• 대한토목학회논문집
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• 제14권4호
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• pp.887-896
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• 1994

일반적으로 다목적댐을 대상으로 하는 최적운영모형에 이용되는 각종 추계학적 모의 모형은 주로 저수지 유입량을 모의하기 위한 모형이며, 시스템으로부터의 용수수요량과 같은 변수들은 일정한 값을 가진다고 가정한다. 그러나 특수한 목적의 저수지의 경우 시스템 구성인자들 사이에 어떤 상관성이 있다면, 이를 이용하여 각 변수들의 관계를 도출한 후, 시스템을 구성하는 것이 바람직하다. 본 연구에서는 농업용수 공급을 목적으로 하는 다목적댐을 대상으로 강우 및 기상조건에 영향을 받는 순별 저수지 유입량과 농업용수 수요량을 각각 일정변수 주기성 자기회귀모형과 일정변수 주기성 다변량 자기회귀모형을 이용하여 모의발생 하였다. 유도된 모형은 각 변수의 통계화적 특성을 잘 나타내며, 농업용수 수요량의 경우 전(前) 시간의 수요량보다는 현재 운영기간(순(旬))의 저수지 유입량과의 상관관계에 더 큰 영향을 받는 것으로 나타냈다.

• 한국산업보건학회지
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• 제26권1호
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• pp.90-98
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• 2016

Objectives: The aim of this study is to analyze the status of implementation of occupational safety and health education and evaluate the relation between the implementation of education and occupational accidents. Methods: This study used data on occupational safety and health education from the 2012 Current Status of Occupational Safety and Health survey by the Korea Occupational Safety and Health Agency. The sample is 7,010 persons working in relation to occupational safety and health in industry. An ANOVA test is used to analyze the status of and need for education. Poisson regression is used to evaluate the relation between education and occupational accidents. Results: The rate of implementation of education is 53.3% for periodic education on workers holding office positions, 68.3% for periodic education for workers not holding office positions, 60.3% for periodic education for persons holding managerial and supervisory positions, 65.5% for education provided upon hiring, 50.5% for education provided upon changes in work activities and 37.2% for special education. In the Poisson regression, these data strongly suggest that the probability of occupational accidents occurring with education implemented is much lower than without the implementation of any kind of safety and health education. Conclusions: It is clear that implementation of education has a positive effect on reducing occupational accidents, although its application in domestic industry is insufficient. Thus, it is concluded that education on occupational safety and health should be strengthened for the prevention of occupational accidents.

• 대한지역사회영양학회지
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• 제7권2호
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• pp.266-276
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• 2002

In this study, a computerized nutritional and health guide program for workers was developed. The dietitian at the work site could utilize periodically conducted medical examination data to develop an effective health care counseling model based on the developed Nutritional and Health Guide Program. A personal computer (Pentium II PC MMX-150, 32MB RAM, 2.95 GB HDD) with Microsoft Visual Basic 6.0 Enterprise Edition and Microsoft Access 97 installed, was used. The Nutritional and Health Guide Program consisted of seven main menus and 43 sub-menus. Included in the main menu were Basic Information, Periodic Health Check-ups, Visitors' Consultations, Nutritional/Health Tips, Nutritional Education according to Diseases, Help and Exit. In the Periodic Health Check-up menu, dieticians could input the health examination data of employees and touch for the recommended treatments for diseases such as obesity, diabetes, high cholesterol, hypertension and hepatitis. The Visitors'Consultation menu has been designed to compile health information about the employees who sought consultations. The Nutritional/Health Tips menu was designed to provide 14 kinds of programmed nutritional educational media and information. In the Nutritional Education According to Diseases menu, the dietitian could judge the subject's willingness to obtain treatment based on the Stage of Change Model. According, the content of the administered respective nutritional education was classified by stages. The Help menu, provide a chart of the method and procedure used as nutritional guidelines, by which the results of the health examination were classified as people in good health and those requiring special medical attention. The results of the evaluation of this program showed highly positive rates for usefulness (4.09), convenience (4.04), lettering size (4.02), interest (3.93), design (3.49). It also showed that 97.5% of the subjects thought that this program would be helpful for implementation of their company's nutritional educational program. Therefore, this menu could help dietitians plan, conduct, and evaluate their nutritional guidelines for employees. It is expected that The Nutritional and Health Guide Program developed in this study will play a role as a scientific and effective guide in conjunction with health examination results.

