• 한국직업건강간호학회지
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• 제4권호
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• pp.30-38
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• 1995

The purpose of this study was to evaluate the effect of health services on workers with hypertension in small and medium sized enterprises (20-300 employees). One hundred seventy three workers among 296 workers with hypertension were responded to the questionnaire on general and occupational characteristics, health habits and anti-hypertensive medications. Blood pressure was obtained while seated using a calibrated standard manometer before and after 4 months health services. Statistical analysis was performed using $X^2$-test and logistic regression analysis. The results were as follows ; 1. No significant differences were noted in variables of smoking, glucose intake and sleeping time, while significant differences were showed in variables of exercise time, frequency and amount of drinking and intake of salt, protain, lipid, calcium, vegetable and fruits between groups which was provided and not provided health services. 2. The rate of anti-hypertensive medication was increased and the blood pressure was decreased significantly in group which was provided health services compared with those of group which was not provided. 3. With the logistic regression analysis, significant variables affecting blood pressure change were smoking and anti-hypertensive medication. The results of this study suggested that health services on workers with hypertension in small and medium sized enterprises was effective, and the role of health professionals for health promotion movement in enterprises was important.

• 아동학회지
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• 제35권1호
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• pp.43-60
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• 2014

This study examined the influence of children's self-concept, self-efficacy, self-resiliency and school adjustment on life satisfaction. Data were collected from 582 fifth and sixth graders in Seoul and Gyeonggi-do. The results of this study are as follows. First, self-concept, self-efficacy, and school adjustment were all confirmed as variables that had direct or indirect influence on life satisfaction. Of these, it was found that school adjustment and self-resiliency turned out to have a more direct influence on children's life satisfaction. Second, as for the greatness of direct influence on school adjustment, which mediates the ego-related variables and life satisfaction, self-efficacy, self-resilience, and self-concept proved to be greater in that order. Third, self-concept turned out to be the variable that had the greatest influence on school adjustment and life satisfaction when taking into consideration of both the direct and indirect influence. It was confirmed that it could be more effective to compose an intervention method for the promotion of life satisfaction case by case for short term goals.

• 한국환경생태학회지
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• 제19권2호
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• pp.139-143
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• 2005

본 연구는 월악산국립공원을 방문한 탐방객들의 탐방만족도를 통하여 만족요인과 예측모형 을 분석하여 효율적인 공원관리의 기초자료를 제공하는데 있다. 만족도에서는 이용료부담감, 시설청결 및 부족, 바가지요금, 쓰레기 문제에 다소 불만족하는 것으로 나타났다. 만족요인으로는 '일반관리요인'이 만족도에 가장 큰 영향을 미치는 것으로 나타났고, 예측모형에 있어서도 휴양활동의 안전, 주차문제, 쓰레기 문제 등이 만족도에 큰 영향을 미치는 변수인 것으로 나타났다.

• 한국환경생태학회지
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• 제20권2호
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• pp.153-158
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• 2006

본 연구는 월출산국립공원 탐방객들의 탐방후 평가를 통하여 만족도, 만족요인과 예측모형을 분석하여 바람직한 공원관리의 기초자료를 제공하는데 그 목적이 있다. 만족도에서는 '탐방프로그램의 부족'이 가장 높았고 시설 부족, 탐방료 부담감과 탐방 팸플릿 및 안내시설 부족 등에 다소 불만족하는 것으로 나타났다. 만족요인으로는 '시설관리요인'과 '경상관리요인'이 만족도에 가장 큰 영향을 미치는 것으로 나타났고, 만족도 예측모형에 있어서는 등산로 훼손 및 안전시설 부족 등 공원의 특성과 부합되는 변수가 만족도에 가장 큰 영향을 미치는 것으로 나타났다.

• 한국벤처창업학회:학술대회논문집
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• 한국벤처창업학회 2010년도 통합학술대회
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• pp.93-112
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• 2010

Consumers show higher interest in fishery products processed food that are effective for the personal health and good for convenience, nourishment and taste. But current domestic research for fishery products processed food is marginal. In this respect, this research systematically analyzes consumers' consumption patterns and relationship to comsumer's pursuable benefit, reference for selection, satisfaction level and purpose of purchase. This research shows results as following. Consumers consider product information the most important in reference for selection, and convinience the highest in pursuable benefit. And this research analyze influence of reference for selection and pursuable benefit on satisfaction level and purpose of purchase using demographic properties as control variables. The variables which affect satisfaction level are residential district(region), recipe, nutrient, convenience, economy and the variables affect purpose of purchase are nutrient, convenienct, satisfaction level. If this result is used to develop new products and industrialize fishery products processed food, consumer market of fishery products processed food can be expanded. And this result can be utilized as fundamental reference for sales promotion.

