Arama Sonuçları
Listeleniyor 1 - 10 / 18
Yayın Relative effects of marketing effectiveness dimensions on firm performance: An empirical analysis with a multi-industry sample(Bogazici Universitesi, 2009) Gül, Mısra ÇağlaThe aim of this study is to understand the influence of marketing operational efficiency and marketing system effectiveness on firm performance dimensions. Marketing operational efficiency and marketing system effectiveness are two dimensions of marketing effectiveness derived as a result of the exploratory factor analysis performed on the data. Firm performance dimensions used in the study are overall performance, ROI, percentage of new product sales, change in market share, and sales growth, all measured relative to competitors. Multiple respondent firm level data are collected through a survey of 74 firms operating in a variety of industries, resulting in 296 individual surveys. Findings indicate that marketing operational efficiency, a set of short-term, operational dimensions, positively influences all of the firm performance dimensions. On the other hand, marketing system effectiveness, measuring longer-term, strategic factors, does not have such an impact.Yayın On progressive wave solution for non-planar KDV equation in a plasma with q-nonextensive electrons and two oppositely charged ions(Işık University Press, 2020) Demiray, Hilmi; El-Zahar, Essam Roshdy; Shan, Shaukat AliIn this paper, the ion-acoustic wave is investigated in a plasma with q-nonextensive electrons and two oppositely charged ions with varying masses. These parameters are found to modify the linear dispersion relation and nonlinear solitary structures. The reductive perturbation method is employed to derive modified Korteweg-de Vries (KdV) equation. To solve the obtained governing evolution equation, the exact solution in the planar geometry is obtained and used to obtain an analytical approximate progressive wave solution for the nonplanar evolution equation. The analytical approximate solution so obtained is compared with the numerical solution of the same nonplanar evolution equation and the results are presented in 2D and 3D figures. The results revealed that both solutions are in good agreement. A parametric study is carried out to investigate the effect of different physical parameters on the nonlinear evolution solution behavior. The obtained solution allows us to study the impact of various plasma parameters on the behavior of the nonplanar ion-acoustic solitons. The suitable application of the present investigations can be found in laboratory plasmas, where oppositely charged ions and nonthermal electrons dwell.Yayın Patient-centered outcomes of vertebroplasty via questionnaire(Galenos, 2019) Karaca, Sinan; Erdem, Mehmet NuriPurpose: Our aim was to evaluate patient centred outcomes of patients with compression fractures treated by vertebroplasty. Methods: Patients with compression fractures treated by vertebroplasty procedure between 2013- 2016 was examined with a 3-question through telephone call. Results: Fifty-two patients completed the telephone satisfaction survey. Of these, 92.5 % of answerers said the procedure was acceptable, 86.5% had full or partial pain remission and 78.8 % would have the procedure again. Conclusions: The use of vertebroplasty is supported by randomized trials in osteoporotic and malignant compression fractures. To the results of our study, patients believe vertebroplasty is a tolerable procedure that produces full or partial pain remission and would try the same procedure again if needed.Yayın Atatürk’ün halkçılık ilkesi üzerine bir tartışma: halkçılık mı popülizm mi?