오차드그라스의 예취빈도에 따른 무기태질소의 단기시용 효과

조익환,이용세,전하준 대구대학교 과학기술연구소 1998 科學技術硏究 Vol.5 No.2

A study was made to estimate the economic level(Necon.) of mineral nitrogen and a proper cutting frequency for the dry matter production of Orchardgrass (Dactlyis glomerata L.) during the harvested years in 1993∼1995. Annual mineral nitrogen was applied at the levels of 0, 90, 180, 270 and 360 kg ha^(-1) in 3 cuttings, 0, 120, 240. 360 and 480 kg ha^(-1) in 4 cuttings, and 0. 150. 300. 450 and 600 kg ha^(-1) in 5 cuttings, respectively. The dry matter yields of all cutting frequencies in 1993 were significantly higher than in the other harvested years. Mean dry matter yield were 13.1, 12.7 and 14.3 tons ha-1 in 3, 4 and 5 cuttings, respectively. Higher efficiencies of dry matter production in response to mineral nitrogen application were recorded as 12.9 kg at level of 360 kg ha^(-1) yr-1 in 3 cuttings. 27.3 kg at level of 240 kg ha-1 yr^(-1) in 4 cuttings, and 20.5 kg at level of 150 kg ha-1 yr-1 in 5 cuttings, respectively. Significantly higher dry matter yields appeared as 4.6 tons ha-1 at 1st cut in 3 cuttings, 3.7 tons and 4.1 tons ha^(-1) at 2nd cut in 4 and 5 cuttings, respectively. The estimated marginal dry matter yields(Ymar.) were 11.7∼12.3 tons ha^(-1) at ranges of economic N level of 285.5∼316.6 kg ha^(-1) yr^(-1) in 3 cuttings, 10.4∼10.5 tons ha-1 at ranges of 176.7∼196.6 kg ha^(-1) yr^(-1) in 4 cuttings, and 11.2∼11.6 tons ha^(-1) at ranges of 246.1∼286.0 kg ha^(-1) yr^(-1) in 5 cuttings, respectively. Maximun dry matter yields(Ymax.) were 14.3 tons at the level of limiting N(Nmax.) of 379.5 kg ha^(-1) yr^(-1) in 3 cuttings. 11.1 ton at level of limiting N of 298.4 kg ha^(-1) yr^(-1) in 4 cuttings, and 12.3 ton at level of limiting N of 467.7 kg ha^(-1) yr^(-1) in 5 cuttings, respectively. Economic N level in all cuts were in the ranges of 85.1∼116.1 kg ha^(-1) cut^(-1) in 3 cuttings, 31.3∼69.7 kg ha^(-1) cut^(-1) in 4 cuttings, and 30.8∼81.4 kg ha^(-1) cut^(-1) in 5 cuttings, respectively.

Bloodstream Infections and Clinical Significance of Healthcare-associated Bacteremia: A Multicenter Surveillance Study in Korean Hospitals

Son, Jun Seong,Song, Jae-Hoon,Ko, Kwan Soo,Yeom, Joon Sup,Ki, Hyun Kyun,Kim, Shin-Woo,Chang, Hyun-Ha,Ryu, Seong Yeol,Kim, Yeon-Sook,Jung, Sook-In,Shin, Sang Yop,Oh, Hee Bok,Lee, Yeong Seon,Chung, Doo The Korean Academy of Medical Sciences 2010 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.25 No.7

<P>Recent changes in healthcare systems have changed the epidemiologic paradigms in many infectious fields including bloodstream infection (BSI). We compared clinical characteristics of community-acquired (CA), hospital-acquired (HA), and healthcare-associated (HCA) BSI. We performed a prospective nationwide multicenter surveillance study from 9 university hospitals in Korea. Total 1,605 blood isolates were collected from 2006 to 2007, and 1,144 isolates were considered true pathogens. HA-BSI accounted for 48.8%, CA-BSI for 33.2%, and HCA-BSI for 18.0%. HA-BSI and HCA-BSI were more likely to have severe comorbidities. <I>Escherichia coli</I> was the most common isolate in CA-BSI (47.1%) and HCA-BSI (27.2%). In contrast, <I>Staphylococcus aureus</I> (15.2%), coagulase-negative <I>Staphylococcus</I> (15.1%) were the common isolates in HA-BSI. The rate of appropriate empiric antimicrobial therapy was the highest in CA-BSI (89.0%) followed by HCA-BSI (76.4%), and HA-BSI (75.0%). The 30-day mortality rate was the highest in HA-BSI (23.0%) followed by HCA-BSI (18.4%), and CA-BSI (10.2%). High Pitt score and inappropriate empirical antibiotic therapy were the independent risk factors for mortality by multivariate analysis. In conclusion, the present data suggest that clinical features, outcome, and microbiologic features of causative pathogens vary by origin of BSI. Especially, HCA-BSI shows unique clinical characteristics, which should be considered a distinct category for more appropriate antibiotic treatment.</P>

