WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/20.500.11779/256

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Now showing 1 - 20 of 693

Citation - WoS: 5
Fuzzy Optimization for Portfolio Selection Based on Embedding Theorem in Fuzzy Normed Linear Spaces
(De Gruyter, 2014) Solatikia, Farnaz; Kılıç, Erdem; Weber, Gerhard-Wilhelm
In this paper, we propose a novel approach Embedding Theoremabout Menger probabilistic normed Spaces. The main idea behind ourapproach consists of taking advantage of interplays between Mengerprobabilistic normed spaces and normed spaces in a way to get anequivalent stochastic program. This helps avoiding pitfalls due to severe over simplification of the reality. The embedding theorem showsthat the set of all fuzzy numbers can be embedded into a Mengerprobabilistic Banach space. Inspired by this embedding theorem, wepropose a solution concept of fuzzy optimization problem which isobtained by applying the embedding function to the original fuzzyoptimization problem.
Citation - WoS: 9
Citation - Scopus: 12
A New Triangular Composite Shell Element With Damping Capability
(Elsevier, 2014) Körük, Hasan; Şanlıtürk, Kenan Yüce
This paper presents a new triangular composite shell element with damping capability. Formulation of the composite triangular shell element is based on stacking individual homogeneous triangular shell ele- ments on top of each other. The homogeneous shell element is an assembly of a triangular membrane element with drilling degrees of freedoms and a plate element. Damping capability is provided by means of complex element stiffness matrix of individual flat layers of the composite element. These elements with damping capability allow modelling general structures with damping treatments. A few test cases are modelled using triangular finite element developed here and the results of the complex eigenvalue analyses are compared with those of the quadrilateral shell elements proposed recently. The results obtained using the presented triangular and previous quadrilateral composite elements are also com- pared with those based on modal strain energy method and experimental results. Comparisons of the experimental and the theoretical results confirm that the modal properties including modal damping lev- els of structures with damping treatments can be predicted with high accuracy using the proposed finite element.
Citation - WoS: 11
Citation - Scopus: 17
Quantification and Minimization of Sensor Effects on Modal Parameters of Lightweight Structures
(JVE INTERNATIONAL LTD., 2014) Körük, Hasan
This paper aims to quantify the adverse effects of contact type sensors on modal parameters of lightweight structures and to present a practical way for identification of modal parameters of structures with minimal sensor effects. The adverse effects of a contact type sensor on natural frequencies, damping levels and mode shapes are explored using the theoretical model of a typical beam-like sample carrying a sensor and a controlled experimental study based on measurement of frequency response functions using non-contact excitation and response sensors. The half-power and circle fit modal identification methods are used to extract modal parameter from measured data. The experimental and theoretical modal analysis results are evaluated, and a practical methodology based on classical acoustic and vibration frequency response functions is suggested to identify modal loss factors and natural frequencies of lightweight structures with minimal sensor effects.
Citation - WoS: 3
Citation - Scopus: 3
Cancer Chemotherapy Treatment Patterns and Febrile Neutropenia in the Us Veterans Health Administration
(2014) Wang, Li; Dale, David C; Barron, Richard; Langeberg, Wendy J; Başer, Onur
Background: The Veterans Health Administration (VHA) is the largest integrated health care system in the United States and a major cancer care provider. Objective: To use VHA database to conduct a population-based study of patterns of myelosuppressive chemotherapy use and to assess the incidence and management of febrile neutropenia (FN) among VHA patients with lung, colorectal, or prostate cancer or non-Hodgkin lymphoma (NHL). Methods: Data were extracted for the initial myelosuppressive chemotherapy course for 27,899 patients who began treatment in the period 2006 to 2011. FN-related costs were defined as claims containing FN diagnosis. Results: Most patients were men (98.0%); most were 65 years or older (55.8%). Patients received a mean 3.4 to 3.9 chemotherapy cycles/course (median cycle duration 34-43 days). The incidence of FN among patients with lung, colorectal, or prostate cancer or NHL was 10.2%, 4.6%, 5.4%, and 17.3%, respectively. Primary or secondary prophylactic antibiotics/colony-stimulating factors were received by 21% and 12% of patients, respectively. Antibiotics were more commonly given as primary or secondary prophylaxis for patients with lung, colorectal, and prostate cancer; colony-stimulating factors were more common for patients with NHL. Among patients with FN, those with lung cancer had the highest inpatient mortality (10%); patients with NHL had the highest costs ($24,571) and the longest hospital length of stay (15.4 days). Conclusions: VHA cancer care was generally consistent with National Comprehensive Cancer Network recommendations; however, compared with the general population, chemotherapy cycles were longer, combination chemotherapy was used less, and treatment to prevent FN was used less, differences that may be attributed to the unique VHA patient population. The impact of these practices warrants further investigation.