(Yerel Yönetim Araştırma Yardım ve Eğitim Derneği (YAYED), 2022-06) Yılmaz, Onur AlpLiteratürde üzerinde uzlaşma sağlanamamış bir kavram olan popülizmin bu niteliği, halka çağrı yapan bütün siyasi düşüncelerin popülizm olarak çerçevelenmesi gibi bir sonuca yol açar. Bu da “halkın yegane temsilcisi” ve “halkın kendisi” olma iddiasıyla yola çıkarak, kapsayıcılığı kadar dışlayıcılığı da olan popülizmle, halk lehine bir dönüşüm arzulayan ve halkın çıkarlarını siyasetlerinin merkezine koyan halkçıların arasındaki farkları ortadan kaldırır. Bir de buna Türkçenin konforunda iki kelimenin ayrı ayrı isimlendirilebilmesine karşın, İngilizcede iki kelimenin de aynı şekilde isimlendirilmesinin yarattığı çeviri problemleri eklenince iki kavram arasındaki ayrım ortadan tamamen kalkar. Türkiye’de bu kargaşadan payını alanlar, II. Meşrutiyet’in ardından ortaya çıkan ve Cumhuriyet’le birlikte bu düşüncelerini taçlandıran halkçılar oldular. Popülistlerle aralarında kurumsal, kavramsal, araçsal ve amaca dönük olarak birçok fark bulunmasına rağmen Osmanlı-Türk halkçıları, bu ayrımlar gözden kaçırılarak popülist olarak isimlendirildi. Dolayısıyla bu çalışma, literatürdeki bu kargaşayı gözler önüne sererken, aynı zamanda popülizm ve halkçılık arasına Atatürk’ün düşünce dünyası ve halkçılık pratiklerini ortaya koyarak literatüre katkı sunmaya amaçlar.Yayın A Comparison of high viscosity and low viscosity bone cement vertebroplasty for severe osteoporotic vertebral compression fractures(Galenos, 2019-01) Karaca, Sinan; Öztermeli, Ahmet; Akpolat, Ahmet Onur; Erdem, Mehmet Nuri; Aydoğan, MehmetIntroduction: Our aim in this clinical trial was to compare the safety and efficacy of highviscosity cement (HVC) with low-viscosity cement (LVC) for the treatment of osteoporotic vertebrae fractures in terms of pain, functional capacity and cement leakage in the percutaneous vertebroplasty procedure (PVP). Methods: From March 2013 to February 2015, 76 patients with vertebrae compression fracture who were admitted into hospital and treated with PVP were reviewed. Pre- and postoperative clinical characteristics of each patient were obtained by using The Visual Analog Scale (VAS) score to evaluate back pain, Oswestry Disability Index (ODI) as a functional assessment. Cement leakage,injected cement volume and the complications assessed due to medical records. Results: VAS and ODI scores improved (P<0.05) significantly in the two groups postoperatively on the other hand there was no significant change between two groups (P>0.05).Paravertebral cement leakage was significantly higher in the LVC group (P<0.05). Pulmonary cement embolism was also significantly higher in LVC group (P<0.05). Conclusion: HVC had lower complication rates with similar clinical results in the comparison with LVC.Yayın Evaluation of satisfaction with a questionnaire according to fracture level and fracture type of patients who underwent balloon kyphoplasty(Galenos Publishing House, 2022-04) Kültür, Yiğit; Bal, Emre; Erdem, Mehmet Nuri; Tezer, MehmetObjective: The aim of this study is to better understand which type of fracture and localization have more painful or worse outcomes for the kyphoplasty procedure. Materials and Methods: Kyphoplasty cases operated between 2013 and 2018 were included in the study. The patients were contacted through the numbers registered in the hospital system. A questionnaire were asked to the patients. Patients were grouped according to gender, fracture level (T12-L1 and others) and fracture type (Osteoporotic, trauma, malignancy, unknown). Results: Fourty-one patients were included in the study. Three-quarters of the patients were women and average age was 62. Ninety-two percent of the patients stated that the pain of the procedure was tolerable. Seventy percent reported that their pain decreased after the procedure and 75% of the patients stated that they could have this procedure done again. Pain reduction and the desire to have same surgery again were significantly higher in female patients than in the male group (p<0.05). In the T12-L1 group and osteoporotic fracture group, the procedure was more easily tolerated, the pain was relieved more and the desire to have the same surgery was higher (p<0.05). Conclusion: Kyphoplasty is accepted as an operation that is well tolerated by patients and has good pain relief. Additionally more detailed information was obtained about the patient’s complaints after the kyphoplasty procedure, according to the fracture level and type.Yayın Modulational instability of three dimensional waves in a plasma with vortex electron distribution(Işık University Press, 2019-02-10) Demiray, HilmiIn the present work, employing the three dimensional equations of a plasma composed of a cold electron fluid, hot electrons obeying a trapped / vortex-like distribution, and stationary ions, we study the amplitude