TR-Dizin İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12573/396

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Citation - WoS: 1
GIS-AHP Approach for a Comprehensive Framework to Determine the Suitable Regions for Geothermal Power Plants in Izmir, Turkiye
(Konya Teknik Univ, 2024) Koca, Kemal; Karipoglu, Fatih; Ozturk, Emel Zeray
Geothermal energy is gaining more reputation and importance around the world. Correspondingly, suitable location selection is a critical step and has become necessary for the successful installation and operation of geothermal power plants. This study investigated suitability of & Idot;zmir region, located in the Aegean part of T & uuml;rkiye, in terms of geothermal power plants applications by using the combination of Geographical Information System and Analytic Hierarchy Process. Based on the request of power plants, thirteen important criteria were evaluated under three main categories named as physical (C1), environmental (C2) and technical (C3). Moreover, expert's opinions were taken into consideration to calculate the importance of these criteria. Key results showed that & Idot;zmir was suitable for geothermal power plants. The final suitability map layer pointed out that %8.73 (1.037 km2) of total area were determined as highly suitable regions in terms of installation. In addition, the obtained suitability map layer was compared with actual geothermal power plants. Based on the comparison study, power plants in Seferihisar were moderately suitable for geothermal power plants while the location of Bal & ccedil;ova power plant was highly suitable. Regarding the suitability assessment in the present study, the location of Dikili power plants had the least suitability score.
Apatinib Sensitizes Human Breast Cancer Cells Against Navitoclax and Venetoclax Despite Up-Regulated Bcl-2 and Mcl-1 Gene Expressions
(Kare Publ, 2021) Kavakcioglu Yardimci, Berna; Ozgun Acar, Ozden; Semiz, Asli; Sen, Alaattin
OBJECTIVE Defects in apoptotic cell death which restrict the success of conventional cytotoxic therapies have pivotal roles in a number of pathological conditions including cancer. However, a novel drug class targeting pro-survival Bcl-2 protein family members has been developed with the understanding of the structures and interactions of Bcl-2 proteins. Within this new class, Bcl-2/Bcl-xL inhibitor Navitoclax and Bcl-2 specific inhibitor Venetoclax have been shown to demonstrate strong anticancer activities on several types of cancers. But their low affinity to other anti-apoptotic proteins limits their clinical usage. Here, we investigated the cytotoxic and apoptotic effects of Navitoclax/Venetoclax and their combinations with specific tyrosine kinase inhibitor Apatinib on estrogen receptor (ER)-positive MCF-7 and ER-negative MDA-MB-231 breast cancer cell lines. METHODS MTT assay was used for the evaluation of the inhibition of cancer cell proliferation. ELISA test and Quantitative real-time PCR assay was performed to determine the role of caspase-3, Bak, Bax, Bcl-2, Bcl-xL and Mcl-1 proteins in the inhibition of cell proliferation triggered by the tested agents. RESULTS We found that aggressive MDA-MB-231 cell line was more sensitive to all tested agents. Apatinib significantly enhanced Navitoclax/Venetoclax mediated inhibition of cell viability in both cancer cell lines despite up-regulation in the expression levels of Bcl-2 and Mcl-1 genes. We further demonstrated significant Bak/Bax and caspase-3 expression in less aggressive MCF-7 cells. CONCLUSION Our findings have impacts on Navitoclax/Venetoclax plus Apatinib based therapy for breast adenocarcinoma. On the other hand, further studies should be conducted to elucidate the mechanisms underlying synergistic effects of Navitoclax/Venetoclax plus Apatinib combinations.
