건물에너지 모니터링 및 분석에 관한 연구

박윤철 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.2

In this study, building energy conservation opportunities were proposed in order to minimize the energy consumption and to cut off the operation cost through the optimum selection and application of building equipment. Most of energy consumption in the commercial building comes from delivery equipment of heat transfer fluid such as fans and pumps. It is recommended by this study that the delivery equipment should be changed from constant volume system to variable volume system.

인버터 열펌프의 에너지효율 평가에 관한 연구

박윤철 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.1

An analysis and experimental work on the energy efficiency characteristics of an inverter heat pump for residential air conditioner have been performed by suggested evaluation method and testing the heat pump performances in the psychrometric test chambers. An 1RT nominal cooling capacity inverter heat pump was used for the experiments which was consisted with a rolling piston type rotary compressor, indoor and outdoor finned tube type heat exchangers, a capillary tube, two accumulators and a four-way valve. The analysis was conducted with equations based on ANSI/ASHRAE standard 116 and ARI standard 240 for evaluation of energy saving and yearly operation characteristics of heat pumps. The experiment has been performed with various operation frequencies of the compressor for the capacity control in response to the change of outdoor conditions or cooling load. As results of the seasonal performance test of the inverter heat pump including the performance test for intermediate speed, the test heat pump had the performance degradation coefficient of cyclic operation of 0.19, and the calculated cooling seasonal energy efficiency ratio of 3.72 in Seoul.

충수염의 임상적 고찰과 초음파의 유용성

박정배,양혁준,김형수,황성연,박철완,이근 대한응급의학회 1995 대한응급의학회지 Vol.6 No.2

Appendicitis is the most common acute abdomen in Emergency Medical Center & outpatient department. But sometimes, it is difficult for us to diagnose because of clinically variable symptoms. We reviewed the ultrasonographic findings and analyse 521 cases of appendectomy patients about its distribution of sex and age, seasonal prevalence, clinical symptom and signs, laboratory findings, duration from onset of symptom to arrival at hospital, duration from arrival at hospital to operation, vital signs, operative results, and associated diseases, which were treated at the department of General Surgery & Emergency Medical Center in Chung Ang Gil Hospital from July, 1994 to June, 1995. The results were as follows : 1. The most common age group was second decade. And male to female ratio was 1.43:1. Seasonal variation was not significant. 2. Of 521 cases, 141 cases(27.1%) visited the hospital within 24 hours from the onset of symptom, and 259 cases(49.7%) visited between 24 to 48 hours. 3. In duration from arrival to operation, the cases within 6 hours were 263 (50.5%), the cases between 6 and 12 hours were 131(25..1%). 4. In systolic blood pressure, cases below 90mmHg were 19(3.6%), cases above 160mmHg were 23(4.4%). Below 60mmHg diastolic pressure were 55 cases(10.6%), cases above 110mmHg were 9(1.7%). In pulse rate, above 90 rate/min were 171(32.8%). 5. On admission leukocytosis was found in 413 cases(79.3%) and 342 cases of them were pathologic appendicitis. 6. Ultrasoundgraphy was performed in the 87 cases, but 23 cases were suggested appendicitis. Among 23 cases, 22(95.7%) revealed pathologic appendicitis at ooperation and labortatory examination. Of the 64 cases which were normal on ultrasonography, only 2 cases(3.1%) were proved to be appendicitis. 7. The results of 496 operations without ultrasonography were appendicitis in 390 cases(78.6%), mesenteric lymphadenopathy 36(7.3%), pelvic inflammatory disease 28(5.6%), fecalith 15(3.0%), terminal ileitis 8(1.6%), diverticulitis 7(1.4%), urinary tract stones 5(1.0%), cecal cancer 2 cases, right ovarian tumor 2 cases, tubo-ovarian abscess 2 cases, grater omentum internal hernia 1 case. Our results showed that the sensitivity of ultrasonohraphy was 95.8% and the specificity 98.4% in the diagnosis of appendicitis, It suggests that the ultrasonography is very helpful in the diagnosis & differential diagnosis of acute appeendiditis.