Citation - WoS: 1
Citation - Scopus: 1
1441. Quantification of the Flow Noise in Household Refrigerators
(JVE INTERNATIONAL LTD., 2014) Körük, Hasan; Arısoy, Ahmet; Bilgin, Necati
The flow noise in household refrigerators is quantified in this study. First, the sound pressure measurements in a quiet room using typical household refrigerators are conducted and the noise characteristics of the refrigerators are presented. Then, the flow noise in household refrigerators is quantified using the results of the overall analysis and Fourier transform of the measured sound pressure data. After that, the flow noise in household refrigerators is quantified using the sound pressure measurements conducted using a specially designed test rig. The frequency characteristics of the flow noise in household refrigerators are also explored and the contribution of the flow noise is identified.
Citation - WoS: 1
Citation - Scopus: 3
The Importance of Rural, Township, and Urban Life in the Interaction Between Social and Emotional Learning and Social Behaviors
(EDAM (Educational Consultancy and Research Center), 2014) Kıyar, Fatma; Totan, Tarık; Atalay, Zümra; Deniz, M. Engin
Whether an individual lives in a rural or urban setting may have direct impact on a wide variety of psychological patterns adopted by students. In this study, the effects of positive and negative social behaviors on the relationship between social and emotional learning needs and skills gaps of students who reside in both rural and urban areas have been examined. The participants of this research consist of 348 female and 319 male students, forming a total of 667 middle school students living in the province of Çanakkale, Turkey as well as in its surrounding areas. The Matson Social Skills Evaluation Scale, the Social-emotional Learning Scale, the Social and Emotional Learning Skills Scale, and personal information form were used to collect data for this research. The Baron and Kenny’s approach and the Sobel test were followed during the examination of the model created in the data analysis process. The mediator test examined the effects of positive and negative social behaviors in relationship to students’ level of social and emotional learning needs and social and emotional learning skills. As a result of this test, it was found that both positive and negative social behaviors exert partial mediation effects over students living in rural and urban areas of the province of Turkey researched.
Citation - WoS: 4
Citation - Scopus: 4
Perceptual Coding-Based Informed Source Separation
(2014) Girin, Laurent; Kırbız, Serap; Ozerov, Alexey; Liutkus, Antoine
Informed Source Separation (ISS) techniques enable manipulation of the source signals that compose an audio mixture, based on a coder-decoder configuration. Provided the source signals are known at the encoder, a low-bitrate side-information is sent to the decoder and permits to achieve efficient source separation. Recent research has focused on a Coding-based ISS framework, which has an advantage to encode the desired audio objects, while exploiting their mixture in an information-theoretic framework. Here, we show how the perceptual quality of the separated sources can be improved by inserting perceptual source coding techniques in this framework, achieving a continuum of optimal bitrate-perceptual distortion trade-offs.
Citation - WoS: 8
Citation - Scopus: 9
A Value-Adding Approach To Reliability Under Preventive Maintenance Costs and Its Applications
(2014) Dubey, Rameshwar; Kılıç, Erdem; Ali, Sadia Samar; Weber, Gerhard Wilhelm
No equipment (system) can be perfectly reliable in spite of the utmost care and best efforts on the part of the designer, decision-maker and manufacturer. The two sides of maintenance are corrective and preventive maintenance. It is generally assumed that a preventive maintenance action is less costly than a repair maintenance action. We examine this proposition in detail on the basis of a failure-time model that relates conformance quality to reliability. Illustratively, we present reliability in the context of contracts with asymmetric information. The model shows how to overcome information rents through price distortions and quantity rationing. The paper ends with a conclusion and an outlook to future studies.
