Wireless sensor networks (WSNs) are one of the important supporting technologies of edge computing. In WSNs, reliable communications are essential for most applications due to the unreliability of wireless links. In addition, network lifetime is also an important performance metric and needs to be considered in many WSN studies. In the paper, an energy-aware hybrid Automatic Repeat-reQuest prot...

Although the EDCA access mechanism of the 802.11e standard supports legacy DCF stations, the presence of DCF stations in the WLAN jeopardizes the provisioning of the service guarantees committed to the EDCA stations. The reason is that DCF stations compete with Contention Windows (CW ’s) that are predefined and cannot be modified, and as a result the impact of the DCF stations on the service re...

The Low-rate Denial of Service (LDoS) attack is a new type of DoS (Denial of Service) attack, which produces the similar harmful effect as the DoS attack. It is more difficult for existing DoS detection methods to detect the LDoS attacks because of their distinct characteristics, at the same time the accuracy of the current detection methods for the LDoS attacks is relatively low. However, when...

In wireless sensor networks, transmitting information from sensors to a far Access Point (AP) out of direct transmission range, might make the use of relaying crucial. The goal of this paper is to study the impact of relaying in Zigbee wireless sensor networks. In particular, we focus on Zigbee wireless sensor networks and analyze scenarios where the sensors transmit to an AP (or coordinator) (...

We consider end-to-end per-station and per-flow fair bandwidth allocations for TCP traffic in 802.11 based multiradio multi-hop networks. We first show that TCP ACK packets have to be prioritised using IEEE 802.11e since otherwise congestion losses of ACK packets cause unpredictable performance. We then prove that prioritising ACK packets alone and ignoring TCP data packets results in per-stati...

The present work proposes an experimental strategy to prepare argan nutshell-derived porous carbons using potassium hydroxide (KOH). Several parameters of the activation process were evaluated (temperature, impregnation ratio, and time), optimized carbon (ACK) was obtained. surface properties ACK sample determined, applied as adsorbent diclofenac (DCF) paroxetine (PARX). A commercial (CC) used ...

Network coding has attracted the attention of many researchers in security and cryptography. In this paper, a well know attack selective forwarding attack will be studied in network coding systems. While most of the works have been dedicated to the countermeasure against pollution attacks where an attacker modifies intermediate packets, only few works concern selective forwarding attacks on dat...

Acetate kinase (ACK) (EC no: 2.7.2.1) interconverts acetyl-phosphate and acetate to either catabolize or synthesize acetyl-CoA dependent on the metabolic requirement. Among all ACK entries available in UniProt, we found that around 45% are multiple ACKs in some organisms including more than 300 species but surprisingly, little work has been done to clarify whether this has any significance. In ...

We demonstrate the efficacy of double-stranded RNA-mediated interference (RNAi) of gene expression in generating "knock-out" phenotypes for specific proteins in several Drosophila cell lines. We prove the applicability of this technique for studying signaling cascades by dissecting the well-characterized insulin signal transduction pathway. Specifically, we demonstrate that inhibiting the expre...

This study aimed at the investigation of the mechanisms of acidogenesis, which is a key process during anaerobic digestion. To expose possible bottlenecks, specific activities of the key enzymes of acidification, such as acetate kinase (Ack, 0.23-0.99 U mg(-1) protein), butyrate kinase (Buk, < 0.03 U mg(-1) protein) and butyryl-CoA:acetate-CoA transferase (But, 3.24-7.64 U mg(-1) protein), were...