Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Uçurum, Metin(3)
- Elmalı, Kübra(2)
- Imamoglu, Ilyas Kays(2)
- Küçük Demir, Betül(2)
- Kılıç, Mehmet Akif(2)
- Pabuçcu, Hakan(2)
- Özdemir, Akın(2)
- Öztürk, Mesut(2)
- Aktan, Ceyda(1)
- Aktepe, Cemalettin(1)
- Apak, Ömer Ceyhun(1)
- Aras, Neriman(1)
- Aras, Selim(1)
- Arslan, Hakan(1)
- Atıcı, Ümit(1)
- Ayaz, Nurettin(1)
- Bayraktar, Hanefi(1)
- Başar, Sibel İsmailçebi(1)
- Başlar, Mehmet(1)
- Bilgin, Yusuf(1)
- Boyraz, Celal(1)
- Bozma, Gürkan(1)
- Bozma, Kübra(1)
- Büyüksevindik, Baki(1)
- Can, Zehra(1)
- Can, Ömer Sinan(1)
- Canbolat, Ahmet Serhan(1)
- Devecı, Fatma Gorgün(1)
- Engin, Mustafa Alptekin(1)
- Erer, Deniz(1)
- Erer, Elif(1)
- Ertugay, Mustafa Fatih(1)
- Etemoglu, Akin Burak(1)
- Etemoglu, Nagihan(1)
- Filiz, Tunahan(1)
- Gidik, Osman(1)
- Gülhan, Ünal(1)
- Gürgen, Ayşenur(1)
- Gıdık, Betül(1)
- Hırca, Tuğçe(1)
Yayınlar
- MakaleYalnız künye2021What are The Financial and Technologic Determinants of Cryptocurrency Prices? The Case of Bitcoin
Gülhan, Ünal; Temurlenk, Mehmet Sinan
Blockchain is distributed database provides encrypted transaction tracking. Similarly, Crypto money or cryptocurrency can be defined as digital currency or asset designed as alternative exchange tool, which uses cryptography to secure transactions based onblockchain database systematic is traded like cash. Moreover, without having central control system and authority, Bitcoin attracts investors more and more with this feature. In this context, the importance of this study may well explain factors affectingcryptocurrency prices in Bitcoin specific. It is used while choosing variables that determine Bitcoin prices, not only financial and economic factors, but also Bitcoin mining and Bitcoin Google Trend Index. While electricity unit costs from variables are included in model design; It is thought that electrical energy costs consumed by CPUs and GPUs of computers used by Bitcoin miners may have impact on Bitcoin prices In this study, bitcoin prices were modeled primarily with Box-Jenkins method with using between 2015-2020 daily data. In this study, it has been conducted with chosen control variables which are Gold unit prices, oil prices, Euro / Dollar parity, S&P 500 Index, LIBOR, Bitcoin Google Trend Index and electricity unit costs were determined as control variables and their effect on bitcoin prices was analyzed based on the Box-Jenkins model. Box-Jenkins modelling is chosen because this model has more power on forecasting future values with using AR and MA process together.
- MakaleAçık Erişim2021Organic Food Nutrition Knowledge Level of Olympic Boxers in Turkey
Kul, Murat; Gıdık, Betül; Şipal, Onur; Gidik, Osman; Şipal, Önder
One of the most important features of organic foods is that they are produced by organic farming methods, which is an environmentally friendly form of agricultural production. This study aims to determine the organic food awareness level and the perception of disadvantage towards organic food of all Olympic boxers in Turkey and attitudes towards organic food. The sample of the study consists of 29 volunteer athletes, 19 men, and 10 women, Olympic boxers in Turkey. It was ensured that the participants answered the demographic and scale questions in the survey via the internet. In the statistical evaluation of the data obtained from this study, the statistical software of SPSS 26.0 version; Cronbach's Alpha reliability, KruskalWallis H and Mann Whitney U tests were applied. In conclusion, a significant difference was determined between the organic food awareness level and attitudes towards organic foods and the national class variable at the level of P<0.05.
