생쥐 대장 평활근 세포에서 내향 정류성 칼륨 전류의 특성 연구

이은주,김명,정명섭,조향훈,김기훈,하현철,김준수,최석,전제열 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2

Objectives: K^(+) channels play an important role in regulating cellular excitability. The aim of this study was to know whether or not inward rectifier K^(+) channel exists in colonic smooth muscle cells. Methods: Mouse colonic smooth muscle cells were isolated using collagenase, and then we recorded their membrane currents using a whole-cell patch clamp technique. Results: With 90 mM K^(+) in bath, hyperpolarization-induced inward currents from -120 mV to 20 mV with 400 ms duration at a holding potential of -10 mV showed rapid activation, inactivation and inward rectification. The inactivation showed single exponential time course. Reduction of external K^(+) to 60 mM decreased the amplitudes of the currents in whole test voltage range and shifted the reversal potential to more negative potential. The inactivation process and peak currents of hyperpolarization-induced inward currents were not affected by removing external Na^(+). External Ba^(+) blocked hyperpolarization-induced inward currents by dose-dependent manner and pure Ba^(+)-sensitive currents showed strong inward rectification. Cs^(+) also suppressed hyper- polarization-induced inward currents. Ba^(+) and Cs^(+)-induced inhibitiOn of hyperpolarization-induced inward currents was voltage-dependent, and the extent of inhibition increasing with membrane hyperpolarization. Conclusions: These results suggest that inward rectifier KU channels may exist in proximal colonic smooth muscle and may play an important role in regulating membrane potential.

갑상선 기능항진증에 병발된 주기성 마비 3예

최지훈,최경숙,김기훈,박병현,조정구 圓光大學校 醫科學硏究所 2001 圓光醫科學 Vol.16 No.1-2

Thyrotoxic periodic paralysis is characterized by intermittent flaccid paralysis of skeletal muscle, lasting several hours. The underlying pathophysiology of the syndrome is not yet to be well characterized and remains controversal, but reflects altered potassium and calcium dynamics as well as certain morphologic characteristics within the muscle unit itself. It occurs primarily in Asian populations with an overwhelming male preponderance and a higher association of specific HLA antigens. Precipitating factors include high carbohydrate ingestion, exercise, trauma, infection, alcohol ingestion, administration of epinephrine, thyroid hormone, or corticosteroid. If hypokalemia is present, potassium administration may help abort the attack, but the only definitive treatment is formation of euthyroid state. We discribed two patients with hypokalemic thyrotoxic periodic paralysis and one patient with normokalemic thyrotoxic periodic paralysis.

승용 디젤엔진용 가변과급기 성능에 관한 연구

진영욱,정진은,조훈기,강우,정재우 한국기술교육대학교 2006 論文集 Vol.13 No.1

A test bench which is consisted of roots blower, air flow meter, driving unit for VGT actuator, transmitters for temperature and pressure, and the rotational speed sensor was developed to evaluate the characteristics of the VGT system. Measurements using VGT of the 2.0 L diesel engine were carried out. The corrected mass flow rate and the pressure ratio for the compressor of the VGT are related directly with the rotational speed, but they are independent of the rack position of the VGT. The pressure ratio and the corrected mass flow rate of the turbine of the VGT are related directly with the rack position of the VGT, but they don't have any relation with the rotational speed. The mechanical efficiency of the VGT is higher than the conventional turbocharger in the wide range. The efficiency at the 0.03 kg/s of the mass flow rate is 4.36 times as high as that of the conventional turbocharger. These data will be used to develop the new engine equipped with the VGT system.

효소면역검사법을 이용한 결핵 진단법의 유용성 평가

김은영,남정현,조병원,김은경,이종욱,배수환 대한임상검사정도관리학회 1999 臨床檢査와 精度管理 Vol.21 No.1

Glucocorticosteroid가 흉선 세포의 아형 및 핵산에 미치는 영향

문성록,이시은,장선일,조성경,정헌택 최신의학사 1991 最新醫學 Vol.34 No.1

2-Deoxy-D-Glucose에 의한 대사성 쇼크가 무우스의 면역 반응에 미치는 영향

김양숙,장선일,박래길,조성경,정헌택 최신의학사 1991 最新醫學 Vol.34 No.2

미소결함의 형상인식을 위한 디지털 신호처리 적용에 관한 연구

김재열,홍석주,이규태,김병현,김훈조,김양중 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.1

In this study, the classified researches the artificial and natural flaws in welding pails are performed using the pattern recognition technology. For this purpose the signal pattern recognition package including the user defined function was developed and the total procedure including the digital signal processing, feature extraction, feature selection and classifi-er selection is treated by bulk. Specially it is composed with and discussed using the statistical classifier such as the linear discriminant function the empirical Bayesian classifier. Also, the pattern recognition technology is applied to classifica-tion problem of natural flaw(i.e multiple classification problem - crack, lack of penetration, lack of fusion, porosity, and slag inclusion, the planar and volumetric flaw classification problem). According to this results, it is possible to acquire the recognition rate of 83% above even through it is different a little according to domain extracting the feature and the classifier.

