Ali ÖZEN

Makale/Derleme | 2023 | Anatolian Science Journal of Computer ScienceIDAP-2023 ( Special Issue ) , pp.11 - 18

In this article, the accomplishment of OFDM systems under different jamming attacks is analyzed. Partial band jamming signal suppressing OFDM data packets partially and full band jamming signal suppressing all OFDM data packets are examined in this study. Computer simulation works are carried out to analyze the achievement of the OFDM system over AWGN and frequency selective Rayleigh fading channels under both jamming attacks. In addition, comparative performance analysis of different equalizer structures in frequency selective Rayleigh fading channel environment is performed. From the obtained results, it is seen that frequency dom . . .ain equalizers combat jamming attack signals in the best way and provide the best performance Daha fazlası Daha az

Didem KAYA

Kitap Bölümü | 2023 | Kadın, Sağlık, Estetik , pp.140 - 166

Kitap Bölümü

Ceren AYDEMİR

Makale/Derleme | 2023 | İşletme Araştırmaları Dergisi15 ( 3 ) , pp.1574 - 1585

Amaç –Çalışanların gönüllü olarak sergiledikleri rol ötesi davranışlarını ifade eden örgütsel vatandaşlık davranışı (ÖVD) her zaman olumlu sonuçlar doğurmayabilir. Vatandaşlık yorgunluğu buradan hareketle ortaya çıkmış ve ulusal literatürde herhangi bir araştırmaya konu olmamış bir kavramdır. Bu araştırmanın amacı vatandaşlık yorgunluğunun işten ayrılma niyeti üzerindeki etkisinde örgütsel bağlılığın aracı rolünü incelemektir.Yöntem –Nicel araştırma yöntemlerinden ilişkisel tarama modelinin kullanıldığı bu araştırma farklı meslek gruplarından 210 çalışan ile gerçekleştirilmiştir. Araştırmada anket yöntemi kullanılmıştır. Hipotezler . . .Yapısal Eşitlik Modellemesi (YEM) ile test edilmiştir. Ayrıca frekans analizi, güvenilirlik analizi, korelasyon analizi, açıklayıcı faktör analizi, doğrulayıcı faktör analizlerinden yararlanılmıştır.Bulgular –Araştırma sonuçlarına göre vatandaşlık yorgunluğu işten ayrılma niyetini pozitif yönde anlamlı bir şekilde, vatandaşlık yorgunluğu örgütsel bağlılığı negatif yönde anlamlı bir şekilde, örgütsel bağlılık işten ayrılma niyetini negatif yönde anlamlı bir şekilde etkilemektedir. Ayrıca vatandaşlık yorgunluğunun işten ayrılma niyeti üzerindeki etkisinde örgütsel bağlılığın tam aracı role sahip olduğu tespit edilmiştir. Tartışma –Vatandaşlık yorgunluğu kavramı ulusal literatürde bir araştırma modeline dahil edilerek daha önce ele alınmadığı için ilgili bulgular benzer nitelikteki diğer bazı araştırmalarla kıyaslanmış ve uyumlu sonuçlar ortaya çıktığı görülmüştür. Dolayısıyla araştırmada vatandaşlık yorgunluğu kavramının ele alınmasının özellikle ulusal literatüre önemli ölçüde teorik ve pratik katkı sağlayacağı düşünülmektedir. Daha fazlası Daha az

Ceren AYDEMİR

Makale/Derleme | 2023 | Istanbul Gelisim University Journal of Social Sciences10 ( 1 ) , pp.262 - 275

Human resources-the most valuable resource of the economy- has the potential to make a big difference in the organization, environment and industry. These differences can be positive or negative. Job engagement is one of the factors that distinguish these differences from each other. The main purpose of this study is to determine the effect of job engagement on person-organization fit. In addition, it was examined the effects of the dimensions of job engagement on person-organization fit. The data of the research were collected from 330 bank employees in Kayseri. Quantitative research method was conducted and the data were obtained . . .by face-to-face technique. Job engagement was assessed through Utrecht Work Engagement Scale (UWES) by Schaufeli et al. (2002) and person-organization fit was assessed through the scale which have been developed by Netemeyer et al. (1997). The proposed hypotheses have been tested using the SPSS package program and reliability analysis, correlation analysis, and regression analysis conducted on data. As a result of the research, the job engagement has a significant effect on person-organization fit. Moreover, both vigor and dedication which are sub-dimensions of the job engagement have a significant effect on person-organization fit Daha fazlası Daha az

Ceren AYDEMİR

Makale/Derleme | 2023 | Anadolu Akademi Sosyal Bilimler Dergisi5 ( 1 ) , pp.62 - 70

