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      • KCI등재

        Effect of span length on the fit of zirconia framework fabricated using CAD/CAM system

        이정열,최상진,김민수,김하영,김영수,신상완 대한치과보철학회 2013 The Journal of Advanced Prosthodontics Vol.5 No.2

        PURPOSE. The purpose of this study was to evaluate the effect of the span length on the fit of zirconia framework fabricated using CAD/CAM system. MATERIALS AND METHODS. Abutments for single, 4-unit and 6-unit fixed partial prostheses were fabricated. Ten zirconia frameworks were fabricated for each group. The marginal and internal gap were presented by means of replica technique and measured by measuring microscope (AXIO®, Carl Zeiss, Rochester, NY) and software (I-solution®, IMT i-solution Inc., Vancouver, BC, Canada). The results were statistically analyzed by multivariate analysis test and Dunnett T3 test for post hoc test (α=.05). RESULTS. There were statistically significant differences at 2, 4, 7, 8 points (mesio-distal section) and b, d, e, f, g (labio-lingual section). In some marginal reference points of 6-unit group (P<.05), the marginal gap were larger than 120 μm. CONCLUSION. Span length of zirconia core may have an influence on marginal and internal fit. Within the limitation of this study, the increase of span length of zirconia framework of 6 or more-unit fixed partial denture may decrease the marginal and internal fit.

      • KCI등재

        Recruitment and enrollment in a randomized clinical trial of mandibular two-implant overdenture

        이정열,김민수,김하영,신상완 대한치과보철학회 2013 The Journal of Advanced Prosthodontics Vol.5 No.2

        PURPOSE. The purpose of this study was to evaluate the effectiveness of a promotion campaign for subject recruitment and selection, and reasons of withdrawal from a prospective clinical trial of mandibular two-implant supported overdenture. MATERIALS AND METHODS. The subjects of this study were participants in a randomized controlled clinical trial for investigating prognosis of implants and overdentures with attachments. Recruited subjects were classified by gender, age, and participation motives. Withdrawal rate of the participants before and after enrollment were evaluated. RESULTS. 177 patients were recruited and 51 patients were enrolled for the trial. Among them, 40 participants eventually took part in the trial. 116 subjects (65.5%) were recruited by advertisement and 61 (34.5%) were referred by patients of the hospital or local clinics. Regarding recruitment effectiveness, newspaper recruited the largest number of participants. With respect to referral patients, the proportion of our hospital patients was higher (37/61). Subjects in their 70s comprised the largest proportion (22/51). The male to female ratio was similar (25:26). Final withdrawal rate of all subjects were 74.0%. Among the reasons for withdrawal from enrollment (n=126) presence of remaining teeth and lack of motivation were the most common reasons. CONCLUSION. To facilitate recruitment of clinical trial subjects and improve enrollment rate, it is important to obtain a sufficient number of researchers, perform promotion activity with diverse strategies, cooperate with local dentists, increase the research funding, and alleviate subjects’ fear against clinical trials by thorough consultation.

      • 수직수문하의 경계층흐름

        이정열 한국수자원학회 1994 물과 미래(한국수자원학회지) Vol.27 No.3

        수직수문하의 경계층 흐름(boundary layer flow)이 경계고정좌표계(Boundary- Fitted Coordinate System)에서 무작위 소용돌이 판 방법(Random Vortex Sheet Method)과 요소내 소용돌이 방법(Vortex-in-Cell Method)을 이용하여 수치계산되었다. 수치해에 의한 수문을 따라 형성된 경계층이 수축률의 실험자료와 비점성이론에 의한 그 결과의 차이를 유발하는 주원인인 것으로 보여진다. 그 동안 주원인일 것으로 믿어왔던 바닥면 경게층의 역할은 수문면의 그 것보다는 적은 것으로 수치계산되었다. 또한 차원해석을 통하여 경계층 흐름에 의한 수축율의 그 차이가 수문 길이의 평방근에 반비례하는 것으로 추정되었으며, 이는 Benjamin(1956)에 의하여 분석된 것과 결국 동일한 것임이 밝혀졌다. 수치모델과 차원해석에 따른 결과는 Benjamin(1956)에 의해 얻어진 수축률의 실허미와 비교하여 만족할 만하였다. The boundary layer flow under a sluice gate is numerically solved by the random vortex sheet method combined with the vortex-in-cell method in a boundary-fitted coordinate system. The numerical solution shows that the boundary layer developed along the vertical sluice gate wall is the primary cause for the discrepancy in the contraction ratio between the laboratory experiments and inviscid theory; the bottom boundary layer plays much a smaller role in the discrepancy. By dimensional analysis it is concluded that the discrepancy is inversely proportional to the 3/4th power of the gate opening, as analyzed by Benjamin(1956). The results of the numerical simulation and dimensional analysis show a good agreement with experimental results obtained by Benjamin(1956).

