• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1999년도 제14차 학술회의논문집
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• pp.57-60
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• 1999

An optimal control technique designed for simultaneous tracking and quality control for batch processes. The proposed technique is designed by transforming quadratic-criterion based iterative learning control(Q-ILC) into linear quadratic control problem. For real-time quality inferential control, the quality is modeled by linear combination of control input around target qualify and then the relationship between quality and control input can be transformed into time-varying linear state space model. With this state space model, the real-time quality inferential control can be incorporated to LQ control Problem. As a consequence, both the quality variable as well as other controlled variables can progressively reduce their control error as the batch number increases while rejecting real-time disturbances, and finally reach the best achievable states dictated by a quadratic criterion even in case that there is significant model error Also the computational burden is much reduced since the most computation is calculated in off-line. The Proposed control technique is applied to a semi-batch reactor model where series-parallelreactions take place.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.301-304
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• 1997

Two options arising during implementation of an advanced model-based control system on a process with low-level loops are discussed. Strengths and deficiencies of the options are examined and methods to overcome the deficiencies are proposed. Simulation results of a CSTR and distillation column are presented to demonstrate the performance improvements.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1994년도 Proceedings of the Korea Automatic Control Conference, 9th (KACC) ; Taejeon, Korea; 17-20 Oct. 1994
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• pp.1.2-6
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• 1994

A state or the arts in Japanese chemical process control is reviewed based on experience in applying advanced process control schemes to several industrial chemical processes. The applications validate model predictive control (MPC), the most popular advanced control scheme in the process control community, as, indeed, a powerful and practical control algorithm. However, at the same time, it is elucidated that MPC can solve only the control algorithm part of the problem and one needs chemical and systems engineering aspects to solve the entire problem. By illustrating several industrial process control problems, the need for chemical engineering aspects as well as the future direction for process control are addressed, especially in light or current attitudes toward product quality.

• 한국보육지원학회지
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• 제8권5호
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• pp.157-177
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• 2012

본 연구는 프로젝트 활동이 유아의 사고력 증진에 미치는 효과를 알아보는데 그 목적이 있다. 연구의 대상으로는 경기도의 S유치원에 재원하고 있는 유아 60명을 선정하였다. 선정된 유아들을 프로젝트 활동을 적용한 실험집단에 30명, 적용하지 않은 비교집단에 30명을 배정하고, 이들의 사고력을 비교 분석하였다. 프로젝트 접근법이 유아의 사고력과 하위구성요소인 지각적 사고, 분석적 사고, 종합적 사고, 추리적 사고에 미치는 영향을 살펴본 결과, 프로젝트 활동을 실시한 유아가 그렇지 않은 유아보다 지각적 사고, 분석적 사고, 종합적 사고, 추리적 사고가 높은 것으로 파악되었다. 따라서 프로젝트 접근법은 유아로 하여금 다양한 활동을 통하여 표상, 재표상의 단계를 거쳐 새로운 지식을 재구성함으로써 유아의 사고력 증진에 효과적이라고 할 수 있다.

• Asian Journal of Business Environment
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• 제10권1호
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• pp.37-43
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• 2020

Purpose: The purpose of this study was to examine the relationship between portfolio quality and financial sustainability of microfinance institutions in Kenya. Research Design, Data, and Methodology: The analysis was based on a panel dataset of 30 microfinance institutions for the period of 2010 to 2018. Data was obtained from the Microfinance information exchange (MIX) database, and it was analyzed through descriptive and inferential statistics with the aid of STATA. Based on the results of the Hausman test, the study adopted the fixed effect regression model to test the research hypothesis. Results: The study found that portfolio quality had a positive significant effect on financial sustainability of Microfinance institutions in Kenya (β= 0. 211; p-value < 0.05). For the control variables; firm age had a positive effect (β= 0.773; p-value <0.05), while firm size (β= -0. 749; p-value < 0.05) had a negative effect on financial sustainability. Conclusions: The study concluded that portfolio quality has an important influence on the financial sustainability of microfinance institution. The study recommends that managers of microfinance institutions should devise good collection policies to improve portfolio quality while lessening loan default rate. The portfolio quality may improve the overall profitability and enhance investor confidence in their strategic decision-making on refinancing.

