Capsaicin이 성숙한 흰쥐의 통각반응과 open-field 행동에 미치는 영향

박순권,김현택,나흥식,홍승길 한국심리학회 한국심리학회지 생물 및 생리 Vol.7 No.1

성숙한 흰쥐에게 전신계로 투여한 capsaicin(150㎎/㎏)이 개방장(open-field)행동과 통각반응의 역치 및 반응잠재기에 미치는 효과를 알아보았다. 첫째, open-field행동에는 capsaicin의 효과가 관찰되지 않았는데 이것은 capsaicin이 흰쥐의 정서반응성과 운동기능에는 영향을 미치지 않음을 의미하는 것이다. 둘째, capsaicin 투여에 의해 열자극에 대한 앞발 및 뒷발핥기의 역치는 변화되지 않았으나, 뛰어오르기의 역치는 증가되었다. 또한 역치 이상의 열자극에 대한 뒷발핥기 반응의 잠재기도 capsaicin 투여에 의해 증가되었다. 이 결과는 비교적 약한 열자극에 대한 적응반응에는 capsaicin이 영향을 미치지 않으나 강한 열자극에 대한 대처반응에는 영향을 미치는 것으로 해석된다. We investigated the effects of capsaicin(s.c. 150㎎/㎏) on the open-field behaviors and the thresholds and latency of nociceptive responses in adult rats. Results are as follows. 1) Capsaicin did not affect open-field behaviors. It hints that capsaicin did not alter the emotionality and motor function of rats. 2) Whereas the threshold of jumping was elevated, those of fore and hind paw licking were not in animals treated with capsaicin. Capsaicin also enhanced hind paw licking latency to thermal stimulus over thershold in hot plate test. These results suggest that capsaicin affects the coping reaction to strong thermal stimulus, but not adaptive reaction to mild stimulus, in adult rats.

월성원자력발전소 주변의 삼림식생 분석

이호준,김인택,정흥락,전영문,윤영진,임웅규 建國大學校基礎科學硏究所 1996 理學論集 Vol.21 No.-

월성원자력발전소 주변의 삼림식생을 분석하기 위하여 1994년 4월부터 1994년 10월까지 식물사회학적 조사를 실시하였다. 또한 상관에 의해 현존식생도 및 녹지자연도를 작성하였으며, 순 1차 생산력과 식물현존량도 추정하였다. 군집조성표에 의한 삼림군락은 소나무군락, 곰솔군락, 굴참나무군락, 상수리 나무군락의 4군락으로 구분되었다. 각 군락의 주요 구성종으로는 소나무군락에서 소나무, 졸참나무, 털진달래, 맑은대쑥, 산거울, 곰솔군락에서 곰솔, 소나무, 진달래, 청미래덩굴, 굴참나무군락에서 굴참나무, 조록싸리, 큰기름새, 맑은대쑥, 댕댕이덩굴, 상수리나무군락에서 상수리나무, 갈참나무, 큼기름새, 그늘사초, 맑은대쑥 등이다. 현존식생도에 의한 삼림군락의 분포율은 곰솔군락이 40.3%로 가장 높고, 녹지자연도는 7등급이 60.0%로 가장 넓은 분포율을 보였다. 삼림토양의 pH는 4.45∼5.32, 유기물함량은 5.61∼6.34%의 범위로 나타났다. Montreal model에 의한 순 1차 생산력은 1,555.2g/㎡/yr, 식물현존량은 14,963.32ton/㎢로 추정되었다 The forest vegetation, estimation of phytomass and net primary production on the vicinity of Wolsong Atomic Power Plant were analyzed on the basis of the phytosociological data. And depending on physiognomy, actual vegetation map and the degree of green naturality(DGN) was drawn in 1:50,000 scale. According to Z-M method, the forest vegetation was classified into 4 communities; A. Pinus densiflora community, B. Pinus thunbergii community, C. Quercus variabilis community, D. Quercus acutissima community. Generally, Pinus densiflora, Quercus variabilis, in tree-1 layer, Quercus acutissima, Quercus variabilis, in tree-2 layer, Rhodedendron mucronulatum, Quercus serrate, in shrub layer, Artemisia keiskeana, Carex humilis, in herb layer, showed high coverage index. The pH and contents of organic matter of the forest soil collected in each sites were shown range of 4.45 to 5.32 and 5.61% to 6.34% in mean of communities respectively. The distribution rate in actual vegetation map were the highest in Pinus thunbergii community. The average DGN showed to 5.1. Net primary production and phytomass per unit area which estimated by Montreal model were assumed in 1,555.2g/㎡/yr, 14,963.32ton/㎢, respectively.

