• Radiation Oncology Journal
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• 제14권3호
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• pp.201-209
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• 1996

목적 : FIGO 병기 Ib 자궁경부편평상피암 환자에서 고선량율 강내치료를 이용한 방사선치료후 환해율, 5년 국소제어을, 5년 생존율 및 예후인자, 방사선 합병증을 분석하여 고선량율 강내치료의 효용성을 평가하고자 하였다. 그리고 심각한 후기 합병증 없이 만족스런 국소 제어율을 얻기 위한 외부방사선선량과 강내치료선량의 최적 선량배합을 알아보고자 하였다. 대상 및 방법 : 1979. 5 - 1990. 12월 까지 연세암센타 치료방사선과에서 자궁경부 편평상피암 FlGO 병기 Ib로 진단된후 근치적 목적하에 외부 및 강내치료를 받은 162명의 환자들을 대상으로 치료 결과를 후향적 분석하였다. 외부 방사선 치료는 LINAC 10MV X-ray를 이용해 180-200cGy/fr씩 4000-4600cGy14.5-5주를 전골반 부위에 시행하였근데, 일부환자에서 2000-4000 cGy에서 중앙차폐(midline block)를 시행하였다. 코발트 선원을 이용한 원격 조정 아프터 로딩 고선량율 강내치료를 A점에 1회당 300cGy씩 주 3회, 총 10-13회 (3000-3900 cGy)실시하여 A 점에 들어간 총방사선 조사량은 6420 - 9500cGy 으로 평균 8394 cGy 였다. 결과 : 방사선 치료후 완전 관해율은 $99.4\%$ 였다. 5년 전체생존율은 $91.1\%$이고, 5년 무병생존율은 $90.9\%$였다. 추적 관찰 기간동안 치료 실패 양상을 관찰해 보면 국소 실패만 보인 경우는 7명이었고 원격전이만 보인경우가 6명이었으며, 국소 및 원격전이가 모두 발생한 경우가 1예 있어서 국소제어 실괘율은 $4.9\%$(8/163), 원격전이율은 $4.3\%$(7/164)였다. 후기 합병증은 38명 ($23.5\%$)에서 발생하였초, 그 중 30병 직장 합병증으로 $18.5\%$ 후기 합병증 발생율을 보였고, 방광 합병증은 8명에서 발생하여 $4.9\%$ 후기 합병증 발생율을 보였다. 직장 합병증이 생긴 환자관에서 직장에 소사된 방사선량은 평균 7887 cGy 이었고, 합병증이 발생하지 않은 환자군의 평균조사량은 7488 cGy이었다. 결론 : 근치적 목적으로 외부 방사선 치료 및 고선량률 강내 치료는 FIGO병기 Ib 자궁경 부편평상피암을 치료하는데 매우 효과석이라 생각하였고, 외부방사선치료중 중앙차폐를 시행하여 A점 선량이 75Gy를 넘지 않게 방사선치료 설계를 하면 심각 합병증없이 좋은 치료성적을 얻을 수 있겠다.

• Restorative Dentistry and Endodontics
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• 제20권1호
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• pp.372-383
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• 1995

The staining tendency of esthetic restorative material was very important factor for the people who are great concern about the esthetics. Most external stains were superficial and adjustable by routine prophylactic procedure. But some of these stains were remained under superficial stain. Some of these stains were accumulative on external tooth surface and it's removal alter the anatomic contour of restoration. The purpose of this study was to evaluate and compare the staining tendency of esthetic restorative materials to staining solution. In this study two glass-ionomer cements (Fuji II Glass-Ionomer Cement and Fuji II LC Glass-Ionomer Cement) and three composite resins (Sil$\ddot{u}$x Plus, APH and P-50) were evaluated and compared. Total 8 disc-shaped specimens of each material (17mm diameter, Imm thick) were immersed in coffee staining solution. These specimens were divided into one control and 3 experimental groups according to the immersion period as follows : Control: immersed in distilled water during each testing period Group 1 : immersed in staining solution for 6 hours Group 2 : immersed in staining solution for 24 hours Group 3 : immersed in staining solution for 72 hours Staining tendency was evaluated by total color difference(${\Delta}E^*$) of specimen before and after staining by spectorcolorimeteric readings (ColorQUEST Spectrophotometer, U.SA.). The results were as follows : 1. The total color differences of each testing materials were increased with time. 2. Among the experimental groups, the Fuji II Glass Ionomer Cement showed the highest total color difference(6.803) and the Silux Plus showed the lowest total color difference(1.637). 3. In comparison of glass ionomer cements, the total color difference of chemical cured glass ionomer cements(6.803) were higher than light cured glass ionomer cements(3.891) (P<0.01). 4. In comparison of composite resins, the P-50 showed the highest total color difference and the Silux Plus showed the lowest total color difference, but there was not significant difference among composite resins(P>0.05).

