• 한국조명전기설비학회지:조명전기설비
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• 제11권5호
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• pp.80-85
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• 1997

전력계통의 고 신뢰도 운전을 위하여 전력용 변압기의 예방진단기법은 매우 중요하다. 그리고, 특히, 경제적 관점에서 운전중인 변압기의 예방진단이 요구된다. 이와 관련하여 외국에서는 부분방전 음향위치 측정법에 대한 연구가 1960년대에 본격적으로 시작되어 관련이론에 대한 연구가 계속되었고 국내에서는 변압기내의 부분방전 위치측정법으로 부분방전시 발생되는 전기신호와 초음파신호를 검출하여 부분방전의 위치를 결정하는 전기-초음파 측정법과 발생되는 초음파신호를 두 개의 초음파 센서로 측정하여 부분방전의 위치를 결정하는 초음파-초음파 측정법이 연구되었다. 또 이 초음파-초음파 측정법에 의하여 1차원과 2차원 및 3차원에서 부분방전 위치를 도식적으로 결정하는 방법이 제시되었다. 앞에서 제시한 방법들은 부분방전의 위치를 추정할 때 부분방전 신호원이 한 개라고 가정하였다. 그러나 실제적으로 부분방전 신호원의 수가 다수일 수 있으므로 본 논문에서는 초음파-초음파 측정법을 이용하여 다수 신호원의 위치를 측정하는 방법을 제시하고자 한다.

• 한국의상디자인학회지
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• 제10권1호
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• pp.125-134
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• 2008

Consumers' need for uniqueness reflects individual differences in counterconformity and related to the attitude toward brands as well as purchase behavior. To understand the relationship between consumer's personal characteristics and purchase behavior, the study investigated the effect of consumers' need for uniqueness and clothing interest on the brand consciousness, loyalty and purchase intention. Survey was utilized to collect the data and subjects were 271 college students. Measures consisted of five main constructs: Consumer's need for uniqueness, clothing interest, brand consciousness, brand loyalty, and purchase intention. The measurement and structural models were evaluated using PRELIS 2 and LISREL 8.53. Consumer's need for uniqueness was confirmed to have three constructs: creative, unpopular, and avoidance. The researcher tested Model 1 and developed five other models-Models 2 through 6-based on the results from Model 1 evaluation. The additional Models 2 through 6 were nested in Model 1. To select a best model, the researcher compared the value of chi-square, RMSEA, GFI, AIC, and ECVI. Since Model 6 also illustrated conceptually or theoretically reasonable relationships among constructs as well, it was finally selected as a best model. In the Model 6, the creative dimension of consumer's need for uniqueness had a negative relationship with brand loyalty, while the avoidance dimension of consumer's need for uniqueness had positive relationship. The unpopular dimension of consumer's need for uniqueness and clothing interest had significant positive effects on the brand consciousness. The brand consciousness was significantly related to brand loyalty and brand loyalty to purchase intention.

• 한국양식학회지
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• 제18권3호
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• pp.180-188
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• 2005

The separation performances for thirty different dimensions of a low-pressure hydrocyclone (LPH) were tested in order to obtain an optimum dimension scale for fecal solid removal from an aquaculture system. The geometric variables were considered on two inlet diameters (Di: 30 and 50 mm), five overflow diameters (Do: 30, 50, 60, 70 and 100 mm), and three cylinder lengths (Lc: 250, 345 and 442 mm), while the cylinder diameter (Dc) of 335 mm, underflow diameter (Du) of 50 mm and cone angle (${\theta}$) of $68^{\circ}$ were kept constant. A small size for carp feces was regarded as the target for the removal of solids. Spherical polystyrene particles (1.1-1.3 mm dia., ${\rho}_s=1.05g/cm^3$), which demonstrate a similar settling velocity and specific gravity to the carp feces, were used as feed. The separation performance was tested in the range of 330 to 1200 ml/s of the inflow rate. Experimental results using ANCOVA and the Tukey test (${\alpha}=0.05$) demonstrated that the separation performances of LPH were significantly affected (P<0.05) by fi, Di and Do. In contrast, there was no significant Lc effect (P>0.05) on the separation performances. The maximum separation performance was detected at dimension combinations of 30 mm of inflow diameter (Di), 50, 60 and 70 mm of overflow diameter (Do), 345 mm of cylinder length (Lc). The dimension proportions were 0.09, 1.03, 0.15-0.21 and 0.15 (or Di/Dc, Lc/Dc, Do/Dc and Du/Dc, respectively.