후방순환계 뇌동맥류의 임상분석

임동준,이훈갑,정흥섭,김봉룡,권택현,이기찬,서중근 대한신경외과학회 1998 Journal of Korean neurosurgical society Vol.27 No.11

FET형 반도체 마이크로센서 개발(Ⅱ)

손병기,이흥락,박이순,조진호,이성필,최평,서화일,고성택,박재윤,서장수,김창수 경북대학교 센서기술연구소 1994 연차보고서 Vol.1994 No.-

현재 의료진단, 화학공정의 모니터링이나 환경공학적 감시 및 제어 등의 분야에서 사용되고 있는 기존의 센서는 고가이며 용적이 클 뿐만 아니라 분석시간이 길고 사용하기 까다로운 것 등 여러 가지 문제점이 있다. 또한 측정환경에 영향을 주지 않을 만큼 충분히 작으며 빠른 분석시간을 가진 센서를 필요로 하고 있다. 본 연구에서는 기존의 센서들의 난점을 극복할 수 있는 새로운 형태의 FET형 전해질(electrolyte : H^+, K^+, Ca^2+, Na^+)분석 시스템, 용존가스(O_2, CO_2)분석 시스템의 개발을 중점적으로 추진하며, FET형 압력센서, 습도센서, 방사형 온도센서 등의 개별 FET형 센서에 관한 연구도 병행하고자 한다. Recently various kinds of sensors have been developed, being applicated to their own purpose. There are lots of difficulties to apply them to measurements in which the real-time monitoring is required without disturbing the surrounding environment. FET type semiconductor sensors, fabricated by the semiconductor integration technologies, have many advantages for their miniaturization, standardization, mass-production and in vivo/in situ monitoring. They also hold a very proper configuration for multi-functional sensors or integrated smart sensors, and wide availability by forming various kinds of physical or chemical sensing materials onto their sensing gates.

Capsaicin 사전 투여에 의한 흰쥐의 공격성 감소 및 자율적 체온조절의 결손

박순권,홍승길,나흥식,김현택 한국심리학회 한국심리학회지 생물 및 생리 Vol.7 No.1

capsaicin 사전 처치가 흰쥐의 공격성과 체온조절에 미치는 영향을 알아보았다. 생후 6주경에 capsaicin을 피하주사하였고, 완전히 성숙한 후에 공격성 및 체온조절 기능을 검사하였다. 실험 1의 공격성 검사 결과 capsaicin 처치동물들의 공격성은 통제동물보다 낮았는데, 이것은 선행 연구의 결과와 상반된다. 체온조절 기능을 알아본 실험 2에서는 capsaicin 처치동물들이 37℃ 및 40℃ 조건에서 과체온과 빠른 체온증가를 보여주었다. 이것은 출생 직후 또는 성숙한 후에 약물을 투여한 선행연구들과 일치되는 결과이다. 따라서 capsaicin이 체온조절에 미치는 영향은 투여 시기와 무관한 것 같다. 논의에서는 본 연구의 두 가지 결과를 시상하부와 관련시켜 해석하였다. The present study was designed to examine effects of capsaicin administration on aggressive behaviors and autonomic thermoregulation in rats. In six-week-old rat, capsaicin was injected subcutaneously on 4 consecutive days in increasing doses(20㎎/㎏, 30㎎/㎏, 30㎎/㎏, 50㎎/㎏) to total of 150㎎/㎏ of the drug. The controls were treated in the same way with vehicle alone. Two experments began six or eight weeks after the treatment. In experiment 1, isolation-induced agressive behaviors, scored a 10-min session in the dyadic situation, were significantly decreased by capsaicin pretreatment. This result was not in accord with the previous findings. In experiment 2, body temperature of the capsaicin-treated rats increased more than the control's at two amibient temperatures studied(37℃ and 40℃). Our result concerning thermoregulation supports the preceding studies that applied to the capsaicin-treated animals as neonate or adult. Thus, it is likely that the effect of capsaicin treatment on thermoregulation has nothing to do with the age of capsaicin injection. The capsaicin effects from this study were compared with hypothalamic lesion effects in the discussion part.

