• Journal of Information Technology Services
• /
• v.8 no.3
• /
• pp.111-134
• /
• 2009

We are living it what is referred to as the Digital Era; a time in which communication through the computer medium has deeply infiltrated our everyday lives and is now equivalent to face-to-face communication. In other words, e-communication is the core factor of knowledge sharing, for not only individuals but also for corporations, and its efficiency has increased gradually. At this time, studies on the factors affecting the outsourcing performance of e-communication channel services are gaining importance. Therefore, the purpose of this study is to empirically analyze the effects of the system, information, and service quality on the user satisfaction and user trust of e-communication channel outsourcing, as well as the effects of user satisfaction and user trust on the outsourcing performance of both individuals and organizations. In the results of the empirical study, the system, Information, and service quality appear to have a significant effect on both user satisfaction and user trust. In addition, user satisfaction and user trust appear to also have a significant effect on the outsourcing performance of both Individuals and organizations.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.16 no.6
• /
• pp.1069-1074
• /
• 2021

Recently, mobile communication technology has new eras with supply of 5G commercial communication. 5G mobile communication service is currently supplied with city area, services will be quickly expanded to entire area of country. This mmWave based 5G mobile communication is under spreading for human communication with voice and Internet service. After completion of construction of this human communication, this technology will be expanded to industrial communications. Railway communication system is an example of this industrial communications. In this, performance of traffic transmission for railway communication network based on this 5G railway communication networks will be analyzed with computer simulations. Construction requirements of 5G railway communication networks will be suggested with this analysis results.

• Korean Medical Education Review
• /
• v.13 no.1
• /
• pp.35-43
• /
• 2011

Purpose: Communication skills are considered as one of the essential requirements in medical education, and the training often involves exercising medical interviews with standardized patients(SP) or role play. This study investigated the helpfulness of the communication skills training programs for students' performance on the clinical performance examination (CPX). Methods: Fourth-year students who have taken one of two communication skills programs(exercising communication skills with SP or elective communication skill course with role play) completed a questionnaire on their evaluation of the helpfulness of communication skills programs immediately after finishing the CPX. Then, the programs were objectively assessed by comparing all fourth-year students' CPX scores between program participants and non-participants. Results: About 70% of participants answered that the programs were helpful to perform clinical clerkship and CPX. However, there was no difference in either the total CPX score or 2 categorical scores(integrated clinical encounter, communication and interpersonal skill) between program participants and non-participants. Conclusion: Although the students felt that the communication skills programs were helpful to their clinical activities, this study failed to find objective evidence of any effect of the programs on the CPX results. Communication skills training should be continued during clinical clerkship to maintain or enhance the skills, and it is necessary to introduce more effective methods for precise evaluation of students' communication skills.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.10 no.2
• /
• pp.7-12
• /
• 2010

In this paper, we analyze and simulate the performance of a cooperative communication system adopting a maximum likelihood (ML) equalizer. In wireless communication systems, cooperative communication schemes employing several relays can be applied for extending the communication coverage. It is assumed that both relays and user terminals can move. Therefore, coverages of two or more relays can overlap each other. If wanted and interfering signals are transmitted through the same channel and there are one terminal in the overlapped region, its performance is degraded due to interference. Hence, we use a ML equalizer for rejecting the effect of interfering signal and enhancing the communication system performance. The cooperative system performance is evaluated in terms of bit error probability. From the simulation results, it is demonstrated that the ML receiver shows good interference cancellation performance although its complexity is high.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.41 no.3
• /
• pp.365-370
• /
• 2016

Recently, There are increasing number of studies that apply multi-carrier method, a land mobile communication method, to underwater channel environment in order to enhance the performance of underwater communication. Therefore, in this paper, in order to design a new system with improved communication performance compared to the multi-carrier method in underwater communication, we present that the RS(Resource Spreading) FMT-OFDM system has a diversity and repetition effect from resource spreading. Moreover, we verify the performance of RS FMT-OFDM system and existing FMT-OFDM system through simulations after modeling communication channels and setting the system parameter based on the data measured from the real sea. Our result indicate that, compared to the existing FMT-OFDM system, there has been an improvement in communication performance by 12dB based on BER $10^{-3}$ we also discovered that communication performance improves as the resource spreading rate increases.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.24 no.1
• /
• pp.130-133
• /
• 2020