Real-Effort Tasks in Laboratory Experiments
(Economic and Financial Research Assoc - Efad, 2023) Demirtas, Burak Kagan
Laboratory experiments used in economics are differentiated in terms of many technical features. One of these technical features is whether the experiment involves a real-effort task. A real-effort task can be defined as a task in which the experiment participants work on aAreal job during the experiment, spend time and effort, determine their performance level and as a result earn a certain amount of money. This study aims to examine real-effort tasks that are frequently used in experimental economics studies, and to discuss potential problems that researchers may face when conducting experiments with real- effort tasks. Within the scope of this review, real-effort tasks commonly used in the literature are categorized under four groups: real-effort tasks based on mathematical operations, puzzles, slider task, and word encryption tasks. Choice of the real-effort task is important for an experimental study because it may lead to misinterpretation of the findings. AAsAa result of the study, the learning effect, the boredom of the task and the abilities required by the task are seen as possible sources of measurement error. While the learning effect and boredom may cause problems especially in within-subject designs, it was found that differences in the abilities of participants may cause measurement errors especially in between-subject designs.
Tracing Trajectories of Regime Support in Turkey
(Ege Univ, Fac Economics & Admin Sciences, 2022) Inan, Murat
According to the legitimacy approach of political culture research, public's approval of a particular regime as the best form of government and rejection of its alternatives provides public support for that particular regime. This research attempted to trace temporal trajectories of approval of democratic political system as well as it's three alternative forms of government among the electorates of recent three major political parties in Turkey, the Justice and Development Party (AKP), the Republican People's Party (CHP) and the Nationalist Movement Party (MHP). It also revealed the extent these parties' manifesto documents praise democratic political system across the successive eighteen general elections in the modern Turkish political history. It revealed the changes in both public and party support for four alternative regimes across years in modern Turkish history. This research analyzed the World Values Survey and the Manifesto Project data using quantitative research methods. It has achieved four main findings. First, voters are more stable than their parties across time in terms of pro-democracy. Second, democracy clearly emerges as the strongest alternative among the four alternative regimes for all the three electorates. Third, supporting democracy and rejecting its three alternatives occupy different places in the minds of the three party electorates. Fourth, changes in the three political parties' pro-democracy as identified in their manifesto documents are not always parallel with changes in those of their voters.
Değişen Yükseköğretim Sistemini Sosyokültürel ve Mekânsal Bağlamlarda Yeniden Düşünmek
(DEOMED PUBL, ISTANBUL, GUR SOK 7-B, FIKIRTEPE 34720 KADIKOY, ISTANBUL, 00000, TURKEY, 2020) Ayten, Asim Mustafa; Gover, Ibrahim Hakan
Education and research are vital for social development and progress. The changing sociocultural structures and new needs have resulted in some important functional changes in higher education systems with a deep impact on universities serving these needs at the highest level. Besides experiencing these functional changes, the universities today have become spaces of socialization with their social, cultural and sports facilities, replacing their traditional spatial role of offering education only. The local dynamics changing with globalization have now reshaped the global and local roles of universities, highlighting the added value they provide to the society. Sociocultural changes trigger all these functional and structural changes in universities. Therefore, sociocultural factors and their importance should not be ignored in a changing higher education system. In this study, the impact of sociocultural factors with their related spatial structures on world higher education system will be analyzed within their historical contexts, and some suggestions for future universities will be offered considering the current changes. In the first part of the study, the changes in societies and universities will be presented within the historical context. In the second part, the spatial forms and structures of universities will be discussed. In the third part, the catalytic effects of the specific sociocultural factors will be highlighted and elaborated on. Finally, some suggestions will be made for the universities of the future in the light of the current situation and the data available.
Citation - WoS: 2
Reconsidering the Changing Higher Education System from Sociocultural and Spatial Perspectives
(Deomed Publ, Istanbul, 2020) Ayten, Asim Mustafa; Gover, Ibrahim Hakan
Education and research are vital for social development and progress. The changing sociocultural structures and new needs have resulted in some important functional changes in higher education systems with a deep impact on universities serving these needs at the highest level. Besides experiencing these functional changes, the universities today have become spaces of socialization with their social, cultural and sports facilities, replacing their traditional spatial role of offering education only. The local dynamics changing with globalization have now reshaped the global and local roles of universities, highlighting the added value they provide to the society. Sociocultural changes trigger all these functional and structural changes in universities. Therefore, sociocultural factors and their importance should not be ignored in a changing higher education system. In this study, the impact of sociocultural factors with their related spatial structures on world higher education system will be analyzed within their historical contexts, and some suggestions for future universities will be offered considering the current changes. In the first part of the study, the changes in societies and universities will be presented within the historical context. In the second part, the spatial forms and structures of universities will be discussed. In the third part, the catalytic effects of the specific sociocultural factors will be highlighted and elaborated on. Finally, some suggestions will be made for the universities of the future in the light of the current situation and the data available.
