• Journal of information and communication convergence engineering
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• v.3 no.4
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• pp.176-178
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• 2005

This paper presents closed-form expressions for exact bit error rate of MSK and OQPSK systems employing an adaptive antenna array at base station to eliminate co-channel interference. The channels under consideration are AWGN and one-path flat Rayleigh fading with AWGN. Computer simulation is carried out to confirm the theoretical results.

• ETRI Journal
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• v.26 no.2
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• pp.181-184
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• 2004

For communication between heterogeneous conference systems, it is important to build a conference control protocol independent from signaling protocols. We simulate an XML-based conference control that is under consideration as a standard mechanism. We describe the framework and operations for easy implementation in heterogeneous conference systems. The simulation results show that the proposed control protocol provides a consistent service for an increasing number of conferences and participants in small to mid-size centralized conferencing.

• Proceedings of the KIEE Conference
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• 2007.10a
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• pp.437-438
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• 2007

본 논문에서는 우리의 일상생활에 많이 이용되고 있는 무선채널의 시변특성 및 확률론적 모델에 대해 고찰한다. 채널의 일반적인 시간영역 및 주파수 영역에서의 선형시변 특성의 물리적인 의미를 고찰하고 마지막으로 확률론적인 채널 특성을 나타내는 상관함수의 의미를 고찰한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.7
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• pp.1746-1755
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• 1996

In this paper, we propose the protocol stact and the server functions of IWU which interconnects distributed LAN's users by using of B-ISDN. The protocol stact of interconnecting IWU under consideration users TCP/IP in upper layer. TCP/IP is popular communication protocol in interconnecting distributed LANs. The interconnecting IWU has server functions for transfering datagrams to B-ISDN such as address translation, fragment and reassembly, CL server, signalling and traffic control. We analyze the performance ofinterconnecting IWU with M/M/1/K queueing model and obtain the throughput and buffer size of interconnecting IWU.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1985.10a
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• pp.109-112
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• 1985

This paper proposes a algorithm of phonemes extraction in korean character pattern recognition. The phonemes are classified into the patterns which are separable and connected with each other. The former is extracted by means of pattern matching in consideration of topological structure of ponemes and direction of stroke sequentially. The latter is extracted by means of index and window algorithm which are performed by a 3$\times$3 sequential local operation in the thinned character pattern.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.11a
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• pp.163-163
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• 2004

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.8
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• pp.5571-5578
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• 2015

In this paper, we analyzed Alamouti based the MIMO-OFDM system in an underwater vertical communication channels. These in consideration both the transmission loss the multipath loss which is suitable for underwater environment are necessary method to improve the efficiency and communication performance in underwater communication. This paper is modeled in an environment that caused the error, considered each simulated the multi-path loss, transmission loss, the Doppler spread in order to implement a practical communication environment and simulated through the MIMO-OFDM system of Alamouti STBC method. The MIMO-OFDM system 2Tx-2Rx of Alamouti STBC scheme in underwater vertical communication system is obtained about 3~5 dB gain as compare with its 2Tx-1Rx scheme with reference $10^{-3}$ BER.

• Journal of the Korea Institute of Building Construction
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• v.16 no.2
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• pp.161-167
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• 2016

The collaboration with members are very important things to manage the field organization in the building construction project. These collaborations are related with the communication in the organization, so the field organization ability could be advanced by improving the communication level. However, the research about communication in building construction field organizations has rarely studied. Therefore, the purpose of this study is to analyze the organizational factors to influence the communications in building construction field organizations. In this study, the leadership style of head managers and organizational cultural characteristics is determined the factors to influence the communication level by literature reviewing. The results of this study showed that the communication level is good when head managers in building construction site had an idealized influence style leadership and individual consideration style leadership. In addition, the good communicated field organizations had the higher characteristics of a consensus culture and development culture. This study is expected to help to improve the performance of the building construction field organizations.

• Journal of Sensor Science and Technology
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• v.20 no.4
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• pp.272-278
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• 2011

Recently, the performance of binaural hearing aids is rapidly improved with the technology advancement of wireless communication, digital signal processing, and integrated circuit design. However, the previous hearing aids developer platforms can't be applied to binaural hearing aids developing, because it has no consideration for wireless communication and binaural hearing control. Also, the previous developer platforms are not easy to use for the algorithm development, because programming languages are limited. In this paper, we designed and implemented the open platform board for binaural hearing aids developing. The designed board can be programmed by general programming language and can be used wireless communication module. In order to verify the designed open platform board, we used the volume control algorithm using two open platform board. As a result of experiment, we verified the performance of designed and implemented open platform board that was successfully operated the binaural hearing control and the wireless communication.

• Journal of the Korea Society of Computer and Information
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• v.27 no.4
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• pp.205-212
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• 2022

The purpose of this study was to analyze the structural relationship between the informational leadership, self-efficacy, communication ability, and job satisfaction of secondary school teachers. In order to achieve the purpose of this study, the following research questions were set up. First, what is the structural relationship between teachers' information leadership, self-efficacy, communication ability, and job satisfaction? Second, what is the mediating effect of self-efficacy and communication ability in the influence of teachers' informational leadership on job satisfaction? J-Do's secondary school was sampled through random sampling from the population. A total of 600 subjects were sampled. The results of this study show that for secondary school teachers, self-efficacy and communication skills play an important role as a motivating factor for job satisfaction. To have teachers' self-efficacy and communication skills, teachers' respect for opinions and participation in decision-making on school management It should be developed in the direction of expanding and creating a cooperative organizational climate. In addition, it was found that it was necessary to change individual teachers' efforts or perceptions in consideration of individual characteristics and environmental characteristics.