멀티에어컨의 부분부하성능 평가에 관한 연구

박윤철 제주대학교 공과대학 첨단기술연구소 2004 尖端技術硏究所論文集 Vol.15 No.1

Although, COP or EER was used as a performance evaluation parameter in refrigeration and air conditioning area, most of countries use the seasonal energy efficiency ratio(SEER) as it's energy efficiency performance. An integrated part load value(IPLV) is another parameter that is used in chiller system. The IPLV is a parameter which indicates a part load performance of the system that runs at ordinary operating conditions. In this article, the difference between the SEER and IPLV is discussed briefly and presented a IPLV calculation result in a multi-type air conditioning system.

탁구선수들의 자기효능감이 경기 승패에 미치는 영향

이미연,박철용 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.4

The research was devised to verify possibility of application self-efficacy thesis into real situation ping-pong game and to study factors affecting on ping-pong players' self-efficacy and final consequence based on Bandura's self-efficacy thesis. The analysis was started establishing self-efficacy and the final result as independent variables and dependent variables, subjects(high school and college students) and superior/ inferior athletes(whether or not experience quarter final). The significance was α= .05. The result is this. Firstly, analyzing self-efficacy with subjects(high school and college students), college students get higher points than high school students. And the result of the relation between self-efficacy and the final consequence is that a group which shows high self-efficacy achieves more wins compared with a group showing low self-efficacy in both subjects. In comparison with subjects(high school and college students), high school students get higher degree of factors affecting self-efficacy and the final consequence before a game. Secondly, analyzing self-efficacy with gender, male showed higher degree than female. And the result of the relation between self-efficacy and the final result is that a group which shows high self-efficacy wins more in both of them Compared with male and female, both male and female are the factors of self-efficacy and the victory or defeat before a game. Lastly, analyzing self-efficacy with superior/inferior athletes, superior athletes showed higher self-efficacy than inferior athletes. And the result of the relation between self-efficacy and the final result is that a group which gets high self-efficacy achieves more wins. In comparison with superior and inferior athletes, inferior athletes affect on the self-efficacy and the final consequence more than superior athletes.

임상화학 검사의 Delta Check System 개발 및 정도관리 효율성 검토

권계철,임춘화,김문희,박연보 충남대학교 의과대학 지역사회의학연구소 2001 충남의대잡지 Vol.28 No.1

Background : The application of the delta check in tests in general chemistry detects both random and clerical errors, thus enhancing the reliability of tests. However, since this approach adds the burden of confirming the results to the laboratory, it has the disadvantage of lengthening the turn around time of tests. We speculated that an online delta check system needed to reduce the turn around time. We developed delta quality control system and evaluated its effectiveness of quality control in clinical chemistry. Methods : We developed an online delta check system based on the client-server paradigm. We used IBM PentiumⅢ PC as server and as clients. The database system used was powerbuilder 6.0. Results : In the system we developed, delta screening was performed when test results were input to the computer. The decision over the delta screening was made by comparing it against patient's clinical information and cumulative results within the same screen. Conclusions : The developed delta check method made it available to reduce the turn around time previously spent on delta screening by eliminating the batch processing of tests which was needed in previous approaches separate query cumulative results and patient's clinical informations for screening purposes.