Citation - WoS: 1
Machine Learning Based Network Intrusion Detection With Hybrid Frequent Item Set Mining
(Gazi Univ, 2024) Firat, Murat; Bakal, Gokhan; Akbas, Ayhan
With the development and expansion of computer networks day by day and the diversity of software developed, the damage that possible attacks can cause is increasing beyond the predictions. Intrusion Detection Systems (STS/IDS) are one of the practical defense tools against these potential attacks that are constantly growing and diversifying. Thus, one of the emerging methods among researchers is to train these systems with various artificial intelligence methods to detect subsequent attacks in real time and take the necessary precautions. However, the ultimate goal is to propose a hybrid feature selection approach to improve the classification performance. The raw dataset originally enclosed 85 descriptor features (attributes) for classification. These attributes are extracted using CICFlowMeter from a PCAP file where network traffic is recorded for data curation. In this study, classical feature selection methods and frequent item set mining approaches were employed in feature selection for constructing a hybrid model. We aimed to examine the effect of the proposed hybrid feature selection approach on the classification task for the network traffic data containing ordinary and attack records. The outcomes demonstrate that the proposed method gained nearly 3% improvement when applied with the Logistic Regression algorithm on classifying more than 225,000 records.
Citation - WoS: 3
Combined Effect of Midostaurin and Sphingosine Kinase-1 Inhibitor on FMS-Like Tyrosine Kinase 3 (FLT3) Wild Type Acute Myeloid Leukemia Cells
(Walter de Gruyter Gmbh, 2022) Sahin, Hande Nur; Adan, Aysun
Objectives Therapeutic potential of clinically approved FLT3 inhibitor midostaurin has been neglected in wild-type FLT3 positive acute myeloid leukemia (AML). Sphingosine kinase-1 (SK-1) having anti-proliferative functions is studied in various cancers, but not in FLT3 wild-type AML. We aimed to develop new therapeutic strategies to combat FLT3 wild-type AML by combining midostaurin with SK-1 inhibitor (SKI II) in THP1 cells. Methods The anti-proliferative effects of midostaurin, SKI II and in combination on THP1 cells were determined by MTT assay. The combination indexes were calculated using calcusyn software. SK-1 expression and PARP cleavage were checked by western blot. Cell cycle distributions (PI staining) and apoptosis (annexin-V/PI dual staining) were assessed by flow cytometry for each agent alone and in combinations. Results Midostaurin decreased SK-1 protein level. Midostaurin, SKI II and certain combinations decreased cell viability in a dose dependent manner. The combined anti-leukemic effects of the aforementioned drug combination afforded additive effect. Co-administration induced both necrosis and apoptosis via phosphatidylserine externalization, PARP cleavage and cell cycle arrest at G0/G1 and S phases. Conclusions Targeting sphingosine kinase-1 together with FLT3 inhibition could be a novel mechanism to increase limited clinic response to midostaurin in wild-type FLT3 overexpressing AML after further pre-clinical studies.
