지혈제가 상아질과 레진 결합력에 미치는 영향

조정현,이은정,소경모,김원,오남식,한상현,송경화,Cho, Jeong-Hyun,Lee, Eun-Jeong,So, Kyung-Mo,Kim, Won,Oh, Nam-Sik,Han, Sang-Hyun,Song, Kyung-Hwa 대한치과보철학회 2008 대한치과보철학회지 Vol.46 No.4

목적: 산부식제 적용후 치은 자극으로 인하여 지혈제를 사용할 때 다양한 pH를 가진 지혈제를 적용후 pH에 따른 레진 결합력 차이와 산부식제 재적용 여부에 따른 결합력 회복 정도를 비교하는 것이다. 재료 및 방법: 본 실험에서 사용된 지혈제 중 보스민, 아스트리제덴트, 헤모덴트로 대부분의 지혈제는 산도가 낮다. 또한 바이진은 눈의 충혈제거제로써 성분은 중성이다. 실험방법은 먼저 치관이 건전한 90개의 대구치 10개씩 9그룹으로 나눠 교정용 레진에 식립 한 후 치축과 수직으로 섹션 후 연마한 뒤 대조군은 통상적인 방법으로 산부식과 접착제를 도포 하고, 실험군은 산부식한 뒤 각각의 지혈제를 30초간 오염시킨다. 그 뒤 린스만 한 N 그룹과, 린스 후 산부식제 재적용한 R 그룹으로 나누어서 처치하고 처치한 상아질에 셀룰로이드 캡슐을 이용해 레진 접착을 시행한다. 그리고 인스트론을 이용해 전단력을 측정한다. 통계 분석은 유의수준 0.05 이하로 비교했다. 결과: 대조군과 비교하였을 때, Visine을 제외한 모든 지혈제에서 평균 결합력이 낮아짐을 볼 수 있었으나 통계적으로는 유의할만한 차이는 없었다. 또한 린스만 한 N군과 산부식제 재적용한 R군을 비교했을 때 모든 군에서 결합력 증가가 있었으나 통계적으로는 유의할만한 차이는 없었다. 결론: 임상에서 적용하는 30초의 짧은 적용 시간에는 pH에 따른 지혈제의 영향은 결합력에 영향을 줄 만큼 크지 않고 산부식제 재적용 등 다른 처치를 하지 않아도 린스를 하는 것만으로도 충분히 결합력 회복이 가능하다는 결론을 도출하게 되어 임상과정을 간단하게 하는데 도움이 될 것으로 생각된다. Purpose: This study examined the recovery of the dentin-resin bonding strength, and the difference in the bonding strength after applying pH hemostatic agents at various pH. Materials and methods: Bosmin, Hemodent, Astregedent, and Visine were used as the hemostatic agents in this study. The Bosmin, Hemodent, and Astrigedent hemostatic agents are acidic, and the Visine hemostatic agent is neutral and is used as a decongestant. Ninety human molar teeth were used as the specimen. The teeth were sectioned using a diamond wheel until the dentin was exposed and wet ground by silica paper. The specimens were divided into two groups according to the hemostatic agent used. The specimens were then subdivided into 9 groups according to the application of re etching (R group) or rinsing only (N group). A commonly used resin bonding procedure was used in the control group. The resin bonding procedure was managed dentin using celluloid capsule. In addition, the shear bond strength was measured using an Instron. Results: In general, samples with the applied hemostatic agent, with the exception of Visine, had a slightly weak bond that was similar to the control group. In addition, the rinsing only (N) group had slightly weak bond that was similar to the re etching (R) group. Conclusion: The application of a hemostatic agent on the dentin surface does not affect the shear bond strength after application for a short time. In addition, rinsing only can recover the shear bond strength making other management procedures redundant, particularly re etching.