AtıfOpenAlex1TR Dizin1
İncele - MakaleAçık Erişim2020Bulanık İstatistiksel Proses Kontrol Tekniği ile 19x39x19 cm Bims Hafif Yapı Malzemesi Üretiminin Analizi
Uçurum, Metin; Kaplan Göztok, Kader; Özdemir, Akın
İstatistiksel Proses Kontrolü (İPK), üretim çıktılarının ürün özelliklerini belirlenen kalite aralıklarındayapılmasını kontrol eden, sağlayan ve standart dışı üretimin önüne geçmede mühendislerin kullandığı en önemlimatematik esaslı bir araçtır. Ancak konvansiyonel İPK yöntemlerinin yetersiz kaldığı durumlarda bulanık kümeteorisinden yararlanılan daha hassas istatistiksel proses kontrolüne imkân veren bulanık istatistiksel proseskontrol yaklaşımları geliştirilmiştir. Bu makalede, bir Bims fabrikası ürünü olan 19x39x19 cm Bims ürünününüretim sürecin kontrol altında olup olmadığının belirlenmesinde bulanık istatistiksel proses kontroltekniklerinden yararlanılarak elde edilen sonuçlar sunulmuştur.
AtıfOpenAlex2TR Dizin2İncele - MakaleAçık Erişim2020Sürekli Kalite İyileştirme için Faktöriyel Tasarım Tabanlı Süreç Optimizasyonu
Serencam, Hüseyın; Uçurum, Metin; Özdemir, Akın
Deneyin tasarımı, yeni bir süreç geliştirmek veya mevcut bir süreci geliştirmek için kilit bir rol oynar. Literatürde sürekli kalite iyileştirme için faktöriyel deneysel tasarımları kullanılmıştır. Bu makalede, tasarım faktörlerinin optimizasyonu için bir deney verisi analizi yapmak amacıyla faktöriyel deney tasarımına sahip yeni bir yöntem sunulmaktadır. Önerilen yöntem beş ana adıma sahiptir. İlk adım deney öncesi planlama ile ilgilidir. İkinci adım faktöriyel tasarıma sahip deneysel aşamadır. Üçüncü adım bir deneye ait verileri analiz eder. Daha sonra, tasarım faktörlerinin en uygun değerlerini elde etmek için faktöriyel tasarıma dayalı optimizasyon modeli ilk defa geliştirilmiştir. Son adım deneyden elde edilen sonuçları doğrulamak için sonuçlar ve tavsiyeler adımdır. Son olarak, güncel literatürdeki sayısal bir örnek için farklı hedef değerler kullanılarak karşılaştırma çalışmaları yapılmıştır. Ayrıca, önerilen faktöriyel tasarıma dayalı süreç optimizasyon modelinin belirtilen hedef değere göre daha fazla varyansı azaltabileceği sonucuna varılmıştır.
- MakaleAçık Erişim2020Investigation of Teacher Knowledge of Elementary Mathematics Teachers: Case of Probability
Öztürk, Mesut; Küçük Demir, Betül; Kılıç, Mehmet Akif
This study was conducted in order to examine the content knowledge ofmathematics teachers and to determine their views on probability issues. In thestudy, the case study model was used from the qualitative research designs. Theparticipants of the study were six elementary mathematics teachers who is Turkey'snorth-east province who served. Teachers participating in the study were selectedby quota sampling method. The criteria of the study were determined as teachers'masters and professional seniority. The data of the study were collected by semistructured interview form. In the form of semi-structured interviews, teachers wereasked questions of cognitive and affective questions related to the adequacy ofprobability information. Content analysis method was used in the data analysis.The results of the current study shows that the teachers considered the probabilitycontent knowledge is sufficient, but did not find the pedagogical contentknowledge sufficient. Another result of the study is that some teachers do not knowthe concept of discrete event and independent event. Therefore, teachers havedifficulty in distinguishing between discrete event and independent eventconcepts.
AtıfOpenAlex2TR Dizin1İncele - MakaleAçık Erişim2020Ranking alternative energy resources technology programsin turkey based on the methods of multi-criteria decisionmaking analysis
Teber, Ahmet; Karakaş, Ahmet
The diversity less among the Alternative Energy Resources Technology Programs (AERTPs) in Turkey makes giving the “proper” decision crucial by high school senior students. The literature review exhibits that there exists a need over the expectation for a ranking system of the two-year programs in vocational schools in Turkey so as identifying two-year programs compared to others. In this strategic decision context, it is especially important for the students to make a suitable decision associated with their higher education. Therefore, this study focuses on developing a specific ranking system of twoyear energy programs in Turkey. In order to classify the programs, the most important decision criteria should be required. In this aspect, a survey is applied to a hundred high school senior students to recognize which multi-criteria for selection of an energy program they pick. Thus, the survey makes this study is more applicable to build a foundation for a field-based ranking system in Turkey. In this regard, a framework for ranking of AERTPs during the academic year of 2019 in Turkey is accomplished using three methods of Multi-Criteria Decision Making Analysis including Analytic Hierarchy Process (AHP), Simple Multi-Attribute Rating Technique (SMART), and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS).
