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Aspen Dynamics(TM)와 ACM을 이용한 용융탄산염 연료전지 시스템의 모사 및 제어
전경연 ( Kyoung Yein Jeon ),곽하연 ( Ha Yeon Kwak ),경지현 ( Ji Hyun Kyung ),이태원 ( Tae Won Lee ),문길호 ( Kil Ho Moon ),이기풍 ( Gi Pung Lee ),류아림 ( Ah Rim Yoo ),양대륙 ( Dae Ryook Yang ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.4
Recentincreasing awareness of the environmental damage caused by the CO2 emission of fossil fuelsstimulated the interest in alternative and renewable sources of energy. Fuel cell is a representative example of hydrogen energy utilization. In this study, Molten Carbonate Fuel Cell system is simulated by using Aspen(TM). Stack model is consisted of equilibrium reaction equations using ACM(TM)(Aspen Custom Modeler). Balance of process of fuel cell system is developed in Aspen Plus(TM) and simulated at steady-state. Analysis of performance of the system is carried out by using sensitivity analysis tool with main operating parameters such as current density, S/C ratio, and fuel utilization and recycle ratio. In Aspen Dynamics(TM), dynamics of MCFC system is simulated with PID control loops. From the simulation, we proposed operation range which generated maximum power and efficiency in MCFC power plant.
리더십 독서프로그램이 유아의 자아존중감과 친사회적 행동 및 공격성에 미치는 효과
고선옥(Go Seon-Ock),전경아(Jeon Kyung-Ah) 한국영유아보육학회 2010 한국영유아보육학 Vol.0 No.61
본 연구는 리더십 독서프로그램이 유아의 자아 존중감과 친사회적 행동 및 공격성에 미치는 영향을 검증하기 위해 이루어졌다. 연구대상은 J시 2개 유아교육기관에서 선정된 만 5세 유아 총 40명이며, 이 중 B유치원에 다니는 유아 20명을 실험집단으로 D유치원에 다니는 유아 20명을 통제집단으로 배정하였다. 유아의 자아존중감과 공격성은 질문지법으로 측정하였고, 유아의 친사회적 행동은 면접법을 활용하여 검사하였다. 본 연구의 결과는 다음과 같다. 첫째, 리더십 독서프로그램이 유아의 자아존중감의 향상에 긍정적인 영향을 미치는 것으로 나타났다. 둘째, 리더십 독서프로그램이 유아의 친사회성 향상에 긍정적인 효과를 미치는 것으로 나타났다. 셋째, 리더십 독서프로그램이 유아의 공격성 감소에도 긍정적인 효과를 미치는 것으로 나타났다. The study was intended to practically verify the effect on children's self-esteem, pro-social behavior, aggressive behavior based upon the leadership program centered fairy tales. The subject in the study were 40 children attending nursery located in J city. Experiment group children were 20 of the age of 5 years old and compared group were 20 of the 5 years old. children's self-esteem and aggressive behavior were measured by questionnaire and children's pro-social behavior was measured by interview. The results were as follows. First, it was found that the leadership program centered fairy tales had positive effect on improvement of children's self-esteem. Second, it was found that the leadership program centered fairy tales had positive effect on improvement of children's pro-social behavior. Third, it was found that the leadership program centered fairy tales had positive effect on reduction of children's aggressive behavior.
