Spectrum is a valuable, scarce and finite natural resource that is needed for many different applications, so efficient use of the scarce radio spectrum is important for accommodating the rapid growth of wireless communications. Spectrum auctions are one of the best-known market-based solutions to improve the efficiency of spectrum use. However, Spectrum auctions are fundamentally differen...

The present study aims to provide a model for financing buyer-supplier in Mehrvarzan healthcare Company. The statistical population of the study includes 300 employees of the company. According to Morgan table, 168 people are selected as the statistical sample. Available non-random sampling method has been used. For collecting the required information, the standard buyer-supplier financing ques...

    inventory model,   backorder   buyer ,   vendor,   lot for lot policy In this paper, an inventory model for two-stage supply chain is investigated. A supply chain with single vendor and single buyer is considered. We assume that shortage as a backorder is allowed for the buyer and the vendor makes the production set up every time the buyer places an order and supplies on a lot for lot basis...

The aim of this paper is the evaluation overall performance of buyer-supplier relationships.In some situations the cost of inputs in a buyer-supplier chain are available, on the other hand, achieving a low cost position is necessary for most businesses. And, in a buyer-supplier chain wants to know how assign inputs with the least cost. This paper introduces cost efficiency with same and dierent...

This paper presents a set of mechanisms oriented to incorporate social information into the decision taking of task-oriented 3DIVA. The aim of this approach is to integrate collaborative skills in different character’s roles (seller/buyer, worker, pedestrian, etc.) in order to enhance its behavioral animation. The collective intelligence expected in this kind of multi-character domains (e.g. st...

Buyer-seller watermarking are protocols guaranteeing the buyer prevents false infringement accusations and the seller protects the watermark secrets from the buyer. Most recently, Chang et al. proposed an efficient and fair buyer-seller watermarking scheme for large scale networks quite recently. In this correspondence, we first shows its three weaknesses: the buyer can easily remove the waterm...