Accuracy of cardiac output measurements during off-pump coronary artery bypass grafting: according to the vessel anastomosis sites

Sung Yong Park,Dae Hee Kim,Han Bum Joe,Ji Young Yoo,Jin Soo Kim,Min Kang,Yong Woo Hong 대한마취통증의학회 2012 Korean Journal of Anesthesiology Vol.62 No.5

Background: During beating heart surgery, the accuracy of cardiac output (CO) measurement techniques may be influenced by several factors. This study was conducted to analyze the clinical agreement among stat CO mode (SCO), continuous CO mode (CCO), arterial pressure waveform-based CO estimation (APCO), and transesophageal Doppler ultrasound technique (UCCO) according to the vessel anastomosis sites. Methods: This study was prospectively performed in 25 patients who would be undergoing elective OPCAB. Hemodynamic variables were recorded at the following time points: during left anterior descending (LAD) anastomosis at 1 min and 5 min; during obtuse marginal (OM) anastomosis at 1 min and 5 min: and during right coronary artery (RCA) anastomosis at 1 min and 5 min. The variables measured including the SCO, CCO, APCO, and UCCO. Results: CO measurement techniques showed different correlations according to vessel anastomosis site. However, the percent error observed was higher than the value of 30% postulated by the criteria of Critchley and Critchley during all study periods for all CO measurement techniques. Conclusions: In the beating heart procedure, SCO, CCO and APCO showed different correlations according to the vessel anastomosis sites and did not agree with UCCO. CO values from the various measurement techniques should be interpreted with caution during OPCAB. Background: During beating heart surgery, the accuracy of cardiac output (CO) measurement techniques may be influenced by several factors. This study was conducted to analyze the clinical agreement among stat CO mode (SCO), continuous CO mode (CCO), arterial pressure waveform-based CO estimation (APCO), and transesophageal Doppler ultrasound technique (UCCO) according to the vessel anastomosis sites. Methods: This study was prospectively performed in 25 patients who would be undergoing elective OPCAB. Hemodynamic variables were recorded at the following time points: during left anterior descending (LAD) anastomosis at 1 min and 5 min; during obtuse marginal (OM) anastomosis at 1 min and 5 min: and during right coronary artery (RCA) anastomosis at 1 min and 5 min. The variables measured including the SCO, CCO, APCO, and UCCO. Results: CO measurement techniques showed different correlations according to vessel anastomosis site. However, the percent error observed was higher than the value of 30% postulated by the criteria of Critchley and Critchley during all study periods for all CO measurement techniques. Conclusions: In the beating heart procedure, SCO, CCO and APCO showed different correlations according to the vessel anastomosis sites and did not agree with UCCO. CO values from the various measurement techniques should be interpreted with caution during OPCAB.

습기제거시스템의 성능에 관한 연구

유성연,정민호,홍정표,심국진,김광영 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2

The performance of moisture removal system is investigated analytically and experimentally. The program for the moist air calculation and for the condensing tube design are developed to examine the factors which affect moisture removal rate. Experimental apparatus comprises condensing tube, cooling system, vacuum pump, measurement and control devices. Thermoelectric cooling system and vapor compression refrigeration system are used to cool the air, and the performance of two systems are compared each other. Thermoelectric cooling system is compact and free from noise and vibration, but cooling rate of it is relatively slow compared to that of vapor compression refrigeration system. Air velocity, indoor temperature and humidity, temperature of coolant, size and material of condensing tube are found to affect the performance of moisture removal.

마이크로 어셈블리용 6자유도 정렬기의 기구학적 분석 및 디자인

유용환,이문구,이수훈,홍민성,송준엽,이창우 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

This work will develop a 6-DOF precision aligner with small size and high resolution for assembling the micro parts for a mobile electronics. Here, Tiny PicomotorTM actuator that is small and reliable will be applied to this aligner system. The principle of this actuator is PZT that turns a precision thread and then the screw moves linearly. Arrangement of actuators will be a symmetrical based on kinematic design. This paper presents combining two modules of mechanism for the 6-DOF precision aligner. The first is a stage which can control XYθz motion, and the second can control Z motion, in other words, Z tilt motion. According to its specifications, it is expected to satisfy requirement of precision.

