• Journal of KIISE:Information Networking
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• v.36 no.6
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• pp.514-527
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• 2009

Wireless sensor networks (WSNs) can be used in various applications for military or environmental purpose. Recently, there are lots of on-going researches for detecting and tracking the spread of continuous objects or phenomena such as poisonous gas, wildfires, earthquakes, and so on. Some previous work has proposed techniques to detect edge nodes of such a continuous object based on the information of all the 1-hop neighbor nodes. In those techniques, however, a number of nodes are redundantly selected as edge nodes, and thus, the boundary of the continuous object cannot be presented accurately. In this paper, we propose a new edge detection method in which edge nodes of the continuous object are detected based on the information of the neighbor nodes obtained via the Localized Delaunay Triangulation so that a minimum number of nodes are selected as edge nodes. We also define the sensor behavior rule for tracking continuous objects energy-efficiently. Our simulation results show that the proposed edge detection method provides enhanced performance compared with previous 1-hop neighbor node based methods. On the average, the accuracy is improved by 29.95% while the number of edge nodes, the amount of communication messages and energy consumption are reduced by 54.43%, 79.36% and 72.34%, respectively. Moreover, the number of edge nodes decreases by 48.38% on the average in our field test with MICAz motes.

• Cartoon and Animation Studies
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• s.50
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• pp.131-151
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• 2018

Notwithstanding various discourses among scholars on the unique characteristics of comics, in Korea there is nevertheless a scarcity of quality research on the subject. Therefore, to promote quality research, it is important to consider how to best use source materials in the field of comics scholarship. Source materials can generally be categorized into three types: pre-existing comics, scholar-generated comics and user-generated comics. For this study, user-generated comics are the primary source materials, specifically comics created by mothers of children with disabilities. It is intended that this research will contribute to the future direction of education for mothers who suffer from a relative sense of alienation as the primary caregivers of children with special needs. Although therapeutic arts and cultural programs make a tremendous difference in the lives of these mothers, teaching methodology and educational opportunities are extremely limited. Furthermore, existing scholarship focuses primarily on either the psychological transformation of the individual or a phenomenological approach for parents to understand and deal with the problematic behavior of children with disabilities. However, this research does little to help improve learning programs for these parents. Against this backdrop, this research sets out to consider the potentiality and effectiveness of using comics in the education of mothers of children with disabilities. These mothers, by creating comics, develop better awareness of themselves in a positive and enriching way. It is therefore hoped that this research provides a useful analysis for developing the potentiality and effectiveness of these programs.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.4
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• pp.254-264
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• 2018

The study aims were to verify the influences of job environment factors and work attitude on turnover intention of school foodservice employees, and then to verify the mediating effect of organization commitment between six areas of worklife and turnover intention so that organizations can intervene to reduce the turnover intentions of employees. The subjects were 205 employees who were working in the school foodservice field. The job environment factors were measured by six areas of worklife (workload, control, reward, fairness, community, value) and the organizational commitment was measured by two types of commitments (affective, continuance). The results were as follows. First, workload, reward, community and value of six areas of worklife reduced affective commitment, control and fairness increased continuance commitment, and affective commitment reduced turnover intention. Second, only reward and community showed direct effect on turnover intention, but all six areas of worklife had a statistically significant indirect effect on turnover intention through affective commitment. These results showed that job environment factors had both direct and indirect effect on employees' behavior through employees' affection. These findings imply that organizations can control employees' turnover intention by providing education or social support to maintain their affective commitment even when organizations cannot change job environment.

