• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.4
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• pp.817-827
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• 2015

In this modern society, people are having a close relationship with smartphone. This makes easier for hackers to gain the user's information by installing the malware in the user's smartphone without the user's authority. This kind of action are threats to the user's privacy. The malware characteristics are different to the general applications. It requires the user's authority. In this paper, we proposed a new classification method of user requirements method by each application using the Principle Component Analysis(PCA) and Probabilistic K-Nearest Neighbor(PKNN) methods. The combination of those method outputs the improved result to classify between malware and general applications. By using the K-fold Cross Validation, the measurement precision of PKNN is improved compare to the previous K-Nearest Neighbor(KNN). The classification which difficult to solve by KNN also can be solve by PKNN with optimizing the discovering the parameter k and ${\beta}$. Also the sample that has being use in this experiment is based on the Contagio.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2006.05a
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• pp.210-214
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• 2006

Along with the development of industrious society, the shape of city and the way of life have changed in accordance. The development of the city deepened gravitation of the city population, leading to the lack of housing and land, and apartment complexes became an alternative way of securing a number of families into a small space of land. Apartment can have a lot of families reside In a small space of land, and it can also be satisfactory to individual's privacy and anti-crime measures. On the other hand, there are negative problems with it. Among them, contacts with neighboring people showed that they only greeted each other when they met in the walkway. As shown in this, one of the reasons that there is a lack of friend ship activities is because there is short of space for common use. And in comparison to those of stairway walkway, apartments with one-passage walk way showed a higher level of contacts with neighbors. It is assumed that apartments with one-passage walk way have more chances to meet neighbors than do those of stairway walkway. This study analyzed the phases appearing in neighbor relations through investigation of the literature, and presented a coping measure. One solution is to prepare flower beds from the outside of walkway by enlarging the width of the walkway in apartments with one-passage walk way, and providing benches in front of flower beds so that residents can take a rest there. The more often residential people take a rest there, the more frequently they can meet each other. Accordingly this can solve problems of contacts with neighbors and the dreary scene of walkway can become a wider view in a nature friendly environment, bringing them to an active acquaintance activities.

• The Journal of Korean Association of Computer Education
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• v.18 no.4
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• pp.55-62
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• 2015

Recommender systems through collaborative filtering has been utilized successfully in various areas by providing with convenience in searching information. Measuring similarity is critical in determining performance of these systems, because it is the criteria for the range of recommenders. This study analyzes distributions of similarity from traditional measures and investigates relations between similarities and the number of co-rated items. With this, this study suggests a method for selecting reliable recommenders by restricting similarities, which compensates for the drawbacks of previous measures. Experimental results showed that restricting similarities of neighbors by upper and lower thresholds yield superior performance than previous methods, especially when consulting fewer nearest neighbors. Maximum improvement of 0.047 for cosine similarity and that of 0.03 for Pearson was achieved. This result tells that a collaborative filtering system using Pearson or cosine similarities should not consult neighbors with very high or low similarities.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.4B
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• pp.647-658
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• 2010

Many localization schemes estimate the locations of radio nodes based on the physical locations of anchors and the connectivity from the anchors. Since they only consider the knowledge of the anchors without else other nodes, they are likely to have enormous error in location estimate unless the range information from the anchors is accurate or there are sufficiently many anchors. In this paper, we propose a novel localization algorithm with the location knowledge of anchors and even one-hop neighbors to localize unknown nodes in the uniform distance from all the one-hop neighbors without the range information. The node in the uniform distance to its all neighbors reduces the location error relative to the neighbors. It further alleviates the location error between its actual and estimated locations. We evaluate our algorithm through extensive simulations under a variety of node densities and anchor placement methods.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.29 no.3
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• pp.41-63
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• 2018

This study aimed at analyzing journals and index terms, authors of the reformed theology and evangelicalism, neutral theological position by using bibliometrical analyzing methods. The analyzing methods are average linkage and neighbor centralities, profile cosine similarities. Especially, when analyzing the relationship between authors, we interpreted the research topic by finding the key shared index terms between the authors. In the journal analysis results, 9 journals were largely clustered together in the two clusters of the reformed theology and evangelicalism, but Presbyterian Theological Quarterly that is thought to be a reformed journal was clustered in evangelical cluster. In the index terms analysis results of the clusters, the reformed theology and evangelicalism were key words representing the two clusters. In the authors' analysis results, we had 9 clusters and the Presbyterian theologian studying the reformed theology had the four clusters and the non-Presbyterian theologian had the 5 clusters. Therefore, we consistently had the two clusters of the reformed theology and evangelicalism in all the analysis of the journals and the index terms, the authors.

• The KIPS Transactions:PartC
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• v.18C no.3
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• pp.187-194
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• 2011

IEEE 802.11 wireless LAN has become the center of attention for one of the most dominant wireless networking technologies nowadays. In densely deployed wireless LANs, mobile stations are exposed to a number of AP, thus it is needed to select the best AP to associate with. The most common approach is to select the AP with the highest received signal strength. However it does not consider traffic load imposed to each AP so that it may cause the poor network performance. Therefore, in this paper, we propose a throughput estimation scheme for neighboring APs by sniffing the traffic within 802.11 networks. We devise a tool, named "VirtFrame", which is to estimate the station's capable throughput from neighbor APs based on the channel access time by virtually combining the sniffed frames. Simulation results show that our proposed scheme well matches that there exists correlation between the channel access time and the actual throughput of the APs.