• Journal of Preventive Medicine and Public Health
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• 제54권4호
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• pp.275-283
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• 2021

Objectives: The workplace is an ideal place for encouraging health-promoting behaviors. Therefore, the aim of the present study was to determine the effect of an empowerment program on the health-promoting behaviors of women workers. Methods: This randomized clinical trial was conducted with 80 women workers employed at a food packaging facility in 2020. The subjects were selected using convenience sampling and were classified into intervention and control groups using block randomization. An empowerment program for women workers was conducted across 6 sessions based on an empowerment model. Data collection tools included a demographic questionnaire and the Health Promoting Lifestyle Profile-II, which participants completed both before the program and 8 weeks after the last session. Data analysis was performed in SPSS version 16 using descriptive analysis and inferential statistics. Results: There were no significant differences between the 2 groups in various health-promoting behaviors before the program. However, the intervention group's scores for nutrition (34.92±1.09 vs. 27.87±4.23), physical activity (24.40±2.94 vs. 17.40±5.03), stress management (26.35±2.60 vs. 23.05±4.27), spiritual growth (34.02±3.00 vs. 30.22±5.40), interpersonal relationships (30.82±2.38 vs. 27.60±4.61), and health responsibility (31.60±2.71 vs. 28.22±4.59) were significantly higher than the control group's 8 weeks after the program had ended. Moreover, there was a significant difference in the total score of health-promoting behaviors for the intervention group compared to the control group (179.00±9.22 vs. 151.42±20.25, p=0.001). Conclusions: An empowerment program for women workers led to significant improvements in the health-promoting behaviors of the participants. Similar programs can ultimately improve women's health in the workplace.

• Asian Pacific Journal of Cancer Prevention
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• 제17권7호
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• pp.3505-3510
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• 2016

Cervical cancer is a major public health problem in Thailand, being ranked second only to breast cancer. Thai women have been reported to have a low rate of cervical cancer screening (27.7% of the 80% goal of WHO). We therefore aimed to apply the social marketing theory and health belief model in promoting cervical cancer screening in Kanthararom District, Sisaket Province. A total of 92 from 974 targeted women aged 30-60 years were randomly divided into two groups. The experimental group underwent application of social marketing theory and a health belief model program promoting cervical cancer screening while the control group received normal services. Two research tools were used: (1) application of social marketing theory and health belief model program and (2) questionnaire used to evaluate perceptions of cervical cancer. Descriptive and inferential statistics including paired sample t-test and independent t-test were used to analyze the data. After the program had been used, the mean score of perception of cervical cancer of experimental group was at a higher level (${\bar{x}}=4.09$; S.D.=0.30), than in the control group (${\bar{x}}=3.82$; S.D.=0.20) with statistical significance (p<0.001). This research demonstrated an appropriate communication process in behavioral modification to prevent cervical cancer. It can be recommended that this program featuring social marketing and the health belief model be used to promote cervical cancer screening in targeted women and it can be promoted as a guideline for other health services, especially in health promotion and disease prevention.

• 교육심리연구
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• 제22권1호
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• pp.215-234
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• 2008

