도망층이 글라스 아이오노머 시멘트의 결합강도에 미치는 영향

최영운,김교한,김영진 大韓小兒齒科學會 1992 大韓小兒齒科學會誌 Vol.19 No.2

상아질 표면 거칠기, 도말충, 표면처리제 효과 등이 글라스 아이오노머 시멘트의 유치 상아질에 대한 결합력에 미치는 영향을 알아보고자 표면 거칠기 측정, 결합 강도 측정, 표면 처리 후 및 결합 강도 측정 후 파단면 표면 양상을 관찰한 결과 다음과 같은 결과를 얻었다. 1. 표면 거칠기는 대조군 carbide bur 마무리 군, diamond bur 마무리 군 순으로 거칠게 나타났으며 (P<0.05), 표면처리네 처리시 전체적으로 표면이 평활해 졌으나, 역시 같은 순서의 거칠기를 보였다. 2. 글라스 아이오노머 시멘트의 상아질에 대한 결합 강도는 diamond bur로 마무리한 군에서 가장 낮았으며 (P<0.05), 600 grit silicone carbide paper와 표면 처리제를 함께 사용한 군에서 가장 높게 나타나 (P<0.05), 표면이 거칠수록 결합 강도가 낮아지는 경향을 보였다. 3. 마무리 술식 후 상아질 표면 양상은 diamond bur 마무리 군에서 표면 굴곡이 가장 심하고, 많은 양의 도말층이 관찰되었으며, 모든 군에서 표면 처리제 처리시 굴곡이 완만해지고 도말층이 제거되었으나, smear plug는 남아 있는 양상을 보였다. 4. 시편 파절면 양상 관찰 결과, 결합 강도가 클수록 응집성 파정을, 작을수록 부착성 파절의 양상을 나타내었다. The purpose of this study was to evaluate the effects of the dentin surface roughness, smear layer and surface conditioner on the bond strength of a glass ionomer cement in dentin of primary teeth. So, the surface roughness after various treatment, tensile bond strength, and surface texture of dentin surface before and after fracture were examined. The result of this study were as follows : 1. The surface roughness valre was the highest in diamond bur group, next came the carbide bur group, control group (P<0.05). By the treatment of surface conditioner, the roughness values were deacreased in the same order. 2. The tensile bond stregth was the lowest in diamond bur group (P<0.05). and the highest in 600 grit silicone carbide paper and conditioner treated group (P<0.05). And, the rougher the dentin surface, the lower the bond strength was observed. 3. The dentin surface after finishing procedure, the grinding groves and the smear layer were the most prominent in diamond bur group. And in every group, surface were smoothened and smear layers were removed with the treatment of surface conditioner, but smear plugs were remained. 4. On the fractured dentin surfaces, as the bond strength increased, the more cohesive fracture pattern was examined, and as the bond strength decrease the more adhesive fracture pattern was examined.

대구지역 중소기업의 국제경쟁력 결정요인에 관한 연구

최용호,신진교,김승호,김상표 한국중소기업학회 2002 中小企業硏究 Vol.24 No.4

본 연구에서는 대구지역 중소기업의 국제경쟁력의 수준과 결정요인을 탐색하고 있다. 대구지역에 소재한 408개 중소기업을 대상으로 자료를 수집 분석한 결과 대구지역 중소기업의 국제경쟁력 수준은 그리 높지 않은 것으로 나타났다. 나아가 중소기업의 국제경쟁력 결정요인에 환한 연구모형의 타당성을 검증한 결과 모형은 타당한 것으로 나타났으며, 특히 경영전략 특성 및 조직구조 특성이 지역 중소기업의 국제경쟁력에 유의한 영향을 미치는 것으로 나타났다. 본 연구가 발견한 특징적인 현상은 지역 중소기업이 국제경쟁력을 달성하기 위해서는 경쟁전략에 있어서는 비용절감추구전략과 제품차별화추구전략을 동시에 높일 때, 그리고 조직구조에 있어서는 분권화와 공식화를 동시에 높일 때 국제경쟁력이 높아진다는 사실이다. 이는 소위 모순경영에 관한 이론적 함의를 제공하는 것으로 본 수 있다. 마지막으로 본 연구결과에 대한 해석과 토론, 이론적 및 실무적인 시사점과 한계점, 그리고 향후의 연구를 위한 연구명제가 제시되고 있다. This study investigated the level and determinants of international competitiveness of small and medium sized firms located in Daegu. The research model consisted of characteristics of management process including management strategy, organizational structure, management system, and top management. And international competitiveness was used as a performance variable. The data were collected from 408 small and medium sired firms located in Daegu. Empirical results indicated that the level of international competitiveness was not high, and management strategy and organizational structure influenced on international competitiveness significantly. Specifically, this study shown that to improve international competitiveness, small and medium sized firms have to persue both cost reduction and product differentiation, and also enhance decentralization and formalization simultaneously. In doing so, they appear to be faced with a paradox management. The implications of these findings, limitations, and future research directions were discussed.