한국 성인을 대상으로 한 전산화 Standard Progressive Matrices의 표준화 예비연구

홍경수,이민수,오병훈,하규섭,유한익,이창욱,연병길,김성윤,신민섭,김재진,권준수 大韓神經精神醫學會 1999 신경정신의학 Vol.38 No.5

연구목적 : 전산화 Standard Progressive Matrices(SPM) 검사의 한국인 성인 표준자료를 확립함으로써, 간이로 지능을 평가하는 경우에도 보다 정확하게 지능지수를 추정하기 위해서 본 연구를 수행하였다. 방 법 : 18세 이상의 남녀 정상인 자원자 353명을 대상으로 전산화 SPM 검사를 시행하고, 백분율 및 표준점수(T-점수)를 기준으로 하여 표준화 자료를 작성하였다. 전체 대상군을 성별, 연령별로 구분한 후 평균과·분포가 유사한 집단은 군을 합치는 방법을 사용하였다. 한국인 표준자료에 근거하여 추정한 SPM 지능지수와 외국인 표준자료에 근거하여 추정한 SPM 지능지수를 각각 KWAIS 지능지수와 비교함으로써 타당도를 검증하였다. 결 과 : 18∼30세, 31∼40세, 41∼50세, 51세 이상의 연령군으로 구분된 한국 정상 성인의 SPM 표준화 자료를 산출하였다. 본 연구 결과에 의한 표준화 자료를 적용하여 지능지수를 추정하는 것이 현재 사용하고 있는 외국인의 표준화 자료를 이용하는 것보다 KWAIS 지능지수에 더욱 근접한 결과를 보였다. 결 론 : 18세에서 50세까지의 한국인 남녀에게는 간이지능평가도구로서 전산화 SPM 검사의 한국인 표준화 자료를 유용하고 타당하게 적용할 수 있음을 확인하였다. Objectives : We conducted this study to provide standardized data of the computerized Standard Progressive Matrices(SPM) test in Korean adults. Methods : The computerized SPM test was administered to 353 healthy volunteers aged 18 years over. We provided the standardized data(percentile and standardized T-scores) for the groups with similar mean and distribution of SPM scores, which was originally divided by age and sex. The validity of the new standardized data was tested by comparing IQs estimated by SPM and K-WAIS. Results : The standardized SPM data were provided for four age groups : 18 to 30 years, 31 to 40 years, 41 to 50 years, 51 years and over. IQ estimated by this standardized data tends to be closer to IQ by K-WAIS than the IQ estimated by foreign normative data. Conclusion : The standardized data of the computerized SPM were proven to be a useful and valid tool for measuring IQ briefly, compared with the conventional way of measuring IQ.

한국의 C형간염바이러스 RNA 양성인 간질환자 및 건강 공혈자에서의 C형간염바이러스 유전자형의 분포양상

이진경,홍석일,황유성,이선호,민원기,성영철,이동순 대한임상병리학회 1996 대한임상병리학회지 Vol.16 No.4

물표면 방전을 이용한 클로로포름의 분해

유승민 ( Seung Min Ryu ),유승열 ( Seung Ryul Yoo ),박준석 ( Jun Seuk Park ),홍은정 ( Eun Jung Hong ),노태협 ( Tai Hyeop Lho ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.5

Chloroform is harmful volatile organics and representatives of Trihalomethane (THM). Well-known removal methods of Chloroform are photo oxidation or OH radical oxidation. Plasma on water surface at slightly vacuum condition (45 torr) can produce OH radical and it will help chloroform removal. 81.5% of chloroform is removed by vacuum and plasma in 10 min. Plasma can totally oxidize it till 2.8% and partially oxidize chloroform up to 18.5%. Water-surface plasma is good method to remove chloroform in short time.

