• 한국보육지원학회지
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• 제16권1호
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• pp.51-74
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• 2020

Objective: This study tried to find out if a teacher education program that supports professionalism for beginning child care teachers in toddler classes is effective in professionalism, self-respect, and efficacy in teaching. Methods: The study subjects were 40 beginning child care teachers in toddler classes teaching in day care centers in Seoul, Incheon, and Gwangmyeong Gyeonggi-do. They were divided into an experimental group (20 teachers) and a comparative group (20 teachers). The collected data were applied to the SPSS 22.0 program. To find homogeneity of the two groups, a t-test was conducted. To analyze an intergroup difference, ANCOVA was conducted in the way of setting a pre-test score as a covariate. Results: The experimental group which participated in the program showed more positive effects than the comparative group in terms of professionalism, self-respect, and efficacy in teaching. Conclusion/Implications: Based on the results of this study, the program is expected to be meaningful in the field of early childhood education, and to lay the foundation for beginning child care teachers in toddler classes to become experts in their field.

• 한국농림기상학회지
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• 제7권1호
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• pp.4-14
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• 2005

CarboKorea and HydroKorea are the domestic projects aiming to improve our understanding of carbon and water cycles in a typical Korean forest located in a complex terrain with a watershed connected to large rivers. The ultimate goal is to provide a nowcasting of these cycles for the whole Peninsula. The basic strategy to achieve such goal is through the inter- and multi-disciplinary studies that synthesize the in-situ field observation, modeling and remote sensing technology. The challenge is the fact that natural ecosystems are nonlinear and heterogeneous with a wide range of spatio-temporal scales causing the variations of mass and energy exchanges from a leaf to landscape scales. Our paradigm now shifts from temporal variation at a point to spatial patterns and from spatial homogeneity to complexity of water and carbon at multiple scales. Yet, a large portion of our knowledge about land-atmosphere interactions has been established based on tower observations, indicating that the development of scaling logics holds the key to the success of CarboKorea and HydroKorea. Here, we review the pioneering work of FIFE (First ISLSCP Field Experiment) on scaling issues in a temperate grassland and discuss the lessons from it for the application to Gwangneung forest site.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1997년도 춘계학술대회
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• pp.414-417
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• 1997

This paper presents vessel contour for extracting features and segmentating narrow blood vessels down to a diameter of two pixels in digital subtraction angiographic image. We present a new tracking algorithm for contour, mainly blood vessels in DSA image, and extracting properties such as their intensities, diameters, and center lines by exploiting spatial continuity. The proposed algorithm comes to detect blood vessel's boundary using difference edge detector one of homogeneity operator and find a next centerline position by direction vector of edge information. This algorithm enhanced variation of vessel's diameter compared to Sun's tracking algorithm and lessoned to compute as direction vector decide adaptively entire vessel's direction field. The processed images are intended to support radiologists in diagnosis, radiation therapy planning, and surgical planning. The algorithm should be useful for automating angiographic analyses of blood vessels.

• 대한안전경영과학회지
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• 제17권1호
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• pp.125-130
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• 2015

Techniques, using physical wedge filter and using dynamic wedge filter and FIF(Field in Field) and ISCT(Irregular Surface Compensating Technique), have been developed according to progress of radiation therapy of breast cancer. Measurement of dose was done to judge the usefulness of technique using three cases, non tissue loss after breast conserving operating and tissue loss after breast conserving operating and mastectomy. Dose indexes of breast tissue, CI (Conformity Index), HI (Homogeneity Index) and QOC (Quality of Coverage), dose index of skin, or dose indexes of lung, volume of 50 percent dose and 20 percent dose were estimated and compared. Using dynamic wedge filter is useful plan at non tissue loss allowing for high dose of lung. FIF and ISCT are useful plan at tissue loss. ISCT is useful plan at mastectomy. Henceforth, we need to apply to valid plan and body type and thorax size.

• 한국자동차공학회논문집
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• 제16권5호
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• pp.29-36
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• 2008

Diesel vehicle is growing in importance in light-duty sector as a way of reducing greenhouse gases due to improved fuel economy. Carbon monoxide, gas-phase hydrocarbon and organic fraction of diesel particulates can be oxidized to harmless products using a diesel warm-up catalyst (WCC). This study investigated the effect of a turbocharger and a baffle on flow fields and temperature distributions in the WCC for Diesel vehicles by a numerical analysis. In the case of the WCC with the turbocharger, velocity vectors and temperatures of inlet of the WCC have the relatively homogeneous distributions by the swirl generated from the turbocharger. Velocity vectors and temperatures of inlet of the WCC with the turbocharger and the baffle have the improved distributions in homogeneity compared with the case of the WCC without the baffle. The homogeneous flow field and the temperature distribution in the WCC may contribute to improve the conversion performance of the catalysts.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 A
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• pp.63-65
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• 1994

In this paper, the design, fabrication and test of inside notched superconducting coil are described. The inside notched coil is one of the basic configurations, producing homogeneous magnetic field. This magnet is a primitive version of MRI or NMR magnet in Korea Electromagnetic Research Institute. To test the magnetic field distribution inside the magnet, a X-Z scanner was made and the homogeneity was about $1.8{\times}10^{-3}$in 5 cm dsv (Diameter of Spherical Volume).

