수소 스테이션용 가스계 소화시스템의 적용성 평가에 관한 연구

황인주(Inju Hwang),이홍철(Hongcheol Lee),정진홍(Jinhong Jung) 융복합지식학회 2020 융복합지식학회논문지 Vol.8 No.3

수소이용의 확대에 따라 수소 스테이션 등을 수용하기 위한 기준, 지침 등에 관한 기술 수요가 증가하고 있다. 이러한 기술은 주로 사회실험을 통한 완성도를 높이고, 제도적으로 기준에 반영하는 것이 중요해지고 있다. 본 연구에서는 수소 설비가 집적된 스테이션에 저충격 가스계 소화노즐을 적용할 경우에 효과성을 평가하였다. 실험평가를 위한 장치를 구성하고, S-Type과 K-type 노즐을 채택하여 공간 내에 거리에 다른 소음 정도와 주파주 특성을 비교하였다. 이를 통해 S-Type의 경우 각 경우 별 소음 감소 영향이 미미하고 소음수준도 기준을 상회함을 알 수 있었다. K-Type 노즐의 경우, 노즐 내경의 감소 비와 흐름방향 유도형상, 흡음재 등 사용을 통해 정해진 방출시간 이내, 기준치 이하의 방출 소음 성능을 충족함을 확인하여, K-Type 을 우선순위로 기준에 반영하는 방안을 모색하였다. With the expansion of hydrogen use, the demand for technology regarding standards and guidelines for acceptance of hydrogen stations, etc. is increasing. It is becoming more important to improve the degree of completion of these technologies mainly through social experiments and to reflect them in the institutional standards. In this study, the effectiveness was evaluated when applying a low-impact gas-based fire extinguishing nozzle to a station where hydrogen facilities were integrated. A device for experimental evaluation was constructed, and different noise levels and frequency characteristics were compared at distances within the space by adopting S-Type and K-type nozzles. Through this, it was found that in the case of S-Type, the effect of noise reduction in each case was insignificant and the noise level exceeded the standard. In the case of the K-Type nozzle, it was confirmed that the reduction ratio of the nozzle inner diameter, the flow direction guide shape, and the use of sound-absorbing materials satisfies the emission noise performance below the standard value within the specified emission time.

수소도시 기반시설의 수용성 확보기술

황인주(Inju Hwang),김양균(Yangkyun Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.5

COVID-19 상황에서 임상대체실습을 경험한 간호대학생의 임상수행능력에 영향을 미치는 요인

황인주(Hwang, Inju),이종란(Lee, Jonglan) 학습자중심교과교육학회 2021 학습자중심교과교육연구 Vol.21 No.18

목적 본 연구의 목적은 COVID-19 상황에서 임상대체실습을 경험한 간호대학생의 임상실습 만족도, 문제해결능력, 자기주도적 학습능력, 임상수행능력 간의 관계를 파악하고, 임상수행능력에 미치는 영향을 파악하기 위함에 있다. 방법 자료수집은 COVID-19 상황에서 임상대체실습을 경험한 경기도 소재 간호대학 4학년에 재학 중인 간호대학생 131명을 대상으로 2021년 5월 1일에서 5월 30일까지 설문조사를 실시하였다. 자료분석은 SPSS 23.0 프로그램을 이용하여 분석하였다. 결과 임상수행능력은 임상실습 만족도(r=0.446, p<.001), 문제해결능력(r=0.687, p<.001), 자기주도적 학습능력(r=0.576, p<.001)과 통계적으로 유의한 양의 상관관계를 나타냈고, 임상수행능력에 가장 영향을 미치는 요인은 문제해결능력(β=.477, p<.001)이었고, 자기주도적 학습능력(β=.190, p=.027), 임상실습 만족도(β=.187, p=.007)의 순으로 나타났고, 설명력은 50.9%이었다. 결론 본 연구결과를 바탕으로 COVID-19 상황 및 향후 포스트 COVID-19 상황에 대비한 간호대학생의 임상수행능력 향상을 위하여 임상실습 만족도, 문제해결능력, 자기주도적 학습능력을 증진시킬 수 있는 효과적인 임상실습 및 임상대체실습 교육프로그램 개발이 필요하다. Objectives The purposes of this study was to identify the relationship between clinical practice satisfaction, problem-solving ability, self-directed learning ability and clinical competency of nursing students who experience clinical alternative practice in the COVID-19 situation. And examined the influence of clinical practice satisfaction, problem-solving ability, self-directed learning ability on the clinical competence in nursing students. Methods The data collection was conducted from May 1 to May 30, 2021 on 131 forth grade nursing students in Gyeonggi-do who experienced clinical alternative practice under the COVID-19 situation. Data analysis was performed using the SPSS 23.0 program. Results Clinical competency shown statistically significant positive correlation with clinical practice satisfaction r=0.446, p<.001), problem-solving ability(r=0.687, p<.001) and self-directed learning ability(r=0.576, p<.001). The most influential factor in clinical competence was problem-solving ability(β=.477, p<.001), followed by self-directed learning ability(β=.190, p=.027) and clinical practice satisfaction(β=.187, p=.007), and the total explanation of clinical competence was 50.9%. Conclusions Based on the result of the study, it is necessary to develop effective clinical practice and clinical alternative practice education programs to enhance clinical practice satisfaction, problem-solving ability and self-directed learning ability for nursing students in preparation for the COVID-19 situation and post-COVID-19 situations.