Toplumsal hayatı şekillendiren ve birçok davranış üzerinde etkisi olan kültür örgütlerde de benzer şekilde örgütsel kültür adı altında kendini göstermektedir. Toplumlar gibi örgütler de kendi kültürlerini oluşturmaktadır. Örgüt içindeki iş yapma şekilleri, vizyon, misyon, iletişim, çalışanlar arası iş ilişkileri gibi birçok konu bu kültürün etkisiyle şekillenmektedir. Özellikle iletişim, iş yapma şekilleri ve örgüt içi ilişkiler gibi durumlar örgütsel yabancılaşmayı etkilemektedir. Dolayısıyla örgüt kültürünün ve örgütsel yabancılaşma kavramlarının birlikte incelenmesi önem arz etmektedir. Bu çalışmanın amacı örgüt kültürünün örgüts . . .el yabancılaşma üzerindeki etkisini incelemektir. Bu amaç kapsamında Kayseri’deki bir işletmenin 130 çalışanı ile araştırma gerçekleştirilmiştir. Araştırma sonuçlarına göre, örgüt kültürünün alt boyutlarından klan kültürünün örgütsel yabancılaşma üzerinde negatif yönlü anlamlı bir etkisi vardır. Diğer boyutlar kapsamında anlamlı etki tespit edilememişti Daha fazlası Daha az

Betül YILDIRIM

Makale/Derleme | 2023 | Computers & Industrial Engineering , pp.1 - 17

A relocation strategy repositions idle emergency service (ES) vehicles to prevent some demand points from being uncovered. In this study, we consider an ES system, such as natural gas emergency services system, which involves satisfying multiple-coverage requirements of demand points. This system uses a compliance table strategy that denotes the base stations of available ES vehicles depending on the system state. As different from the relocation literature, we allow multiple vehicle assignments to stations. Additionally, we categorize the system states as critical and non-critical. We proposed a mathematical model, which maximizes . . . the expected safely covered population to construct the compliance table. According to our results, the developed model opens fewer stations and provides better safe coverage. In order to help the dispatcher, who is mostly under pressure while making relocation decisions, we also introduced vehicle moves required for relocation into the compliance table. So the dispatcher can see the relocation plan and desired stations in the compliance table in advance. For this purpose, we present a network flow model and a heuristic approach to find the relocation plan for all emergency site cases. We performed a detailed simulation study, which also provided information about the performances of each vehicle. Accordingly, the proposed reloA relocation strategy repositions idle emergency service (ES) vehicles to prevent some demand points from being uncovered. In this study, we consider an ES system, such as natural gas emergency services system, which involves satisfying multiple-coverage requirements of demand points. This system uses a compliance table strategy that denotes the base stations of available ES vehicles depending on the system state. As different from the relocation literature, we allow multiple vehicle assignments to stations. Additionally, we categorize the system states as critical and non-critical. We proposed a mathematical model, which maximizes the expected safely covered population to construct the compliance table. According to our results, the developed model opens fewer stations and provides better safe coverage. In order to help the dispatcher, who is mostly under pressure while making relocation decisions, we also introduced vehicle moves required for relocation into the compliance table. So the dispatcher can see the relocation plan and desired stations in the compliance table in advance. For this purpose, we present a network flow model and a heuristic approach to find the relocation plan for all emergency site cases. We performed a detailed simulation study, which also provided information about the performances of each vehicle. Accordingly, the proposed relocation strategy is significantly better regarding response time related measures. cation strategy is significantly better regarding response time related measures. Daha fazlası Daha az

Ceren AYDEMİR

Kitap Bölümü | 2023 | İşletme Biliminin Üç Temel Alanında Yaşanan Gelişmeler: Muhasebe, Pazarlama ve Organizasyon , pp.147 - 153

