골부초와 자갈대에 의한 고랭지 감자재배지 토양보전 효과

박철수,정영상,주진호,이원정,양재의 한국환경농학회 2005 한국환경농학회지 Vol.24 No.1

강원도 고령지 지역의 밭은 경사지에 발달한 곳이 많아서 강우에 의한 유거수와 토양의 유실이 많이 일어나게 된다. 일부 지역에서는 석비레를 이용하여 농업을 하고 있어 강우침식을 쉽게 받을 수 있다. 이러한 농경지 밭에 쉽게 적용하여 토양유실을 저감시킬 수 있도록 하기 위해 농경지 인근에서 쉽게 구할 수 있는 잡초와 토양침식 후 표면에 남은 자갈을 이용하여 골에 일정 간격으로 두어 그 효과를 살펴보았다. 토양 유실량은 식양토이면서 13%의 경사를 가진 포장에서는 사경과 등고선 경작만으로도 토양 유실량을 현저히 줄일 수 있는 것으로 나타났고, 경사가 23%,인 석비레 사양토 포장에서는 토양 유실이 심하게 발생하는 것으로 나타났다. 부초와 자갈을 최소로 이용하는 골최소부초와 골자갈대를 시험구에 처리함으로써 처리하지 않은 구에 비해 횡계와 용산 포장에서 45% 이상의 토양 유실 저감 효과와 유거수 발생 또한 저감시킬 수 있는 것으로 나타났으나, 사양토인 석비레 성토 지역의 경우는 토양 유실량이 보전처리구에서 61 Mg/ha 이상이 발생하여 골최소부초와 골자갈대를 3 m 간격으로 처리 하여서는 그 효과를 허용 토양 유실량인 11 Mg/ha 이하로 낮출 수 없는 것으로 평가되어 단일한 방법으로는 토양보전에 부족할 것으로 평가되었다. To develop proper soil management practices for reducing soil erosion, experiments were carried out by using lysimeters in Pyeongchang highland, Korea. Lysimeters installed at Hoenggye had 13% slope, 15 m slope length and 3 m width. Lysimeters with 23% slope, 15 m slope length and 5 m width were also installed at Yongsan. Soil textures in Hoenggye and Yongsan lysimeter plots were silty clay loam and sandy loam, respectively. In the lysimeters potato was cultivated, and slant furrow culture and contour culture were applied. Up-down furrow and continuous fallow lysimeter was included in the experiments as a control plot. For the slant furrow and contour culture methods, minimum furrow mulching and gravel barrier were placed at each end of the furrows in the lysimeters from April to October in 2000 and 2001 to prevent soil and nutrient losses. In Heonggye, in two years experiments, average soil loss of 17 Mg/ha was found in the up-down and continuous fallow lysimeter and 2.6 Mg/ha from furrow minimum straw and slant furrow treatment, and 1.8 Mg/ha from slant furrow and gravel bag treatment. In the contour culture, the soil losses were further reduced. In Yongsan, soil loss in the slant furrow culture without any protection treatment was 167 Mg/ha, and the soil loss was reduce to 61 and 86 Mg/ha with minimum straw and gravel bag treatments, respectively. The soil loss could be reduced more than 45% by furrow minimum straw and gravel barrier. The furrow minimum straw or gravel bag barrier successfully reduced soil loss in clay loam soil in Heonggye, but still the treatments were not enough to reduce soil loss in saprolite piled sandy loam soil in Yongsan.

통신용 정류기 시스템의 모델링 및 제어기 설계

신병철,송의호,양재석 國立 昌原大學校 産業技術硏究所 1999 産技硏論文集 Vol.13 No.-

This paper deals with the design of controller which is used to rectifier for communication. Mathematical small-signal modeling and characteristic analysis are performed about DC/DC converter and three-phase AC/DC converter. Bode plots are obtained by the mathematical small-signal modeling. By the PSpice simulation, performance of the controller is proved respectively in line regulation and load.

