European Journal of Engineering and Formal Sciences最新文献_第2页

Virtual Learning Environments Practices, in the students of System Engineering of the Tecnologico Nacional de Mexico, Campus Mexicali 虚拟学习环境实践，墨西哥国立理工大学系统工程专业学生，墨西卡利校区

European Journal of Engineering and Formal Sciences Pub Date : 2018-12-29 DOI: 10.26417/ejef.v2i3.p63-65

Jesús Francisco Gutiérrez Ocampo, Corina Araceli Ortiz Perez, M. Camaño

引用次数: 0

Analysis of Dimensional Variations of Precision Gear Forging Die Geometry Due to Shrink Fit 精密齿轮锻模收缩配合尺寸变化分析

European Journal of Engineering and Formal Sciences Pub Date : 2018-12-29 DOI: 10.26417/ejef.v2i3.p87-95

O. Eyercioglu

{"title":"Analysis of Dimensional Variations of Precision Gear Forging Die Geometry Due to Shrink Fit","authors":"O. Eyercioglu","doi":"10.26417/ejef.v2i3.p87-95","DOIUrl":"https://doi.org/10.26417/ejef.v2i3.p87-95","url":null,"abstract":"The usual way to shrink fit design for precision forging dies are made by thick wall cylinder approach; i.e., taking the pitch diameter of the gear as bore diameter of the die insert without considering gear tooth shape. However, the compressive pre-stress due to the shrink fitting causes dimensional variations on the gear profile of the die insert. The dimensional accuracy of the final product is dependent on the accuracy of the gear die. Therefore, the dimensional variations due to shrink fit must be pre-determined and the gear tooth profile on the die insert modified accordingly. In this study, the dimensional variations of the precision spur gear forging die because of shrink fitting are analyzed by finite element method and the results are compared with the experimental ones. The results show that the FE model is successful to simulate the cylindrical die and agree well with thick wall cylinder approach and the experimental measurements. However, both the experimental measurements and the finite element results of gear die predict much higher radial displacements than the results of cylindrical die. Therefore, the determination of shape change of the gear die profile is beyond the capability of the thick wall cylindrical approach.","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"2000 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121075714","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: 2

Study on Urban Sustainable Restructuring of Leinefelde, Germany and Revealing the Important Strategies for Environmental Well-Being for Shrinking Cities 德国Leinefelde城市可持续结构调整及其对萎缩城市环境福祉的启示

European Journal of Engineering and Formal Sciences Pub Date : 2018-12-29 DOI: 10.26417/ejef.v2i3.p76-85

Sri Charan

引用次数: 1

Anomaly-Based Intrusion Detection: Feature Selection and Normalization Influence to the Machine Learning Models Accuracy 基于异常的入侵检测:特征选择和归一化对机器学习模型精度的影响

European Journal of Engineering and Formal Sciences Pub Date : 2018-12-29 DOI: 10.26417/ejef.v2i3.p101-106

D. Protić, M. Stankovic

{"title":"Anomaly-Based Intrusion Detection: Feature Selection and Normalization Influence to the Machine Learning Models Accuracy","authors":"D. Protić, M. Stankovic","doi":"10.26417/ejef.v2i3.p101-106","DOIUrl":"https://doi.org/10.26417/ejef.v2i3.p101-106","url":null,"abstract":"Anomaly-based intrusion detection system detects intrusion to the computer network based on a reference model that has to be able to identify its normal behavior and flag what is not normal. In this process network traffic is classified into two groups by adding different labels to normal and malicious behavior. Main disadvantage of anomaly-based intrusion detection system is necessity to learn the difference between normal and not normal. Another disadvantage is the complexity of datasets which simulate realistic network traffic. Feature selection and normalization can be used to reduce data complexity and decrease processing runtime by selecting a better feature space This paper presents the results of testing the influence of feature selection and instances normalization to the classification performances of k-nearest neighbor, weighted k-nearest neighbor, support vector machines and decision tree models on 10 days records of the Kyoto 2006+ dataset. The data was pre-processed to remove all categorical features from the dataset. The resulting subset contained 17 features. Features containing instances which could not be normalized into the range [-1, 1] have also been removed. The resulting subset consisted of nine features. The feature ‘Label’ categorized network traffic to two classes: normal (1) and malicious (0). The performance metric to evaluate models was accuracy. Proposed method resulted in very high accuracy values with Decision Tree giving highest values for not-normalized and with k-nearest neighbor giving highest values for normalized data.Keywords: feature selection, normalization, k-NN, weighted k-NN, SVM, decision tree, Kyoto 2006+","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115617523","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: 9

