Development of Assembled Steel Frame Seismic Retrofit System

Adane, Michael(아데인 마이클),Kim, Jinkoo(김진구) 대한건축학회 2022 대한건축학회 학술발표대회 논문집 Vol.42 No.2

Microbiota and Physicochemical Analysis on Traditional Kocho Fermentation Enhancer to Reduce Losses (Gammaa) in the Highlands of Ethiopia

( Adane Hailu Dibaba ),( Ashenafi Chaka Tuffa ),( Endrias Zewdu Gebremedhin ),( Gerbaba Guta Nugus ),( Girma Gebresenbet ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 한국미생물·생명공학회지 Vol.46 No.3

Warqe (Ensete ventricosum) has been traditionally fermented in an earthen pit to yield a carbohydrate-rich food product named kocho, for generations. A fermentation enhancer (gammaa) was added to this fermenting mass to enhance the fermentation process. The objectives of this study were to assess the physicochemical properties and microbiota of the kocho fermentation enhancer culture to reduce losses. Cross-sectional study design was implemented to collect 131 gammaa samples on the first day of fermentation. The samples were further classified into four groups according to the duration of fermentation (14, 21, 30, and 60 days) practised in various households traditionally. The results showed that the fermentation time significantly affected the physicochemical properties and microbial load of gammaa (p < 0.01). As the fermentation progressed from day 1 to 60, the pH decreased and the titratable acidity increased. The total coliform, Enterobacteriaceae, aerobicmesophilic bacteria (AMB), yeast, and mould counts were significantly reduced at the end of fermentation. In contrast, the number of lactic acid bacteria (LAB) increased significantly until day 30 of fermentation, because of the ability of the LAB to grow at low pH. Lactobacillus species from LAB isolates and Enter obacteriaceae from AMB isolates were the most abundant microorganisms in gammaa fermentation. However, the Enterobacteriaceae and Lactobacilli species count showed decreasing and increasing trends, respectively, as the fermentation progressed. These isolates must be investigated further to identify the species and strain, so as to develop gammaa at the commercial scale.

Seismic retrofit of framed structures using a steel frame assembly

Michael Adane,Seungho Chun,Jinkoo Kim 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.46 No.6

This study aimed to develop a seismic retrofit technique using a steel frame which can be easily transported and assembled on site. This enables the retrofit steel frame to be easily attached to an existing structure minimizing the unwanted gap between the structure and the steel frame assembly. A one-story one-bay RC frame was tested with and without seismic retrofit using the proposed steel frame to verify the seismic retrofit effect of the proposed system, and an analysis model was developed in Opensees for seismic performance evaluation of a case study soft first-story model structure retrofitted with the developed steel frame assembly. Seismic performance of the model structure was also evaluated considering soil structure interaction effect. The experimental study confirmed that the proposed seismic retrofit system can be applied effectively to improve the seismic performance of framed structures. Time history analysis results of the model structure showed that the proposed steel frame assembly was effective in increasing the seismic load resisting capacity of the soft first-story structure. However more steel frame assemblies were required to satisfy the given performance limit state of the model structure located on weak soil due to the negative soil-structure interaction effect.

Services Quality Improvement through Control Management Cloud-Based SLA

Abel Adane International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.5

Cloud-based technology is used in different organizations around the world for various purposes. Using this technology, the service providers provide the service mainly SaaS, PaaS and while the cloud service consumer consumes the services by paying for the service they used or accessed by the principle of "pay per use". The customer of the services can get any services being at different places or locations using different machines or electronic devices. Under the conditions of being well organized and having all necessary infrastructures, the services can be accessed suitably. The identified problem in this study is that cloud providers control and monitor the system or tools by ignoring the calculation and consideration of various faults made from the cloud provider side during service delivery. There are currently problems with ignoring the consumer or client during the monitoring and mentoring system for cloud services consumed at the customer or client level by SLA provisions. The new framework was developed to address the above-mentioned problems. The framework was developed as a unified modeling language. Eight basic components are used to develop the framework. For this research, the researcher developed a prototype by using a selected cloud tool to simulate and java programming language to write a code as well as MySQL to store data during SLA. The researcher used different criteria to validate the developed framework i.e. to validate SLA that is concerned with a cloud service provider, validate what happened when the request from the client-side is less than what is specified in SLA and above what is specified in SLA as well as implementing the monitoring mechanism using the developed Monitoring component. The researcher observed that with the 1st and 3rd criteria the service level agreement was violated and this indicated that if the Service level agreement is monitored or managed only by cloud service prover, there is a violation of LSA. Therefore, the researcher recommended that the service level agreement be managed by both cloud service providers and service consumers in the cloud computing environment.

