• 한국컴퓨터산업학회논문지
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• 제7권4호
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• pp.427-436
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• 2006

운동하는 물체의 동특성 해석을 위한 상태 공간 모델 방식이 컴퓨터에 의한 미분방정식 해석의 수학적인 도구로서 도입되었다. 시스템 표현이 간단한 행렬 연산 형태로 이루어지므로 선형 및 비선형, 시변 및 시불변 시스템과 단변수 및 다변수 시스템 등에 대하여 통일된 방식의 모델이 사용가능하다. 그리고 이러한 상태 공간 모델을 해석하기위해서는 복잡한 벡터 연산을 하여야 하지만 패킷 소프트웨어의 특정함수를 사용하여 쉽게 해석할 수가 있다. 그러나 최근에는 상용 프로그램의 발전에 따라 동특성 해석을 위한 상태 공간 모델을 대화형 도형 처리를 하여 매우 간단하게 동특성을 시뮬레이션 할 수 있는 방법이 제공되고 있다. 본 논문은 운동하는 물체의 동특성 해석을 하는 데 교육용으로 활용할 수 있는 시뮬레이터를 개발하는 목적으로 항공기의 세로 동특성 해석을 위한 시뮬레이션을 수행하고자 하였으며 항공기 세로 안정성에 대한 과도응답 특성을 해석하는 시뮬레이터를 설계하였다.

• 한국산학기술학회논문지
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• 제15권9호
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• pp.5467-5473
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• 2014

최근 전자 및 기계부품 기술의 발전으로 전자 장비는 더욱 고성능화, 소형화, 다기능화 되면서 시스템 내부에 발생하는 발열부의 온도를 제어하기 위해 히트싱크가 사용된다. 본 연구에서는 내부 터널 구조의 2가지 형상의 히트싱크의 열 성능평가를 유한요소 프로그램인 ANSYS를 이용하여 수치해석 하였다. 수치해석은 자연대류 상태에서의 열 성능을 수치해석으로 비교 분석하여 냉각핀 형상에 따른 열 성능을 평가하였다. 또한 시간에 따른 열전달 특성과 온도분표의 해석결과를 기초로 하여 히트싱크의 성능평가를 예측하였다. 수치해석의 결과, 형상 A 히트싱크가 형상 B의 히트싱크보다 열 전달율이 자연대류에서 약 70% 향상되었다.

• Asian Pacific Journal of Cancer Prevention
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• 제17권2호
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• pp.609-614
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• 2016

Background: Although breast cancer is the most common cancer in women, economic evaluation of breast cancer screening is not fully addressed in developing countries. The main objective of the present study was to analyze the cost-effectiveness of breast cancer screening using mammography in 35-69 year old women in an Iranian setting. Materials and Methods: This was an economic evaluation study assessing the cost-effectiveness of a population-based screening program in 35-69 year old women residing in rural areas of South east Iran. The study was conducted from the perspective of policy-makers of insurance. The study population consisted of 35- to 69-year old women in rural areas of Kerman with a population of about 19,651 in 2013. The decision tree modeling and economic evaluation software were used for cost-effectiveness and sensitivity analyses of the interventions. Results: The total cost of the screening program was 7,067.69 US$ and the total effectiveness for screening and no-screening interventions was 0.06171 and 0.00864 disability adjusted life years averted, respectively. The average cost-effectiveness ratio DALY averted US$ for screening intervention was 7,7082.5 US$ per DALY averted and 589,027 US $ for no-screening intervention. The incremental cost-effectiveness ratio DALY averted was 6,264 US$ per DALY averted for screening intervention compared with no-screening intervention. Conclusions: Although the screening intervention is more cost-effective than the alternative (noscreening) strategy, it seems that including breast cancer screening program in health insurance package may not be recommended as long as the target group has a low participation rate.

