• Journal of Information Processing Systems
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• 제11권4호
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• pp.616-629
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• 2015

A mobile terminal will expect a number of handoffs within its call duration. In the event of a mobile call, when a mobile node moves from one cell to another, it should connect to another access point within its range. In case there is a lack of support of its own network, it must changeover to another base station. In the event of moving on to another network, quality of service parameters need to be considered. In our study we have used the Markov decision process approach for a seamless handoff as it gives the optimum results for selecting a network when compared to other multiple attribute decision making processes. We have used the network cost function for selecting the network for handoff and the connection reward function, which is based on the values of the quality of service parameters. We have also examined the constant bit rate and transmission control protocol packet delivery ratio. We used the policy iteration algorithm for determining the optimal policy. Our enhanced handoff algorithm outperforms other previous multiple attribute decision making methods.

• 공학교육연구
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• 제21권3호
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• pp.20-30
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• 2018

The purpose of this study is to analyze the characteristics of college students majoring in the engineering on career decision difficulties and emotional and personality career difficulties. Data is consisted of 430 college students. We tested the research question by employing the PSM and the multi-regression model. The result showed that college students majoring in the engineering have difficulties in the information about self, the lack of information, and the outside control on career decision more than others. We suggested that career education and counseling of understanding themselves such as interesting, aptitude, and occupational value should be provided for students majoring in the engineering.

• 품질경영학회지
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• 제46권3호
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• pp.739-752
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• 2018

Purpose: The purpose of this study was to investigate the relationship between kiln processing parameters and NOx emissions that occur in the sintering and calcination steps of the cement manufacturing process and to derive the main factors responsible for producing emissions outside emission limit criteria, as determined by category models and classification rules, using data mining techniques. The results from this study are expected to be useful as guidelines for NOx emission control standards. Methods: Data were collected from Precalciner Kiln No.3 used in one of the domestic cement plants in Korea. Thirty-four independent variables affecting NOx generation and dependent variables that exceeded or were below the NOx emiision limit (>1 and <0, respectively) were examined during kiln processing. These data were used to construct a detection model of NOx emission, in which emissions exceeded or were below the set limits. The model was validated using SPSS MODELER 18.0, artificial neural network, decision treee (C5.0), and logistic regression analysis data mining techniques. Results: The decision tree (C5.0) algorithm best represented NOx emission behavior and was used to identify 10 processing variables that resulted in NOx emissions outside limit criteria. Conclusion: The results of this study indicate that the decision tree (C5.0) can be applied for real-time monitoring and management of NOx emissions during the cement firing process to satisfy NOx emission control standards and to provide for a more eco-friendly cement product.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2007년도 정기학술발표대회 논문집
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• pp.103-109
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• 2007

다중이용시설물에서 이용객의 안전을 책임지는 관리자들은 인간의 판단에 의존한 (human-based) 의사결정과정을 통해서 자신들의 과업과 관련된 의사결정을 내린다. 그러나 이 과정 속에는 인적과오(human error) 발생으로 인한 인재 발생의 가능성이 상존하고 있다. 이러한 현상은 관리자의 의사결정 과정을 지원하기 위한 기술 기반(technology-based) 의사결정지원체계를 구축함으로써 개선할 수 있다. 3D CAD와 3D GIS 기술 등의 공간관리 기술과 이미지 프로세싱 기술 등 첨단 IT기술들의 컨버전스를 통해 구축된 공간 관리 시스템은 관리자들에게 프로액티브한 상황 정보를 제공해 주어, 재난상황에 대해 미리 대책을 수립하여 실시간으로 대응하게 해 줌으로서 궁극적으로 인재 발생의 가능성을 줄일 수 있는 여지가 있다. 본 고는 이러한 니즈에 기인하여 개발하고자 하는 미래형 실시간 SICS의 개괄적인 연구개발 방법, 지금까지 진행된 연구의 결과, 차년도 연구 계획, 연구 개발을 통한 기대효과 등을 소개하고 있다.

