• Title/Summary/Keyword: 구성 수준

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Preparation and characterization of Environmental Functional Nanofibers by electrospun nanofibers-Dry sorption material for indoor CO2 capture (정전방사를 통한 환경기능성 미세섬유 제조 및 특성분석 - 실내환경 CO2 포집용 건식흡착소재)

  • Kim, Eun Joo;Park, Kyung-Ryul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.12
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    • pp.938-943
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    • 2018
  • Thin nano-sized fibres were prepared by an electrospinning method. The spinning appratus consisted of pump for polymer injection, nozzle and nozzle rotus, and an aluminum plate collected the polymer fibers. Its surface was chemically modified for selective improved adsorption of carbon monoxide at indoor level. The chemical activation enabled to form the fibres 250-350 nm in thickness with pore sizes distributed between 0.6 and 0.7 nm and an average specific surface area of $569m^2/g$. The adsorption capacities of pure (100%) and indoor (0.3%) $CO_2$, of which level frequently appears, at the ambient condition were improved from 1.08 and 0.013 to 2.2 and 0.144 mmol/g, respectively. It was found that the adsorption amount of $CO_2$ adsorbed by the chemically activated carbon nanofiber prepared through chemical activation would vary depending on the ratio of specific surface area and micropores. In particular, chemical interaction between adsorbent surface and gas molecules could enhance the selective capture of weak acidic $CO_2$.

A Basic Study on Effective Adjustment Method for Construction Escalation/De-Escalation Price (건설공사 중 물가변동에 따른 효율적인 계약금액 조정에 관한 기초 연구)

  • Sung, Ju-yong;Kim, Dong-jin;Lee, Min-jae
    • Korean Journal of Construction Engineering and Management
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    • v.20 no.3
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    • pp.3-11
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    • 2019
  • The construction of a facility is an act whereby infrastructure such as roads and railways and other facilities such as housing and office spaces are constructed, and due to the characteristics of the relevant industry where such construction is carried out in a custom order method, it requires a long period of time mostly. While the construction is carried out over a long period of time, fluctuations in the price of raw materials required for the construction occur. Therefore, the cost of the construction also fluctuates inevitably. The fluctuation of the construction cost meshes closely with the profit of a constructor and the efficiency of government spending. Therefore, it is necessary to maintain the construction cost at a reasonable level by adjusting the construction cost rationally in order to secure the required construction quality and spend the budget efficiently. The buffer system for solving such problem is the contract amount adjustment system by fluctuations in prices (Escalation/De-Escalation). In this study, the method combining the escalation method based on the item adjustment method was suggested for an efficient contract amount adjustment method. In addition, it is proposed that there be an investigation and codification of matters not applied to government acts and regulations on contracts related to the adjustment of fluctuations in prices legally.

Policy Suggestions for Korean Research Equipment Industry According to the State of Construction of National Research Facility and Equipment by Country of Manufacture : Focusing on Basic and Analytical Science Field (제조국가별 국가연구시설장비 구축 현황에 따른 국산연구장비 산업 활성화 정책 제언: 기초·분석과학 분야 중심으로)

  • Kim, Chang-Yong;Chung, Taewon;Kong, Jaehyun;Seo, In-Su;Park, Chan-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.5
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    • pp.322-333
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    • 2019
  • The purpose of the current study was to investigate the level of market size and market share of domestic research equipments for analyzing the difference of the number and amount of construction by the manufacturing countries in the basic and analytical science fields based on the information of the research equipment invested by the Korean government for the past 14 years. As of January 1 2019, from 2005 to 2018, 20,687 research facilities & equipments (main equipment with a construction cost of 30 million won or more) built in the basic and analytical science fields were selected for this study and their components, standard classification, number of construction, and amount of construction by country of manufacture were analyzed. Differences of the number and amount of construction among manufacturing countries were tested using a single sample chi-square test and one-way analysis of variance, followed by Bonferroni's post-hoc test. As a result of this study, the number of construction (p<.001) and construction amount (p<.05) were statistically different for each manufacturing country. The level of market size and market share was significantly different according to the equipment standard classification (p<.05). Therefore, differentiated strategies of the government and policy research projects will be required for each type of equipment and amount in order to support the policy for the localization of research equipment.