다량의 하부위장관출혈이 병발된 Vibrio vulnificus 패혈증 1예

최주연,유진홍,한석원,이대훈,최민호,박순민,김연식,김선우,신완식,강문원,강성구 대한화학요법학회 1996 대한화학요법학회지 Vol.14 No.2

최근 저자들은 Vibrio vulnificus 감염에 의해 패혈증 및 이차성 피부 병변을 보인 42세의 남자 환자의 치료중 하부 위장관 출혈이 병발된 1예를 경험하였기에 보고하는 바이다. We experienced a case of Vibrop vulnificus septicemia which showed an unusual manifestation such as hematochezia. The patient was a 42-year-old man with chronic liver disease. The blood and wound culture revealed the organism. During intensive care, he suffered from massive hematochezi for several days. Colonoscopy and abdominal CT showed findings suspicious of ischemic colitis. To our knowledge, this is the first unusual case of V.vulnificus infection which showed massive lower gastrointestinal bleeding.

부모 기록용 아동 행동 조사표에 의한 초등학교 어린이들의 정서와 행동문제 연구

여순,홍유라,박재선,이용환,김민향 고신대학교의과대학 2007 고신대학교 의과대학 학술지 Vol.22 No.2

목적: 외견상 정상으로 간주되는 일정 지역사회 어린이들을 대상으로 문제성 정서․행동의 빈도를 알아보고, 이들 정서․행동 문제의 빈도와 사회경제적 요인들과의 관계를 알아보고자 하였다. 방법: 부산광역시의 일개 초등학교 1, 3, 5학년 어린이 700명을 대상으로 아동 행동 증상 목록표(Pediatric Symptom Checklist, PSC)로 된 설문지를 배부하였다. 설문지에는 50 항목의 행동 증상을 짧게 적고 부모가 각각의 행동 빈도에 “전혀 아님”, “가끔”및 “자주” 중 하나를 표시하도록 하였고, 아동의 건강상태, 부모 자녀간의 대화방식, 부모의 수입과 교육수준도 함께 조사하였다. 또한 일부 항목에 대해 원하는 경우, 담임선생님에 의해 이중으로 기록하게 하였다. 회수된 설문지 609매를 대상으로 빈도가 “전혀 아님”은 0, “가끔”은 1점, “자주”는 2점을 부과해 합산한 뒤 분석하였다. 결과: 피검아동 609명이 50개 문항의 행동들에서 “가끔” 또는 “자주”에 응답한 예의 빈도는 0.9-65.3%의 분포를 보였으며, 응답률에서 5%미만이 4개, 5-20%가 15개, 21-50%가 27개, 51%이상이 4개 문항이었고, 문제행동 총점들의 평균은 14.03(범위 0-43, 표준편차 8.96)점이었다. 빈도가 50%이상이었던 행동들은 “잘 울고 화내고 짜는 소리하기(총 65.2%, 남 62.75%, 여 67.9%)”, “부끄럼을 타고 남 앞에 나서기 두려움(총 60.9%, 남60.0%, 여 61.8%)”, “머리, 배, 다리가 자주 아프다(총55.8%, 남 53.1%, 여 58.8%)”, “집중하기 힘들다(총53.0% 남 55.5%, 여 50.4%)”의 4문항이었다. 성별 비교에서, 여아는 “새롭고 낯선 환경에서 겁이 많고 적응하기 힘들다”, “아무도 자신을 좋아하지 않아 희망이 없다고 느낀다”라는 두 문항에서만 남아에 비해 빈도가 높았으며(P<0.05), 문제 행동 유형별 비교시 주의산만 유 형, 공격성 유형은 남아에서, 불안은 여아에서 유의하게 높았다. 그러나 문제 행동 총점의 평균은 남녀 각각 14.44, 13.60로 유의한 차이가 없었다. 건강한 피검자 군의 총점 평균은 13.64로 이상이 있는 군의 17.29와 유의한 차이를 보였다(P=0.007). 건강한 친부모와 생활하는 피검자 군에서의 총점 평균은 13.68로 그 외 군에서의 15.92와 유의한 차이를 보였다(P=0.025). 부모자녀간의 대화방식에서 비효율적인 방법을 많이 사용하는 경우(4점이상군), 문제 행동의 총점이 16.77로서 3점 이하군의 9.48과 현저한 차이를 보였다(P<0.001). 결론: 조사 대상 어린이들의 과반수 이상은 잘 울고, 부끄러워 남앞에 나서길 두려워하며, 신체 통증을 자주 호소하고, 주의산만하다는 정서․행동의 특성을 가지고 있었다. 전체 문제 행동들의 빈도에 영향을 주는 인자로는 어린이의 외관상 건강상태, 가족 구성원의 구조, 부모의 대화습관이었고 부모의 경제력이나 학력과는 유의한 상관관계가 없었다. 문제성 정서․행동의 빈도에 가장 강력한 변인은 부모의 효율적 대화능력으로 생각되었다. Background : This study was conducted to identify the types and prevalence of emotional and behavioral problems in primary school children based on a Pediatric Symptom Checklist (PSC) which was filled out by parents. Methods : The subjects were 609 children between the age of 7 to 11 in one primary school in Busan, Korea. The PSC containing 50 behavior items were initially rated by parents and checked again by teachers in 17 items for the children whose parent consented to review. The PSC is scored by assigning 0 for never, 1 point for sometimes, and 2 point for often, and then adds the points for overall score. Parental attitudes of communication with their children were also assessed by scoring of parental responses to the questionnaire. Comparison of total behavior scores and other factors including parental competency scores were also made. Results : In each items of 50 behavioral problems, the frequency which is comprised of often true and sometimes true were widely distributed from 0.9% to 65.3%. The most common problem behavior was "crying easily and become angry"(often+sometimes: 65.2%) The next common problem behaviors were "shyness and being afraid of strange people"(60.9%), "complains of bodily aches or pains"(55.8%), "has trouble in concentrating"(53.0%), "be afraid of new situation with uneasiness"(44.5%), and "prefers to spends more time alone indoors"(43.3%) in descending order of frequency. In sexual comparison of frequency of problem behaviors, girls had significantly high frequency in two items-"be afraid of new situation with uneasiness"(P=0.018) and "no one likes him or her and has no hope" (P=0.029). On classifying 50 items into 8 behavior patterns, boys revealed higher frequencies in the behavior of inattention, impulsivity, hyperactivity and anger, aggression, antisocial activity, while girls revealed higher frequencies in the behavior of anxiety. The mean total problem scores were significantly lower in the children of healthy group (healthy 13.64 vs unhealthy 17.29, P=0.007), living with healthy biological parents (biological 13.68 vs others 15.92, P=0.025) and parents who were using less destructive communication (barrier score≤3 9.48 vs barrier score≥4 16.77, P<0.001). There was no significant correlation between the mean total problem scores and variables such as sex, grade, incomes, and educational career of mother. Conclusions : Crying easily, shyness, bodily aches, difficulty in concentrating, being afraid of new situation with uneasiness, and loneliness were commonly prevalent behaviors in the children of the primary school studied. Total problem scores were significantly higher in children with physical handicaps, children living without both biological parents, and most remarkably in children who were cared by parents with poor communication skills