Cytotoxic and Cytostatic Effects of Targeting mTOR and Hedgehog Pathways in Acute Myeloid Leukemia
(Istanbul Univ, 2022) Cicek, Enes; Kucuktas, Fulya Mina; Yenigul, Munevver; Akcok, Emel Basak Gencer
Objectives: Acute myeloid leukemia (AML) is a highly aggressive heterogeneous hematopoietic malignancy characterized by a rapid and abnormal proliferation of immature myeloid leukemia cells in the bone marrow and peripheral blood. Aberrant alterations in signal transduction pathways are strongly associated with the progression of AML. This study aimed to investigate cell viability and the cell cycle in AML cells by targeting the Hedgehog and mTOR signaling pathways with rapamycin and GANT61. Materials and Method: The antiproliferative effect of rapamycin and GANT61 was assessed by the MTT cell viability assay in two AML cell lines: CMK and MOLM-13. The effect of the inhibitors on cell-cycle distribution was determined using propidium iodide staining and measured with flow cytometry. Results: Rapamycin, an mTOR inhibitor, and GANT61, a Gli-1 inhibitor, decreased the cell proliferation of CMK and MOLM-13 cells. The IC20 values, which is the drug concentration that inhibits cell growth by 20%, were combined and administered to the cells. The results show the drugs to have a combinatorial inhibitory effect on CMK cells but not on MOLM-13 cells. In addition, the combination of drugs arrested the cells during the G0/G1 phase. Conclusion: This study suggests a novel combination therapy approach for AML via mTOR and Hedgehog signaling pathway inhibition using rapamycin and GANT61, respectively. It also suggest further studies be performed to reveal the mechanism of action.
Citation - WoS: 4
Relationship Between Neutrophil Gelatinase-Associated Lipocalin and Mortality in Acute Kidney Injury
(Galenos Yayincilik, 2018) Kayaalti, Selda; Kayaalti, Omer; Aksebzeci, Bekir Hakan
Objective: Almost half of intensive care patients are affected by acute kidney injury (AKI). The purpose of this study is to determine parameters that can be used for predicting of early (within 28 days) and late (within 90 days) mortality in patients who are followed-up with AKI in intensive care units. Materials and Methods: In this study, a dataset that contains 50 patients with AKI in intensive care units was used. This dataset contains blood urea nitrogen, creatinine, plasma and urinary neutrophil gelatinase-associated hpocalin (NGAL), lactate dehydrogenase, alkaline phosphatase and gammaglutamyl transpeptidase values of patients who were admitted to intensive care for various reasons and who developed AKI on the days 1, 3 and 7. In addition to these values, laboratory results such as serum electrolytes on day 1, blood gas; vital signs such as mean arterial pressure, central venous pressure; and demographic data were also recorded. Data mining techniques were applied to determine correlation between all of these data and mortality. Results: The threshold level of urinary NGAL on day 7 was determined to be 69 ng/mL, and strong correlation was found between this threshold level and early mortality. Similarly, the threshold level of plasma NGAL on day 7 was determined to be 150 ng/mL, and this was highly correlated with early mortality. Besides, strong correlation was also found between the difference in the urinary NGAL levels on day 1 and 7, and early mortality. Conclusion: In this study, plasma and urinary NGAL levels were found to be closely related to early mortality in patients who were followed-up with AKI in intensive care units. On the other hand, any parameter associated with late mortality was not found.
İnşaat Atıklarının Yeraltı Madeni Üretim Boşluklarında Dolgu Malzemesi Olarak Kullanımı
(2019) Yılmaz, Ayşe Tekin; Cihangir, Ferdi; Erçıkdı, Bayram
Bu çalışmada sülfürlü atık yerine ikame olarak %10, %30 ve %50 oranlarında inşaat atığı (İA)kullanılarak hazırlanan çimentolu macun dolgu (ÇMD) numunelerinin 3-28 gün boyunca tek eksenlibasınç dayanımı (TEBD) ve 28 gün sonunda porozite (MIP) testleri yapılarak İA’nın macun dolgumalzemesi olarak kullanımı araştırılmıştır. Kontrol numuneleri %7,5 ve %8,5 bağlayıcı oranındahazırlanırken, İA ikameli ÇMD numuneleri %7,5 çimento oranında hazırlanmıştır. Bulgular, %10 İAikameli ÇMD numunelerinin %7,5 ve %8,5 bağlayıcı oranında hazırlanan kontrol numunelerine kıyasladaha yüksek TEBD ve daha düşük porozite üretirken, daha yüksek oranlarda (%30-50) İA kullanımınındolgunun dayanım ve mikroyapı performansını olumsuz etkilediğini göstermiştir. Ayrıca, 1,0 m3 ÇMDüretiminde bağlayıcı oranı %7,5’e düşürülüp atık malzeme yerine %10 İA ikame edildiğinde %13,22oranında bağlayıcı tasarrufu sağlanmıştır. Sonuç olarak, İA’nın yeraltı üretim boşluklarında ÇMDmalzemesi olarak kullanılabileceği ve yerüstünde oluşabilecek toz, görüntü kirliliği ve depolama alanıyetersizliği vb. problemlerin ortadan kaldırılabileceği/azaltılabileceği öngörülmüştür.
