• KIPS Transactions on Computer and Communication Systems
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• v.6 no.9
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• pp.369-376
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• 2017

Recently, an RSSI-based fingerprinting localization technology has been widely used in indoor location-based services. In the conventional fingerprinting method, as many APs as possible are used to increase the accuracy of location estimation. In another study, a part of APs having the strongest RSSI signal intensity are selected and used to reduce the time spent for positioning. However, it does not reflect the influence of RSSI occurred from the changes of the surrounding environments such as human movement or moving obstacles in a real environment. The environmental changes may cause the difference between the predicted RSSI signal strength value and the measured value, and thus occur an unpredictable error in the position estimation. Therefore, in order to mitigate the error caused by environmental factors, it is necessary to select APs suitable for indoor positioning estimation considering the changes in the surrounding environments. In this paper, we propose a method to select stable APs considering the influence of surrounding environments and derive a suitable positioning algorithm. In addition, we compare and analyze the performance of the proposed method with that of the existing AP selection methods through experiments.

• The Journal of the Korea Contents Association
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• v.10 no.2
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• pp.14-24
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• 2010

Because WSNs operate with limited resources of sensor nodes, its life is extended by cluster-based routing methods. In this study, we use data on direction, distance, density and residual energy in order to maximize the energy efficiency of cluster-based routing methods. Through this study, we expect to minimize the frequency of isolated nodes when selecting a new cluster head autonomously using information on the direction of the upper cluster head, and to reduce energy consumption by switching sensor nodes, which are included in both of the new cluster and the previous cluster and thus do not need to update information, into the sleep mode and updating information only for newly included sensor nodes at the setup phase using distance data. Furthermore, we enhance overall network efficiency by implementing secure and energy-efficient communication through key management robust against internal and external attacks in cluster-based routing techniques. This study suggests the modified cluster head selection scheme which uses the conserved energy in the steady-state phase by reducing unnecessary communications of unchanged nodes between selected cluster head and previous cluster head in the setup phase, and thus prolongs the network lifetime and provides secure and equal opportunity for being cluster head.

• Journal of the Korea Society of Computer and Information
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• v.16 no.10
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• pp.197-203
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• 2011

In this paper, a new cluster configuration process is proposed. The energy consumption of sensor nodes is reduced by configuring the initial setup process only once with keeping the initial cluster. Selecting the highest power consumed node of the member nodes within the cluster to the header of next round can distribute power consumption of all nodes in the cluster evenly. With this proposed way, the lifetime of the USN is increased by the reduced energy consumption of all nodes in the cluster. Also, evenly distributed power consumptions of sensors are designed to improve the energy hole problem. The effectiveness of the proposed algorithms is confirmed through simulations.

• Journal of Sericultural and Entomological Science
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• v.14 no.2
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• pp.61-65
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• 1972

The main purpose of this experiment is to select the best combining ability among KC${\times}$N13, and C20${\times}$N13 in view of the cocoon shell weight in Bombyx mori. In the spring of 1972, the author raised silkworms which were born from the crossing of the Chinese strain KC, C14, C20(female) with japanese strain N13 (male). Among each combining of crosses, the heritability of the cocoon shell weight was estimated by the method of variance analysis. The result of the experiment may he summarized as fellow; 1. For KC${\times}$N13 The cocoon shell was heavier than other combining crosses, but its heritability was lower than the others. The heritability of male moth was higher than that of female. 3. For C14${\times}$N13 The cocoon shell and the heritability was in medium value among the combining crosses, and the heritability of female moth was higher than that of male. 3. For C20${\times}$N13 The cocoon shell weigt was lower than the others, but its heritability was higher than that of others. In these combining crosses, C20${\times}$N13 is selected as a new race, which is much better than the commercial one, 103${\times}$104.

