• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.9 no.10
• /
• pp.4034-4053
• /
• 2015

In order to meet various requirements for transmission quality of both primary users (PUs) and secondary users (SUs) in cognitive radio networks, we introduce a channel bonding mechanism for PUs and a channel reservation mechanism for SUs, then we propose a novel spectrum allocation strategy. Taking into account the mistake detection and false alarm due to imperfect channel sensing, we establish a three-dimensional Markov chain to model the stochastic process of the proposed strategy. Using the method of matrix geometric solution, we derive the performance measures in terms of interference rate of PU packets, average delay and throughput of SU packets. Moreover, we investigate the influence of the number of the reserved (resp. licensed) channels on the system performance with numerical experiments. Finally, to optimize the proposed strategy socially, we provide a charging policy for SU packets.

• International Commerce and Information Review
• /
• v.10 no.4
• /
• pp.171-199
• /
• 2008

The purpose of this study is to find out current problems facing the commodity trust of e-marketplace and export channel and product adaptation strategy in e-trade. This study will be an important benchmark to shed the light on understanding export channel and the localization adaptation strategy. The business performance of export corporations in Korea so that they will be able to build their own winning marketing adaptation strategy. This study will also obviously provide Korean export corporations having invested in foreign countries with the solid base to set up their marketing channel and localization adaptation strategy to compete with other export corporations abroad.

• Journal of the Korean Society of Costume
• /
• v.67 no.1
• /
• pp.40-55
• /
• 2017

The current new distribution environment provides the consumers to shop at anytime and any places by using mobile appliances. So, the companies which run the offline-store increase the contact point with the consumer by launching not only online-store but also the mobile application (app). Moreover, they are trying to operate the Omni-channel shopping environment. In order for this research to draw the direction of 'the Omni-Channel Strategy', which is about the changed distribution environment of the domestic fashion enterprise, the following steps were performed. First of all, the term related to 'Omni-Channel' is defined. And then, Example of the 'Omni-Channel' strategy and 'O2O' business in the domestic distributior were researched. Lastly, present condition of the 'Omni-Channel' strategy case of the domestic fashion industry was researched. At the result, the online-stores usually have several brands which can not represent their identities. It is suggested that each online-store according to each brand has their own characteristic identity. And The Omni-Channel strategy of the domestic fashion enterprise that is needed the connection point connecting the on-line and off-line. It is able to allure the customer to the off-line-store.

• Journal of the Korean Operations Research and Management Science Society
• /
• v.34 no.4
• /
• pp.185-204
• /
• 2009

The USIM(universal subscriber identity module)-unlock introducing in July 1, 2008 might be led to a significant change that mobile service provider's dominance is considerably dispersed to the handset manufacturer and distributor. Under USIM-unlock environment, mobile service provider, handset manufacturer, and distributor have to make their decisions on their handset distribution channel strategies: the closed distribution channel strategy or the open distribution channel strategy. The change of distribution channel strategy between members in distribution channel can be understood as a matter of strategy choice, and we have developed a theoretical model and analyzed how to make a decision for the member's optimal distribution strategy based on 3-person game model between members of mobile phone distribution channel, under both of '1 subscriber-1 handset' and '1 subscriber-multiple handset' assumptions. Under '1 subscriber-1 handset' assumption, the closed strategy controlled by mobile service provider is all players' optimal solution because the maximum size of the mobile phone market is limited by subscribers. But, as total expected profit by the handset and distribution subsides is a deficit, mobile service provider have to choose the open strategy and consider the conversion to MNO(mobile network operator). Under '1 subscriber-multiple handset' assumption, mobile service provider is trying to find the way how to lock-in its service and mobile phone and how to maximize ARPU(average revenue per unit), while handset manufacturer and distributor have to look for the way how to maximize the mobile phone market using their own marketing efforts, because it is expected that total mobile handset demand for the open market is bigger than demand for the closed market under '1 subscriber-multiple handset' assumption.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.41 no.3
• /
• pp.393-406
• /
• 2017

A "Showrooming" phenomenon has emerged due to the rapid growth of the on-line shopping market and is associated with consumer shopping patterns. This phenomenon is resulted in new strategies such as the Omni-Channel strategy that are now being employed by the off-line retail industry to meet the needs of consumers who seek information on-line. In particular, human services provided in department stores (which still occupy an important place in the off-line retail industry) are reaching limitations in the ability to maintain consumers. This study provides basic data for the Omni-Channel strategy of domestic department stores by researching and analyzing Omni-Channel strategy cases in Manhattan. This study dissects and analyzes the "Showrooming" phenomenon and the development of the Omni-Channel strategy through a literature review as well as analyzes the Omni-Channel success case of Macy's department store. The findings indicate that the use of the Omni-Channel strategy by Macy's department store has solved the problem of "Showrooming," by integrating on-line and off-line shopping to provide an efficient and convenient shopping experience for consumers. The Omni-Channel strategy offers a means for off-line stores to connect to the online shopping behavior of consumers. The results suggest the need for an organic combination of on-line and off-line distribution channels to adapt to changes in consumer shopping patterns due to a recession in the domestic market.