Evaluation of Performance for Shape Extraction using Modified Chain Code and Color Information with Spatial Relationship

조정현,Cho, Jeong-Hyun 한국정보과학회 2004 정보과학회논문지 : 기술교육 Vol.1 No.1

본 논문은 클립아트 이미지로부터 색상정보와 모양정보를 추출한 후에 다른 클립아트 이미지로부터 추출된 색상정보와 모양정렬 사이의 유사성을 측정하는 방법에 대해 제안한다. 클립아트 이미지의 모양정보를 표현하기 위해서, 제안된 방법은 사각형의 비율을 이용해서 외각선을 오목면과 볼록면의 비율로 표현한다. 모양의 외각선은 사각형으로 표현되고 체인 코드로 변환한다. 반면에, 색상은 HSV 색상 좌표계로 양자화된 간 색상 영역사이의 위치 정보 그리고 색상 영역사이의 크기로 표현된다. 이 색상정보는 자연 이미지보다 적은 칼라수를 가지는 클림아트를 표현하는 데 있어 보다 나은 정확성을 갖는다. 실험 결과는 모양과 색상을 표현하는 데 있어 이전에 연구되었던 방법보다 제안된 방법이 우위에 있음을 보여준다. This paper presents a method of extracting shape and color information from clipart images, then measuring the similarity between different clipart images using the extracted shape and color information. To represent the shape of clipart images, the proposed method expresses the convex and concave aspects of an outline using the ratio of a rectangle. The shape outline is then expressed using a rectangle representation and converted into a chain code. Meanwhile, the color is represented by color values quantized into HSV color coordinate, the location information between the color regions and the size of the color regions. These color information can more appropriate for representing clipart images, which have a smaller number of colors than nature images. Experimental results demonstrated that the proposed method is superior in expressing shape and color information than previous methods.

코하우징 계획을 위한 주민참여 워크숍 사례 - 30~40대 주부를 대상으로 -

조정현,최정신,Cho, Jeong-Hyun,Choi, Jung-Shin 한국가정관리학회 2009 가정과삶의질연구 Vol.27 No.6

Resident participation plays much of a rule to the cohousing, which is organized independently and has the characteristics of community life, especially in the initial state of cohousing process. However, it is hard to realize the resident participation in proper order due to lack of a personal time, individual effort and an insufficient knowledge related with cohousing. So, it is thought that the guidance of cohousing expert and coordinator is needed to enable the residents to perform in an active attitude. The development of educational program and workshop connected with resident participation is also accompanied. In this study, to make the positive and systematic participation of cohousing residents, we established the workshop program and performed workshop with our developed program, based on preceding researches and examples. We selected the object of workshop as five housewives in thirties and forties. Workshop was consisted of six process steps. (1) Introduction and question of workshop and cohousing (2) examining and arranging the opinion (3) Master plan of cohousing village (4) Planning of common living space (5) Planning of individual living space (6) Analysis of final results and evaluation of workshop. The workshop held six times and it took about five~six hours per each meeting. Workshop participants expressed their opinion actively and attended in a positive manner in order to the design of their desired village and cohousing. During workshop process, the players established the common target of their village by means of life card, target card game. Also, based on the common target, the layout of village was planned using a collage game and card arrangement game. By workshop activity, the members started to recognize the significance of participation on the drawing board and improve their technique of communication and decision-making. Furthermore, workshop process made it possible to approach the concrete forms of their cohousing village. Especially, in the closing phase, the participant satisfaction about workshop and cohousing is increased suddenly and expressed their intention to join the real workshop related with cohousing.

주거가치에 따른 코하우징 거주의사에 관한 연구

조정현,홍서정,곽유미,곽인숙,최정신,Cho, Jeong-Hyun,Hong, Seo-Jung,Kwak, Yu-Mi,Kwak, In-Sook,Choi, Jung-Shin 한국주거학회 2007 한국주거학회 논문집 Vol.18 No.5

This is a basic study to investigate possibility to application of cohousing model into Korea. Purpose of this study is to grasp respondents' housing value, and its influence on intention to live in cohousing. Research method used for this study was a social survey. Respondents were 214 married people residing in Seoul and its outskirts by accidential sampling. The collected data were analyzed by SPSS 12.0 program using frequency, mean, average, factor analysis, t-test, one-way ANOVA, Duncan's multiple range test, multiple regression and legit analysis. Result of this study was as follows. Housing values were classified into three categories named as individualism oriented housing value, tradition oriented housing value, and economy oriented housing value. Housing values were different by respondents groups. For example, individualism oriented housing value showed difference according to age and housing area. Tradition oriented housing value showed difference according to sex, occupation, and period of residence, while economy oriented housing value showed difference according to housing type, and home ownership. In detail, men than women, single-income family than double-income family, and detached house resident than flat resident had higher tradition oriented housing value. The younger than the elder, and Seoul resident than outskirts resident had higher economy oriented housing value. Also home owner than tenant, and the higher tradition oriented group had stronger intention to live in cohousing than others.