• The Journal of the Korea Contents Association
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• v.9 no.6
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• pp.62-71
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• 2009

This paper is a study on the elected korean leading actors & directors who have stable mobility power for audience and social networking. We elected 153 most reliable Korea actors and directors of stardom" (50 directors, 103 actors); they have to put on the name in the 20 high ranks, and more than twice from the total amount of Korean audience about showing 700 movies by 1998-2007. And then we analyze out 'who might be centre in social networking and social networking between actor and director," through 'Centrality Analysis' using the "UCINET" social networking analysis program Finally, we know 'Kim sang-jin director' is 'key men' and 'star' who reduced uncertainty definitely: For a long time, he combines most stable audience power with broad network successfully.

• Journal of the Korea Society of Computer and Information
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• v.14 no.11
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• pp.105-111
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• 2009

The study aims to propose the intelligent clustering technique that calculates the distance by improving the problems of multi-hop clustering technique for inter-vehicular secure communications. After calculating the distance between vehicles with no connection for rapid transit and clustering it, the connection between nodes is created through a set distance vale. Header is selected by the distance value between nodes that become the identical members, and the information within a group is transmitted to the member nodes. After selecting the header, when the header is separated due to its mobility, the urgent situation may occur. At this time, the information transfer is prepared to select the new cluster header and transmit it through using the intelligent cluster provided from node by the execution of programs included in packet. The study proposes the cluster technique of the intelligent distance estimation for the mobile Ad-hoc network that calculates the cluster with the Store-Compute-Forward method that adds computing ability to the existing Store-and-Forward routing scheme. The cluster technique of intelligent distance estimation for the mobile Ad-hoc network suggested in the study is the active and intelligent multi-hop cluster routing protocol to make secure communications.

• Venture DIGEST
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• s.70
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• pp.10-11
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• 2005

평범한 엔지니어에서 연매출 2천억원을 달성하는 벤처기업 리더로 거듭나, 벤처 성공신화의 주인공으로 꼽히는 주성엔지니어링 황철주 대표. 올해 협회 부회장으로 선출되면서 그의 행보는 더욱 바빠졌다. 세계 최고 수준의 기술력과 인재 발굴을 위한 아낌없는 투자로 일궈낸 10년의 발자취와 벤처 재도약의 선봉에 선 황대표의 포부를 들어보자.

• The Inventors News
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• no.23
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• pp.5-6
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• 2004

내 손으로 만드는 청국장 - `해외지재권 보호 설명회` 개최 - `세계여성지도자회의` 통해 세계 84개국 여성들 모여 - 2004년 변리사 1차 시험 1천53명 합격 - 권리범위확인 심판의 활용 - 특허청 직원 지재권 관련 국제회의 부의장으로 잇따라 선출 - `짝퉁상품` 고발에 내년부터 포상금 지급한다 - 한국산업재산권법학회 `국제학술세미나` 개최

• Monthly Korean Chicken
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• s.125
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• pp.51-73
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• 2005

육계자조금 설치를 위한 대의원 선거가 지난 10월 24일부터 28일까지 5일간의 일정으로 치러졌다. 전국 76개 선거구 중 74개 선거구에서 치러진 이번 대의원 선거는 68개소에서 유효 선거가 이루어져 총 135명의 대의원을 선출했다. 유효득표미달 선거구(6개 선거구)가 발생했음에도 전체 농가 참여율은 58.7%(사육수수는 63.7%)를 기록했다. 본고에서는 육계자조금 대의원 선거 현황 및 개표결과에 대해 알아본다.

• 프린팅코리아
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• s.20
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• pp.82-85
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• 2004

서울특별시인쇄정보산업협동조합 전산정보부회 초대 간사장으로 선출된 대광전산폼 김원희 사장을 인터뷰하러 간 때는 이번 겨울 들어 가장 춥다던 모든 사람들을 한껏 웅크리게 했던 날이었다. 그러나 패기 있고 당당한 모습으로 우리 일행을 맞이하는 모습에서 기세 좋던 동장군은 어느새 자취를 감추었고 히터를 끄고 진행했음에도 불구하고 인터뷰 시간 내내 열기가 넘쳤다.