• Title/Summary/Keyword: Education Potential

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Modeling the wetting deformation behavior of rockfill dams

  • Guo, Wanli;Chen, Ge;Wu, Yingli;Wang, Junjie
    • Geomechanics and Engineering
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    • v.22 no.6
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    • pp.519-528
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    • 2020
  • A mathematical wetting model is usually used to predict the deformation of core wall rockfill dams induced by the wetting effect. In this paper, a series of wetting triaxial tests on a rockfill was conducted using a large-sized triaxial apparatus, and the wetting deformation behavior of the rockfill was studied. The wetting strains were found to be related to the confining pressure and shear stress levels, and two empirical equations, which are regarded as the proposed mathematical wetting model, were proposed to express these properties. The stress and deformation of a core wall rockfill dam was studied by using finite element analysis and the proposed wetting model. On the one hand, the simulations of the wetting model can estimate well the observed wetting strains of the upstream rockfill of the dam, which demonstrated that the proposed wetting model is applicable to express the wetting deformation behavior of the rockfill specimen. On the other hand, the simulated additional deformation of the dam induced by the wetting effect is thought to be reasonable according to practical engineering experience, which indicates the potential of the model in dam engineering.

Localized evaluation of actuator tracking for real-time hybrid simulation using frequency-domain indices

  • Xu, Weijie;Guo, Tong;Chen, Cheng
    • Structural Engineering and Mechanics
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    • v.62 no.5
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    • pp.631-642
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    • 2017
  • Accurate actuator tracking plays an important role in real-time hybrid simulation (RTHS) to ensure accurate and reliable experimental results. Frequency-domain evaluation index (FEI) interprets actuator tracking into amplitude and phase errors thus providing a promising tool for quantitative assessment of real-time hybrid simulation results. Previous applications of FEI successfully evaluated actuator tracking over the entire duration of the tests. In this study, FEI with moving window technique is explored to provide post-experiment localized actuator tracking assessment. Both moving window with and without overlap are investigated through computational simulations. The challenge is discussed for Fourier Transform to satisfy both time domain and frequency resolution for selected length of moving window. The required data window length for accuracy is shown to depend on the natural frequency and structural nonlinearity as well as the ground motion input for both moving windows with and without overlap. Moving window without overlap shows better computational efficiency and has potential for future online evaluation. Moving window with overlap however requires much more computational efforts and is more suitable for post-experiment evaluation. Existing RTHS data from Network Earthquake Engineering Simulation (NEES) is utilized to further demonstrate the effectiveness of the proposed approaches. It is demonstrated that with proper window size, FEI with moving window techniques enable accurate localized evaluation of actuator tracking for real-time hybrid simulation.

Heterologous Expression of Recombinant Transglutaminase in Bacillus subtilis SCK6 with Optimized Signal Peptide and Codon, and Its Impact on Gelatin Properties

  • Wang, Shiting;Yang, Zhigang;Li, Zhenjiang;Tian, Yongqiang
    • Journal of Microbiology and Biotechnology
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    • v.30 no.7
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    • pp.1082-1091
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    • 2020
  • Microbial transglutaminases (MTGs) are widely used in the food industry. In this study, the MTG gene of Streptomyces sp. TYQ1024 was cloned and expressed in a food-grade bacterial strain, Bacillus subtilis SCK6. Extracellular activity of the MTG after codon and signal peptide (SP Ync M) optimization was 20 times that of the pre-optimized enzyme. After purification, the molecular weight of the MTG was 38 kDa and the specific activity was 63.75 U/mg. The optimal temperature and pH for the recombinant MTG activity were 50℃ and 8.0, respectively. MTG activity increased 1.42-fold in the presence of β-ME and 1.6-fold in the presence of DTT. Moreover, 18% sodium chloride still resulted in 83% enzyme activity, which showed good salt tolerance. Cross-linking gelatin with the MTG increased the strength of gelatin 1.67 times and increased the thermal denaturation temperature from 61.8 to 75.8℃. The MTG also significantly increased the strength and thermal stability of gelatin. These characteristics demonstrated the huge commercial potential of MTG, such as for applications in salted protein foods.