학령전기 아동을 위한 비만예방 행동증진 프로그램의 효과: 유치원 재원생을 중심으로

황인주(Hwang, Inju),방경숙(Bang, Kyung-Sook) 한국간호과학회 2021 Journal of Korean Academy of Nursing Vol.51 No.2

Purpose: This study aimed to develop a program to promote obesity prevention behaviors for pre-schoolers and to confirm the effectiveness of the program in Korea. Methods: The program comprised 8 sessions for 4 weeks including combined classroom lectures and physical activities. A non-equivalent control group pre-post test study design was used, and seventy two children, aged 5 to 6 years (experimental group: 33, control group: 39) and their parents participated in the study. To examine the effectiveness of the program, children’s knowledge, intake of sugar-added beverages and fruits & vegetables, time of outdoor play and screen time, and parental self-efficacy were measured. Data were analyzed with SPSS/WIN ver. 22.0 and R 4.0.2, using descriptive analysis, chi-square test, Fisher’s exact test, the independent t-test, and Analysis of covariance (ANCOVA). Results: The results showed that the experimental group reported significantly increased knowledge (p < .001) and longer time of outdoor play on weekends (p = .033). However, there were no significant differences in the intake of sugar-added beverages and fruits & vegetables, screen time, and parental self-efficacy in the two groups. Conclusion: This study confirms the applicability of an obesity prevention intervention at kindergartens in Korea. The results can be used as basic data for the study of childhood obesity prevention in Korea.

