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잣나무 조림지의 시계열 생장모니터링 -강원대 학술림 잣나무 영구표준지를 중심으로-
강성학 ( Sung Hak Kang ),홍성우 ( Sung Woo Hong ),유병오 ( Byung Oh You ),최정기 ( Jung Kee Choi ),최인화 ( In Hwa Choi ) 산림경영정보학회 2004 산림경영정보 Vol.7 No.2
본 연구는 강원대학교 산림과학대학 부속 학술림내 32년생 잣나무인공림의 영구표준지 (50m × 50m)를 대상으로 시계열 생장변화를 분석하였다. 총 4차에 걸친 임목조사(1984-2004)를 분석한 결과 영구표준지의 임목본수는 601본에서 213본으로 줄어들어 2004년 현재 ha당 852본으로 파악되었다. 평균흉고직경은 4.1cm에서 19.8ctn로 증가하여 19년 동안 매년 평균 0.83cm, 평균수고는 3.2m에서 14.4m로 매년 0.6m, ha당 임목재적은 8.1㎥에서 199.8㎥로 증가하여 매년 10.1㎥/ha씩 생장하였다. 그리고 흉고직경과 수고, 흉고직경과 수관폭과의 관계는 모두 양적 선형관계로 나타났으며, 영구표준지내 울폐도는 3차조사결과 121%를, 4차조사에는 253%를 차지하여 4년 동안 2.1배가 증가한 것으로 나타났고, 수간이 분화된 임목은 총 33본으로 전체임목의 15.5%로 조사되었다. 제 4차조사시 잣나무 영구표준지내의 출현한 하층식생 개체수는 총 110본으로 물참대(30%), 고추나무(17.3%), 생강나무(15.5%)순으로 파악되었고, 하층식생에 의한 피복면적은 75.2㎡으로 영구표준지의 3% 를 차지하며, 하층식생의 평균 수고는 73.8cm, 평균 수관폭은 66.3cm로 나타났다. This study was analyzed about tree growth by time series for a 32 year-Pinus korariensis permanent plot(50mx50m) in the research forests in Kangwon National University(KNU). Through the results of 4 inventories(1984-2004), number of trees in permanent plot had decreased from 601 to 213(852trees/ha) in 2004. For 19 years, average diameter had increased by 4.1cm to 19.8cm(0.78cm/year), average height had increased by 3.2m to 14 .4m(0.6m/year), and tree volumes had increased by 8.1㎥ to 199.8㎥(10.1㎥/ha/year). DBH vs. Height and DBH vs. Crown diameter had positively linear trend on their scatter plots. Crown closure of permanent plot became 121% in the 3rd inventory and 253% in the 4th inventory, so it increased 2.1 times for 4 years. The forked trees were 33 trees(15.5%) of total trees. In the 4th inventory, understory vegetation appeared 110 population of Deutzia glabarta Kom. (30%), Staphylea bumalda DC. (17.3%), Lindera obtusiloba Bl.(l5.5%) and so on. Crown projection area of understory vegetation was 75. 2㎡, 3% of permanent plot area. A verage height and crown diameter of understory vegetation were 73. 8cm and 66. 3cm respectively.
정현주 ( Hyun Ju Jung ),강성학 ( Sung Hak Kang ),임경실 ( Kyung Sil Im ),이재명 ( Jae Myeong Lee ),김대영 ( Dae Young Kim ),홍상현 ( Sang Hyun Hong ),김종분 ( Jong Bun Kim ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.51 No.4
One of the most fearful rare complication of ureteroscopic lithotripsy is sepsis. Since sepsis after endourological maneuvers usually occur immediately after procedure, it is important to pay attention to symptoms representing sepsis such as pyrexia, tachycardia, tachypnea, and oliguria. In addition to clinical symptoms, laboratory tests including white blood cell (WBC) count, C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), and urine and blood cultivating can help to diagnosis of sepsis. We present a case of shock after ureteroscopic lithotripsy, which was suspected with septic shock strongly. (Korean J Anesthesiol 2006; 51: 508~11)
Active Vibration Control Method Using Frequency Controllable Piezoelectric Transducer
김정순,김무준,하강렬,강성학,Kim, Jung-Soon,Kim, Moo-Joon,Ha, Kang-Lyeol,Kang, Sung-Hak The Acoustical Society of Korea 2007 韓國音響學會誌 Vol.26 No.e1
Hydraulic actuator and electro-magnetic liner actuator have been used as typical active vibration control methods. However these methods have many kinds of disadvantages such as causing space limit, difficult maintenance, complicate structures, etc. The purpose of this paper was to study on the possibility of active vibration control using piezoelectric transducer. Piezoelectric transducer generated a vibration and GIC (General Impedance Converter) amplifier was adopted to give adjustable vibration signal to transducer and high amplitude of vibration. Resonance frequency of piezoelectric transducer was controlled by GIC amplifier and higher amplitude of vibration was achieved. Finally active vibration control using piezoelectric transducer was performed.