely difficult or impossible- especially, in patients who have suffered total traumatic loss of the auricle in which the local soft tissues are destroyed or deeply scarred. We experienced the case of total auricular loss with severe periauricular abrasion and dirty tattooing, and can obtained successful total ear reconstuction using buried cartilage and the distant flap.

재생골재를 사용한 콘크리트의 특성에 관한 실험적 연구

최광윤,배수환,정재동,김한철,최영화 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

The purpose of this experiment is an experimental study on recycling of waste concrete and suggest a possibility of the Recycled Aggregate Concrete after establishing some kinds of experimental properties of concrete. Therefore, this study compared and investigated properties of natural aggregate concrete and recycled aggregate concrete by replacing the ratio of recycled aggregates under the absorptions, compressive strengths and chemical resistances. As the result, the compressive strength and the chemical resistance of Recycled Aggregate Concrete is lower than the natural aggregate concrete. If was concluded that the properties of the recycled aggregates and lower than natural aggregates.

폐쇄성 수면무호흡증 진단을 위한 두부규격 방사선사진 계측 분석에 의한 한국 성인 정상교합자의 정상치에 관한 연구

박광호,김경호,최희수,허종기,배진성 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.1

Purpose : The lateral cephalometric Korean norms of the skeletal and pharyngeal dimension were analyzed for the diagnosis of obstructive sleep apnea syndrome(OSAS). Materials and Methods : The lateral cephalometric radiographies were taken in male(n=53) and female(n=50), who had a normal profile, class I occlusion, normal ANB (0∼4˚) and normal Wits Appraisal(-4∼0mm). The X-rays were traced by two oral and maxillofacial surgeons twice. The significant differences between male-female and examiners were tested. Results : The angle of mandibular line to Nasion-Sella line was 31.12˚/33.79˚(in male/in female, p=0.0018). The lower Gonion angle was 73.74˚/73.74˚(p=0.9978). The length of the soft palate was 36.93mm/34.35mm(p=0.0002). The pharyngeal airway space was 13.42mm/11.55mm at mandibular plane level(PAS(ML))(p=0.0025). The hyoid was placed inferiorly to mandibular plane 10.18mm/7.72mm(p=0.0051). The results from this study are to be used for the diagnosis of OSAS.

한국인에서 혈소판 당단백 Ⅲa 유전자 다형성과 급성 관동맥 증후군의 관계

김광일,채인호,김효수,손대원,오병희,이명묵,박영배,최윤식,이영우 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.5

노인 환자에서 경피적 관동맥 중재술 후 조영제 유발 신부전의 발생률, 위험인자와 임상적 의의

김광일,배장환,강현재,채인호,김효수,손대원,김철호,오병희,이명묵,박영배,최윤식 대한노인병학회 2004 대한노인병학회지 Vol.8 No.1