• The Journal of Advanced Prosthodontics
• /
• 제12권4호
• /
• pp.225-232
• /
• 2020

PURPOSE. This study aimed to fabricate provisional crowns at varying build directions using the digital light processing (DLP)-based 3D printing and evaluate the marginal and internal fit of the provisional crowns using the silicone replica technique (SRT). MATERIALS AND METHODS. The prepared resin tooth was scanned and a single crown was designed using computer-aided design (CAD) software. Provisional crowns were printed using a DLP-based 3D printer at 6 directions (120°, 135°, 150°, 180°, 210°, 225°) with 10 crowns in each direction. In total, sixty crowns were printed. To measure the marginal and internal fit, a silicone replica was fabricated and the thickness of the silicone impression material was measured using a digital microscope. Sixteen reference points were set and divided into the following 4 groups: marginal gap (MG), cervical gap (CG), axial gap (AG), and occlusal gap (OG). The measurements were statistically analyzed using one-way ANOVA and Dunnett T3. RESULTS. MG, CG, and OG were significantly different by build angle groups (P<.05). The MG and CG were significantly larger in the 120° group than in other groups. OG was the smallest in the 150° and 180° and the largest in the 120° and 135° groups. CONCLUSION. The marginal and internal fit of the 3D-printed provisional crowns can vary depending on the build angle and the best fit was achieved with build angles of 150° and 180°.

• 치위생과학회지
• /
• 제15권5호
• /
• pp.536-541
• /
• 2015

본 연구에서는 CAD/CAM 시스템을 이용하여 제작한 코발트-크롬 주조 금속 코핑과 코발트-크롬 소결 금속 코핑의 변연 및 내면 적합도를 비교 평가하여 다음과 같은 결론을 도출하였다. 코발트-크롬 금속 코핑의 변연 및 내면 적합도를 비교 평가는 기존의 주조방식인 CCM 그룹보다 소결과정만으로 제작한 CSM 그룹이 전반적으로 모두 우수하였다. 또한 CSM 그룹의 변연 적합도는 임상적으로 허용할 수 범위인 $120{\mu}m$ 이내 존재하였다는 결과를 통해서 그동안 매몰, 소환, 주조인 복잡한 과정을 거치면서 보철물의 오차가 발생 하였으나 소결과정만으로 공정 과정의 오차를 줄임으로써 완성도 높은 코발트-크롬 금속 코핑 제작이 가능하다고 생각된다.

• 한국수산과학회지
• /
• 제30권5호
• /
• pp.782-793
• /
• 1997

식물 플랑크톤의 인위적인 용승조건 하에서 생리적 적응 (shift-up)을 알아보기 위하여, 안정동위원소인 $^{15}N-KNO_3$를 이용하여 실험실에서 Dunaliella tertiolecta의 질산염 흡수 능력을 측정하였다. 그 결과 예상과는 달리 최대 질소비 질산염 흡수 속도 $(V_{NO3})$와 초기 질산염 농도 사이에는 유의성 있는 상관관계가 나타나지 않았다. 그러나 최대 질산염 운반 속도 $(\rho_{NO3})$와 $25\;{\mu}M$ 이하의 초기 질산염 농도 사이에는 강한 상관성이 나타났으며, 이는 배양 세포의 생리적인 상태에 의한 영향에도 기인한다. $\rho_{NO3}$의 증가는 주로 입자성 유기 질소 농도의 증가와 함께 부분적으로는 $V_{NO3}$의 증가에 기인한다. 식물 플랑크톤 개체군이 심하게 shift-down되었을 경우 질산염 흡수의 생리적 적응은 높은 초기 질산염 농도에서 주목할 만큼 저해되었다. 최대 $V_{NO3}$ 또는 $\rho_{NO3}$이 나타나는 시기는 초기 질산염 농도와 관련이 있다. 높은 초기 질산염 농도에서는 $V_{NO3}$와 $\rho_{NO3}$의 최대치가 낮은 초기 질산염 농도에서보다 $1\~2$일 정도 늦게 나타났다. 이는 Zimmerman et al. (1987)의 shift-up 모델에서의 예측과 상반되는 결과이다. Shift-up 과정은 명백히 내부적인 시간순서와 초기 질산염 농도에 의하여 조절되지만, $V_{NO3}$의 크기는 질산염 농도의 변화에 거의 영향을 받지 알았다.

