4,237 research outputs found
Developing an Enterprise Resource Planning Project Management Roadmap: Cross-Country Comparison Turkey Versus Finland
No full textKurumsal Kaynak Planlama programları günümüzde firmaların hareketlerini görüntülemek, kontrol etmek ve yönetmek için kullanılan en yaygın iş akışı sistemleridir. Maliyeti çok yüksek olduğu için, bu programların doğru bir metodoloji kullanılarak kurulumu yapılmalıdır. Temel varsayımımız literatürde çeşitli yöntemler sunulmasına karşın, ülkeler arasındaki iş yapış farklarına bağlı olarak, kurulum başarı oranlarının değişiklik göstermesidir. Literatür tarama kısmında Kurumsal Kaynak Planlama, proje yönetimi ve iş yapış tarzlarındaki kültürel farklar araştırılmıştır. Kritik başarı faktörleri, harcamalar ve Kurumsal Kaynak Planlama proje yönetimlerine bakış açılarının bölgesel farklılıklarını gözlemlemek açısından, Türkiye'de ve Finlandiya'da anket çalışması yapılmıştır. Sonuçların analizindan sonra çıktılar çalışmanın sonunda tartışılmıştır. Bu çalışmanın sonuçlarının gelecekteki Kurumsal Kaynak Planlama kurumlarında yenilikçi ve destekleyici bir bakış açısı katması beklenmektedir.Enterprise Resource Planning programmes are most commonly used business transaction systems for monitoring, controlling and directing the business. The setup costs of these programmes are high, a proper methodology should be followed during the implementation process. Our main assumption is that although there are certain methodologies presented in the literature, due to the differences between business making styles between countries, the implementation success ratios differ from each other. In the literature review, the concepts like ERP, project management and national differences in business making concepts are investigated. A cross-country survey is conducted between Finland and Turkey, in order to determine the regional difference in critical success factors, expenses and sight of view in ERP project management. After the analyses of the results, outcomes are discussed in the end of the survey. The results of this study is expected to provide innovative and supportive perspective for future ERP implementations
Static and dynamic properties of CN/Cu(001) surfaces and oxidation, dissociation and bimolecular debarboxylation of isocyanate species adsorbed on Cu(001)
No full textThis dissertation presents an outlines my investigations of static and dynamic properties of adsorbed cyanide (CN) and isocyanate (-NCO) species as well as some of their chemistries. Surface bound CN-containing species have not previously been studied extensively, partially due to the inapplicability of fundamental e-beam based surface analysis techniques for investigations. I had the opportunity in my studies to employ multiple surface probing techniques, i.e. HAS, XPS, NEXAFS, TPD and RAIRS, to compile and cross-examine information from CN, –NCO, and derived species, adsorbed on the Cu(001) surface. While angle resolved He atom scattering (HAS) was employed to identify and investigate the ordered superstructure of CN/Cu(001) surfaces, TOF-HAS was employed to investigate its dynamic properties. The CN/Cu(001) surface induced unprecedented simultaneous coherent He diffraction with a large “classical” multiphonon backscattered He intensity. A superstructure is implied that contains both rigidly bound CN species, which maintain the long range c(10x6) translational symmetry, together with bound highly-dynamic CN species that exhibit large thermally induced displacements. The NEXAFS measurements suggest multiple spatial binding configurations for the adsorbed CN moieties. In addition, TPD spectra of C2N2 desorption from CN/Cu(001) surface were analyzed, using my newly developed method, to determine the activation energies for desorption as a function of CN coverage. There are two reactions of NCO species examined in my studies. The first is the newly discovered mutual reaction between NCO species. This type of interaction had not been seen before, as it is essentially difficult to prepare pure NCO/metallic surfaces. Copper was chosen as a substrate as HNCO exposures of Cu(001) at RT, followed by spontaneous H2 desorption, do produce NCO only surfaces. A thermal treatment of the surface, at 573K, leads to a bimolecular decarboxylation of NCO, leaving a carbodimide species (NCN) on the surface. The sp-hybridized linear NCN moieties, which are bound nearly parallel to the substrate, show high thermal stability. The second reaction of NCO, which I have studied, is its oxidation. In particular, the effect of CN coadsorbates on the oxidation of NCO was studied. It was found that the presence of CN catalyzes a dissociation reaction of NCO species on Cu(001).Ph. D.Includes bibliographical referencesby Erkan Ziya Ciftlikl
Izbor najboljeg sustava za dobivanje podataka o skladištu primjenom metoda AHP i FAHP
