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A study about process improvement with six sigma methodology in customer support department
Today, institutions and organizations are under a serious change pressure due to the rapid and continuous development of information and technology depending on internal and external factors. This pressure reveals two types of exchange processes. The first one is the institutions that encounter with this change pressure spontaneously and the second one is that actualize the change in a planned and organized way. If the companies would manage this change, they can consistently expand their company. Also, they would easily overcome potential crisis situations. This solution can come true with the monitoring and processing the business processes. The companies that target excellence in business processes use Six Sigma methodology intensively. Output point of the Six Sigma is the excellence in production and today Six Sigma is used in both production and service processes actively. The focal point of Six Sigma is the customer. At this point, Six Sigma projects aim to increase customer satisfaction and profit and decrease time loss by increasing quality, efficiency. Therefore, for the institutions and organizations that focused on customer, Six Sigma methodology is an invaluable asset. Nearly all of the top 100 largest companies in Turkey are actively carrying out Six Sigma activities and have made various success stories. This study examines the ideology, historical processes, and development of the Six Sigma methodology, including Six Sigma tools and their areas of use. Also, an application of Six Sigma methodology from a leading construction machinery organization is examined. This organization is a rare company that spreads Six Sigma methodology among its own and group companies in Turkey. This Six Sigma Project is designed to avoid machinery piece losses and prevent financial threats arising from unregistered stockpiles of scrap parts resulting from Warranty Service. Six Sigma Project is started to solve the problems experienced in the process that begins with receiving scrap parts from the customer until disposing of that parts after the Warranty Service. It was aimed to prevent the entering of scrap pieces to the market and to record, control the logistic movements of all of these parts.
Detection of debit card fraud through random forest
As one of the most frequently used financial tools in our life, ATMs have become a target for fraudsters in the same frequency. Particularly, security vulnerabilities of debit cards, which are generally produced by using magnetic stripes, was seen as an opportunity for fraud. As a result of exploiting those security vulnerabilities, important amounts have been fraudulently withdrawn from customer accounts. In this thesis, a data mining model was established for detection of debit card fraud through debit card transaction data of a bank. Firstly, transaction variables were defined in the ATM cash withdrawal dataset with consideration of their relevance in the debit card fraud detection. Consequently, behavioral RFM (Recency, Frequency, Monetary) variables, which are suggested as relevant in debit card fraud detection literature, were calculated based on those transaction variables. Secondly, several experiments were made through the classification model created by random forest algorithm by changing algorithm parameters. In the concluding remarks, the results of the established model were summarized and, considering practical implementations, some assessments regarding a real-time debit card fraud detection system were made.
Orta gerilim elektrik dağıtım sektöründe proje tamamlanma zamanlarının belirlenmesi
Endüstrilerde elektriğe olan bağımlılığın artması santrallerin herhangi bir gecikme olmaksızın zamanında işletmeye açılmasını zorunlu kılmaktadır. Elektrik tedarikinde yaşanması olası bir kesinti, siparişlerin zamanında yetiştirilememesi nedeniyle maruz kalınacak zararlar, tazminatlar ve piyasadaki prestij kayıplarına neden olmaktadır. Bunun yanısıra üretimden kaynaklanan hammadde ve yarımamul kayıpları ve bozulmalara neden olmaktadır. Bu çalışmada orta gerilim dağıtım şebekesine bağlanacak olan bir rüzgar enerji santralinin dağıtım şebekesine bağlanması için gerekli olan donanımların ve işlerin tamamlanma zamanlarının belirlenmesi, kritik yolun oluşturulması ve minimum maliyetle yapılması amaçlanmıştır. Problem çok projeli, zaman-maliyet etkileşimli, öncelik ilişkili bir çizelgeleme problemi olarak ele alınmıştır. Çalışmada projenin gerçekleştirilmesine yönelik teknik bilgi ve proje aşamalarının zaman bilgileri, öncelikleri ve maliyetlerine ilişkin ayrıntılı bilgiler verilmiş; Kritik Yol Yöntemi (CPM), Proje Değerlendirme ve Gözden Geçirme Tekniği (PERT) ve Hızlandırma yöntemleri açıklanmıştır. Rüzgar santralinin tamamlanmasına yönelik zamana ve proje maliyetlerine ilişkin veriler PERT ve Hızlandırma yöntemlerine göre analiz edilmiştir. Sonuçlarda projenin en kısa zamanda tamamlanma süresi ve maliyeti belirlenmiş, projenin hızlandırılması neticesinde kısaltılmış zaman ve hızlandırma maliyeti belirlenerek maliyet kar karşılaştırılma yöntemi ile şirket karar sürecine yönelik önerilerde bulunulmuştur.
Yakıt türüne göre motosiklet seçimi ve yeni bir tasarım
Motosikletler günümüz koşullarına oldukça uygun ulaşım araçları olup Motosikletler benzinli ve elektrikli olmak üzere ikiye ayrılır. Bu çalışmada elektrikli ve benzinli motosikletler belirli parametreler ile karşılaştırılarak incelenecektir. Çalışmada motosiklet kullanıcılarının fikirleri doğrultusunda elektrikli ve benzinli motorların özelliklerinin ayrıntılı olarak araştırılması ve ölçülebilen değerlerin belirlenerek karşılaştırma verisi olarak kullanılması amaçlanmaktadır. Kullanıcıların fikirlerini belirleyebilmek amacıyla bir sorgulama sistemi oluşturulacak, alınan cevaplar doğrultusunda tercih sebepleri ve parametreler belirlenecektir. Ölçülen değerler ve sorgulama sistemi sonucunda elde edilen veriler uygun yöntemler kullanılarak karşılaştırılarak, yorumlanacak ve çalışma tamamlanacaktır.
Filistin'deki devlet hastanelerinin sismik değerlendirilmesi
Due to their diverse complexities, hospitals have specific regulatory construction requirements to mitigate physical and functional vulnerabilities that can arise during seismic events. Special considerations in seismic risk mitigation are needed to create a safe environment for patients and staff during disasters as well as play a crucial role in saving lives and reducing the suffering after disasters. The importance of safe and reliable hospital structures makes it abundantly clear that the engineers' primary duty to the public is ensuring that hospitals can withstand disasters related to seismic events. Our main concern is seismic parameters that take into account site conditions. In this research, we present a topographic influence and the effect of its modifications on seismic behavior, as well as differences in the design of public-hospital facilities in Palestine based on the time period of the basic mode of construction according to codes of practice .It has been shown that seismic behavior varies from one region to another and from one structure to another according to many variables including the type of soil to be built on, and the seismic behavior variables across regions and structures , different terrains directly affect seismic design elements, system considerations, and structural analysis methodologies. This study chose different types of public hospitals in Palestine and collected various statistical information about the nature of their practice in the previous years. The data were used to build three distinct hospital models based on three different topographies: Qalqilya, Ramallah, and Jericho. To complete the analysis and provide the required suggestions, the time frame for the basic model of the structure should be established as a minimum to reach the safety of public hospitals in multiple building systems of the same structure. The local code-based assessment was carried out using a variety of tools, including the ETABS program, which employed the capacity spectrum method. Pushover analysis is a form of non-linear static analysis that is used in the construction industry. Results have been reached that put the structural designer on the right track for safe structural design within the engineering specifications and conditions