      • CMMI 기반의 무기체계 획득 위험관리 프로세스 평가방법 연구

        이정열 한국국방경영분석학회 2015 한국국방경영분석학회지 Vol.41 No.1

        The purpose of this paper is to find the effective appraisal method for the risk management process of weapon systems acquisition business. To achieve the purpose of this study, First, a comparison and selection among international standard appraisal methods was conducted based on theoretical review for appraisal method of international standards for business process. Second, creating a business process appraisal frame was conducted after analyzing the business process appraisal method based on SCAMPI(Standard CMMI Appraisal Method for Process Improvement). 이 연구는 무기체계 획득 사업을 위한 효과적인 위험관리 프로세스의 평가방법을 도출하는데 그 목표가있다. 본 연구의 목표를 달성하기 위해서 먼저 조직의 프로세스 평가방법에 대한 이론적 고찰을 수행하여무기체계 획득 업무에 적합한 프로세스 평가방법을 비교 및 선정하고, 능력성숙도통합모델(CMMI : Capability Maturity Model Integration)에서 조직의 업무 프로세스 평가방법으로 활용하는 SCAMPI (Standard CMMI Appraisal Method for Process Improvement) 평가방법을 기반으로 획득 조직의 위험관리프로세스 수준을 평가할 수 있는 하나의 평가 프레임을 제시하였다.

      • KCI등재후보
      • 밀새우 Palaemom (Exopalaemon) carinicauda HOLTHUIS의 呼吸代謝에 미치는 溫度 및 鹽分濃度의 影響

        李廷烈 군산대학교 1982 群山水産專門大學 硏究報告 Vol.16 No.3

        Much work has been done on heat recovery of exhaust gas relating on the decreased rate of fuel oil and efficiency of boiler, but gas rarely been done on the relation to the decreased temperature of exhaust gas, the loss of exhaust gas, the increased temperature of air, and the boiler efficiency of packaged boilers. The boilers for this experiment were 30t/h (A) and 20t/h (B) packaged boilers. The loss of exhaust gas was calculated by Bacharach Stack Less Calculator and carbon deoxide in exhaust gas was measured by Fyrite Co2 Indicator. The results were as follows; 1.When the temperature of exhaust gas was decreased, the decreased quantity of the loss of exhaust gas was increased and decreased loss showed 3.12% in (A) boiler and 2.95% in (B) boiler. And the decreased of exhaust gas temperature for decreasing 1% loss of exhaust gas was 24.10℃ in (A) boiler, 22.33℃ in (B) boiler. 2.The increased temperature of air for combustion was in proportion to the decreased temperature of exhaust gas and for increasing 1℃ of air the decreased temperature of exhaust gas showed 1.21 ℃ in (A) boiler and 0.92℃ in (B) boiler 3.In proportion to the temperature of exhaust gas, the loss of exhaust gas was increased; the loss of exhaust gas was decreased to 5.9-6.9℃ in (A) boiler and to 8.3-10.2% in (B) in boiler. 4.The efficiency of boiler was increased in proportion to the increased temperature of air for ; then the air temperature was increased to 52-72℃ , efficiency of boiler was 88.02-91.49% in (A) boiler, when the air temperature was increased to 65-78℃ that of boiler was 83.77-86.44% in (B) boiler.

      • KCI등재

        부모의 양육 스타일과 청소년의 심리적 적응에 관한 연구 : 재미 한국 청소년을 대상으로

        이정열 한국아동심리재활학회 2000 놀이치료연구 Vol.4 No.2

        아시아계-미국인 부로의 독특한 양육 스타일 및 문화 특정적 양육 스타일이 자녀들의 발달에 미치는 영향에 관한 연구들은 극히 드물기 때문에 임상 장면에서 아시아계청소년들을 이해하고 도움을 준다는 것은 매우 어렵다. 이 연구는 재미 한국인 부모들의 문화 특정적 양육 스타일이 청소년 초기 자녀들의 심리적 조정에 미치는 영향에 대해 탐색하였다. 연구 대상은 미국에서 태어나 양육된 39명의 재미 한국 청소년들이며 이들은 캘리포니아주의 7개 도시에서 표집되었다 39명의 피험자들에게는 RATC와 CPBI 질문지가 실시되었고 표집된 자료는 다중 회기 분석법을 통해 몇 가지 유의미한 결과들이 발견되었다. 재미 한국 청소년 집단과 미국인 비교집단 간에는 RATC에서 불안 및 우울 척도에서 유의미한 차이가 나타났고, 재미 한국인의 양육 스타일들과 RATC에서 몇 가지 유의미한 정적 및 부적 상관이 있었다. This study demonstrated the possibility of difference between Korean-American early adolescent groups and non Korean-American in terms of their levels of anxiety and depression, and some specific of Korean-American parenting styles which may affect both positively and negatively on the development of adolescent psychological adjustment. Since this study was a first attempt to explore the culture specific Korean-American parenting style, in spite of the fact that there were few significant finding, the results of this study require careful consideration in terms of putting them in the social and cultural context. However, the results of this study brought anew perspectives to the relatively unique Korean-American parenting styles.

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