Quality Of Service Enhancement In Ip Based Networks Using Diffserv

Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2003Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2003Bu çalışmada, Diffserv mimarisi ile internet üzerinde servis kalitesi sağlama tartışılmıştır. Son on yılda IP tabanlı internette servis kalitesi sağlanamıyordu. İnternette bugün sağlanabilen tek servis ‘Best Effort (BE)’ adı verilen servistir. Yani, ağ, herhangi bir paketi hedefine ulaştırırken mümkün olan en verimli yolu kullanır ancak herhangi bir garanti ya da kaynak ayırımı yapmaz. Başka bir deyişle, trafik mümkün olduğu kadar hızlı ve herhangi bir zaman sınırı ya da miktar açısından garanti verilmeden işlenir. İnternetin ticari bir yapıya bürünmesiyle ‘Servis Kalitesi’ sağlanma ihtiyacı daha da artmıştır. Bu ihtiyaç farklı mimarilerin doğmasına yol açmıştır: IntServ ve DiffServ olmak üzere.Tez çalışmasında DiffServ mimarisi problem ve avantajlarıyla ele alınmıştır. Son bölümde ise NS2 ağ simulasyon yazılımı kullanılarak DiffServ implementasyonları yapılmış sonuçları karşılaştırmalı olarak verilmiştir.In this study improving Quality of Service (QoS) on the Internet with DiffServ architecture is discussed. Within the past decade, it is certainly not support for Quality of Service (QoS) over the IP-based ubiquitous Internet. The Internet as it stands today only support one service class called -Best-Effort (BE) Service. The network would make an earnest attempt to deliver packets to their destinations but with no guarantees and/or special resources allocated for any of the packets. With another words, traffic is processed as quickly as possible but there is no guarantee as to timeliness or actual delivery or even how much can be delivered (i.e. throughput). With the rapid transformation of the Internet into a commercial infrastructure, demands for Quality of Service (QoS) have rapidly developed. This need was resulted to different architectures: IntServ and DiffServ. In the study some DiffServ implementations are discussed with their problems and gains. At the last section with using NS2 simulation programming language some DiffServ implementations are given with the compared results.Yüksek LisansM.Sc

The prioritisation of service dimensions in logistics centres: a fuzzy quality function deployment methodology.

This study takes a customer focus that prioritises the service-offering dimensions of logistics centres (LCs) by considering potential LC customer expectations. Applying a survey and a quality function deployment methodology to logistics service providers, the study explores, categorises and prioritises LC customer expectations and LC service characteristics. The results indicate that customer preferences mainly prioritise infrastructure, and warehouse and intermodal dimensions. However, when the cost dimension is included, higher utility values are delivered through soft service dimensions like value-added or standard services. LC investors or undertakers can use these results to guide their design of market offerings by using the same methodology to assess expectations in their target markets

Evaluation of septoplasty patients with health status scale, rhinomanometry, and computed tomography

Amaç: Deviye nazal septum (DNS) tanısı konan hastalarda spesifik yaşam kalitesi septoplasti öncesi ve sonrasında değerlendirildi; ayrıca, tanının laboratuvar bulgularla (anterior rinomanometri ve bilgisayarlı tomografi) ilişkisi incelendi. Hastalar ve Yöntemler: Çalışmaya DNS tanısı konan 39 hasta (8 kadın, 31 erkek; ort. yaş 41; dağılım 18-59) alındı. Hastalar septoplasti öncesinde, koronal planda paranazal sinüs tomografisi, anterior rinomanometri ve Burun Tıkanıklığı Şikayet Değerlendirme Formu (BTŞDF) ile incelendi. Ameliyat sonrası üçüncü ayda anterior rinomanometri ve BTŞDF tekrarlandı. Bulgular: Hastaların BTŞDF puanlarında ameliyat öncesine göre anlamlı azalma (p0.05). Sonuç: Burun tıkanıklığı yakınmasının değerlendirilmesinde BTŞDF yaşam kalitesi ölçeği olarak kullanılabilecek bir testtir. Tanı için rinomanometri veya bilgisayarlı tomografinin mutlak gerekliliği yoktur.Objectives: We evaluated disease-specific health status prior to and after septoplasty in patients with nasal septal deviation (NSD), and sought correlation between diagnosis and laboratory findings (anterior rhinomanometry and computed tomography). Patients and Methods: The study included 39 patients (8 females, 31 males; mean age 41 years; range 18 to 59 years) with a diagnosis of NSD. Prior to septoplasty, all patients were evaluated by coronal paranasal sinus computed tomography (CT), anterior rhinomanometry and the Nasal Obstruction Symptom Evaluation (NOSE) scale. Rhinomanometry and the NOSE scale were repeated three months after septoplasty. Results: Compared to the preoperative values, the patients exhibited a significant decrease in NOSE scores, and in rhinomanometry, significantly increased nasal airflow and decreased total nasal airway resistance (p0.05). Conclusion: The NOSE scale is a reliable test to assess health status of patients with nasal obstruction symptoms. The diagnosis of NSD does not require rhinomanometry or computed tomography

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