• 대한방사선치료학회지
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• 제14권1호
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• pp.155-164
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• 2002

This descriptive correlation study was undertaken in order to investigate the relationship of family support and personality with quality of life in patients receiving radiotherapy for breast cancer and to provide basic data to help them improve a better quality of life. This subjects for this study were 74 out-patients undergoing a radiation therapy at C hospital in Kwang-Ju. The data were obtained using a convenience sampling technique. The tool of this study were Ro's qualify of life scale, Kang's family support scale and Wallston & others health locus of control scale. The data were analyzed using a SAS program for percentage, mean, standard deviation, Pearson Correlation Coefficient, GLM. The results were as fellows: 1. The total average score of the quality of life of the subjects was 137.22 (minimum score 38-maximum score 227), item mean score(range 1-5) was 3.15. The total average score of the family support of the subjects was 40.38(minimum score 21-maximum score 47), item mean score(range 1-5) was 3.69. The total average score of health locus of control of the subjects was 42.47(minimum score 28-maximum score 59), item mean score(range 1-6 was 3.69. 2. The results of the analysis of the relationship between the quality of life scores and the health locus of control were as follows : the total average score of the qualify of life of internal locus of control scale was 133.50, he total average score of the quality of life of external locus of control scale was 138.41. 3. There was positive correlation between the health locus of control and the quality of life(r=0.0722, p=0.5413). 4. There were significant positive correlation between family support and quality of life(r=0.2328, p=0.0399). The results of the analysis of the relationship between the each factor in the quality of life scores and family support were as fellows : There were significant difference between the self esteem factor(r=0.2974, p=0.0124), relationship with family factor(r=0.2657, p=0.0241)

• Steel and Composite Structures
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• 제28권2호
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• pp.195-207
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• 2018

First-order reliability method (FORM) is enhanced based on the search direction using relaxed conjugate reliability (RCR) approach for the embedded nanocomposite beam under buckling failure mode. The RCR method is formulated using discrete conjugate map with a limited scalar factor. A dynamical relaxed factor is proposed to control instability of proposed RCR, which is adjusted using sufficient descent condition. The characteristic of equivalent materials for nanocomposite beam are obtained by micro-electro-mechanical model. The probabilistic model of nanocomposite beam is simulated using the sinusoidal shear deformation theory (SSDT). The beam is subjected to external applied voltage in thickness direction and the surrounding elastic medium is modeled by Pasternak foundation. The governing equations are derived in terms of energy method and Hamilton's principal. Using exact solution, the implicit buckling limit state function of nanocomposite beam is proposed, which is involved various random variables including thickness of beam, length of beam, spring constant of foundation, shear constant of foundation, applied voltage, and volume fraction of ZnO nanoparticles in polymer. The robustness, accuracy and efficiency of proposed RCR method are evaluated for this engineering structural reliability problem. The results demonstrate that proposed RCR method is more accurate and robust than the excising reliability methods-based FORM. The volume fraction of ZnO nanoparticles and the applied voltage are the sensitive variables on the reliable levels of the nanocomposite beams.

• Nuclear Engineering and Technology
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• 제17권4호
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• pp.267-278
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• 1985

원자력발전소로부터 배출되는 방사성물질에 의한 피폭선량을 규제하는데 있어 몇 가지 종류들의 방식들이 적용되어 왔다. ICRP에 의해 권고된 일차 선량 당량 제한치가 가장 근본적인 것이다. 일차 제한치가 직접 적용될 수 없을 때 외부 피폭의 경우 선량당량 지표가 내부피폭의 경우 최대허용농도, 연섭취 제한치 흑은 유도대기 농도 및 최대 신체 부하량 등이 이용되어 왔다. 그러나 이 값들은 실제 배출량을 제어하는 견지에서 바로 사용할 수 없어 유도방출 기준치를 구하게 된다. 본 연구에선 월성 원자력발전소에 대해 고려되는 특정환경들 사이의 전달속도가 시간에 독립적인, 장기성 농축인자 방식으로 방출속도의 유도 제한치를 구하였다.

