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윤신용(Yoon Shin-Yong),최근수(Choi Geun-Soo),백수현(Baek Soo-Hyun),김용(Kim Yong) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.10
본 논문에서는 FEM(Finite Element Method)을 이용한 산업용 압전 잉크셋 프린트헤드의 특성을 해석하였고 이로부터 압전헤드를 설계, 제작하였다. 이를 위해 압전세라믹의 물질특성과 잉크특성을 고려한 밴딩모드 방식의 구동과 관계이론을 기술하였다. 압전방정식은 압전 구조에 의한 공진주파수로부터 압전 파라미터를 구할 수 있고 실험을 통하여 이러한 헤드특성을 얻을 수 있었다. 압전 프린트헤드의 해석 및 설계에 대한 적합성을 확인하였다. 이러한 결과 128노즐의 압전 영크셋 프린트헤드와 제어회로를 제작하여 적합한 제팅 특성을 얻을 수 있었다. 응용 제품은 기존 13단계의 복잡공정으로 제작된 PCB 제작공정을 잉크셋 프린팅 기술에 의해 3단계로 간소화 할 수 있는 에칭 PCB 패턴회로제작에 적용하였다.
임상간호사의 근거기반실무 신념과 연구 관련 행동의도에 따른 온 요법 간호
윤수경(Yoon, Sukyung),신용순(Shin, Yong Soon) 기본간호학회 2016 기본간호학회지 Vol.23 No.3
Purpose: This study was done to compare heat applications by nurses in accordance to belief in evidence-based practice and behavior intention related to research. Methods: A cross-section survey design was used. Participants were 228 nurses from 5 institutions who completed the research questionnaire. Data were collected during July and August 2015. Results: The nurses reported that duration of heat applications was 2.5 minutes to 90 minutes. Frequently used heat application devices, in order of frequency, were rubber bag, gel pack and red clay pack. Most of the nurses (78%) responded that advice from colleagues was the most frequently used basic evidence for heat application. There was a statistically significant difference for the necessity of heat application practice guidelines between the high evidence-based practice belief cluster and the low cluster (χ²=15.39, p<.001). Conclusion: There were difficulties in providing consistent nursing interventions because of practical differences and absence of evidence-based guidelines for heat application. The researchers recommend that basic studies with various instruments be conducted and proper practice guidelines developed for heat application.
하구언 담수방류와 영산강 하구 식물플랑크톤 생체량 및 환경인자의 장기변동
윤보배 ( Bo Bae Yoon ),이어진 ( Eo Jin Lee ),강태안 ( Tae Ahn Kang ),신용식 ( Yong Sik Shin ) 한국하천호수학회 2013 생태와 환경 Vol.46 No.2
In Yeongsan River estuary, located in the southern West Coast, a dike was constructed in December 1981. After the construction of a dike, discharge mechanism of fresh water has been changed, the water quality and chlorophyll-a are expected to be influenced by fresh water discharge. We investigated temporal and spatial variations and long-term trend of phytoplankton biomass (chlorophyll-a) and environmental factors. The concentrations of nutrient and chlorophyll-a were generally high in summer and the concentrations were increased toward downstream. Surface/bottom salinity difference was negatively correlated with salinity in surface water but positively with nutrient and chlorophyll-a. TN, TP and DIN concentrations were generally increased over 10 years. This study can provide information for better management of water quality for Youngsan River estuary.
신용창(Yong Chang Shin),윤헌준(Heonjun Yoon),윤병동(Byeng D. Youn) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Metamaterial-based energy harvesting (MBEH) has been recently proposed as a breakthrough technology to drastically enhance energy conversion efficiency. The bandgap, one of the property of the metamaterial can be used to focus mechanical wave on energy conversion device for highly dense energy harvesting. Even though many investigations of the MBEH have been reported, however, only a few research has considered the wave cancellation in the metamaterial design. In this study, therefore, we propose a new phononic crystal design configured with quarter-wave stack (QWS) unitcells to avoid wave cancellation. In the modeling thrust, the multiphysics finite element models are developed to analyze dispersion and electroelastic transduction of the energy conversion device. To verify the proposed QWS design, we build a beamlike shape phononic crystal and investigate the energy harvesting performance when constructive and destructive interferences occur. Finally, the energy harvesting performance of the proposed design is compared with non-QWS design which have the same impedance and the bandgap at the target frequency.