• 대한임상검사과학회지
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• 제49권3호
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• pp.294-299
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• 2017

이 연구의 목적은 중첩성 뇌전증을 발견하고, 처음 기록된 30분 뇌파 패턴을 통하여 경련 가능성을 알아보고자 한다. 국제표준 10~20법을 통하여 전극을 부착하였다. 2014년 1월부터 2015년 12월까지 중환자실에 입원한 경련 의심 환자를 대상으로 하였다. 뇌파의 패턴은 주기적 방전파, 전반적 주기적 방전파, 버스트 억제파, 초점 뇌전증파, 비대칭 배경파, 전반적 서파, 삼상성 형태의 일반화 된 주기적 방전파 등 7 가지 범주로 분류하였다. 원인별 분류는 5가지 범주로 구분하였다. 전체 128명 중 평균 나이는 $56.9{\pm}17.5$였고, 남:여 비율은 74:54명이였다. 평균 뇌파검사 기간은 $5.5{\pm}5.1$일 이었고 최장 33일 이였다. 주기적 방전파(N=7), 전반적 주기적 방전파(N=10), 버스트 억제파(N=6), 초점 뇌전증파(N=19), 비대칭 배경파(N=24), 전반적 서파(N=51), 3상 형태의 일반화 된 주기적 방전파(N=11)이었다. 중첩성 뇌전증 환자의 원인은 원발성 증상성(N=4), 급성원발성 증상성(N=9), 급성 증상성(N=6), 진행성 뇌병증(N=2), 열성경련(N=1)이었다. 지속적 뇌파모니터링 검사는 중첩성 뇌전증을 발견하는데 유용한 검사이고, 뇌파 패턴을 통하여 경련 발생 유무를 확인할 수 있었다.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제18권2호
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• pp.107-127
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• 2014

The goal of this note is to describe the asymptotic behaviour of problems set in cylinders when the size of them is becoming infinite. This leads to consider problems in unbounded domains as well as new singular perturbations issues.

• 호남수학학술지
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• 제37권1호
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• pp.99-112
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• 2015

In this paper we consider the periodic Cauchy problem for the generalized two-component Hunter-Saxton system with analytic initial data and we prove a Cauchy-Kowalevski type theorem for the generalized two-component Hunter-Saxton system, that establishes the existence and uniqueness of real analytic solutions.

• 충청수학회지
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• 제36권2호
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• pp.93-97
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• 2023

Let f : M → M be a diffeomorphism of two dimensional manifold M. If f has a homoclinic tangency associated to a hyperbolic periodic point p then there is a diffeomorphism g : M → M with C¹ close to f such that g is not continuum-wise expansive.

• Journal of Mechanical Science and Technology
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• 제20권12호
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• pp.2043-2051
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• 2006

This paper considered identification of vibration characteristics of flexible structure with vector channel periodic lattice filter. We present an algorithm for AR coefficients for the vector-channel lattice filters, and characteristic equation and transfer function are derived from these coefficients. Vibration lattice filter is then constructed from the vector channel lattice filter, and performance of this vibration filter is tested with a test signal which is a combination of many sine waves to compare the performance of scalar and vector channel lattice. Also it is applied to the cantilever data to identify properties of the system, such as natural frequencies and damping ratios, to show its performance.

• 대한전기학회논문지:시스템및제어부문D
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• 제51권7호
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• pp.294-301
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• 2002

A new dynamic scheduling algorithm is proposed for CAN-based real-time system in this paper. The proposed algorithm is extended from an existing EDS(Earliest Deadline Scheduling) approach having a solution to the priority inversion. Using the proposed algorithm, the available bandwidth of network media can be checked dynamically, and consequently arbitration delay causing the miss of deadline can be avoided. Also, non-real time messages can be processed with their bandwidth allocation. Full network utilization and real-time transmission feasibility can be achieved through the algorithm. To evaluate the performance of algorithm, two simulation tests are performed. The first one is transmission data measurement per minute for periodic messages and the second one is feasibility in the system with both periodic messages and non-real time message.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1492-1495
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• 2005

This paper presents a new linear-matrix-inequality-based intelligent digital redesign (LMI-based IDR) technique to match the states of the analog and the digital T-S fuzzy control systems at the intersampling instants as well as the sampling ones. The main features of the proposed technique are: 1) the affine control scheme is employed to increase the degree of freedom; 2) the fuzzy-model-based periodic control is employed; and the control input is changed n times during one sampling period; 3) The proposed IDR technique is based on the approximately discretized version of the T-S fuzzy system; but its discretization error vanishes as n approaches the infinity. 4) some sufficient conditions involved in the state matching and the stability of the closed-loop discrete-time system can be formulated in the LMIs format.