• Journal of KIISE:Computing Practices and Letters
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• v.14 no.3
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• pp.321-325
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• 2008

Void areas(holes) as an inevitable phenomenon exist in geographic routing of wireless sensor networks, because the unpredictable and harsh nature application environment or uneven energy consumption. Most of the existing schemes for the issue tend to construct a static detour path to bypass a hole. The static detour path may lead to uneven energy consumption of the nodes on the perimeter of the hole; thus it may enlarge the hole. At the same time, traffic would concentrate on the peripheral node of the hole; thus the nodes on the perimeter of the hole tend to be depleted quietly. In previous work, we have proposed a hole geometric model to reduce the energy consumption and packet collisions of the nodes on the hole boundary. This scheme, however, still has the static detour path problem. Therefore, we extend the previous work by constructing a dynamic detour path hole geometric model for wireless sensor networks in this paper. The location of hole detour anchors is dynamically shifted according to Gaussian function, just generating dynamic hole detour paths.

• The Journal of the Korea Contents Association
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• v.15 no.12
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• pp.471-482
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• 2015

Situational Crisis communication theory (SCCT), one of the major crisis communication theories, suggests that crisis managers have to choose the most effective crisis response strategy in accordance to the crisis type. However, there's a controversy over whether this theory is practically applicable in Korea. Therefore, this study analyzed statements of apology to see if companies in Korea are actually taking different response strategy according to the types of crisis. According to the result of analysis on 244 apology statements published in the newspapers from 2012 to spring of 2015, adaptive response strategy was mostly taken no matter what the crisis type was. In conclusion, there's a discrepancy in crisis response strategy between the theory suggested in SCCT and the current practices in Korea. This conclusion can contribute to devising an appropriate application of SCCT in Korea and to develop a more Korea relevant theory.

• The Journal of the Korea Contents Association
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• v.8 no.11
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• pp.85-93
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• 2008

For music score recognition, several approaches have been proposed including shape matching, statistical methods, neural network based methods and structural methods. In this paper, we deal with recognition for low resolution images which are captured by the digital camera of a mobile phone. Considerable distortions are included in these low resolution images, so when existing technology is used, many problems appear. First, captured images are not stable in the sense that they contain lots of distortions or non-uniform illumination changes. Therefore, notes or symbols in the music score are damaged and recognition process gets difficult. This paper presents recognition technology to overcome these problems. First, musical note to head, stick, tail part are separated. Then template matching on head part of musical note, and remainder part is applied. Experimental results show nearly 100% recognition rate for music scores with single musical notes.

• The Journal of the Korea Contents Association
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• v.15 no.12
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• pp.525-533
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• 2015

The evolution of spectrum sharing technology enables the creation of many business scenarios and business models such as TV white space service. Business models considering spectrum sharing should guarantee economic feasibility for service providers and increasing benefit for service users. In addition, new business models should contribute to economic activation in the wireless telecommunication service industry. It is therefore necessary to design quantitative evaluation methods for selection of the best business models. The methods should reflect the various points of view of valuation. Our research addresses evaluation method for business models considering spectrum sharing. We define evaluation indicators to reflect the distinct characteristics of spectrum sharing. Also, we adopt analytic hierarchy process(AHP) to derive the weights of each indicator to evaluate business models considering spectrum sharing.

• Journal of the Korea Convergence Society
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• v.6 no.5
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• pp.207-217
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• 2015

A Study on Problem of Impeachment Evidence in Criminal Proceedings for Employ by the Convergence Meaning of impeachment evidence in criminal proceedings is liking the spread of the branches moment. The first, there is to set limits of impeachment evidence. The amicable solution is to accept moving flexibly. In a concrete way must to make away with a constituent element unlawfulness. The second, problem a return to probative force exist. This problem agree in principle to resolve an issue for the testimony of an eyewitness. The third, how to admit that institution of criminal investigation after the testimony of an eyewitness exist. This attendant conditions are to eliminate illegality for the authenticity in he testimony of an eyewitness and for the observe due process. Therefore, we must observe due process without illegality to solve the problem for the convergence.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.11
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• pp.5834-5840
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• 2013