보육교사의 창의적 인성과 유아 놀이권리인식이 놀이교수효능감에 미치는 영향
한지현(Han Jihyeon),전경아(Jeon Kyung Ah) 학습자중심교과교육학회 2020 학습자중심교과교육연구 Vol.20 No.7
본 연구는 보육교사의 창의적 인성과 유아의 놀이권리에 대한 인식 및 놀이교수효능감 간의 관계를 살펴보고, 창의적 인성과 놀이권리에 대한 인식이 놀이교수효능감에 미치는 영향을 검증하는데 있다. 연구의 참여자는 전북 J시와 K시에 소재한 어린이집에서 근무하는 보육교사 189명이다. 창의적 인성, 놀이권리에 대한 인식, 놀이교수효능감을 설문지를 사용하여 측정하였으며, 자료분석을 위해 상관분석과 중다회귀분석을 실시하였다. 연구결과는 다음과 같다. 첫째, 보육교사의 창의적 인성 및 놀이권리인식과 놀이교수효능감 간에 유의미한 정적 상관관계를 가지는 것으로 나타났다. 둘째, 창의적 인성 하위요인 중 독자성과 놀이권리인식 하위요인 중 놀이의 교육적 가치에 대한 인식이 놀이교수효능에 대한 신념에 영향을 미치는 것으로 나타났다. 또한, 집요성과 놀이의 교육적 가치에 대한 인식이 놀이교수결과에 대한 기대에 영향을 미치는 것으로 나타났다. 본 연구는 놀이교수효능감에 관련된 창의적 인성과 놀이권리인식의 특성을 밝힘으로써 보육교사의 심리적 구인에 대한 이해를 돕고 놀이교수효능감 제고를 위한 기초자료를 제공하였다는데 의의가 있다. The purpose of this study is to examine the effects of creative personality and play rights perception on play teaching efficacy. The subjects of study were 189 child-care teachers who worked in child-care centers in J and K city. Creative personality, perception of play rights, and play teaching efficacy were measured using questionnaires, and correlation analysis and multiple regression analysis were conducted for data analysis. The result were as follows. First, there was a significant positive correlation among creative personality, recognition of play rights, and play teaching efficacy of child-care teachers. Second, the independence in creative personality and the perception of the educational value of play in the perception of play right had a significant effect on the belief about play teaching efficacy. In addition, the persistence and the perception of the educational value of play influenced the expectation of play teaching results. This study is meaningful to help the understanding of psychological factors of child-care teachers by revealing the characteristics of creative personality and play right perception related to play teaching efficacy.
PLT buffer층의 삽입에 따른 강유전 PZT박막의 특성 향상
임성훈,이은선,정현우,전경아,이상렬,Lim, Sung-Hoon,Lee, Eun-Sun,Chung, Hyun-Woo,Jeon, Kyung-Ah,Lee, Sang-Yeol 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.2
The Pb(Zr,Ti)O$_3$ thin films were fabricated with Pb(La,Ti)O$_3$ buffers in-situ onto Pt/Ti/SiO$_2$/Si substrates by pulsed laser deposition method. We have observed the increase of the remanent polarization using PLT buffers. The remanent polarization value of 33.4 $\mu$C/$\textrm{cm}^2$ and the coercive field value of 66.4 kV/cm were obtained when the PLT tufter was deposited for 15 seconds. Enhancement of the polarization is resulted from the enhanced orientation of PZT thin film because of the PLT buffet layer.
복부-골반 전산화 단층촬영으로 진단된 Fitz-Hugh-Curtis 증후군의 임상양상
신상현 ( Sang Hyun Shin ),김영아 ( Young Ah Kim ),장두영 ( Doo Young Chang ),전경철 ( Kyung Chul Jun ),전명권 ( Myung Kwon Jeon ),김경아 ( Kyung Ah Kim ) 대한산부인과학회 2011 Obstetrics & Gynecology Science Vol.54 No.1
Objective: To analyze the clinical characteristics in patients of Fitz-Hugh-Curtis syndrome diagnosed by abdomino-pelvic computed tomography (CT). Methods: We retrospectively examined the clinical courses of 62 patients who visited with abdominal pain from March 2005 to July 2010. The clinical manifestations, physical examination, laboratory manifestations, CT findings, treatments, and prognosis were analyzed. Results: The mean age of the patients ranged from 13 to 48 years and their average age was 28.56±8.77. Twenty-eight of them (45.2%) were married but all the subjects had sexual experience. The chief complaints requiring a visit to the hospital were abdominal pain (74.2%), vaginal discharge (19.4%), nausea and vomiting (3.2%), and fever (1.6%). On physical examination, location of tenderness was right upper-quadrant tenderness (41.9%), whole abdomen (37.1%), right lower-quadrant (24.2%), lower abdomen (16.1%), and epigastric area (6.5%). The isolation of bacterial pathogens was found in 26% (13/62) of them. Polymerase chain reaction tests for Chlamydia trachomatis were positive in 34 patients (70.3%). All 62 cases showed liver capsular enhancement on CT in the early arterial phase. Peritoneal thickening (24.2%) and fluid collection (27.4%) were observed in the perihepatic area. of 56 patients, 49 patients (87.5%) improved following antibiotic therapy and conservative care. Seven patients did not respond to antibiotic therapy, their symptoms improved after laparoscopic surgery. Conclusion: For women of reproductive age with acute pain in the upper right abdominal alone or together with pain in the lower abdomen, Fitz-Hugh-Curtis syndrome should be suggested during examination. Moreover, in cases suspected to be Fitz-Hugh-Curtis syndrome, gynecologic examination, abdomino-pelvic CT, and tests for C. trachomatis could provide a more rapid and accurate diagnosis. Also, education and continuous follow up after therapy would be needed.