Evaluating E-Government Implementation in Public Service Delivery

( Desta Kenenissa ),( Yoon C. Cho ) 서암순창장학회 2017 Journal of Marketing Thought Vol.4 No.1

The purpose of this study is to assess e-government implementation in public service delivery and to examine stakeholders/customers trust on e-government service. This study applied the Technology Acceptance Model (TAM: Davis, Bagozzi, & Warshaw 1989) to investigate the factors affecting e-government implementation. The results indicate that factors including ICT infrastructure, human capital, online service, and risks and barriers significantly affect the ease of use and usefulness of e-government services. This study also examined the intention to improve egovernment service by selected organizations and service provider perception of stakeholder/customer trust in the egovernment service provided. This study also finds that the intention to improve e-government service is better in all selected organizations, whereas perceived stakeholders’/customers’ trust level in e-government service is similar across all selected organizations which is insignificant.

Flavone polyphenols dominate in Thymus schimperi Ronniger: LC-ESI-MS/MS characterization and study of anti-proliferative effects of plant extract on AGS and HepG2 cancer cells

Desta, K.T.,Kim, G.S.,El-Aty, A.M.A.,Raha, S.,Kim, M.B.,Jeong, J.H.,Warda, M.,Hacimuftuoglu, A.,Shin, H.C.,Shim, J.H.,Shin, S.C. Elsevier 2017 Journal of chromatography. B, Analytical technolog Vol.1053 No.-

Thymus schimperi is a highly localized and a rare plant endemic to Ethiopia. An optimized and validated high-performance liquid chromatography-electrospray ionization-tandem mass spectrometry (HPLC-ESI-MS/MS) method was applied to characterize 23 polyphenolic compounds found in ethyl acetate extracts of the plant. From those, flavones dominated and luteolin was the major component contributing 21.83% of the total composition (or 46.05+/-0.59g/kg of fresh sample weight). Validation data showed a determination coefficient (R<SUP>2</SUP>)≥0.997. Limits of detection (LOD) and quantification (LOQ) were 0.03-0.97 and 0.11-3.23mg/L, while recovery values spiked at 5 and 50mg/L were between 70.89-115.39 and 67.65-120.19%, respectively. Except for caffeic acid and epicatechin gallate, the relative standard deviations (%RSDs) were far below 15%, showing acceptable precision values. The plant extracts inhibited cell proliferation and induced cell death in human gastric adenocarcinoma (AGS) and liver hepatocellular carcinoma (HepG2) cancer cells. This is the first report of polyphenolic components from T. schimperi being characterized using HPLC-ESI-MS/MS. Being components of many edible vegetables, fruits, and spices, the identified polyphenols suggest that T. schimperi could be a potential food with promising health benefits.

A Model to Investigate the Security Challenges and Vulnerabilities of Cloud Computing Services in Wireless Networks

Desta Dana Data International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.10

The study provides the identification of vulnerabilities in the security issues by Wireless Network. To achieve it the research focus on packet flow analysis, end to end data communication, and the security challenges (Cybercrime, insider threat, attackers, hactivist, malware and Ransomware). To solve this I have used the systematic literature review mechanisms and demonstrative tool namely Wireshark network analyzer. The practical demonstration identifies the packet flow, packet length time, data flow statistics, end- to- end packet flow, reached and lost packets in the network and input/output packet statics graphs. Then, I have developed the proposed model that used to secure the Wireless network solution and prevention vulnerabilities of the network security challenges. And applying the model that used to investigate the security challenges and vulnerabilities of cloud computing services is used to fulfill the network security goals in Wireless network. Finally the research provides the model that investigate the security challenges and vulnerabilities of cloud computing services in wireless networks

Genotype X environment interaction and stability analysis in upland rice (Oryza sativa L.) varieties in Ethiopia

Abebe Desta,Mohammed Wassu,Tesfaye Abush 한국작물학회 2023 Journal of crop science and biotechnology Vol.26 No.1

