• Journal of Korea Society of Digital Industry and Information Management
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• v.10 no.4
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• pp.1-9
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• 2014

Recently, with the enlargement of cloud computing, virtual desktop infrastructure(VDI) can be an alternative of the existing personal computer based information environment. For the case of partially introduced VDI coexisting with personal computer environment, we suggest a virtual folder based approach to control the overall digital contents within an organization with a case of implementation. Although a centralizing device was used for storage and sharing of organization's digital contents, it was not easy to accomplish centralizing digital contents completely. It is tried to prevent users from utilizing their own storage in their personal computers or virtual machines and to use virtual folder which transfer and store digital contents to and in EDMS. The virtual folder system of this paper looks like a real folder in a personal computer, but it is another virtual device for outer storage devices including EDMS. It can be an alternative and reference of digital contents control for future applications of cloud computing.

• Archives of Plastic Surgery
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• v.48 no.1
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• pp.121-126
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• 2021

Background Despite the wide demand for thin flaps for various types of extremity reconstruction, the thin elevation technique for anterolateral thigh (ALT) flaps is not very popular because of its technical difficulty and safety concerns. This study proposes a novel perforator-centralizing technique for super-thin ALT flaps and analyzes its effects in comparison with a skewed-perforator group. Methods From June 2018 to January 2020, 41 patients who required coverage of various types of defects with a single perforator-based super-thin ALT free flap were enrolled. The incidence of partial necrosis and proportion of the necrotic area were analyzed on postoperative day 20 according to the location of superficial penetrating perforators along the flap. The centralized-perforator group was defined as having a perforator anchored to the middle third of the x- and y-axes of the flap, while the skewed-perforator group was defined as having a perforator anchored outside of the middle third of the x- and y-axes of the flap. Results No statistically significant difference in flap thickness and dimension was found between the two groups. The arterial and venous anastomosis patterns of patients in both groups were not significantly different. Only the mean partial necrotic area showed a statistically significant difference between the two groups (centralized-perforator group, 3.4%±2.2%; skewed-perforator group, 15.8%±8.6%; P=0.022). Conclusions The present study demonstrated that super-thin ALT perforator flaps can be elevated safely, with minimal partial necrosis, using the perforator-centralizing technique.

• Communications of the Korean Mathematical Society
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• v.26 no.3
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• pp.445-454
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• 2011

In this paper, we extend some well known results concerning generalized derivations of prime rings to a generalized (${\sigma}$, ${\tau}$)-derivation.

• Communications of the Korean Mathematical Society
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• v.34 no.4
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• pp.1099-1104
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• 2019

In [1], Ali and Dar proved the ${\ast}$-version of classical theorem due to Posner [15, Theorem] with involution of the second kind. The main objective of this paper is to improve the above mentioned result without the condition of the second kind involution. Moreover, a related result has been discussed.

• Bulletin of the Korean Mathematical Society
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• v.51 no.1
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• pp.207-211
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• 2014

The aim of this paper is to prove the next result. Let n > 1 be an integer and let R be a n!-torsion free semiprime ring. Suppose that f : R ${\rightarrow}$ R is an additive mapping satisfying the relation [f(x), $x^n$] = 0 for all $x{\in}R$. Then f is commuting on R.

• Communications for Statistical Applications and Methods
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• v.6 no.2
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• pp.457-466
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• 1999

Centered modified systematic sampling (CMSS)' was proposed by Kim(1985) for estimating the mean of a population with a linear trend. In the present paper a version of this sampling method is suggested. This version turns out to be efficient in the same degree as the original method from the viewpoint of the expected mean square error criterion. It is also shown to be quite an efficient method as compared with other existing methods. An illustrative example is given.

• Journal of applied mathematics & informatics
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• v.6 no.1
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• pp.239-246
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• 1999

The purpose of this paper is to prove the following result: Let R be a 2-torsion free noncommutative semi-prime ring and D:RlongrightarrowR a derivation. Suppose that $[[D(\chi),\chi],\chi]\in$ Z(R) holds for all $\chi \in R$. Then D is commuting on R.

• Korean journal of communication and information
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• v.62
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• pp.140-158
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• 2013

The purpose of this study is to analyze the media policy of the Third Republic and its influence on local newspapers in Korea. Just after the May 16th coup Military Government enforced the press merger and abolition and in 1962 announced the direction of the media policy and its implementation standards. These standards had a serious impact on local newspapers. It had resulted in weakening the reporting activities and aggravating the financial difficulties of the local newspapers. The media policy in 1971, which was in the form of self-purification resolutions of media corporations limited the dissemination and weakened the activities of local newspapers. By these measures the centralizing to Seoul of the media had to be deepened. The industrialization policy promoted by the Third Republic exacerbated this centralizing process.

• Journal of the Economic Geographical Society of Korea
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• v.5 no.1
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• pp.25-48
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• 2002

This study is to clarify the effect of changes of cultural industries, specialized products and regional festival, in "Junwon culture region". According to this study, "Junuon culture region", as border region of Koguryo, Baekje, Silla kingdom, which has not constituted its original culture, must develop its own specialized products based on culture and history of the three kingdoms in modern meaning. In 21st century, cultural industry of "Junuon culture region" must emphasize the role of linking of Koguryo culture which consists of major culture in North Korea. Because regional festival of "Junuon culture region" as place marketing is concentrated in spring and autumn, regional festival must be a package type of interregional network. In 21st century, "Junwon culture region" as border region of Koguryo, Baekje, and Silla, must be the peace place of cultural industry with maximized merit and high accessibility at present time. And with development of knowledge and information society, cultural industry estate must bring up regional network centralizing Cheongju city.ng up regional network centralizing Cheongju city.

• Communications of the Korean Mathematical Society
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• v.27 no.3
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• pp.441-448
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• 2012

Let R be a prime ring with center Z and characteristic different from two, U a nonzero Lie ideal of R such that $u^2{\in}U$ for all $u{\in}U$ and $d$ be a nonzero (${\sigma}$, ${\tau}$)-derivation of R. We prove the following results: (i) If $[d(u),u]_{{\sigma},{\tau}}$ = 0 or $[d(u),u]_{{\sigma},{\tau}}{\in}C_{{\sigma},{\tau}}$ for all $u{\in}U$, then $U{\subseteq}Z$. (ii) If $a{\in}R$ and $[d(u),a]_{{\sigma},{\tau}}$ = 0 for all $u{\in}U$, then $U{\subseteq}Z$ or $a{\in}Z$. (iii) If $d([u,v])={\pm}[u,v]_{{\sigma},{\tau}}$ for all $u{\in}U$, then $U{\subseteq}Z$.