Hyo-Cheol Lee

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[Purpose] The aim of this study was to investigate the effect of an exercise intervention on the balance ability and muscle function of elderly women. [Subjects] The subjects were randomly divided into a control group (n=10) and an exercise group (n=10). [Methods] The subjects participated in an elastic band exercise program lasting for 8 weeks, exercising(More)
A self-adaptive system is able to adjust its behavior in response to its perception of the environment. One challenging issue for a self-adaptive system is to deal with its variability. The self-adaptive system should manage their diverse functionalities and behaviors and select one of them depending on the encountered environments. To handle this(More)
[Purpose] The aim of this study was to examine the effects of exercise therapy on blood lipids of obese women. [Subjects] The subjects were 24 clinically obese women. [Methods] The subjects were divided into an exercise group (n=12), and a control group (n=12). The exercise group performed exercise for 10 weeks with diet restriction. We investigated how(More)
A self-adaptive system reacts to the changing environment by modifying its functionality in relation to the encountered state of the environment. In order to adapt to a new situation, such system goes through many decision points during the adaptation process. Knowledge forms the basis of decision making within the adaptation process. There are already many(More)
Agent-based modeling and simulation is a useful method to analyze and predict the complex and dynamic behavior of a smart grid which consists of diverse stakeholders and components such as devices, services and policies. A smart grid adaptively behaves in its dynamically changed environment and evolves over time as introducing new components and modifying(More)
Trust is one of the major factors that a system needs to achieve the secure interaction. Trust can represent the social and reliability perspective of the security. This characteristic makes trust the soft security factor. There are some attempts to evaluate trust, however, they do not consider the characteristics of self-adaptive systems such as self-*(More)
[Purpose] The purpose of this study was to determine how an exercise program focusing on muscular strength could aid firefighters with chronic lower back pain. [Subjects] The research subjects were randomly assigned to two groups, the experimental group (n=8) and the control (n=8). [Methods] The experimental group performed two types of exercise programs(More)
[Purpose] This study investigated the effect of horseback riding exercise on the background electroencephalograms of elderly people who performed horseback riding for 8 weeks. [Subjects] Twenty elderly people were divided into the horseback riding exercise and control group (n = 10 each). [Methods] The exercise was performed for 15 minutes, 3 times per week(More)
As the system is deployed in the dynamic environments, the need of self-adaptive system is increasing. In addition, by advancing the network technology, self-adaptive system interacts with other systems to achieve the complex goals, which are difficult to be achieved by single self-adaptive system. During the interaction, they may share security-critical(More)
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