고등학교 기술교과에서 외래 용어의 구체적 설명 수업이 학업 성취도에 미치는 효과

계광선,최완식 한국기술교육학회 2001 한국기술교육학회지 Vol.1 No.2

The major purpose of this study was to have students improve their learning ability in technology subject through the understanding of the students' learning achievement effect causing from specific explanation about foreign-terminology in high school technology subject. Students were divided into two groups. On group was the specific foreign-terminology explanation group(experimental group), and the other group was the traditional instruction group(control group). Each group also was classified into two groups, high grade group and low grade group. To clarify the high and low group, middle range grade students were eliminated. So the 4 groups(EH: experimental high, EL: experimental low, CH: control high, CL: control low) were used in this study. The results of the study were (1) There was statistically strong evidence(F=10.69, p=0.0013) that the experimental group and the control group were different in learning achievement on the subject. The experimental group showed much high score on the test than the control group did. (2) There was no evidence(F=0.64, p=0.43) that the EH group and CH group were different in arning achievement on the subject. (3) There was also no evidence(F=0.23, p=0.63) that the EH group and EL group were different in learning achievement on the subject. (4) There was statistically strong evidence(F=9.89, p=0.0021) that the EL group and CL group were different in learning achievement on the subject.

미생물 컨소시엄에 의한 페놀수지 Resole의 분해

최원식,차민석,오계헌 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.1

Microbial consortia were screened for their ability to degrade resole at the sole carbon source. Five microbial consortia were derived from a plant site where a biological treatment of liqid waste stream of a manufacturing facility was located. Among the consortia, the test consortium, designated as MS2, displayed approximately 70% degradation of the substrate, 0.1 g of resole per liter, within the first twelve days of incubation but the degradation did not proceed to completion. pH was decreased and resole degradation was inhibited under the conditions. UV-spectroscopy was used quantitatively to monitor the residual concentrations of resole in the present work. UV-scans of spent culture showed that wavelength of maximum absorption was 216nm for resole.

