불순물을 포함한 이산화탄소의 증발 열전달계수 압력강하 상관식 비교

정주희(Ju Hee Jeong),윤린(Rin Yun) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.4

The evaporating heat transfer characteristics and the pressure drop of carbon dioxide, including impurities, were experimentally measured and compared with the predictions from existing models. The experimental setup consisted of a test section, a condenser, and a heating part. The test section used double-tube type, and the copper tube of 1/2 inch was located inside the PVC pipe. Total length of the test section was 4 meters. The temperature of carbon dioxide was measured by attaching the thermocouple to the test part using soldering. In addition, the temperature of the brine was measured by inserting the T-type thermocouple through the hole in the outer tube in order to measure the brine temperature in the PVC tube. The CO₂ mixture after the test section was condensed by using two plate-type heat exchangers. The impurity of nitrogen concentration was transformed by 1.0~5.0 wt.% under 400~500 kg․m<SUP>-2</SUP>s<SUP>-1</SUP> conditions. The heat transfer coefficients of pure CO₂ and CO₂+N₂ were compared by using the Shrock and Grossman model, the Gungor and Winterton model, and the Yoon et al.’s model. The pressure drops were compared using the Müller-Steinhagen model, the Heck and Chislom models, and the Yoon et al.’s model. The Yoon et al.’s model and the Chislom model showed the best performance when predicting the boiling heat transfer coefficient and pressure drop for the CO₂+N₂ mixture, respectively.

수치모델링으로 구축된 바람지도를 이용한 한반도 풍력자원평가

정주희(Jeong, Ju-Hee),김유근(Kim, Yoo-Keun),권지혜(Kwun, Ji-Hye) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06

군집분석과 상세기상모델을 통한 포항지역 계절별 바람장 특성

정주희 ( Ju Hee Jeong ),오인보 ( In Bo Oh ),고대권 ( Dae Kwun Ko ),김유근 ( Yoo Keun Kim ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.6

The typical characteristics of seasonal winds were studied around the Pohang using two-stage (average linkage then k-means) clustering technique based on u- and v-component wind at 850 hpa from 2004 to 2006 (obtained the Pohang station) and a high-resolution (0.5 km grid for the finest domain) WRF-UCM model along with an up-to-date detailed land use data during the most predominant pattern in each season. The clustering analysis identified statistically distinct wind patterns (7, 4, 5, and 3 clusters) representing each spring, summer, fall, and winter. During the spring, the prevailed pattern (80 days) showed weak upper northwesterly flow and late sea-breeze. Especially at night, land-breeze developed along the shoreline was converged around Yeongil Bay. The representative pattern (92 days) in summer was weak upper southerly flow and intensified sea-breeze combined with sea surface wind. In addition, convergence zone between the large scale background flow and well-developed land-breeze was transported around inland (industrial and residential areas). The predominant wind distribution (94 days) in fall was similar to that of spring showing weak upper-level flow and distinct sea-land breeze circulation. On the other hand, the wind pattern (117 days) of high frequency in winter showed upper northwesterly and surface westerly flows, which was no change in daily wind direction.