• 한국수자원학회논문집
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• 제30권5호
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• pp.431-439
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• 1997

본 연구의 목적은 다목적 조수지의 홍수조절능력을 극대화하기 위한 홍수시 실시간 저수지운영 의사결정 지원 시스템을 개발하는 것이다. 본 연구를 통해 개발된 의사결정 지원시스템은 모델베이스와 실시간 자료처리 부시스템, 사용자 인터페이스로 구성되어 있으며, 사용자 인터페이스는 모형에 의해 예측된 홍수조절지점의 수문곡선과 저수지의 저수위 그래프르 그래픽 형태로 보여줄 수 있도록 개발되었다. 개발된 시스템의 적용성을 검증하기 위하여 금강유역의 1987년 7월 및 1995년 8월의 과거 홍수 사상을 가상 실시간으로 대청댐 저수지 운영에 적용하여 의사결정과정을 수행하고, 당시의 운영 실적과 비교·검토하였다. 개발된 시스템의 의한 저수지 운영은 홍수유출모형에 의해 모의되었으며, 그 결과 본 시스템에 의한 저수지운영은 금강하류의 홍수조절에 기여할 수 있는 것으로 나타났다.

• 문화기술의 융합
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• 제9권6호
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• pp.615-625
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• 2023

본 연구는 보완대체요법을 활용한 긍정심리프로그램 중재를 통하여 간호대학생의 정신적, 사회 심리적 건강향상을 위하여 시도되었다. 보완대체요법을 활용한 긍정심리프로그램을 제공받은 간호대학생을 실험군으로 프로그램을제공받지 않은 간호대학생을 대조군으로 선정하여 간호대학생의 부정적 정서(우울, 불안, 스트레스), 진로결정 자기효능감, 자기자비, 플로리시에 미치는 효과를 검증하기 위한 비 동등성 대조군 전후 유사실험 설계를 적용한 연구이다. 수집된 자료는 SPSS Version 21.0 프로그램을 이용하여 분석하였다. 실험군은 교육에 참여하지 않은 대조군보다 진로결정 자기효능감, 자기자비, 플로리시 점수가 높았고, 부정적 정서 점수가 낮은 것으로 나타났다. 보완대체요법을 활용한 긍정심리프로그램을 적용한 후 진로결정 긍정적인 연구 효과를 보고함으로 보완대체요법을 활용한 간호중재영역 확대에 기여하였다.

• 지역사회간호학회지
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• 제6권1호
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• pp.5-33
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• 1995