신생아 말초혈액 T 림프구의 아형 분석

최두영,김종덕,장선일,이신은,조성경,정헌택 최신의학사 1990 最新醫學 Vol.33 No.12

임신 오조증이 합병된 임신에서의 출생아의 성비에 관한 연구

조헌영 ( Hun Young Cho ),이정열 ( Jung Ryul Lee ),이유경 ( Yoo Kyong Lee ),구인상 ( In Sang Ku ),차진영 ( Jin Young Cha ),김승룡 ( Seung Ryong Kim ),박문일 ( Moon Il Park ),조삼현 ( Sam Hyun Cho ),정성로 ( Sung Ro Chung ),황윤영 ( 대한주산의학회 2002 Perinatology Vol.13 No.2

연구목적:임신 오조증이 합병된 임신부의 경우, 출생시 신생아의 성비가 정상산모의 그것과 차이를 보인다는 일부 보고가 있어, 본 연구에서는 임신 오조증과 출생 신생아의 성비와의 관련성 여부와 오조증의 정도에 따른 출생시 성비에 대해 조사를 시행하였다. 방법:1995년 1월부터 2000년 12월까지 한양대학병원 산부인과에서 임신 오조증으로 진단받고 입원 치료한 산모 중, 본원에서 최종 분만한 111명의 산모를 연구 대상으로 하고, 상기 질환력이 없이 만삭 분만한 1995명을 대조군으로 하여, 각 군의 신생아의 성비를 비교 하였다. 또한 임신 오조군을 그 정도에 따라 경증과 중증의 두 군으로 나누어, 각 군별 특성과 출생시의 성비에 대해 조사하였다. 자료의 통계적 처리는 student t-test와 chi-square test를 이용하였고 p-value가 0.05 이하인 경우에 임상적 의의가 있는 것으로 판단하였다. 결과:임신 오조군의 경우, 111명의 출생아의 성별은 65명이 여아(58.6%), 46명이 남아(41.4%)로서, 대조군에 비해 여아의 출생이 유의하게 높은 것으로 나타났다(p=0.0046). 한편 임신 오조증의경증군과 중증군 사이에서는 성비에서 유의한 차이를 보이지 않았다(p=0.4487). 결론:임신 오조증이 합병된 임신에서는 여아의 출생이 유의하게 많은 것으로 조사되었다. 한편, 임신 오조증과 여아 출생의 증가와의 관련 인자를 규명하기 위하여는 혈중 에스트로젠 또는 HCG 농도 등에 관한 조사를 시행할 필요가 있는 것으로 사료된다. Objectives:There are a few studies reporting difference in sex ratio at birth in pregnancies complicated with hyperemesis gravidarum but it has not been reported in domestic journals yet. The purpose of this study is to evaluate difference of sex ratio in hyperemesis gravidarum patients compared to normal pregnant women. Materials & Methods:We identified 111 women who were diagnosed as hyperemesis gravidarum and had delivered babies in Hanyang University Hospital between Jan. 1995 to Dec. 2000. The control group was 1995 women who had no obstetric problems including hyperemesis gravidarum during the pregnancy and had delivered baby at term. We compared the sex ratio of infant and the characteristics of these two groups. The study group was divided into two subgroups depending on the severity of disease, mild group and severe group, and difference of sex ratio in these group were also compared. We analyzed the data using student T-test and chi-square test and p-value<0.05 was considered as statistically significant. Results:Compared to sex ratio(female:male) of control group(44.8:55.2), hyperemesis gravidarum showed the sex ratio of 58.6:41.4(p=0.005). There was no further difference of sex ratio between two subgroups of hyperemesis gravidarum according to severity of disease. Conclusion:In pregnancies complicated with hyperemesis gravidarum the sex ratio of female was significantly high. The studies based on more variables and larger population would produce more accurate results.