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.

몬순기후와 복잡지형의 특성을 갖는 광릉 산림유역의 물과 탄소순환에 대한 교차규모 연구로부터의 교훈

이동호 ( Dong Ho Lee ),김준 ( Joon Kim ),김수진 ( Su Jin Kim ),문상기 ( Sang Ki Moon ),이재석 ( Jae Seok Lee ),임종환 ( Jong Hwan Lim ),손요환 ( Yo Whan Son ),강신규 ( Sin Kyu Kang ),김상현 ( Sang Hyun Kim ),김경하 ( Kyong Ha Kim 한국농림기상학회 2007 한국농림기상학회지 Vol.9 No.2

광릉 슈퍼사이트에서 대기와 식생간의 에너지와 물질교환 규명은 지형과 식생의 복잡성으로 인해 많은 기술적인 어려움에 직면하고 있다. 따라서 KoFlux 연구에서는 상호보완적인 다중 분야의 연구를 통해 이러한 어려움을 극복하기 위한 시도를 해 오고 있다. 본 논문에서는 현재 진행중인 KoFlux 연구의 예비결과 중 특히 광릉사이트에서의 물/탄소수지, 물과 탄소순환의 상호관련성 그리고 몬순기후하의 생태계에서 탄소순환에 미치는 수문학적 요인의 중요성에 대해 중점적으로 논의하고자 한다. 광릉낙엽활엽수림의 순생태생산량 (NEP)은 광범위한 생태학적 연구결과에 따르면 약 ~2.6 t C/ha/y로 예상된다. 이를 미기상 플럭스 관측 결과와 함께 고려할 때 광릉 산림은 탄소의 중요한 육상흡원으로서 기능함을 예상할 수 있다. 다양한 생태수문 관측에 의해 규명된 유역단위 물수지에 의하면 연단위 전체강수량의 약 30-40%가 증발산 (ET)에 해당함을 나타내고 있다. 광릉산림의 대표적인 수종인 졸참과 서어나무의 잎에서 얻어진 탄소 안정동위 원소 조성에 근거하여 계산된 식물 성장기간의 평균 물 이용효율(WUE)은 약 ~12 μmol CO2/mmol H2O에 해당된다. 얻어진 증발산량과 물이용효율은 유역단위의 생태계 생산량을 산출하는데 이용될 수 있다. 나이테 성장량과 토양호흡량의 연단위 변화는 강수량과 강수의 패턴에 의해 크게 영향을 받음을 보이고, 이는 몬순기후에 영향을 받는 동아시아 지역 생태계에서 탄소 순환과정이 수문학적 조건과 밀접한 상관관계를 가짐을 지시한다. 연구지역의 공간적 특성을 정량화하기 위해 관측지의 구조 및 기능적 단위를 규명하기 위한 연구가 진행되고 있고 이를 통해 서로 다른 시공간 규모에서 진행되고 있는 연구의 결과물을 체계적으로 연결 통합하고 나아가 보다 광역적인 규모에서 대표적인 물/탄소 수지를 산출하기 위한 연구가 시도되고 있다. KoFlux Gwangneung Supersite comprises complex topography and diverse vegetation types (and structures), which necessitate complementary multi-disciplinary measurements to understand energy and matter exchange. Here, we report the results of this ongoing research with special focuses on carbon/water budgets in Gwangneung forest, implications of inter-dependency between water and carbon cycles, and the importance of hydrology in carbon cycling under monsoon climate. Comprehensive biometric and chamber measurements indicated the mean annual net ecosystem productivity (NEP) of this forest to be ~2.6 t C ha-1 y-1. In conjunction with the tower flux measurement, the preliminary carbon budget suggests the Gwangneung forest to be an important sink for atmospheric CO2. The catchment scale water budget indicated that 30~40% of annual precipitation was apportioned to evapotranspiration (ET). The growing season average of the water use efficiency (WUE), determined from leaf carbon isotope ratios of representative tree species, was about 12 μmol CO2/mmol H2O with noticeable seasonal variations. Such information on ET and WUE can be used to constrain the catchment scale carbon uptake. Inter-annual variations in tree ring growth and soil respiration rates correlated with the magnitude and the pattern of precipitation during the growing season, which requires further investigation of the effect of a monsoon climate on the catchment carbon cycle. Additionally, we examine whether structural and functional units exist in this catchment by characterizing the spatial heterogeneity of the study site, which will provide the linkage between different spatial and temporal scale measurements.

