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Tiruneh, Sintayehu Nibret,Kang, Bong Kyun,Kwag, Sung Hoon,Humayoun, Usama Bin,Yoon, Dae Ho ELSEVIER 2018 CURRENT APPLIED PHYSICS Vol.18 No.supp
<P>Energy storage is becoming highly important as renewable generation sources are added to the mix in electrical power generation and distribution systems. Supercapacitors and batteries could allow renewables to overcome intermittency difficulties by regulating the voltage, frequency, and phase angle of the power. Transition-metal oxide, hydroxide, and sulfide forms, carbonaceous materials, and conducting polymers can be used as electrodes for supercapacitors. Graphene is considered to be a promising material for supercapacitors because of its high surface area and theoretical gravimetric capacitance. However, aggregation of graphene sheets severely decreases the accessible surface area and theoretical gravimetric capacitance. Here we report a unique synthesis route of a hybrid nickel cobalt sulfide anchored in a crumpled and porous graphene framework to address the aforementioned problem. The hybrid sample, a nickel cobalt sulfide/crumpled-porous graphene framework, delivered higher specific capacitance and better electronic conductivity than the porous graphene framework when used as a supercapacitor electrode. (C) 2017 Elsevier B.V. All rights reserved.</P>
Getachew Ferede,Moges Tiruneh,Ebba Abate,Wondmeneh Jemberie Kassa,Yitayih Wondimeneh,Demekech Damtie,Belay Tessema 한국역학회 2018 Epidemiology and Health Vol.40 No.-
OBJECTIVES: The Aedes mosquito is a vector for transmitting many arboviruses. Knowledge of the breeding habitat of this vector is vital for implementing appropriate interventions. Thus, this study was conducted to determine the breeding habitats and presence of Aedes mosquito species in the study areas. METHODS: A house-to-house cross-sectional survey of Aedes mosquito breeding habitats was carried out in Metema and Humera, Ethiopia, in August 2017. All available water-holding containers present in and around houses were inspected for the presence of immature stages of Aedes mosquitoes, and they were collected and reared to the adult stage for species identification. In the larval survey, the house index, container index, and Breteau index were computed as risk indices. RESULTS: Of the 384 houses surveyed for the presence of Aedes mosquito larval breeding, 98 were found to be positive for larvae. During the survey, a total of 566 containers were inspected, of which 186 were found to be infested with Aedes mosquito larvae, with a container index of 32.9, a house index of 25.5, and a Breteau index of 48.4. The most common Aedes mosquito breeding habitats were discarded tires (57.5%), followed by mud pots (30.0%). Of the 1,077 larvae and pupae collected and reared, Aedes aegypti (49.3%), Ae. vittatus (6.5%), and Culex species (44.2%) were identified. CONCLUSIONS: Discarded tires were the most preferred breeding habitats for Aedes mosquitoes. Moreover, Ae. aegypti, the main vector of dengue and other arboviruses, was identified for the first time in this region, suggesting a high potential for arbovirus transmission in the study areas.
MELESSE, WONDWOSEN GEBEYAW,TIRUNEH, AWOKE ANDARGIE,DERESE, GETACHEW ADAMU The Korean Society for Computational and Applied M 2020 Journal of applied mathematics & informatics Vol.38 No.1
In this paper, a class of linear second order singularly perturbed delay differential turning point problems containing a small delay (or negative shift) on the reaction term and when the solution of the problem exhibits twin boundary layers are examined. A hybrid finite difference scheme on an appropriate piecewise-uniform Shishkin mesh is constructed to discretize the problem. We proved that the method is almost second order ε-uniformly convergent in the maximum norm. Numerical experiments are considered to illustrate the theoretical results.
Humayoun, Usama Bin,Tiruneh, Sintayehu Nibret,Yoon, Dae-Ho Applied Science Publishers 2018 Dyes and pigments Vol.152 No.-
<P><B>Abstract</B></P> <P>A novel Mn<SUP>4+</SUP> activated SrLaScO<SUB>4</SUB> was synthesized and investigated for its crystal structure and optical characteristics. SrLaScO<SUB>4</SUB> exhibits a well-known K<SUB>2</SUB>NiF<SUB>4</SUB> structure, it crystalizes in Abma space group and provides an octahedral site of ScO<SUB>6</SUB> which was exploited for Mn<SUP>4+</SUP> incorporation. The synthesized phosphor showed broad excitation bands and an uncommon narrow emission band centered at 690 nm with an full width at half maximum (FWHM) of ∼35 nm. The optimal activator ion concentration for SrLaScO<SUB>4</SUB>:Mn<SUP>4+</SUP> was found to be ∼0.8 mol%. The photoluminescence and photoluminescence excitation characteristics indicate that it can be opted as red emitting material for the white LEDs for indoor agriculture where the deep red emissions are favored. However the tendency of luminescence quenching in the phosphor is very high and ∼85% of original intensity is damped with a temperature rise of 150°C.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel SrLaScO<SUB>4</SUB>:Mn<SUP>4+</SUP> was synthesized through cellulose assisted liquid phase precursor process. </LI> <LI> Rietveld refinements were performed to investigate crystal structure in detail. </LI> <LI> SrLaScO<SUB>4</SUB> has orthorhombic structure in Abma space group with [ScO<SUB>6</SUB>] octahedral sites. </LI> <LI> Deep-red (690 nm) narrow band (∼35 nm) emission was observed from SrLaScO4:Mn<SUP>4+</SUP>. </LI> </UL> </P>
Wondwosen Gebeyaw Melesse,Awoke Andargie Tiruneh,Getachew Adamu Derese 한국전산응용수학회 2020 Journal of applied mathematics & informatics Vol.38 No.1
In this paper, a class of linear second order singularly perturbed delay differential turning point problems containing a small delay (or negative shift) on the reaction term and when the solution of the problem exhibits twin boundary layers are examined. A hybrid finite difference scheme on an appropriate piecewise-uniform Shishkin mesh is constructed to discretize the problem. We proved that the method is almost second order ε-uniformly convergent in the maximum norm. Numerical experiments are considered to illustrate the theoretical results.