The objective of the study are two-fold: one is to explore the relationship between environment, organizational structure, and organizational effectiveness of public health centers in Korea, and the other is to examine the validity of contingency theory for improving the organizational structure of public health care agencies, with special emphasis on public health nursing administration. Accordingly, the conceptual model of the study consisted of three different concepts: environment, organizational structure, and organizational effectiveness, which were built up from the contingency theory. Data were collected during the period from 1st of May through 30th of June, 1990. From the total of 249 health centers in the country, one hundred and five centers were sampled non proportionally, according to the geopolitical distribution. Out of 105, 73 health centers responded to mailed questionnaire. The health centers were the unit of the study, and a various statistical analysis techniques were used: Reliability analysis(Cronbach's Alpha) for 4 measurement tools; Shapiro-Wilk statistic for normality test of measured scores of 6 variables: ANOVA, Pearson Correlaion analysis, regressional analysis, and canonical correlation analysis for the test of the relationships and differences between the variables. The results were. as follows : 1. No significant differences between forma lization, decision-making authority and environmental complexity were found(F=1.383, P=.24 ; F=.801, P=.37). 2. Negative relationships between formalization and decision-making authority for both urban and rural health centers were found(r=-.470, P=.002 ; r=-.348, P=.46). 3. No significant relationship between formalization and job satisfaction for both urban and rural health centers were found (r=-.242, P=.132, r=-.060, P=.739). 4. Significant positive relationship between decision - making authority and job satisfaction were found in urban health centers (r=.504, P=.0009), but no such relationship was observed in rural health centers. Regression coefficient between them was statistically significant($\beta=1.535$, P=.0002), and accuracy of regression line was accepted (W=.975, P= .420). 5. No significant relationships among formalization and family planning services, maternal health services, and tuberculosis control services for both urban and rural health centers were found. 6. Among decision-making authority and family planning services, maternal health services, and tuberculosis control services, significant positive relationship was found between de cision-making authority and family planning services(r=.286, P=.73). 7. A significant difference was found in maternal health services by the type of health centers (F=5.13, P=.026) but no difference was found in tuberculosis control services by the type of health centers, formalization, and decision-making authority. 8. A significant positive relationships were found between family planning services and maternal health services and tuberculosis control services, and between maternal health services and tuberculosis control services (r=-.499, P=.001 ; r=.457, P=.004 ; r=.495, P=.002) in case of urban health centers. In case of rural health centers, relationships between family planning services and tuberculosis control services, and between maternal health services and tuberculosis control services were statistically significant (r=.534, P=.002 ; r=.389, P=.027). No significant relationship was found between family planning and maternal health services. 9. A significant positive canonical correlation was found between the group of independent variables consisted of formalization and de cision-making authority and the group of dependent variables consisted of family planning services, maternal health services and tuberculosis control services(Rc=.455, P=.02). In case of urban health centers, no significant canonical correlation was found between them, but significant canoncial correlation was found in rural health centers(Rc=.578, P=.069), 10. Relationships between job satisfaction and health care productivity was not found significant. Through these results, the assumed relationship between environment and organizational structure was not supported in health centers. Therefore, the relationship between the organizational effectiveness and the congruence between environment and organizational structure that contingency theory proposes to exist was not able to be tested. However decision-making authority was found as an important variable of organizational structure affecting family planning services and job satisfaction in urban health centers. Thus it was suggested that decentralized decision making among health professionals would be a valuable strategy for improvement of organizational effectiveness in public health centers. It is also recommended that further studies to test contingency theory would use variability and uncertainty to define environment of public health centers instead of complexity.

• 한국컴퓨터정보학회논문지
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• 제6권1호
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• pp.113-118
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• 2001

본 연구는 전산화된 제조관리 시스템의 운영을 위한 관련 소프트웨어의 합리적 선정을 목적으로 한다. 제조관리 시스템의 운용 소프트웨어는 구입비용이 대단히 크고 또한 공장 시스템의 환경에 적용 가능하여야 하기 때문에 자동화 제조관리 시스템의 운용 소프트웨어에 대한 합리적 선정이 생산성과 제조비용의 절감에 있어서 매우 중요하다. 본 연구는 다기준 의사결정모형을 이용한 제조관리 시스템의 운용을 위한 소프트웨어의 합리적 선정에 대한 방법을 제시하고 수치예제에 의해 타당성을 분석하였다.

• 산업공학
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• 제13권1호
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• pp.92-99
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• 2000

Conflicts and interruptions caused by resource failures and rush orders require a nonlinear dynamic production management. Generally the PP&C systems used in industry presently do not meet these requirements because of their rigid concepts. Starting with the grasp of the disadvantages of current approaches, this paper presents a control structure that enables system to react to various malfunctions using a planning tolerance concept. Also, production processes are modeled by using Fuzzy-Petri-Net modeling tool in other to handle the complexity of job allocation and the existence of many disparities. On the basis of this model the developed system support the short-term shop control by rule based decision.

• 산업공학
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• 제24권4호
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• pp.396-407
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• 2011

We develop a cash management model in which firms face randomly occurred investment projects and retrieve investments upon the maturity of these projects. Using the Markov Decision Problem approach, we examine a control policy which dynamically adjusts the cash balance under the discounted cost criterion. The existence of an optimal policy is shown under some conditions. The optimal solution procedure is developed to find the optimal points and the optimal sizes for adjusting the cash balance. In numerical experiment, we investigate important structural properties of the optimal cash management policy.