• Korean Journal of Environmental Agriculture
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• 제34권3호
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• pp.168-177
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• 2015

BACKGROUND: In recent year, there has been great concern regarding agricultural land uses and their importance for the conservation of biodiversity. Rice fields are managed unique wetland for wildlife, especially waterbirds. A comprehensive monitoring of the waterbird assemblage to understand patterning changes was attempted for rice ecosystem in South Korea. This rice ecosystem has been recognized as one of the most important for waterbirds conservation. METHODS AND RESULTS: Biweekly monitoring was implemented for the 4 years from April 2009 to March 2010, from April 2011 to March 2014. 32 species of waterbirds were observed. Self-organizing map (SOM) and random forest were applied to the waterbirds dataset to identify the characteristics in waterbirds distribution. SOM and random forest analysis clearly classified into four clusters and extract ecological information from waterbird dataset. Waterbird assemblages represented strong seasonality and habitat use according to waterbird group such as shorebirds, herons and waterfowl. CONCLUSION: Our results showed that the combination of SOM and random forest analysis could be useful for ecosystem assessment and management. Furthermore, we strongly suggested that a strict management strategy for the rice fields to conserve the waterbirds. The strategy could be seasonally and species specific.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 한국해양정보통신학회 2010년도 춘계학술대회
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• pp.422-424
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• 2010

Recently the car attached many ECUs and entertainment devices to provide the easiness maintenance and driver's convenience. CAN and MOST networks have been used to manage and control those devices in the car. Wireless network also has been established to receive information from external. These days a car navigation system with GPS is being integrated with CAN, MOST and Wireless network. In these circumstances, the car navigation system can have HMI function to integrate and control the car networks' devices. To solve the GPS problems such as positioning errors or losing signals from satellites in the tunnels and urban canyons, this paper designs and implements a method for positioning vehicle by using the sensing data of sensors and Wi-Fi devices based on this integrated environment.

• Journal of the Korea Academia-Industrial cooperation Society
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• 제16권2호
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• pp.1045-1053
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• 2015

In this research, we conducted meta analysis of the cases of "burnout" of social workers from the 1990s to 2013. The result of analysis shows that the factors that cause burnout of social workers include work experience, compensation from work environment, supervision, promotion, work freedom-related factors and client-related factors such as the seriousness of client problems, the appropriateness of client counts, and all factors excluding client-related factors showed signficaint correlatoins. Moreover, the higher the age and the length of work experience, the lower the sense of self-wroth and emotional intelligence; the higher the social support, the lower the possibility of burn out. The research results suggest need for programs to prevent burn out of social service providers both in environment internal and external to organizatoins.

• Land and Housing Review
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• 제4권3호
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• pp.243-258
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• 2013

This study aims to introduce "Street-Housing" Redevelopment Projects adopted by the revision of regulations in 2012 and promote them by surveying residents' needs. The objectives of the street-housing redevelopment projects are to maintain existing street systems and redevelop housing by small units, as an alternative to the large-scale housing redevelopment by the expropriation. Residents, however, do not seem to support the new projects since they are satisfied with their current housing, have difficulty in raising funds, and are uncertain about proceeding with the pre-arranged. Despite these barriers, residents may support the projects if project charges can be lowered by the reduction in each resident's share and the increase in supporting funds. This study proposes new practical methods for realizing the projects: choice of an appropriate site, engaging for resident's participation in projects, reduction in project charges, and removal of barriers to co-operative development. etc.

• Journal of Convergence for Information Technology
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• 제8권4호
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• pp.27-35
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• 2018

This study aimed to analyze the association among dental care consumers' responses to waiting time, hospital image, and patient satisfaction and provide basic data that could help qualitative waiting conditions management related to health care service. A survey was conducted from May 18 to June 20, 2016 in adults who had spent waiting time at dental hospitals or clinics, and the following conclusion was drawn: Hospital image was associated with the changes in reliance on dental care centers in case of long wait, the changes in reuse intentions, and the reservation system, and patient satisfaction was associated with gender, explanation of expected waiting time, the changes in reliance on dental care centers in case of long wait, the changes in reuse intentions, and the reservation system. The positive responses to waiting time was positively correlated with hospital image and patient satisfaction; the negative reaction to waiting time was negatively correlated with hospital image and patient satisfaction; and hospital image was positively correlated with patient satisfaction.

