Flowable composite resin을 이용한 접착식 유지장치의 결합강도와 파절양상에 열순환이 미치는 영향

전재호,손우성 대한치과교정학회 2005 대한치과교정학회지 Vol.35 No.4

이 연구는 flowable composite resin을 이용한 접착식 유지장치를 열순환시킨 후 결합강도와 파절양상을 조사하여 flowable composite resin이 접착식 유지장치의 레진 접착제로서 유용한지를 알아보기 위해 시행되었다. 교정치료를 목적으로 발거한 160개의 치아로 80개의 시편을 제작하고 40개씩 두 군으로 나누어 접착식 유지장치를 제작하였다(Group G: 일반 복합레진인 CharmFil, Group F: flowable composite resin인 CharmFil Flow, wire: Tri-flex). 각 군을 20 개씩 2 개의 subgroup으로 나누었다(Subgroup 24: 생리식염수에 24시간 동안 보관, Subgroup T : 37℃ 생리식염수에 24 시간 동안 보관한 후 5 ± 2℃ ~55± 2℃ 수조에 500회 열순환). 유지장치의 wire 중점에 수직전단력을 주면서 파절되는 순간의 하중을 측정하여 비교하였으며, 광학입체 현미경으로 파절면을 관찰하여 파절양상을 비교하였다. 그 결과, 두 군의 전단결합강도 및 파절양상에는 통계학적으로 유의한 차이가 없었다. 따라서, 전달결합강도와 파절양상의 측면에서만 본다면 flowable composite resin을 유지장치의 레진 접착제로 충분히 적용시킬 수 있을 것으로 본다. The purpose of this study was to evaluate the effects of thermocycling on shear bond strength and mode of failure of orthodontic bonded retainer using flowable composite resin and to ascertain whether the flowable composite resin is useful for use as adhesive for orthodontic bonded retainers. One hundred and sixty freshly extracted human premolars were collected and eighty bonded retainer specimens were fabricated. They were randomly separated into 2 groups (Group G: general composite resin-CharmFil, Group F: flowable composite resin-CharmFil Flow, wire: Tri-flex). Each group was divided into 2 subgroups (Subgroup 24: stored in water at 37℃ for 24 hours for baseline data, Subgroup T: stored in water at 37℃ for 24 hours and thermocycled between 5 ± 2℃ and 55± 2℃ for 500 cycles before testing the in vitro shear bond strength). Shear bond strength was measured and mode of failure was evaluated with a stereomicroscope. There was no statistical difference in shear bond strength and mode of failure between the bonded retainer using general composite resin and flowable composite resin. Therefore, in considering shear bond strength and mode of failure, it is sufficient to use flowable composite resin as resin adhesives for bonded retainers.

불명열 환자에서 진단된 중증 만성 활동성 Epstein-Barr virus 감염증

전경만,김응호,손준성,장현하,정숙인,오원섭,백경란,송재훈,고광철,정철원,고영혜 대한감염학회 2003 감염과 화학요법 Vol.35 No.4

최근 장기적이고 심각한 임상 증상을 유발하는 만성 활동성 EBV 감염증의 개념이 정립되면서 그 증례들이 보고되고 있다. 만성 활동성 EBV 감염증은 소아나 젊은 성인들에게서 주로 발생되며, EBV-VCA IgG, EBV-EA IgG의 수치가 높게 관찰되고, 지속적인 발열, 전신쇠약감, 광범위한 임파선비대증, 간비장비대, 범혈구감소증, 다크론성감마병증을 나타낸다. 이 질환은 환자의 임상소견, 혈액학적 소견, EBV 항체 역가 및 침범 장기의 EBV genome 검출로 확진 되며 치료로 항 바이러스 체제, 항암 치료, 골수이식술 등이 시도되고 있으나 아직 검증되어 있지 않다. 저자들은 불명열을 주소로 내원하여 중증 만성 활동성 EBV 감염증으로 진단된 증례 4례를 경험하였다. 한 례에서는 항 바이러스 제제를 추여 후 임상적, 혈액학적 호전을 보였으나 치료 20일째 발생한 세균성 복막염과 패혈증으로 사망하였고, 두 례에서 총 6회의 CHOP 항암치료와 자가조혈모세포이식을 시행 받은 후 현재까지 증상 없이 추적관찰 중이다. 지속되는 발열을 주소로 내원한 불명열 환자들에게서 EBV에 대한 검사를 시행할 경우 불명열의 원인을 규명하는데 하나의 단서를 제공할 수 있을 것으로 사료된다. Epstein-Barr virus (EBV) is one of eight human herpesvirus. Primary infection with EBV in childhood is generally asymptomatic or mild, however, often causes overt diseases such as infectious mononucleosis (IM) and lymphoproliferative disorder (LPD), the latter occursing in immunologically compromised individuals. Historically, EBV has been considered to be etiologically linked to human malignancies such as EBV genome positive Burkitt's lymphoma and nasopharyngeal carcinoma. Recently, however, another category of EBV-related disease, "chronic active EBV infection", has been made to describe persons without a clearly defined underlying disease. We report 4 cases of patients, presented with episodic fever of unknown origin (FUO), who were diagnosed as severe chronic active EBV infection. A combined application of serology for EBV and in-situ hybridization established the diagnosis of the EBV infection.

