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Risk-informed Emergency Response Training for Backdraft in Nuclear Power Plants
Mihyun Kim,Wonkook Kim,Hongki Kim,Jungman Kim,Sunhong Yoon,Jangwon Choi,Heemoon Kim 한국화재소방학회 2023 International Journal of Fire Science and Engineer Vol.37 No.3
Research has been conducted for developing fire evacuation and response training programs for nuclear power plant (NPP) application. Among numerous fire scenarios that may occur in an NPP environment, three different points of origin for a fire were selected for the program based on a risk-informed approach: switchgear room, main control room, and safety injection pump room. Fire outcomes were predicted for these scenarios via numerical modeling and the results were incorporated into the newly developed fire evacuation and response training program for the APR1400, Korea’s next-generation NPP model. The switchgear room fire scenario was found to have the most potential for backdraft to occur during manual fire response following automatic gaseous fire suppression system activation. The emergency response manual does discuss this possible backdraft occurrence; however, the guidance to avoid injuries is qualitative, such as to be cautious of backdrafts and wait a sufficient amount of time after opening a door before entering the. In this study, backdraft phenomenon that may occur from a switchgear room fire was numerically examined using the recent version of the Fire Dynamics Simulator to develop an appropriate timeline to be implemented in the fire evacuation and response training program. Based on the findings, the following guidance is provided: (1) backdraft can only occur when the fire originates in the space near the door; (2) wait at least 10 minutes after opening the door before entering the room; (3) watch for rapid smoke production, as this may be an antecedent phenomenon of backdraft; and (4) when smoke production increases rapidly, leave the room as soon as possible to avoid being caught within the deflagrating flames from a backdraft.
Young Hyun Kim,Heemoon Kim,김형진 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.4
A push–pull conjugated dye with a dicyanomethylene-1,4-dihydropyridine moiety (DCMP) was designed and synthesized for use as an optical pH sensor in acidic solution. The spectroscopic and pH-sensing properties of DCMP were investigated by UV–vis and fluorescence spectroscopy. DCMP displayed a pH-dependent ratiometric absorption property in the range of pH 4.5–12.0. The fluorescence intensity of DCMP around 560 nm, when irradiated at 435 nm, increased when pH was increased in the range of 2.0–7.0, showing a linear response in the pH range of 3.85–6.25.
신생아중환자실 간호사가 인식한 간호업무의 중요도와 수행 자신감
임희문(Lim, Heemoon),이혜정(Lee, Hyejung),김은숙(Kim, Eunsook),김효영(Kim, Hyoyeong),장은경(Jang, Eunkyung) 한국간호교육학회 2022 한국간호교육학회지 Vol.28 No.1
Purpose: Neonatal nurses are expected to have clinical competency to provide qualified and safe care for high-risk infants. An educational intervention to enhance nurses’ clinical competence is often a priority in the nursing field. This study was conducted to explore nurses’ perceived importance and performance confidence of nursing care activities in neonatal intensive care units. Methods: One hundred forty-one neonatal nurses from seven hospitals across South Korea participated in the online survey study. The scale of neonatal nursing care activity consisted of 8 subdomains including professional practice (assessment, diagnosis, planning, intervention, evaluation, education, research, and leadership). The Importance-Performance Matrix was used to analyze the importance of and confident performance in each of the nursing subdomains. Results: Both importance and performance confidence increased as nurses’ age (p=.042 and p<.001) and clinical experience (p=.004 and p<.001). Participants scored relatively higher in importance and performance confidence in the professional practice subdomains (assessment, intervention, evaluation), but scored lower in the education and research subdomains. Conclusion: To provide evidence-based nursing care for high-risk infants in neonatal intensive care units, educational interventions should be developed to support nurses based on the findings of the research.
