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FUZZY HOMOMORPHISM THEOREMS ON GROUPS
Addis, Gezahagne Mulat The Kangwon-Kyungki Mathematical Society 2018 한국수학논문집 Vol.26 No.3
In this paper we introduce the notion of a fuzzy kernel of a fuzzy homomorphism on groups and we show that it is a fuzzy normal subgroup of the domain group. Conversely, we also prove that any fuzzy normal subgroup is a fuzzy kernel of some fuzzy epimorphism, namely the canonical fuzzy epimorphism. Finally, we formulate and prove the fuzzy version of the fundamental theorem of homomorphism and those isomorphism theorems.
Addis Lulu(아디스),Myeongnam Park(박명남),Hyunseung Kim(김현승),Dongil Shin(신동일) 한국가스학회 2017 한국가스학회지 Vol.21 No.2
SIS는 공정안전시스템 분야에서 폭넓게 활용될 수 있는 계장안전시스템이다. SIS는 유해화학물질 누출 사고로부터 인간, 물질적 자산 그리고 환경에 미치는 피해를 줄이기 위해 필수적이다. 현재 전기, 전자 그리고 프로그래밍 가능한 전자 (E / E/ PE) 장치가 기계, 공압 및 유압 시스템과 상호 작용하는 통합 안전 시스템은 IEC 61508과 같은 국제 안전 표준을 따르도록 되어있다. IEC 61508은 안전 수명주기의 모든 사항을 규정한다. SIS 지원 도구 없이 안전 수명주기에 따라 IEC 61508의 요구 사항을 충족시키는 것은 복잡한 일이다. 본 연구에서는, 사용자가 보다 쉽게 안전 수명주기의 설계 단계를 구현할 수 있도록 도움을 줄 수 있는 On-Line SIS 지원 도구를 제시하였다. On-Line SIS 지원 도구는 데이터 읽기 및 수정 시스템과 통합될 수 있는 안드로이드 응용 프로그램의 형태로 되어있다. 이 도구는 안전 수명주기의 설계 단계에서 소요되는 계산 시간을 줄이고 계산 과정에서 발생할 수 있는 오류를 줄인다. 또한 On-Line SIS 지원 도구는 비용 요소에 근거한 최적화 접근법을 제시할 수 있으며, multi-objective GA를 사용하여 최적의 솔루션 조합을 찾을 수 있도록 하였다. Safety Instrumented Systems (SIS) have wide application area. They are of vital importance at process plants to detect the onset of hazardous events, for instance, a release of some hazardous material, and for mitigating their consequences to humans, material assets, and the environment. The integrated safety systems, where electrical, electronic, and/or programmable electronic (E/E/PE) devices interact with mechanical, pneumatic, and hydraulic systems are governed by international safety standards like IEC 61508. IEC 61508 organises its requirements according to a Safety Life Cycle (SLC). Fulfilling these requirements following the SLC can be complex without the aid of SIS supporting tools. This paper presents simple SIS support tool which can greatly help the user to implement the design phase of the safety lifecycle. This tool is modelled in the form of Android application which can be integrated with a Web-based data reading and modifying system. This tool can reduce the computation time spent on the design phase of the SLC and reduce the possible errors which can arise in the process. In addition, this paper presents an optimization approach to SISs based on cost measures. The multi-objective genetic algorithm has been used for the optimization to search for the best combinations of solutions without enumeration of all the solution space.
( Addis Tsehaye ),( A. H. Buchanan ),( Jae-kyung Cha ) 한국목재공학회 1998 목재공학 Vol.26 No.2
This paper examines the effects of specimen length and grade on the strength and stiffness properties of structural timber of radiata pine. The tensile strength and modulus of elasticity of 1,902 machine-graded boards with 3.15- and 1.62-m clear span lengths, were determined using a horizontal tension test machine. The mean failure and characteristic stress values for tensile strength show an extremely high dependency on test specimen length. The mean and characteristic values of both modulus of elasticity and tensile strength show significant dependency on machine stress grades.
Fuzzy prime spectrum of ∁-algebras
Gezahagne Mulat Addis 강원경기수학회 2020 한국수학논문집 Vol.28 No.1
In this paper, we define fuzzy prime ideals of $ C- $algebras and investigate some of their properties. Furthermore, we study the topological properties of the space of fuzzy prime ideals of $ C- $algebra equipped with the hull-kernel topology.
Random forest classifier for real-time chemical leak source tracking using fence-monitoring sensors
김현승,Addis Lulu Gebreselassie,단승규,신동일 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.6
Fast and reliable diagnosis of chemical leak and leak location(s) can save lives and reduce the damage from chemical accidents by enabling quick response. This paper presents a method that uses random forest (RF) classifier to track the location of chemical leak in real-time. A set of big data of leak accidents, which is needed to learn the RF classifier, is extracted by performing massive CFD simulations on a real chemical plant. The RF model is designed with optimal parameters and descriptors through parameter effect experiment. Feature ranking is also implemented to eliminate unnecessary attributes from the dataset. Using the pre-processed data, the optimal RF model achieved a test accuracy of 86.9% for the classification problem of predicting the leak location among 40-potential leak sources in the plant. Furthermore, when analyzing prediction errors by visualizing the classification boundary of RF model, most of the prediction errors are confirmed to be misclassification of adjacent leak locations. Considering the high prediction accuracy of the RF model, the RF-based leak source tracking model is expected to be effectively applied to industrial leak accidents.
Visceral leishmaniasis treatment outcome and its determinants in northwest Ethiopia
Getachew Mebrahtu Welay,Kefyalew Addis Alene,Berihun Assefa Dachew 한국역학회 2017 Epidemiology and Health Vol.39 No.-
OBJECTIVES: Poor treatment outcomes of visceral leishmaniasis (VL) are responsible for the high mortality rate of this condition in resource-limited settings such as Ethiopia. This study aimed to identify the proportion of poor VL treatment outcomes in northwest Ethiopia and to evaluate the determinants associated with poor outcomes. METHODS: A hospital-based retrospective study was conducted among 595 VL patients who were admitted to Kahsay Abera Hospital in northwest Ethiopia from October 2010 to April 2013. Data were entered into Epi Info version 7.0 and exported to SPSS version 20 for analysis. Bivariate and multivariate logistic regression models were fitted to identify the determinants of VL treatment outcomes. Adjusted odds ratio (aORs) with 95% confidence intervals (CIs) were used, and p-values <0.05 were considered to indicate statistical significance. RESULTS: The proportion of poor treatment outcomes was 23.7%. Late diagnosis (≥29 days) (aOR, 4.34; 95% CI, 2.22 to 8.46), severe illness at admission (inability to walk) (aOR, 1.63; 95% CI, 1.06 to 2.40) and coinfection with VL and human im munodeficiency virus (HIV) (aOR, 2.72; 95% CI, 1.40 to 5.20) were found to be determinants of poor VL treatment outcomes. CONCLUSIONS: Poor treatment outcomes, such as death, treatment failure, and non-adherence, were found to be common. Special attention must be paid to severely ill and VL/HIV-coinfected patients. To improve VL treatment outcomes, the early diagnosis and treatment of VL patients is recommended.
L-FUZZY SEMI-PRIME IDEALS IN UNIVERSAL ALGEBRAS
Alaba, Berhanu Assaye,Addis, Gezahagne Mulat The Kangwon-Kyungki Mathematical Society 2019 한국수학논문집 Vol.27 No.2
In this paper, we introduce the notion of L-fuzzy semi-prime ideals and the radical of L-fuzzy ideals in universal algebras and make a theoretical study on their basic properties.