• 구강회복응용과학지
• /
• 제33권2호
• /
• pp.63-70
• /
• 2017

임상적으로 고정성보철물의 적합도는 성공적인 수복을 위해 필수적인 요소이다. 보철물의 적합도는 크게 변연적합도와 내면적합도로 분류되며, 이를 평가하기 위한 방법으로는 현미경 변연 측정법, 절단면 측정법, 실리콘 복제법, 3차원 스캔데이터 중첩법, 무게 측정법, 마이크로 CT 측정법 등 다양한 방법들이 소개되고 있다. 이에 본 연구에서는 기존의 문헌들을 바탕으로 각 방법들의 장, 단점을 비교분석함으로써 디지털환경에서 보다 편리하고 정확한 측정법을 제시하고자 한다.

• 여성건강간호학회지
• /
• 제18권3호
• /
• pp.223-235
• /
• 2012

Purpose: This study was designed to examine the relationships among daily hassles, social support, entrapment and mental health status in relation to gender in university students. Methods: Data were collected via a self- administered questionnaire from 118 male and 98 female college students in Kangwon province. Data were analyzed using SPSS/WIN 18.0 program for descriptive statistics, t-test, ANOVA, Pearson correlation, and stepwise multiple regression. Results: There were significant differences in daily hassles, entrapment and depression between male and female group. Also, there were significant relationship between entrapment and mental health status (i.e. depression, anxiety, hostility, somatization) in both groups. In male students, internal entrapment was the significant predictor of depression and anxiety, and external entrapment was the significant predictor of hostility and somatization whereas, in female students external entrapment was the significant predictor of depression, and internal entrapment was the significant predictor of anxiety, hostility and somatization. Conclusion: These results suggest that entrapment is an important factor for psychological maladaptation due to stressful life events. Therefore, strategies that reduce perception of entrapment according to gender should be developed for psychological adaptation.

• 한국정보과학회논문지:데이타베이스
• /
• 제35권2호
• /
• pp.192-198
• /
• 2008

수많은 웹 정보 중에서 사용자가 원하는 정보를 찾아내는 것은 매우 어렵다. 검색 엔진은 웹정보를 요약하였다가 사용자의 질의에 따라 상대적 중요도와 정보의 적합도를 반영한 검색순위를 제공한다. 그러나 이 순위는 개별 사용자가 원하는 정보를 상위 순위에 보여주는데 제한이 있다. 본 논문에서는 사용자의 검색 의도가 질의에 가장 잘 나타난다고 보고 질의의 의미를 잘 반영하는 웹 정보를 선택적으로 상위 순위화하기 위하여 질의 내부의 단어 인접도를 이용한 재순위화 방법을 제시하였다. 실험 결과 매우 간단한 방법으로 사용자가 요구하는 정보를 75.8%의 확률로 찾아낼 수 있으며, 선별된 정보들의 선택적인 순위 상승으로 $13{\sim}20%$의 검색 효율 향상을 기대할 수 있다.

• 대한간호학회지
• /
• 제27권2호
• /
• pp.329-340
• /
• 1997

Resourcefulness was analyzed by Walker and Avant's method to make a theoretical framework for nursing. Also, the appropriate Korean terminology was identified.“Resourcefulness”means the ability to use internal and external resources to eliminate or to control stress. '자원동원성' is chosen to be the most appropriate term to reflect the concept of resourcefulness. Upon the concept analysis, availability, controllability, confidence, and self-instruction were identified as the defining characteristics of resourcefulness. Contrary to other work, "availability" means the ability to use the social resources as well as the internal cognitive-behavioral resources. “Controllability” means the ability to delay or control immediate gratification of one's needs or to divert one's own mood in order to solve problem. "Confidence" is the self-efficacy belief in one's control ability. "Self-instruction" is the cognitive ability to instruct oneself positively. Resourcefulness is learned by active experience, vicarious experience, and formal or informal instruction, and it is cued in the presence of a stressful situation or a need for change. As a result of the use of resourcefulness, the target behavior performed immediately and ultimately improve the quality of life or adaptation. Therefore, it is necessary to develop the instrument including the defining attributes identified in this study. Also, it is necessary to simultaneously analyze the related concepts of self-efficacy, self-control, and self-regulation for appropriate use.

