• Industry Promotion Research
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• v.5 no.1
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• pp.53-62
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• 2020

This study reviewed the structural and operational systems of two professional learning communities in Korean society and analyzed their strengths and weaknesses: the Association of Korean History Teachers and the Communities of Elementary School Classroom Management. In order to analyze these cases, Robey's organizational change model was used as a theoretical frame. Two research methods were mainly employed for this study: literature review and on-site interviews. The analysis found several strengths (easy accessibility, led by teachers' initiative and autonomous will, abundant and practical teaching solutions) and weaknesses (financial burden, lack of theoretical background, sporadic participants). In conclusion, this study suggests three strategies for an educational leader who has an important role in developing a teacher's professionalism: 1) Make an institutional effort to stimulate teachers' motivation to learn, 2) Create a strong network of university professors and other experts for career advice, 3) Build a synthesized and consolidated system.

• Journal of the Korea Society of Computer and Information
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• v.16 no.4
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• pp.101-110
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• 2011

A smart grid networks delivers electricity from suppliers to consumers using digital technology with two-way communications to control appliances at consumers' homes to save energy, reduce cost and increase reliability and transparency. Security is critically important for smart grid networks that are usually used for the electric power network and IT environments that are opened to attacks, such as, eavesdroping, replay attacks of abnormal messages, forgery of the messages to name a few. ZigBee has emerged as a strong contender for smart grid networks. ZigBee is used for low data rate and low power wireless network applications. To deploy smart grid networks, the collected information requires protection from an adversary over the network in many cases. The security mechanism should be provided for collecting the information over the network. However, the ZigBee protocol has some security weaknesses. In this paper, these weaknesses are discussed and a method to improve security aspect of the ZigBee protocol is presented along with a comparison of the message complexity of the proposed security protocol with that of the current ZigBee protocol.

• Korean journal of communication and information
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• v.23
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• pp.7-45
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• 2003

As e-commerce has led to profound changes in the way economic transactions are made and has spurred the rapid integration of global markets, governance of e-commerce has emerged as an important policy agenda around the globe. Given the broader social and economic implications of e-commerce, it is of no surprise that the rule-making process for global e-commerce has increasingly captured the attention of scholars. Despite the substantial contributions to understanding this process, a review of the literature reveals some weaknesses in the study of emerging forms of governance in global e-commerce. This paper addresses these weaknesses and proposes an alternative theoretical framework that underscores the role of ideas and discourse in the global rule-making process.

• Journal of the Korean Wood Science and Technology
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• v.27 no.1
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• pp.64-71
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• 1999

This study was conducted to manufacture MDF panels bonded with PF resins which provide excellent durability and dimensional stability with panels, and to identify benefits and weaknesses of using PF resins for MDF panels that have been manufactured with urea-formaldehyde (UF) resins for interior applications due to its low dimensional stability under moisture conditions. The results showed that the performance of PF-bonded MDF panels satisfied the performance requirement. A six-cycle aging test also revealed that PF-bonded MDF panels had high durability. Thickness swelling after 24 hours submersion in cold water was less than 2 percent, showing good dimentioanl stability. The identified weaknesses of using PF resins were relatively high resin content and long hot-pressing time. An acceptable resin content appeared to be 8 percent which can increase the production cost of PF-bonded MDF panels. The hot-pressing time (7 minutes) used in this study is relatively long compared to that of UF-bonded MDF panels. This result also indicates that hot-pressing process has to be optimized to control various pressing variables.

• Journal of KIISE:Information Networking
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• v.32 no.3
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• pp.327-338
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• 2005

Since the IEEE 802.11 wireless LANs were known to have several critical weaknesses in the aspect of security, a lot of works have been done to reduce such weaknesses of the wireless LAN security, Among them IEEE 802.lli may be the ultimate long-term solution that requires new security platform with new wireless LAM products. However, it might not be the best solution for small organizations due to its high cost where the cost is a critical issue. This paper proposes FR-WEP, a light-weight key management for wireless LANs that can be used with small changes of the existing Products. FR-WEP is an extension to a lightweight key management, WEP'(9), which was proposed lately. It makes up for the weak points of WEP' by providing lightweight mutual authentication with both host keys and user keys, and seamless key-refresh for authenticated users with fast re-authentication. It would be a good alternative to the heavy standards for wireless LAN security, especially to small organizations hoping for better security.

