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정영수,박용구,Chung, Young-Soo,Park, Yong-Goo 한국콘크리트학회 1999 콘크리트학회지 Vol.11 No.2
본 실험적 연구에서는 동적신호분석기를 사용하여 고강도 콘크리트 재료의 1차 공명진동수, 동탄성계수, 동전단탄성계수, 감쇠비 및 동포아송비등의 재료의 동적물성값을 실험적으로 규명하였다. 선정된 배합비에 따라 제작된 고강도 콘크리트 시험체의 압축강도 실험후 lst Natural Frequency, 동탄성계수, 동전단탄성계수, 동포아송비와 같은 역학적 성질들을 공명주기법을 이용한 비파괴 실험을 실시하여 그 결과로부터 동탄성계수 및 동전단탄성계수, 재료적 감쇠비를 파악하기 위하여 공명진동실험을 수행하였다. 또한 구조적 감쇠비와 고유주파수 등을 규명하기 위하여 각 배합별로 $15{\times}10{\times}240cm$의 RC보시험체를 제작하여 자유진동시험를 실시하여 주파수 영역에서 Half-Power Bandwidth방법으로 측정하였다. 그리고 정적하중으로 RC보시험체에 균열을 발생시킨 후 하중단계별 고유진동수, 감쇠비등을 조사하여 손상정도에 따른 변화를 비교, 분석하였다. 실험결과 동적실험, 즉 공명진동실험으로 고강도 콘크리트와 제진재 혼입콘크리트의 재료적 동적물성을 측정하였고 강도증가에 따라 재료적 감쇠비 감소현상을 확인할 수 있었다. RC보시험체는 하중단계에 따라, 즉 손상정도에 따라 고유진동수는 감소하고 구조적 감소비는 증가하는 경향이 나타났다. In these days, construction activities have caused civil petitions associated with vibration-induced damages or nuisances. Therefore, it is strongly needed to develop a remedial technique to mitigate unfavorable effects. The objective of this experimental research is to investigate material and structural dynamic characteristics of vibration-controlled concretes which have been proportionally mixed with various vibration reducing material, such as latex, rubber powder, plastic resin, polystyrofoams and etc. Normal and high strength concrete specimens are also prepared for corresponding comparison. As part of the recycling research for obsolete rubber and plastic materials, 32 concrete cylinders and 10 concrete flexural beams have been made for material and structural dynamic properties, respectively. In accordance with the resonance test on concrete cylinders, it can be concluded that concrete with vibration-reducing material have relatively larger material damping ration than normal or high strength concrete. Styrofoam is determined to be very effective vibration-reducing mixtures. From the vibration test on 10 concrete flexural beams, meamwhile, of importance observations was that material damping ratio is very smaller than structural damping ratio of corresponding specimen. But further vibration test on more flexural beams should be strongly needed by varying support conditions.
수두증 흰쥐 모델에서 수두증 정도에 따른 체성 감각 유발 장전위의 변화
김동석,이광수,박용구,김세혁,최중언,이배환,류재욱,Kim, Dong-Seok,Lee, Kwang-Soo,Park, Yong-Goo,Kim, Se-Hyuk,Choi, Joong-Uhn,Lee, Bae-Hwan,Ryou, Jae-Wook,Zhao, Chun-Zhi 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.1
Objective : Somatosensory evoked potential(SSEP) has been known to be a good method for evaluating brain stem function, but it is not sufficient to check the fine changes of cortical functions. A fine change of cortical function can be expressed with somatosensory evoked cortical field potential(SSEFP) rather than general SSEP. To confirm the usefulness of SSEFP for evaluating the cortical function, the authors simultaneously measured SSEFP and the intracranial pressure-volume index(PVI) in kaolin-induced hydrocephalic rats. Method : Hydrocephalus was induced with injection of 0.1ml kaolin-suspended solution into the cisterna magna in 60 Sprague-Dawley rats. The authors measured PVI and SSEFP 1 week after injection of kaolin-suspended solution. To evaluate the severity of induced hydrocephalus, we measured the transverse diameter of the lateral ventricle on the coronal slice of the rat brain 0.40mm posterior to the bregma. Result : The typical wave form of SSEFP in control rats showed a negative-positive complex wave at early latency. In SSEFP of normal rats, N0 is 10.0 msec, N1 15.3 msec, P1 31.2 msec and N1-P1 amplitude $15.4{\mu}V$. As hydrocephalus progressed, the peak latency of N1 and P1 were delayed. In mild hydrocephalus, negative peak waves were split. The N1-P1 amplitude was decreased only in severe hydrocephalus. The changes of the characteristics of SSEFP according to the severity of hydrocephalus were well correlated with the changes of PVI. Shunting normalized the characteristics of SSEFP in relation to ventricular sizes and PVI in hydrocephalic rats. Conclusion : SSEFP may be useful for evaluating the impairment of cortical function in hydrocephalus.
ISSR 표지에 의한 우리나라 야생 차나무집단의 유전다양성
양병훈(Byeong-Hoon Yang),홍용표(Yong-Pyo Hong),이갑연(Kab-Yeon Lee),정병춘(Byeong-Choon Jeong),박용구(Young-Goo Park) 한국차학회 2010 한국차학회지 Vol.16 No.3
To monitor the traces of Korean wild tea (Camellia sinensis) populations, ISSR markers (4 ISSR primers) were analyzed in 38 populations (10 individuals per population) in Korea. A total of 32 ISSR amplicons were counted using 4 primers. Shannon’s index (S.I.) indicating genetic diversity ranged from 0.201 (Mt. Baekyoung) to 0.442 (Mt. Gunyu) with a mean of 0.343. Although the level of genetic diversity was relatively low compared to other woody plants, population differentiation was somewhat pronounced that a relatively high level of genetic differentiation among populations was found (13.28%). At least 9 groups originating from an independent progenitor population could be postulated on the basis of topology of UPGMA. As expected from the introduced and cultivated tree species, genetic relationships among the populations did not coincide with geographic affinity.