Determination of the genotype x environment interaction (GEI) and stability of upland rice varieties for grain yield provides the basis to identify high-yielding and stable upland rice varieties across diferent environments and to delineate and identify rice mega environments in Ethiopia. Twenty rice varieties were laid out in a randomized complete block design with three replications and evaluated across six locations that represent the major rice growing agro-ecologies in the country. The combined analysis of variance over environments revealed signifcant diferences among genotypes, environments and GEI for grain yield. The signifcant GEI implicated the diferential response of the genotypes in diferent environments and demonstrated the remarkable efect of GEI on the performance of the genotypes. The partitioning of GEI based on the AMMI model revealed that only the frst two terms of AMMI were signifcant. The E and GEI had a higher contribution than G for most of the traits, and GEI had larger contribution than G and E to the variations in the studied varieties for yield. The Interaction Principal Component Axis one (IPC1) and two (IPC2) contributed to 55.1% and 24.8% of the GEI sum of squares, respectively. NERICA-3, Hidasse and Chewaqa varieties were identifed as responsive to changing environments and the frst three best varieties across poor to most favorable environments. NERICA-12 and ADET were identifed as the most stable and widely adapted varieties based on most of the stability parameters. NERICA-4, NERICA-13 and Getachew varieties were identifed as stable varieties by most of the stability parameters and selected as the frst three best varieties at poor to average environments. In conclusion, this study revealed that GE interactions were an important source of rice yield variation, and its AMMI biplots were forceful for visualizing the response of genotypes to environments.

Effect of the Curing Condition and High-Temperature Exposure on Ground-Granulated Blast-Furnace Slag Cement Concrete

Eskinder Desta Shumuye,Jun Zhao,Zike Wang 한국콘크리트학회 2021 International Journal of Concrete Structures and M Vol.15 No.3

In this study, the effect of curing temperature on the properties of slag cement concrete after high-temperature exposure was studied, and elevated curing temperature (45 ± 2 ℃ and 95% relative humidity (RH)) was selected to compare with the standard curing temperature (20 ± 2 ℃ and 95%RH). Four different concrete mixes with the same mix proportion, except for different slag replacement ratios, were used: 0% (reference), 30% (slag), 50% (slag), and 70% (slag). After high-temperature exposure at 200, 400, 600, and 800 ℃, the effect of slag replacement, high temperature, and curing temperature on the compressive strength and mineralogical and microstructural properties of slag cement concrete were studied. Test results indicated that the compressive strength of concrete cured for 7 d at elevated temperatures increased by 28.2, 20.7, 28.8, and 14.7% compared with that cured at the standard curing condition at slag percentages of 0, 70, 50, and 30%, respectively. X-ray diffraction (XRD) and Scanning electron microscope (SEM) results revealed that concrete cured at elevated temperatures exhibited a more condensed phase and contained a higher percentage of hydrates than that cured for 7 d in the standard curing condition. However, after 56 d of curing, concrete in the standard curing condition exhibited a more stable phase and a higher concentration of hydrates.

Agro-morphological Characterization of Korean, Chinese, and Japanese Adzuki Bean (Vigna angularis (Willd.) Ohwi & Ohashi) Genotypes

Kebede Taye Desta,최유미,이정윤,이석영,신명재,Xiaohan Wang,윤혜명 한국작물학회 2023 한국작물학회지 Vol.68 No.1

Adzuki beans have gained popularity in recent years due to their health benefits. Breeding of Adzuki beans is less favorable than with other legumes due to low genetic diversity. This study aimed to evaluate the genetic diversity of 252 adzuki bean germplasms from China, Japan, and Korea using 18 agro-morphological parameters and comparing their performance to three prominent Korean cultivars: Geomguseul, Arari, and Chungjupat. Leaf shape, pod color, and seed coat color were among the qualitative traits that showed wide variations. The quantitative variables also showed wide variations among adzuki bean germplasms. Although there was no significant difference (p < 0.05), the average rate of germination declined in the order of Korean (91.44%) > Chinese (91.31%) > Japanese (87.47%) adzuki beans. Chinese adzuki beans needed fewer days to flower (DF, 58.22 days) and days to mature (DM, 107.13 days), which varied significantly compared to the Korean and Japanese adzuki beans (p < 0.05). The average number of pods per plant (PPP) and one-hundred seeds weight (HSW) were higher in Japanese adzuki beans compared to the Korean and Chinese adzuki beans although the variation of each was not significant. Almost 29.76% of the accessions had early-blooming flowers, 3.97% were premature, 21.43% produced more PPP, and 3.97% yielded more SPP compared to control cultivars. Results of hierarchical cluster and principal component analyses revealed three clusters with significant variation in all quantitative variables except for RG (p < 0.05). The key factors in multivariate analyses were DF, DM, and HSW. Our study investigated the genetic diversity of adzuki bean accessions and identified ten early maturing and ten high PPP-yielding accessions. Our findings would help farmers and breeders to select the top-performing accessions that can provide them with various options.