• 대한안전경영과학회지
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• 제14권1호
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• pp.101-108
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• 2012

In this study was conducted numerical analysis to evaluate the stability of BTR(Built-in Timber Roof Tunneling Method), which is one of construction methods of underground structures in the non-opening state. The discretion method was applied to individually model reinforcing members of BTR, and the homogeneity analysis technic by area ratio was used to verify the feasibility comparing this result with that from conventional analysis method. The parameter study was performed to evaluate the effect varying ground depth, distance length of reinforcing supports and to verify the field applicability of new analysis method. The results showed the very precise value with allowable error, so this method can be applied in the field, The more length of supporting members caused the more vertical displacement and the top displacement increment of support members is larger than that of ground surace. The effect of ground depth was more impressive than that of distance length of reinforcing supports.

• Radiation Oncology Journal
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• 제28권1호
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• pp.39-49
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• 2010

목 적: 좌측 유방의 방사선치료에 있어, 3 빔 또는 5 빔을 이용한 세기변조방사선치료(intensity modulated radiation therapy, IMRT)와 다중빔조사영역 치료기법(multistatic fields techniques, MSF) 사이의 선량학적 차이를 분석하고자 하였다. 대상 및 방법: 개선된 선량 균일성을 만들 수 있는 가능성을 지닌 두 종류의 방사선치료 기술을 서로 비교 분석하였다. 첫째, 다중빔조사영역치료로 주조사야와 소조사야를 동시에 사용하여 치료하였다. 둘째, 고정된 다엽 조준기를 사용하는 IMRT로, 3 빔 또는 5 빔을 이용하였다. 유방보존술 후 방사선치료를 받은 16명의 초기 좌측 유방암 환자들을 대상으로 방사선치료계획들을 세운 다음, 이들을 선량학적 측면에서 비교 분석하였다. 결 과: $V_{95}$와 선량균일지수의 평균값은, 이 세 치료 사이에 통계학적으로 유의한 차이가 없었다. 방사선처방선량의 110% 이상을 받는 극심한 열점은 세 치료 모두에서 관찰되지 않았다. 동측 폐와 심장의 피폭 선량측정인자들에 대한 Tukey 검정에서, 세기변조방사선치료가 다중빔조사영역치료에 비해 저선량 영역의 피폭 선량을 유의하게 증가시킨 반면, 오히려 고선량 영역에서는 다중빔조사영역치료가 방사선 피폭을 약간 증가시켰다. 결 론: 선량 균일성 개선을 위해, 통상적인 쐐기기법 대신, 세기변조방사선치료보다 쉽게 계획되고 실시 될 수 있는 다중빔조사영역치료의 적용은 초기 좌측 유방암의 방사선치료 기술로 적합하다고 생각한다.

• 대한기계학회논문집A
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• 제28권12호
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• pp.1950-1957
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• 2004

Analysis for structures composed of materials containing regularly spaced in-homogeneities is usually executed by using averaged material properties. In order to evaluate the effective properties, a unit cell is defined and loaded somehow, and its response is investigated. The imposed loading, however, should accord to the status of unit cells immersed in the macroscopic structure to secure the accuracy of the properties. In this study, mathematical description for the periodicity of the displacement field is derived and its direct implementation into FE models of unit cell is attempted. Conventional finite element code needs no modification, and only the boundary of unit cell should be constrained in a way that the periodicity is preserved. The proposed method is applicable to skew arrayed in-homogeneity problems. Homogenized in-plane elastic properties are evaluated for a few representative cases and the accuracy is examined.

• Journal of Mechanical Science and Technology
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• 제18권8호
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• pp.1461-1469
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• 2004

Acoustic characteristics in an industrial gas-turbine combustor are numerically investigated by a linear acoustic analysis. Spatially non-homogeneous temperature field in the combustor is considered in the numerical calculation and the characteristics are analyzed in view of acoustic instability. Acoustic analyses are conducted in the combustors without and with acoustic resonator, which is one of the acoustic-damping devices or combustion stabilization devices. It has been reported that severe pressure fluctuation frequently occurs in the adopted combustor, and the measured signal of pressure oscillation is compared with the acoustic-pressure response from the numerical calculation. The numerical results are in good agreement with the measurement data. In this regard. the phenomenon of pressure fluctuation in the combustor could be caused by acoustic instability. From the numerical results for the combustor with present acoustic resonators installed, the acoustic effects of the resonators are analyzed in the viewpoints of both the frequency tuning and the damping capacity. It is found that the resonators with present specifications are not optimized and thus, the improved specification or design is required.