최고경영자, 전략 및 구조요인이 중소기업의 성과에 미치는 영향

최용호,신진교,김승호 한국중소기업학회 2003 中小企業硏究 Vol.25 No.2

본 연구에서는 중소기업의 성과에 대한 최고경영자 특성, 전략 및 조직구조의 영향을 분석하고 있다. 131개 중소기업을 대상으로 자료를 수집·분석한 결과 중소기업의 최고 경영자-전략 및 구조-성과에 대한 연구모형은 타당한 것으로 나타났으며, 최고경영자 특성, 마케팅차별화전략, 분권화 및 계층화가 중소기업의 성과에 유의한 영향을 미치는 것으로 나타났다. 본 연구가 발견한 특징적인 현상은 중소기업이 분권화와 계층화를 동시에 높일 때 성과가 향상된다는 사실이다. 이는 소위 모순경영에 관한 이론적 함의를 제공하는 것으로 볼 수 있다. 또한 중소기업 최고경영자의 특성은 성과에 직접적인 영향을 미치기도 하지만, 전략 및 구조를 통해 간접적인 매개효과도 동시에 지니는 것으로 나타났다. 마지막으로 본 연구결과에 대한 해석과 토론, 이론적 및 실무적인 시사점과 한계점, 그리고 향후의 연구방향이 논의되고 있다. This study investigated the impact of top management, management strategy, and organizational structure on the organizational performance. The data were collected from 131 small and medium sized firms located in Daegu. Empirical results indicated that characteristics of top management, marketing differentiation strategy, decentralization, and stratification influenced on organizational performance significantly. And characteristics of top management have both direct and indirect effect on the organizational performance through management strategy and organizational structure. This study also shown that to improve organizational performance, small and medium sized firms have to persue both decentralization and stratification. In doing so, they appear to be faced with a management of paradox. The implications of these findings, limitations, and future research directions were discussed.

테스팅을 지원하는 설계 방법론과 구현에 관한 연구

최승교,박덕수,이진영 三陟大學校 1998 論文集 Vol.31 No.1

To solve "software Crisis", Software Engineering which adopts the concept of engineering in the development of software has been introduced. Analysis and Design are the most important steps in "Software Life Cycle". If Analysis and Design work properly, development cost, time, and maintenance cost are reduced. Until now, we have many methodologies which test after software developed, but don't have one which test design itself. In this paper, we propose a methodology and diagram to conduct testing in design time. New diagram is very similar to the conventional DFD. The DFD that can be executed is called message Transmission Diagram. All object on the Message Transmission Diagram are to execute independently with data flow converting operations, which makes it easier to find errors of data flow on design. Also, to validate usability of methodology proposed, we implement tol which support new methodology.

소프트웨어 개발 자동화 도구를 위한 다이어그램 형식과 구현

최승교,주영상,이진영 三陟大學校 1998 論文集 Vol.31 No.1

It's getting more difficult to maintain and repair complicated and massive software. In an effort to solve this current "Software Crisis", a technology called "CASE" has been introduced with Software Engineering which adopts the concept of engineering in the development of software. Increasingly bigger-sized CASE tools, however, are being introduced and yet to be completely standardized with the following defects to be corrected. 1. It is difficult to train the users due to the large size of the toos. 2. CASE tools which can generate various diagrams will not have enough information needed for the software development automation unless more than two exclusive diagrams are generated at the same time. 3. Various independent tools are not sufficiently interfaced. Diagram is generally said to be the very core of CASE tools. In this study, such diagrams are presented as new diagrams contracted more efficiently for software automation solving the problems mentioned above. Also it is designed to meet the circumstances in Korea in relation to software development including the use of the Korean letters. And also the tool is to design the program structure at the same time with the diagram creation, which makes it easier to create detailed program structure out of the overall structure for the user's convenience.

DHLF 연구 분석과 개선 방안에 대한 연구

최승교,이진영,주영삼 三陟大學校 1999 論文集 Vol.32 No.1

Accurate branch prediction is essential for obtaining high performance in pipelined superscalar processors that execute instructions speculatively. Some of the best current predictors combine a part of branch address with a fixed amount of global history of branch outcomes in order to make prediction. These predictors cannot perform uniformly well across all workloads because the best amount of history to be used depends on the code, the input data and the frequency of context switches. Consequently, all predictors that use a fixed history length are therefore unable to perform up to their maximum potential. Therefore propdsed a method-called DHLF-that dynamically determines the optimum history length during execution. But this method can not improve performance largely. We propose improving DHLF methods. Firstly, when history length is changed, it is directly set the history length to the one corresponding to the minimum in the misprediction history length. Secondly, we predict GAg predictor instead of gshare. Consequently, improving DHLF can achieve higher performance than existing DHLF.