• Journal of the Korean Chemical Society
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• v.12 no.1
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• pp.18-25
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• 1968

액체 분자는 고체, 천이상태 및 기체와 같은 자유도를 갖는다는 액체구조에 관한 천이상태이론을 적용하여 액체의 표면장력과 점도를 계산하여 측정 치와 좋은 일치를 얻었다. 표면장력을 계산함에 있어서 표면 각층의 밀도는 이웃 층 사이의 밀도를 주는 관계식으로부터 쉽게 얻었다. 그리고 액체가 점성 흐름을 할때 활성화된 분자는 흐르는 방향으로는 기체와 같은 자유도를 가지나, 이에 직교한 평면상에서는 천이상태 및 기체와 같은 자유도를 갖는다고 가정하였다.

• 월간낙농육우
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• v.35 no.8
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• pp.126-134
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• 2015

낙농가가 일반소비자들을 대면해 우리우유에 대해 이야기 나누고 낙농의 가치를 직접 알릴 수 있는 기회가 많아졌다. 지역마다 벌이고 있는 우유소비촉진 행사가 그렇고 소비자들이 낙농의 현장을 직접 느낄 수 있도록 목장 내 체험프로그램이나 문화행사와 같은 다양한 형태의 사업들도 운영되고 있다. 사실 어떠한 농축산업을 보아도 낙농만큼 보고 느낄만한 것이 많은 분야도 없을 것이다. 이렇게 흥미로운 소재를 갖고 있는 만큼 일반인들에게 친근하게 전해질 수 있다면 더욱 좋겠다. 안타깝게도 우리는 매일 있는 현장이니 대수롭지 않지만, 일반 소비자들에게 보기에 불편한 모습도 있을 수 있다는 것을 인지할 필요가 있다. 커다란 생명을 다루는 일이니 매일 엄청난 양의 분뇨가 퇴적되고 그래서 좋지못한 냄새가 발생되는 것은 당연하지만 아무런 책임의식없이 이를 방치를 하여 목장의 주변에 불편함을 제공해선 안된다는 것이다. 불편함이란 매우 주관 적일 수 있지만 그들의 느낌과 감정을 의식하지 않을 수 없게 되었다. 협회가 오랜기간 추진해온 깨끗한목장가꾸기운동 자체가 많은 것을 해결할 수는 없지만, 사육환경을 개선하고 주변 이웃들과 더불어 삶을 영위하고자 하는 요령과 정신을 담고 있다. 대체로 그렇듯, 매년 우수목장으로 선정된 목장주들을 보면 상당수가 늘 밝은 인상에 외지인들을 빈객 맞듯 대접하며, 좋은 것이 있으면 주변거주인들과도 나누며 원만한 관계를 유지하는 모습을 볼 수 있었다. 해도해도 끝이없는 목장일들, 수입유제품은 넘치고 우유는 남는다는데 이 모든게 농가잘못이라는 듯 몰아가는 요즘 일상의 작업들만으로도 이미 충분히 힘들고 괴로운 시기이다. 하지만 대대손손 이어가는 우리목장, 사회에 지속적으로 기여하는 낙농산업을 위해 더 넓게 그리고 자주 주변의 이웃과 소비지들의 시선을 의식하며 깨끗한목장가꾸기운동을 통해 우리 자신을 점검해볼 수 있었으면 좋겠다. 월간 낙농육우는 잘 관리된 목장환경을 기반으로 소비자들과의 교류에도 노력하며 우리낙농의 가치를 열심히 전달하고 있는 모범적인 목장을 둘러보았다.

• Journal of Broadcast Engineering
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• v.20 no.6
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• pp.912-920
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• 2015

Unlike general texture-based feature description algorithms, Locally Likely Arrangement Hashing (LLAH) algorithm describes a feature based on the geometric relationship between its neighbors. Thus, even in poor-textured scenes or large camera pose changes, it can successfully describe and track features and enables to implement augmented reality. This paper aims to optimize the performance of LLAH algorithm for tracking random dots (= features) with Gaussian noise. For this purpose, images with different number of features and magnitude of Gaussian noise are prepared. Then, the performance of LLAH algorithm according to the conditions: the number of neighbors, the type of geometric invariants, and the distance between features, is analyzed, and the optimal conditions are determined. With the optimal conditions, each feature could be matched and tracked in real-time with a matching rate of more than 80%.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2004.11a
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• pp.251-256
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• 2004

The purpose of this study is to identify and compare the range of dwellers and the use of pattern in public common space for dwellers of high-rised apartment of staircase type and gallery type. Also, it is to ascertain the relationship between extent of neighborhood and community awareness. The results were as follows. The term of habitation of most apartment dwellers surveyed were relatively short and most of dwellers had a small family that having a minor children.'Relational association with their neighbor in apartment of staircase type was happened between families that use the same entrance and elevator and it in gaiter type was happened inside the family. But intimacy rate and range of interest were not that high additively, int the case needs a conversation with neighbor, it happened in individual entrance and elevator hall rather than inside the house and exterior area.