AtıfOpenAlex1İncele - MakaleYalnız künye2019Humility Scale Development Study
Büyüksevindik, Baki; Işık, Şerife
In this study, measuring instrument was developed to measure the strength of character humility. A qualitative research on humility was first made on 167 university students. Subsequently, pilot study was carried out after establishing a substance pool in the light of qualitative study findings and related field literature, taking the opinions and recommendations of field and language experts into consideration and making necessary corrections. In order to analyze the items of the Humility Scale and to reveal the factor structure, exploratory factor analysis was conducted through the collected data from 373 students. As a result of the factor analysis, it was decided that the scale was one-factor and in order to confirm the factor structure, confirmatory factor analysis was performed through the collected data from 302 students. Self-Esteem Inventory, Social Desirability Scale, Narcissistic Personality Inventory, and Beck Depression Inventory were used for the criterion- related validity of the scale. The internal consistency coefficient and the retest method were used for the reliability study of The Humility Scale. As a result of the analysis made, 5-point likert type Humility Scale, which consists of 9 items, was obtained. The results were discussed in the context of the literature and some suggestions were made
AtıfTR Dizin2İncele - MakaleAçık Erişim2018GG25 gri dökme demir malzemesinin üretiminde bulanık istatistiksel proses kontrolünün uygulanması
Uçurum, Metin; Atıcı, Ümit; Çınar, Mehmet; Çolak, Murat
Kimyasal bileşimlerinde %2'den fazla karbon içeren demirli malzemeler grubuna yaygın olarak dökme demir malzemeleri denir. Karbon Eşdeğeri (CE), dökme demir üretiminde kullanılan farklı alaşım elementlerinin kombine etkilerini eşdeğer miktarda karbon ile ilişkilendiren, ağırlık yüzdesi olarak ampirik bir değerdir. İstatistiksel proses kontrol (SPC), çok popüler hale gelen kaliteli ve yüksek standartlı ürünler elde etmek için fabrikalarda yaygın olarak uygulanmaktadır. Bulanık proses kontrol analizi, X-R kontrol çizelgelerini kullanarak, bulanık teori ile geliştirilmiş daha gerçekçi sonuçlar veren bir tekniktir. Bu çalışma, bir gri dökme demir üretim hattı koşullarının, şartname ve kontrol sınırları dâhilinde olup olmadığını bulanık istatistiksel proses kontrol tekniği ile gözlemlemek için gerçekleştirilmiştir. Bulanık X-R grafikleri, 20 günlük üretim için GG25 gri dökme demir numunelerine uygulanmıştır. Sonuçlar, bulanık istatistiksel proses kontrol (SPC) yöntemlerinin bir dökümhaneye basitçe uygulanabileceğini göstermektedir
AtıfOpenAlex2TR Dizin1İncele - MakaleAçık Erişim2018Vibration Analysis of a Cantilever Composite Beam by Equivalent MassSpring-Damper Systems
Uyar, Mehmet; Malgaca, Levent; Yavuz, Sahin; Karagülle, Hira
Composite materials are widely used in industrial structures such as manipulators because they are lightweight and durable. In this work, the vibration analysis of a cantilever composite beam with [0/90] lay-up was studied. An end point mass was added to the structure. An initial displacement was applied to the end point and the free vibration was analyzed experimentally first. Exponential decay was found. Natural frequencies were determined by taking the Fast Fourier Transform of the vibration signal. The system was analyzed in ANSYS and simulation results were obtained. The damping coefficient was determined by trial using the experimental exponential decay. An equivalent massspring-damper model (MSD) was established using static deflection, natural frequency and exponential decay obtained experimentally or by simulation. MSD-analytical results were obtained by the Laplace transform method. The experimental, simulation, and analytical results were compared for different end point initial displacement values. It was observed that the results are in good agreement.
AtıfOpenAlex2TR Dizin2İncele - MakaleAçık Erişim2018Application of statistical process control method to monitor wear and broken tooth faults in spur gears using vibration data
Arslan, Hakan; Maraş, Sinan
Gears are machine elements used extensively in many areas of industry to transmit power and motion. Damage occurs due to working under compulsive conditions effective gear fault detection is crucial to prevent greater drawbacks and economic losses. The objective of this study is to monitor the existence of different types of gear defects by examining changes in the vibrations of spur gears due to faults using vibrations analysis and statistical process control methods. For this purpose, a closed-loop test rig was constructed. Firstly, good gears were attached to the test assembly and vibrations data which received at radial direction via sensors on the bearings were recorded by operating the system at various loading and number of cycle’s conditions. Thus, a reference spectrum was obtained. Then the system was operated with artificial wear and fracture which were created on the surfaces of spur gears at various loading and number of cycles conditions. Vibrations data which were received from the bearings were recorded. These data were plotted on statistical control carts and frequency spectrum. Graphs of data obtained from good gears and defective gears were compared with each other. Thus it was possible to detect the existence of worn gear, one tooth broken pinion gear and one tooth broken from each pinion and wheel gears.
