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압력 자동조절이 가능한 진공밸브의 수치적 해석 및 평가
강찬혁(Chan-Heouk Kang),윤준용(Joon-Yong Yoon) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
This study was performed CFD in order to evaluate the performance of the automatically adjustable pressure vacuum control element. By using numerical analysis tools ANSYS-Fluent, to determine the torque and pressure distribution acting on the disc of the pressure valve. As a result, Verifying the stability of the valve seal plate to maintain the back pressure response and a high vacuum.
이미지 카드 활용 과학 교수-학습 방법이 초등학생의 의사소통능력에 미치는 영향
강찬혁 ( Kang Chan Hyuk ),손정우 ( Son Jeongwoo ) 경상대학교 교육연구원(구 경상대학교 중등교육연구소) 2019 현대교육연구 Vol.31 No.2
최근 교육의 흐름은 학생의 핵심역량을 향상시킬 수 있는 교육으로 변화하고 있다. 그래서 본 연구에서는 의사소통 능력 향상 학습도구를 개발하고, 그 적용 효과를 알아보고자 하였다. 이를 위해 초등학생을 위한 이미지 카드 활용 교수-학습 방법을 개발하고, 수업 전후에 의사소통능력을 검사하여 그 차이를 비교하였다. 그리고 면담을 통해 변화의 차이에 대한 이유를 알아보고자 하였다. 그 결과는 다음과 같았다. 첫째, 이미지 카드 활용 교수-학습 방법은 초등학생들의 흥미를 유발하며, 즐겁게 수업에 참여하도록 하였다. 둘째, 이미지 카드 활용 교수-학습 방법은 초등학생들의 의사소통능력 향상에 효과적이었다. 정보수집, 경청, 자기 드러내기, 주도적 의사소통, 타인관점 이해 등에서 유의미한 변화가 있었다. 그러나 짧은 기간의 수업으로 인해 고정관념 극복, 창의적 의사소통은 변화를 일으키기 어려웠다. Recently, the flow of education is changing to education that can improve students' core competencies. Therefore, in this study, we tried to develop communication tools to improve communication ability and to find out their effects. To this end, we developed a teaching-learning method using image cards for elementary school students, and compared the differences by examining communication skills before and after class. In addition, we tried to find out the reason for the difference in change through interviews. The results were as follows. First, the teaching-learning method using image cards induces interest of elementary school students and encourages them to participate in class. Second, the teaching-learning method using image cards was effective to improve the communication skills of elementary school students. Significant changes were made in information gathering, listening, self-disclosure, initiative communication, and understanding of other perspectives. However, short periods of instruction made it difficult to change stereotypes and creative communication..
기존 건축물의 내재 탄소 배출량 산출을 위한 CAD 기반 물량 자동화 추출 모델에 관한 연구
강찬혁(Kang, Chan-Hyeok),박창영(Park, Chang-Young),박성현(Park, Seong-Hyun),최창호(Choi, Chang-Ho) 한국건축친환경설비학회 2024 한국건축친환경설비학회 논문집 Vol.18 No.1
While the world has been focusing its efforts on reducing greenhouse gas emissions to address climate change, South Korea has seen the highest increase in per capita CO₂ emissions among OECD countries, necessitating a government-level response. The South Korean government has been implementing various policies to reduce greenhouse gases emitted during the construction and operation phases of buildings. These policies primarily focus on reducing energy usage in buildings and installing renewable energy sources, but research on carbon reduction technologies through resource conservation and recycling is still lacking. Nonetheless, reducing carbon emissions over the course of a building’s life cycle of buildings is becoming increasingly important, and Life Cycle Assessment (LCA) is an indispensable method for this purpose. The LCA uses the quantity of building materials used in construction, and to support this, study was conducted to develop a CAD-based automated quantity extraction model. However, this model has shown an error rate of 5-20%, failing to fully account for manual errors by workers and the complexity of construction sites. To address this issue, further research is needed to develop a more accurate prediction model for the quantity of building materials.
CFD 를 이용한 수압 분기관의 Sickle plate 형상변화에 따른 수두 손실고찰
강찬혁(kang chan hyeok) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This study include a bifurcation model with a CFD analysis according to sickle plate. we conduct an analysis of the bifurcation at sickle plate, then we improve about head loss. It used CFX-Solver for calculation of head loss in case of a generation and pumping. The sickle plate adjust radius, and then Turbulent intensity and Head loss are decreased. The proposed model is able to cut down a head loss by 0.4% when generation stete.
간접 주파수 보상을 통해 PSRR이 향상된 Low Drop Out 전압 레귤레이터
강찬혁(Chanhyuck Kang),이주열(Jooyeol Rhee) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.11
This study investigates the Power Supply Rejection Ratio (PSRR) performance of different amplifier structures under power supply noise. Simulations reveal similar PSRR at DC levels for both structures but significant differences at 3 MHz. The amplifier with indirect compensation outperformed the conventional one by approximately 40 dB at this frequency. These findings offer insights for optimizing power management ICs against high-frequency noise.
휴식과 운동 중 COVID-19 대응 보건용 마스크 착용이 호흡·심혈관계 반응 및 착용감에 미치는 영향
정재연 ( Jae-yeon Jung ),강찬혁 ( Chanhyeok Kang ),성유찬 ( Yuchan Seong ),장세혁 ( Se-hyeok Jang ),이주영 ( Joo-young Lee ) 한국의류산업학회 2020 한국의류산업학회지 Vol.22 No.6
This study explores the effects of facemasks on respiratory, thermoregulatory, cardiovascular responses during exercise on a treadmill and at rest. Five male subjects (25.8 ± 0.8 y, 171.8 ± 9.2 cm in height, 79.8 ± 28.1 kg in weight) participated in the following five experimental conditions: no mask, KF80, KF94, KF99, and N95. Inhalation resistance was ranked as KF80 < KF94 < N95 < KF99 and dead space inside a mask was ranked as KF80 = KF94 < N95 < KF99. The surface area covered by a mask was on average 1.1% of the total body surface area. The results showed no significant differences in body core temperature, oxygen consumption (VO2), carbon dioxide production (VCO2), heart rate or subjective perception among the five experimental conditions; however, cheek temperature, respiratory ventilation and blood pressure were greater for KF80 or KF94 conditions when compared to KF99 or N95 conditions (p<0.05). The differences among mask conditions are attributed to the dead space or specific designs (cup type vs pleats type) rather than the filtration level. In addition, the results suggest that improving mask design can help mitigate respiratory resistance from increased filtration.
수력학적 공동현상을 이용한 가열장치의 내부 딤플 변화에 의한 열효율 성능평가
박종진(Park, J. J),강찬혁(Kang, C. H),김현수(Kim, H. S),윤준용(Yoon, J. Y) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In this paper, thermal efficiency measurement is performed with heat generator using hydraulic cavitation about the number and location of reactor’s dimple. Heat generator consist of fixed front,rear cover and rotaing reactor. When reactor’s dimple and cover’s dimple pass each other, vapor is occurred caused by cavitation in flow field. Experiment is performed in 3 case to compare influence on cavitation and thermal efficiency of heat generator in equivalent operating condition. Comparison results show that thermal efficiency is higher that dimple is located in both each side and edge case, each side case and edge case in sequence. This means the location of dimple have more influence on generation of cavitation than number of dimple. Also the more cavitation is occurred the more thermal production is confirmed.