Citation - WoS: 14
Citation - Scopus: 13
Hepatic Decompensation in Patients With Hiv/Hepatitis B Virus (hbv)/Hepatitis C Virus (hcv) Triple Infection Versus Hiv/Hcv Coinfection and the Effect of Anti-Hbv Nucleos(t)ide Therapy
(2014) Wang, Li; Devine, Scott; Lo Re, Vincent, III; Olufade, Temitope; Başer, Onur
The incidence rate of hepatic decompensation was higher in patients with human immunodeficiency virus (HIV)/hepatitis B virus (HBV)/hepatitis C virus (HCV) triple infection than in those with HIV/HCV coinfection (24.1 vs 10.8 events per 1000 person-years; hazard ratio [HR], 1.89; 95% confidence interval [CI], 1.12–3.18). Compared with HIV/HCVinfected patients, the rate of decompensation was increased among HIV/HBV/HCV-infected patients receiving no anti-HBV therapy (HR, 2.48; 95% CI, 1.37–4.49) but not among those who did receive such therapy (HR, 1.09; 95% CI, .40–2.97)
Citation - WoS: 54
Citation - Scopus: 63
An Assessment of the Performance of Impedance Tube Method
(Institute of Noise Control Engineering, 2014) Hasan Körük
The impedance tube method is widely used for measuring sound absorption (or reflection) coefficients of acoustic materials as a function of frequency. However, the sound absorption coefficients obtained using the impedance tube method may have some variations due to the dimensions (limits) of an impedance tube, sample preparation and sample mounting. This paper assesses the performance of the two-microphone impedance tube method as a function of frequency for different tube dimensions and materials and presents suggestions for increasing the reliability and repeatability of impedance tube measurements. First, after summarizing a systematic way for measuring acoustic transfer functions, sound absorption coefficients of a variety of materials ranging from conventional absorbing acoustic materials to samples with thin films are measured using two tubes with different tube diameter and microphone spacing. Uncertainty of sound absorption coefficients for various materials is discussed, and the frequency limits of impedance tubes are assessed. Then, a method for minimizing uncertainty due to sample mounting is proposed and the main findings are discussed.
Citation - WoS: 15
Citation - Scopus: 15
An Analysis of Turkey’s Water Diplomacy and Its Evolving Position Vis-À International Water Law
(Taylor & Francis, 2014) Kibaroğlu, Ayşegül
This article analyzes Turkey’s transboundary water policy by examining its institutional framework and basic principles. It explores the reasons why Turkey voted against the UN Watercourses Convention. Turkey’s harmonization with the water law of the European Union is also scrutinized with an aim to assess its implications for transboundary water policy making. Turkish water diplomacy faces new challenges, such as the devastating impacts of prolonged droughts as well as ongoing instability and conflicts in Syria and Iraq. Hence, it is imperative for Turkey to systematically reconcile its water policy objectives in accordance with the global norms that are adopted in this field
Prs23 - a Descriptive Analysis of Patient Characteristics and Health Care Burden Associated With Chronic Obstructive Pulmonary Disease in the Us Medicare Population
(2015) Xie, L.; Kariburyo, M. Furaha; Wang, Y; Başer, Onur
Objectives: To evaluate the patient characteristics and health care burden associated with chronic obstructive pulmonary disease (COPD) in the U.S. Medicarepopulation. Methods: COPD patients were identified (International Classificationof Disease, 9th Revision, Clinical Modification [ICD-9-CM] codes: 491.xx, 492.xx and496.xx) using U.S. national Medicare claims from 01JAN2007 to 31DEC2010. The firstdiagnosis date was designated as the index date. Patients were required to: a) be age?65 years on the index date; b) have continuous medical and pharmacy benefits for 12months pre-index date (baseline period); c) have continuous enrollment for 12 monthspost-index date (follow-up period), unless there was earlier evidence of death; and d)have no COPD diagnosis pre-index date. The outcomes of interest included medicationuse, including a long-acting beta agonist (LABA) or LABA/inhaled corticosteroid (ICS)combination, mortality and health care resource utilization and costs. Results: Atotal of 543,249 COPD patients were identified. Patients were, on average, age 78 years.Most patients were white (94%) and resided in the South U.S. region (41%). The averageCharlson Comorbidity Index score was 3.23, and hypertension (67%), diabetes (28%),congestive heart failure (21%) and chronic pulmonary disease (20%) were the mostfrequently diagnosed comorbidities. A 13.82% mortality rate was observed duringthe first year of the follow-up period. Post-index LABA medications, including arfomoterol (0.55%), formoterol (0.25%) and salmeterol (0.32%) were prescribed to 1.10%of the population. Identified LABA/ICS combinations included budesonide/formoterol(1.97%) and fluticasone/salmeterol (10.02%). High health care resource utilization wasencountered for Medicare carrier (99.40%), pharmacy (90.27%), outpatient (76.52%)and inpatient visits (48.83%). The main cost drivers were inpatient ($10,645), Medicarecarrier ($4,888), outpatient ($3,322) and skilled nursing facility ($2,695) costs, resultingin $25,397 in total health care costs. Conclusions: U.S. Medicare patients have ahigh COPD-related health care burden
Citation - WoS: 7
Citation - Scopus: 3
Facial Landmark Localization in Depth Images Using Supervised Ridge Descent
(2015) Camgoz, Necati Cihan; Gökberk, Berk; Akarun, Lale; Struc, Vitomir; Kindiroglu, Ahmet Alp
Supervised Descent Method (SDM) has proven successful in many computer vision applications such as face alignment, tracking and camera calibration. Recent studies which used SDM, achieved state of the-art performance on facial landmark localization in depth images [4]. In this study, we propose to use ridge regression instead of least squares regression for learning the SDM, and to change feature sizes in each iteration, effectively turning the landmark search into a coarse to fine process. We apply the proposed method to facial landmark localization on the Bosphorus 3D Face Database; using frontal depth images with no occlusion. Experimental results confirm that both ridge regression and using adaptive feature sizes improve the localization accuracy considerably.