A study on the Robust and Systolic Topology for the Resilient Dynamic Multicasting Routing Protocol

  • Lee, Kang-Whan;Kim, Sung-Uk
    • Journal of information and communication convergence engineering
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    • v.6 no.3
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    • pp.255-260
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    • 2008
  • In the recently years, there has been a big interest in ad hoc wireless network as they have tremendous military and commercial potential. An Ad hoc wireless network is composed of mobile computing devices that use having no fixed infrastructure of a multi-hop wireless network formed. So, the fact that limited resource could support the network of robust, simple framework and energy conserving etc. In this paper, we propose a new ad hoc multicast routing protocol for based on the ontology scheme called inference network. Ontology knowledge-based is one of the structure of context-aware. And the ontology clustering adopts a tree structure to enhance resilient against mobility and routing complexity. This proposed multicast routing protocol utilizes node locality to be improve the flexible connectivity and stable mobility on local discovery routing and flooding discovery routing. Also attempts to improve route recovery efficiency and reduce data transmissions of context-awareness. We also provide simulation results to validate the model complexity. We have developed that proposed an algorithm have design multi-hierarchy layered networks to simulate a desired system.

Inquiry of Water Environment in Mihocheon (Stream) - Water Quality Monitoring focused on TOC - (미호천의 물 환경 탐구 - TOC를 중심으로 한 수질모니터링 -)

  • Lyu, Jai Hong;Lee, Du Gon
    • Journal of Korean Society on Water Environment
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    • v.23 no.5
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    • pp.731-739
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    • 2007
  • In this study, water quality monitoring focused on TOC was performed at 5 points in Mihocheon (Stream) from January to December 2006. And 10 parameters (water temperature, pH, DO, EC, turbidity, SS, BOD, $PO_4-P$, TOC, TN) were monitored every month for one year. According to this study, TOC increased towards the lower stream (#4~#5). Correlation coefficients between TOC and DO, EC, turbidity, SS, BOD, $PO_4-P$, TN were -0.126, 0.351, 0.320, 0.286, 0.711, 0.525, 0.666. TOC was highly related to BOD. As a result of linear regression analysis, regression equation between BOD and TOC was BOD=0.58TOC+1.90 ($R^2=0.506$). In Mihocheon (Stream), BOD/TOC ratio decreased towards the lower stream. This results show decrease of ratio of biodegradable organic material to total organic pollutants towards the lower stream. This study is significant since it has revealed the potential value of TOC as organic material indicator for inquiry of water quality characteristics in the natural water system.

Mentoring Experience of Nursing Students Participating in a Health Promotion Program for Elementary School Students (간호대학생의 초등학생 대상 심신 건강증진 프로그램의 멘토링 경험)

  • Kim, Sungjae;Bang, Kyung-Sook;Kang, Kyungim;Song, Minkyung
    • The Journal of Korean Academic Society of Nursing Education
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    • v.24 no.2
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    • pp.137-148
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    • 2018
  • Purpose: The purpose of this study was to explore the monitoring experience of nursing students and to suggest considerations when developing mentoring programs. Methods: This qualitative study was conducted by online surveys and individual interviews with 7 nursing students who participated in the health promotion program as mentors. Data were analyzed using qualitative content analysis to identify motives for participating in mentoring and to explore their changes through mentoring. Results: The results were as follows: Motives for participating were 'inquisitiveness about children', 'interest in mentoring activities' and 'curiosity about research'. Recognition of mentor roles were 'actively involved guide', 'exemplary role model' and 'empathetic emotional supporter'. Changes through mentoring experiences were revealed by 'understanding the characteristics of children', 'improvement of interaction ability with children', 'understanding self and changes' and 'recognition of excellence in forest activities'. Conclusion: Nursing students had opportunities to learn the characteristics of general children and to understand themselves through natural interaction. Participation in mentoring has the potential to be a creative educational method of field learning as a form of service learning.

