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전사공정을 위한 UV 경화성 범프형 스탬프의 점착특성 평가
정연우(Yeon-Woo Jeong),김경식(Kyung-Shik Kim),이충우(Chung-Woo Lee),이재학(Jae-Hak Lee),김재현(Jae-Hyun Kim),김광섭(Kwang-Seop Kim) 한국트라이볼로지학회 2016 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.32 No.3
Future electronics such as electronic paper and foldable cellphone are required to be flexible and transparent and should have a high performance. In order to fabricate the flexible electronics using flexibility transfer process, techniques for transferring various devices from rigid substrate onto flexible substrate by elastomeric stamp, have been developed. Adhesion between the elastomeric stamp and various devices is crucial for successful transfer process. The adhesion can be controlled by the thickness of the stamp, separation velocity, contact load, and stamp surface treatment. In this study, we fabricated the bump shape stamp consisting of a UVcurable polymer and investigated the effects of curing condition, separation velocity, and contact load on the adhesion characteristics of bumps. The bumps with hemispherical shape were fabricated using a dispensing process, which is one of the ink-jet printing techniques. Curing conditions of the bumps were controlled by the amount of UV irradiation energy. The adhesion characteristics of bumps are evaluated by adhesion test. The results show that the pull-off forces of bumps were increased and decreased as UV irradiation energy increased. For UV irradiation energies of 300 and 500 mJ/㎠, the pull-off forces were increased as the separation velocity increased. The pull-off forces also increased with the increase of contact load. In the case of UV irradiation energy above 600 mJ/cm2, however, the pull-off forces were not changed. Therefore, we believe that the bump shape stamp can be applied to roll-based transfer process and selective transfer process as an elastomeric stamp.
정연우(Yeon-Woo Jeong),Vo Huynh Noc Bao,조성원(Seongwon Cho),정선태(Sun-Tae Cuhng) 한국지능시스템학회 2016 한국지능시스템학회논문지 Vol.26 No.5
기존 디지털 출력 방식의 PIR 센서를 이용한 침입감지 시스템은 사람이 아닌 다른 물체에 대한 침입 탐지 오류가 많았다. 본 논문은 이를 극복하기 위하여 아날로그 출력 방식의 PIR 센서 기반 침입 감지 시스템을 제안한다. 아날로그 방식 PIR 센서는 임계값을 기준으로 이진 출력값 대신, 일정 범위 내의 다양한 전압 준위로 출력값을 내보낸다. 아날로그 PIR 센서를 이용하여 획득된 신호의 샘플링된 신호값으로부터 FFT(Fast Fourier Transform) 또는 MFCC(Mel-frequency cepstrum codfficents)을 이용하여 신호의 주파수 성분을 추출하여, 인공 신경회로망(Artificial Neural Network)의 특징벡터로 사옹된다. 다양한 인간의 움직임과 애완동물의 움직임에 대한 신호 패턴들을 학습한 인공 신경회로망을 통해서 침입상황에서 침입한 객체가 사람인지 애완동물인지 판별 하게된다. The intruder detection system using digital PIR sensor has the problem that it can’t recognize human correctly. In this paper, we suggest a new intruder detection system based on analog PIR sensor to get around the drawbacks of the digital PIR sensor. The analog type PIR sensor emits the voltage output at various levels whereas the output of the digitial PIR sensor is binary. The signal captured using analog PIR sensor is sampled, and its frequency feature is extracted using FFT or MFCC. The extracted features are used for the input of neural networks. After neural network is trained using various human and pet’sn tirusion data, it is used for classifying human and pet in thine trusion situation
다단 회전식 열풍 건조기에서 커피찌꺼기의 최적 건조 조건에 관한 연구
정연우,최연석,최상규,한소영,응웬 반 꾸잉 한국폐기물자원순환학회 2020 한국폐기물자원순환학회지 Vol.37 No.7
The drying process is essential to remove the water content of waste to enhance the calorific value of the producedfuel. Even with the development and enhancement of the waste-to-heat technology highly encouraged, the current domesticdryer development capability is still insufficient not only in the design but also in the operation. Therefore, research orinvestment in the development of highly efficient dryers is required. In this study, a multi-stage rotary dryer was usedto dry coffee ground waste, which is supplied at a rate of 110kg/ hr. Various operation parameters were tested such asdrum speed, recirculation rate of exhaust gas, and temperature of exhaust gas. Results suggest that a drum speed of 0.4rpm, an exhaust gas recirculation rate of 73%, and an exhaust gas temperature of 128oC were the optimum conditionsto minimize the water content in coffee ground waste.
택지개발이 인접한 읍면동에 미치는 영향 : 경기 · 인천 지역을 대상으로
정연우(Jeong, Yeon Woo),우명제(Woo, Myungje) 한국지역개발학회 2020 한국지역개발학회 학술대회 Vol.2020 No.10
Cities grow through a series of processes that lead from a single structure to a multi-nuclear structure, and naturally become Metropolis because of their communion with neighboring cities. However, Residential Development Project are difficult to naturally link functionality among surrounding cities that occur during the process of general urban growth that is artificially created in urban suburbs. Therefore, the impact of Residential Development on the rate of change in population and number of workers in Gyeonggi-do and Incheon Metropolitan City between 2015 and 2005 was analyzed in detail and the following results were derived. First, it was found that only the area of residential development zones had a significant value in terms of impact on population changes. Second, it was analyzed that the area and number of residential development zones had significant values as the impact on the change in the number of workers, and that it had significant values with the presence or absence of residential development zones.
정연우 ( Yeon Woo Jung ),윤세원 ( Se Won Yoon ),두영택 ( Young Taek Doo ) 대한물리의학회 2010 대한물리의학회지 Vol.5 No.3
연구목적:수심 깊이에 따른 수중운동이 하지근력에 미치는 영향을 알아보고자 하는데 목적이 있다. 연구방법:신경근골격계 질환이 없는 여자 10명을 대상으로 하였고, 무작위로 수심 0.7m 그룹과 1.4m 그룹으 로 배치하였다. 수중운동은 1회 40분, 주 3회 6주 동안 적용하였다. Ultrasound MyLab25(Esaote, Italy)를 이용 하여 하지근육의 우모각과 밀도를 실험전과 후에 측정하였다. 연구결과:골격근 구조의 역학적 특성을 나타내는 우모각 변화를 비교한 결과 0.7m 그룹의 오른쪽 넙다리곧 은근과 왼쪽 넙다리곧은근, 앞정강근 그리고 장딴지근에서, 1.4m 그룹의 오른쪽 앞정강근과 장딴지근, 왼쪽 넙 다리곧은근에서 통계학적으로 유의한 차이가 나타났으나(p<.05), 수심 깊이에 따른 유의한 차이는 없었다 (p>.05). 또한, 질적 특성을 나타내는 근육 영상 밀도 변화를 비교한 결과 0.7m 그룹의 오른쪽 넙다리곧은근, 장딴지근과 왼쪽 넙다리곧은근, 앞정강근, 장딴지근에서 1.4m 그룹의 양쪽 넙다리곧은근, 앞정강근, 장딴지근에 서 통계학적으로 유의한 차이가 나타났고(p<.05), 특히 1.4m 그룹에서 현저한 증가를 보였으나 수심 깊이에 따 른 유의한 차이는 없었다(p>.05). 결론:본 연구에서는 수심 차이에 관계없이 수중운동 후 근밀도와 우모각에 영향을 미치는 것을 확인할 수 있 었다.