수면량과 집중력의 상관관계

김병우,류지근,박우진,박계원,김미정,임지은,백대현,최재덕,최윤호,이가현,이관,김덕수 東國大學校醫學硏究所 2002 東國醫學 Vol.9 No.1

수면, 기억 그리고 학습의 연관성은 실제 매우 복잡하다. 많은 연구에도 불구하고 명확한 연구결과는 아직 없다. 우리는 이 연구에서 평소와는 달리 시험 전날 수면 변화 양상이 집중력에 어느 정도 영향력을 미치는지 알아보고자 하였고, 이를 이용해 효율적인 수면 관리를 할 수 있는 기초자료로 삼고자 하였다. 동국대 의대 본과 1학년생 중 지원자 30명과 본과 2학년생 10명을 대상으로 평상시 상태와 시험 직후 수면이 부족한 상태에서 각각 K-PES TEST를 실시하여 총 8항목에 걸쳐 암기력, 판단력, 단순반응의 변화정도를 검사하였다. 또 설문조사를 병행하여 결과에 영향을 미칠 수 있는 다른 인자들도 파악하였다. 수면량에 대한 부호 숫자 짝짓기(순간 판단력)을 검사한 결과, 인간의 최대 생리학적 기능은 꼭 수면부족에 의해 좌우되는 것은 아니다. 그러나, 수면감소는 피로를 증가시키고, 동기부여를 감소시키나 단, 새로운 사실을 학습하는 데에는 큰 영향을 끼치지 않는다. 즉, 수면부족으로 장시간 깨어있는 것은 정확성과 반응성을 떨어뜨린다. 흡연에 대한 부호 숫자 짝짓기(순간 판단력)을 검사한 결과, 니코틴의 수면에 대한 상호관계는 알려지지 않았고, 인간의 감정이나 의식, 인식에 영향을 주는 것으로 알고있지만, 장기적은 측면에서 흡연이나 알코올은 인식능력과 무관한 것 같다. 카페인에 대한 숫자 외우기(암기력)검사 결과, 카페인은 spacial selective attention에는 특별한 영향을 주지 않지만 지각과정이나 주의 집중에 큰 효과를 주며, 인간의 의식 수행에 긍정적인 효과를 준다. 즉 카페인은 활력, 혼란, 피로상태를 변화시키고 visual analog scales에서 휴식상태에 가까운 양상을 나타낸다. 또 48시간 동안 수면을 취하지 않은 사람에게 카페인은 집중력과 장시간의 좋은 기분을 유지하게 하였다. 그러나 규칙적, 비규칙적으로 먹는 사람간에는 인지수행력의 차이를 보이지 않으며 상용자에서는 상당한 내성이 보인다. 수면패턴에 대한 숫자 더하기(순간 판단력)검사 결과, 집중력은 수면패턴에 의해서도 영향을 받고, 수면패턴이 바뀌게 되면 순간판단력을 저하시킨다. This study was performed to evaluate relationship of sleep and attention, and to control sleep effectively. We conducted a K-PES test of 40 medical students. K-PES contains eight elements, for example, simple response, selective response, color pairing, OddEven discrimination, number addition, number-symbol matching, memory, right-tapping, left tapping. Through these, we tested changes of memory, judgement, simple response. And we conducted a questionnaire survey to exclude bias. Results are as follows. As a results of number-symbol matching test, we know that sleeplessness is not complete responsible for physiologic function for humans. But, decreased sleep increases fatigue and decreases motivation, but no influence on learning new materials. So, long term sleeplessness decreases precision and responsibility. As a results of number-symbol matching test on smoking, a relationship of nicotine and sleep is not certain. A point of view in long term period, smoking and drinking is not related cognition, even if we know that those influence mood, consciousness and cognition. As a results of memory work test on caffeine, caffeine does not influence spacial selective attention, but mainly does perception, attention and consiousness process. Namely caffeine changes energetic activities, chaos, fatigue states and shows resting state in visual analog scales In sleeplessness for 48 hours, caffeine produced attention and good mood for a long time. But, in case of cognitive process no significance shows in regular or irregular diet. Regular diet shows high resistance. As a results of number addition test on sleep patterns, seep patterns influence attention, changes of sleep patterns decrease a moment judgement.

A rare case of extensive papillary muscle calcification in senile cardiac calcification syndrome

김은진;송봉근;강민호;손형래;홍수민;박동원;허승혜;김계연;최석구 인제대학교 2011 仁濟醫學 Vol.32 No.-

광범위 유두근 석회화는 흔하지 앉으며, 원인과 임상적 중요성에 관한 문헌만 드물게 찾아볼 수 있다. 반면에 작은 석회 침착은 노인에서 흔하며 심장 첨부에 주로 나타난다. 유두근 석회화는 관상동맥질환, 확장성 심근병증, 승모관 질환, 고칼슘혈증, 그리고 말기신부전에서 인산칼슘의 중가와 연관성이 있다. 저자는 심장초옴파와 MDCT를 통해 진단된 전외측 유두근의 광범위 석회화의 드문 사례가 있어 보고한다.

용탕가압침투 AS52 Mg/Al18B4O33w 복합재료의 크리프 특성

최계원 ( Kye Won Choi ),박용하 ( Yong Ha Park ),박봉규 ( Bong Gyu Park ),박용호 ( Yong Ho Park ),박익민 ( Ik Min Park ),조경목 ( Kyung Mox Cho ) 대한금속·재료학회 2008 대한금속·재료학회지 Vol.46 No.7

사과 및 배의 외형적 품질에 관한 소비자 선호도

박계원(Kye-won Park),조성연(Seung-Yeon Jo),홍의연(Eui-Yon Hong),이재선(Jae-Sun Lee),최원일(Won-Il Choi),김이기(Yee-Gi Kim) 한국원예학회 2014 한국원예학회 학술발표요지 Vol.2014 No.10

정전 분무를 이용한 미세 물 액적 생성 및 습식 사이클론 적용 방안에 관한 연구

최종원(Jong Won CHOI),정대헌(Dae Hun CHUNG),이계중(Kye Jung LEE),김정근(Jeong Guen KIM),최영찬(Young Chan CHOI),이욱현(Wook Hyun LEE),우영민(Young Min WOO),오상현(Sang Hyun OH),윤민혜(Min Hye YOUN) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6