산지유통센터(APC) 운영관리 프로그램을 이용한 정보화경영 방안

이호철,박재홍 한국농업정보과학회 2001 농업정보과학 Vol.3 No.1

이 연구는 산지유통센터의 경영에 있어 새로운 운영프로그램을 도입함으로써 경영의 정보화를 통하여 탄력적으로 기존의 패킹하우스 시설을 재활용할 수 있는 방안을 강구하고자 하였다. 산지유통센터의 운영을 전산화를 통하여 효율적으로 관리함으로써 산지유통센터의 수익성을 정확히 진단하고 이를 경영개선에 활용하고자 하는 것이다. 전산화된 산지유통센터 운영관리프로그램의 도입은 산지유통센터에게 그 운영에 필요한 경영정보를 신속?명확하게 제공함으로써 산지유통센터의 경영합리화에 기여할 것이며 산지유통센터의 과학적 경영전략의 수립 등으로 산지유통센터의 기능이 크게 강화될 것이다. 이는 결과적으로 그 동안 미약했던 패킹하우스 경영진의 효율적 경영노하우의 집적은 물론 정보화된 패킹하우스 운영을 가져올 것이다. 아울러 활용도와 권한이 증대된 패킹하우스는 생산자들의 집단적이고 효율적인 단합을 유도하여 시장에서의 거래교섭력을 강화하게 될 것이다. 이처럼 현행의 한계를 극복하고 새로운 지역농업의 발전을 도모하기 위해서라도 새로운 산지유통센터 운영관리 프로그램의 개발 및 도입은 이제 서둘러야만 할 것이다.

만성폐쇄성폐질환의 중증도와 폐고혈압 및 폐성심으로 진행과의 상관관계

김형호,박철진,이준,장광표,하성일,이재록,하재화,권세훈,권용운,윤성호,이승일 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.2

Background: From many previous studies, Pulmonary hypertension is the known independent predictive factor of the mortality in COPD. Also pulmonary hypertension is the major cardiovascular complication of COPD and is associated with the progression to cor pulmonale and poor prognosis. Author want to analyze the correlation between pulmonary hypertension and the severity of COPD which are classified by forced expiratory volume in one second, and the extent of progression to corpulmonale. Methods: Retrospectively we investigated the medical records of 118 patients with COPD who had pulmonary function test and echocardiogaphy more than one times during one-year follow-up (from June, 2005 to May, 2006) at respiratory division in chosun university hospital, and then 50 patients were enrolled in this study. We classified the severity from FEVl in pulmonary function test based on the GOLD guideline, also this was comparably analyzed with RVSP, RVIDd, Visual Grading from echocardiography. Results: 16 patients out of 50 were classified as moderate severity, 25 patients were severe, and 9 patients were very severe group. RVSP was higher in more severe groups than less severe groups but when it comes to pulmonary hypertension that RVSP is over 35 mmHg, there was no valid difference lies in those groups. As FEVl decreases RVSP and RVIDd increases, and observed relationship between RVSP which was classified as below 35 mm and above 35 mm groups and visual grading which was classified as normal and dilatated groups revealed valid correlation, Conclusion: As pulmonary function decreases, progression to pulmonary hypertension and cor pulmonale increases but there was no remarkable difference of prevalence in above moderate severity groups. 연구배경 폐고혈압은 이전의 많은 연구에서 만성폐쇄성폐질환에서 독립적인 사망의 예측인자로 알려져 있다. 또한 폐고혈압은 만성폐쇄성폐질환의 주요한 심혈관계 합병증이며, 폐성심으로의 진행 및 불량한 예후와도 관련되어 있다. 이에 저자는 폐고혈압과 1초간 노력성호기량으로 분류되는 만성폐쇄성폐질환의 중증도 및 폐성심으로의 진행 정도를 비교 분석하여 이들의 상관관계를 밝혀보고자 한다. 방법 2005년 6월부터 2006년 5월까지 1년 동안 본 병원 호흡기 내과에서 폐기능검사와 심장초음파 검사를 각각 1회 이상 시행한 적이 있는 118명에 한하여 의무기록을 후향적으로 조사하여 이 중에서 50명을 대상으로 하였다. 폐기능검사 시행 결과 얻은 1초간 노력성호기량을 바탕으로 GOLD guideline에 따라 중증도를 분류하였으며 이를 심초음파 시행 결과 얻은 우심실수축기압, 확장기말 우심실내부간격, 시각등급과 비교분석하였다. 결과 대상 환자 50명중 16명은 중등증, 25명은 중증, 9명은 최고중증 그룹으로 분류되었다. 우심실수축기압은 중증도가 높은 그룹에서 낮은 그룹에 비해 더 높게 나타났으나 폐고혈압에 해당하는 우심실수축기압이 35 mmHg이상인 환자에 있어사는 각 그룹간에 유의한 차이를 보이지 않았으며, 확장기말 우심실내부간격, 시각등급 또한 중증도와 유의한 차이를 보이지 안항ㅆ다. 1초간 노력성호기량이 감소함에 따라서는 우심실수축기압, 시각등급은 증가하였으며 우심실수축기압을 35mmHg 미만과 이상인 그룹으로, 시각등급을 정상과 확장이 있는 그룹으로 분류하여 비교한 결과에서는 유의한 상관관계를 나타냈다. 결론 폐기능이 감소할수록 페고혈압 및 폐성심으로의 진행이 증가하였으나 폐기능검사에서 중등도 이상의 그룹에서 유병률의 차이는 크지 않았다.