Effects of Smart Home on Performance and Satisfaction of Activities of Daily Living of Wheelchair Users (스마트 홈이 휠체어를 사용하는 장애인의 일상생활활동 수행도와 만족도에 미치는 영향)

  • Woo, Ji-Hee;Kim, Jeong-Hyun;Kim, Jongbae
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.7
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    • pp.242-248
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    • 2019
  • This study was conducted to examine the effects of a smart home (electronic control unit, ECU) on the performance and satisfaction of activities of daily living of wheelchair users. A total of 15 wheelchair users (10 patients with spinal cord injury and 5 patients with stroke) were investigated. Smart homes were equipped with ECU technology, which consisted of automation of furniture and products. The products and facilities were integrated and controlled by a smart device or voice. Performance and satisfaction of activities of daily living were measured by the Canadian Occupational Performance Measure (COPM) before and after residence in a smart home. All participants showed a higher COPM (performance score ${\geq}3$, satisfaction score ${\geq}4$) during residence in a smart home compared to residence in the current home. In addition, the COPM scores differed significantly before and after residence in a smart home. These results provide evidence of the applicability of smart homes based on high technology. However, additional studies of more smart home participants should be conducted to improve the quality of the results.

Design and Evaluation of an Efficient Flushing Scheme for key-value Store (키-값 저장소를 위한 효율적인 로그 처리 기법 설계 및 평가)

  • Han, Hyuck
    • The Journal of the Korea Contents Association
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    • v.19 no.5
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    • pp.187-193
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    • 2019
  • Key-value storage engines are an essential component of growing demand in many computing environments, including social networks, online e-commerce, and cloud services. Recent key-value storage engines offer many features such as transaction, versioning, and replication. In a key-value storage engine, transaction processing provides atomicity through Write-Ahead-Logging (WAL), and a synchronous commit method for transaction processing flushes log data before the transaction completes. According to our observation, flushing log data to persistent storage is a performance bottleneck for key-value storage engines due to the significant overhead of fsync() calls despite the various optimizations of existing systems. In this article, we propose a group synchronization method to improve the performance of the key-value storage engine. We also design and implement a transaction scheduling method to perform other transactions while the system processes fsync() calls. The proposed method is an efficient way to reduce the number of frequent fsync() calls in the synchronous commit while supporting the same level of transaction provided by the existing system. We implement our scheme on the WiredTiger storage engine and our experimental results show that the proposed system improves the performance of key-value workloads over existing systems.

Comparison of Loop-Mediated Isothermal Amplification and Real-Time PCR for the Rapid Detection of Salmonella Typhimurium, Listeria monocytogenes and Cronobacter sakazakii Artificially Inoculated in Foods (식품에 인위접종된 Salmonella Typhimurium, Listeria monocytogenes, Cronobacter sakazakii의 신속검출을 위한 Real-time PCR과 Loop-mediated isothermal amplification 비교)

  • Kim, Jin-Hee;Oh, Se-Wook
    • Journal of Food Hygiene and Safety
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    • v.34 no.2
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    • pp.135-139
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    • 2019
  • The objective of this research was to compare loop-mediated isothermal amplification (LAMP) with real-time polymerase chain reaction (PCR) for the rapid detection of pathogens in foods. In this study, the limits of detection (LODs) for Salmonella Typhimurium, Listeria monocytogenes, and Cronobacter sakazakii were evaluated in various foods. Among 11 samples tested for S. Typhimurium, LAMP and real-time PCR had the same LODs in beef and duck meat whereas real-time PCR was more sensitive than the LAMP in 8 samples. However, S. Typhimurium in chocolate samples was not detected by real-time PCR. The sensitivity of real-time PCR was high in all samples inoculated with L. monocytogenes and C. sakazakii whereas LAMP was more sensitive than real-time PCR in oil-rich foods. Therefore, LAMP can be shown as an easrer, more convenient method, as well as effective analytical method for testing difficult samples when employed in PCR.

The Effect of Role Model on Entrepreneurial Self-Efficacy and Entrepreneurial Intention: Focused on Korean and Chinese University Students (창업역할모델이 창업자기효능감과 창업의도에 미치는 영향: 한국과 중국대학생들을 중심으로)

  • Yang, Jun-Hwan
    • Asia-Pacific Journal of Business Venturing and Entrepreneurship
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    • v.14 no.2
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    • pp.211-220
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    • 2019
  • Role model has received remarkable attentions in entrepreneurship literature over long time but majority of studies were conducted in western context. As an explorative study, this paper attempted to replicate the effect of role model in eastern context based on the discussions in the literature, using total 440 samples made of Korean and Chinese university students. This study examined the impact and effectiveness of role model on promoting entrepreneurship of university students, considering the main stream of entrepreneurship study has been concentrated on the effect of entrepreneurial education. Our findings presented that role model had a positive impact on both entrepreneurial self-efficacy and entrepreneurial intention of Korean and Chinese university students. Also, entrepreneurial self-efficacy had a significant and positive relationship with entrepreneurial intention of university students. The result of this study implies that role model need to be factored into entrepreneurship education curriculum in order to make it more effective and powerful promotional and educational tool for young university students. Theoretical and practical implications were presented based on the findings of this study.