A historically well-known technique for atomizing the liquid water droplets may be electrospray, which is induced by electrostatic charging inside a confined geometry such as needle, nozzle or slit. Based on the Rayleigh’s theory of instability and Taylor’s theory, the electrospray enables to produce fine water droplets as forming a conical shape (Taylor cone) due to the highly concentrated free charge from high intensity of electrical potential between two oppositely charged electrodes. We herein applied this technology to the wet electrostatic precipitator, especially in cyclone structure. The wet electrostatic precipitator has been reported to possess a few flaws such as un-uniform water film formation on the wall, excessive waste water and large energy consumption. Applying the negative potential to the needles and the positive potential to the collector body, we observed sub-100㎛ water droplets are generated by means of an electrospraying process without any pressure. Such highly charged droplets pull the fine particles inside a flue gas, stick to the collector body and then finally free fall down. In this study, we designed and fabricated the electrospray driven wet cyclone electrostatic precipitator, investigating the particle collection performance with the tangential velocity of ~10 m/s at the cyclone inlet, for various voltages and water flowrates. The experimental results show that the effective flowrate through one needle for reaching the PM2.5 collection efficiency of 95% and the power consumption per a needle are measured as 20 ccm and 0.35 W (35 kV and 0.01 mA). Comparing that the the ratio of water to flue gas and power consumptions of the previously commercialized wet electrostatic precipitators for the treatment capacity of 50 CMM have been reported as 1.0 L/m<SUP>3</SUP> and 840 kW, our measurement gave us 0.2 L/m<SUP>3</SUP> and 175 W, which are merely 20% and 20.8% over those of the commercialized one, respectively

연구보문 : 벼 무논직파 재배시 완효성비료 적정시비량

최민규 ( Min Kye Choi ),구본일 ( Bon Il Ku ),강신구 ( Shin Gu Kang ),백남현 ( Nam Hyun Back ),박태선 ( Tae Seon Park ),이경보 ( Kyeong Bo Lee ),박홍규 ( Hong Kyu Park ),김영두 ( Young Doo Kim ),최원영 ( Won Young Choi ),고재권 ( J 한국국제농업개발학회 2011 韓國國際農業開發學會誌 Vol.23 No.3

벼 무논직파재배시 시비노력 절감 및 쌀 품질을 향상시키기 위하여 2008년 및 2009년에 완효성비료 질소 시비량을 달리하여 검토한 결과를 요약하면 다음과 같다. 1. 쌀수량과 완전미 수량은 관행질소시비량(9 kg/10 a) 대비 80% 수준인 완효성비료를 10 a당 질소 7 kg을 시용하였을 때 비슷한 경향을 보였다. 2. 완효성비료를 10 a당 7 kg정도 시용하면 관행시비(9 kg/10 a) 보다 백미의 단백질함량이 낮아졌다. 3. 완전립 비율은 완효성비료를 10 a당 9 kg을 시용하였을때 유의성은 없으나 관행시비(9 kg/10 a)에 비해 약간 낮았으나, 7 kg/10 a을 시용하였을 때는 관행시비에 비해 높은 경향이었다. 따라서 남부지역에서 벼 무논직파 재배시 벼 생육, 완전미 수량 및 쌀 품질 등 을 고려해 볼 때 완효성비료의 적정 시비량은 10 a당 7 kg정도였다. This study was conducted to investigate the effectiveness and optimum rate of the slowreleasing fertilizer (SRF: N-P2O5-K2O = 18-12-13%) for drill seeding on flooded paddy surface by large scale direct drill seeding machine in Honam plain area in 2008 and 2009. To set the optimum rate of the SRF, three levels of nitrogen rate such as 5, 7, and 9kg/10a were compared with conventional compound fertilizer (N-P2O5-K2O = 9-4.5-5.7) application method as basal fertilization, top dressing at tillering stage, and at panicle initiation stage. Yield of milled-rice and head rice response to 7kg/10a rate of SRF were statistically insignificant to the results of conventional fertilization. These results indicate that the amount of nitrogen applied can be reduced by 20 % without reducing the grain yield and quality level. When using 7kg/10a of SRF, the protein content became lower and head rice ratio became higher than that of conventional nitrogen split application method. Considering rice growth, head rice yield and rice quality, the optimum amount of slow-releasing fertilizer was estimated 7kg/10a for direct drill seeding on flooded paddy surface in southern plain area.