17th International Conference on Mechatronics Technology, October 15-18, 2013, Jeju Island, Korea
(Elsevier, 2015) Hwang, Sung Ho; Kim, Joon-wan; Dorantes-Gonzalez, Dante Jorge
In recent years, Mechatronics has gained a lot of interest as more applications have been introduced to industry and society. The need for new mechatronic technologies in the form of advanced production systems, mechatronic devices, control systems, robotics, biomedical applications, MEMS, and measurement systems, among others, is very much required in improving productivity and competitiveness in many industries. Thus, this conference was organized to address the state-of-the-art technology for the benefit of researchers and users, and this time the conference made a special focus on the topic: Sustainable Mechatronics Technology.
Citation - WoS: 31
Financial Innovation-Crowdfunding: Friend or Foe?
(Elsevier, 2015) Son-Turan, Semen
A phenomenon with a considerable past, and with new conspicuous investment models and financial products and servicesproliferated through the Internet; financial innovation seems to be almost ubiquitous these days. While there are numerousadvantages, especially nowadays through the exploitation of easily accessible, low cost and convenient e-commerce platforms,innovation in the finance sector does not come without its perils. Banks and traditional financial institutions are losing chunks ofmarket share to virtual intermediaries and investors are operating in relatively less regulated and, consequently, less secureenvironments. Furthermore, from the perspective of all stakeholders, there is a Knightian uncertainty component of the long-termramifications in investing in and through newly developed products and platforms. As such, it is only recently that economichistory witnessed the outbreak of the sub-prime mortgage crisis caused by the unraveling of a chain of events interlinked throughthe imprudent use of “innovative” derivative transactions involving credit default swaps backed by the insatiable appetite of the“irrationally exuberant” investor and the easement of regulation paving the leeway for predatory lending. This paper investigateswhether and to what extent innovative investment models such as crowdfunding, as the game-changer, forcing the tightlyregulated securities markets to adapt to the rules of the WEB 3.0 era and relieved through the provision, Title III, of the JOBSAct, could be a potential peril. To that end, it discusses the evolution of the equity crowdfunding model in the realm of thetechnology push - demand pull framework and analyzes the current situation of the market.
Citation - WoS: 6
Citation - Scopus: 9
The Thinking-About Test for Undergraduate Students: Development and Validation
(2015) Ubuz, Behiye; Aydın, Utkun
Two studies were conducted for the development and validation of a multidimensional test to assess undergraduate students' mathematical thinking about derivative. The first study involved two phases: question generation and refinement of the Thinking-about-Derivative Test (TDT). The second study included four phases as follows: test administration, generalizability analysis, confirmatory factor analysis, and subgroup validity analysis. Findings suggested that the 30-item multiple-choice TDT, which comprises 6 mathematical thinking aspects, enactive, iconic, algorithmic, algebraic, formal, and axiomatic thinking, demonstrates acceptable levels of reliability and validity. Followed by additional cross-validation studies, the TDT may be a useful tool for mathematics education researchers and mathematicians. Directions for future research and implications for educational practice are discussed.