A Shinpung Typed Large Grain and High-Yielding Peanut Variety 'Daan' (단경 소분지 대립 다수성 땅콩 신품종 '다안')

  • Pae, Suk-Bok;Lee, Myoung-Hee;Kim, Sung-Up;Hwang, Chung-Dong;Oh, Ki-Won;Jung, Chan-Sik;Song, Deok-Young;Baek, In-Youl;Lee, Young-Hee
    • Korean Journal of Breeding Science
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    • v.49 no.3
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    • pp.224-229
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    • 2017
  • A new peanut variety 'Daan'(Arachis hypogaea ssp. hypogaea L.) was developed at the Department of Southern Area Crop Science, National Institute of Crop Science (NICS) in Milyang 2014. This was developed from the cross between 'Iksan 31' with Virginia typed short stem and 'Dakwang' with Shinpung-typed larger grain. 'Daan' which is a Shinpung plant type had 13 branches per plant and its length of main stem was 44cm. Each pod has two grains with brown testa and long ellipse-shaped large kernel. Its yield components showed 34 pods per plant, 127 g of 100-seed-weight and 75% of pod shelling ratio in the regional yield trials (RYT). Seed quality showed 47.8% of crude oil and 28.3% of protein content. This variety showed resistant to early leaf spot and had more resistant to late leaf spot, stem rot and lodging, compared to reference variety. In the regional yield trials for 3 years 'Daan' was more productive than reference variety by 16% with 5.00 MT/ha for grain production.

An Analysis of Pre-service Early Childhood Education Teachers' Perceptions and Demands through Demonstration of Simulated Instruction (예비유아교사의 모의수업 인식 및 요구도 분석)

  • Park, So-Yun;Seo, Hyun-Ah
    • The Journal of the Korea Contents Association
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    • v.21 no.4
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    • pp.370-381
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    • 2021
  • This study examines the perceptions and demands of pre-service early childhood teachers about the Demonstration of simulated instruction for 350 students in early childhood education at 3-4 years university located in Busan, Ulsan, and Gimhae. And through this, the purposes of study are to provide basic data based on the current level of pre-school teachers for instructors leading simulated instruction and to seek effective management plans for simulated instruction to improve teaching ability. As a result of the study, pre-service early childhood teachers recognized that simulated instructions were necessary in teacher training course and helped to improve teaching ability, but they did not actively agree to expand simulated instructions and were not very satisfied with the methods of instructors in demonstration of simulated instruction. They wanted to receive feedback from instructors who have practical teaching knowledge and skills based on field experience at least two times during preparation stage and evaluation stage of the simulated instructions. And they wanted to be guided specifically on principles and methods of preparing educational plans, effective interactions and questions with young children. They wanted the feedback, the most preferred form of feedback is form of participations by all class members and instructors. In addition to instructor's feedback, they required experience of simulated instruction in which infants and toddlers participate together.

A Method for Prediction of Quality Defects in Manufacturing Using Natural Language Processing and Machine Learning (자연어 처리 및 기계학습을 활용한 제조업 현장의 품질 불량 예측 방법론)

  • Roh, Jeong-Min;Kim, Yongsung
    • Journal of Platform Technology
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    • v.9 no.3
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    • pp.52-62
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    • 2021
  • Quality control is critical at manufacturing sites and is key to predicting the risk of quality defect before manufacturing. However, the reliability of manual quality control methods is affected by human and physical limitations because manufacturing processes vary across industries. These limitations become particularly obvious in domain areas with numerous manufacturing processes, such as the manufacture of major nuclear equipment. This study proposed a novel method for predicting the risk of quality defects by using natural language processing and machine learning. In this study, production data collected over 6 years at a factory that manufactures main equipment that is installed in nuclear power plants were used. In the preprocessing stage of text data, a mapping method was applied to the word dictionary so that domain knowledge could be appropriately reflected, and a hybrid algorithm, which combined n-gram, Term Frequency-Inverse Document Frequency, and Singular Value Decomposition, was constructed for sentence vectorization. Next, in the experiment to classify the risky processes resulting in poor quality, k-fold cross-validation was applied to categorize cases from Unigram to cumulative Trigram. Furthermore, for achieving objective experimental results, Naive Bayes and Support Vector Machine were used as classification algorithms and the maximum accuracy and F1-score of 0.7685 and 0.8641, respectively, were achieved. Thus, the proposed method is effective. The performance of the proposed method were compared and with votes of field engineers, and the results revealed that the proposed method outperformed field engineers. Thus, the method can be implemented for quality control at manufacturing sites.