남녀 중학생의 등교일과 비등교일 적정 수면시간 여부에 영향을 미치는 요인: 한국아동⋅청소년패널(2018) 이용

황인주(Hwang, inju) 학습자중심교과교육학회 2021 학습자중심교과교육연구 Vol.21 No.10

목적 본 연구는 우리나라 남녀 중학생의 등교일과 비등교일의 수면시간 현황과 적정 수면시간 여부에 영향을 미치는 요인들을 확인하기 위하여 실시되었다.방법 전국적으로 조사된 한국⋅아동청소년패널(2018년) 데이터를 이용하여 중학교 1학년에 재학 중인 2,590명을 연구대상으로 하여, 수면시간과 적정 수면시간 여부 그리고 비만도와 정서 상태에 따른 적정 수면시간 여부를 분석하였다. 자료 분석은 SPSS 23.0 프로그램을 활용하여, 실수와 백분율, 교차분석과 t-test를 이용하였고, 남녀 중학생의 적정 수면시간 여부에 영향을 미치는 요인은 다중 로지스틱 회귀분석을 실시하였다.결과 연구 결과 등교일에 남학생의 66.8%, 여학생의 49.5%가 8시간 이상 적정 수면시간을 지키고 있었다. 남학생의 적정 수면시간에 영향을 미치는 요인은 우울 점수와 공격성 점수였고, 여학생의 경우에는 삶의 만족도 점수와 비만도가 영향 요인으로 확인되었다.결론 본 연구로 남녀 중학생의 수면시간 현황과 적정 수면시간에 영향을 미치는 요인을 확인할 수 있었고, 이 결과는 초기 청소년의 건강한 수면 증진 중재 프로그램의 기초 자료로서 활용될 수 있을 것이다. Objectives This study was conducted to identify the factors affecting the current status of sleep duration and the recommended sleep duration of Korean middle school students on school days and non-school days. Methods The subjects of this study were 2,590 students enrolled in the first grade of middle school using data from the Korean Children and Youth Panel Survey (2018). For data analysis, the SPSS 23.0 Program was used, frequency and percentage, crosstab and t-test were used, and multiple logistic regression analysis was performed to determine the factors that influence whether male and female middle school students have the recommended sleep duration on school day and non-school day. Results As a result of the study, 66.8% of male students and 49.5% of female students on the day of school slept the recommended sleep duration for more than 8 hours. Depression and aggression scores were the factors influencing the recommended sleep duration of male students, and life satisfaction scores and obesity were identified as influencing factors for female students. Conclusions This study was able to confirm the factors influencing the recommended sleep duration of male and female middle school students, and the results could be used as basic data for a healthy sleep promotion intervention program for early adolescents.

주택 내 수소연료전지 전용실의 폭발 위험성에 대한 실험적 연구

박병직,김양균,황인주,Park, Byoungjik,Kim, Yangkyun,Hwang, Inju 한국안전학회 2021 한국안전학회지 Vol.36 No.4

In this study, a real-scale fuel-cell room of volume 1.36 m³ is constructed to confirm the explosion characteristics of hydrogen-air mixture gas in a hydrogen-powered house. A volume concentration of 40% is applied in the fuel-cell room as the worst-case scenario to examine the most severe accident possible, and two types of doors (made of plastic sheet and wood) are fabricated to observe their effects on the overpressure and impulse. The peak overpressure and impulse based on distance from the ignition source are experimentally observed and assessed. The maximum and minimum overpressures with a plastic-sheet door are about 20 and 6.7 kPa and those with a wooden door are about 46 and 13 kPa at distances of 1 and 5 m from the ignition source, respectively. The ranges of impulses for distances of 1-5 m from the ignition source are about 82-28 Pa·s with a plastic-sheet door and 101-28 Pa·s with a wooden door. The amount of damage to people, buildings, and property due to the peak overpressure and impulse is presented to determine the safe distance; accordingly, the safe distance to prevent harm to humans is about 5 m based on the 'injuries' class, but the structural damage was not serious.

지하 수소시설에서 수소 누출시 수소 확산특성 및 환기성능에 관한 수치적 연구

서현석(Hyeonseok Seo),황인주(Inju Hwang) 한국유체기계학회 2023 유체기계 연구개발 발표회 논문집 Vol.2023 No.7

플랜트 가용도 평가 시뮬레이터의 신뢰성 검증에 관한 연구

이홍철(Hongcheol Lee),황인주(Inju Hwang),이현동(Hyundong Lee) (사)한국CDE학회 2015 한국CDE학회 논문집 Vol.20 No.1

Recently, a number of evaluation studies on availability of plant were carried out. This study was conducted to verify of the reliability of a simulation with some variable such as configuration of process, failure probability density function and the number of iteration times for the natural gas liquefaction plant. The error rate of the KICT-RAM solution was evaluated as 0.03~1.79% compared with the result of the MAROS(commercial solution). And the error-rate change was observed in the range of 0.03~1.75 on the condition of the iteration times as 30, 100, 250. As a result the plant availability evaluation approach of KICT-RAM solution was verified as reasonable. However, the careful approach was required to use the solution because the error-rate increased according to iteration times change.

LNG 플랜트 테스트베드를 이용한 신뢰성 기반 RAM 평가기법의 적용성 검토에 관한 연구

이홍철(Hongcheol Lee),황인주(Inju Hwang) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7

In this study the applicability of RAM evaluation tool based on reliability theory was evaluated for the LNG plant test-bed. The applicability was compared with various modeling cases and failure distribution functions. The comparison results showed that the difference of RAM performance between theoretical method and commercial tool was approached in 0.93%, and also it showed that the suggested RAM evaluation method could be applied to evaluate RAM performance at the planning and basic design step.

