• Journal of Communications and Networks
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• v.17 no.4
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• pp.440-448
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• 2015

In this paper, we study the problem of selfish behavior of secondary users (SUs) based on cognitive radio (CR) with the presence of primary users (PUs). SUs are assumed to contend on a channel using the carrier sense multiple access with collision avoidance (CSMA/CA) and PUs do not consider transmission of SUs, where CSMA/CA protocols rely on the random deference of packets. SUs are vulnerable to selfish attacks by which selfish users could pick short random deference to obtain a larger share of the available bandwidth at the expense of other SUs. In this paper, game theory is used to study the systematic cheating of SUs in the presence of PUs in multichannel CR networks. We study two cases: A single cheater and multiple cheaters acting without any restraint. We identify the Pareto-optimal point of operation of a network with multiple cheaters and also derive the Nash equilibrium of the network. We use cooperative game theory to drive the Pareto optimality of selfish SUs without interfering with the activity of PUs. We show the influence of the activity of PUs in the equilibrium of the whole network.

• The Journal of Asian Finance, Economics and Business
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• v.5 no.4
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• pp.149-160
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• 2018

An alternative method for team diversity studies is to examine demographic faultlines. A concept of demographic faultline enables us to better understand team dynamics with multidimensional diversity. This study suggests the demographic faultline as a new situational factorto influence the relationship between leader teamwork behaviors and a climate of support for innovation. When subgroups divided by demographic faultline are homogeneous within them and heterogeneous between them, the homogeneity may increase intimacy in each subgroup while the heterogeneity may increase exclusiveness between those subgroups. We argued that a leader could play an important role to build a cooperative relationship between faultline-based subgroups and highlight positive aspects of developing and maintaining subgroups in organizations. With a sample of 81 teams (558 employees), it was examined how leader teamwork behaviors would affect a team-level climate of support for innovation and how this relationship would be moderated by each team's demographic faultline (gender, age, and educational specialty). As predicted, it was found that there was a significant positive relationship between each leader's teamwork behaviors and each team's climate of support for innovation. In addition, this relationship was stronger for teams with strong faultline than with weak faultline. Our findings and their implications were further discussed.

• Journal of Internet Computing and Services
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• v.15 no.4
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• pp.103-110
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• 2014

In study we analyze the network about the legislators in Korean National Assembly. We focused on 17th National Assembly since there were full of important changes in composition. Mutual cooperation is necessary to pass the bills beyond their given mission in legislation. In order to find out the relationship of legislators based on the introducing bills, total 5728 bills in 17th National Assembly, we used bipartite network projection. We can find who is a highly influential legislator and the difference between a ruling party and a main opposition party in aspects of cooperative behavior.

• Journal of the Korean Home Economics Association
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• v.19 no.2
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• pp.89-105
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• 1981

The aim of this study is to analyze the attitude of family economic management in urban and rural household and how it effect to each household. It was investigated the attitude of housewife for the family economy planning purchase, consumption and utilization of the resources by questionnaire. For the analysis, usable respones(410 from urban and 264 from rural housewife) were verified. The result of investigation if as follows ; 1. the housewives in urban and rural have attitude of purposal purchase in general. the information for the new products and prices are usually got6 by mass media. the urban wives keep records more than rural housewives. 2. They have reasonable behavior in purchase but when they select the goods, urban housewives prefer to the goods made by well-known company and rural housewives consider the prices. Otherwise the rural housewives take more the cooperative buying than urban housewives. 3. In urban they save some money regularly but in rural they can rarely save. the housewife manages all money for living expenses in urban, but in rural they do not so. 4. Human resources and nonhuman resorces are utilized in rural house better than the urban but especially household equipments are not used completely in both case.

• Journal of Drive and Control
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• v.9 no.4
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• pp.8-13
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• 2012

Recently, researches about the eco-friendly vehicles such as hybrid electric vehicle, fuel cell vehicle and electric vehicle have been actively carried out. The regenerative braking system is a key technology to improve the vehicle energy utilization efficiency because it transforms the kinetic energy to the electric energy through the electric motor. This new braking system requires cooperative control between electric controlled brake and regenerative brake. Therefore, it is necessary to establish fault-diagnosis and fail-safe evaluation criteria to secure reliability of the regenerative braking system. In this paper, the failure types and causes in regenerative braking system were analyzed. The transient behavior characteristics were examined based on fault-diagnosis and fail-safe upon failure of regenerative braking system.