Poster Session : PS 0651 ; Respiratory Medicine ; Clinical Characteristics and Prognostic Factors of the Patients Who Admitted in Intensive Care Units with Nursing and Healthcare-Associated Pneumonia

( Ji Sun Choi ),( Myoung Kyu Lee ),( Sang Ha Kim ),( Won Yeon Lee ),( Suk Joong Yong ),( Kye Chul Shin ),( Jiwon Choi ),( Yeun Seoung Choi ),( Jae Ho Seong ),( Ye Ryung Jung ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Background: Limited studies have been identifi ed about nursing and healthcare-associated pneumonia (NHCAP) requiring intensive care unit (ICU) admission. We evaluated the clinical and microbiological characteristics of NHCAP patients admitted to the ICU. Methods: NHCAP was categorized as four groups. Reviewed database included age, gender, comorbid diseases, laboratory data and microbiological Results: The severity of pneumonia was assessed by using the pneumonia severity index (PSI) and CURB-65. The 30-day mortality and duration of ICU stay were evaluated as endpoints Results: Total 428 patients (men, 67.1%) were reviewed. The mean age was 71.2 ± 11.9 year-old. Thirty-day mortality was 25.5%, and duration of ICU stay was 13.8 ± 13.3 days. Mortality (P = 0.349) had no signifi cant difference among four groups although duration of ICU stay (P = 0.008) was signifi cantly longer in group C and D. When we performed multivariate logistic analysis using signifi cant variables, PSI score (OR 1.015 95% CI 1.004-1.026, P = 0.009), serum HCO3- level (OR 0.954 95% CI 0.918-0.993, P = 0.020), duration of ICU stay (OR 0.971 95% CI 0.950-0.993, P = 0.010), multidrug-resistant (MDR) pathogens including ESBL-producing K. pneumoniae (OR 2.688 95% CI 1.237-5.840, P = 0.013) and MDR A. baumannii (OR 3.081 95% CI 1.504-6.311, P = 0.002) were signifi cantly associated with 30-day mortality. Conclusions: ESBL-producing K. pneumoniae and MDR A. baumannii were more often isolated and associated with mortality in NHCAP in ICU patients, therefore these MDR pathogens as well as PSI score should be considered as prognostic factors in NHCAP.

정전분무 습식 사이클론의 초미세먼지 저감 성능 연구

최종원(Jong Won CHOI),김진한(Jin Han KIM),이영주(Young Joo LEE),박주형(Ju Hyung PARK),이계중(Kye Jung LEE),김정근(Jeong Guen KIM),최영찬(Young Chan CHOI) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.6

Nowadays the ultrafine particle emission from the vehicles, power plants, and industries has been revealed to cause the critical respiratory diseases like silicosis and asbestosis, thereby the atmospheric particulate matter (PM) concentration is being considered as a proxy indicator of air pollution. In particular, the reduction of ultrafine particle concentration inside a combustion flue gas becomes an inevitable option to many researchers. Differently from the previous dry electrostatic precipitator (ESP), it is necessary to employ water to capture such ultrafine particles in order to satisfy the stricter environmental regulations. Herein, we proposed, designed and tested one of the promising systems that consists of a simple grounded cyclone geometry and electrical insulating high voltage water nozzle, called Electrospary Cyclone Precipitator (ECP). From experimental results, we obtained the maximally 91.5% collection efficiency of Sub-1um particles (PM1.0) with water-gas ratio of 0.1 L/m³, water consumption of 12 ccm for every single nozzle, electrical field strength of 6.7 kV/cm and the specific corona power of 20 W/(m³/min). Comparing the operating parameters of ECP with the previously proposed electrospray ESP, we saved 85% water and 43% power consumptions, respectively.