No full textERKAN, TURAN ERMAN/0000-0002-0078-711XRecently companies have begun to use their storage effectively to attain leadership in the market environment, utilizing Barcode and RFID (Radio Frequency Identification) systems for warehouse management. In this study AHP (Analytic Hierarchy Process) and FAHP (Fuzzy Analytic Hierarchy Process) are used to choose between Barcode and RFID systems for the company warehouse data collection system. This decision is affected by four criteria which are: cost, functionality, sustainability and performance. The barcode system was preferred by 68 % and RFID was preferred by 32 % according to AHP. For FAHP, barcode system was preferred by 72 % and RFID was preferred by 28 %. Consequently AHP values are consistent with FAHP values. Finally barcode system is selected for the company's warehouse data collection system and FAHP is found to be relatively more sufficient in terms of description of this decision-making process because of its fuzziness and vagueness compared to AHP method.Science Citation Index Expande
A paper on the unsettled question of Turkish electricity market: Balancing and settlement system (Part I)
No full textTurkish electricity market law (EML) came into force in 2001 aiming at establishing a financially strong, stable, transparent and competitive electricity market based on bilateral contracts. Also, a balancing and settlement system (BSS) was put into practice in November 2004 to create a market where uncontracted generation can be traded, and actual implementation of the BSS started on August, 1st 2006 following a 21-month virtual implementation period. However, BSS has always been criticized from its beginning as transferring excessive profits to private generation companies. The present paper analyzes the implementation of BSS and argues that current BSS not only undermines the healthy development of the electricity market in Turkey but also prevents power investments due to uncertainties it created. It concludes that since the inconsistency between the objectives of EML and results of BSS in practice is obvious, Turkish policy makers need to modify current electricity market policy in line with suggestions presented in the paper.Balancing and settlement; Turkey; Electricity wholesale market
Distribution of surface heat flow and effects on the subsurface temperatures in the northern part of Thrace Basin, NW Turkey
No full textThe Thrace Basin in northwestern Turkey is a deep Eocene–Oligocene hydrocarbon-bearing sedimentary basin. The basin has potential for geothermal energy utilization in the future due to its favorable geological conditions. In this study, we combined the available bottom hole temperature (BHT) data from 70 points with the thermal conductivity and radiogenic heat productions of the basin formations, and generated a detailed thermal model of the northern part of the basin. For heat flow determinations from the BHT data, we applied Bullard’s thermal resistance method on formation thermal conductivities and thicknesses. The results give an average surface heat flow of 65.8 ± 11.3 mW/m2. We obtained high heat flow values (75–80 mW/m2) in the eastern and western sides, and the central part of the study area. These relatively high heat flow values can be explained by the combined effect of basement topography and the variations in the radiogenic heat production of the basement rocks. The calculated subsurface temperatures in selected hydrocarbon fields vary in the range of 45–64 °C at 1 km depth, 99–136 °C at 3 km depth, and 155–208 °C at 5 km depth as a result of local variations of the surface heat flow and formation thermal resistances. These variations in subsurface temperatures can have significant effects on the cost of geothermal energy production in future
Cyclic shear displacement model for reinforced concrete columns
No full textLateral response of reinforced concrete (RC) columns can be modeled and simulated considering three displacement components: flexural displacement, displacement due to slippage of longitudinal bars at column ends, and shear displacement. The incorporation of shear displacement in a computational model is essential for accurate calculation of lateral load–displacement relationship. The contribution of shear displacement can be significant for RC columns with low displacement capacity or ductility. An easy-to-apply shear displacement model is proposed in this study, and implemented in the open source software, OpenSees. The proposed model is based on a pre-defined envelope or monotonic model and does not require updating of modeling parameters during each cycle. The model is validated using experimental data. New rules are developed for the cyclic model to capture the effects of cracking and change in stiffness and strength during the loading and unloading cycles. Comparison of the calculated and measured shear displacements indicates that the cyclic shear response can be captured by the proposed model
Aydın ili jeotermal enerji santrallerinden çıkan atık ısının şehir ısıtmada kullanımının araştırılması
No full textJeotermal enerji, yer ısıl enerjisi anlamına gelmektedir ve günümüzde kullanımı artan bir enerji türüdür.
