gazi university journal of science最新文献_第3页

ANN Identification technique and fuzzy PI Control of a Hybrid Indirect Matrix Converter with a Flying Capacitor three level Inverter in Power Active Filtering Application 混合间接矩阵变换器与飞电容三电平逆变器在电力有源滤波中的应用

gazi university journal of science Pub Date : 2023-09-01 DOI: 10.35378/gujs.1001559

Taki Eddine AMEUR, Aissa AMEUR, Benalia ATALLAH

引用次数: 0

Circular Supply Chain Network Design for E-Commerce 面向电子商务的循环供应链网络设计

gazi university journal of science Pub Date : 2023-09-01 DOI: 10.35378/gujs.1234548

Batuhan KOCAOĞLU, Meliha BULUT

引用次数: 0

An Empirical Evaluation of Feature Selection Stability and Classification Accuracy 特征选择稳定性和分类准确性的经验评估

IF 0.9

gazi university journal of science Pub Date : 2023-08-28 DOI: 10.35378/gujs.998964

Mustafa Büyükkeçeci̇, M. C. Okur

{"title":"An Empirical Evaluation of Feature Selection Stability and Classification Accuracy","authors":"Mustafa Büyükkeçeci̇, M. C. Okur","doi":"10.35378/gujs.998964","DOIUrl":"https://doi.org/10.35378/gujs.998964","url":null,"abstract":"The performance of inductive learners can be negatively affected by high-dimensional datasets. To address this issue, feature selection methods are used. Selecting relevant features and reducing data dimensions is essential for having accurate machine learning models. Stability is an important criterion in feature selection. Stable feature selection algorithms maintain their feature preferences even when small variations exist in the training set. Studies have emphasized the importance of stable feature selection, particularly in cases where the number of samples is small and the dimensionality is high. In this study, we evaluated the relationship between stability measures, as well as, feature selection stability and classification accuracy, using the Pearson Product-Moment Correlation Coefficient. We conducted an extensive series of experiments using five filter and two wrapper feature selection methods, three classifiers for subset and classification performance evaluation, and eight real-world datasets taken from two different data repositories. We measured the stability of feature selection methods using a total of twelve stability metrics. Based on the results of correlation analyses, we have found that there is a lack of substantial evidence supporting a linear relationship between feature selection stability and classification accuracy. However, a strong positive correlation has been observed among several stability metrics.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139348703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of Sub-acute Administration of Onion Waste Quercetin on the Hippocampus of Mice: A Histological Approach 亚急性给药洋葱废槲皮素对小鼠海马的组织学影响

gazi university journal of science Pub Date : 2023-08-26 DOI: 10.35378/gujs.1272285

Nathan DİBAL, Musa SAMAİLA CHİROMA, Martha ATTAH, Sunday MANYE

{"title":"Effects of Sub-acute Administration of Onion Waste Quercetin on the Hippocampus of Mice: A Histological Approach","authors":"Nathan DİBAL, Musa SAMAİLA CHİROMA, Martha ATTAH, Sunday MANYE","doi":"10.35378/gujs.1272285","DOIUrl":"https://doi.org/10.35378/gujs.1272285","url":null,"abstract":"Quercetin is a flavonoid with a great capability of crossing the blood-brain barrier. It is reported to exert numerous beneficial effects on both animal and human health. The study evaluates the effects of onion waste quercetin (OWQ) on the histology of the hippocampus and dentate gyrus of mice. Twenty mice were assigned into four groups (n=5). The groups were given distilled water, and OWQ at 95mg/kg, 190mg/kg, and 380mg/kg respectively for 28 days. The brain of each mouse was harvested afterward, weighed, and processed for light microscopy. The normal and degenerating cells in the dentate gyrus and hippocampus Cornu Ammonis (CA1 & CA3) were counted. The micrographs of the dentate gyrus showed normal molecular, granular, and polymorphic layers in the control mice, as well as the mice, treated with OWQ with few degenerating cells in the granular layer of OWQ-treated (190mg/kg) mice. The CA3 area of the hippocampus showed normal molecular and polymorphic layers in OWQ-treated mice. However, the granular layer of the mice that received OWQ at 190mg/kg showed numerous degenerating cells. OWQ especially at 95mg/kg was found to significantly increase the number of normal cells in the dentate gyrus and hippocampus (CA1 & CA3) of the brain compared to the control at P< .05. It also significantly decreased degenerating cells compared to the control (P< .05). In conclusion, onion waste quercetin, especially at 95mg/kg was found to maintain the pool of normal cells within the dentate gyrus and hippocampus of mice brain.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135236328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integration of Daylight Use and Analysis in Double Skin Facades: A Literature Review 双层幕墙的日光利用与分析一体化：文献综述

IF 0.9

gazi university journal of science Pub Date : 2023-08-04 DOI: 10.35378/gujs.1243933