이 연구는 학습자의 받아쓰기 성취도와 독해력을 향상시키고 흥미를 유발하는 교수 학습 방법으로서 만화와 문자 빈칸 메우기 전략의 효과를 살펴보고자 실시되었다. 초등학교 1학년 학급 중 교과 흥미 사전검사와 국어과 읽기 학업성취 사전평가에서 동질성을 확보한 3개 학급을 선정하여, 실험집단 1은 만화 텍스트 빈칸 메우기 전략, 실험집단 2는 문자 텍스트 빈칸 메우기 전략을 활용하여 읽기 학습을 실시하였으며, 통제집단은 기존의 교과서 위주의 읽기 학습을 실시하도록 하여 총 15차시에 걸쳐 수업을 진행하였다. 실험 결과 첫째, 만화 텍스트 빈칸 메우기 전략의 활용은 교과흥미에 긍정적인 효과를 미쳤으며, 특히 하위 성취도 집단에서 더 큰 효과를 보였다. 둘째, 빈칸 메우기 전략의 활용은 사후 받아쓰기 성취도 및 지연된 받아쓰기 성취도에 긍정적인 영향을 미치며, 특히 하위 성취도 집단에서는 만화 텍스트의 활용이 더 효과적이었다. 셋째 직후 독해력 검사에서는 텍스트 유형에 상관없이 빈칸 메우기 전략을 활용한 읽기 학습이 독해력에 긍정적인 효과를 보였으며, 독해력 하위 요소 중 사실적 이해를 묻는 문항보다 추론적 이해를 묻는 문항에서 더욱 긍정적인 효과를 나타냈다. 이러한 연구결과를 통해 국어 읽기 학습에서 흥미 유발 및 학업성취도에 긍정적인 영향을 미치는 텍스트의 유형과 학습 전략에 대한 시사점도 논의하였다.

• Korean Chemical Engineering Research
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• 제52권5호
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• pp.592-602
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• 2014

석탄 가스화 복합 발전(coal-based IGCC power plant)에서 가스화기의 동적 상태와 성능이 플랜트 전체에 큰 영향을 미치므로, 가스화기가 문제 없이 운전 되도록 제어 하는 것은 전체 플랜트의 가동률을 높이는 데 있어 매우 중요한 일이라 할 수 있다. 가스화기의 안정적인 운전을 위해서는 고체 슬래그 층의 두께가 일정하게 유지되어야 하는데, 고체 슬래그 두께는 실시간 측정이 불가능하기 때문에 상태를 추정하여 추론 제어해야 한다. 본 연구에서는 Shell-type 가스화기의 동적 모사 모델을 개발하고 다변수 시스템의 추론 제어를 위한 방법으로 두 가지 선형 예측 제어 기법을 적용하여 그 특성을 분석하였다. 측정되지 않는 변수의 상태 추정을 위해 Kalman 필터 기법을 이용하였다. 측정 불가능한 1차 변수를 대신하여 측정 가능한 2차 변수를 제어하는 전통적인 추론 제어 기법으로는 외란의 종류에 따라 추론 제어가 불가능 할 수 있음을 확인하였고, 측정되지 않는 슬래그 두께를 Kalman 필터 기법을 이용하여 추정하여 성능 예측에 반영하고 외란 모델을 사용하여 예측 제어하는 경우 두 가지 측정 불가능한 외란 모두에 대해 추론 제어가 가능함을 확인하였다.

• Asian Pacific Journal of Cancer Prevention
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• 제16권11호
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• pp.4699-4704
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• 2015

Medical diagnostic X-ray workers are one occupational group that expose to the long-term low-dose external radiation over their working lifetime, and they may under risk of different cancers. This study aims to determine the relationship between the occupational X-ray radiation exposure and cancer risk among these workers in Jiangsu, China. We conducted Nested case-control study to investigate the occupational X-ray radiation exposure and cancer risk. Data were collected through self-administered questionnaire, which includes but not limits to demographic data, personal behaviors and family history of cancer. Retrospective dose reconstruction was conducted to estimate the cumulative doses of the x-ray workers. Inferential statistics, t-test and 2 tests were used to compare the differences between each group. We used the logistic regression model to calculate the odds ratio (OR) and 95% confidence interval (CI) of cancer by adjusting the age, gender. All 34 breast cancer cases and 45 esophageal cancer cases that detected in a cohort conducted among health workers between 1950~2011 were included in this presented study, and 158 cancer-free controls were selected by frequency-matched (1:2). Our study found that the occupational radiation exposure was associated with a significantly increased cancer risk compared with the control, especially in breast cancer and esophageal cancer (adjusted OR=2.90, 95% CI: 1.19-7.04 for breast cancer; OR=4.19, 95% CI: 1.87-9.38 for esophageal cancer, and OR=3.43, 95% CI: 1.92-6.12 for total cancer, respectively). The occupational X-ray radiation exposure was associated with increasing cancer risk, which indicates that proper intervention and prevention strategies may be needed in order to bring down the occupational cancer risk.