COVID-19 상황에서 간호대학생의 심리적안녕감, 대학생활적응, 셀프리더십이 자기주도학습능력에 미치는 영향

이종란(Lee, Jonglan),황인주(Hwang, inju) 학습자중심교과교육학회 2021 학습자중심교과교육연구 Vol.21 No.22

목적 본 연구는 COVID-19 상황에서 간호대학생의 심리적안녕감, 대학생활적응, 셀프리더십, 자기주도학습능력의 현황을 파악하고, 자기주도학습능력의 영향 요인을 파악하기 위해 실시되었다. 방법 이를 위하여 경기도 소재 간호대학생 138명을 대상으로 2021년 5월에서 6월까지 구조화된 설문지를 이용하여 자료를 수집하였다. 자료분석은 SPSS/WIN 23.0 프로그램을 이용하여 실수와 백분율, 평균과 표준편차, ANOVA와 Scheff’s test, Pearson’s correlation 그리고 stepwise multiple regression을 이용하여 분석하였다. 결과 대상자의 심리적안녕감은 3.02점(4점 만점), 대학생활적응은 3.12점(5점 만점), 셀프리더십은 3.68점(5점 만점)이었으며, 자기주도학습능력은 3.61점(5점 만점)이었다. 자기주도학습능력은 대상자의 일반적 특성 중 성적(F=10.44, p<.001), 성격(F=12.31, p<.001), 간호학 전공 만족도(F=8.11, p<.001)에 따라 유의한 차이를 보였고, 심리적안녕감(r=0.649, p<.001), 대학생활적응(r=0.722, p<.001), 셀프리더십(r=0.730, p<.001)과 양의 상관관계가 있었다. 간호대학생의 자기주도학습능력에 가장큰 영향을 미친 요인은 셀프리더십(β=.420, p<.001)으로 확인되었고, 대학생활적응(β=.330, p<.001), 심리적안녕감(β=.247, p<.001), 성적(β=.093, p=.045) 순으로 영향을 미쳤다. 이러한 변수들은 대상자의 자기주도학습능력을 총 72.3% 설명해주었다. 결론 본 연구의 결과는 COVID-19 상황 및 포스트 코로나 상황에서 간호대학생의 심리적안녕감, 대학생활적응, 셀프리더십을 향상시켜 자기주도학습능력을 강화시킬 수 있는 다양한 교과과정 및 비교과프로그램 개발의 기초자료로서 활용될 수 있을 것이다. Objectives This study was conducted to understand the current status of nursing students psychological well-being, college life adaptation, self-leadership, and self-directed learning ability in the COVID-19 situation, and to identify factors affecting self-directed learning ability. Methods Data were collected from 138 nursing students located in Gyeonggi-do from May to June 2021 using a structured questionnaire. Data analysis was performed using SPSS/WIN 23.0 program using real number and percentage, mean and standard deviation, ANOVA and Scheff s test, Pearson s correlation, and stepwise multiple regression. Results The psychological well-being of the subjects was 3.02 points (out of 4 points), college life adaptation was 3.12 points (out of 5 points), self-leadership was 3.68 points (out of 5 points), and self-directed learning ability was 3.61 points (out of 5 points) It was. The self-directed learning ability was significant among the general characteristics of subjects according to grades (F=10.44, p<.001), personality (F=12.31, p<.001), and satisfaction with the nursing major (F=8.11, p<.001). positive correlation with psychological well-being (r=0.649, p<.001), college life adaptation (r=0.722, p<.001), and self-leadership (r=0.730, p<.001). there was Self-leadership (β=.420, p<.001) was identified as the factor that had the greatest influence on self-directed learning ability of nursing students, college life adaptation (β=.330, p<.001), psychological well-being (β=.247, p<.001) and grades (β=.093, p=.045) in the order of influence. These variables explained a total of 72.3% of the subjects self-directed learning ability. Conclusions The results of this study are basic data for the development of various curriculum and non-curricular programs that can enhance the self-directed learning ability by improving the psychological well-being, adaptation to college life, and self-leadership of nursing students in COVID-19 and post-corona situations.