Performance Analysis of Coded Frequency Division Multiplexing 编码频分复用的性能分析

European Journal of Engineering and Formal Sciences Pub Date : 2018-12-01 DOI: 10.2478/ejef-2018-0017

M. Farhan

引用次数: 0

DLC Coatings on Spherical Elements of HIP Endoprostheses 髋关节内假体球形元件的DLC涂层

European Journal of Engineering and Formal Sciences Pub Date : 2018-12-01 DOI: 10.2478/ejef-2018-0015

V. V. Vasylyev, V. Strel’nitskij, V. Makarov, M. Skoryk, G. Lazarenko

{"title":"DLC Coatings on Spherical Elements of HIP Endoprostheses","authors":"V. V. Vasylyev, V. Strel’nitskij, V. Makarov, M. Skoryk, G. Lazarenko","doi":"10.2478/ejef-2018-0015","DOIUrl":"https://doi.org/10.2478/ejef-2018-0015","url":null,"abstract":"Abstract Hard coatings are increasingly being used in medicine to protect metal endoprostheses The experimental process for the high-productive synthesis of high-quality diamond-like carbon (DLC) coatings with high hardness and a sufficiently high level of adhesion to the spherical shaped parts of the hip joint made from the stainless steel or cobalt-chrome alloy have been developed. DLC coating deposition was performed by vacuum-arc method from a high-productive source of the filtered vacuum-arc carbon plasma of rectilinear type with a \"magnetic island\". The high degree of thickness uniformity in the coating on the head of the hip joint with a high adhesion to the metal joint base was developed. Modernization of the vacuum arc plasma source allowed to accelerate the cathode spot motion, exclude substrate overheating and increase the diamond-like carbon hardness up to 30-40 GPa. The high adhesion level was achieved as a result of the high voltage pulsed of substrate bias potential use and multilayer architecture of DLC coating. The DLC coating on the heads of hip endoprosthesis did not peel off when boiling endoprosthesis or when immersing it into the liquid nitrogen.","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134386822","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

Attaining a Beam-Like Behavior with FRP Strips and CAM Ribbons 用玻璃钢带和凸轮带获得类似梁的性能

European Journal of Engineering and Formal Sciences Pub Date : 2018-12-01 DOI: 10.2478/ejef-2018-0012

E. Ferretti

{"title":"Attaining a Beam-Like Behavior with FRP Strips and CAM Ribbons","authors":"E. Ferretti","doi":"10.2478/ejef-2018-0012","DOIUrl":"https://doi.org/10.2478/ejef-2018-0012","url":null,"abstract":"Abstract One of the major concerns in the seismic retrofitting of masonry walls is that of increasing the ultimate load for out-of-plane forces. In multi-story buildings, these forces may originate from the hammering actions of floors, when the earthquake direction is orthogonal to the wall. A possibility for counteracting the out-of-plane displacements is retaining the wall by building some buttresses, that is, some beams lean against the wall and disposed vertically. Another possibility is to make the buttress in the thickness of the wall. In this second case, we must cut the wall for its entire height, realize the buttress, and restore the masonry wall around it. In both cases, the interventions are highly invasive. The first intervention also leads to increments of mass that enhance the attraction of seismic forces. The aim of this paper is to find a less invasive and lighter alternative for realizing buttresses. We proposed to use FRP strips and steel ribbons in a combined fashion, so as to realize an ideal vertical I-beam embedded into the wall, without requiring to cut the masonry. We also provided some experimental results for verifying the effectiveness of the model.","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130786105","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: 6