• Journal of Sasang Constitutional Medicine
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• v.12 no.1
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• pp.63-83
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• 2000

The common concerns of leadership approaches were focused on finding leadership factors or necessity of leadership change to proper leadership styles adapt to contingent change through observing various leaders' behaviors for improving organizational effectiveness. Basically, they assumed that the human could be adapt to any conditions regardless of his inherent characters though it is perceived generally that human beings have different attitudes and behaviors toward the same fact, condition, situation, etc. In other words, inherent factors that cause individual differences have been neglected but concerned only about postnatal environments which influence human characters in previous leadership studies. A number of studies concerning inherent human characters have been worked in Asia for the past thousands years, which enable answering to the questions; why the human beings have different characters and personalities, and how to manage them in the given life conditions. In this research, four type human theory(called Sasang Theory) which has already been widely used in medical field in Korea will be introduced and applied to leadership theory to indicate inherent causal factors of the human character that are expected to influence leadership styles. In process, two different methods, one is for leadership theory and the other is for Sasang theory, have to be considered to match the different ideas. The theory is so predictable that the result implies possibilities of further future researches in the organizational fields by presupposing human behavior.

• Journal of Korean Society on Water Environment
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• v.32 no.1
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• pp.36-45
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• 2016

Sand filters are widely used in infiltration systems to manage polluted urban runoff. Clogging, which is mainly caused by the deposition of sediments on the filter media, reduces the filter system's infiltration capacity, which further limits its lifespan and function. The physical, chemical and biological clogging characteristics of sand filter, therefore, need to be known for effective design and maintenance. Physical clogging behavior and variations in the characteristics of sand filters according to different media depths are examined in this paper. The variations were observed from laboratory column infiltration tests conducted in a vertical flow and fluctuating head condition. It can be seen that an increase in filter media depth results in a high sediment removal performance; however, it leads to a shorter lifespan due to clogging. In the choice of filter media depth to be used in field applications, therefore, the purpose of facilities as well as maintenance costs need to be considered. At all filter media depth configurations, premature clogging occurred because sediments of 100~250 μm clogged the top 15% of filter media depth. Thus, scrapping the top 15% of filter media may be suggested as the first operational maintenance process for the infiltration system.

• Journal of Korea Water Resources Association
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• v.42 no.10
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• pp.891-896
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• 2009

The puff models have been developed to simulate the advection-diffusion processes of dredging suspended solids, either alone or in combination with Eulerian models. Computational efficiency and accuracy are of prime importance in designing these hybrid approaches to simulate a pollutant discharge, and we characterize two relatively simple Lagrangian techniques in this regard: forward Gaussian puff tracking (FGPT), and backward Gaussian puff tracking (BGPT). FGPT and BGPT offer dramatic savings in computational expense, but their applicability is limited by accuracy concerns in the presence of spatially variable flow or diffusivity fields or complex no-flux or open boundary conditions. For long simulations, particle and/or puff methods can transition to an Eulerian model if appropriate, since the relative computational expense of Lagrangian methods increases with time for continuous sources. Although we focus on simple Lagrangian models that are not suitable to all environmental applications, many of the implementation and computational efficiency concerns outlined herein would also be relevant to using higher order particle and puff methods to extend the near field.

• Journal of the Korean Society of School Health
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• v.11 no.1
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• pp.27-50
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• 1998

Adolescent health is considered to contribute to health promotion in the home and community in the near future as well as individual health. However, adolescent health has been neglected from education field because of competitive school education focused on the university entrance examination That's why I suggest in this study that we should pay much more attention to adolescent health condition and try to make It better, in terms of man-power development and life-health promotion for nation development The purposes of this study are as follows First, to look into a variety of adolescent health problems Second, to find out the situation and problems of current adolescent health promotion and school health education Third, to make an effort to find, based on the current situation, various developments of adolescent health promotion and school health education in terms of practical, political and environmental change There are used study methods as adolescent-related, school heath-related literature review and anlysis of statistical data The results and suggestions are as follows Teenagers have a great variey of health problems including most Important physical, mental and social developments Recently, chronic diseases, emotional problems, health-risk behaviors linked With adolescents are on increase The complicated disorders of physical, mental, social health rather than paricular aspects of health or health-behavior problems influence adolescent health problems adolescence is regarded as the period when most health-related behaviors are formed. Therefore, adolescent health promotion would he assured by developing the ability of controlling multi-dimensional health determinants in the early stage. Health promotion is a positive concept that each individual, family and community makes real efforts to improve their health To achive this, we need health educational, organizational, political and environmental supports. Adolescent health promotion in Korea has been systematically treated in the category of school health Current school health services have had lots of systemic, constitutional, administrative and educational flaws Accordingly, I'm concerned that we can afford to accept a variety of adolescent health needs However, I would say that if were not to make those flaws better, it's certain that Korean national competitive power and the quality of the lives of most Koreans Will he threatened someday We have to develop Comprehensive School Health Crriculum(CSHC) and set up its standards to Improve adolescent health. CSHC is an organizational and costant process. CSHC means an Important part of overall curriculums. In addition, I could say that it's an Important school health education acivity including current school health services-health care service and school health environment. In conclusion, in order to develop CSHC, we require school nurse's role changes, establishment and management of intergrated subject of health education, striking revision of school health law(or legislation of school health promotion law), reorganization of administration system, big changes in curriculum for school health educators.