• The Journal of Korean Association of Computer Education
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• 제22권2호
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• pp.51-66
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• 2019

The Korean ministry of education has adopted an educational policy about digital textbooks at K-12 schools since 2018, in order to provide students with individualized learning contents and activities. However, digital textbooks has been yet prepared and delivered for the students with disabilities in the inclusive education. This study aims to develop the guidelines on digital textbooks for students with disabilities applying universal design for learning, recognizing the requirements for the digital textbooks which can be utilized in the K-12 inclusive classrooms for diverse students. In this respect, guidelines on digital textbooks were developed based on previous studies and cases. The first draft of guidelines were reviewed with two rounds of the delphi methods with special teachers. In addition, scenarios were developed, representing the rich educational contexts with digital textbooks applying the guidelines in a practical way for students with 4 types of disabilities. This study can contribute to establishing educational policies and environments related to the digital textbook development and dissemination for students with disabilities.

• The Journal of Korean Institute of Information Technology
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• 제17권4호
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• pp.109-117
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• 2019

In modern society, due to various accidents and crime threats committed to an unspecified number of people, individual security awareness is increasing throughout society and various surveillance techniques are being actively studied. Still, there is a decline in robustness due to many problems, requiring higher reliability monitoring techniques. Thus, this paper suggests a real-time change detection technique to complement the low robustness problem in various environments and dynamic/static change detection and to solve the cost efficiency problem. We used the Self-Organizing Map (SOM) applied as a data clustering technique to implement change detection, and we were able to confirm the superiority of noise robustness and abnormal detection judgment compared to the detection technique applied to the existing image surveillance system through simulation in the indoor office environment.

• Journal of the Korean Society of Marine Environment & Safety
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• 제26권7호
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• pp.838-844
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• 2020

The purpose of this study is to examine whether personality and reward affect PSM of new maritime police officer recruits. Results are as follows. First, among the personality factors, the neuroticism sub-factor had significant positive effect on PSM sub-factors favorable perception towards public policy, commitment to public interest, and empathy. Also, the extroversion sub-factor had significant effect only on the self-sacrifice sub-factor of PSM. Second, the reward factor mostly didn't have significant effect on PSM. The internal reward sub-factor had significant effect on the empathy sub-factor of PSM. These results confirm that personality factors have significant impact on public service motivation. This implicates the need for policy improvements to reflect this result, and further empirical studies on the relationship between reward and public service motivation.

• Journal of the Korean Recycled Construction Resources Institute
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• 제10권3호
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• pp.235-242
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• 2022

The percolation threshold of the CNT-reinforced cement paste is closely related to the optimal CNT amount to maximize the sensing ability of self-sensing concrete. However, the percolation threshold has various values depending on the cement, CNT, and water-to-cement ratio used. In this study, a percolation simulation model was proposed to predict the percolation threshold of the CNT-reinforced cement paste. The proposed model can simulate the percolation according to the amount of CNT using only the properties of CNT and cement, and for this, the concept of the number of aggregated CNT particles was used. The percolation simulation consists of forming a pre-hydrated cement paste model, random dispersion of CNTs, and percolation investigation. The simulation used CNT-reinforced cement paste with a water-cement ratio of 0.4 to 0.6, and the simulated percolation threshold point showed high accuracy with a simulation residual ratio of up to 7.5 % compared to the literature results.

• The Journal of the Korea institute of electronic communication sciences
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• 제17권5호
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• pp.745-758
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• 2022

As the unlimited natural source of a country, radio waves are widely being used in the daily life toward knowledge based information society. Therefore it is necessary to provide a long term policy of radio waves management policies based on market situation to cope with rapidly changing wireless technology and effective use of radio resources. Literary survey and analysis were accomplished for the rules and regulations in the radio station approval system and post-approval policies for mobile communication service. In conclusion, this study propose an blanket radio approval policy as well as self declaration of conformity(SDoC) of radio waves technical regulation and advanced radio inspection procedure. This study has significance in providing reference for introducing deregulation policy in the radio communication imdustry.