Smart pig farm which is based on IoT has been widely adopted by many pig farmers. In order to achieve optimal control of smart pig farm, the relation between environmental conditions and performance metric should be characterized. In this study, the relation between multiple environmental conditions including temperature, humidity and various performance metrics, which are daily gain, feed intake, and MSY, is analyzed based on data obtained from 55 real pig farm. Especially, based on preprocessing of data, various regression based machine learning algorithms are considered. Through performance evaluation, we show that the performance can be predicted with high precision, which can improve the efficiency of management.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.38A no.8
• /
• pp.638-643
• /
• 2013

Chaos communication system has a sensitive characteristic to initial conditions, because completely another signal is generated when initial condition of chaos equation is changed subtly. Also, chaos communication systems have the characteristics of non-periodic, non-predictability, the broadband signal, such as ease of implementation. Due to these characteristics, security of chaos communication system generally is evaluated better than other systems. However, BER(Bit Error Rate) performance is evaluated worse than other digital system, because existing chaos communication system's transmitter and receiver are strong influence by interference signal and noise. So, research to improve the BER performance of the chaotic communication system is performed continuously. In this paper, We will propose a new CDSK(Correlation Delay Shift Keying) receiver for BER performance improvement. After we compare to the performance of existing CDSK receiver and proposed CDSK receiver, BER performance of proposed CDSK receiver evaluate. Also, when using the new CDSK receiver, we evaluate the BER performance according to the spreading factors and find an optimum spreading factor. If chaos communication system use a new CDSK receiver, BER performance is improved than existing CDSK receiver. Also, if spreading factor's value is increased, BER performance is improved, because it is not nearly affected by interference signal and noise.

• Journal of the Korea Society for Simulation
• /
• v.6 no.2
• /
• pp.71-79
• /
• 1997

In this paper, operations system was designed for the centralization of data processing of various state information from the facilities of mobile communication network. And the system performance experimental system module was measured and analyzed from the designed experimental system module. The configuration of system design was presented with the centralized type to monite and control the facilities of mobile communication network in the central office. The communication process design of the internal system was implemented with the resource of message queue having a excellent transmission ability for processing of a great quantity of information in the inter-process communication among communication resources of UNIX system. The process with a server function from the internal communication processes was constructed with a single server or a double server according to the quantity of operations and implemented with the policy of the presented server. And then, we have measured performance elements in accordance with the change of input parameters from the designed experimental module : response time, waiting time, buffer length, the maximum quantity existing in message queue. And from these results, we have compared and analyzed the system state each server algorithm according to performance variations.

• Journal of Information Technology Services
• /
• v.7 no.4
• /
• pp.301-317
• /
• 2008

Product-related services in manufacturing industry are different from typical services in service industry. Product-related services ensure proper product functioning, provide additional repurchase, and offer attractive margin Product-related services in manufacturing industry are not core activity but taking supporting roles, while services in typical service industry are core parts. The purpose of this study is to investigate the role of communication in linking IT and product-related logistics service in manufacturing industry. The relationships among IT, communication, logistics service and business performance are explored using a path analysis. The empirical research reveals that higher degree of IT usability leads to increased communication, and in turn, communication affects logistics service, and ultimately business performance. In addition, this study shows communication plays an intermediate role in linking IT to logistics service.

• Journal of Integrative Natural Science
• /
• v.14 no.2
• /
• pp.50-56
• /
• 2021

Due to the recent increase in the mobile streaming market, mobile traffic is increasing exponentially. IMT-2020, named as the next generation mobile communication standard by ITU, is called the 5th generation mobile communication (5G), and is a technology that satisfies the data traffic capacity, low latency, high energy efficiency, and economic efficiency compared to the existing LTE (Long Term Evolution) system. 5G implements this technology by utilizing a high frequency band, but there is a problem of path loss due to the use of a high frequency band, which is greatly affected by system performance. In this paper, small cell technology was presented as a solution to the high frequency utilization of 5G mobile communication system, and furthermore, the system performance was improved by applying machine learning technology to macro communication and small cell communication method decision. It was found that the system performance was improved due to the technical application and the application of machine learning techniques.