AtıfTR Dizin1İncele - MakaleYalnız künye2018Parametric Investigation on Thermal Performance of Vehicle Brake Systems
Etemoglu, Akin Burak; Canbolat, Ahmet Serhan; Türkan, Burak; Etemoglu, Nagihan
As a result of the sudden brake in vehicles, heating occurs in the disc brake systems. Especially, when high temperatures are reached, corrosion may occur in the brake pad. This situation affects the brake performance negatively. In this study, disc brake system model was built three-dimensionally in Comsol program and time dependent numerical simulations were made. Disc brake heating when sudden braking is applied was investigated for different vehicle velocities (80, 100 and 120 km/h). At the same time, the temperature increase during the braking process was determined for different disk materials (cast iron, stainless steel, carbon-carbon composites). Also, it has been determined whether the vehicle weight has an effect on the brake system. Finally, the effect of friction coefficient between disc and pad on the heating process was investigated numerically.
AtıfTR Dizin1İncele - MakaleYalnız künye2017Terör Olaylarının Finansal Piyasalar Üzerine Etkisi
Korkmaz, Özge; Erer, Elif; Erer, Deniz
Bu çalışmada, Türkiye'de meydana gelen terör olaylarının İstanbul Altın Borsası, BIST100 ve alt sektör endeks getirileri üzerindeki oynaklık etkisi incelenmiştir. Çalışmada, negatif ve pozitif olayların oynaklık üzerindeki etkilerinin farklı olması nedeniyle EGARCH ve GJR-GARCH modelleri kullanılmıştır. Çalışmanın sonucunda, Türkiye'de yaşanan terör olaylarının BIST 100, alt sektör ve İstanbul Altın Borsası endeks oynaklığı üzerinde istatistiksel olarak anlamlı bir etkiye sahip olmadığı görülmüştür. Ayrıca altın, hizmet ve teknoloji sektör endekslerinin sadece pozitif yönlü; sınai ve mali sektör endekslerinin ise hem negatif hem de pozitif yönlü haberlerden etkilendiği tespit edilmiştir
AtıfTR Dizin5İncele - MakaleYalnız künye2017Determinants Of Innovation: A Cross-Country Data Analysis
Pabuçcu, Hakan; Imamoglu, Ilyas Kays
In this study investigates, whether competitiveness, gross domestic product (GDP), labor market efficiency, patent applications and technology readiness level are the determinants of innovation by using regression analysis and the data belong to the countries examined in the global competitiveness report. In addition to regression analysis, by using the variables, that have a statistically significant relationship between innovation, it is constructed a neural network (NN) model. In both models, the results are consistent each other and NN model determined as the best to explain the ability of relationship between variables for innovation estimates. The relationship between innovation and other explanatory variable is statistically significant except patent application. The patent applications variable doesn't provide an assumptions related with statistical methods. It excluded from the analysis for this reason. The relationship between variables found positive as expected. But the coefficient of GDP is very low near zero, so the effect is very weak as surprisingly.
AtıfTR Dizin2İncele - MakaleYalnız künye2017Neural network data preprocessing: is it necessary for time series forecasting?
