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Effect of foaming processes on the reduction of warpage in glass fiber reinforced plastic composites
조수현,김현근,손주성,유영재,차성운 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.9
In the injection molding process, dimensional stability of the product is an important factor. Because reinforced plastic composites show shrinkage and warpage that are different from non-reinforced plastics, it is necessary to compensate for these differences. In this study, two foaming methods, microcellular foaming injection molding and chemical foaming injection molding, were applied to achieve dimensional stability in the molding process of glass fiber reinforced plastic (GFRP) composites. Both microcellular foaming and chemical foaming showed a warpage reduction effect. Therefore, if a selective foaming process is applied to achieve weight reduction and necessary material properties, microcellular foaming and chemical foaming can be used to achieve dimensional stability in reinforced plastic composite materials.
건조숙성 조건이 한우 설도육의 건조수율, 미생물 성장 및 저장성에 미치는 영향
조수현,강선문,김윤석,Hoa Van Ba,김영춘,김진형,박범영,안달래,이은미,성필남 강원대학교 동물자원공동연구소 2018 동물자원연구 Vol.29 No.3
The objective of this study was to investigate changes in drying yield, pH, water activity, microbial growth, and storage stability of bottom rounds of Hanwoo beef under four different dry-aging treatments (T1–T4) as temperature (2~4℃), relative humidity (65~86%) and dry-aging period (20~90 d). The drying yield decreased by 83.13–97.05% as the drying period increased. Among the four treatments, there were no significant differences in drying yield after 60 d of dry-aging. The total plate aerobic counts (TPC) increased by 1.07–4.39 log colony-forming units (CFU)/g as the dry-aging period increased. Of the four treatments, T4 at 40, 60, and 90 d had significantly higher TPCs than those observed for the other treatments on the same days (p<0.05). As the period of dry-aging increased, pH values increased by 5.35– 5.88 for knuckle and 5.34–5.62 for sirloin muscle, and water activity values decreased. For knuckle and sirloin muscle, the water activity values at 40 d and 60 d of T1 and T4 were significantly higher than those of the other treatments on the same days (p<0.05). The thiobarbituric reactive substances and volatile basic nitrogen values of the aged products increased as the dry-aging period increased. The results of this study showed that dry-aging conditions such as those in the T2 or T3 treatments (with a gradual increase in temperature and humidity) for less than 60 d would be best for yield, reduction of microbial growth and storage stability by dry the muscle surface quickly at the beginning period. Further research should include meat quality and economic analysis for these conditions that examines the benefits of these dry-aged products for the end processor.
後続母音の長短による日本語摩擦音の音声的な長さの実現 ― 遅延反復課題を用いた生成実験と聴覚的評定に基づいて ―
조수현 한국일본어교육학회 2019 日本語敎育 Vol.0 No.88
The purpose of this study is to investigate how Korean learners control the length of Japanese fricatives and long and short vowels following the fricatives. This Experiment was conducted using a reading paradigm and the delay repetition technique with 36 meaningful words. 40 students learning Japanese pronounced these words using two different methods and were judged for the naturalness in terms of length. The results revealed that there was a strong effect of two production methods on the voicing and length of fricatives. The factors that significantly affect the naturalness of the length of the fricatives were voicing of the fricatives, the length of the following vowel, the correctness of the single sound of fricatives, and two different methods. Depending on different stimuli such as visual and auditory, learners were influenced by the voicing of the fricative. In the reading paradigm, the voiced fricative [ʑ] preceding a short vowel /o/ and the voiced fricative [ʑ] preceding a long vowel /oo/ were rated highly unnatural. On the other hand, the unvoiced fricative[s], [ɕ] preceding a long vowel /oo/ at the end of the word increased the difficulty in producing the correct length in the delayed repetition technique. In conclusion, this study offers the factors of timing control for the length of fricatives and also can contribute to the improvement of Japanese language education.
Rate Adaptation with Q-Learning in CSMA/CA Wireless Networks
조수현 한국정보처리학회 2020 Journal of information processing systems Vol.16 No.5
In this study, we propose a reinforcement learning agent to control the data transmission rates of nodes in carriersensing multiple access with collision avoidance (CSMA/CA)-based wireless networks. We design areinforcement learning (RL) agent, based on Q-learning. The agent learns the environment using the timeoutevents of packets, which are locally available in data sending nodes. The agent selects actions to control thedata transmission rates of nodes that adjust the modulation and coding scheme (MCS) levels of the data packetsto utilize the available bandwidth in dynamically changing channel conditions effectively. We use the ns3-gymframework to simulate RL and investigate the effects of the parameters of Q-learning on the performance ofthe RL agent. The simulation results indicate that the proposed RL agent adequately adjusts the MCS levelsaccording to the changes in the network, and achieves a high throughput comparable to those of the existingdata transmission rate adaptation schemes such as Minstrel.
부ㆍ모애착이 초등학생의 학교생활적응에 미치는 영향 - 자아탄력성의 매개효과 -
조수현,이숙 한국부모놀이치료학회 2013 한국부모놀이치료학회지 Vol.- No.4
인간은 일생을 살아가면서 끊임없이 새로운 환경에 적응하며 살아가야 한다. 사회의 변화에 따라 자기의 욕구를 어떻게 조정해 나가느냐 하는 적응의 문제는 현대를 살아 가고 있는 누구에게나 중요한 문제이다. 특히 초기 아동기부터 청소년기에 이르기까지 많은 시간을 보내는 학교생활에서의 적응은 중요한 개인 발달 과제 중 하나로 볼 수 있다(Rutter, 1985). 학교는 가정으로부터 벗어나 사회의 일원이 되기 위한 사회화 훈련을 시작하는 곳 으로 공동체 생활을 통해서 단체 생활의 규칙을 익히고 바람직한 자아개념과 사회관, 가치관을 형성하게 되며 새로운 환경 속에서 조화롭게 잘 적응할 수 있는 힘을 길러 나갈 수 있도록 해준다(백정빈, 2008; 유병선, 2008). 특히 아동에서 청소년 전기로 접 어들게 되는 초등학교 고학년시기에는 학교생활을 통해 본격적으로 사회생활에 필요 한 대처기술을 배우게 되고 새로운 환경에서의 적응력을 키워나가기 때문에 이 시기 의 안정된 학교생활적응은 성인이 되어서까지 영향을 준다.