• Asian Pacific Journal of Cancer Prevention
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• 제16권6호
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• pp.2501-2505
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• 2015

Purpose: The present study was carried out to measure knowledge level and behavior of family health personnel (FHP) in Izmir on early diagnosis of breast and cervical cancers. Materials and Methods: The study population of this cross-sectional study was not selected. A questionnaire was applied to all FHP to measure knowledge level and behavior about cancer. The participation rate was 88%. Breast examination, mammography analysis, Papanicolaou smear applications were determined as dependent variables, and knowledge level about breast and cervical cancer, age, professional time as FHP as independent variables. Data were evaluated using definitive statistics, chi-square and logistic regression tests in SPSS software package for Windows 15.0. Results: A total of 970 family health personnel participated in the research. The age range was 20-45 years (82.4%). Mean age was $37.9{\pm}7.4$. Response rate was 87.3%. Of the participants, 88.4% performed breast self-examination. Rate of performing mammography at least once was 24.1%. Rate of performing Pap-smear examination at least once was 61.0%. In logistic regression analyses, it was determined that people with knowledge on breast and cervical cancer were those performing breast self-examination, mammography and Pap-smear examinations (p<0.05. Conclusions: It is essential that the knowledge, behavior and manners of health providers on early diagnosis for cancer increases awareness in the general population and provides information on execution ofthe most effective methods for generating a healthy society.

• Asian Pacific Journal of Cancer Prevention
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• 제15권22호
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• pp.9725-9730
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• 2014

Background: Sister chromatid exchange (SCE) in human peripheral blood lymphocytes is one of the most extensively studied biomarkers employed to evaluate genetic damage subsequent to pesticide exposure. Objective: To estimate the pooled levels of SCE in human peripheral blood lymphocytes among population exposed to pesticide. Materials and Methods: Meta-analysis on the association between SCE frequency and pesticide exposure was performed with STATA 10.0 software package and Review Manager 5.0.24 in this study. Results: The overall means of SCE were 7.88 [95% confidence intervals (95%CI): 6.71-9.04] for exposure group and 6.05 (95%CI: 5.13-6.95) for controls, respectively. There was statistically significant difference in the SCE frequency in human peripheral blood lymphocytes between pesticide-exposed groups and control groups, and the summary estimate of weighted mean difference was 1.69 (95%CI: 1.01-2.38). We also observed that pesticide-exposed population had significantly higher SCE frequency than control groups among smokers, nonsmokers, pesticide applicator, pesticide producer, other exposure population and Asian population in stratified analyses. Conclusions: Data indicate that the SCE frequency in human peripheral blood lymphocytes might be an indicator of early genetic esffects for pesticide-exposed populations.

• 한국컴퓨터산업학회논문지
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• 제2권3호
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• pp.407-416
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• 2001

본 논문에서는 C++ 프로그램을 측정하기 위하여 제안된 척도 $\pi_{java}$ c++/를 기반으로 Java 프로그램 복잡도를 측정하기 위한 척도 $\pi_{java}$ Java/을 제안한다. C++를 측정하기 위해 많은 척도들이 제안되어 왔으나 이들은 Java 프로그램만이 가지는 특성들을 고려하지 않았기 때문에 C++ 프로그램과 다른 성질을 가지고 있는 Java프로그램에 이들을 그대로 적용하는 것은 어렵다. 따라서, 본 논문에서는C++와 Java 언어의 공통점과 차이점을 분석한 결과와 본 연구팀이 C++ 프로그램의 복잡도를 측정하기 위해 제안했던 척도 $\pi_{java}$ c++/을 바탕으로 Java 프로그램의 복잡도를 측정하기 위한 새로운 척도 $\prod$$_{Java}$을 제안한다. 마지막으로 제안한 척도를 Weyuker의 성질에 적용하여 분석하며, 기존의 척도들과도 비교한다.

• 한국콘텐츠학회논문지
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• 제7권8호
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• pp.134-141
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• 2007

3D 애니메이션 작업의 결과물을 출력하는데 있어서 동영상 파일로의 렌더링이 가능하지만 대부분의 프로덕션에서는 Image Sequence 렌더링 방식을 택하고 있다. 이러한 Image Sequence 렌더링 방식은 최종 영상물 제작을 위한 합성에 있어서 중요한 과정이다. 이러한 Image Sequence 렌더링 방식에는 다양한 Format의 이미지 형태들이 사용되는데 그 대표적인 것으로서 TGA format을 들 수가 있다. 하지만 TGA format 방식의 이미지가 이러한 과정에서 최적인가에 대한 의문점이 제기되어지고, 3D 프로그램마다 고유의 이미지 format을 가지고 있다는 점에서 이에 대한 연구가 필요하다. 본 연구에서는 Alias 사의 Maya를 중심으로 이러한 Image Sequence format에 대한 압축률, 선명도, 합성 시 필요한 Alpha Channel의 보존성, Z-Depth에 관한 Information에 관하여 연구하고자 한다. 이 연구의 결과는 3D 애니메이션을 Pipeline에 Image Sequence format에 대한 가이드 라인을 제공해주는데 목적이 있다.