소아·청소년기 교정 환자의 음파 칫솔과 일반 칫솔의 치태 제거 효과 비교

김지연,신철환,박기태 大韓小兒齒科學會 2005 大韓小兒齒科學會誌 Vol.32 No.3

본 연구의 목적은 소아·청소년기 교정환자에 있어서 음파칫솔과 일반칫솔의 치태 제거 효과를 비교하는 것이다. 삼성서울병원 소아치과에서 고정식 교정 장치 치료를 받는 건강한 소아·청소년 환자 21명 (여자: 10명, 평균나이 14.57±2.28년; 남자: 11명, 평균나이 13.04±1.55년)을 대상으로 음파 칫솔(Sonicare^(?), Optiva Corp., 미국)과 교정용 일반 칫솔(Orthocare^(?), Tomy International Inc., 일본)을 사용하여 총 4회의 내원 시 각각 2회씩 회당 2분간 칫솔질을 하도록 하였다. 칫솔질 전과 후의 치태지수를 Ainamo와 Bay의 Visible Plaque Index를 변형한 방법으로 측정하여 그 전후 차이를 비교하였다. 음파 칫솔이 61.79%(±7.95%), 일반 칫솔은 69.19%(±10.08%)의 치태 감소율을 나타내어 통계학적으로 유의한 차이를 보였다(p<0.05). 음파 칫솔의 경우 남자에서 63.07%(±8.64%), 여자에서 60.39% (±7.30%)의 치태 감소율을 나타냈고(p>0.05), 일반칫솔의 경우 남자에서 69.33%(±10.14%), 여자에서 69.03%(±10.55%)의 치태 감소율을 나타내어 통계학적으로 유의한 차이는 보이지 않았다(p>0.05). 연령에 따른 치태 제거 효과 실험 대상자들의 연령범위에서 통계학적으로 유의할만한 연관성이 없었으며 (p>0.05) 음파 칫솔의 경우와 일반칫솔의 경우에도 통계학적으로 유의할 만한 연관성이 없었다(p>0.05). 본 연구에서, 고정식 교정 장치를 부착한 소아·청소년기 환자에서 일반 칫솔의 치태 제거 효과가 음파 칫솔의 치태 제거 효과보다 컸다(p<0.05). The aim of this study was to compare the efficiency of sonic and manual toothbrush in decreasing plaque accumulation in young orthodontic patients. Twenty one healthy orthodontic patients attending department of pediatric dentistry at Samsung Medical Center were chosen for the study. The subjects were randomly assigned to either sonic or manual toothbrush and instructed to brush for 2 minutes. Plaque score was assessed with the modified Visible Plaque Index (VPI) before and after brushing. Each brush was repeated twice. A mean plaque reduction of sonic toothbrush was 61.79%(±7.95) compared to 69.19%(±10.08) of manual toothbrush(p<0.05). With the sonic toothbrush, male presented a mean plaque reduction of 63.07%(±8.64) while female presented 60.39%(±7.30). For manual toothbrush, male presented 69.33%(±10.14) and female presented 69.03%(±10.55) reduction of plaque accumulation(p>0.05). There was no statistically significant correlation between age and plaque removal efficacy in this study(p>0.05). Manual toothbrush was significantly more efficient in removing plaque than the sonic toothbrush in young fixed orthodontic patients.

알코올 의존 환자의 MMPI 특성 : 임상 척도와 내용 척도를 중심으로

이윤경,오상우,류미경,박민철 圓光大學校 醫科大學 神經精神科學敎室 1999 圓光精神醫學 Vol.15 No.2

본 연구는 군집 분석을 이용하여 알코올 의존 환자의 MMPI 임상척도와 내용 척도의 특성을 알아보았다. 연구 결과, 60명의 남자 알코올 의존 환자들은 2개의 하위 유형으로 분류되었다. 첫 번째 집단은 모든 척도가 T 점수 45 ~ 55 범위에 있는 정상 유형이었고(n=40, 66.6%), 두번째 집단은 MMPI 타당도 척도의 L, F, K 가 역전된 V형이며 임상 척도는 6-8 유형을 보였다(n=20, 33.4%). 내용 척도에서도 두 집단간에 통계적으로 유의미한 차이가 있었는데, 첫 번째 집단은 프로파일이 정상범위에 속했으며, 두 번째 집단은 ANX, FRS, OBS, HEA, BIZ, ANG, HYP, LSE, SOD, TRT 척도의 T 점수가 첫 번째 하위 유형에 비해 의미있게 상승하였다. 본 연구는 MMPI 임상 척도와 내용 척도가 알코올 의존 환자의 임상적인 진단과 연구에 도움이 된다는 것을 시사한다. This study was to investigate the characteristics of MMPI clinical and content scales on patients with alcohol dependence by using cluster analysis. As a result, the 60 male patients with alcohol dependence were classified into two subtypes. The MMPI profile of first subtype was within normal range, 45~55 of T score(n=40, 66.6%), second subtype had the inverted V shape validity scales and 6-8 clinical scale profile(n=20, 33.4%). The content scale was statistically significant difference between two groups. First subtype was within normal range, second subtype had more elevated T score of ANX, FRS, OBS, HEA, BIZ, ANG, HYP, LSE, SOD, and TRT scale. This study suggest that the MMPI clinical and content scale can be helpful and applicable to clinical diagnosis and research in patients with alcohol dependence.