Türkiye jeotermal enerji bakımından önemli kaynaklara sahip bir ülkedir. Özellikle Ege Bölgesi’ndeki
Büyük Menderes havzasında çok sayıda jeotermal enerji santrali (JES) mevcuttur. Bu santrallerin çoğu
Aydın ilinde bulunmaktadır. Bu çalışmanın amacı, Aydın ilindeki JES’lerden çıkan atık ısının konut
ısıtılmasında değerlendirilmesi ve böylece şehirde ortaya çıkan CO2 emisyonundaki azalımın
hesaplanmasıdır. Aydın ilindeki JES’lerin ve bunlardan çıkan atık ısı miktarlarının yüksek olmasının
yanında ısıtılması planlanan havza içindeki ilçe merkezlerinin konumları ve nüfus yoğunlukları bu
çalışmanın temel motivasyonudur. Çalışma kapsamında Aydın ilinde halen faal olan JES’lerle ilgili
verilerin elde edilmesinden sonra çıkan atık ısı miktarı ayrı ayrı her santral için hesaplanmıştır. Enerji
dağıtımında ortaya çıkan ısı eşanjör ve radyatör verimleri Türkiye’deki faal olan jeotermal ısıtma
uygulamaları referans alınarak hesaplanmıştır.Isıtılması planlanan havza içindeki ilçelerin merkez
mahallelerinin yıllık ısı yükleri; nüfus, hane halkı büyüklüğü vb. gibi veriler kullanılarak hesaplanmıştır.
Yapılan tüm hesaplamaların sonucunda JES’lerden elde edilen atık ısı ile Büyük Menderes havzası içinde
bulunan Söke, Germencik, İncirliova, Efeler, Köşk ilçelerinin % 93,79’unu, Sultanhisar, Nazilli, Kuyucak
ve Buharkent ilçelerinin merkez mahallerinin ısıtma ve sıcak su ihtiyaçlarının ise tamamını
karşılayabilecek miktarda olduğu sonucuna ulaşılmıştır. Bu yolla temin edilebilecek ısıl enerji, 10.119,92
TJ olup 578.196 kişinin ısıtma ve sıcak su ihtiyacı karşılanabilmektedir. Havza içindeki ilçe merkezleri
doğalgaz ve kömür yerine jeotermal olarak ısıtıldığında Aydın ilindeki konutlardan oluşan yıllık toplam
CO2 emisyonunun % 40,84 oranında azalacağı hesaplanmıştır. Ayrıca Aydın ilinde ortaya çıkan yıllık
toplam CO2 emisyonunun % 14 azalacağı hesaplanmıştır.Geothermal energy is the thermal energy inside the earth, and has been increasing in use today. Turkey is
a country with significant resources in terms of geothermal energy. Especially in the Büyük Menderes
Basin in the Aegean Region, there are many geothermal power plants (GPP). Most of these power plants
are located in Aydın province. The aim of this study is to evaluate the district heating fromwaste heat
from GPP’s in Aydın province and to calculate the decrease in CO2 emission in the city as a result of
this. In addition to the fact that the GPP’s in Aydın province and the amount of waste heat generated
from them are high, the high number of dwellings and population densities of the city centers in the basin
are the main motivation of this study. Within the scope of the study, after obtaining data on the GPP
currently active in Aydın province the waste heat released from the power plants were calculated. The
heat exchanger and radiator efficiency of the heated environment have been calculated by taking into
account the geothermal heat applications that are active in Turkey. Annual heat demand of the city
centers that are planned to be heated were calculated by taking data on population, household size, etc.
into account. As a result of all the calculations,the waste heat obtained from JESin Büyük Menderes
Basin that is located can supply hot water needs of 93,79 percent in Söke, Germencik, Incirliova,Efeler,
Köşk, and meet the all of the heating and hot water need for Sultanhisar, Nazilli, Kuyucak,and Buharkent.
The heat energy that can be provided in this way is 10.119,92 TJ and the number of people whose heating
and hot water needs can be met is 578.196. It has been calculated that the total annual CO2 emissions
will decrease by 40.84% when geothermal is used in dwellings in Aydın Province, instead of natural gas
and coal. In addition, it has also been calculated that the total annual CO2 emissions to the environment
in Aydın province will decrease by 14%
Time dependent random fields on spherical non-homogeneous surfaces
No full textWe introduce a class of isotropic time dependent random fields on the non-homogeneous sphere which is represented by a time-changed spherical Brownian motion of order nu is an element of (0, 1]. We can capture some anisotropies in Cosmology with this model. This process is a time-changed rotational diffusion (TRD) or the stochastic solution to the equation involving the spherical Laplace operator and a time-fractional derivative of order nu. TRD is a diffusion on the non-homogeneous sphere and therefore, the spherical coordinates given by TRD represent the coordinates of a non-homogeneous sphere by means of which an isotropic random field is indexed. The time dependent random fields we present in this work are therefore realized through composition and can be viewed as isotropic random field on randomly varying sphere. Published by Elsevier B.V
Fractional Cauchy problems on compact manifolds
No full textWe investigate anomalous diffusion on compact Riemannian manifolds, modeled by time-changed Brownian motions. These stochastic processes are governed by equations involving the Laplace–Beltrami operator and a time-fractional derivative of order . We also consider time dependent random fields that can be viewed as random fields on randomly varying manifolds
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