Escherichia coli 패혈증 환자에 합병된 대칭적 하지 말단 괴사증 1예

남해성,유진홍,권순석,민준기,조현선,박민경,심병주,남유정,이지인,김진수,길욱현,조근종,신완식 대한감염학회 2005 감염과 화학요법 Vol.37 No.6

We have encountered a rare case of symmetrical peripheral gangrene complicating Escherichia coli sepsis in a 47-years-old male. He was successfully treated with antibiotics, anticoagulants, and vasodilator. To our knowledge, this is the first report on symmetrical peripheral gangrene complicating E. coli sepsis in Korea.

Flavobacterium meningosepticum에 의한 균혈증 1예

장성원,유진홍,진승원,김선우,김연식,박순민,이대훈,최민호,최주연,신완식,강문원,강지민 대한화학요법학회 1997 대한화학요법학회지 Vol.15 No.1

1996년 6월 카톨릭대학교 부천성가병원에 뇌경색으로 입원했던 61세 남자 환자의 혈액에서 Flavobacterium meningosepticum을 분리하였다. 환자는 폐렴을 동반한 패혈증의 예로 ceftriaxone과 metronidazole을 투여하였으나 입원 48시간만에 사망하였다. Flabovacterium meningosepticum is a rae cause of nosocomial infection which shows multi-drug resistance. It mainly invades patients with impaired immunity. Recently, we experienced a case of F. meningosepticum bacteremia in a patient with chronic debilitated state owing to stroke. The clinical progress was so rapid that he died within 48 hours. Blood culture revealed F. meningosepticum which showed characteristic yellow colony in blood agar plate.