Assessment of Phenolic Content, Saponin Content, and Antioxidant Activities in Gray, Red, and White Adzuki Bean Germplasm: A Multivariate Analysis

Kebede Taye Desta,윤혜명(Hyemyeong Yoon),신명재(Myoung-Jae Shin),이수경(Sukyeung Lee),Xiaohan Wang,최유미(Yu-Mi Choi),전영아(Young-ah Jeon),주영광(YoungKwang Ju),이정윤(JungYoon Yi) 한국작물학회 2023 한국작물학회지 Vol.68 No.3

Seed color is controlled by several genes and is a key trait in determining the metabolite content and biological activities of legume genotypes. In this study, 296 adzuki bean accessions, including 159 grey, 99 red, and 38 white adzuki beans, were grown in Korea. Variations in total phenolic content (TPC), total saponin content (TSC), DPPH• scavenging activity, ABTS•+ scavenging activity, and ferric reducing antioxidant power (FRAP) were assessed and were reported to be in the ranges of 1.52- 8.24 mg GAE/g, 14.36-114.22 mg DE/g, 0.23-12.84 mg AAE/g, 1.05-17.66 mg TE/g, and 0.59-13.14 mg AAE/g, respectively, with a wide variation across adzuki beans. Except for DPPH• scavenging activity, the average values declined in the order gray > red > white adzuki beans, each demonstrating a significant variation (p < 0.05). White adzuki beans, which showed low metabolite content and antioxidant activity, were clearly separated from the gray and red genotypes using principal component and hierarchical cluster analyses. Moreover, TPC, TSC, and antioxidant activities were strongly correlated, regardless of seed color. Overall, the diversity of the TPC, TSC, and antioxidant activity in a broad population of adzuki bean genotypes was determined. Furthermore, this study found that seed color variation in adzuki beans had a significant effect on the metabolite content and antioxidant activity. Superior accessions with high levels of TPC, TSC, and antioxidant activity were also discovered and could be used for functional plant breeding and human consumption. The findings of this study may be useful for understanding the relationship between seed coat color and metabolite concentration in adzuki beans, paving the way for molecular-level analyses.

Performance Analysis of MIMO Multi Band OFDM System for UWB Communication

Y. T. Desta,Jiang Tao,Sambourou Massinanke 보안공학연구지원센터 2013 International Journal of Future Generation Communi Vol.6 No.4

Identification of Adaptive Traits Facilitating the Mechanized Harvesting of Adzuki Bean (Vigna angularis)

Xiaohan Wang(Xiaohan Wang),Yu-Mi Choi(Yu-Mi Choi),Sukyeung Lee(Sukyeung Lee),Myoung-Jae Shin(Myoung-Jae Shin),Jung Yoon Yi(Jung Yoon Yi),Kebede Taye Desta(Kebede Taye Desta ),Hyemyeong Yoon(Hyemyeong 한국자원식물학회 2022 한국자원식물학회지 Vol.35 No.6

Traditional germplasms are unsuitable for mechanized production, limiting adzuki bean production. The creation of cultivars that can be harvested by mechanized means is an urgent task for breeders. The bottom pod height (BPH), lodging resistance, and synchronous maturing of adzuki beans are critical factors for the reduction of losses due to mechanized harvesting. In this study, 14 traits of 806 adzuki bean accessions were analyzed. All growth stages and the yield, lodging score, and synchronous maturing correlated negatively with the BPH. These negative correlations reflect the increased difficulty of breeding to simultaneously satisfy the needs for no lodging, high synchronous maturing rates, BPHs > 10 ㎝, and high yield. We screened three germplasms with no lodging, high synchronous maturing rates, and BPHs > 10 ㎝ that were used as mechanization-adapted breeding material for crossing with high-yield cultivars. Agronomic trait diversity in adzuki beans was also examined in this study. Principal component and cluster analyses were conducted for 806 germplasms resulting in three clusters with the yield and three growth stage traits serving as the main discriminating factors. Cluster 1 included high-yield germplasms with the number of pods per plant and the number of seeds per pod being the major discriminant factors. Cluster 2 included germplasms with long growth periods and large 100-seed weights while cluster 3 contained germplasms with high BPHs. In general, the characteristics that make mechanical harvesting feasible and those assessed in this study could be utilized to choose and enhance adzuki beans production.

[PC-0010] Evaluation of morphological characters, phytochemical contents and antioxidant activities of amaranth leaves

Weilan Li(Weilan Li),Eun Ae Yoo(Eun Ae Yoo),SooKyeong Lee(SooKyeong Lee),Hyung Jun Noh(Hyung Jun Noh),So Jeong Hwang(So Jeong Hwang),Kebede Taye Desta(Kebede Taye Desta ),Gi-An Lee(Gi-An Lee) 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-