Prevalence and impact of airway diseases on clinical outcomes in idiopathic pulmonary fibrosis
( Heemoon Park ),( Jaeyoung Cho ),( Jinwoo Lee ),( Young Sik Park ),( Chang-hoon Lee ),( Sang-min Lee ),( Chul-gyu Yoo ),( Young Whan Kim ),( Sung Koo Han ),( Sun Mi Choi ) 대한내과학회 2022 The Korean Journal of Internal Medicine Vol.37 No.2
Background/Aims: The prevalence and effects of airway diseases, including asthma, eosinophilic bronchitis (EB), chronic obstructive pulmonary disease (COPD), and asthma-COPD overlap (ACO) have not been thoroughly studied in patients with idiopathic pulmonary fibrosis (IPF). This study aimed to evaluate the prevalence of airway diseases in patients with IPF and to identify the differences in symptoms based on the presence of airway diseases. Methods: This single-institution prospective cohort study was conducted from June 2017 to September 2018, at the Seoul National University Hospital. Spirometry with bronchodilator, methacholine bronchial provocation test, induced sputum with eosinophil stain, and exhaled nitric oxide were performed to confirm the presence of airway disease. The modified Medical Research Council (mMRC) dyspnea scale, COPD assessment test (CAT), St. George’s Respiratory Questionnaire (SGRQ), EuroQol-5 dimension (EQ-5D) index, and cough-specific quality of life questionnaire (CQLQ) data were collected to assess symptom severity. Results: Total 147 patients with IPF were screened, and 70 patients were analyzed. The prevalence of airway diseases in the participants was as follows: 5.0% had COPD, 1.7% had asthma, 3.3% had ACO, and 1.7% had EB. The mMRC, CAT, SGRQ, EQ-5D, and CQLQ scores did not differ regardless of combined airway disease. After 3 months, the SGRQ (p = 0.028) and CQLQ (p = 0.030) scores were significantly higher in patients with airway disease than in those without. Conclusions: The prevalence of airway diseases in patients with IPF is low, but when airway diseases are accompanied by IPF, symptom severity and quality of life may worsen rapidly.
Studies on the Analyses for the Scale of FGD Process
Kim, Kyeongsook,Yang, Sukran,Song, Haeran,Eum, Heemoon 한국화학공학회 2002 Korean Journal of Chemical Engineering Vol.19 No.1
During the period of preventive maintenance of the Ulsan power plant, the scale was sampled from riser pipes, sparger pipes and other important parts in the FGD facilities. Various analyses such as concentration analysis, surface morphology, and crystal structure have been performed on the scale sample. The riser pipe scale was a gypsum dihydrate form. The sparger pipe scale was different from two units, namely, gypsum dihydrate form was obtained from that of unit 6; on the other hand, 1 to I ratio of gypsum dihydrate form and anhydrate form was elucidated from that of unit 4. Next, the analyses of GCP spray nozzle head scale, gas-cooling zone scale, and BUF inlet duct scale were focused on the effect of base material. On the basis of the analytical results, we expect to elucidate the formation process of the scale, and finally to improve the FGD process.
Tricuspid Edge-to-Edge Repair Versus Tricuspid Valve Replacement for Severe Tricuspid Regurgitation
Jihoon Kim,Heemoon Lee,Ji-Hyun Jung,Jae Suk Yoo 대한심장학회 2023 Korean Circulation Journal Vol.53 No.11
Background and Objectives: Tricuspid valve (TV) repair techniques other than annuloplasty remain challenging and frequently end in tricuspid valve replacement (TVR) in complicated cases. However, the results of TVR are suboptimal compared with TV repair. This study aimed to evaluate the clinical effectiveness of TV edge-to-edge repair (E2E) compared to TVR for severe tricuspid regurgitation (TR). Methods: We retrospectively reviewed 230 patients with severe TR who underwent E2E (n=139) or TVR (n=91) from 2001 to 2020. Clinical and echocardiographic results were analyzed using inverse probability of treatment weighting analysis and propensity score matching. Results: The two groups showed no significant differences in early mortality and morbidities. During the mean follow-up of 106.2±68.8 months, late severe TR and TV reoperation rates were not significantly different between groups. E2E group, however, showed better outcomes in overall survival (p=0.023), freedom from significant tricuspid stenosis (TS) (trans-tricuspid pressure gradient ≥5 mmHg, p=0.021), and freedom from TV-related events (p<0.001). Matched analysis showed consistent results. Conclusions: E2E for severe TR presented more favorable clinical outcomes than TVR. Our study supports that E2E might be a valuable option in severe TR surgery, avoiding TVR.
AB INITIO CALCULATIONS OF STRONGLY CORRELATED ELECTRONS: ANTIFERROMAGNETIC GROUND STATE OF $UO_2$
YUN YOUNSUK,KIM HANCHUL,KIM HEEMOON,PARK KWANGHEON Korean Nuclear Society 2005 Nuclear Engineering and Technology Vol.37 No.3
We have performed the density functional theory calculations of $UO_2$ using the spin-polarized generalized gradient approximation (SP-GGA) and the SP-GGA+U approach. The SP-GGA+U approach correctly predicts the insulating electronic structure with antiferromagnetic ordering, but the SP-GGA calculations predict metallic behavior. The cohesive properties obtained from the SP-GGA+U calculations are in good agreement with the available experimental results and previous calculations. The spin-polarized local density of states shows that the antiferromagnetic ordering of $UO_2$ is governed by 5f orbitals of uranium ion. Our calculations demonstrate that the strong correlation of U 5f electrons should be taken into account for a reliable description of $UO_2$ physics.