• 한국양식학회지
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• 제18권3호
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• pp.189-195
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• 2005

By testing the separation performance for a fine settleable solid removal system in an aquaculture system using polystyrene particles as an experimental substitute, the optimal geometric dimensions for a Low-Pressure Hydrocyclone (LPH) were obtained. The design approach far the LPH took into consideration two inflow diameters (Di: 30, 50 mm), three overflow diameters (Do: 60, 70, 100 mm) and four cylinder lengths (Lc: 250, 345, 442, 575 mm), while the cylinder diameter (Dc) at 335 mm, the underflow diameter (Du) at 50 mm and the cone angle (${\theta}$) at $68^{\circ}$ were kept constant. The separation performances of 19 different dimension combinations of LPH were tested, ranging from 300 to 1200 ml/sec of inflow rate using substitute polystyrene particles (0.4-0.7 mm dia., ${\rho}_s=1.05g/cm^3$). These polystyrene particles exhibit a similar density and settling velocity to the fine fecal debris of the common carp. The total separation efficiency for the inflow rate ranged from a high of 97% to a low of 20%. Experimental results obtained by ANCOVA and the Tukey test (${\alpha}=0.05$) showed that the separation performances of the LPH were significantly affected (P<0.05) by the fi, Di, Do and Lc. The maximum separation performance was detected at a dimension combination of 30 mm of inflow diameter (Di), 60 mm of overflow diameter (Do), 442 and 575 mm of cylinder length (Lc). The dimension proportions were 0.09, 1.32-1.72, 0.18 and 0.15 for Di/Dc, Lc/Dc, Do/Dc and Du/Dc respectively.

• 한국융합학회논문지
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• 제11권2호
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• pp.331-339
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• 2020

본 연구는 예비교사에게 요구되는 미래 교사역량 진단도구를 개발하고 타당화하는 것을 그 목적으로 하였다. 본 연구에서 미래 교사역량으로 지식, 실천, 인성 등 3차원에서 각각 기초역량과 직무역량으로 위계화하여 가설모형을 설정하였다. 본 가설모형을 바탕으로 54개의 예비문항을 개발하였으며, J지역 237명의 예비교사를 대상으로 역량 진단검사를 실시하였다. 본 연구의 결과는 다음과 같다: 첫째, 본 연구의 결과 미래 교사역량은 지식 차원 6개 요인 18개 문항, 실천 차원 6개 요인 17개 문항, 인성 차원 6개 요인 18개 문항 등 총 53개 문항이 도출되었다. 둘째, 미래 교사역량 진단 모형의 적합성은 비교적 만족할 만한 수준이었고, 집중타당성과 판별타당성이 검증되었다. 본 연구의 결과에 따라 논의하였으며, 마지막으로 본 연구의 시사점 및 후속연구 제언을 제시하였다.

• Imaging Science in Dentistry
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• 제45권1호
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• pp.41-47
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• 2015

Purpose: This study was performed to evaluate the linear distance accuracy and reliability of stitched small field of view (FOV) cone-beam computed tomography (CBCT) reconstructed images for the fabrication of implant surgical guides. Material and Methods: Three gutta percha points were fixed on the inferior border of a cadaveric mandible to serve as control reference points. Ten additional gutta percha points, representing fiduciary markers, were scattered on the buccal and lingual cortices at the level of the proposed complete denture flange. A digital caliper was used to measure the distance between the reference points and fiduciary markers, which represented the anatomic linear dimension. The mandible was scanned using small FOV CBCT, and the images were then reconstructed and stitched using the manufacturer's imaging software. The same measurements were then taken with the CBCT software. Results: The anatomic linear dimension measurements and stitched small FOV CBCT measurements were statistically evaluated for linear accuracy. The mean difference between the anatomic linear dimension measurements and the stitched small FOV CBCT measurements was found to be 0.34 mm with a 95% confidence interval of +0.24 - +0.44 mm and a mean standard deviation of 0.30 mm. The difference between the control and the stitched small FOV CBCT measurements was insignificant within the parameters defined by this study. Conclusion: The proven accuracy of stitched small FOV CBCT data sets may allow image-guided fabrication of implant surgical stents from such data sets.

• 한국발생생물학회지:발생과생식
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• 제18권1호
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• pp.33-41
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• 2014

We investigated the process of yolk absorption in Korean rose bitterling, Rhodeus uyekii, and determined the changes in its morphometric characteristics. The R. uyekii from 1 days post hatching (DPH) to 21 DPH, the eye diameter (ED) was 5.4 at 5 DPH. Thereafter, the ED/total length (TL) ratio increased to 10.7 at 21 DPH (p<0.05). The yolk length (YL) decreased from 95.4 to 1.1 by 21 DPH, and this rate of decrease was greater than that for any other dimension (p<0.05). 12 morphometric dimensions/TL for the R. uyekii were measured at each sampling day from 21 DPH to 170 DPH. At just hatching, the average TL and BW were $6.1{\pm}0.09mm$ and $4.9{\pm}0.07mg$, respectively. At 53 DPH, the average TL was $12.9{\pm}0.28mm$ and the average BW was $14.7{\pm}0.72mg$; the total length growth equation was $TL=5.507e^{0.038t}$ ($R^2=0.916$). Further, the body weight growth equation was $BW=3.3647e^{0.0296t}$ ($R^2=0.9354$). The dimensions with regard to body depth showed the greatest growth rates in the external characteristics of the fish (p<0.05). The patterns of the morphometric characteristics measured in this study can be classified in three ways. The patterns were shown to be increased (y=0.0992x+12.07, $R^2=0.8333$), decreased (y=-0.0569x+42.029, $R^2=0.8395$) or maintained (y=0.005x+18.263, $R^2=0.3678$) from 21 DPH to 170. These results will provide useful indices for the successful rearing of the R. uyekii.

