• Journal of Satellite, Information and Communications
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• v.9 no.4
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• pp.111-116
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• 2014

Thanks to diffusions of mobile devices and advances of network technologies, demands for mobile app have been increased dramatically. It has resulted in mobile app industries as well as mobile app authoring tools are facing a crisis over subordinate to specific OS and platform such as iOS, Android and Apple App Store. Because these particular OS and platforms are obstacles to overcome for supporting interoperability and compatibility. In this study, we have conducted expert interviews and surveys to analyze status of mobile app markets and needs for mobile app user and developer. As a result, mobile app based on HTML5 leads to interconnect various mobile devises without additional efforts. Thereby, mobile app user and developer take a positive view of HTML5. However, mobile app developers tend to have the technical path dependence, they especially in venture and small enterprises need to government support for professional manpower training.

• Journal of Technology Innovation
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• v.28 no.1
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• pp.1-30
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• 2020

The government has implemented policies to increase university technology commercialization while supporting university research over time. This paper adopts the neo-institutional theory and examines the effect of change in the government research funds that universities have received overtime on the change in their technology commercialization performance. It also investigates a location (Seoul metro or others) effect on the relationships. Using latent growth curve modeling (LGM), which is widely used for time-varying analysis, this study longitudinally analyzes 138 universities in South Korea over the past nine years from 2009 to 2017. The results indicate that the growth in the annual government research funds that universities attain affects the growth in the economic value of technology transfers. In addition, the relationship is stronger for universities in Seoul metropolitan areas than those in other areas. The relationships are intact with one-year lagging effects. The findings help understand the effectiveness of government R&D policies for promoting technology commercialization.

• Journal of the Korea Society of Computer and Information
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• v.17 no.2
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• pp.13-21
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• 2012

Mobile data caching is usually used as an effective way to improve the speed of local transaction processing and reduce server load. In mobile database environment, due to its characters - low bandwidth, excessive latency and intermittent network, caching is especially crucial. A lot of mobile data caching strategies have been proposed to handle these problems over the last few years. However, with smart phone widely application these approaches cannot support vast data requirements efficiently. In this paper, to make full use of cache data, lower wireless transmission quantity and raise transaction success rate, we design a new mobile data caching synchronization strategy based on in-demand and replacement priority. We experimentally verify that our techniques significantly reduce quantity of wireless transmission and improve transaction success rate, especially when mobile client request a large amount of data.

• Journal of the Korea Society of Computer and Information
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• v.15 no.9
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• pp.99-107
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• 2010

This paper showed that the integrated system to fortify security was much more efficient than the respective system through the analysis of problems from Firewall and IPS system in the existing security systems. The results of problem analysis revealed that there were the delay of processing time and lack of efficiency in the existing security systems. Accordingly, their performance was evaluated by using the separated Firewall, IPS system, and the integrated system. The result of evaluation shows that the integrated security system this paper suggested is five times faster than the existing one in terms of processing speed of response. This paper demonstrated the excellence of the proposed security system is also more than fivefold in session handling per second and six times process speeding in the CPU processing performance. In addition, several security policies are applied, and it provided a fact that it gave an excellent performance when it comes to protecting from harmful traffic attacks. In conclusion, this paper emphasized that fortifying the integrated security system was more efficient than fortifying the existing one considering in various respects such as cost, management, time, space and so on.

• Journal of the Korea Fashion and Costume Design Association
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• v.20 no.4
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• pp.147-162
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• 2018

The purpose of this study is to conduct a comprehensive and objective evaluation on the effectiveness of the activation policies for the Seongsu handmade shoe industry and to suggest the direction of more effective future policies using the results. The list of the activation policies for the Seongsu handmade shoe industry was investigated and awareness, appropriateness, effectiveness, and satisfaction were measured from the representatives of the Seongsu handmade shoe companies via an off-line survey. A total of 61 usable data sets were statistically analyzed. Based on the evaluation result of the policies, a focus group interview with 6 representatives of the Seoungsu handmade shoe industry was conducted to investigate the causes and effectiveness of the policies and the problems pertaining to those policies. The awareness, effectiveness, and satisfaction of the policies were evaluated as negatives, while the appropriateness of the policies was evaluated as a positive. The manufacturers of the handmade shoes evaluated policies that improve the environment of the workplace higher and evaluated the handmade shoes education policy lower than the distributors and raw materials suppliers. The problems with the activation policies for the Seongsu handmade shoes industry were found to be structural problems, issues with the implementation of the policies, and that the fact that the policies did not reflect the reality of the industry.