Microbiota and Physicochemical Analysis on Traditional Kocho Fermentation Enhancer to Reduce Losses (Gammaa) in the Highlands of Ethiopia

Dibaba, Adane Hailu,Tuffa, Ashenafi Chaka,Gebremedhin, Endrias Zewdu,Nugus, Gerbaba Guta,Gebresenbet, Girma The Korean Society for Microbiology and Biotechnol 2018 한국미생물·생명공학회지 Vol.46 No.3

Warqe (Ensete ventricosum) has been traditionally fermented in an earthen pit to yield a carbohydrate-rich food product named kocho, for generations. A fermentation enhancer (gammaa) was added to this fermenting mass to enhance the fermentation process. The objectives of this study were to assess the physicochemical properties and microbiota of the kocho fermentation enhancer culture to reduce losses. Cross-sectional study design was implemented to collect 131 gammaa samples on the first day of fermentation. The samples were further classified into four groups according to the duration of fermentation (14, 21, 30, and 60 days) practised in various households traditionally. The results showed that the fermentation time significantly affected the physicochemical properties and microbial load of gammaa (p < 0.01). As the fermentation progressed from day 1 to 60, the pH decreased and the titratable acidity increased. The total coliform, Enterobacteriaceae, aerobicmesophilic bacteria (AMB), yeast, and mould counts were significantly reduced at the end of fermentation. In contrast, the number of lactic acid bacteria (LAB) increased significantly until day 30 of fermentation, because of the ability of the LAB to grow at low pH. Lactobacillus species from LAB isolates and Enter obacteriaceae from AMB isolates were the most abundant microorganisms in gammaa fermentation. However, the Enterobacteriaceae and Lactobacilli species count showed decreasing and increasing trends, respectively, as the fermentation progressed. These isolates must be investigated further to identify the species and strain, so as to develop gammaa at the commercial scale.

Exposure and inequity: assessing commuter vulnerability and the quality of noise environment on urban arterials

Vinayak Sakharam Adane,Surashmie Gawande 서울시립대학교 도시과학연구원 2020 도시과학국제저널 Vol.24 No.1

It is a well-established fact that a mobility corridor is a source of various street level noises impacting unprotected commuters. Although this fact is understood rarely has it been investigated to evince the category of commuters it affects or its intensity? The purpose of this study is to characterize and establish the noise environment, elicit the degree of noise exposure and establish the inequity that gets distributed in a common public space on vulnerable commuter categories. For this study noise levels were recorded at intersections and mid segments of corridors at 24 locations to assess the noise environments. The degree of exposure and equity were derived using a Semantic differential (SD) rating scale. The study consisted of two parts: noise survey and the traffic stream and modal attribute study. The results were analysed statistically and a rating scale developed to inform analysis and interpretation. The paper dwells on two related aspects of vulnerability; exposure and equity. The study reveals that at all locations surveyed noise levels remained far above prescribed limits. This study indicates the dominance of MT’s in terms of volume and road usage and showed that although slow commuters and NMT’s generated lesser noise on road environments inequity is foisted on them when compared to MT modes. Results indicate that the percentage of the total volume of non-motorized (NMT) commuters in the two road environments studied does not affect the noise climate. All noise descriptors indicate high noise emissions the sources of which are motorized transport as compared to the NMT’s which are susceptible and are comparatively more sensitive to this externality. The vulnerability score is derived on a rating scale. The vulnerability matrix and scores developed show high scores for slower modes indicative of the intensity of exposure based on factors evolved from the study.