Effectiveness of Active Confinement Techniques with Steel Ribbons: Masonry Buildings 钢带主动约束技术的有效性:砖石建筑

European Journal of Engineering and Formal Sciences Pub Date : 2018-12-01 DOI: 10.2478/ejef-2018-0013

E. Ferretti

引用次数: 5

Public Expenditures Through Public Procurement 通过公共采购实现公共支出

European Journal of Engineering and Formal Sciences Pub Date : 2018-04-12 DOI: 10.2478/ejef-2018-0010

Azem Duraku

{"title":"Public Expenditures Through Public Procurement","authors":"Azem Duraku","doi":"10.2478/ejef-2018-0010","DOIUrl":"https://doi.org/10.2478/ejef-2018-0010","url":null,"abstract":"Abstract Treaty of Rome of 1957 and following treaties on amending the Treaty of Rome contain a number of basic principles on which the EU is founded. Among these principles, the most important ones related to the public procurement are: prevention of discrimination based on nationality, free movement of goods; right and freedom of establishment of a business; the right to provide services. Spending of public money in Kosovo pursuant to the Law on Procurement is found on the following principles: economization and efficiency; equal treatment and non-discrimination; transparency; value for money. The average of open procedure application in EU countries is 73% based on notices, whereas in Kosovo is 82.80% based on notices. In the end of 2014, Kosovo commenced the development of electronic procurement platform. This project takes place within the Public Sector Modernization Project. The importance of the electronic procurement is stated in the statement of European Commission: “Modernization and opening of procurement markets across borders - including through the electronic procurement expansion - are crucial for the competition in Europe and creating new opportunities for businesses in EU”. A good procurement system in Kosovo will have an impact on elimination of negative phenomena (corruption and bad management) in the management of public expenditures from spending agencies, as well as an impact on increase of budget saving.","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128949171","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: 4

An Analysis of Occupational Incidents, Prioritization of Factors Causing These by Using Multi Criteria Decision Making Methods and Identification of Ways for Reducing These: Case Study in Oil and Gas Fields 基于多准则决策方法的职业事故分析、导致事故因素的优先排序及减少事故的途径:以油气田为例

European Journal of Engineering and Formal Sciences Pub Date : 2018-04-12 DOI: 10.2478/ejef-2018-0008

E.S. Gokpinar, Can Elmar Balas

{"title":"An Analysis of Occupational Incidents, Prioritization of Factors Causing These by Using Multi Criteria Decision Making Methods and Identification of Ways for Reducing These: Case Study in Oil and Gas Fields","authors":"E.S. Gokpinar, Can Elmar Balas","doi":"10.2478/ejef-2018-0008","DOIUrl":"https://doi.org/10.2478/ejef-2018-0008","url":null,"abstract":"Abstract The aim of the Occupational Health and Safety studies conducted in the oil and gas sector is; to protect workers and to ensure occupational safety in works performed on drilling fields. The aforementioned studies of the companies operating in this field in Turkey are inadequate and are not given due importance to. In such companies, occupational incidents become inevitable for that reason. A vast number of studies have been conducted in many other countries around the world to reduce the number of occupational incidents, and those have led to a substantial reduction in those incidents. In Turkey, it is necessary to take measures to reduce the number of occupational incidents in the oil and gas sector. In this study, occupational incidents occurred in the company investigated as a case study and the other occupational incidents occurred in similar companies and the measures taken to reduce them have been discussed in detail. This study aims to explain what occupational incidents occur in the sector, what the root causes of them are and how to reduce the occupational incidents by taking measures.","PeriodicalId":143703,"journal":{"name":"European Journal of Engineering and Formal Sciences","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128821697","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