기능적 인지기반중재가 급성 뇌졸중 클라이언트의 작업수행에 미치는 영향: 증례보고

정주희 ( Jeong Ju-hee ) 대한인지재활학회 2021 대한인지재활학회지 Vol.10 No.1

목적: 이 증례보고의 목적은 기능적 인지기반중재(functional cognitive-based intervention)가 급성 뇌졸중 환자의 작업수행 및 인지기능에 미치는 영향을 알아보고자 하였다. 연구방법: 2018년 2개월 동안 종합병원에서 작업치료를 받은 전자의무기록의 후향적 차트 리뷰를 통해 49세 뇌졸중 클라이언트 1명의 기록이 수집되었다. 가정환경을 모의하도록 디자인된 병원 환경에서 총 2개월 동안 하루에 한 번 30분씩 기능적 인지기반의 작업 중재 회기에 참가하였다. 중재 전·후로 중재 효과를 확인하기 위하여 한국판간이정신상태판별검사(MMSE-K), 언어유창성검사(LFT), 전산화신경인지기능검사(CNT)를 통해 언어·인지기능을 평가하였고, 수행기반평가인 운동처리기술평가(AMPS), 사회적상호작용기술평가(ESI), 알렌인지수준판별검사(ACLS)를 통해 기능적 인지능력을 평가하였다. 그리고 캐나다작업수행측정(COPM)을 통해 목표한 우선순위의 작업 수행도를 평가하였다. 결과: 기능적 인지기반중재 이후 특정 언어·인지기능의 측정 결과인 언어유창성(LFT)과 인지능력(MMSE-K와 CNT)의 향상을 보였고, 수행기반평가 결과인 작업수행과 의사소통의 질(AMPS와 ESI), 작업 수행도(COPM), 문제해결 및 학습수준(ACLS)에서 모두 향상을 보였다. 결론: 본 증례보고는 아급성기 케어부터 언어·인지능력의 결손이 있는 뇌졸중 클라이언트에게 의미 있는 일상생활 맥락을 최적으로 모의한 의료 임상 환경에서 인지능력을 안전하고 효율적으로 사용하도록 하는 기능적 인지기반중재를 제공하고, 일상생활 능력과 더불어 인지기능의 향상에 효과가 있다는 임상적 근거를 제공하는데 의의가 있다. Objective: The purpose of this case report was to investigate the effect of functional cognition based intervention on occupational performance and cognitive function in acute stroke patients. Methods: Records of one 49-year-old stroke female client were collected through a retrospective chart review of electronic medical records who received occupational therapy at a general hospital for 2 months in 2018. She participated in a functional cognition-based intervention session for 30 minutes once a day for a total of 2 months in a hospital environment designed to simulate a home environment. Before and after the intervention, cognitive linguistic function was assessed through Korean version of Mini Mental State Examination (MMSE-K), Lexical Fluency Test (LFT), and Computerized Neurocognitive Function Test (CNT), and functional cognition was assessed through performance-based test (PBT) such as Assessment of Motor and Process Skills (AMPS), Evaluation of Social Interaction Skills (ESI), and Allen Cognitive Level Screen (ACLS). And the targeted priority occupational performance was assessed through Canadian Occupational Performance Measure (COPM). Result: After the functional cognition-based intervention, cognitive linguistic function (MMSE-K, LFT, CNT) improved, and the PBT result of quality of occupational performance and social interaction skills(AMPS and ESI), occupational performance (COPM)and problem solving and learning level (ACLS) all showed improvement. Conclusion: This case report suggests that the functional cognition-based interventions to safely and efficiently utilize cognitive skills in meaningful daily life contexts to stroke clients with cognitive and linguistic problems from acute care can improve cognitive linguistic function as well as daily living ability.

연구논문 : 수도권 대기질 모델링 정확도 향상을 위한 WRF모델링: 계절별 물리옵션 민감도 연구

정주희 ( Ju Hee Jeong ),오인보 ( In Bo Oh ),강윤희 ( Yoon Hee Kang ),방진희 ( Jin Hee Bang ),안혜연 ( Hye Yeon An ),석현배 ( Hyeon Bae Seok ),김유근 ( Yoo Keun Kim ),홍지형 ( Ji Hyung Hong ),김지영 ( Ji Young Kim ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.1

In order to improve the prediction of the regional air quality modeling in the Seoul metropolitan area, a sensitivity analysis using two PBL and microphysics (MP) options of the WRF model was performed during four seasons. The results from four sets of the simulation experiments (EXPs) showed that meteorological variables (especially wind field) were highly sensitive to the choice of PBL options (YSU or MYJ) and no significant differences were found depending on MP options (WDM6 or Morrison) regardless of specific time periods, i.e. day and night, during four seasons. Consequently, the EXPs being composed of YSU PBL option were identified to produce better results for meteorological elements (especially wind field) regardless of seasons. On the other hand, the accuracy of all simulations for summer and winter was somewhat lower than those for spring and autumn and the effect according to physics options was highly volatile by geographical characteristics of the observation site.