Characterization of functional materials derived from tropical red seaweeds Hypnea musciformis produced by subcritical water extraction systems

Ratih Pangestuti,Adane Tilahun Getachew,Byung Soo Chun 한국수산과학회 양식분과 2018 한국수산과학회 양식분과 학술대회 Vol.2018 No.5

Development of a seismic retrofit system made of steel frame with vertical slits

Hyungoo Kang,Michael Adane,Seungho Chun,Jinkoo Kim 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.44 No.2

In this study, a new seismic retrofit scheme of building structures is developed by combining a steel moment frame and steel slit plates to be installed inside of an existing reinforced concrete frame. This device has the energy dissipation capability of slit dampers with slight loss of stiffness compared to the conventional steel frame reinforcement method. In order to investigate the seismic performance of the retrofit system, it was installed inside of a reinforced concrete frame and tested under cyclic loading. Finite element analysis was carried out for validation of the test results, and it was observed that the analysis and the test results match well. An analytical model was developed to apply the retrofit system to a commercial software to be used for seismic retrofit design of an example structure. The effectiveness of the retrofit scheme was investigated through nonlinear time-history response analysis (NLTHA). The cyclic loading test showed that the steel frame with slit dampers provides significant increase in strength and ductility to the bare structure. According to the analysis results of a case study building, the proposed system turned out to be effective in decreasing the seismic response of the model structure below the given target limit state.

Physicochemical characterization and deodorant activity of essential oil recovered from Asiasarum heterotropoides using supercritical carbon dioxide and organic solvents

J.N. Moon,Adane Tilahun Getachew,A.S.M. Tanbirul Haque,Periaswamy Sivagnanam Saravana,Y.J. Cho,David Nkurunziza,B.S. Chun 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-

This study was aimed to extract oil from Asiasarum heterotropoides using supercritical carbon dioxide (Sc-CO2) with and without ethanol as co-solvent and to compare the results with conventional extraction solvents. A total of 27 major volatile organic compounds (VOCs) were identified among them eucarvone, 3-carene, safrole, methyleugenol, and camphene were found to be the highest. The solvent Sc-CO2 + ethanol at 250 bar and 50 °C was found to be the best condition to get high yield of oil with 3.54 ± 0.21%. The extracted oil showed 100% of deodorant efficiency within 30 min of reaction with an artificially manufactured odorant.

Application of bacterial collagenolytic proteases for the extraction of type I collagen from the skin of bigeye tuna (<i>Thunnus obesus</i>)

Ahmed, Raju,Getachew, Adane Tilahun,Cho, Yeon-Jin,Chun, Byung-Soo Elsevier 2018 FOOD SCIENCE AND TECHNOLOGY -ZURICH- Vol.89 No.-

<P>Collagen extracted from fish skin by using porcine-derived pepsin is not accepted by a large number of people due to religious constrains. The aim of the study was to explore bacterial collagenolytic proteases (CP) to extract fish skin collagen and characterize the extracted collagen. Two bacteria, Bacillus cereus FORC005 and Bacillus cereus FRCY9-2 were isolated. Glycerol and sucrose were suitable carbon sources for FORC005 and FRCY9-2, respectively. Response surface methodology (RSM) was employed to optimize pH, temperature (T) and concentration of carbon source (CC) for producing maximum CP. The temperature and pH were the most influencing factors for producing CP by FORC005 and FRCY9-2, respectively. The total yield of collagen by FORC005 and FRCY9-2 CP treatments combined with acid soluble collagen were 188 g/kg and 177 g/kg, respectively of skin (dry matter basis). The SDS-PAGE band patterns, FT-IR spectra and amino acid compositions indicated that all extracted collagens were type I collagen. The CPs produced from the bacteria were able to extract collagen from fish skin. This study provides an alternative approach for producing collagen from fish skin using CP.</P>