Peter Austin Morton Ntenda,Walaa Mamdouh Reyad El-Meidany,Fentanesh Nibret Tiruneh,Mfundi President Sebenele Motsa,Joyce Nyirongo,Gowokani Chijere Chirwa,Arnold Kapachika,Owen Nkoka 대한고혈압학회 2022 Clinical Hypertension Vol.28 No.-
Hypertension (HTN), characterized by an elevation of blood pressure, is a serious public health chronic condition that significantly raises the risks of heart, brain, kidney, and other diseases. In South Africa, the prevalence of HTN (measured objectively) was reported at 46.0% in females, nonetheless little is known regarding the prevalence and risks factors of self-reported HTN among the same population. Therefore, the aim of this study was to examine determinants of self-reported HTN among women in South Africa.The study used data obtained from the 2016 South African Demographic and Health Survey. In total, 6,027 women aged ≥ 20 years were analyzed in this study. Self-reported HTN was defined as a case in which an individual has not been clinically diagnosed with this chronic condition by a medical doctor, nurse, or health worker. Multiple logistic regression models were employed to examine the independent factors of self-reported HTN while considering the complex survey design.Overall, self-reported HTN was reported in 23.6% (95% confidence interval [CI], 23.1–24.1) of South African women. Being younger (adjusted odds ratio [aOR], 0.04; 95% CI, 0.03–0.06), never married (aOR, 0.69; 95% CI, 0.56–0.85), and not covered by health insurance (aOR, 0.74; 95% CI, 0.58–0.95) reduced the odds of self-reported HTN. On the other hand, being black/African (aOR, 1.73; 95% CI, 1.17–2.54), perception of being overweight (aOR, 1.72; 95% CI, 1.40–2.11), and perception of having poor health status (aOR, 3.53; 95% CI, 2.53–5.21) and the presence of other comorbidities (aOR, 7.92; 95% CI, 3.63–17.29) increased the odds of self-reported HTN.Self-reported HTN was largely associated with multiple sociodemographic, health, and lifestyle factors and the presence of other chronic conditions. Health promotion and services aiming at reducing the burden of HTN in South Africa should consider the associated factors reported in this study to ensure healthy aging and quality of life among women.
향상된 에너지 저장 능력을 가진 이중 전이금속 황화물 계층적 중공 구조의 나노구
이영훈,최형욱,김민섭,정동인,강봉균,윤대호,Lee, Young Hun,Choi, Hyung Wook,Kim, Min Seob,Jeong, Dong In,Tiruneh, Sintayehu Nibret,Kang, Bong Kyun,Yoon, Dae Ho 한국결정성장학회 2018 韓國結晶成長學會誌 Vol.28 No.3
금속 알콕사이드인 CuCo-glycerate 나노구의 용매열합성 과정을 통해 단분산된 Cu-Co 이중 금속 황화물 계층적 중공 구조의 나노구($CuCo_2S_4$ HMHNSs)를 합성하는데 성공하였다. 이 반응 메커니즘에서 용매열합성 온도와 보조 계면활성제인 glycerol의 양은 CuCo-glycerate 나노구의 형태를 최적화하는데 중요한 역할을 한다. 또한 $CuCo_2S_4$ HMHNSs는 glycerate와 황 이온 간의 음이온 교환 반응을 통해 10시간의 최적화된 황화 반응 조건하에서 성공적으로 합성되었다. 최종적으로 합성된 물질의 구조적, 화학적 특성은 SEM, TEM, XRD와 전기화학적 특성 평가에 의해 확인되었다. The metal alkoxide, CuCo-glycerate nanospheres (NSs), were successfully synthesized as Cu-Co bimetallic sulfides hierarchical multi-shelled hollow nanospheres ($CuCo_2S_4$ HMHNSs) through solvothermal synthesis. In this reaction mechanism, the solvothermal temperature and the amount of glycerol as a cosurfactant play significant role to optimize the morphology of CuCo-glycerate NSs. Furthermore, $CuCo_2S_4$ HMHNSs were obtained under optimized sulfurization reaction time of 10 h via anion exchange reaction between glycerate and sulfur ions. Finally, the structural and chemical compositions of CuCo-glycerate NSs and $CuCo_2S_4$ HMHNSs were confirmed through field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and electrochemical performances.
김준수(Junsu Kim),홍수민(Sumin Hong),김지현(Jihyun Kim),온정완(Jeongwan On),김찬우(Chanwoo Kim),Yihalem Yimolal Tiruneh,송지현(Jihyun Song),최선화(Sunhwa Choi),백승렬(Seungryul Baek) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
In this study, we address the class imbalance problem in the Real-life dataset, a challenging task due to the presence of a large number of small and visually similar objects. To mitigate the imbalance issue and improve the performance of the model, we propose a various solutions : Balanced Dataloader, CutMix, and RandomAugmentation.