비기능성 부신피질암 1례

하달봉,이경섭,손형규,이준희,원유홍,김동훈,장태정 동국대학교 경주대학 1996 東國論集 Vol.15 No.-

비기능성 부신피질암은 발생 빈도가 극히 드문 악성 종양이며, 내분비학적 임상증상이 없어 주로 복부 종물에 의해 우연히 발견된다. 그래서 대부분 종양의 크기가 거대하고 전이로 진행된 경우가 흔하며, 절제술만으로는 치유 불가능한 경우가 많아 예후가 불량한다. 최근 저자들은 약 10년간 간헐적인 좌측 측복통과 흉부 압박감으로 내원하여, 이학적 검사 및 방사선학적 검사상 복부 종물이 확인되고 생화학적 검사에서 비기능성으로 판명된 52세 남자 환자에서 근치적 신절제술을 시행하여 병리조직검사상 비기능성 부신피질암으로 진단되었기에 문헌 고찰과 함께 보고하는 바이다. Nonfunctioning adrenocortical carcinoma is extremely rare, which is diagnosed most often in older man because of mass effect. Most tumors are discovered too late for curative resection, and advanced tumors are associated with a poor prognosis. Herein we report on a 52-year-old man with nonfunctioning adrenocortical carcinoma, treated by radical nephrectomy.

Hough Transform을 이용한 다수의 선 추출에 대한 algorithm

李河運,朴贊俊 동양대학교 2000 동양대학교 논문집 Vol.6 No.1

An optimized algorithm to get the complete line segments applying the butterfly shapes to the peaks in the Hough domain is proposed in this paper. This algorithm is based on the exactly peak finding method and the digital error reducing technique for obtaining the correct coordinates of the envelope points of the butterfly wing. In particular, the proposed algorithm is robust to extract the multiple lines in which the lines have high length ratio and relative close position. The accuracy of detecting lines is stable. The different patterns, which have multiple lines including various direction, are used as the test of the method.

음향 Intensity 측정에서 Phase Errors

李俊河,張浩京,金禮顯,金成奎 嶺南大學校附設 基礎科學硏究所 1988 基礎科學硏究 Vol.8 No.-

The finite-approximation errors of measuring acoustic intensity using two closely spaced microphones are examined in this paper. The phase errors are considered by measuring the residual intensity between the two microphone systems exposing them to the same sound over awide range of frequencies. The loudspeaker in the pressure chamber is fed with white or pink noise, and the pressure spectra from the two microphones is identical. The measuring errors are estimated by checking the difference between the measured sound pressure and sound intensity. For the microphone separation of 12mm, the finite-approximation errors are shown to be less than ±1dB from 125 Hz to 5KHz.