체질량지수에 따른 여고생의 영양 섭취에 관한 연구

전재영,김태운,백영호,최문기,이경희 釜山大學校 附設 體育科學硏究所 2006 體育科學硏究所 論文集 Vol.22 No.2

The purpose of this study was to investigate the daily nutrition intake of high school girl students according to the BMI. The subjects of this study were classified into under weight group; UG(<14.9percentile; n=9), normal weight group; NG(15.0~84.9percentile; n=12), and obese group; OG(>85percentile; n=12) by BMI.......

재근관치료를 통한 치근단 병소의 치유

전정훈,이연재,황호길 조선대학교 구강생물학연구소 2002 Oral Biology Research (Oral Biol Res) Vol.26 No.2

The cases of two patients with large periapical lesions are presents. Most of the periapical lesions formed as a result of improper endododtic treatment. Following conservative nonsurgical endododtic retreatment, there was resolution of the periapical lesion and clinical symptom. These results suggest that the sizes of a periapical lesion dose not mandate its surgical removal and even periapical lesions heal fellowing conservative nonsurgical endododtic retreatment.

자은철광석으로부터 희토류광물 회수에 관한 연구

전호석,김준수,문영배,이재장 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.A

The separation of rare earths minerals is verb difficult because of their similar chemical properties. The rare earth minerals are used as the mixed rare earth minerals or the misch metal without separation to each element. However, the high purity rare earths are recently produced commercially to each element so they there are used as the materials for high tech. Based on the characterization results for the raw minerals, we have developed a combined process containing gravity seperation, magnetic severation and flotation. The result obtained from this study is monazite concentration of TREO grade 69.11% and Recovery 56.02%.

쇼핑몰 구축을 위한 IDEF0 업무 프로세스 모델링

전태보,정재호 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.A

Industrial efforts for increased market sales have directed towards the development and implementation of on-line marketing systems under recent e-business environment. Internet-based shopping mall is one of the most popular system. A business process model for an intermediary type shopping mall using IDEFO has been presented in this study. Specific efforts have been focused on defining and analyzing a diversity of business processes embedded in practical B2B and B2C mall system operations. We first briefly examined the considered system with IDEFO design. We then defined fundamental business processes within shopping mall systems. Upon careful examination and analysis of them, a detailed business process model based on IDEF methodology has been designed. The results in this study may well form a conceptual framework for shopping mall development and operations.

全羅北道 道民의 口腔健康實態-(Ⅱ) : 치아보철 장착상태 및 수요를 중심으로 Centered by the status and need of dental prosthetics

전재규,유광호,서봉직 대한구강보건학회 2003 大韓口腔保健學會誌 Vol.27 No.1

The purpose of this study was to collect the basic data about oral health status of residentsin Chollabuk-do Province of Korea. At this province 11 sampling areas were chosen by Board of National Statistics. 5 areas were city areas including capital city of Chollabuk-do and 6 areas were rural ateas. The number of total sampling person was 676 adults aged 18 years old and above. The survey was conducted by individual home-visiting method. The contents of survey were status and need of dental prosthetics. The data were collected and analyzed by SPSS/PC. The obtained results were as follows; 1. The rate of persons wearing any dental prosthetic (fixed and removable partial denture and/or complete denture)was rapidly increased after 35years old. 2. The rate of persons wearing any dental prosthetics was 65.8% at upper jaw and 60.1% at lower jaw in the age group from 65 to74 year old, but 49.0% at upper jaw and 42.9% at lower jaw in the age group more than 75year old. 3. The rate of persons needing complete denture was 8.6% at upper jaw and 5.5% at lower jaw in the age group from 65 to 74year old, but 28.6% at upper jaw and 24.5% at lower jaw in the group more than 75year old.

관상동맥질환자에서 경흉부 도플러 심초음파를 이용한 좌심실 확장기 기능의 평가 : 좌심실 확장기 장애 형태에 따른 분류

전희경,윤호중,유기동,박지원,전두수,정욱성,채장성,김재형,최규보,홍순조 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.1

Communication Overhead 의 觀點에서 본 프로세서 連結綱의 性能 分析

全昌浩,崔在德 成均館大學校 科學技術硏究所 1987 論文集 Vol.38 No.2

Communication overhead reduces the performance of parallel processing systems. The amount of the overhead depends on the degree of matching between the topology of the interconnection network used and the pattern of the data flow during the execution of the given application algorithm. In this paper, a model for the communication overhead incurring in a parallel processing is developed, and three types of interconnection network are compared based on the model. The parallel processing system being considered here is the Multicluster system which belongs to the class of loosely coupled MIMD systems. Assuming that the system is used in image processing applications, histogramming is chosen as the benchmark algorithm. For the three types of network, the tree, the unidirectional ring, and the bidirectional ring, executing the benchmark algorithm, the communication overhead is modeled in terms of the total image size(M), the number of processor clusters(CN), network latency time(T_l), transfer time(T_l), and a probability factor(P_max) which indicates the maximum number of data items to be transferred between processor clusters. The results of simulations show that the performance of the three network depends on both the number of processor clusters and the maximum number of data to be transferred between communicating processor clusters.

양측성 전정장애 환자들의 전정기능검사

이근호,김재일,정필섭,전범석,이광우 대한신경과학회 1996 대한신경과학회지 Vol.14 No.4