Less-than-Best-Effort capacity sharing over high BDP networks with LEDBAT

There has been a renewed interest at the Internet Engineering Task Force (IETF) in using Less-than-Best Effort (LBE) methods for background applications. IETF recently published a RFC for Low Extra Delay Background Transport (LEDBAT), a congestion control algorithm for LBE transmissions. This paper provides an analysis of LEDBAT performance over congested large bandwidth X delay product (LBDP) networks, and assesses the validity of having a fixed target queuing time. In particular, we lead a study of the impact of this target queuing delay when LEDBAT is used over 4G satellite networks. The rationale is to explore the possibility to grab the unused 4G satellite links' capacity to carry non-commercial traffic. We show that this is achievable with LEDBAT. However, depending on the fluctuation of the load, performance improvements could be obtained by properly setting the target value. We generalize this evaluation over different congested LBDP networks and confirm that the target value might need to be adjusted to networks' and traffic's characteristics. Further work will study whether and how this parameter should be dynamically adapted, and LEDBAT's congestion control improved

Endpoint-transparent Multipath Transport with Software-defined Networks

Multipath forwarding consists of using multiple paths simultaneously to transport data over the network. While most such techniques require endpoint modifications, we investigate how multipath forwarding can be done inside the network, transparently to endpoint hosts. With such a network-centric approach, packet reordering becomes a critical issue as it may cause critical performance degradation. We present a Software Defined Network architecture which automatically sets up multipath forwarding, including solutions for reordering and performance improvement, both at the sending side through multipath scheduling algorithms, and the receiver side, by resequencing out-of-order packets in a dedicated in-network buffer. We implemented a prototype with commonly available technology and evaluated it in both emulated and real networks. Our results show consistent throughput improvements, thanks to the use of aggregated path capacity. We give comparisons to Multipath TCP, where we show our approach can achieve a similar performance while offering the advantage of endpoint transparency

Study of various intrauterine pathologies by hysteroscopy leading to various gynaecological problems

Background: This study was to diagnose different types of intrauterine pathologies, their locations and relations with clinical presentations (like abnormal uterine bleeding (AUB), recurrent abortions, unexplained infertility and secondary dysmenorrhoea) by hysteroscopy. To know the prevalence and identification of the demographic relations of different intrauterine pathologies and clinical symptoms were observed. This study also aimed in selecting OPD or indoor operative procedure.Methods: Data collection of 144 cases was done with suspicion of intrauterine pathology on the basis of history and clinical examination. They were screened by per abdomen, per speculum, pelvic examination. USG and HSG in cases of infertility were used. Further intrauterine pathologies were explored by hysteroscopyResults: On hysteroscopy no abnormality was detected in 80/144 (55.6%) cases which was the maximum finding observed. AUB 96 (66.7%) was the most common presenting complaint followed by infertility 39 (27.1%). In 96 cases there was no organic pathology. Thickened endometrium was the commonest 17/144 (11.8%) pathology observed by hysteroscopy followed by endometrial polyp 14/144 (9.7%).Conclusions: With increasing demands for one-stop clinics where diagnosis and treatment are offered in same sitting. Diagnostic hysteroscopy by virtue of its diagnostic and therapeutic capabilities can become the procedure of first choice in evaluation of gynaecological problems

Cost variation analysis of oral anti-diabetic drugs

Background: Diabetes Mellitus is a chronic metabolic disorder, one of the major causes of morbidity, mortality and needs lifelong treatment. There are large numbers of oral anti-diabetic drugs available for the treatment of type 2 diabetes mellitus. There are numerous brands available for each of the individual oral anti-diabetic drug. Thus, a study was planned to find out cost variation among different brands of same active oral anti-diabetic drug.Methods: Cost of a particular drug being manufactured by different companies, in the same strength and dosage forms was obtained from the price list provided by the pharmaceutical companies in Current Index of Medical Specialities (CIMS) (October 2017- January 2018). The difference in the maximum and minimum price of the same drug manufactured by different pharmaceutical companies and percentage variation in price was analyzed.Results: Percentage cost variation of the commonly used drugs found was seen highest with Sulfonylureas (Glimepiride - 562%) followed by Metformin (492%) which was followed by Pioglitazone (488%), DPP-4 inhibitor Teneligliptin (231%), α- glucosidase inhibitors (Voglibose 284%), Meglitinides (Repaglinide 0.5mg 154%) and lowest was seen with Repaglinide 2mg (15%).Conclusions: There is very wide cost variation among different brands of the same oral anti-diabetic drugs manufactured in India. The average percentage cost variation of different brands of the same oral anti diabetic drugs manufactured in India is very wide. The appraisal and management of marketing drugs should be directed toward maximizing the benefits of therapy and minimizing negative personal and economic consequences

Physico-Chemical Parameters and Economic Evaluation of Bio-Ethanol Produced from Waste of Starting Dates in South Algeria

The fight against climate change and the replacement of fossil energies nearing exhaustion gradually emerge as major societal and economic challenges. It is possible to develop common dates of low commercial value, and put on the local and international market a new generation of products with high added values such as bio ethanol. Besides its use in chemical synthesis, bio ethanol can be blended with gasoline to produce a clean fuel while improving the octane

Physical Channel Access (PCA): Time and Frequency Access Methods Simulation in NS-2

We present an NS-2 module, Physical Channel Access (PCA), to simulate different access methods on a link shared with Multi-Frequency Time Division Multiple Access (MF-TDMA). This technique is widely used in various network technologies, such as satellite communication. In this context, different access methods at the gateway induce different queuing delays and available capacities, which strongly impact transport layer performance. Depending on QoS requirements, design of new congestion and ow control mechanisms and/or access methods requires evaluation through simulations. PCA module emulates the delays that packets will experience using the shared link, based on descriptive parameters of lower layers characteristics. Though PCA has been developed with DVB-RCS2 considerations in mind (for which we present a use case), other MF-TDMA-based applications can easily be simulated by adapting input parameters. Moreover, the presented implementation details highlight the main methods that might need modifications to implement more specific functionality or emulate other similar access methods (e.g., OFDMA)