• 한국기계가공학회지
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• 제8권3호
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• pp.46-53
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• 2009

To find the working condition is one of the important factors in precision machining. In this study, we analyzed maximum working temperature by infra-red camera and surface roughness in side wall end milling using design of experiment (DOE): RSM(response surface methodology), ANOM(analysis of means) and ANOVA(analysis of variance) by table of orthogonal array. ANOM and ANOVA are well adapted to select sensitivity of design variables for maximum working temperature and surface roughness. The effective design variables and their levels should be determined using ANOM, ANOVA. RSM is presented 2nd order approximation polynomial of maximum working temperature and surface roughness is composed with design variables. Therefore, it is expected that the proposed procedure using design of experiment : table of orthogonal array, ANOM, ANOVA and RSM can be easily utilized to solve the problem of working condition.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 1999년도 추계학술대회 논문집
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• pp.63-69
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• 1999

The research trend of the simulation optimization has been focused on exploring continuous decision variables. Yet, the research in discrete decision variable area has not been fully studied. A new research trend for optimizing discrete decision variables ha just appeared recently. This study, therefore, deals with a discrete simulation method to get the system evaluation criteria required for designing a complex probabilistic discrete event system and to search the effective and reliable alternatives to satisfy the objective values of the given system through a on-line, single run with the short time period. Finding the alternative, we construct an algorithm which changes values of decision variables and a design alternative by using the stopping algorithm which ends the simulation in a steady state of system. To avoid the loss of data while analyzing the acquired design alternative in the steady state, we provide background for estimation of an auto-regressive model and mean and confidence interval for evaluating correctly the objective function obtained by small amount of output data through simulation with the short time period. In numerical experiment we applied the proposed algorithm to (s, S) inventory system problem with varying Δt value. In case of the (s, S) inventory system, we obtained good design alternative when Δt value is larger than 100.

• International Journal of CAD/CAM
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• 제7권1호
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• pp.41-49
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• 2007

In density-based topology optimization, 0/1 solutions are sought. Discrete topological problems are often relaxed with continuous design variables so that they can be solved using continuous mathematical programming. Although the relaxed methods are practical, grey areas appear in the optimum topologies. SIMP (Solid Isotropic Microstructures with Penalization) employs penalty schemes to suppress the intermediate densities. SRV (the Sum of the Reciprocal Variables) drives the solution to a 0/1 layout with the SRV constraint. However, both methods cannot effectively remove all the grey areas. SRV has some numerical aspects. In this work, a new scheme SIMP-SRV is proposed by combining SIMP and SRV approaches, where SIMP is employed to generate an intermediate solution to initialize the design variables and SRV is then adopted to produce the final design. The new method turned out to be very effective in conjunction with the method of moving asymptotes (MMA) when using for the stiffness topology optimization of continuum structures for minimum compliance. The numerical examples show that the hybrid technique can effectively remove all grey areas and generate stiffer optimal designs characterized with a sharper boundary in contrast to SIMP and SRV.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2004년도 제22회 춘계학술대회논문집
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• pp.742-748
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• 2004

In this paper are presented TSTO system analysis including some controlled variables on the engine operation such as a fuel flow rate and a pressure ratio of compressor, as well as variables on the trajectory. TSTO studied here is accelerated up to Mach 6 by a fly-back booster powered by air breathing engines. Three different types of engine cycle were treated for propulsion system of the booster, such as a turbo ramjet, a precooled turbojet and an EXpander cycle Air Turbo Ramjet (ATREX). The history of the controlled variables on the engine operation was optimized by Sequential Quadratic Programming (SQP) to accomplish the minimum fuel consumption. The trajectory was also optimized simultaneously. The results showed that the turbo ramjet gave the best fuel consumption. The optimal trajectory was almost the same except in the transonic range and just before reaching to Mach 6. The history of the pressure ratio of compressor considerably depended on the engine type. It is concluded that simultaneous optimization for engine control and trajectory is effective especially for a high-speed airplane propelled by turbojets like the TSTO booster.

• 한국항공운항학회지
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• 제23권3호
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• pp.53-63
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• 2015

This paper tries to find out antecedents and consequences of innovation ambidexterity among companies residing in the airport. To define antecedents, this paper regards such four variables as relationship orientation, market orientation, dynamic capabilities and level of resources. Such variables are assumed to have an effect on innovative ambidexterity and the innovative ambidexterity is also presumed to have an impact on company's marketing consequences. According to hypothesis test, the more a company has relationship orientation, market orientation, dynamic capabilities and level of resources, the more effective an innovation ambidexterity becomes and the bigger marketing performance could be expected. Therefore companies ought to maintain both exploration and utilization perspectives of innovation ambidexterity following the four variables above to expand new customer market and increase revenues.