Pdb44 - Health Care Resource Utilization and Costs Among Diabetes Patients Residing in Long-Term Care Facilities
(2015) Huang, A; Shrestha, S; Başer, Onur; Yuce, H; Wang, L
OBJECTIVES: To evaluate health care resource utilization and costs among diabetespatients residing in long-term care facilities. METHODS: Patients diagnosed withdiabetes (International Classification of Diseases, 9th Revision, Clinical Modificationdiagnosis codes 250.x0, 250.x2) were identified using the Long-Term Care MinimumData Set (MDS) linked to 5% Medicare data from 01JAN2009 through 31DEC2010. Theinitial diagnosis date was designated as the index date. A comparison cohort wascreated for patients without diabetes, using 1:1 propensity score matching (PSM)to control for age, region, gender and baseline Charlson Comorbidity Index score.The index date for the comparison cohort was randomly chosen to reduce selection bias. Patients in both cohorts were required to be age ?65 years, have at leasttwo consecutive quarterly assessments documented in MDS data 6 months priorto the index date and have continuous medical and pharmacy benefits for 1-yearpre- and post-index date. Health care resource utilization and costs were comparedbetween the diabetes and comparison cohorts. RESULTS: After applying PSM, 783patients were included in each cohort, and baseline characteristics were balanced.Diabetes patients had a higher percentage of inpatient (31.29% vs. 22.73%, p=0.0001),skilled nursing facility (SNF, 31.55% vs. 22.73%, p<0.001), durable medical equipment (27.46% vs. 16.48%, p<0.0001) and pharmacy visit claims (93.10% vs. 88.76%,p=0.0028) compared to those without diabetes. Patients in the diabetes cohort alsoincurred significantly higher inpatient ($5,801 vs. $3,071, p<0.0001), SNF ($5,532 vs.$3,244, p<0.0001), carrier claim ($3,118 vs. $2,437, p=0.0002) and pharmacy visit costs($5,040 vs. $4,275, p=0.0005) than those in the comparison cohort. CONCLUSIONS:Patients diagnosed with diabetes had significantly higher health care resource utilization and costs than those without diabetes.
The Blue Peace: Achieving Peace and Security Through Water Cooperation
(SETA, 2015) Ahmmad, Yadgar; Kibaroğlu, Ayşegül; Vishwanath, Ambika
Water is about people and human security. Unfortunately water has become a source of conflicts around the world, especially in the Middle East. There is a critical need for active water cooper- ation between nations in the region. This article discusses possible ways to achieve such cooperation, using tools developed under the Blue Peace concept. The article highlights a positive example of con- crete steps taken by Turkey and Iraq in the area of track-two hydro diplomacy, which could potentially expand to other countries in the region. Experiences from around the world demonstrate that sustainable active water cooperation is possible and there are many examples that could be adapted by countries in the Middle East.
Citation - WoS: 2
Citation - Scopus: 5
Where Do We Go From Here? Is Responsibility Sustainable?
(2015) Wegge, Juergen; Pearce, Craig L.
In this special issue we have brought together a veritable ‘‘dream team’’ of thought leaders, and rising stars, from academia, consulting and the c-suite to address the ‘‘Leadership Imperative for Sustainability and Corporate Social Responsibility.’’ Clearly, the decisions and actions of individual leaders matter to the social performance and long-term viability of their organizations. Ultimately, activities such as formulating sustainability policies, engaging in community outreach programs, supporting social causes, or seeking alternatives to disruptive layoffs are the result of managerial decisions, and so are activities that are widely considered unethical, such as bribery, fraud, environmental pollution, and employment discrimination. While corporate executives are constrained in their ability to engage in these activities by corporate governance regulations, company policies, and the law, they have some degree of discretion in their choices. David Waldman, a noted leadership scholar, put it succinctly:‘‘Firms do not make decisions pertaining to responsibility or CSR; leaders do."
Citation - WoS: 4
Citation - Scopus: 8
Facial Landmark Localization in Depth Images Using Supervised Descent Method
(2015) Gökberk, Berk; Akarun, Lale; Camgoz, Necati Cihan
This paper proposes using the state of the art 2D facial landmark localization method, Supervised Descent Method (SDM), for facial landmark localization in 3D depth images. The proposed method was evaluated on frontal faces with no occlusion from the Bosphorus 3D Face Database. In the experiments, in which 2D features were used to train SDM, the proposed approach achieved state-of-the-art performance for several landmarks over the currently available 3D facial landmark localization methods.

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