새로운 LacZ Gene Fusion 및 Gene Cartridge Vector의 개발에 관한 연구

박교선,이영훈,박충웅,최창진 圓光大學校 基礎自然科學硏究所 1987 基礎科學硏究誌 Vol.6 No.2

In this study, a new lacZ gene vector, plasmid PGEM3-lacZ was constucted, which could be used for the study of the gene regulation and the function of proteins. Plasmid pMC1871 was digested with restriction endonuclease Pst I and Sma I to obtain a DNA fragment with the lacZ-gene(3091 bp). Recombinant plasmid pGEM3-lacZ was constructed by inserting the lacZ gene DNA(Pst I-Sma I cut DNA; 3091 bp) of pMC1871 into the Pst I and Hinc Ⅱ sites of plasmid pGEM3. After then, Recombinant plasmid pGEM3-lacZ DNA was transformated into E. coli HB 101. pGEM3-lacZ DNA/HB 101 was screened on the NZY plate with ampicillin and X-gal(5-Bromo-4-Chloro-3-Indolyl-β-D-Galactoside) by selecting blue colonies. The restriction map of pGEM.3-1acZ DNA was constructed by the following restriction enzymes :Bgl I, Xbal I, Bam HI, EcoR I, Hind Ⅲ, Kpn I, Pst I, Sma Ⅰ, Sal Ⅰ. From the restriction map, the lacZ DNA was confirmed to be present at the expected position in the plasmid pGEM3-lacZ. pGEM3-lacZ/HB101 gives about 10 times more lacZ DNA than pMC 1871/HB101.

프로스타글란딘 E₁에칠에스테르의 외용 리오겔 제제 설계

양성운,이진교,이지은,김희규,박혜숙,김종석,최한곤,용철순,최영욱 한국약제학회 2004 Journal of Pharmaceutical Investigation Vol.34 No.2

External lyogels containing prostaglandin E₁ethyl ester(PGE₁-EE), a produrg of prostaglandin E₁(PGE₁) as a therapeutic agent for erectile dysfunction, were formulated to overcome the aqueous instability and enhance the percutaneous absorption. Lyogels of PGE₁-EE were prepared with ethanol (EtOH)/proplyene glycol (PG) cosolvent system as a vehicle, cineol as an enhancer, and hydroxypropylcellusose as a gelling agent. In vitro percutaneous absorption studies were performed to determine the rate of PGE₁ absorption through rat or hairless mouse skin. The permeability of PGE₁-EE lyogel with enhancer was 16-fold greater than that of lyogel without enhancer. Cosolvent produced 9-fold increase in percutaneous absorption. Pharmacodynamic effects of lyogels were evaluated in mature male cats in terms of intracavernosal pressure (ICP). Lyogles containing 0.01% of PGE₁-EE showed higher ICP compared to intraurethral preparation of PGE₁(1%) and enhancer-free control lyogel. The shelf-life (t_(10%) of lyogel at refrigerated condition (4℃) was calculated as 928 days, which is 4.2 times longer than that of control hydrogel. As a result, PGE₁-EE was formulated successfully to a lyogel system with a selective enhancer and cosolvent system for the topical delivery of PGE₁.

Dietary habits and gastroesophageal reflux disease in preschool children

Choi, You Jin,Ha, Eun Kyo,Jeong, Su Jin The Korean Pediatric Society 2016 Clinical and Experimental Pediatrics (CEP) Vol.59 No.7

Purpose: To identify the relationship between dietary habits and childhood gastroesophageal reflux disease (GERD) in preschool children. Methods: We performed a questionnaire study to analyze the relationship between dietary habits and GERD in 85 preschool children with GERD and 117 healthy children of the same age. Results: Irregular and picky eating were more p-revalent in the GERD group than in the control group (odds ratio [OR], 4.14; 95% confidence interval [CI], 1.37-12.54 and OR, 4.96; 95% CI, 1.88-13.14, respectively). The snack preferences and the late night eating habits were significantly more prevalent in the GERD group than in the control group (OR, 3.83; 95% CI, 1.23-11.87 and OR, 9.51; 95% CI, 2.55-35.49, respectively). A preference for liquid foods was significantly more prevalent in the GERD group (OR, 9.51; 95% CI, 2.548-35.485). The dinner-to-bedtime interval was significantly shorter in the GERD group than in the control group ($157.06{\pm}48.47$ vs. $174.62{\pm}55.10$, P=0.020). In addition, the time between dinner and bedtime was shorter than 3 hours in 47 children (55.3%) of the GERD group and 44 (37.6%) of the control group. This difference was statistical significance (P=0.015). Conclusion: Dietary habits such as picky and irregular eating, snack preference, a preference of liquid foods, late night eating, and a shorter dinner-to-bedtime interval had a significant correlation with GERD. Further large-scale studies are necessary to confirm our results.

Cerebral Amyloid Angiopathy Presenting as Cerebral Infarction in a Young Man: A Case Report

Choi Yuna,Choi Jin Kyo,Choi Hyun Seok,Byun Jun Soo,Lee Eun Jeong 대한자기공명의과학회 2022 Investigative Magnetic Resonance Imaging Vol.26 No.3

Cerebral amyloid angiopathy (CAA) is one of the most common causes of lobar intracerebral hemorrhages. It characteristically occurs in persons aged ≥ 55 years. However, there are several reported cases of CAA occurring in those younger than 55 years. Herein, we report a case of a 46-year-old male patient who presented with cerebral infarction. The patient complained of repetitive right-side weakness. The patient was diagnosed with presumed CAA considering his clinical symptoms, brain MRI findings, and 18F-flutemetamol brain positron-emission tomography findings