질소 포함 이산화탄소의 증발열전달 특성 연구

정주희(Ju Hee Jeong),윤린(Rin Yun) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.1

The characteristics of boiling heat transfer were experimentally investigated for carbon dioxide with nitrogen impurities. The experimental setup was composed of a test section, a condensation section for the liquefaction of carbon dioxide before entering the pump, and a heating section for controlling the temperature of the entrance of the test unit. The test section was comprised of a double tube heat exchanger. A copper tube with a length of 4 m and a 1/2-inch diameter was located inside and the PVC pipe used for heating was outside. T-type thermocouples were installed in the annulus space of the test section to measure the brine temperature in the PVC and the surfaces of the copper tube. The experiment was performed under a mass flux of 200~700 kg·m<SUP>-2</SUP>s<SUP>-1</SUP> at a nitrogen concentration of 1.0~5.0 mol% and 0.1~0.9 of vapor quality. The boiling heat transfer coefficient of carbon dioxide with impurities decreased by an average of 14.7% compared to pure carbon dioxide.

수도권지역 대기질 예측을 위한 기상장 모델의 바람장과 온도장 비교 연구

정주희(Ju-Hee Jeong),김유근(Yoo-Keun Kim),문윤섭(Yun-Seob Moon),황미경(Mi-Kyoung Hwang) 한국대기환경학회 2007 한국대기환경학회지 Vol.23 No.6

연구논문 : 고층기상관측자료를 이용한 바람장 개선 효과 연구

정주희 ( Ju Hee Jeong ),권지혜 ( Ji Hye Kwun ),김유근 ( Yoo Keun Kim ) 한국환경과학회 2007 한국환경과학회지 Vol.16 No.10

R-1234ze(E) 냉매적용 유하액막식 증발열전달에 관한 기초연구

정주희(Ju Hee Jeong),이종훈(Jong Hoon Lee),이공훈(Kong Hoon Lee),김동호(Dong Ho Kim) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6

본 연구는 R-1234ze(E)를 냉매로 사용하는 유하액막식 증발기의 증발 열전달계수를 실험적으로 측정 및 분석하는 것으로, Low GWP 냉매를 활용한 냉동기 설비에 대한 기초자료를 확보하는 것을 목적으로 한다. 실험 장치는 증발 열전달계수를 측정하기 위한 증발부, 냉매의 응축을 위한 응축부로 구성되어있다. 시험부는 In-line으로 4열의 전열관이 위치하며, 각 전열관 입·출구에 냉수의 온도를 측정하여 전열관의 성능을 평가하였다. 실험은 포화온도 3.5℃, 10℃, 열유속 10 - 60 kW/m2·K의 조건에서 수행되었다. 실험결과 200 이상의 Film Reynolds조건에서는 모든 전열관이 일정한 열전달 계수값을 보였으며, 그 이하의 경우 냉매의 증발로 인하여 드라이아웃이 발생하여열전달 계수값이 급격하게 감소하였다. 또한 포화온도가 증가함에 따라 열유속에 따른 평균 열전달 계수는 약 11% 증가하였다.

중소기업의 혁신활동에 있어 정보원천이 혁신성과에 미치는 영향요인 : 혁신협력활동의 매개효과를 중심으로

정주희(Jeong Ju Hee),나주몽(Na Ju Mong) 한국경제통상학회 2020 경제연구 Vol.38 No.1

본 연구는 제조업의 혁신성과 창출을 위해 혁신활동에 있어 중소기업의 혁신성과에 정보원천의 영향요인을 살펴보고 혁신협력활동에 매개효과를 고찰하였다. 그 결과, 민간서비스업체와 대학 및 고등교육기관에 대해 협력여부가 매개효과를 나타낸 것으로 확인되었다. 특히 민간서비스업체와 대학 및 고등교육기관의 매개효과는 공정혁신과 제품혁신에 있어 상반되는 결과를 나타냈다. 이는 제조 중소기업의 경우에 제품혁신과 공정혁신활동에 있어 대학 및 고등교육기관과 민간서비스를 통한 정보에 대한 혁신협력활동이 유효하다는 것을 보여주는 것으로 중소기업의 혁신활동에서 민간서비스업체와 대학 등의 역할의 중요성을 확인할 수 있었다. This study examined the influence factors of information sources on the innovation performance of SMEs in innovation activities and examined the mediating effect on innovation collaboration activities. As a result, it was confirmed that collaboration between private service companies and higher education institutions had a mediating effect. In particular, the mediating effects of private service companies, universities and higher education institutions are opposite in process innovation and product innovation. This shows that in the case of manufacturing SMEs, innovation collaboration on information through higher education institutions and private service companies is effective in product innovation and fair innovation activities. Therefore, it was confirmed that the role of private service companies and higher education institutions in SMEs innovation activities is important.