양병훈(Byeung-Hoon Yang),한상돈(Sang-Don Han),구영본(Yeong-Bon Koo),박용구(Yong-Goo Park) 한국자원식물학회 2006 한국자원식물학회지 Vol.19 No.1
본 연구는 우리나라 특산수종이며 조경 및 원예적 가치가 높은 노각나무 유전변이를 조사하기 위해 6개 천연집단을 선발하여 DNA I-SSR 표지자를 사용, 유전다양성 및 유전구조를 조사하였다. 5개의 I-SSR primer(#813, 815, 818, 820, 823)에서 총 61개의 증폭산물을 관찰할 수 있었으며, 유전 다양성을 나타내는 P(Percentage of polymorphic loci)값과S.I.(Shannon s information Index)가 남쪽에 분포하는 오봉산(P=88.5%, S.I.=0.467), 금산(P=86.9%, S.I.=0.427), 바랑산(P=83.6%, S.I.=0.425)집단이 높았으며, 북쪽(내륙)에 분포하는 소백산(P=80.3%, S.I.=0.396), 지리산(P=77.1%, S.I.=0.368), 가야산(P=75.4%, S.I.=0.358)집단은 낮았다. 전체 유전변이 중 11.8%만이 집단간에 기인하는 것으로 나타났고, 나머지 88.2%는 집단내 개체간의 차이에서 기인하였다. 유전거리를 이용하여 UPGMA법에 의한 유집분석을 실시한 결과 지리적 분포에 대한 뚜렷한 경향은 나타나지 않았다. We investigated the genetic variation in Stewartia koreana Nakai by examining 61 I-SSR amplicons in 120 individuals distributed among six natural populations in Korea. The overall percentage of polymorphic I-SSR amplicons was 81.9% and mean number of amplicons per I-SSR primer was 12.2. Levels of genetic diversity within 6 populations were similar each other[Shannon s Index 0.358~0.467(mean: 0.407)]. The Mt. Obong population had the highest level of genetic diversity and was most distinctive from the other populations. Most variation existed among individuals within population(88.2%). Genetic differentiation among populations(ΦST) was 0.118. The UPGMA dendrogram based on the genetic distance failed in showing decisive geographic relationships.
김민균(Kim Min-Gyun),이동근(Lee Dong-Guen),박용구(Park Yong-Goo),이의현(Lee Ui-Hyun) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
Serviceability problems may be induced in a high-rise building due to lateral loads such as earthquakes or winds. Shear walls in building structures are coupled shear wall systems because of openings. In this study, the application of LRBs for the vibration control of coupled shear wall systems was investigated. Seismic analyses of 10- and 20-story 2D coupled shear wall systems were performed using El Centro(1940) and Taft(1952) earthquake records. According to the analysis results, the seismic response of coupled shear wall systems with LRBs installed at the coupling beams could be effectively reduced.
칼시토닌 고분자 미립자 투여에 따른 골다공증 유발 쥐의 골밀도 변화
최정원(Jeong won Choi),정제순(Je soon Jung),이상건(Sang Gun Lee),백두진(Doo Jin Paik),박일규(Il Kyu Park),박용구(Yong Goo Park),김미정(Mi Jung Kim) 대한임상노인의학회 2003 대한임상노인의학회지 Vol.4 No.4
Objective: To evaluate bone protective effects of salmon calcitonin microspheres against cancellous bone loss in ovariectomized rats. Method: Thirty five osteoporosis-induced Sprague-Dawley rats were randomly divided into five groups (high dose calcitonin group (112 U/kg), low dose calcitonin group (56 U/kg), free calcitonin group, only ovariectomy group, control group). Ovariectomized rats were injected s.c. with salmon calcitonin microspheres(l12 U/kg or 56 U/kg) weekly, and free salmon calcitonin on alternate days. control rats and the remaining ovariectomized rats were injected s.c. on alternate days with saline vehicle. The effects and side effects in each group were assessed by the bone mineral density and bone histomorphomeσy. Results: 1. At four months after the ovariectomy, the bone mineral densities in high dose calcitonin group were 0.1640±0.0156 grn/㎠, the bone mineral densities in low dose calcitonin group were 0.1600±0.0114 gm/㎠, the bone mineral densities in calcitonin group were 0.1531±0.0168 gm/㎠, the bone mineral densities in ovariectomy group were 0.1404±0.0070 gm/㎠, the bone mineral densities in control group were 0.1896±0.0163 gm/㎠. The bone mineral densities of the femur in ovrariectomy groups compared with control group were decreased with time. The difference of the bone mineral densities between high and low dose calcitonin group and ovariectomy groups was significant (p<0.05). 2. We found that the bone trabeculi in bone histomophometry were more maintained in high dose calcitonin group compared with ovariectomy group. Conclusion: 1. Bone mineral densities of salmon calcitonin microsphere injected rats was higher than only ovariectomized rats in femur. 2. Bone mineral densities of salmon calcitonin microsphere injected rats had no significant differences than only ovariectomized rats in L5 vertebra. 3. In histologic examination, salmon calcitonin microsphere and free salmon calcitonin injected rats showed more prominent bony trabeculae than ovariectomized rats.