High Load Control Mechanism for SIP Servers

To start voice, image, instant messaging, and generally multimedia communication, session communication must begin between two participants. SIP (session initiation protocol) that is an application layer control induces management and terminates this kind of sessions. As far as the independence of SIP from transport layer protocols is concerned, SIP messages can be transferred on a variety of transport layer protocols including TCP or UDP. Mechanism of Retransmission that is embedded in SIP could compensate for the missing packet loss, in case of need. This mechanism is applied when SIP messages are transmitted on an unreliable transmission layer protocol like UDP. Also, while facing SIP proxy with overload, it could cause excessive filling of proxy queue, postpone increase of other contacts, and add to the amount of the proxy overload. In the present work, while using UDP as transport layer protocol, invite retransmission timer (T1) was appropriately regulated and SIP functionality was improved. Therefore, by proposing an adaptive timer of invite message retransmission, attempts were made to improve the time of session initiation and consequently improve the performance. Performance of the proposed SIP was implemented and evaluated by SIPP software in a real network environment and its accuracy and performance were demonstrated

High Load Diminution by Regulating Timers in SIP Servers

To start voice, image, instant messaging, and generally multimedia communication, session communication must begin between two participants. SIP (session initiation protocol) that is an application layer control induces management and terminates this kind of sessions. As far as the independence of SIP from transport layer protocols is concerned, SIP messages can be transferred on a variety of transport layer protocols including TCP or UDP. Mechanism of Retransmission that is embedded in SIP could compensate for the missing packet loss, in case of need. This mechanism is applied when SIP messages are transmitted on an unreliable transmission layer protocol like UDP. Also, while facing SIP proxy with overload, it could cause excessive filling of proxy queue, postpone increase of other contacts, and add to the amount of the proxy overload. In the present work, while using UDP as transport layer protocol, invite retransmission timer (T1) was appropriately regulated and SIP functionality was improved. Therefore, by proposing an adaptive timer of invite message retransmission, attempts were made to improve the time of session initiation and consequently improve the performance. Performance of the proposed SIP was implemented and evaluated by SIPP software in a real network environment and its accuracy and performance were demonstrated

Effectiveness of topical Clinda Soap in the treatment of acne vulgaris

BACKGROUND: A variety of drugs can be used for the treatment of acne vulgaris. Every medicine acts against one or some of the mechanisms of the pathogenesis of acne vulgaris. This study was conducted to assess the therapeutic effect of Clinda Soap in the treatment of acne vulgaris. METHODS: This randomized, double-blind, clinical trial included 82 patients (age: 15-35 years) with mild to moderate acne vulgaris. The study protocol was approved by the ethics committee of Kurdistan University of Medical Sciences (Sanandaj, Iran). The patients were randomized into two groups to receive the standard treatment for acne vulgaris with either Clinda Soap (containing clindamycin hydrochloride 1%, manufactured by Shadakish Company, Iran) or a placebo soap. Both the intervention and control groups were asked to apply soaps twice daily for three months. Monthly examinations were performed by a dermatologist to ensure proper use of the soaps and to assess the rate of recovery and possible complications. Data was analyzed using repeated measures analysis of variance in SPSS. RESULTS: The mean age of patients was 21.1 ± 4.7 years in the intervention group and 21.5 ± 4.8 years in the control group. The mean duration of the disease was 3.0 ± 1.5 and 3.1 ± 1.8 months in the intervention and control groups, respectively. The mean number of comedones in the two groups had no significant difference at any monthly visit. In contrast, at all visits, significantly fewer papules and pustules were observed in the intervention group than in the control. Significant intra-group and inter-group differences in the number of inflammatory lesions (papules and pustules) were also seen. CONCLUSION: In general, it can be concluded that Clinda Soap is effective in the treatment of acne vulgaris. The recovery rate of papules and pustules was higher than that of comedones. Easy application of this soap together with its low cost and few adverse effects will increase patients' compliance

Dynamic Prioritization of Path for Quality-of-Service Differentiation in Multi-Priority Traffic

The emergence of value added services relying on a higher interactivity has altered the requirements of current transport network. Diverse traffic classes are processed by a large-scale optical network, imposing a more efficient utilization of their network infrastructure resources. Such services generally cross multiple domains, but inter-domain path computation algorithms still have some limitations. This paper describes a priority based path computation algorithm to meet all QoS requirements with the available capacity. The proposed algorithm increases the rate of successful replies while minimizing the blockage in network. The dynamic traffic is classified into high and low priority, so it improves emergency response in network

QUALITY OF SERVICE GUARANTEE IN SMART GRID INFRASTRUCTURE COMMUNICATION USING TRAFFIC CLASSIFICATION

ABSTRAC