정신분열병에 대한 리스페리돈의 효과 및 안정성

이민수,김용구,김영훈,연병길,오병훈,윤도준,윤진상,이철,정희연,강병조,김광수,김동언,김명정,김상훈,김희철,나철,노승호,민경준,박기창,박두병,백기청,백인호,손봉기,손진욱,양병환,양창국,우행원,이정호,이종범,이홍식,임기영,전태연,정영조,정영철,정인과,정인원,지익성,채정호,한상익,한선호,한진희,서광윤 大韓神經精神醫學會 1998 신경정신의학 Vol.37 No.1

연구목적 : 본 시험의 목적은 임상시험 시작전에 연구자들을 대상으로 PANSS Workshop을 통하여 PANSS, ESRS에 대한 국내에서의 표준화 작업을 구축하고 새로운 정신병 치료제인 리스페리돈의 효과와 안정성을 재확인하여 리스페리돈 사용에 대한 적정화를 이루는데 있다. 연구방법 : 1996년 4월부터 1996년 9월까지 국내 39개 대학병원 정신과에 입원중인 혹은 증상이 악화되어 입원하는 정신분열병 환자 377명을 대상으로 다시설 개방 연구를 시행하였다. 1주일간의 약물 배설기간을 가진후, 리스페리돈을 8주간 투여하였고, 기준점, 1주, 2주, 4주, 그리고 8주후에 평가되었다. 용량은 제1일에는 리스페리돈 1mg씩 1일 2회, 제2일에는 2mg씩 1일 2회, 제3∼7일에는 3mg씩 1일 2회 투여하였다. 이후 환자의 임상상태에 따라 임의로 증량할 수 있으며, 최대 일일 16mg을 초과하지 않도록 하였다. 추체외로 증상을 조절하기 위한 투약을 허용하였다. 임상증상 및 부작용의 평가는 PANSS(Positive and Negative Syndrome Scale), CGI(Clinical Global Impression) 그리고 ESRS(Extrapyramidal Symptom Rating Scale)을 사용하였다. 연구결과 : 377명중 343명(91%)이 8주간의 연구를 완결하였다. 치료 종결시점인 8주후 PANSS 총점수가 20% 이상 호전된 경우를 약물 반응군으로 정의할때, 약물반응군은 81.3%였다. 리스페리돈에 반응하는 예측인자로는 발병연령, 이전의 입원 횟수, 유병기간이 관련 있었다. 리스페리돈은 1주후부터 PANSS양성, 음성, 및 일반정신병리 점수상에 유의한 호전을 보여 효과가 빨랐다. CGI의 경우도 기준점에 비해 1주후부터 유의한 감소를 나타내었다. ESRS의 경우, 파킨슨 평가점수는 기준점과 비교해 투여 1주, 2주, 4주후 유의하게 증가되었다가 8주후 기준점과 차이가 없었다. Dystonia 평가점수는 1주후만 유의한 증가를 보였으며, dyskinesia 평가점수는 유의한 차이가 없었다. 혈압, 맥박수의 생명징후 및 일반 혈액학 검사, 생화학적 검사, 심전도 검사에서 유의한 변화는 없었다. 결 론 : 이상의 다시설 개방 임상 연구를 통해 리스페리돈은 정신분열병 환자에서 양성증상뿐만 아니라 음성증상 및 전반적인 증상에도 효과적인 것으로 사료된다. 보다 명확한 평가를 위해서는 다른 항정신병약물과의 이중맹검 연구가 필요할 것으로 생각되며, 또한 장기적 치료에 대한 평가도 함께 이루어져야 하겠다. Objective : The purpose of this study was to investigate the efficacy and safety of risperidone in the treatment of Korean schizophrenic patients. Method : This multicenter open study included 377 schizophrenic patients drawn from 39 university hospitals. After a wash-out period of 1 week, the schizophrenic patients were treated with risperidone for 8 weeks and evaluated at 5 points ; at baseline, and 1, 2, 4 and 8 weeks of treatment. The dose was increased from 2mg/day(1mg twice daily) to 6mg/day(3mg twice daily) during the first week and adjusted to a maximum of 16mg/day over the next 7 weeks according to the patient's clinical response. Medication to control extrapyramidal symptoms was permitted. The psychiatric and neurological status of the patients was assessed by PANSS, CGI, and ESRS scales. Results : 343(91%) of 377 patients completed the 8-week trial period. Clinical improvement, as defined by a 20% or more reduction in total PANSS score at end point, was shown by 81.3% of patients. The predictors of response to risperidone were associated older age, shorter duration of illness, fewer previous hospitalization. Risperidone had rapid onset of action ; a significant decrease of the total PANSS and three PANSS factor(positive, negative, general), and CGI was already noticed at the end of first week. For the ESRS, parkinsonism rating scores were significantly increased until week 4 comparing with baseline. Dystonia rating scores were significantly increased until week 1, and dyskinesia rating scores were not significantly changed during the study. Laboratory parameters including vital sign, EKG, hematological, and biochemical values showed no significant changes during the trial. Conclusions : This study suggests that risperidone is generally safe and effective against both the positive and negative symptoms in our group of patients.