Along with the development of high-speed, wired and wireless Internet technology, various harmful images in a form of photos and video clips have become prevalent these days. In this paper, we suggest a method of automatically detecting adult images by extracting woman's nipple areas which represent obscenity of the image. The suggested algorithm first segments skin color areas in the $YC_bC_r$ color space from input images and extracts nipple's candidate areas from the segmented skin areas through the suggested nipple map. We then select real nipple areas by using geometrical information and determines input images as harmful images if they contain nipples. Experimental results show that the suggested nipple map-based method effectively detects adult images.

• Journal of Internet Computing and Services
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• v.10 no.5
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• pp.95-105
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• 2009

There are various studies to provide useful information for users on huge data of web-sites. Web usage mining among them is a method to extract meaningful patterns based on web users' log data. Most of existing patterns of web usage mining, however, had not considered users' diverse inclination but created general models. Web users' keywords can have various meaning upon their tendency and background knowledge. This study is for generating Multi Concept Keyword Model (MCK-Model) by analyzing web usage information on users' keywords of interest. MCK-Model can supply web page network for various inclination based on users' keywords of interest. Also, MCK-Model can be used to recommend the most proper web pages and it has been confirmed that the suggested method is useful enough.

• Journal of Internet Computing and Services
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• v.15 no.4
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• pp.119-124
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• 2014

Blind adaptive systems based on the Euclidean distance (ED) between the distribution function of the output samples and that of a set of random symbols generated at the receiver matching with the distribution function of the transmitted symbol points estimate the ED at each iteration time to examine its convergence state or its minimum ED value. The problem is that this ED estimation obtained by block?data processing requires a heavy calculation burden. In this paper, a recursive ED estimation method is proposed that reduces the computational complexity by way of utilizing the relationship between the current and previous states of the datablock. The relationship provides a ground that the currently estimated ED value can be used for the estimation of the next ED without the need for processing the whole new data block. From the simulation results the proposed recursive ED estimation shows the same estimation values as that of the conventional method, and in the aspect of computational burden, the proposed method requires only O(N) at each iteration time while the conventional block?processing method does $O(N^2)$.

• The Journal of the Korea Contents Association
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• v.12 no.7
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• pp.102-113
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• 2012

Hangeul is growing as cultural icon representing Korea. And Hangeul is scientific and is too systematics for words as the guide of modern design. First it can make the variable and beautiful foams like dot, line and plane. It also has the basic design principles like symmetry and repetition. The purpose of this study is to develop textile designs using the formative characteristics of Hangeul. So in this study it was chosen 'ㄱ, ㄹ, ㅁ, ㅂ, ㅅ, ㅇ, ㅍ' of Hangeul's consonants and 'ㅑ, ㅕ' of Hangeul's vowels as the subject materials of textile designs development to develop textile designs expressed the geometrical shapes and formative beauty of Hangeul. Those are designed by using a variety of motifs that recast the shapes of Hangeul. So six textile designs for necktie and scarf were developed. Through this study it will be offered to the possibility of products that was based on Hangeul.

• Journal of the Institute of Convergence Signal Processing
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• v.11 no.2
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• pp.157-162
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• 2010

In this paper we propose a fractal analysis based on the discrete wavelet transform. It is well known that Fourier Transform is widely used for frequency analysis of random signal. However, the frequency domain is not used for expressing the sudden signal change and non-stationary signal at the time-axis by this method. Maximum value in the wavelet modules can be expressed by the Lipschitz exponent, which is useful to represent the characteristics of signal or the edge of an image. It is possible to reconstruct the original image only by using the few maximum points. The v possible image It iusing oil was acquired to interpret the maximum value. ufter that, it was applied to the v possible image of a ship model. In addition, the fractal dimens by by the conlapse process of the sediment particle was examined. In this paper, the fractal dimens by has been obtained by the maximum value and the experiment obtained from the visualized image also acquired the same result as existing methods.