• Journal of Digital Convergence
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• v.17 no.8
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• pp.221-228
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• 2019

The importance of security for virtualization products has been increased with the activation policy of cloud computing and it is necessary to analyze cyber security threats and develop security requirements for virtualization products to provide with more secure cloud environments. This paper is a preliminary study with the purpose of developing security functional requirements through analyzing security features and cyber security threats as well as comparison of foreign countries' cases for virtualization products. To do this, the paper compares evaluation schemes for virtualization products in US and UK foreign countries, and analyzes the cyber security threats, security objectives and security requirements in both countries. Furthermore, it proposes the essential checking items and processes for developing security functional requirements about security features of virtualization products to contribute to its more secure development and the establishment of related security evaluation standards.

• Journal of Digital Convergence
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• v.17 no.8
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• pp.337-346
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• 2019

This study aimed to assess trends in the prevalence, treatment, and control of diabetes according to the socio-economic level in Korean adults aged ${\geq}30$ years, using the 2007-2017 Korea National Health and Nutrition Examination Survey data. Socio-economic status was assessed based on the household income. Multivariable logistic regression and predictive margins were used to evaluate the adjusted proportion of diabetes prevalence, awareness, treatment, and adequate glycemic control. During 2007-2017, the socio-economic inequalities on diabetes prevalence were observed in both men and women. However, the gradient of inequality increased only in men (p for interaction=0.034). Diabetes awareness, treatment, and control did not show socio-economic inequalities or increasing gradients in both sexes. Monitoring of these trends should be continued, and further research on effective interventions is needed.

• The Journal of the Korea Contents Association
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• v.21 no.6
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• pp.306-317
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• 2021

With a global shift from carbon economy towards hydrogen economy, leading countries such as the U.S., Europe, China, and Japan are focusing their research capabilities on hydrogen research and development(R&D) by announcing various hydrogen economy policies. South Korea also has been following this global trend by announcing hydrogen economy roadmap in January 2019 and legislating hydrogen economy related law. In this paper, we tried to figure out the national R&D trend of Fuel Cell Electric Vehicle(FCEV) and its knowledge structure by using recent 10-year project data of National Technology and Information Service(NTIS). We collected 1,479 FCEV-related projects and conducted text mining and network analysis. According to the analysis, FCEV-related R&D has been actively carried out over the entire process of hydrogen production, transport, storage, and utilization. Furthermore, the paper provides insights into the government's policy agenda building and market strategy on the hydrogen economy.

• Journal of Digital Policy
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• v.1 no.2
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• pp.1-8
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• 2022

In case of a dangerous situation, the roof, which serves as an emergency exit, must be open in case of fire according to the Fire Act. However, when the roof door is opened, it has become a place of various incidents and accidents such as illegal entry, crime, and suicide. As a result, it is a reality to close the roof door in terms of facility management to prevent crime, various incidents, and accidents. Accordingly, the government is pushing to legislate regulations on housing construction standards, etc. that mandate the installation of electronic automatic opening and closing devices on rooftop doors. Therefore, in this paper, an intelligent emergency door opening/closing device system is proposed. To this end, an intelligent emergency door opening and closing system was developed by linking wired and wireless access counting and AI image analysis. Finally, it is possible to build a wireless communication-based integrated management platform that provides remote control and history management in a centralized method of device status real-time monitoring and event alarm.

• Environmental and Resource Economics Review
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• v.31 no.3
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• pp.393-417
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• 2022

Using hourly SMP data from 2016 to 2020, this paper measures the weekly realized volatility and investigates the main force of its determinants. To this end, we extend the Bayesian variable selection by incorporating the regime-switching model which identifies important variables among a large number of predictors by regimes. We find that the increase in coal and nuclear generation, as well as solar power, reinforce the SMP volatility in both high volatility and low volatility regime. In contrast the increase in gas generation and gas price decrease SMP volatility when SMP volatility is high. These results suggest that the expansion of renewable energy according to 2050 Carbon Neutrality or energy transition policies increases SMP volatility but the increase in the gas generation or reduction of coal generation might offset its impact.