感冒辨證에서 희수식 맥진기를 이용한 肺脈觀察의 臨床的 意義

김준명,고재찬,배한호,박양춘,김병탁,김철중 대전대학교 한방병원 2001 惠和醫學 Vol.10 No.1

By useing hisusik-makjingi(희수식맥진기) we analysed lung-pulse of common cold patient. The result as fellow ; 1. In case of wind-cold common cold patient, It is short-avove pulse type and when cold transfer to fever it is dry-cold type pulse. 2. In a case of wind-heat, there is a pulse of above-frequent or frequent-stringed. And also we can find out that in a mild fever case there is not a frequent pulse meaning the heat. 3. In case of vutal energy shortage and yabggi deficiency, we can also notice that the pulse is so powerless. 4. The patient who have had an old complaint and a serious illness didn't show the accordance with the pulse and common cold type.

인간배아의 공동배양 : REVIEW

양회생,이은주,김종호,최석철,심재철 동국대학교 경주대학 1999 東國論集 Vol.18 No.-

One of the contributory causes to poor pregnancy rates in assisted reproduction has been the decreased viability of transferred embryos and the transfer of four-cell embryos into and environment that naturally would be receptive only to 5-day-old blastocysts. In this paper, we have reviewed on the role of helper cells(cocultures) to mimic the in vivo, environment to bring about improved embryo quality and an increased number of blastocysts for replacement in IVF patients. The behavior of helper cell is first presented, followed by their use as cocultures for fertilization and cleavage of embryos. The mode of action and specificity of helper cells are also discussed. The currently available results of pregnancies after cocultures are presented together with future aspects of research that are necessary to refine the coculture system, The ultimate aim is to mimic in vivo conditions in vitro, so that at least the pregnancy rates of assisted conception can be parallel to normal fecundity in the human. Therefore, a very attractive future includes the freezing of blastocysts generated from coculture, thawing, and replacing them in natural cycles.

Serum Procalcitonin for Differential Diagnosis of Acute Exacerbation and Bacterial Pneumonia in Patients With Interstitial Lung Disease

Sim, Jae Kyeom,Oh, Jee Youn,Lee, Eun Joo,Hur, Gyu Young,Lee, Seung Heon,Lee, Sung Yong,Lee, Sang Yeub,Kim, Je Hyeong,Shin, Chol,Shim, Jae Jeong,In, Kwang Ho,Kang, Kyung Ho,Min, Kyung Hoon Elsevier 2016 The American journal of the medical sciences Vol.351 No.5

<P>Background: Acute exacerbation and bacterial pneumonia are major life-threatening conditions in patients with interstitial lung disease (ILD). The rapid recognition of these 2 different conditions is important for their proper treatment. An elevated procalcitonin (PCT) level is commonly detected in patients with bacterial infections. This study assessed the usefulness of the serum PCT level as a biomarker for the differential diagnosis of acute exacerbation and bacterial pneumonia in patients with ILD. Materials and Methods: In this prospective observational study, we enrolled patients with ILD who had experienced recently progressive dyspnea and exhibited new infiltrations on chest radiographs. We classified these patients into an acute exacerbation group and a bacterial pneumonia group and compared their baseline characteristics and laboratory parameters, including the PCT level. Results: Of 21 patients with ILD, 9 patients had bacterial pneumonia. Both the groups showed similar baseline characteristics. The bacterial pneumonia group demonstrated a high PCT level. The PCT level in the acute exacerbation group was significantly lower than that in the bacterial pneumonia group (0.05 versus 0.91ng/mL, respectively; P < 0.001). Other parameters, such as the C-reactive protein level, leukocyte count and body temperature, were also lower in the acute exacerbation group. At a cutoff value of 0.1ng/mL, the sensitivity, specificity and negative predictive values of the serum PCT level were 88.9%, 100.0% and 92.3%, respectively. Conclusions: These findings suggest that the serum PCT level is useful in the differential diagnosis of acute exacerbation and bacterial pneumonia in patients with ILD.</P>

수면 - 무호흡 증후군의 임상적 고찰

이재호(Jae Ho Lee),최동철(Dong Chul Choi),송재훈(Jae Hoon Song),정기석(Ki Suck Jung),김영환(Young Whan Kim),한성구(Sung Koo Han),심영수(Young Soo Shim),김건열(Keun Youl Kim),한용철(Yong Chol Han),정기호(Ki Ho Jeong),정만표(Man Pyo Je 대한내과학회 1991 대한내과학회지 Vol.40 No.4

