TO-DCF, a new backoff scheme for 802.11, has the potential to significantly increase throughput in dense wireless LANs while also opportunistically favouring nodes with heavier traffic loads and/or better channel conditions. In this paper we present an analytical model to investigate the behaviour and performance of the TO-DCF protocol with regards to operating parameters such as the number of ...

Recently, Wireless Local Area Networks (WLANS) has become one of the most popular standards for wireless Internet access technology. IEEE 802.11 WLAN standard supports two kinds of access methods: DCF (Distributed Coordination Function) and PCF (Point Coordination Function).In this paper, DCF & PCF modes were used to manage internet sharing tasks. The characteristics obtained from bandwidth-del...

The atomic layer deposition (ALD) technology is introduced to enhance the sensitivity of optical fiber cladding mode to surrounding refractive index (SRI) variation. The highly uniform Al2O nanofilm was deposited around the double cladding fiber (DCF) which presents cladding mode resonant feature. With the high refractive index coating, the cladding mode resonant spectrum was tuned. And the sen...

The flexibility of wireless connectivity is appealing in the context of real-time industrial networks. This paper discusses the use of wireless communication protocols to interconnect remotely located fieldbuses. The focus of this paper is to analyze the feasibility and design issues related to this type of hybrid real-time network architecture. Investigations are presented by addressing an int...

A natural, ferruginous material, Hormuz Red Soil (HRS), was used as a catalyst for decontamination and disinfection via PMS activation. The HRS fully characterized (morphological, structural, chemical properties) mainly comprised of ?-Fe2O3. Complete degradation 88.6% mineralization Diclofenac (DCF) achieved in the HRS/PMS process (10 mg/L HRS, 75 PMS) within 8 min at neutral pH, while sulfate ...

In this paper, we have analyzed the performance of WDM Ethernet Passive Optical Network (EPON) with Radio over Fiber (RoF) optical link with the use of Dispersion compensating fiber at the transmission section. Performance of the system is improved with the use of DCF. The results are compared with and without DCF. The BER, Q factor and eye diagrams have been used for evaluating the performance...

This paper studies the effect of photosensitizer (acetone, H(2)O(2), surfactant and pigment) on photodegradation of diclofenac (DCF) under simulated sunlight. The results demonstrate that degradation pathways proceed via pseudo first-order kinetics in all cases. The photodegradation rate was found to increase with increasing acetone and H(2)O(2). Surfactant and pigment inhibited the photodegrad...