Jaeok Park

Peer-to-peer (P2P) networks can be easily deployed to distribute user-generated content at a low cost, but the free-rider problem hinders the efficient utilization of P2P networks. Using game theory, we investigate incentive schemes to overcome the free-rider problem in content production and sharing. We build a basic model and obtain two benchmark outcomes: 1) the non-cooperative outcome without any incentive scheme and 2) the cooperative outcome. We then propose and examine three incentive sch

Interactions among selfish users sharing a common transmission channel can be modeled as a non-cooperative game using the game theory framework. When selfish users choose their transmission probabilities independently without any coordination mechanism, Nash equilibria usually result in a network collapse. We propose a methodology that transforms the non-cooperative game into a Stackelberg game. Stackelberg equilibria of the Stackelberg game can overcome the deficiency of the Nash equilibria of

This paper develops a game-theoretic framework for the design and analysis of a new class of incentive schemes called intervention schemes. We formulate intervention games, propose a solution concept of intervention equilibrium, and prove its existence in a finite intervention game. We apply our framework to resource sharing scenarios in wireless communications, whose non-cooperative outcomes without intervention yield suboptimal performance. We derive analytical results and analyze illustrative

Peer-to-peer (P2P) networks offer a cost effective and easily deployable framework for sharing user-generated content. However, intrinsic incentive problems reside in P2P networks as the transfer of content incurs costs both to uploaders and to downloaders while the benefit accrues only to downloaders. We investigate the issues of incentives in content production and sharing over P2P networks using a game theoretic model. Peers do not share produced content at all at non-cooperative equilibria w

The main challenges of cognitive radio include spectrum sensing at the physical (PHY) layer to detect the activity of primary users and spectrum sharing at the medium access control (MAC) layer to coordinate access among coexisting secondary users. In this paper, we consider a cognitive radio network in which a primary user shares a channel with secondary users that cannot distinguish the signals of the primary user from those of a secondary user. We propose a class of distributed cognitive MAC

Many existing medium access control (MAC) protocols utilize past information (e.g., the results of transmission attempts) to adjust the transmission parameters of users. This paper provides a general framework to express and evaluate distributed MAC protocols utilizing a finite length of memory for a given form of feedback information. We define protocols with memory in the context of a slotted random access network with saturated arrivals. We introduce two performance metrics, throughput and av

Overcoming the inefficiency of non-cooperative out-comes poses an important challenge for network managers in achieving efficient utilization of network resources. This paper studies a class of incentive schemes based on intervention, which are aimed to drive self-interested users towards a system objective. A manager can implement an intervention scheme by introducing in the network an intervention device that is able to monitor the actions of users and to take an action that influences the net

The purpose of this study was to identify the difference on the consumer's cognitive response, emotional and behavioral response in regard of the in-store shopping environment according to their apparel shopping orientation. The subjects of this study were consumers who finished shopping in the stores, and 300 questionnaires were completed. Data collected in this survey were analyzed by using Factor analysis, Cluster analysis, one-way ANOVA and Duncan test as a post identification. The results w

The purpose of this study was to clarify differences in consumer's advertising attitude related to type of mobile fashion advertising and level of apparel and advertising involvement groups. This study surveyed consumers who have an experience of receiving mobile fashion advertising. The subjects of this study were men and women aged 10-20 years of age, living in the metropolitan area and judgments sampling was employed. The data were obtained from 480 questionnaires. The measurement instruments

I present a model of international trade with cultural barriers and cultural learning. There are two countries that can produce a manufacturing good and cultural goods and can trade with each other. Due to cultural difference, consumers in a country have difficulty in appreciating cultural goods produced in the other country, which creates cultural barriers, and consumers can overcome these barriers by investing in cultural learning. I first study trade equilibrium given cultural barriers in the

사업장에서의 중대산업재해를 줄이기 위해서 사업주 및 경영책임자의 책임과 처벌을 강화해야 한다는 주장이 있으며, 이러한 주장에 따라 중대재해 처벌 등에 관한법률 (약칭: 중대재해처벌법)이 제정되어 시행되고 있다. 본 논문은 게임이론적 분석을 통해 단순히 사업주와 경영책임자의 책임을 강화하는 것만으로는 사고가 줄어든다는 보장이 없다는 것을 보이며 중대재해처벌법의 시행이 사고 발생 및 사회적후생에 미치는 영향을 분석하기 위해서는 사업주와 경영책임자의 근로자에 대한 통제력이 함께 고려되어야 한다는 것을 지적한다.