• 한국안전학회지
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• 제30권5호
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• pp.74-79
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• 2015

The purpose of this study is to find out its effect on changes in the joint angle and the success rate of cardiopulmonary resuscitation by conducting cardiopulmonary resuscitation (CPR) when wearing and not wearing PPE (personal protective equipment) targeting 20 paramedics with more than 5 years of experience. The subjects carried out CPR in 30:2 for 4 minutes and collected images were digitized by Kwon3D XP Software Package(Version 4.0) and then data were obtained. Data, which were collected by analyzing the motion when starting in one cycle, when pressing to the maximum, in the final position (relaxed), were analyzed by using SPSS 18.0. In conclusion, during CPR, the angle of the both shoulder joints was not significant (p>.05) and the angle of the right elbow joint was reduced in all positions and was statistically significant (p<.05) and the angle of the left was significantly reduced in the maximum pressure posture and the final position (p>.05). In the case of the trunk, the angle increased statistically significantly at all stages (p<.01, p<.001). Also, during CPR, the average compression rate was significantly reduced after wearing PPE (p<.05) and average hand escape time by cycle increased statistically significantly (p<.05) but chest compression execution rate at the correct depth did not show any significant difference between the two groups (p>05).

• 터널과지하공간
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• 제13권6호
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• pp.465-475
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• 2003

본 논문은 지하공동이 건설되는 지역을 대상으로 공동내 지하수 유입량을 계산하기 위하여 영국의 AEA Technology에서 개발한 NAPSAC과 NAMMU를 이용하여 수치 모델링을 실시하였다. 이것은 3차원의 파쇄된 매질에서 지하수 유동에 대하여 아주 유효한 유한요소 소프트웨어 패키지이다. 모델링에 사용된 입력자료는 지표조사, 시추조사, 단일공 수리시험 자료 등을 이용하여 산출하였다. 공동내 지하수 유입량을 보다 정확히 산출하기 위하여 이방성 수리전도도를 고려하였으며 이방성 수리전도도값은 연구지역에 분포하는 균열체계의 확률적 분포특성이 반영된 균열망에서 역산되었다. 연속체 개념의 수치모델링을 통하여 평수기, 갈수기와 풍수기시의 지하 공동내 유입량, 유동시간, 유동경로의 변화를 계산하였다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2008년도 학술발표회 논문집
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• pp.389-394
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• 2008

The purpose of this research was to develop a methodology to determine whether conjunctive surface water and groundwater management could significantly reduce deficits in a river basin with a relatively limited alluvial aquifer. The Geum River basin is one of major river basins in South Korea. The upper region of the Geum River basin is typical of many river basins in Korea where the shape of river basin is narrow with small alluvial aquifer depths from 10m to 20m and where most of the groundwater pumped comes quickly from the steamflow. The basin has two surface reservoirs, Daecheong and Yongdam. The most recent reservoir, Yongdam, provides water to a trans-basin diversion, and therefore reduces the water resources available in the Geum River basin. After the completion of Yongdam reservoir, the reduced water supply in the Geum basin resulted in increasing conflicts between downstream water needs and required instream flows, particularly during the low flow season. Historically, the operation of groundwater pumping has had limited control and is administered separately from surface water diversions. Given the limited size of the alluvial aquifer, it is apparent that groundwater pumping is essentially taking its water from the stream. Therefore, the operation of the surface water withdrawals and groundwater pumping must be considered together. The major component of the conjunction water management in this study is a goal-programmin g based optimization model that simultaneously considers surface water withdrawals, groundwater pumping and instream flow requirements. A 10-day time step is used in the model. The interactions between groundwater pumping and the stream are handled through the use of response and lag coefficients. The impacts of pumping on streamflow are considered for multiple time periods. The model is formulated as a linear goal-programming problem that is solved with the commercial LINGO optimization software package.