Mustafa Serhan Ünlütürk, Tuğçe Kazanasmaz

{"title":"Integration of Daylight Use and Analysis in Double Skin Facades: A Literature Review","authors":"Mustafa Serhan Ünlütürk, Tuğçe Kazanasmaz","doi":"10.35378/gujs.1243933","DOIUrl":"https://doi.org/10.35378/gujs.1243933","url":null,"abstract":"Double skin facades (DSF) aim to save energy reducing the heat losses in buildings. They are visually appeal while allowing to use daylight efficiently. Such facade systems can reduce glare and distribute daylight evenly in the interior when compared to conventional facade systems. That is a result of cavities between two glass facades and locating sunshading elements in them, although this system provides a high level of transparency. As their primary purpose of application is to ensure thermal performance and ventilation, most studies in literature have focused on these. However, to construct and maintain a holistic point of view in building performance, researchers and professionals need to take into account the integration of daylight use and analysis in such facades. This study aims to analyse daylight performance implemented studies in relation to these systems and presents a comprehensive and recent review on integration of daylight use and analysis. Recent studies are shown in tabulated form and interpreted in detail with graphics. considering their methodologies, daylight parameters and findings. Results show that the daylight parameter is one of the most important issues that architects or designers should consider from the moment they start the design, and they should make their designs based on the optimum penetration of daylight into the building. This review can contribute to literature in calling attention to daylight studies in DSF. It provides feedback information on how recent researches and technological developments in DSF can let them benefit from daylight more efficiently. That makes more and further improvements in such facade system design. Thus, DSF helps to build an integrated building performance approach in achieving sustainability.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139351768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Head-to-Tail Cyclization of α-Conotoxin TxID Leads to Enhanced Stability in Serum α- concontoxin TxID的首尾环化导致血清稳定性增强

IF 0.9

gazi university journal of science Pub Date : 2023-07-25 DOI: 10.35378/gujs.1263833

Nurcan BİÇEN KARAKOÇ, Muharrem Akcan

引用次数: 0

A Low-Profile High Isolation Wideband Dual-Polarized Antenna for Sub-1 GHz Base Stations 用于 1 千兆赫以下基站的低矮型高隔离度宽带双极化天线

IF 0.9

gazi university journal of science Pub Date : 2023-07-24 DOI: 10.35378/gujs.1279556

E. A. Miran, M. Çiydem

引用次数: 0

Classical and Bayesian Inference for the Length Biased Weighted Lomax Distribution under Progressive Censoring Scheme 渐进式删减方案下长度偏差加权洛马克斯分布的经典推论和贝叶斯推论

IF 0.9

gazi university journal of science Pub Date : 2023-07-23 DOI: 10.35378/gujs.1249968

Amal S. HASSAN, Samah A. ATİA, Hiba Z. MUHAMMED

{"title":"Classical and Bayesian Inference for the Length Biased Weighted Lomax Distribution under Progressive Censoring Scheme","authors":"Amal S. HASSAN, Samah A. ATİA, Hiba Z. MUHAMMED","doi":"10.35378/gujs.1249968","DOIUrl":"https://doi.org/10.35378/gujs.1249968","url":null,"abstract":"In this study, the distribution’s reliability and hazard functions, as well as the population parameters, are estimated for the length biased weighted Lomax (LBWLo) based on progressively Type II censored samples. The maximum likelihood and Bayesian methods are implanted to get the proposed estimators. Gamma and Jeffery's priors serve as informative and non-informative priors, respectively, from which the posterior distribution of the LBWLo distribution is constructed. To obtain the Bayesian estimates, the Metropolis-Hasting (MH) algorithm is also used. We obtain asymptotic confidence intervals based on the Fisher information matrix. Using the sample produced by the MH method, we construct the intervals with the highest posterior densities. A numerical simulation research is done to evaluate the effectiveness of the approaches. Through Monte Carlo simulation, we compare the proposed estimators in terms of mean squared error. It is possible to get coverage probability and average interval lengths of 95% .The study's findings supported the idea that, in the majority of cases, Bayes estimates with an informative prior are more appropriate than other estimates.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139356327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimal Equipment Capacity Planning in the Neonatal Intensive Care Unit with Simulation-Optimization Approach 利用仿真优化方法优化新生儿重症监护室的设备容量规划

IF 0.9

gazi university journal of science Pub Date : 2023-07-17 DOI: 10.35378/gujs.1247829

Mufide Narli, Yusuf Kuvvetli̇, Ali Kokangül

{"title":"Optimal Equipment Capacity Planning in the Neonatal Intensive Care Unit with Simulation-Optimization Approach","authors":"Mufide Narli, Yusuf Kuvvetli̇, Ali Kokangül","doi":"10.35378/gujs.1247829","DOIUrl":"https://doi.org/10.35378/gujs.1247829","url":null,"abstract":"Capacity planning should be performed to balance investment costs and benefits of investing to meet the current and future demand in intensive care units. Having a high capacity to increase patient admission will lead to unutilized capacity in some periods, thereby increasing costs. On the other hand, patient admission requests from inborn and transported patients might be rejected due to lack of equipment. It should be considered in terms of cost-effectiveness and patient health; therefore, optimal equipment capacity must be determined. In this study, the optimal capacity planning problem has been considered for the neonatal intensive care unit of a hospital adopting the simulation-optimization approach. A discrete event simulation model is proposed for a neonatal intensive care unit in Adana, Turkey. Then, the optimization model identified the optimal numbers of incubators, ventilators, and nitric oxide devices to maximize equipment efficiency and minimize total inborn patient rejection and transport ratios. Three different resource allocations are presented, and the best is obtained from these three objectives as 72 incubators, 35 ventilators, and three nitric oxide devices. The application results obtained have revealed that the rejection and transport rate, which is found to be 1.12% in the current situation, can be reduced to 0.2% with different numbers of equipment and that equipment efficiency can be achieved with optimal numbers of equipment. The results of the study can help the decision-makers when minimum transport and rejection ratios are critical which almost intensive care units are required. Furthermore, the proposed simulation-optimization model can be adapted to different neonatal intensive care units having the same characteristics.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139358669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

OBSERVING CONDUCTANCE QUANTIZATION by a NOVEL MAGNETIC CONTROL SYSTEM 用一种新型磁控制系统观察电导量子化

IF 0.9

gazi university journal of science Pub Date : 2023-07-10 DOI: 10.35378/gujs.1222023

Dila Çi̇ğdem, Bilge Toprak Karakaya, Duru Deği̇mli̇, Meltem GÖNÜLOL ÇELİKOĞLU, Yavuz Öztürk

引用次数: 0