水原樹木園地域內의 自然森林植生 調査結果

李峻雨,禹保命,辛俊煥,金景河,兪鐘德 서울大學校 農科大學 1985 서울대농학연구지 Vol.10 No.2

樹木園 活成豫定地를 對象으로 土壤 水分含量과 植生을 調査하여 앞으로의 樹木園 造成에 필요한 情報를 얻음과 동시에 樹木園 造成에 따른 植生破壞後 原來植生에 關한 情報가 必要할 때 參考하기 爲하여 1985年 6月 12日에 本 調査를 實施하였는데 그 結果는 다음과 같다. 1. 全體的으로 겨이삭(Agrostis clavata var. nukabo)의 優占度가 매우 높았으며 씀바귀(Ixeris dentata)와 흰씀박귀(Ixeris dentata var. albiflora)는 극히 乾燥한 곳을 제외하고는 대부분 優占度가 높았다. 濕한 곳에는 왕비늘사초(Carex maximowiczii), 기장대풀(Isachne globosa) 等이, 극히 乾燥한 곳에서는 잔디(Zoysia japonica)가, 보통 乾燥한 곳에서는 그늘사초(Carex lanceolata), 김의털(Festuca ovina) 等이 優占度가 높았다. 2. 特히 稀貴植物인 선제비꽃(Viola raddeana)群落과 진퍼리용담(Grntiana scabra var. buergeri for stenophylla)이 Block 3(습지)에 있으므로 앞으로 이 區域은 注意깊게 保存되어야 할 것이다. 3. 土壤 水分含量이 最低 14.7%에서 最高 89.9%까지 分布하여 乾濕의 差異가 심하게 나타났다. 特히 調査 時期가 乾濕期인데도 土壤 水分含量이 70%가 넘는 곳이 3개소나 된다. 이 곳은 地下水位가 높아서 濕地이므로 濕地植物園을 造成해야 될 것이다. 植生의 造成狀態가 區域에 따라 變異가 심하게 나타났기 때문에 이 林地가 매우 不安定한 狀態에 있다고 볼 수 있을 것이다. Soil moisture contents and vegetation of the forest land planed to establish the Suweon Arboretum had been investigated to obtain some informations for establishing arboretum, and also for keeping the original vegetation composition data after the arboretum was established. The results obtained in this investigation could be summarized as follows. 1. In general, the coverage of Agrostis clavata var. nukabo was very high. The coverage of lxeris dentata and ixeris dentata var. albiflora were high except for very arid blocks. Coverages of Carex maximowiczii and Isachne globosa were high in wet blocks. The coverage of Zoysia japonica was high in very arid blocks and that of Carex lanceolata and Festuca ovina in arid blocks were high. 2. Soil moisture content was distributed from 14.7% to 88.9%. Especially the fact of the high moisture content (74.7, 77.5, 88.9%) in dry season implied that the ground water level of this area was high. The vegetation composition of this forest was varied, too. Therefore, it is considered that the stability of this forest was fragile.

음향도파관의 단면적에 관한 연구

李俊河,金禮顯 嶺南大學校附設 基礎科學硏究所 1981 基礎科學硏究 Vol.1 No.-

This paper described Acoustic Waveguide of the various type (Conical, Bessel, Exponential, Parabolic) on the cross sectional area, S of Webster's approximate wave equation.

冠岳樹木園地域內 荒廢山地土壤의 肥沃化를 통한 綠化促進에 關한 硏究(Ⅱ)

李峻雨,李宗學,權台鎬,禹保命,麻鎬燮,金景河 서울大學校農業生命科學大學附屬樹木園 1986 서울大學校 樹木園 硏究報告 Vol.- No.7

The shallow soil depth and severe rock exposures on the hillslopes in the Kwanak aboretum area which resulted from the heavy soil erosion have made very poor growth of forest vegetation. In order to establish the forest vegetation in this area, it is urgent to recover the fertility of soil and the productivity of existing trees. For this reason, fertilization experiment (using the briquet compound fertilizer) was conducted on summer and autumn season in 1983 with the 4 main native species (Pinus densiflora, Pinus rigida, Juniperus rigida, Rhododendron schlippenbachii) growing on these eroded hillslopes. Result in 1985 and 1986 of this experiment represented that the fertilization was effective toward both height and root-collar diameter growth of trees and spring fertilization was, relatively, more effective than autumn fertilization. It also represented that effects of fertilization to P. rigida were more than those to other species. Therefore, besides the engineering methods and afforestation measures for soil erosion control, rapid establishment of vegetation through conservation and recovery of existing trees by fertilization is available measures for the rehabilitation of rockily eroded hillslopes like Mt. Kwanak area.