미국 코하우징의 특성 및 주민참여 현황

조정현,최정신,Cho, Jeong-Hyun,Choi, Jung-Shin 한국주거학회 2011 한국주거학회 논문집 Vol.22 No.2

Since the cohousing idea, originated in Northern Europe, was introduced in the U.S. by architects Kathryn McCamant and Charles Durrett in the early 1980s, there are recently the largest number of cohousing communities and rapidly expanded in the U.S. So, it is necessary to appreciate the cohousing communities developed in U.S. In this study, we investigated the physical characteristics of cohousing and the methods of its residents' participation by means of a case study on cohousing communities in U.S. and suggested the future direction of the cohousing community. Also, this work could be exploited when the cohousing is introduced to Korea. At first, the general status and characteristics of U.S cohousing was explored using diverse sources such as literature, paper and Web site. And then, the direct visit survey was used to obtain the more exact and specific data about physical aspects and residents' participation in each community. We found that cohousing communities were mostly located in the urban and Rural area, which was founded in the 1990s, and new communities continue to be created in the U.S. Typically, the number of households is from 20 to 30 in one community. The land is generally owned by the community itself and its size is within 10 acres. Communities usually serve optional group meals in the common house at least two or five times a week. Each member's income is separated and the community members should take care of their common properties. The leader of community does not exist and most communities don't have the organization of community members. All cohousing communities use consensus as the basis for group decision-making.

증례 : 순환기 ; 인공 심박동기 시술로 치료한 Atrial standstill 1예

조정현 ( Jung Hyun Cho ),안연정 ( Yeon Jeong Ahn ),윤성은 ( Seong Eun Yun ),정영훈 ( Young Hoon Jeong ),최봉룡 ( Bong Ryong Choi ),황진용 ( Jin Yong Hwang ),곽충환 ( Choong Hwan Kwak ) 대한내과학회 2010 대한내과학회지 Vol.78 No.1

본 증례는 가족력 및 다른 특이 질환이 없는 환자에서 발생한 지속성 atrial standstill을 영구적 인공 심박동기를 시술하여 치료하였기에 이제까지 국내에서는 증례보고가 없는 바 문헌고찰과 더불어 보고하는 바이다. Persistent atrial standstill is an extremely rare arrhythmia that was first described by Chavez et al. Electrocardiographically, atrial standstill is characterized by bradycardia, the absence of a P wave, and a junctional narrow complex escape rhythm. Atrial standstill is usually classified into two types. The transient type is observed in drug intoxication, such as with digitalis or quinidine, and hyperkalemia. The persistent type is uncommon, often accompanied by syncopal attacks or brain embolism. We report a case of persistent atrial standstill in an 83-year-old man who was treated with implantation of a permanent pacemaker. (Korean J Med 78:109-112, 2010)

도시공간구조 분석에 관한 연구 -진주시를 사례로-

조정현 ( Jeong Hyun Cho ),이창학 ( Chang Hak Lee ),백태경 ( Tae Kyung Baek ) 한국지리정보학회 2011 한국지리정보학회지 Vol.14 No.4

본 연구는 기존 구도심부 상업지역의 공동화로 인한 쇠퇴현상이 나타나고 있어 현 시점에서 진주시의 도시공간구조를 살펴보고자 하였다. 도시공간구조 분석의 범위는 구득자료의 한계와 연구의 목적을 감안하여 진주시의 동지역으로 한정하였다. 진주의 도시공간구조를 밝히기 위하여 다변량해석(Multivariate Analysis)을 사용하여 분석한 결과 7개의 지역(중심지, 공업지, 일반주거지 등)으로 유형화할 수 있었다. 진주시는 장래 낙후된 도시이미지의 쇄신, 서부경남의 중심도시로의 부활을 위해서는 앞서 지역별 현상을 감안하여 도심 노후지역의 전면적인 도심재개발, 재건축사업 및 재정비촉진사업 등이 필요할 것으로 보이며, 상평공단 이전 및 초장동 일원과 연계한 신도시 건설, 현재 계획 중인 혁신도시의 차질 없는 추진이 필요할 것으로 판단된다. This study analyzed the urban structure of Jinju city where urban doughnut phenomena, development of new town at suburban zone and establishment of innovation city appear. The sphere of this study was set limit to Jinju`s dong area due to taking the limitation of data. Multivariate analysis was done by using 24 variables to classify into seven clusters(CBD, Industrial Area, Residential Area etc). We studied regional condition and problems at the relation between analyzed regional features of this study and development principles at the upper planning. Jinju city needs urban redevelopment, reconstruction works and redevelopment promotion project for urban outworn zone in view of the regional conditions to innovate outdated city image and restore western Gyeongnam as a central city and also they should promote innovative city that is progressing now and construction of new town that is linked with Sangpyeong industrial complex removal as well as the whole Chojang-dong zone. In conclusion, this study will help to understand regional phenomenon like regional development project and urban management.