Pabuçcu, Hakan
Neural networks (NNs) are a commonly used method to solve the time series-forecasting problem. NNs have some advantages compared with traditional forecasting models, such as auto regressive moving average or auto regressive integrated moving average. NNs do not need to have any statistical assumption like normal distribution. However, data preprocessing, normalization, trend adjusting, seasonal adjusting, or both differencing can introduce better results in some studies. In this study, we have tried to investigate whether data preprocessing methods are useful for time series data, which contains trend, seasonality or unit root. For this purpose, we collected the real time series data belonging to monthly or quarterly observations and used nonlinear autoregressive (NAR) and multilayer perceptron (MLP) models. Although we obtained significant differences between data preprocessing methods, the structure of MLP with differenced variable produced the worst results
AtıfTR Dizin1İncele - MakaleYalnız künye2017The Effect of Argumentation Based Science Learning Approach on Probability Teaching
Can, Ömer Sinan; Küçük Demir, Betül; Isleyen, Tevfik
The aim of this study is to examine the effects of teaching probability functions with argumentation based science learning (ABSL) approach on the academic achievement of teacher candidates. The sample of the study included 44 students enrolled in the department of Elementary Mathematics Teaching of a university in 2014-2015 academic year. The model of this research is random figure pretest-posttest matched, with control groups. As a data collection tool, The Probability Achievement Test which is developed in order to measure the success of teacher candidates by the researchers was used. The collected data were analyzed by using SPSS program (Statistical Package for the Social Sciences). As a result of the research, the success’ of the experimental and control groups on the probability function increased. According to the results of The Probability Achievement Test conducted before the implementation, a significant difference was not found between academic achievements of the experimental and control groups, and a statistically significant difference between the academic achievements of the experimental and control groups was not found after the implementation
AtıfTR Dizin4İncele - MakaleYalnız künye2015Hisse senetlerinin fiyatları ile işlem hacimleri arasındaki ilişki: lojistik ve sivil havacılık sektörleri üzerine bir uygulama
Kutlu, Hüseyin Ali; Başar, Sibel İsmailçebi
Bu çalışmada Borsa İstanbul'da işlem gören lojistik ve sivil havacılık sektörlerine ait hisse senetlerinin fiyatları ile işlem hacimleri arasındaki ilişkiler ele alınmaktadır. Bu amaçla, önce Türkiye'de lojistik ve sivil havacılık sektörleri hakkında bilgiler verilmiş, daha sonra hisse senetlerinin fiyatları ile işlem hacimleri arasındaki ilişkileri izah etmeye çalışan teoriler hakkında bilgi verilmiştir. Borsa İstanbul'da işlem gören lojistik ve sivil havacılık sektörlerine ait hisse senbetlerinin fiyat ve işlem hacimleri arasındaki iilişkileri araştırmak amacıyla once nedensellik analizi sonuçları verilmiştir. Daha sonra static ve dinamik panel yöntemleri ile tahmin yapılmıştır. Hem static hem de dinamik panel model tahmin sonuçlarına gore Borsa İstanbul'da işlem gören lojistik ve sivil havacılık hisselerinin işlem hacimlerinin fiyatlarını etkilediği sonucuna varılmıştır
AtıfTR Dizin1İncele - MakaleYalnız künye2012Health services demand: A Study in Erzurum
Kaynak, Selahattin; Yaylali, Muammer; Karaca, Zeynep
The sector of health services is a sector with a high potential of improvement. Given that every individual is likely to come across health services and that the resources shared for health services constitute a high rate of the resources shared for social welfare and since it is a sector with high externalities, it is of great importance to research the demand for this sector. The aim of this study, in line with the importance of this sector, is to determine the factors affecting the demand for health services. For this purpose, we estimate a logit model of demand for health services with SPSS and LIMDEP package softwares using the survey data. Our analysis suggests that the probability of the consumers demand for health services is positively related to the income, age and the number of the individuals in a family. It is also found that the average of the group specific variables, i.e. the economic factors, the attitudes and behaviors of the medical officials and the physical environments of the hospitals are significantly different from the general average in statistical terms at 0.05 level of significance.
AtıfTR Dizin16İncele - MakaleYalnız künye2011Scopus SJRQ2Determination of protein and gluten quality-related parameters of wheat l our using near-infrared rel ectance spectroscopy (NIRS)
Ertugay, Mustafa Fatih; Başlar, Mehmet
Buğday ve un işleme teknolojisinde kalite/kontrol için yapılan kimyasal analizler oldukça zaman alıcıdır. Klasikmetotlara alternatif bir teknoloji olan yakın kızılötesi (NIR) spektroskopisi sonuçların birkaç saniyede elde edilmesinisağlar. Bu çalışmada, Türkiye’nin farklı bölgelerinden bir araya getirilen 120 çeşit buğday öğütüldü ve unlarda protein,yaş gluten, kuru gluten ve Zeleny sedimantasyon değerlerinin kalibrasyon modellerini geliştirmek için NIR spektrosko- pisi kullanıldı. Bunun için, monokromatör NIRSystem 6500 ile taranarak unların 1100 nm ile 2500 nm aralığındakispektraları elde edildi. Unların log 1/R’deki spektral verisi ile log 1/R’nin 1. ve 2. türevlerine Çoklu Lineer Regresyon(MLR) ve Kısmi En az Kareler (PLS) uygulandı. Protein, yaş gluten, kuru gluten ve Zeleny sedimantasyon parametreleriiçin korelasyonları sırasıyla r = 0.985, 0.976, 0.953 ve 0.924 olan sonuçlar geliştirildi.
AtıfTR Dizin2İncele