• Proceedings of the IEEK Conference
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• summer
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• pp.421-426
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• 2004

Analyzing adaptive possibilities of agents in multi-agents system, we have discovered new aspects of ambient intelligence in distributed modular systems using intelligent building blocks (I-BLOCKS) [1]. This paper describes early scientific researches related to technical design, applicable experiments and evaluation of adaptive processing and information interaction among I-BLOCKS allowing users to easily develop ambient intelligence applications. The processing technology presented in this paper is embedded inside each DUPLO1 brick by microprocessor as well as selected sensors and actuators in addition. Behaviors of an I-BLOCKS modular structure are defined by the internal processing functionality of each I-Blocks in such structure and communication capacities between I-BLOCKS. Users of the I-BLOCKS system can do 'programming by building' and thereby create specific functionalities of a modular structure of intelligent artefacts without the need to learn and use traditional programming language. From investigating different effects of modem artificial intelligence, I-BLOCKS we have developed might possibly contain potential possibilities for developing applications in ambient intelligence (AmI) environments. To illustrate these possibilities, the paper presents a range of different experimental scenarios in which I-BLOCKS have been used to set-up reconfigurable modular systems. The paper also reports briefly about earlier experiments of I-BLOCKS in different research fields, allowing users to construct AmI applications by a just defined concept of modular artefacts [3].

• Journal of Korean Public Health Nursing
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• v.25 no.2
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• pp.209-220
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• 2011

Purpose: The study investigated the level of mutual cooperation among those engaged in public and private nursing and social welfare to understand contributing factors. Method: The subjects were 289 nurses and 279 social workers. The level of mutual cooperation between nurses and social workers was evaluated. taking into account related personal factors and organizational environmental factors. Results: The level of mutual cooperation between nursing and social welfare organizations showed the following sequence, in decreasing order; public nursing, public social welfare, private nursing and private social welfare personnel. The factors affecting nurses' cooperation with social welfare personnel were expected duties, understanding of social workers' service, service autonomy, service appropriateness, and the training environment of the organization. Factors influencing the level of cooperation of social workers with nurses included understanding of nursing service, understanding of the efficiency gained by cooperation, service appropriateness and the training environment of the organization. Conclusion: The development of training programs to increase the level of cooperation between the nursing and social welfare fields is strongly recommended.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.499-502
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• 2018

We propose a wireless-powered multihop transmission scheme using inter-node cooperation in a linear network topology. The proposed protocol determines the energy transfer time for each node to make the lifetime of the each node be equal in order to maximize the lifetime of the multihop path. To make the lifetime of each node the same, we apply the flocking algorithm which imitates the behavior of a bird flock flying at the same velocity, so that the lifetime of the nodes is averaged locally. Simulation results show that the proposed algorithm can maximize the lifetime of the multihop path by making all nodes have the same lifetime.

• Journal of Construction Engineering and Project Management
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• v.3 no.1
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• pp.22-27
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• 2013

Inter-organizational Relationships (IORs) governance is one of the emerging research areas that have been studied in different contexts (e.g. economics, strategy, organization, and management). This view, particularly, attracted rising attention from academics and practitioners in the context of construction projects, due to the complex forms of IORs in terms of inter-firm exchanges (e.g. engineering, procurement, finance, construction, and operation) in these projects. The focus of IORs governance is to control Inter-organizational relationships among two or more cooperative parties to alleviate conflict and achieve mutual gains. One of the mechanisms that have been identified in the related literature is formal governance mechanism. Although many empirical studies have been conducted using formal governance terms and indicators, there isn't yet a consensual definition of this mechanism and its components that may cause misinterpretation of research results and also impede future research. This paper makes contribution to the concept of IORs governance by clarifying the meaning of formal governance mechanism and identifying different indicators of this mechanism that have been used and identified in previous studies. This provides an innovative and useful framework to understand formal governance mechanism and its application in construction projects.

• Korean Journal of Rural Living Science
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• v.6 no.1
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• pp.1-10
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• 1995

To lead rural clothing management in the rural household, we assessed in terms of the wearing of pesticide protective clothing and care methods of contaminated clothing, consumer consciousness, the discard method of clothing et al. in rural areas of Gyonggi-Do by sampling 122 households. The results are as following ; 1. The behavior for laundering management didn't appropriate in view of certification of label about laundry method, frequency of laundry and quantitative use of detergent. Also family's cooperative attitude wasn't insufficient. 2. Reasons of dissatisfaction about retained clothing were decreased in order of discoloration, shrink or breakage after laundry, breakage of seam or cloth, unlabel, allergy from cloth. The solution of trouble was acted passively. 3. Reasons of hoarding of clothing were high because of change on size, fashion, and low because of wornout. Still-wearable garments were discarded in proportion of one to one. 4. The ratio of putting on the fatigue cap which the Once of Rural Development has propagated was under 10 percent. 5. Protective clothes against agricultural chemicals had not been prepared and contaminated clothing was often washed with regular family wash.