• IEMEK Journal of Embedded Systems and Applications
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• v.9 no.1
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• pp.25-32
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• 2014

In this paper, we proposed a partial-way set associative cache memory with an effective memory access time and low energy consumption. In the proposed set-associative cache memory, it is allowed to access only a 2-ways among 4-way at a time. Choosing ways to be accessed is made dynamically via the least significant two bits of the tag. The chosen 2 ways are sequentially accessed by the way selection bits that indicate the most recently referred way. Therefore, each entry in the way has an additional bit, that is, the way selection bit. In addition, instead of the 4-way LRU or FIFO algorithm, we can utilize a simple 2-way replacement policy. Simulation results show that the energy*delay product can be reduced by about 78%, 14%, 39%, and 15% compared with a 4-way set associative cache, a sequential-way cache, a way-tracking cache, and a way cache respectively.

• East Asian Economic Review
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• v.20 no.3
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• pp.311-338
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• 2016

In the race for establishing trading architecture consistent with new landscape of the global economy, the US is ahead of the game by concluding the Trans Pacific Partnership Agreement with 11 countries. To make it reality, the ratification is essential. In the battle for ratification in the US, declining globalism confronts rising protectionism. This paper models the ratification process as contest between globalism and protectionism, and analyzes the optimal timing for ratification. Based on this framework, various ratification scenarios are analyzed. The paper argues less likelihood for the lame-duck session passage and more likelihood for prolonged and protracted delay, due to changing political dynamics and declining intellectual support for globalism. Hence, the future of Trans Pacific Partnership Agreement may prove different, compared to the North American Free Trade Agreement and the Korea-US Free Trade Agreement, both of which were renegotiated and ratified eventually. Then, the US would lose the first move advantage. The paper also discusses strategic implications of delayed ratification on the evolution of trading architecture in East Asia.

• International Commerce and Information Review
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• v.10 no.1
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• pp.375-393
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• 2008

The purpose of this study is to investigate the Chinese investment environment and analyze the actual investment condition of Korean enterprises in China and examine the points at issue. In general, the investment environment in China shows satisfactory progress. China has a multiple and regional extension policy in investment. And the environment for investment changes to insufficiency of company profit, extension of service market, maintenance of legislative system, and insufficiency of preference about foreign company. There are situations of inclining to manufacturing, inclining of region, preference of independence investment, small-sized investment by small and medium enterprises, difficulty of financial assistance, excess of logistic cost, delay of logistic term, difficulty of settlement of legal dispute and difficulty of taking a relative information in investment of Korean enterprise in China. The results of the study indicate mostly that the investment of Korean enterprise into China needs turnover of service trade-tertiary industry, portfolio of investment territory, cooperation with Chinese enterprise through joint venture investment and a large-scale investment for extension of Chinese domestic market.

• Korean Journal of Clinical Laboratory Science
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• v.41 no.3
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• pp.128-134
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• 2009

This study examined people over 60 years old living in Gumi, Gyeongbuk Province and their health and disease were analyzed. The results are as followings; First, as for seniors' condition of health, females were worse than males: the older they were and the lower their schooling and income were, they recognized bad health condition. Second, as for seniors' health care, males cared for themselves better than females: the higher their schooling and income were, the better they cared for themselves. Using the methods of health care such as walking, hiking, diet care, We found out that the low income class did not get the health examination at all. Lastly, as the most seniors in Gumi city suffer a chronic disease, the city office is needed to promote various policies like prevention of age-related disease, early discovery and delay of retrogression at its own initiative.

• Proceedings of the Korea Contents Association Conference
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• 2016.05a
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• pp.389-390
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• 2016

Since the Salamanca statement in 1994, inclusive education became the worldwide issue in the field of educational policy. Inclusive education is defined that equality and comprehensive education in the classroom to learning together regardless of whether with disability or not (Han et al, 2013). Inclusive education is the educational system and consist of the three domains; guarantee of rights, improvement in environment and reform in curriculum (Han et al, 2015). Diversity education has been positioned as an educational method in inclusive education. Diversity in classroom is very wide ranging; nationality, gender, culture, race, ethnicity, disability, age and religion. Diversity education is the educational method to providing the appropriate education for the children's diversity on the assumption that appreciate to the diversity. In recent years, the main purpose of inclusive education is to encompass children with disabilities. However, developmental disabilities that has no intellectual delay become a new challenge in education in addition to the physical and mental disability. This study aims to definition of the diversity education as the educational method in Japan.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.17 no.4
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• pp.85-93
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• 2009

