EBDP BUFFER SIZING STRATEGY 802.11 BASED WLANS

In this paper we present wired routers, for whom the sizing of buffers is an active research topic. The classical rule of thumb for sizing wired buffers is to set buffer sizes to be the product of the bandwidth and the average delay of the flows utilizing this link, namely the Bandwidth-Delay Product (BDP) rule. Surprisingly, however the sizing of buffers in wireless networks (especially those based on 802.11/802.11e) appears to have received very little attention within the networking community. Exceptions include the recent work in relating to buffer sizing for voice traffic in 802.11e WLANs, work in which considers the impact of buffer sizing on TCP upload/download fairness, and work in which is related to 802.11e parameter settings

Heavy landings of bigeye and pinjalo snappers at Chennai Fisheries Harbour

Among the major perches landed at Chennai Fisheries Harbour, snappers and rock cods formed dominant groups followed by pigface breams. Among snappers, more than 15 species were recorded at Chennai Fisheries Harbour during 2009 (Table 1). In trawlnet, Lutjanus lutjanus (29.9%) formed the dominant catch followed by L. rivulatus and L. malabaricus. In mechanised gillnet, L. rivulatus (33.7%) formed the major catch followed by L. malabaricus and Pinjalo pinjalo. In hooks and line, L. rivulatus (34.4%) formed the major catch followed by L. lutjanus, L. malabaricus and L. argentimaculatus. The other lutjanids landed were Aphareus rutilans, Aprion virescens and Pristipomoides filamentosus. Lutjanus lutjanus was landed throughout the year by trawl nets. Unusually heavy catch of big eye snapper (L. lutjanus) was landed, about 8.5 t, 3.2 t, and 2 t by multiday thangal trawlers during July, August and September, 2009, respectivel

Note on catfish landing with gravid females, male brooders and young ones at Cuddalore, Tamil Nadu

In Tamil Nadu catfish is landed mainly as a by-catch in trawlers, drift gill netters and the hook and line units. In 2018, the total catfish landing in Tamil Nadu was 4165 t of which almost 90 % was contributed by trawlers. On 22.8.2019, around 3000 kg of catfish, Arius maculatus was landed by a ring seiner at Cuddalore, Tamil Nadu. The catch was comprised of gravid females and incubating males of total length ranging from 350 mm to 370 mm. Along with the catch, eggs in various stages of development, juveniles with yolk and without yolk were also seen in good quantity in the boat. One gravid ovary contained 24 eggs in the right ovary and 29 in the left

Pantoprazole induced black hairy tongue: a case report

Black hairy tongue (BHT) is characterized by abnormally hypertrophied and elongated filiform papillae, appearing as blackish discoloration on the dorsal surface of the tongue. BHT has been reported as an adverse drug reaction to different categories of drugs. However, pantoprazole induced BHT has been rarely reported. We present the case of a 42-year-old female, admitted in the surgery ward with postoperative wound infection, for which she was prescribed oral clarithromycin and pantoprazole. On the third day of starting medications, she complained of blackish discoloration on the dorsal surface of the tongue with an alteration of taste sensation, which was clinically and microscopically diagnosed as BHT. Suspecting BHT as an adverse drug reaction to pantoprazole, it was stopped, while clarithromycin was continued for the full course. She was also advised to scrape her tongue thrice daily, drink adequate fluids and maintain good oral hygiene. On the third day after stopping pantoprazole, black discoloration and alteration of taste sensation resolved completely. WHO-UMC causality assessment scale showed a ‘probable’ association of the adverse drug reaction with pantoprazole. Physicians should be aware of the possibility of BHT with the use of pantoprazole and that it completely resolves on stoppage of the drug, mechanical debridement and good oral hygiene

Installation of fishing net tracking buoys in deep sea multiday tuna drift gillnetters at Chennai

The deep sea multiday tuna drift gillnetters face many risks while they engage in fishing. The cutting and stealing of nets by fishermen of other boats or damage of the nets by the ships is common. As the total length of a net when set is around 5 to 6 nautical miles (nmi) and the fishing is carried out during night, quite often the fishermen come to know about the loss only at the time of hauling the net. Another serious issue is the possibility of collision with an approaching ship as sometimes the fishing ground can be on the same track of a ship and fishermen notice it only when the ship is too near to them. Installation of fishing net tracking buoy can effectively avoid these risks and enable a hassle free fishing trip

A Study on “Security of Cyber-Physical Systems in the Cloud”

The existing security models are built with certain assumptions. The solutions like distributed accountability, provable data possession (PDP), Third Party Auditing (TPA) and so on are secure as long as the assumptions hold true. To ensure fool proof security for cloud storage security little research has been made on quantum key cryptography. Since the quantum key distribution is unconditionally secure, we propose a new scheme known as Cloud QKDP (Quantum Key Distribution Protocol for Cloud Computing) which exploits the benefits of quantum mechanisms to secure cloud storage and data dynamics. We consider a case study in which three parties such as cloud server, data owner and trusted client have provably secure communications with our proposed scheme which uses random oracle model. Our empirical study revealed mixture of success and failure rates with private and public clouds respectively

Heavy landing of tomato hind Cephalopholis sonnerati (Valenciennes, 1828) at Chennai

Heavy landing of the tomato hind, Cephalopholis sonnerati (Valenciennes, 1828), locally called ‘thakkali kalava’ or ‘sivappu kalava’ (Fig.1), was recorded at Chennai Kasimedu Fisheries Harbour in July 2008 and August 2009

Unusual heavy landing of billfishes at Chennai

Billfishes are regularly landed by mechanised gillnets and hooks and line at Chennai Fisheries Harbour. An estimated catch of 65 t, 80 t, and 60 t of billfishes were landed by mechanised gillnets during July, August and September 2010 respectively. On 24.06.2010, about 5 t of billfishes were landed unusually by mechanised gillnets operated at a depth of 50-60 m in the north-east direction

Analysis of Box Culvert to Reduce Stress Values

At the time of construction of roads, highways a structure is placed (commonly used) to transfer the traffic, rain water, drainage from one side to another of the road is called a culvert placed beneath the road. Due to the structural use, multiple loads are placed on the box causing various types of stress which occurs on it. The paper tries to reduce the stress occurred in the box by flaring the box partially

Comparison of methods for evaluating the suitability of Vertisols for Gossypium hirsutum (Bt cotton) in two contrasting agro-ecological regions

This is the author accepted manuscript. The final version is available from Taylor and Francis (Routledge) via the DOI in this record.Cotton (Gossypium sp.) is a major crop grown under rainfed conditions in Vertisols and associated soils in semi-arid tropical (SAT) regions of Peninsular India. In recent years, cotton productivity has declined due to various biophysical factors including pest and diseases, seasonal water stress soil degradation and poor crop management practices. In this study, we compare two methods for evaluating the suitability of Vertisols for cotton in contrasting two agro-ecological regions viz., sub-humid moist (SHM) region and semi-arid dry(SAD) were characterized. Twelve cotton growing Vertisols (seven from SHM and five from SAD) were evaluated for their suitability for cotton cultivation using soil quality index (SQI) and modified Sys-FAO method. SQIs were calculated using the weighted additive index from transformed scores of selected indicators by principal component analysis. For Sys-FAO method both biophysical and soil characteristics were considered for suitability evaluation. We found that the soils of SHM region were moderately suitable for cotton cultivation with soil moisture as the major limiting factor, whereas the soils of SAD region are marginally suitable due to high exchangeable sodium percentage and poor hydraulic conductivity. From this, it may be concluded that the weighted SQI has better agreement with the cotton yield