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Myung-Kyu Lee(Myung-Kyu Lee),Seul-Hyun Park(Seul-Hyun Park) 한국화재소방학회 2022 International Journal of Fire Science and Engineer Vol.36 No.3
In this study, a series of ISO 5660-1 cone calorimetry experiments were performed to understand how the heat release rate (HRR) and CO emission are affected by the thermal thickness and charring properties of solid combustibles. To this end, HRRs and CO emissions measured from burning Douglas-fir wood (which produces a charring layer during combustion) and poly methyl methacrylate (PMMA) (which does not produce a charring layer) in the ISO 5660-1 cone calorimetry experiments were compared. Relative to PMMA, Douglas-fir wood produced a lower rate of heat release and CO emission, helping lessen human damage in fires. Results obtained from the ISO 5660-1 cone calorimetry experiments clearly demonstrate that the heat release rate varies depending on the thermal thickness and the presence of charring layer within solid combustibles. Unlike PMMA, the charring layer developed for Douglas-fir wood during combustion further increases the thermal thickness, reducing the amount of thermal decomposition and the heat released from fire. The cone calorimetry experiment results also indicate that increases in charring properties of solid combustibles were directly correlated with reductions in the HRR and increases in the CO emission.
Scheduling for an Adaptive Number of Iterations in Turbo Equalizers Combined with LDPC Decoders
Myung-Kyu Lee,Kyeongcheol Yang IEEE 2010 IEEE TRANSACTIONS ON COMMUNICATIONS Vol.58 No.10
<P>A new scheduling to reduce the complexity of a turbo equalizer (TE) combined with a low-density parity-check (LDPC) decoder is proposed. Simple metrics and criteria for the proposed scheduling are derived from its convergence behavior. The TE with the proposed scheduling monitors the status of its iterative process and determines whether additional equalization is needed or not. Based on the decision, it adjusts performing equalization and reduces the execution number of equalization. Consequently, this leads to lowering the overall complexity of the TE. Numerical results show that the proposed scheduling has lower complexity than conventional schedulings, while they have almost the same performance.</P>
An Analysis of National R&D Collaborators Network based on the NTIS Data
Myung-Seok Yang,Nam-Kyu Kang,Tae-Hyun Kim,Won-Kyun Joo,Min-Woo Park,Kwang-Nam Choi 보안공학연구지원센터 2014 International Journal of Software Engineering and Vol.8 No.11
Many researchers jointly participate in various research topics of national R&D programs, and they achieve accomplishments such as journal papers and patents as the outcome of these programs. The government administration and research administering institutes also do their part in the advancement of national science and technology by strategically distributing R&D programs to researchers, reviewing research outcomes, and setting up investment policies accordingly. Policymakers including government administrations that distribute and manage R&D finance are interested in understanding that the key players are in a given field, how the research clusters are formed, and how the research funding is distributed. Researchers are interested to look at what other researchers are doing and who their potential collaborators are This study proposes a method to provide information wanted by both policymakers and researchers. Based on the proposed method, it builds a knowledge map using the NTIS data to analyze research behavior and statistics of various research topics.
Simultaneous Detection of Insect Pathogen by multiplex PCR
Kyu-Won Kwak,Myung-Sae Han,Sung-Hee Nam,Ji-Young Choi,Seok-Hyun Lee,Hong-Geun Kim,Kwan-Ho Park 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.04
The purpose of this multiplex PCR assay is establishment and application for rapid and simultaneous detection of six pathogens related with insect diseases. Five pathogens were chosen based on the insect disease incidence rate in South Korea and specific primers of those pathogen were designed to detect insect diseases and test multiplex PCR for detecting Fungi; Beauveria bassiana(Bb), Metarhizium anisopliae(Ma), Bacteira; Bacillus thuringiensis(Bt), Pseudomonas aeruginosa(Pa), and Serratia marcescens(Sm). This research carried out the results detecting five kinds of insect pathogen of P. b. seulensis by multiplex PCR. Multiplex PCR is effective and save time to detect simultaneously these insect pathogens and multiple infections to prevent insect disease. In our study, using multiplex PCR, we demonstrated that P. b. seulensis was frequently infected with S. marcescens and co-infected with M. anisopliae in more than 80% of cases, indicating that such an analysis can be useful for pathogen identification, especially if different pathogens produce similar symptoms.
( Kyu-won Kwak ),( Myung-sae Han ),( Sung-hee Nam ),( Kwan-ho Park ),( Eun-sun Kim ),( Seokhyun Lee ),( Myung-ha Song ),( Wontae Kim ),( Ji-young Choi ) 한국잠사학회 2016 International Journal of Industrial Entomology Vol.33 No.1
Beauveria bassiana is a common fungal pathogen of Protaetia brevitarsis larvae, and although it is less common than Metarhizium anisopliae, the pathogen still poses a great risk to humans and animals that consume infected insects, owing to B. bassiana`s production of toxins like beauvericin and mycotoxin. Interestingly, the beneficial microorganism Saccharomyces cerevisiae possesses antifungal properties. In the present study, we found that S. cerevisiae inhibited the growth of B. bassiana by 97% and that S. cerevisiae failed to harm P. brevitarsis when administered via intracoelomic injection (1 × 10<sup>7</sup> cfu/mL). In addition, we also found that S. cerevisiae consumption increased the survival time of percutaneously infected P. brevitarsis larvae by 5 d and reduced the mortality of infected larvae by 12%. Therefore, S. cerevisiae is expected to be useful in the prevention and control of B. bassiana in the production of P. brevitarsis larvae.