• 보건행정학회지
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• 제12권4호
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• pp.34-55
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• 2002

In this study, the impact of organizational culture on the quality of social work services in hospitals were empirically analysed. A mailed questionnaire survey was conducted between February 19 and April 10, 2001. A sample of total 70 hospitals, including general hospitals with one social worker at least and single-department hospital with two social workers or more, were identified nationwide through the registry of Korean Association of Medical Social Workers and Korean Association of Hospitals. According to coping strategy and reacting pattern with the environmental changes, four types of organizational culture in each hospital, classified as group culture, developmental culture, hierarchial culture, and rational culture, were adopted for the independent variables. Three dimensional aspects of quality of social work service - structure, process, and outcome were selected as dependent variables in this study. Also the quality of social work service was distributed into provider-perceiving quality and consumer-perceiving quality The major findings were as following in summary; First, most social workers reported that the characteristic of culture in their hospitals are group culture the first, hierarchial culture the second, developmental culture the third, and rational culture finally in order of comparing the level of quality perceived between social worker's recognition. Second, service provider and consumer, The provider-perceiving quality showed less score than that of consumer, especially the lowest was the score of quality of outcome perceived by provider. Third, according to the types of organizational culture, there were significantly different levels of quality in total social work services, structure dimension and process dimension. The quality of outcome dimension did not show significant differences among the type of organizational culture. Finally, the most influential variables to the quality of social work service ice proved departmental form of social work unit, leader of social work unit, and developmental culture of hospital To assure quality services, accordingly, social work unit in hospital is required to be organized as a single unit, that means to be an independent department of which qualified social worker is supposed to control the unit. It is strongly recommended to develop leadership for the leaders of social work unit.

• 한국과학교육학회지
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• 제15권3호
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• pp.325-331
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• 1995

The purpose of this study is to analyze learning objectives of biology contents in SATIS 14-16. Modified the 5th NAEP three dimentional science assessment framework was used to analyze learning objectives of SATIS 14-16. This study will be a basic data for the development of STS programs in KOREA. The following results were obtained. 1. In a content dimension, 'structures and functions of organism'(63.9%) was the most frequently found, followed by 'the nature and our Iives'(22.1%), 'a continuity of Iife'(9.4%) and 'our surrounding Iives'(4.7%). 2. In a cognitive dimension, an understanding of scientific knowledge(32.7%) was the most frequently found, followed by an improvement of inquiry ability(25.6%), attitude(24.7%), and scientific knowledge and its application(17.0%). 3. In a context dimension, a personal context(32.8%) was the most frequently found, followed by a social context(27.3%), a scientific context(20.0%) and a technological context(20.0%). 4. There were some differences in behavior when each content was compared. In 'surrounding lives' and 'a continuity of life', an understanding of scientific knowledge was the most frequently found. In 'structures and functions of organism' and 'the nature and our lives', proportions of four behavioral catagories were relatively even. 5. There were some differences in context when each content was compared. In 'surrounding lives', scientific context was the most frequently found, whereas in 'structures and functions of lives', individual context was found the most frequently. In 'a continuity of life', scientific and social context were found more frequently than others. In 'the nature and our lives', social context was the most frequent one.

• 한국콘텐츠학회논문지
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• 제20권1호
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• pp.505-518
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• 2020

본 연구는 단주과정에 있는 여성의 자기실현에 관한 생애사 연구이다. 연구의 목적은 여성 알코올 중독에 관한 정황들을 탐색하여 치료 및 회복을 위한 논의의 지평을 확장시키고 사회복지적인 개입방안을 제시하는데 있다. 이를 위해 7년 이상 단주 중인 여성 알코올 중독 회복자가 참여했으며, 생애사 분석을 위한 텍스트는 Mandelbaum이 제안한 생애사 분석틀에 의거하여 '삶의 영역', '전환점', '적응'으로 나눴다. 자료분석 결과 <삶의 영역>은 '개인적인 삶의 차원', '자족차원의 삶의 차원', '사회적인 삶의 차원'의 총 3개의 영역으로 분석되었다. <전환점>은 '술을 마시고 폭력을 행사하는 아버지로부터 탈출', '상사의 폭행을 피해 직장을 포기함', 'AA(단주 자조모임) 참여로 서서히 치유의 길을 걸어감'으로 드러났다. <적응>은 '공부를 잘하는 적응전략', '술을 마심으로써 분노를 삭이는 적응전략', 'AA로의 의탁과 자기실현을 생각하는 적응전략' 으로 도출되었다. 이러한 연구결과를 바탕으로 자기실현에 입각한 사회복지 실천 및 정책 차원의 논의를 제시하였다.