Citation - WoS: 1
Assessment of Installed Power for Inclined Belt Conveyors Using Genetic Algorithm and Artificial Neural Networks
(Konya Teknik Univ, 2022) Koken, Ekin
In this study, the installed power (P inst , kW) of several inclined belt conveyors operating in the mining industry of Turkey was investigated through two soft computing algorithms (i.e., genetic expression programming (GEP) and artificial neural networks (ANN)). For this purpose, the most crucial belt (i.e., belt length (L), belt width (W), belt inclination (alpha)), operational (i.e., belt speed (Vb) b ) and throughput (Q)) and infrastructural (belt weight (Wb) b ) and idler weight (Wid)) id )) features of 42 belt conveyors were collected for each investigated belt conveyor. The collected data was transformed into a comprehensive dataset for soft computing analyses. Based on the GEP and ANN analyses, two robust predictive models were proposed to estimate the P inst . The performance of the proposed models was evaluated using several statistical indicators, and the statistical evaluations demonstrated that the models yielded a correlation of determination (R2) 2 ) greater than 0.95. Nevertheless, the ANN-based model has slightly overperformed in predicting the P inst values. In conclusion, the proposed models can be reliably used to estimate the P inst for the investigated conveyor belts. In addition, the mathematical expressions of the proposed models were given in the present study to let users implement them more efficiently.
Performance Evaluation of Energy Companies With a Novel Integrated Multi- Criteria Decision Making Method
(Kafkas University Iibf, 2022) Madenoglu, Fatma Selen; Unlusoy, Omer Faruk; Yilmaz, Cagatay
Financial statements are an important tool for assessing and analyzing an organization's financial performance. Financial performance analysis allows for an accurate and appropriate appraisal of an organization's performance. The evaluation procedure must be thoroughly stated because financial performance indicators represent a company's competitiveness. This study provides a novel integrated multi-criteria decision-making method for analyzing an organization's financial performance. The applicability of the proposed method is assessed employing financial ratios that are integrated to generate a financial performance score for eight well-known Turkish energy companies. The criteria are weighted using the entropy method in the proposed method. The multi- attributive border approximation area comparison (MABAC) method is used to rank the companies. As the weights of the criteria have an impact on the ranking outcomes, a sensitivity analysis of the weights is performed. We also exhibit a comparison analysis of energy company rankings to validate the proposed approach's results using four MCDM methods: ELECTRE, MAUT, TOPSIS, and WASPAS. In addition, an alternative weighting method is also used to evaluate the results. The results show that the proposed method is an effective MCDM for coping with evaluation problems.
Vergi Uyumu Davranışı ve Laboratuvar Deneyleri: Bir Yazın Taraması
(Hazine ve Maliye Bakanlığı, 2021) Demirtaş, Burak Kağan
Bu makalenin amacı, bireylerin vergi kaçırma davranışlarını analiz_x000D_ etmek için yürütülen laboratuvar deneylerine dayalı yayınların bir yazın_x000D_ taramasını yapmaktır. İktisat biliminde deneysel çalışmalar gün geçtikçe_x000D_ önem kazanırken Türkçe İktisat yazınında deneysel çalışmalar yok denecek_x000D_ kadar azdır. Bu makalede yazında bulunan çalışmalar özellikle deneysel_x000D_ tasarım açısından incelenmektedir; zira bu makale, laboratuvar deneyleriyle_x000D_ ilgili farkındalığı artırmayı da hedeflemektedir. Çalışmada mümkün_x000D_ olduğunca farklı deneysel tasarımlara dayanan çalışmalar tercih edilmeye_x000D_ çalışılmıştır. Ayrıca laboratuvar deneylerine getirilen eleştiriler de_x000D_ tartışılmaktadır. Makale, laboratuvar deneylerinden elde edilen sonuçların_x000D_ önemli olduğu ve saha deneyleri ile desteklenmesinin faydalı olacağı_x000D_ sonucuna varmaktadır.
