In this study, we consider a single server vacation queueing model with optional bulk service and an un-reliable server. A single server provides first essential service (FES) to all arriving customers one by one; apart from essential service, he can also facilitate the additional phase of optional service (OS) in batches of fixed size b(≥ 1), in case when the customers request for it. The serv...

As one of the motivational theories which define both values and attitudes beyond personal as well as organizational benefits, Public Service Motivation (PSM) model aims to underscore the appreciation of individuals with regard to public interests. If PSM pattern being optional is synchronized with civic-organizational behavior, its effectiveness is manifested in improving service quality. The ...

The 802.11 specifications include services for link-level authentication and an optional privacy (i.e., confidentiality) service termed Wired Equivalent Privacy (WEP). WEP is designed to protect the confidentiality of link layer traffic (i.e., the wireless leg). The security parts of the standard provide no claims about secure integrity assurance, but it does require a frame check sequence (FCS...

This article describes the new concept of service oriented software architecture for mobile sensor networks. By the use of this architecture, a flexible, scalable programming of applications based on an adaptive middleware is possible. The middleware supports mechanisms for cooperative data mining, self-organization, networking, and energy optimization to build higher-level service structures. ...

The IEEE 802.15.4 standard features some optional services, including the Guaranteed Time Slot (GTS) mechanism. It provides network devices with collision-free access to the medium to assure Quality of Service. GTS suffers from a severe security vulnerability: an adversary can easily perform a Denial of Service attack by selectively jamming collision-free communications. We present Secure GTS, ...

This paper aims to investigate M[X]/(G1, G2)/1/VAC(J) queuing system with a random(p) vacation policy and optional second service, where X is the batch arrival number of customers. When no customers are in system, server immediately goes on vacation. And when returns from finds that at least one customer waiting will provide First Essential Service (FES). After complete first essential some con...