Kitap Bölümü

Betül YILDIRIM

Bilimsel Araştırma Etkinlikleri | 2023 | RDCONF 2023 , pp.64 - 77

Doğal afetler afet merkezinde ya da merkeze yakın yerlerde pek çok insanı olumsuz etkilemektedir. Ülkemizin özellikle deprem ülkesi olması nedeniyle afet yönetiminin en doğru şekilde yapılması gerekmektedir. İl afet müdürlükleri tarafından belirlenen toplanma alanları da afetten etkilenen halkın geçici olarak toplanabileceği alanlardır. Bu çalışma kapsamında afet sonrasında halkın toplanması için oluşturulmuş toplanma alanlarının belirli bir sistematik ile belirlenmesi amaçlanmıştır. Çalışmada Kayseri ili Talas ilçesi uygulama alanı olarak seçilmiş ve mevcut toplanma alanlarının belirli kısıtlar altında belirlenmesi ve değerlendiril . . .ebilmesi için öncelikle literatürde toplanma alanları seçiminde kullanılan temel kriterler belirlenerek literatürdeki çalışmalar ve uzman görüşü dikkate alınarak AHP (Analitik Hiyerarşi Prosesi) yöntemiyle bu kriterler ağırlıklandırılmıştır. Elde edilen ağırlıklar elde mevcut sayısal veri bulunduğu için TOPSIS (İdeal Çözüme Benzerliğe Göre Sıralama Tekniği) yöntemine entegre edilmiş ve bu yöntemle mevcut toplanma alanlarının önem ağırlıkları belirlenmiştir. Daha sonra belirlenen bu ağırlıklar ile birlikte kapsanan nüfusu da maksimize edecek şekilde belirli kısıtlar altında matematiksel model geliştirilmiştir. Bu model karar vericiye eldeki mevcut toplanma alanlarını nasıl kullanması gerektiği konusunda bilgi vermekle birlikte belirli mesafe limiti ile ne kadar nüfusa hizmet edilebileceği ve bunun kaç toplanma alanıyla sağlanabileceği konusunda yardımcı olmaktadır. Bu durum afet sonrası toplanma alanlarının geçici barınma alanlarına dönüştürülmesi noktasında da karar vericiye öncelikli yerleri belirleyebilme noktasında yardımcı olacaktır. Çalışmada, parametre değerlerine bağlı değişen sonuçlar için detaylı analizler sunulmuştur Daha fazlası Daha az

Gizem Aytekin Şahin

Makale/Derleme | 2023 | Nutrition and Food Scienceearly access ( early access ) , pp.1 - 15

Purpose This study aims to evaluate the nutrient profile, carbon footprint and water footprint of one-month menus presented in five hospitals in Turkey and compare their environmental impacts with that of the Mediterranean diet. Design/methodology/approach The energy and nutrient content of menus were compared with recommendations of the Turkey Dietary Guidelines (TUBER) 2022. Nutrient profiles of hospital menus were evaluated using Nutrient Rich Food 9.3 (NRF 9.3) and SAIN-LIM models. The carbon and water footprints of the menus were calculated and compared with those of the Mediterranean diet. Findings Menus’ energy and nutrient c . . .ontent did not conform with TUBER 2022. The SAIN-LIM score of Hospital A (5.7 ± 1.1) was significantly higher than that of Hospitals C (4.8 ± 0.7, p = 0.001) and E (5.1 ± 0.7, p = 0.025). The carbon footprint of Hospital A was significantly lower (2.6 ± 0.3 kg CO2 eq/person/day) and that of Hospital D (4 ± 0.9 kg CO2 eq/person/day) was significantly higher than those of others (p < 0.001). While other menus were similar (p > 0.05), the water footprint of Hospital A was significantly lower (3.5 ± 0.7 L/kg, p < 0.001). In addition, if the menus were suitable for the Mediterranean diet, a reduction of 2.2–23.4% in the carbon footprint and 37.5–58.6% in the water footprint could be achieved. Moreover, menus’ carbon and water footprints were negatively correlated with NRF 9.3 and SAIN-LIM scores. Research limitations/implications The primary aim should be to ensure that the planned menus follow the dietary guidelines. In addition, it is an undeniable fact that sustainable nutrition is a complex process with many dimensions. However, it seems possible to improve the nutrient profiles of the menus and reduce their environmental footprint with minor changes to be made in food services. Practical implications It seems possible to improve the nutrient profiles of the menus and reduce their environmental footprint with minor changes. For both health and environmental impacts, food services should switch to menus suitable for the Mediterranean diet. Originality/value The findings provide new insights into hospital menus’ quality and environmental impact Daha fazlası Daha az