Citation - WoS: 1
Re-Visiting Ambivalent Sexism Inventory (ASI): Construct Validity of Benevolent Sexism and Measurement Invariance of ASI
(Istanbul Univ, Fac Letters, dept Psychology, 2022) Aktan, Timucin; Yalcindag, Bilge
The ambivalent sexism theory states that sexism comprises hostile and benevolent beliefs and that benevolent sexism is a second-order factor consisting of protective paternalism, complementary gender differentiation and heterosexual intimacy. The subdimensions of benevolent sexism toward women have recently piqued people's interest. The Turkish version of the ambivalent sexism inventory's (ASI's) construct validity should be reexamined in light of this apparent interest in contemporary studies. Accordingly, in the current study, the aim is to test the preferred structural model in which protective sexism was defined as a second-order factor consisting of protective patriarchy, complementary differentiation between genders and heterosexual intimacy. Moreover, measurement invariance analysis will be used to test the stability of the scale's structure in different samples. The data of 1803 participants from different studies conducted between 2009 and 2019 (1194 women and 593 men, 16 unidentified) were merged. Findings of the confirmatory factor analyses indicated that the four-factor solution (i.e. hostile sexism and three subfactors of benevolence) fitted the data better than the other models (i.e. one-factor and two-factor models, and the preferred structural model). Explanatory factor analysis via exploratory structural equation modeling revealed a two-factor solution composed of benevolence and hostility, but the findings also underlined two psychometrically weak items. Finally, measurement invariance analyses demonstrated full invariance between private and public university samples, and an invariance between women and men samples except for sample means. Only the means of the samples differed in the women-men comparison, but in a theoretically predicted way, and men had higher scores in all subscales except for complementary gender differentiation. In sum, our findings provided significant support for the construct validity and measurement invariance of ASI while raising questions about the theoretical construct measured and the items needed to be revised.
Citation - WoS: 2
Citation - Scopus: 2
The Nexus of Leadership, Political Empowerment, and Social Mobilization: The Case of the July 15 Coup Attempt in Turkey
(Seta Foundation, 2020) Donmez, Rasim Ozgur; Timur, Kasim; Lloyd, Fatma Armagan Teke
This study analyzes the mutually empowering relations between Turkish President Recep Tayyip Erdogan and his followers, and how Erdogan's charismatic leadership and image functioned to galvanize his followers on the night of July 15, 2016, when large numbers of them mobilized against the attempted coup. The article has three sections. The first is a theoretical discussion which sheds light on the concept and the underlying mechanisms of political empowerment and its effects on the relationships between leaders and followers. The second section evaluates Erdogan's characteristics and ruling style, which was instrumental in motivating resistance to the abortive coup. Finally, the third section analyzes the various means by which Erdogan was able to inspire the masses to mobilize against the armed junta through interviews and observations.
Citation - WoS: 1
Citation - Scopus: 1
The Comparison of Fragility Curves of Moment-Resisting and Braced Frames Used in Steel Structures Under Varying Wind Load
(Turkish Chamber Civil Engineers, 2025) Ozalp, Abdulkadir; Gokdemir, Hande; Ciftci, Cihan
In this study, the performance of two different steel structure types (moment-resisting frame and braced frame) under wind loading was compared by addressing the fragility curves of these structure types. To perform this comparison, the dimensions of the members of these structural systems were first determined. Then, nonlinear static pushover analyses were conducted to assess the performance levels of each frame type. After applying these analyses, time-history analyses were performed with 100 different wind loads for each varying equivalent mean wind speed. Afterwards, the probability of exceeding the predetermined structural performance limits of the structure types was determined using Monte Carlo simulation method. Finally, the results of the simulation method were used to adapt the maximum likelihood estimation method to obtain the fragility curves of the structures. To conclude, it has been revealed that the material cost of the structure doubles when diagonal elements are used, but the wind speed required for a 100% collapse probability to occur in the braced frame is twice as high compared to the moment-resisting frame.