과수 조류피해 방지에 관한 연구

김영호,윤철구,임상철,손인창,박재혁,김동환,김선규 충북대학교 한국과학재단 지정 첨단원예기술개발 연구센터 2002 연구보고서 Vol.6 No.-

새로운 저비용 고효율 조류 피해 방지법의 개발을 위한 기초자료를 얻기 위하여, 현재 사과, 배 과수원에서 사용되고 있는 조류피해 방지 방법들의 정확한 효과를 서로 비교 검토하고, 아울러 충북지역 과수 재배 농가들을 대상으로 유해조류에 의한 피해 실태와 경제성 있는 조류 피해방지 방법에 대한 설문조사를 병행 실시한 결과는 다음과 같다. 1. 조류피해는 방조망 설치에 의해서만 완전히 방지할 수 있었으며, 조류 피해율별 손익계산 결과를 참고하여 이익이 있을 때는 표준방조망을 설치하고, 그렇지 않을 경우에는 설치비가 저렴하며 농가에서 간단히 시공할 수 있는 간이방조망 설치가 더 경제적인 것으로 판단되었다. 도내 과수 농가의 조류피해는 지역 간에 큰 차이가 있었으며, 음향적 방제인 버드가드와 보호봉지인 망사봉지에 의한 방제가 가장 효과적이었다. 그러나 버드가드는 높은 설치비용이 문제되므로, 퇴치 효과가 비슷하거나 더 우수하면서 저렴한 한국식 음향 기구를 개발할 필요가 있는 것으로 판단되었다. 보호봉지인 UV 봉지와 플라스틱 보호캡 및 망사봉지 처리는 품종에 관계없이 피해를 현저하게 감소시켰으나, 과실의 착색 등 품질에 미치는 영향에 대해서 추가적인 연구와 검토가 필요한 것으로 생각되었다. To obtain basic data for low cost-high efficiency control methods for bird damage, the available control methods currently in use mostly in Chungbuk Province were tested on site, and the control efficiency was compared. Also, a comprehensive survey of actual bird damage and the control methods on model apple and pear growers in Chungbuk Province was conducted. The results are summarized as follows. The perfect control for bird damage was possible only through bird net, it was recommended that profit-and loss account must be considered before installing bird net, and when the 'standard bird net' does not come up to break-even point, more economic and convenient 'simplified bird net' should be a alternative. Actual extent of bird damage varied according to the locality, and imported acoustic apparatus BirdGard^R, development of our own system with superior or same quality and reasonable price is necessary. Fruit bags such as UV bags, plastic protective caps, and net bags were highly effective for bird damage control, irrespective of fruit species and cultivar, but further study to resolve some problems such as poor coloration caused by bagging is necessary.

頭鍼이 中風患者의 단기간 NIHSS와 MBI에 미치는 영향

류재춘,박인범,김상우,김철홍,서정철,윤현민,장경전,송춘호,안창범 동의대학교 한의학연구소 2002 동의한의연구 Vol.6 No.-

Objective ; The aim of this study was to investigate the effect of Scalp acupuncture on recovery of motor disorders in stroke patients. Methods ; Twenty two patients with poststroke-hemiplegia were randomized into two groups. Ten patients(test group) treated by 2 methods-Scalp acupuncture and body acupuncture. The other twelve patients(control group) treated only by body acupuncture. The activity of daily living was measured with a National Institutes of Health stroke scale(NIHSS) and Modified Barthel Index(MBI). The therapy was performed one a day for 2 weeks. Results ; In terms of score of NIHSS, the test group showed statistically meaningful decrease after 2 week treatment, but the control group showed statistically meaningful decrease after 1 week(p<0.05). And in terms of score of MBI, the test group did not show statistically meaningful increase but the control group showed statistically meaningful increase after 1 week(p<O.05). There was no statistically meaningful difference after 1 and 2 week treatment between the groups. Conclusions ; These results support that test group has almost same effectness compared with control group in improvement of the activity of daily living of poststroke-hemiplegic patients.