Gizem Aytekin Şahin

Makale/Derleme | 2023 | British Food Journal125 ( 3 ) , pp.1054 - 1066

Purpose There are many studies investigating people’s eating habits during the COVID-19 period, and people have been encouraged to eat healthier. Healthy nutrition is made possible by making healthy food choices and food labels are one of the tools that help consumers make healthy food choices. Therefore, the primary aim of this study was to evaluate the impact of the COVID-19 pandemic on consumers’ food label reading behaviours and their level of trust in food labels. Design/methodology/approach This cross-sectional study was conducted on 1,012 adults aged 18–65 years from seven different regions of Turkey. Participants’ food label . . . reading behaviours and their trust in food label information were assessed using an online questionnaire, and COVID-19 fear scores were determined using the fear of COVID-19 scale (FCV-19S). Findings Although not statistically significant, participants’ rate of reading food labels increased during the pandemic (65.6% vs 68.7%, p = 0.078). On the contrary, trust in label information decreased significantly (52.1% vs 43.9%, p < 0.001). In addition, increased COVID-19 fear was associated with an increased rate of food label reading and decreased trust in the label information (p < 0.001). Research limitations/implications Because of the study’s cross-sectional nature, the authors cannot provide a causal link between COVID-19 fear and food label reading behaviours and trust in food label information. However, it is difficult to investigate this causal link due to difficulties in studies of consumer behaviour and food choice (e.g. multifactorial effects and complexity). Second, because the present study’s findings were based on self-report data, there may be a risk of resource bias. Nevertheless, the authors think that this study will shed light on future studies as it is the first time that the COVID-19 pandemic has investigated consumers’ food label reading habits and their trust in food labels. Practical implications Considering the pandemic as an opportunity to change consumer behaviour, it may be useful to provide food label reading education to consumers, especially during this period. In addition, the information given on the label should be clear and understandable for a better understanding of the food label information. Furthermore, it may be beneficial to conduct food inspections more frequently and share the results with the public to increase consumers’ trust in food labels. Moreover, as the food system shifts towards a “new normal”, it is critical for policymakers to understand the changes in consumer perceptions, preferences and trust in foods. Originality/value COVID-19 fear affected consumers’ food label reading behaviours. As far as the authors know, there is no study about the effects of COVID-19 on consumers’ food label reading behaviours Daha fazlası Daha az

Hikmetnur DANIŞMAN

Makale/Derleme | 2023 | Orthodontics and Craniofacial Research ( 26 ) , pp.123 - 131

Objectives: To compare the skeletal and dental effects of different types of rapid maxillary expansion (RME) appliances using cone-beam computed tomography (CBCT). Materials/methods: This multi-centre study was conducted with a total of 56 patients. The sample consisted of two groups including the McNamara-Type RME (MNR) group with 30 patients (16 females, 14 males, mean age: 13.38 ± 1.16 years) and Full-Coverage RME (FCR) group with 26 patients (10 females, 16 males, mean age:13.78 ± 1.06 years). Twenty-one parameters were measured on CBCT images including 4 maxillary skeletal, 12 maxillary alveolar, and 5 maxillary dental measurem . . .ents, and the data were analysed using the SPSS 20.0 software. Results: The rates of increase in the palatal maxillary width (PMW) (3), PMW(4), and PMW(6) were significantly higher in the MNR group (P < .05). While the rates of increase in the buccal maxillary width (BMW) (3) and BMW(4) were statistically higher in the MNR group, the rate of increase in BMW (6) was higher in the FCR group (P < .05). The increases in HPW (4), HPW (6), PAA4(°), and PAA6(°), which are parameters about hard palate width (HPW) and palatal alveolar angle (PAA), were also significantly higher in the MNR group (P < .05). The increases in PAW (4) and PAW (6), referring to the widths between the palatal root apices were significantly higher in the MNR group (P < .05).The increase in Slope-6(°) was also higher in the MNR group (P < .05). Conclusion: Expansion in the palatal region on the alveolar level was higher in MNR than in FCR, while expansion in FCR was the highest in the posterior. In both appliances, there was tipping in the buccal direction in both alveolar bone and teeth, and the rate of this tipping was higher in MNR Daha fazlası Daha az

Hikmetnur DANIŞMAN

Makale/Derleme | 2023 | CLINICAL AND INVESTIGATIVE ORTHODONTICS 82 ( 4 ) , pp.194 - 203

Purpose: The aim of this investigation was to evaluate the reliability and accuracy of cephalo-metric measurements of the web-based artificial intelligence cephalometric analysis platform in comparison with the computer assisted cephalometric analysis method.Materials and Methods: 60 patients’ pretreatment lateral cephalograms were randomly selected. A total of 21 landmarks were identified by one operator and a total of 20 parameters were measured both AI based platform WebCeph® and Dolphin Imaging®. Measurements of AI landmarking were recorded. Then, the landmarks placed automatically by the AI (AI land-marking) were corrected manu . . .ally (manual landmarking). All the measurements were recorded and performed once more after 4-weeks. Correlation between repeated measurements was evaluated by using the Pearson correlation coefficient. Paired t-test was used for comparisons between groups.Results: Most of the measurements showed statistically significant differences between AI landmarking and manual landmarking 1, except for the angular measurements of the U1-SNº (P = 0.717), interinsizal angle (P = 0.410), and L1-NBº (P = 0,295). Most of the measurements were found to be statistically similar between manual landmarking 1 and manual landmarking 2, except for the angular measurement of the SN-GoGnº, IMPAº, linear measurements ANS-Me. The Pearson correlation coefficients of all cephalometric measurements were above 0.80.Conclusions: All mean differences between the manual landmarking 1 and AI landmarking measurements were less than 2 degrees/2 mm, except for the nasolabial angle. Although WebCeph’s artificial intelligence algorithm is not sufficient to accurately determine the position of soft tissue landmarks, it becomes more suitable for clinical use with the control and manual correction of landmarks by observers Daha fazlası Daha az