• 대한간호학회지
• /
• 제47권3호
• /
• pp.319-331
• /
• 2017

Purpose: The purpose of this study was to develop a scale to evaluate posttraumatic growth in patients with cancer and to examine the validity and reliability of the scale. Methods: A literature review, semi-structured patient interviews and an expert panel consultation produced a 27 preliminary item questionnaire. Participants were 150 cancer patients recruited to test the reliability and validity of the preliminary scale. Data were analyzed using item analysis, exploratory factor analysis, convergent validity and internal consistency. Results: Item reduction and exploratory factor analysis led to 23 items, grouped into five subscales which were labelled new possibilities (6 items), coping skills (5 items), preciousness of life (5 items), relating to others (4 items), and personal strength (3 items). Convergent validity was evaluated by total correlation with the Functional Assessment of Cancer Therapy-General (r=.45, p<.001). The final scale demonstrated satisfactory internal consistency (Cronbach's ${\alpha}$ =.94). Conclusion: Findings from this study indicate that the Cancer-Specific Posttraumatic Growth Inventory has validity and reliability and is considered to be appropriate for assessing posttraumatic growth in patients with cancer.

• Child Health Nursing Research
• /
• 제27권3호
• /
• pp.256-265
• /
• 2021

Purpose: This study presents a translation, cultural adaptation, and psychometric evaluation of two instruments of the Fertility Awareness and Attitudes Towards Parenthood (FAAP) questionnaire (Conditions and Life changes) for use in South Korea. Methods: This methodological study included 166 university students for psychometric evaluation in the sixth step. The first five steps included forward translation, backward translation, committee review, assessment of content validity, and a pre-test. In the sixth step, psychometric properties, including internal consistency, construct validity, and criterion validity, were evaluated. Exploratory factor analysis and confirmatory factor analysis were conducted to identify the structure of the tool and to assess its validity. Results: The Korean version showed acceptable internal consistency. Cronbach's α was .73 for FAAP-Conditions and .83 for FAAP-Life changes. FAAP-Conditions showed a four-factor structure (social conditions, relationship with partner, external environment, and child-rearing support) and FAAP-Life changes had a two-factor structure (reward and burden). In the confirmatory analysis, CMIN/DF, TLI, IFI, SRMR, CFI, and RMSEA were satisfactory. Conclusion: This study provided preliminary evidence of the acceptability, reliability, and validity of the Korean version of the FAAP questionnaire in university students in South Korea. Nonetheless, further evaluation among Korean young adults is warranted to validate this instrument.

• 산업경영시스템학회지
• /
• 제20권44호
• /
• pp.425-446
• /
• 1997

In recent years, a scholars and a managers in business have taken a more interest on the effects of corporate culture on the organization effectiveness. The corporate culture has been recognized as one of the way to promote the organization performance and cope with the changes of the business environment. Edgar H. Shein defins the corporate culture as the that the pattern of basic assumptions that a given group has invented, discovered or developed in learning to cope with its problems of external adaptation and internal integration. The organization effectiveness is differently defined as the job satisfaction, job involvement, organizational commitment, organizational performance etc. The business culture help the employee (1) understand the values, the tradition, and the different management systems(decision-making basis, promotion, reward, behavior etc.) of the company, (2) make the performance-oriented decison and doings. Consequently, the excellent corporate culture would improve the organizational effectiveness. The purpose of this study is (1) to examine theoretically the content on the corporate culture and the organizational effectiveness, (2) to suggest the direction of the corporate culture management for both the management md the scholars.