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Analysis of compassionate care experience among clinical nurses using grounded theory
Hwa Soon Kim,Eun Ha Roh,Kyungsun Moon,Jihee Kim,Youngjin Lee,Hwa Soon Kim,Eun Ha Roh,Kyungsun Moon,Jihee Kim,Youngjin Lee 한국간호과학회 2021 한국간호과학회 학술대회 Vol.2021 No.10
Aim: The aim of this study was to explore the meaning of the experience of providing compassionate care to patients admitted to acute hospitals. Method: This study design was qualitative research that applies the evidence theory method. The participants were clinical nurses who experienced direct patient care for more than three months (N=13). The data collection was an in-depth face-to-face interview from July 2020 to February 2021. The number of interviews per participant was one time, and the interview time was 30-60 minutes, which was recorded after obtaining informed consent, and the researcher immediately transcribed and analyzed after the interview. The data analysis was used the Strauss and Corbin (2008) method. Result: The compassionate care experience of clinical nurses was derived from 78 concepts, 33 subcategories and 16 categories. The central phenomenon representing compassionate care among clinical nurses was derived from ‘holistic care that understands disease progression’. The causal conditions of this process were shown to be "immersion into the patient’s difficult feelings" and ‘sensitive awareness of the patient’s physical and emotional needs". Contextual conditions affecting the phenomenon were ‘experience a patient’s emotional vortex’, ‘workload pressure and time limits’, ‘lack of warmth and tolerance of the nurse’ and intervening conditions were "advice from colleagues’, "training through experience and learning". The interaction strategies were "recognizing emotions", "trying to communicate", priority pain control", "stay by your side by side’, and "to provide information, and the results were "positive changes in the patients", "the satisfaction and belief of a nurses", and "be burned out". Conclusion: Based on the results of this study, the ultimate consequence of compassionate care was enhancing job satisfaction and professional beliefs from the nurse"s perspective and leading to patient cooperation and positive health outcomes from the patient"s perspective. It is expected that such nurses will be utilized as the cornerstone for developing the body of knowledge related to compassion-based care.
Current Feedback with Decoupling Scheme for Single-Phase UPS Using a Single Current Sensor
Youngjin Lee,Younghoon Cho,Jung-Muk Choe,Gyu-Ha Choe 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper proposes an inductor current feedback plus load current decoupling scheme for single-phase uninterruptible power supply (UPS) applications using a single current sensor. At first, the inductor current feedback with and without load current decoupling are compared in the view point of the output voltage control performance. The output impedance of the entire control system is analytically compared by using the derived model. From this analysis, it is shown that using the load current decoupling is better than not using the load current decoupling in voltage regulation performance. In addition to this analysis, a current sensing technique is proposed to measure the inductor and load current with a single current sensor. The proposed sensing method is shown that a load current and a branch current are simultaneously sampled by using a single current sensor at both the peak and valley point of the pulse-width modulation (PWM) carriers regularly, and then the inductor current and load current are reconstructed with the proposed algorithm in a single PWM cycle. Accordingly, the number of sensor and potential current sensing error can be reduced.
분자동역학을 이용한 나노 채널에서 표면 젖음 특성과 두 평판의 온도 차에 따른 응축 거동에 대한 연구
김영진(Youngjin Kim),하만영(Man Yeong Ha) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Molecular dynamics simulation has been conducted to investigate the condensation characteristics in nano-scale confinement. The condensate rate according to the surface energy and temperature difference between hot side plate and cold side plate is investigated. When the surface energy increases, the condensate rate increases. However, at the surface energy is low(β=0.1), the condensation hardly occurs because of weak solid-liquid interaction. When the temperature of cold side plate decreases and the temperature of hot side plate is fixed, the condensate rate and quantity of condensation increase. However, when the temperature of hot side plate increases and the temperature of cold side plate is fixed, it does not affect condensate rate although the temperature difference increase. In this paper, we used Inhouse code to simulate condensation phenomena and validated the results by comparing them with the precedent research.
송영진(Youngjin Song),김준호(Joonho Kim),류규현(Gyuhyeon Ryu),하희운(Huiun Ha),박성태(Sungtae Park),김태우(Taewoo Kim),김한울(Hanul Kim) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
전 세계적으로 이산화탄소 배출로 인한 기후변화 문제가 심각해짐에 따라 수소를 기반으로 한 경제체계를 의미하는 수소경제로 에너지 패러다임이 전환되고 있다. 정부에서도[재생에너지 3020 이행계획(안)]을 발표하며 에너지 전환을 위해 태양광, 풍력 등 재생에너지원의 보급을 확대하고 있다. 더불어 2019년 [수소경제 활성화 로드맵]을 발표하며 단계적으로 2040년까지 년 간 526만 톤의 수소생산을 목표로 하고 있다. 재생에너지원 확대에 따라 발전량의 증가로 기저부하를 담당하고 있는 원자력 발전의 출력감소로 잉여전력이 발생할 수 있다. 이에 대한 대안으로 친환경 수소를 생산, 저장하여 필요 시 재사용하는 방법이 대두되고 있다. 이는 정부가 추진하고 있는 수소경제 활성화 정책인 대량수소 공급을 해결할 수 있는 방안이 될 수 있다. 현재 고려할 수 있는 원자력을 활용한 친환경 수소생산방법은 원자력발전소의 종류(PWR, VHTR, SMR 등), 수소생산 기술(저온/고온 수전해, 황-요오드 열화학 물 분해, 열화학 고온전기분해), 수소생산을 위한 에너지지원(전기, 열)에 따라 구분할 수 있다. 국내에서 생산된 원자력에너지의 전력단가는 재생에너지원과 비교하여 상대적으로 저가이므로(원자력 68.3원/kWh, 태양광 78원/kWh, 풍력 79.4원/kWh 전력통계정보시스템 21.6월 기준, REC 적용 시 재생에너지 전력가격 상승 예상) 저렴한 수소생산이 가능하다. 원자력발전은 날씨에 대한 영향이 없으므로 출력변동 없는 높은 이용률로 전력생산이 가능하므로 수전해 설비에 안정적으로 전력을 공급하여 큰 무리 없이 안정적인 수소생산이 가능하다. 하지만, 대규모 수소생산을 위해서는 저온 수전해 설비의 대량화, 실증수준의 고온 수전해설비의 기술력 제고, 기존 원자력 인프라를 활용하기 위한 인허가 제도 개발, 설계시점부터 수전해 시스템과 연계한 신형 소영원자로(SMR) 개발과 연계한 연구가 필요하다. 수소에너지 활용기술의 중요성이 고조되고 있는 시점에 원자력을 활용한 대량수소 생산을 원자력에너지가 재생에너지와 상생할 수 있는 가능성을 보여준다.
분자-연속체 하이브리드 기법을 이용한 구조물이 있는 나노 채널에서의 Couette 유동에 대한 수치적 연구
김영진(Youngjin Kim),정명근(Myunggeun Jeong),하만영(Man Yeong Ha) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Molecular-continuum hybrid method is developed for simulation micro-and nano-scale fluid where continuum fluidics cannot predict. Molecular dynamics simulation is used near the solid surface which connot be predicted by continuum fluidics and Navior-Stokes equation is used in other regions. We carried out molecular-continuum hybrid method to investigate effect of solid-liquid interaction and effect of roughness in a nano channel. We find that the surface energy such as solid-liquid interaction influence on boundary condition and the surface nanostructures have a effect on friction of the liquid nanoflow.