Systematic Literature Review on Cloud Adoption

  • Bagiwa, Idris Lawal;Ghani, Imran;Younas, Muhammad;Bello, Mannir
    • International Journal of Internet, Broadcasting and Communication
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    • v.8 no.2
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    • pp.1-22
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    • 2016
  • While many organizations believe that cloud computing has the potential to reduce operational cost by abstracting capital assets like data storage center and processing systems into a readily on demand available and affordable operating expenses, still many of these organizations are not aware of the factors determining the performance of cloud computing technology. This paper provides a systematic literature review focusing on the factors determining the performance of cloud computing. In trying to come up with this review, the following sources were searched for relevant articles: ScienceDirect, Scientific.Net, ACMDigital Library, IEEE Xplore, Springer, World Scientific Journal, Wiley Online Library, Academic Search Premier (via EBSCOHost) and EdITLib (Education & Information Technology Digital Library). In first search strategy, approximately 100 keywords related to the research domain like; "Cloud Computing" and "Cloud Services" were used. In second search strategy, 65 keywords more related to the research domain were selected. In the third search strategy, the primary materials were identified and classified according to the paper types (Journal or Conference), year of publication and so on. Based on this study, twenty (20) factors were found that determine the performance of cloud computing. The IT organization needs to consider these twenty (20) factors in order to adopt cloud computing.

Effective Strategies for Teaching a Web-based Programming Course (웹 기반 프로그래밍 과목의 효과적인 강의 전략)

  • Lee, Chungki;Hong, Sukwon
    • The Journal of Korean Association of Computer Education
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    • v.7 no.3
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    • pp.1-14
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    • 2004
  • The demand for learning programming anywhere at a low cost at any time is increasing. Accordingly, there have been a great number of web-based programming courses. Generally, teaching Web-based programming classes is very challenging. Thus effective methods for teaching these courses should be researched. Based on several years of experiences in teaching a Web-based programming course as well as the related literature, this paper presents its effective teaching strategies. First, some design strategies of its course contents for developing programming skills are proposed, considering the characteristics of programming courses as well as potential learners. Next, its effective assessment and class management strategies are proposed. Finally, we evaluate the results of student grades and operation of a Web-based programming course offered most recently using proposed strategies. They demonstrate that we can enhance learning effects of the course.

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Development of Assessment Model for the 'Information Society and Computer' subject of the 7th National Curriculum (7차 교육과정에 따른 '정보사회와 컴퓨터' 교과의 평가도구 개발)

  • Lee, Seung-hyun;Kwak, Eun-young;Kim, Hyeon-cheol
    • The Journal of Korean Association of Computer Education
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    • v.7 no.1
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    • pp.15-25
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    • 2004
  • In this study, we present an assessment model for the 'Information Society and Computer' subject of the 7th National High School Curriculum. The Assessment model is developed to improve the quality of the curriculum by considering both of the objective of the National Curriculum and the property of the subject. To develop the assessment model, we analyzed textbooks used in most schools, developed achievement standards, classified assessment areas and standards. Adequacy and potential practice of the assessment model is also reviewed and evaluated by subject experts.

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Policy Directions for Human Resources Development in the New Growth Engine Industries Based on the Analysis of the U.S. Green Job Training Framework (미국의 그린직업훈련체계 분석을 통한 우리나라 신성장동력분야 인력양성 정책방향 도출)

  • Om, Kiyong;Lee, Moonsu;Kwon, Oh-Young;Rim, Kyung-Hwa
    • The Journal of Korean Institute for Practical Engineering Education
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    • v.4 no.1
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    • pp.119-131
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    • 2012
  • This study investigated the U.S. green job training framework and specific training programs designed to respond to diverse green skill needs of industry at the federal and state level, and looked for policy directions for improving governmental job training programs in the field of new growth engine industries of Korea. As with any training program, training programs for green jobs should be responsive to the particular economic growth potential, employer needs, and workforce realities in a given country or region. The findings of the study are expected to contribute to enhancing the effectiveness of the Korean job training programs in the new growth engine industries.

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