• Journal of Communications and Networks
• /
• v.16 no.2
• /
• pp.217-226
• /
• 2014

In this research, we study the problem of opportunistic spectrum access (OSA) in a time-varying environment with fading channels, where the channel state is characterized by both channel quality and the occupancy of primary users (PUs). First, a finite-state Markov channel model is introduced to represent a fading channel. Second, by probing channel quality and exploring the activities of PUs jointly, a two-dimensional partially observable Markov decision process framework is proposed for OSA. In addition, a greedy strategy is designed, where a secondary user selects a channel that has the best-expected data transmission rate to maximize the instantaneous reward in the current slot. Compared with the optimal strategy that considers future reward, the greedy strategy brings low complexity and relatively ideal performance. Meanwhile, the spectrum sensing error that causes the collision between a PU and a secondary user (SU) is also discussed. Furthermore, we analyze the multiuser situation in which the proposed single-user strategy is adopted by every SU compared with the previous one. By observing the simulation results, the proposed strategy attains a larger throughput than the previous works under various parameter configurations.

• Fashion & Textile Research Journal
• /
• v.17 no.6
• /
• pp.919-931
• /
• 2015

Recently, with the rapid development of the Internet, the importance of the multi-channel retailing strategy including online channel has been emphasized in fashion business. The purpose of this research is to give some practical ideas of multichannel strategy for fashion retailers through comparison for multichannel choice behaviors between Korean and US consumers. The online survey was conducted on the 400 fashion customers aged between 20s and 50s living in Korea and America. The survey consisted of measurement items about channel choice behaviors for purchase or information search, risk perception on channel, repurchase intention at same channel, perception on experience or search goods among apparel items. The data were analyzed by frequency, regression, t-test using SPSS 18.0 program. The ratio of utilization multichannel was higher in fashion goods area in Korea fashion business. Also, most of Top-ranked fashion or accessory retailers in America were taking advantage of multichannel strategy. There were some differences between Korea and US consumers in channel choice behaviors for purchase or information search, risk perception for retail channel, repurchase intention at same channel, perception on experience or search goods among apparel items, etc. Some suggestion for the future research for multichannel strategy in fashion retailing was given.

• Journal of the Korea Safety Management & Science
• /
• v.19 no.2
• /
• pp.173-180
• /
• 2017

Omni-channel strategy is an innovative paradigm for integrated information distribution of inventory, sales, operations, marketing, delivery, pickups and returns in supply chain management. Recently the distribution strategy faces new challenges with the advent of mobile distribution channels. Social media with countless apps imposes additional stress on supply chain operations. Due to these changes, distribution network in supply chain is changing naturally and rapidly from multi-channel to omnni-channel platform. Recently numerous domestic distributors establish and adapt this new supply chain optimization tool as a part of seamless flow of movements of goods from one channel to other channels. The objective of this paper is to present a preliminary findings on how omnni-channel affects the supply chain management. A survey is used to ascertain in the degree of omnni-channel implementation and statistical evidence is provided to test sets of hypothesis. The results of the questionnaire showed that consumers' purchasing styles differed by gender, age, purchase purpose, and product type. In particular, women consider purchasing experience in omni-channel to be important. As food and household goods can be conveniently shipped, consumers prefer online purchasing it. Conversely, consumers tend to favor omni-channel strategy in connection with offline experience in IT products.

• Journal of Distribution Research
• /
• v.9 no.2
• /
• pp.29-43
• /
• 2004

This research analyzed multi-channel strategy from the viewpoint of the customer relationship management. We hypothesized that the purchase frequency, monetary, purchase quantity of the existing customers should have increased after they used multiple channels of a company for shopping, All the hypothesis were supported in an empirical test using the customer database of a Korean TV home-shopping company, The result showed that the multi-channel strategy can be used to increase the life-time value of existing customers. Still there were a lot of customers who insists using traditional channel, which calls for a new strategy inducing them to use multi- channel for shopping.

• Proceedings of the IEEK Conference
• /
• 1998.10a
• /
• pp.127-130
• /
• 1998

Wireless multimedia networks require channel allocation strategies for various multimedia traffic since the mobility of users needs to be considered in addition to diversity of QoS requirements of multimedia traffic. In this paper, we propose an Efficient Channel Allocation strategy, based on prioritization of handoff calls used in Guard channel method. Gurad channels can be shared between non real time calls and real time handoff calls. To decrease the probability of handoff failure, when resources become scarce, the Call Admission Control can take some resources away from the active calls. It is shown through extensive simulations that the proposed strategy provides higher channel utilization and lower probability of handoff failure than existing strategies.