Bird strike is big issue in aviation. Because a bird strike causes not only an aircraft damage but also a fatality, aviation societies are gearing up to prevent a bird strike. However, the accidents is not going down yet. Annal average of bird strikes in Korea is 1.15 accidents per ten thousand of flight, which is lower than the other country, for example 1.84 accidents in France and 2.38 accidents in Switzerland, 1.15 accidents. In the U.S.A, there are 89,727 accidents for the 19 year(1990-2008). Also flight delay is total 637,692 hours. The cost is total 350,258 billion dollar and 18,435 billion dollar per year. In related with those data's, this research is about the current and legal status of the bird strike. Also it will be useful to establish aviation safety policy and manage the bird strike.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.12 no.11
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• pp.5323-5343
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• 2018

Mobile applications and social networks tend to enhance the need for high-quality content access. To address the rapid growing demand for data services in mobile networks, it is necessary to develop efficient content caching and distribution techniques, aiming at significantly reduction of redundant content transmission and thus improve content delivery efficiency. In this article, we develop optimal cooperative content cache and distribution policy, where a geographical cluster model is designed for content retrieval across the collaborative small cell base stations (SBSs) and replacement of cache framework. Furthermore, we divide the SBS storage space into two equal parts: the first is local, the other is global content cache. We propose an algorithm to minimize the content caching delay, transmission cost and backhaul bottleneck at the edge of networks. Simulation results indicates that the proposed neighbor SBSs cooperative caching scheme brings a substantial improvement regarding content availability and cache storage capacity at the edge of networks in comparison with the current conventional cache placement approaches.

• The Journal of KAIRB
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• v.2 no.1
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• pp.1-5
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• 2020

The U.S. Department of Health and Human Services and fifteen other Federal Departments and Agencies have issued final revisions to the Federal Policy for the Protection of Human Subjects (the Common Rule, 45 CFR 46, Subpart A). The Common Rule was initially promulgated in 1991 and amended in 2005. The Final Rule to update the current regulations was published in the Federal Register on 19 January 2017. The final compliance date of the revised Common Rule including the cooperative research requirement is effective on 20 January 2020 after twice to delay. The revised Common Rule aims to make more effective conduct of minimal risk research reflecting modern research activities and recognize evolving technologies, including mobile technologies, internet, and the growth in computing power. The revisions to the Common Rule were based on a variety of sources of public, stakeholder, and expert comments. The author summarized the key changes and the implications to Korean human research regulations.

• International journal of advanced smart convergence
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• v.13 no.2
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• pp.16-24
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• 2024

With an increase in the relevance of next-generation integrated networking environments, the need to effectively utilize advanced networking techniques also increases. Specifically, integrating Software-Defined Networking (SDN) with Multi-access Edge Computing (MEC) is critical for enhancing network flexibility and addressing challenges such as security vulnerabilities and complex network management. SDN enhances operational flexibility by separating the control and data planes, introducing management complexities. This paper proposes a reinforcement learning-based network path optimization strategy within SDN environments to maximize performance, minimize latency, and optimize resource usage in MEC settings. The proposed Enhanced Proximal Policy Optimization (PPO)-based scheme effectively selects optimal routing paths in dynamic conditions, reducing average delay times to about 60 ms and lowering energy consumption. As the proposed method outperforms conventional schemes, it poses significant practical applications.

• Journal of KIISE:Computer Systems and Theory
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• v.36 no.5
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• pp.412-421
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• 2009

Due to the physical characteristics of NAND flash memory, overwrite operations are not permitted at the same location, and therefore erase operations are required prior to rewriting. These extra operations cause performance degradation of NAND flash memory file system. Since it also has an upper limit to the number of erase operations for a specific location, frequent erases should reduce the lifetime of NAND flash memory. These problems can be resolved by delaying write operations in order to improve I/O performance: however, it will lower the cache hit ratio. This paper proposes a policy of page management using double cache for NAND flash memory file system. Double cache consists of Real cache and Ghost cache to analyze page reference patterns. This policy attempts to delay write operations in Ghost cache to maintain the hit ratio in Real cache. It can also improve write performance by reducing the search time for dirty pages, since Ghost cache consists of Dirty and Clean list. We find that the hit ratio and I/O performance of our policy are improved by 20.57% and 20.59% in average, respectively, when comparing them with the existing policies. The number of write operations is also reduced by 30.75% in average, compared with of the existing policies.