modulation of an electron-acoustic waves by use of the conventional reductive perturbation method. Employing the field equations with fractional power type of nonlinearity, we obtained the three dimensional form of the modified nonlinear Schrodinger equation as the evolution equation of the same order of nonlinearity. The modulational instability of the homogeneous harmonic solution is investigated and the criteria for the instability is discussed as a function of the obliqueness angle. The numerical calculations show that the critical value of the wave number of the envelop wave increases with the wave number k of the carrier wave and the obliqueness angle gamma.Yayın Ergenlerde algılanan ebeveyn tutumu ve duygusal zeka arasındaki ilişkide, dijital oyun bağımlılığının aracı rolünün incelenmesi(ANP Publishing, 2021) Tetik, Gizem; Aktan, Zekeriya DenizAmaç: Günümüzde ergenler için bir sorun haline gelen dijital oyun bağımlılığının, duygusal zeka düzeyi ve ebeveyn tutumu ile ilişkili olduğu bilinmektedir. Araştırmanın hedefi, ergenlik dönemindeki algılanan anne-baba tutumları ile duygusal zekâ arasındaki ilişkide, dijital oyun bağımlılığının aracı (medyatör) etkisinin bulunup bulunmadığını araştırmaktadır. Yöntem: Araştırmaya 14-18 yaş aralığında olan 478 lise öğrencisi katılmıştır. Veri toplama aracı olarak; Sosyodemografik Bilgi Formu, Dijital Oyun Bağımlılığı Ölçeği (DOBÖ-7), Anne-Baba Tutum Ölçeği (ABTÖ) ve Bar-On Duygusal Zekâ Ölçeği Çocuk ve Ergen Formu (EQ-i (YV)) kullanılmıştır. Bulgular: Araştırma sonuçlarına gore yapılan regresyon analizi sonucunda, ergenlerin algıladığı kabul/ilgi alt boyutu ile duygusal zekâ düzeyleri arasındaki ilişkide dijital oyun bağımlılık düzeyinin kısmi aracı etkiye sahip olduğu bulunmuştur. Yapılan ANCOVA analizi sonucuna göre, demokratik ebeveyn tutumuna sahip ergenlerin duygusal zekâ seviyelerinin diğer tutumlara göre daha yüksek, otoriter ebeveyn tutumuna sahip ergenlerin duygusal zekâ düzeylerinin ise diğer ebeveyn tutumlarına göre daha düşük olduğu görülmüştür. Sonuç: Günümüz ebeveynleri için önemli bir sorun olarak görülen dijital oyun bağımlılığının kontrolünde ebeveyn tutumlarının ne derece önemli olduğunu gösteren bu araştırma, çocukların hayatlarına yön veren duygusal zekâ kapasitesinin ebeveyn tutumuyla olan ilişkisini değerlendirmek adına bir rehber özelliği taşımaktadır. Bulguların nesnel gerçekliği yansıtması açısından gelecek çalışmalar, araştırmamızın kısıtlılıklarını göz önünde bulundurarak planlanmalıdır.Yayın Adult lumbar scoliosis(Galenos, 2019-01) Sever, Cem; Erdem, Mehmet Nuri; Tezer, Mehmet; Erdem, GamzeScoliosis in the adult is a disorder that involves a convergence of deformity and degenerative disease in the spine. It can be defined as a coronal deformity with Cobb angle of more than 10 degrees in mature patients. The treatment of adult lumbar scoliosis deformity requires a multidisciplinary approach and preoperative planning, and to be extended to the development of new treatment methods in the future along with the expected life expectancy. It often manifests with low back pain. Etiology of the disease is related with primary degeneration or continuation of a deformity from adolescence. The main objective of surgical management is to decide which patient is to be treated with surgical treatment, to evaluate the general condition and to analyze the comorbidities of the patient and to draw a treatment scheme considering the patient’s expectations.Yayın A note on the cylindrical waves with transverse distortion in a plasma with vortex electron distribution(Işık University Press, 2020-01-20) Demiray, HilmiIn the present work, employing the conventional reductive perturbation method and the nonlinear field equations of a plasma consisting of a cold electron uid, hot electrons obeying a non-isothermal (trapped/vortex-like) distribution and station-ary ions with transverse distortion, we studied the propagation of nonlinear waves in such a plasma medium and obtained the modified CKP equation. Seeking a progressive wave solution to this evolution equation we obtained the exact analytical solution. It is observed that the speed of the solitary wave is directional dependent and the wave front is not circularly cylindrical surface any more.