방범 관제를 위한 실시간 원격 모니터링 엠비언트 시스템 개발

조정현(Cho, Jeong Hyun),권용진(Kwon, YongJin) 한국통신학회 2010 한국통신학회 학술대회논문집 Vol.2010 No.6

비평면 양력면 이론과 반복적 캠버변형 기법을 이용한 날개의 실속 특성 예측

조정현(Jeong-hyun Cho),조연우(Yeon-woo Cho),조진수(Jin-soo Cho) 한국항공우주학회 2006 韓國航空宇宙學會誌 Vol.34 No.10

본 연구에서는 3차원 날개의 실속 특성을 예측하였다. 날개의 실속 특성을 해석하기 위해 반복적 캠버변형 기법을 비평면 양력면 이론에 도입하였다. 반복적 캠버변형 기법은 기지의 2차원 에어포일 데이터를 이용하여 3차원 날개의 실속 특성을 해석한다. 날개의 한 단면에서의 캠버변형이 날개의 다른 단면에 미치는 영향은 다차원 뉴턴 반복법을 사용하여 고려하였다. 해석 결과는 실험값과 타 전산해석 결과와 비교하여 일치되는 결과를 보였다. 본 기법은 비틀림 또는 조종면을 갖는 어떠한 날개에도 적용이 가능하며 또한 날개와 날개의 상호 작용이 있을 때의 실속 특성도 예측 가능하다. This paper predicts the stall characteristics of three-dimensional wings. An iterative decambering approach is introduced into the nonplanar lifting surface method to take into consideration the stall characteristics of wings. An iterative decambering approach uses known airfoil lift curve and moment curve to predict the stall characteristics of wings. The multi-dimensional Newton iteration is used to take into consideration the coupling between the different sections of wings. Present results are compared with experiments and other numerical results. Computed results are in good agreement with other data. This scheme can be used for any wing with the twist or control surface and for wing-wing configurations such as wing-tail configuration or canard-wing configuration.

공압부양 고속 지상운송체의 비정상 공력해석

조정현(Jeong-hyun Cho),조진수(Jin-soo Cho) 한국항공우주학회 2008 韓國航空宇宙學會誌 Vol.36 No.8

경계요소법을 이용하여 비평면 지면 위를 움직이는 공압부양 고속 지상운송체의 비정상 공력해석을 수행하였다. 비정상 공력해석을 위하여 시간전진법과 이에 연계한 자유후류를 도입하였다. 공압부양 고속 지상운송체가 채널 내를 움직일 때, 채널에 갇힌 공기에 의해 지면효과가 증가하여 운송체의 양력계수와 피칭모멘트 계수가 더욱 증가한다. 즉, 채널과 같은 비평면 지면은 운송체의 종방향 불안정성을 증가시킨다. 반면, 채널과 같은 비평면 지면에 의한 양력상승이 운송체 탠덤날개의 왼쪽과 오른쪽에 동일하게 발생하기 때문에 채널과 같은 비평면 지면효과가 운송체의 횡방향 안정성에 미치는 영향은 크지 않다. Unsteady aerodynamic analysis of an air-pressure-levitated high-speed ground vehicle moving over the nonplanar ground surface are performed using the boundary-element method. The potential flow solution is included in a time-stepping loop and the wake is captured as part of the solution. When the vehicle moving inside the channel, the lift coefficient and the pitching moment coefficient of the vehicle are increased further because the air trapped by the channel increases the ground effect. In other words, the nonplanar ground surface such as the channel decreases further the longitudinal stability of the vehicle. On the other hand, there is little difference between the ground and the channel in the lateral stability of the vehicle because the lift increment due to the nonplanar ground surface such as the channel takes place on both sides of the wing with the same rate of increase.