ALACA: A platform for dynamic alarm collection and alert notification in network management systems

Mobile network operators run Operations Support Systems that produce vast amounts of alarm events. These events can have different significance levels and domains and also can trigger other ones. Network operators face the challenge to identify the significance and root causes of these system problems in real time and to keep the number of remedial actions at an optimal level, so that customer satisfaction rates can be guaranteed at a reasonable cost. In this paper, we propose a scalable streaming alarm management system, referred to as Alarm Collector and Analyzer, that includes complex event processing and root cause analysis. We describe a rule mining and root cause analysis solution for alarm event correlation and analyses. The solution includes a dynamic index for matching active alarms, an algorithm for generating candidate alarm rules, a sliding window–based approach to save system resources, and a graph-based solution to identify root causes. Alarm Collector and Analyzer is used in the network operation center of a major mobile telecom provider. It helps operators to enhance the design of their alarm management systems by allowing continuous analysis of data and event streams and predict network behavior with respect to potential failures by using the results of root cause analysis. We present experimental results that provide insights on performance of real-time alarm data analytics systems. Copyright © 2017 John Wiley & Sons, Ltd

The Motivation Factors For In-house Industrial Designers In Turkey

Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2013Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2013Bu çalışmada, firmalarda istihdam edilen veya hayatının bir döneminde istihdam edilerek çalışmış olan endüstri ürünleri tasarımcılarının motivasyon faktörlerini incelemek üzere bir araştırma yapılmıştır. Türkiye’de bu alanda benzeri bir araştırma bulunamadığından dolayı, araştırma sorusunun yanıtları alınmak üzere yapılan çalışma bu alanda başlangıç niteliğindedir. İş yaşamında motivasyon konusunun özellikle başarı için önemli bir unsur olması sebebiyle, bu meslek dalı için motivasyon faktörlerinin incelenmesi gerekmektedir ve bulgular değerlendirilmelidir. Elde edilen sonuçların, Türkiye’de istihdam edilen ve çeşitli firmalarda görev yapan Endüstri ürünleri tasarımcılarının verimliliğinin arttırılması ve onlara daha bilinçli yaklaşılmasını sağlayacak bir kaynak olarak kullanılması hedeflenmiş ve çalışma tamamlanmıştır. Sonuçlar, daha sonra bu alanda yapılacak araştırmalar için bir kaynak olacaktır.In this study, a research has been conducted to evaluate the motivation factors of in-house industrial product designers who are, or once have been, employed by companies.The study was thus brought to an end hoping that results achieved would be used as a reference source of enhancing efficiency of Industrial product designers working as in-house designers in various companies in Turkey and of exhibiting a more well-informed approach towards them. Results would turn out to be a reference source for new researches to be conducted in this field. As aspect of motivation is a particularly important factor of success in business life, one needs to evaluate factors of motivation for this branch of profession and to assess relevant findings.Yüksek LisansM.Sc

The structural, magnetic and magnetocaloric properties of MnCrNiGeSi high-entropy alloy

WOS:000814372500001The structural, magnetic and magnetocaloric properties of Mn20Cr14Ni33Ge25Si8 and Mn24Cr10Ni33Ge25Si8 high entropy alloys (HEAs) were investigated. The HEAs were prepared by arc melting method. The structural analysis indicates that the structure of HEAs is orthorhombic with Pnma space group. In magnetic measurements, the maximum saturation magnetization was found to be 56.7 A m(2)kg(-1). The Curie temperature of HEAs is 361 and 387 K, respectively. The Curie temperature shifts to the high temperature, when 4% Mn is added, resulting the long-range orientation of the magnetic moments. The magnetic entropy change of Mn24Cr10Ni33Ge25Si8 is 3.6 Jkg(-1)K(-1) at around 387 K. Consequently, Large magnetic entropy change is achieved with low hysteresis and soft magnetic property at high temperature