• 한국치위생학회지
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• 제10권1호
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• pp.157-172
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• 2010

Objectives : This study is to grasp the efficacy, locus of control, oral disease management beliefs, etc and to make a close inquiry the relevance between theses key figures and oral health promotion practice for a teacher and oral care about children and to provide the basic materials of oral health education for the teachers of infant nursery. Methods : This study was made from July to September in 2009 to nursery teacher by having the self-report questionnaire for teachers of infant nursery who are performing nursry school tearcher. Total 187 questionnaire were distributed and among these, 167 questionnaire excluding 20 questionnaire of incomplete responses were statistically analyzed with SPSS12.0. Results : The efficacy is highly in a married person(p=0.001) according to the teacher's age(P=0.006), perceived good oral status(p=0.001) according to the oral conditions and has the significant difference. The internal locus of control is highly in a married person(p=0.006) according to the teacher's age(P=0.037) and the marital status and has the significant difference statistically. The external locus of control is the highest(p=0.038) in the age of 40 among teacher's age and has the significant difference statistically. The oral disease management beliefs is the highest in the age of 20 ~ 29(p=0.001), highly in married(p=0.003) and has the significant difference according to the marital status and perceived good oral status(p=0.045) according to the oral conditions. There has no significant difference in the efficacy, the internal locus of control, the external Lotus of Control, oral disease management beliefs following by the infant oral care after taking medicines and oral care of infants after tooth brushing. Conclusions : Therefore, the oral health promotion activities should be induced by educating the nursery teacher and it needs to spread out the oral care education with the development to operate practically. It is considered in need of the infant oral care which is not burden on to the nursery teacher but helpful to the infant by connecting the subjects of dental hygiene and oral health education training.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2011년도 춘계학술대회
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• pp.731-746
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• 2011

The successful and sustainable growth of SMEs depends on their ability of strengthen their competitiveness in quality and cost and service more than anything else as a fundamental of operation. Among these key competitive factors of SMEs, quality is the most critical factor in manufacturing business fields. Because quality strongly influence cost and service performance on this manufacturing business field. There are many different ways to improve the quality performance but it needs proper management decision to choose the best way what can maximize outputs with minimum inputs. And it needs effective measurement methods and some indicators to analysis the quality performance properly. The quality cost is one of the simplest key indicators to measure the quality performance and the effectiveness of quality related management decisions. The major purpose of this study is to diagnose the categorized current level of actual quality cost of local SMEs to maximize their quality management effectiveness through comparing their level with others what's expressed in early studies. In this study, through survey on local SMEs, we found that their average annual quality cost ratio versus turnover - Total amount of annual quality cost divided by annual turnover - is around 3.69% excluded some SME's performances what have different quality control measures with others. And we found some results what corresponded with the early studies on the correlations between those categorized quality costs factors and some discrepancies between some of the literature model and the early case study results as follows. There were negative correlations between the Prevention costs and the External failure costs, and the Appraisal costs and the External failure costs, and there was positive correlation between the Appraisal costs and Internal failure costs same as early studies. But, we couldn't found any strong negative correlations between the Cost of control - Preventive costs & Appraisal costs - and the Cost of Failure of control - Internal & External failure costs -. It reveals not only the lack of effectiveness on their preventive or appraisal activities but also it can reveal there were so many effective ways to prevent the failure costs properly such as some innovative investment on Factory automation includes Error Proofing and more preventive actions to improve the effectiveness of the typical management methods likes CE (Concurrent Engineering), APQP (Advanced Product Quality Planning), FMEA (Failure Mode & Effect Analysis) etc.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1987년도 한국자동제어학술회의논문집(한일합동학술편); 한국과학기술대학, 충남; 16-17 Oct. 1987
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• pp.780-785
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• 1987

The measuring point data of clay model are widely used to design parts whose external features are important design factor such as automobiles and general die products. This paper presents a method for improving the process to generate smooth surfaces from the measuring point data using turnkey CAD/CAM system. The process of smooth-surface generation involves several steps: styline finding, curve fairing, surface generation and filleting. The process is improved by automatic curve fairing, local correction of surface and multi-boundary surface treatment. An automobile bumper and a telephone receiver are measured and modeled to test the new method. Significant time saving is resulted by changing interactive mode to automatic mode and eliminating inefficient loop of surface generation process.

• Journal of Advanced Marine Engineering and Technology
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• 제27권2호
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• pp.305-311
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• 2003

This Paper Presents an information about the heat transfer characteristics of a separate type thermosyphon in electronic equipments. The heat removal problem of electronic equipments is regarded as an important factor and a separate type heatpipes can be utilized as a cooling device of electronic equipments (such as CPU of a Personal computer or notebook). In this study. heat source ($50\times50\times2 mm $aluminum Pseudo CPU) was used for the experiment. The device can transfer heat from the evaporator to the condenser through natural circulation (without any external driving forces) and the results indicate that the device is capable of dissipating over 60W of thermal energy and keeping the heating plate surface temperature under $50^{\circ}C$.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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• pp.83-86
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• 1988

In all sorts of primary factor which produce torque ripple of d.c brushless motor cogging torque which is generated from relation between permanent magnet rotor and salient pole cannot controled by external control system. So in this paper cogging torque is analysed by simple method in which slot fuctuion is introduced. And for reducing counterplan of cogging torque d.c brushless motor which plot auxiliary slot by inequality interval is proposed. Thus the quantitative torque characteristics of new motor which designed by this method is analysed by F.E.M and validity of this new design is proved.