Dayım: Bir İnsanoğlunun Portresi
(TURKISH LIBRARIANS ASSOC, YENISEHIR, NECATIBEY CAD, ELGIN SOK, PO BOX 175, ANKARA, 06440, TURKEY, 2019) Donmez, Rasim Ozgur
This is a memoir written by his nephew about our colleague Ali Can, who passed away in last July.
Stratejik Yönelim ve İşletme Performansı: Bir Literatür Taraması
(2021) Kalkan, Pelin Karaca; Aladağ, Ömer Faruk
Stratejik yönelim, işletmelerin faaliyetlerini şekillendiren, etkileyen ve yaşamlarını sürdürmeleri ve performanslarını artırmalarına yönelik davranış geliştirmelerini sağlayan ilkeler olarak tanımlanmaktadır. Stratejik yönelim kavramı uluslararası yazında sıklıkla çalışılan bir konu olmasına rağmen Türkçe yazında yeterince ilgi görmemiştir. İşletmeler için kritik öneme sahip olan bu kavramın ve performansla ilişkisinin irdelenmesi önemli görülmektedir. Literatür taraması kapsamında stratejik yönelimlerden girişimcilik yönelimi, pazar yönelimi, öğrenme yönelimi ve teknolojik yönelim incelenmiştir. Bu araştırmada öncelikle stratejik yönelimlerin net bir şekilde tanımlanması ve işletme performansı ile ilişkilerinin irdelenmesi hedeflenmektedir. Bu doğrultuda stratejik yönelim- işletme performansı ilişkisi üzerine literatür incelenmiş, araştırma dahilindeki stratejik yönelimlerin kavramsal çerçeveleri sunulmuştur. Bununla birlikte, stratejik yönelimler arasındaki farklı ilişkiler ve bu ilişkilerin işletmelerin performans göstergeleri üzerindeki etkileri bütüncül bir şekilde irdelenmiştir. Ayrıca stratejik yönelim ile işletme performansı arasındaki ilişkide aracı mekanizmalar ve bu ilişkilerin hangi koşullar altında farklılaştığı aktarılmıştır. Son olarak, literatür taraması sonucunda geleceğe yönelik potansiyel araştırma konuları tanıtılarak yazına katkı sunulması amaçlanmıştır.
Estimating the Power Draw of Grizzly Feeders Used in Crushing-Screening Plants Through Soft Computing Algorithms
(Konya Teknik Univ, 2024) Koken, Ekin
In this study, the power draw (P) of several grizzly feeders used in the Turkish Mining Industry (TMI) is investigated by considering the classification and regression tree (CART), random forest (RF) and adaptive neuro-fuzzy inference system (ANFIS) algorithms. For this purpose, a comprehensive field survey is performed to collect quantitative data, including power draw (P) of some grizzly feeders and their working conditions such as feeder width (W), feeder length (L), feeder capacity (Q), and characteristic feed size (F80). 80 ). Before applying the soft computing methodologies, correlation analyses are performed between the input parameters and the output (P). According to these analyses, it is found that W and L are highly associated with P. On the other hand, Q is moderately correlated with P. Consequently, numerous soft computing models were run to estimate the P of the grizzly feeders. Soft computing analysis results demonstrate no superiority between the performances of RF and CART models. The RF analysis results indicate that the W is necessary for evaluating P for grizzly feeders. On the other hand, the ANFIS-based predictive model is found to be the best tool to estimate varying P values, and it satisfies promising results with a correlation of determination value (R2) of 0.97. It is believed that the findings obtained from the present study can guide relevant engineers in selecting the proper motors propelling grizzly feeders.

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