• Journal of Korean Society of Transportation
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• v.21 no.5
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• pp.97-110
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• 2003

The sight distance at unsignalized intersections is the one of the fundamental geometric design elements, and can ensure safety and efficient operations. Despite its importance, little research attention has been directed in Korea compared to developed countries such as European countries, the United States, and Japan. AASHTO ISD policies have been applied to the intersection design in Korea without any revise, which can produce unrealistic and unadoptable design values. Those values are emerged from several reasons because the AASHTO ISD has been calibrated based on the local data. Therefore the ISD hardly takes into account the local characteristics of Korea such as driving behavior. vehicular movement and roadway conditions. The objective of this study is to calculate the appropriate ISD values for unsignalized intersections in the urban area in Korea. In this study, we employed the ISD model of AASHTO(2001), which is based on gap acceptance theory and can account for and take the driving and roadway conditions in Korea into consideration. The approach can also consider the complex driving maneuvers at the intersections in a proper and simple manner. The results in this study show that the ISD design criteria currently used in Korea are more conservative(safer) than those of the USA. In other words, the ISD using field data collected in this study has generally smaller values than those in USA.

• The Journal of the Korea Contents Association
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• v.8 no.4
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• pp.237-246
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• 2008

The purpose of this study was to develop relaxation training contents for middle and high school archery players with considering the ecological validity of social, cultural, and sports environment in Korean but also examine the effect of developing relaxation training contents through case study approach and interviews. The relaxation training contents was based on previous researches about relaxation program. In addition, in order to develop the program 3 archery experts and 2 sport psychologists had meetings. The relaxation training contents categorized as orientation, breathing regulation, progressive relaxation training, cognitive restructuring, meditation, heart rate biofeedback training, autogenic training, behavior therapy, self regulation. The experimental group were 6 male Korean national archery substitute players, who were selected in 2007. The effects was examined on competitive state anxiety inventory-2, heart rates, archery score and interviews. As the result of applying the developed program of this study on the field, competitive state anxiety, somatic state anxiety and heart rate were decreased. In the interviews athletes told that they were relaxed psychologically and physically. This result demonstrated the relaxation training program were effective.

• Journal of the Korean Magnetics Society
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• v.10 no.3
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• pp.133-138
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• 2000

We have investigated some crystallographic, magnetic, and transport properties of the first colossal magnetoresistive compounds $La_{1-x}Ba_{x}MnO_3(0\leq\chi\leq$1)$(5\;K\leqT\leq360K,-5T\leqH\leq5T$ and resistivity $(100K\leqT\leq350K$measurements. $La_{1-x}Ba_{x}MnO_3$ were found to be ferromagnetic for all x.The $La_{1-x}Ba_{x}MnO_3$were found to be insulating for x< 0.2, metallic for 0.20.5. The magnitude of saturation magnetization (Ms) increased until x=1/8 and had theoretical maximum Ms for 0.13$\sfrac{3}{8}$ and had a constant value of 335~340 K for x>$\sfrac{3}{8}$. For $x\geq0.5$ the $La_{1-x}Ba_{x}MnO_3$ samples showed a percolation-type conduction behavior and enhanced low field magnetoresistance caused by simultaneous occurrence of the chemical/magnetic phase separation.