• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.8 no.6
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• pp.63-69
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• 2008

In this paper, our goal is to find a power-effective protocol that improves the accuracy of transmission in sensor networks. Therefore we propose a cooperative communication protocol based on MRC(Maximal Ratio Combining) and cyclic code. In our proposal, one sensor node assists two others to communicate with a clusterhead that can get diversity effect and MRC can improve diversity effect also. The proposed protocol with cyclic code can correct error up to 3-bit and reduce decoding complexity compared with convolutional code. Simulation results reveal proposed protocol can save the network energy up to 6dB over single-hop protocol at BER(Bit Error Rate) of $10^{-2}$.

• Journal of the Korea Fashion and Costume Design Association
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• v.12 no.2
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• pp.41-54
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• 2010

This paper aims at studying about spatial structures and formative characteristics of Lucy Orta's fashion design. Her works utilizes the thought related on the architectural space that has been revealed sharp change of the paradigm since the late of 20th century. Lucy Orta against individualism of the urban life, and manufactures portable and moving housing and multi-functional fashion that is paved with individual rest unit and give a sense of security through simple combination among the units. Besides, she has development multiple portable clothing and equipments for the rescuethrough exploiting pioneering high technology. The results of this study can be summarized as the following: 1) refuge habitant creates individual space for physical and mental protection from the urban surrounding, 2) nomadic dwelling shows multi-functional fashion space fit for digital nomads' life style aims at continuous movement, 3) connective nexus and urban life guard are comprise of detachable individual unit in public space for remaking of the bonds, affinity, and relationship, and the complex of rescue clothing and equipments for meeting a challenge of the threat about human existence from uncertain environmental change in the future.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.11
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• pp.803-809
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• 2014

In this paper, we investigate physical layer security in a cooperative cognitive radio networks (CRN) with a relay selection in the presence of a primary user and an eavesdropper. To protect the CRN from wiretapping by the eavesdropper, we propose employing an opportunistic relay selection scheme and multiple antennas at the destination that work based on the availability of channel state information at the receivers. Under these configurations, we derive an exact closed-form expression for the secrecy outage probability of the CRN, and also derive an asymptotic probability. Numerical results will be presented to verify the analysis.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.4 no.1
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• pp.5-24
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• 2010

Data fusion is an attractive technology because it allows various trade-offs related to performance metrics, e.g., energy, latency, accuracy, fault-tolerance and security in wireless sensor networks (WSNs). Under a complicated environment, each sensor node must be equipped with more than one type of sensor module to monitor multi-targets, so that the complexity for the fusion process is increased due to the existence of various physical attributes. In this paper, we first investigate the process and performance of multi-attribute fusion in data gathering of WSNs, and then propose a self-adaptive threshold method to balance the different change rates of each attributive data. Furthermore, we present a method to measure the energy-conservation efficiency of multi-attribute fusion. Based on our proposed methods, we design a novel energy equilibrium routing method for WSNs, viz., multi-attribute fusion tree (MAFT). Simulation results demonstrate that MAFT achieves very good performance in terms of the network lifetime.

• Journal of Broadcast Engineering
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• v.21 no.1
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• pp.105-108
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• 2016

In this paper, a cooperative jamming network with multiple relays and multiple eavesdroppers is investigated. Among the relays, one best relay is selected to amplify and forward the signal to destination through two phases. To confuse eavesdroppers, the destination transmits a jamming signal in the first phase and the source transmits jamming signal in the second phase. Secrecy rate of this system is derived, and based on the available channel state information (CSI), relay selection schemes are proposed, respectively. Numerical results show that the performance of the proposed relay selection scheme outperforms than that of random relay selection scheme.

• Journal of Korea Multimedia Society
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• v.23 no.5
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• pp.673-682
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• 2020

Buildings are becoming more and more high-rise and large-scale in recent years, so in the event of a disaster such as a fire, enormous human and economic damage is expected. Therefore, management, security, and fire control are essential for large buildings in the city. Because these large buildings are very complex outside and inside, they need a three-dimensional control based on 3D modeling rather than a simple flat-oriented control. To do this, this paper designed and implemented a building control system based on 3D modeling. Specifically, we designed a 3D building / facility editing module for 3D modeling of buildings, a 3D based control module for building control, and a linkage module that connects information such as firefighting equipment, electrical equipment and IoT equipment. Based on this design, a building control system based on 3D modeling was implemented.

• Korean Journal of Human Ecology
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• v.23 no.5
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• pp.957-968
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• 2014

The purpose of the study was to find out the meaning of housing and choice factors of housing of the university students. The snowballing method was used to collect the data for analysis. The data were collected from April 4th to 14, 2013, and the sample consisted of 122 university students and 40 pairs of university students and their parents in Seoul. It was examined the meaning of housing and choice factors by university students. The finding of this study was as follows: 1) The meaning of housing was composed of 9types : 'Family harmony space', 'Emotional space', 'Social status space', 'Life space', 'Social relations space', 'Economic space', 'Perform the role space', 'Physical safety space' and 'Privacy space'. 2) The choice factors of housing were composed of 7types : 'Social status', 'Life with Neighborhood', 'Safety and security', 'Transportation and education', 'Ease of use of facilities', 'Economic' and 'Environment'.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.12
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• pp.2852-2857
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• 2015

Assault and violence in the elevator is a crime that occurs most frequently. In particular, these days, is a phenomenon that occurs frequently, knowing that there is a CCTV camera. In this paper, we extract the phenomena of contact between people in the elevator. Many people ride the elevator does not cause these symptoms. However, this crime occurs when fewer people ride the elevator. Extraction method of contact is seeking the skeleton of binary image and extracts the contact status of each skeleton. Therefore, immediately detecting the violence and assaults that occur in the elevator and to notify the security office of the building.

• Journal of the Korea Computer Industry Society
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• v.4 no.4
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• pp.647-660
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• 2003

The present of state is situation that is realized by necessity of maintenance of public security about great many information is real condition been increasing continually in knowledge info-age been situating in wide field of national defense, public peace, banking, politics, education etc. Also, loss or forgetfulness, and peculation by ID for individual information and number increase of password in Internet called that is sea of information is resulting various social problem. By alternative about these problem, including Biometrics, several authentication systems through sign(Signature), Smart Card, Watermarking technology are developed. Therefore, This paper shows that extract factor that efficiency can get into peculiar feature in physical features for good fingerprint recognition algorithm implementation with old study finding that take advantage of special quality of these fingerprint.

• Journal of Distribution Science
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• v.15 no.2
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• pp.27-36
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• 2017

Purpose - This study was intended to find the selection attribution factors and service satisfaction determinants of third party logistics suppliers in Dongdaemun wholesale market. Research design, data, and methodology - A questionnaire survey was performed, and the retailers and wholesalers in Dongdaemun wholesale market were asked to fill in it. Company employees using third party logistics service were selected by a random sampling method. Results - It is easy for both retailers and wholesalers to use third party logistics service. The logistics companies in Dongdaemun wholesale market have paid more heed to the security of freight and the operability. That is, the freight safety and operating service are the most important factors in selecting third party logistics suppliers, and they both have a close relationship with user satisfaction. There is no relation between service level and recognition in selection factors of third party logistics suppliers. All the responsiveness, operability and informativeness of third-party logistics providers has a significant relationship with user satisfaction. Conclusions - Third party logistics service is entirely different from the existing delivery or transport service. The most market vendors' wish for third party logistics suppliers is the stability of freight and robust operating service. They also demand the responsiveness for special or emergency situation with having information strength.