• Journal of Broadcast Engineering
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• v.20 no.4
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• pp.598-605
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• 2015

Effective alerts will drastically mitigate the disaster impacts. One way to enhance the effectiveness is to prepare multiple alert distribution channels. In this paper, we propose a new emergency alert distribution system that will solve the weaknesses of the current distribution systems, such as Cell Broadcasting System and T-DMB Automatic Emergency Alert Service. The weaknesses are: the limitation of message length, small portions of terminals that can receive and display the alert signal, and one-way communication service. To solve these problems, we propose an emergency alert distribution system over the Internet with RSS (Rich Site Summary) format. The system also has the capability of adaptive alert filtering according to the receiver characteristics. We analyzed the characteristics of RSS as an alerting format, and draw functional requirements satisfying use case scenarios. We designed the system only with major requirements and verified it on our test bed. Sending richer message contents through various receiving terminals, the system will achieve more effective emergency alert service.

• Journal of the Korean Magnetics Society
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• v.24 no.6
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• pp.171-178
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• 2014

Remote Field Eddy Current Testing (RFECT), one of the ways which is a nondestructive testing using electromagnetic fields, can make up for Magnetic Flux Leakage (MFL) weaknesses and general Eddy Current Testing (ECT) weaknesses which is an occurrence of a huge friction force or disadvantage of detecting defects on the outer wall. So many of institutes and laboratories have studied on RFECT for the past 50 years. But There is a lack of discussion about a study on eddy current and magnetic field distributions in a pipe wall and designing of RFECT exciter coil. In this paper, eddy current and magnetic field distributions in a pipe wall and influence of altering variables are analyzed. Also, the optimal design algorithm about the RFECT Exciter coil are proposed, and influence on defect signals caused by alteration of its shape is analyzed.

• East Asian Journal of Business Economics (EAJBE)
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• v.8 no.3
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• pp.1-13
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• 2020

Purpose - Identify the priorities of important factors through SWOT/AHP analysis method for vitalization of global marine sports in Korea. Through this, we will identify prerequisites and strategies for Korean marine sports to become a global powerhouse, including revitalizing the Korean Wave for Chinese consumers. It also revitalizes global competitiveness and draws policy implications. Research design and methodology - Through interviews with experts and literature data, elements of important opportunities, threats, strengths and weaknesses of marine sports are summarized. Based on this SWOT, the AHP technique is applied to determine which is first and what is important between the factors that save opportunities and increase strengths, and measures to cope with threats and factors that complement weaknesses. Through this, the priority factor of experts suggests a plan for activating strategic marine sports. Results - First, the current status of marine sports in Korea and the perception of consumers are grasped through current data and literature research. Sub-elements are derived based on the theoretical literature on SWOT elements and opinions of experts. Prioritization is identified based on the AHP questionnaire of Korean experts. Conclusions - The strategy was derived through SWOT/AHP analysis, and the following implications were obtained. Regionally, Busan is psychologically and geographically adjacent to China and Japan. It is also an area where human exchanges are actively taking place along with the volume of imports and exports. Due to the increase in China's marine sports industry and population, it is necessary to expand the scope of Korea to marine sports beyond cosmetics, dramas, movies, and Korean waves (Hallyu) stars.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.46 no.2
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• pp.73-80
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• 2009

Security is critically important for ubiquitous sensor networks that are usually used for the military and serveillance in environments that are opened to attacks, such as, eavesdroping, replay attacks of abnormal messages, forgery of the messages to name a few. ZigBee has emerged as a strong contender for ubiquitous sensor networks. ZigBee is used for low data rate and low power wireless sensor network applications. To deploy ubiquitous sensor networks, the collected information requires protection from an adversary over the network in many cases. The security mechanism should be provided for collecting the information over the network. However, the ZigBee protocol has some security weaknesses. In this paper, these weaknesses are discussed and a method to improve security aspect of the ZigBee protocol is presented along with a comparison of the message complexity of the proposed security protocol with that of the current ZigBee protocol.

• Spatial Information Research
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• v.22 no.3
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• pp.59-69
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• 2014

Korea's spatial information companies have been supported by the government due to overcome the weak global competitiveness. This research examines possible causality between the request from the company and the policy support by the government. Structural equation model is used to analyze the recognized competitiveness and the supporting policy. The analysis result shows no statistically significant causality between the company's request and government's support. In other words, the current policies including subsidies, tax incentives, national certificates, and information channels do not impact the global competitiveness of a spatial information company. This research concludes that it is necessity to identify actual weaknesses of the company and to review the efficiency of the supporting policies to overcome those identified weaknesses.