N/A A clinical evaluation was made in 14 cases of sleepapnea syndrome diagnosed by polysomnography in the Department of Internal Medicine, Seoul National University Hospital during the period from August, 1989 to April, 1990. The results obtained were as follow : 1) The ratio of male to female was 6:1. The age of peak incidence was 6th decade in 35.7%, and 5th decade in 28.6%, 7th and 4th decade in 14.3% respectively in order. 2) The most frequent nocturnal symptom was snoring observed in 14 cases (100%) and apnea during sleep noticed by sleep partner in 13 cases (92.9%). Of daytime symptoms, the most frequent one was daytime sleepiness which was observed in 13 cases (92.9%) followed by morning headache, 6 cases (42.9%). 3) On gross examination, characteristic features of thick, dull appearance with mouth open and plethora on cheek was found only in 5 cases (35.7%). Overweight was observed in 8 cases (57.2%). 4) Hypertension was accompanied in 7 cases (50%) and angina in 2 cases (14.3%). Hypothyroidism and chronic obstructive lung disease were observed in 1 case respectively. 5) 13 cases (92.9%) was obstructive sleep-apnea and 1 case(7.1%) was mixed type but none was central type. 6) On throat examination, palatine tonsilar hypertrophy was found in 10 cases (71.4%), redundant pharyngeal mucosa or redundant soft palate respectively in 6 cases (42.9%). 7) On polysomnographic examination, apnea index of 5~10 and 31~40 were most frequent (4 cases respectively; 28.6%) and apnea index of 41~50 was 3 cases(21.4%). 8) The longest apnea duration of 41~50 seconds was most frequent (4 cases; 28.6%) and apnea duration of 61~70 seconds was next with 3 cases (21.4%). 9) The minimum arerial oxygen saturation of SO~89% was most frequent (7 cases; 50%) and arterial oxygen saturation of 70~79% and 40~49% was 2 cases respectively.

EV Li-Ion 배터리를 위한 배터리 모니터링 IC를 사용한 전하 균일 장치

김철호(Chol-Ho Kim),김문영(Moon-young Kim),김준호(Jun-Ho Kim),문건우(Gun-Woo Moon),임재환(Lim Jae-Hwan),양정환(Yang Jeong-Hwan) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7

본 논문에서는 전기 자동차에 사용되는 리튬 이온 배터리 전하 균일 장치를 제안한다. 제안하는 회로는 배터리 상태 정보를 얻어오는 모니터링 IC를 셀 정보 측정뿐 아니라 전하 균일 회로 제어에도 사용한다. 이러한 구조로 인하여 전하 균일 장치의 제어 및 전하 균일을 위한 배터리 상태 측정 회로가 간단해 지며, 다수의 직렬 연결 배터리에서도 부피가 작고 가격이 저렴한 전하균일 장치를 구현할 수 있다. 본 논문에서는 88개의 리튬 이온 배터리 셀을 위한 제안하는 전하 균일 장치의 구동 방법 및 실험을 보여준다. 이 실험을 통해 제안하는 장치는 간단한 제어 방법을 통해 우수한 전하균일 특성을 나타냄을 증명한다.

정상혈압 폐색전증에서 위험도 평가도구로서의 D-dimer의 역할

윤재철 ( Jae Chol Yoon ),김원영 ( Won Young Kim ),최상식 ( Sang Sik Choi ),정상구 ( Sang Ku Jung ),손창환 ( Chang Hwan Sohn ),김원 ( Won Kim ),임경수 ( Kyoung Soo Lim ),정태오 ( Tae O Jeong ),진영호 ( Young Ho Jin ),이재백 ( Jae 대한결핵 및 호흡기학회 2010 Tuberculosis and Respiratory Diseases Vol.68 No.2

Background: D-dimer testing is widely applied as a first step in the diagnostic work-up of pulmonary embolism (PE). Although this is the most sensitive assay for ruling out PE, the prognostic implications of D-dimer testing in patients with normotensive PE are not well known. The aim of this study was to determine if D-dimer testing on admission predicts major adverse cardiac events (MACE) in patients with normotensive PE. Methods: A total of 180 consecutive patients with normotensive PE admitted between January 2003 and June 2009 were included. The group was divided into quartiles on the basis of their D-dimer levels. We compared the frequency of MACE by quartile of D-dimer level and estimated sensitivity, specificity, and predictive values for MACE in the first and fourth quartile. Results: In the 37 (20.6%) patients with MACEs, the median D-dimer level (7.94 [IQR: 4.03∼18.17] μg/mL) was higher than in patients with a benign course (5.29 [IQR: 2.60∼11.52] μg/mL, p<0.01). The occurrence of MACEs was increased with increasing D-dimer level (p=0.017). In the first quartile (D-Dimer <2.76 μg/mL) sensitivity, specificity, and positive and negative predictive values for predicting MACEs were, respectively, 91.9%, 29.4%, 25.2%, and 93.3%. Conclusion: Patients with D-dimer levels below 2.76 μg/mL have a low risk of MACEs. Our study suggest that D-dimer level may be used to identify low risk patients with normotensive PE.