純 알루미늄의 切削性에 관한 硏究

全泰玉,全彦燦,朴興植,朴永宅 동아대학교 공과대학 부설 한국자원개발연구소 1989 硏究報告 Vol.13 No.2

In this paper, results of test about machinability of the carbide tools having various tool angle on light cutting are described. The conclusion is as follows ; 1. According to the increase of cutting speed, specific cutting forces are decreased. 2. According to the increase of cutting speed and feed, chip width and chip thickness are both decreased. 3. The experimental roughness of working surface became smaller than theoretical roughness. 4. Size of burrs decreased with increase of disengage angle.

이동통신 멀티미디어 데이터서비스의 트래픽 특성 모델링 및 성능분석

정용주,백천현,김후곤,최택진,양원석,황흥석 한국경영과학회 2003 한국경영과학회지 Vol.28 No.2

The aim of this study is to identify the data traffic capacity of 3G mobile communication networks, especially of cdma2000-1X networks. Three-layered ON/OFF traffic model is used to describe the dynamics of data traffics and the process of data transmission such as packet scheduling. We construct a simulator fully incorporating packet handling process of cdma2000-1X data network as well as three-layered ON/OFF traffic model describing the behavior of source data traffics. To get influence of traffic parameters on performance measures, the extensive simulations were performed for several data sets which are obtained from real trace data or previous studies. The experimental results show that the engineered throughput satisfying QoS criteria is approximately 20% of total capacity. Finally, some proposals to improve the system capacity are followed.

고리원자력발전소 주변의 식생과 식물현존량 추정

김성종,이호준,김인택,김창호,정홍락 建國大學校基礎科學硏究所 1995 理學論集 Vol.20 No.-

고리원자력발전소 주변의 식생에 대한 식물사회학적 조사를 실시하였으며, 순1차생산력과 식물현존량을 추정하였다. 또한 상관에 의한 현존식생도 및 녹지자연도를 작성하였다. 종조성표에 의한 식물군락은 소나무군락, 곰솔군락, 서어나무-굴참나무군락, 아까시나무군락으로 구분되었다. 소나무군락은 아교목층(평균식피율 35%)이 빈약하였으며, 서어나무-굴참나무군락은 비교적 안정된 계층구조를 이루고 있었다. 전체적으로 교목층에서 소나무, 곰솔, 아교목층에서 사방오리, 졸참나무, 저목층에서 졸참나무, 사스레피나무, 초본층에서 산거울, 주름조개풀 등의 피복지수가 높았다. 삼림토양의 pH는 4.30~4.85, 유기물함량은 6.04~9.40%의 범위였다. 현존식생도에 의한 분포비율은 곰솔군락(31.4%)이 가장 높았으며, 평균녹지자연도는 5.4였다. Montreal model에 의한 순1차생산력은 1555.2g/㎡/yr, 식물현존량은 단위면적당16,982,21ton/k㎡으로 추정되었다. The forest vegetation and estimation of phytomass and net primary production in the vicinity of Kori Atomic Power Plant was analyzed on the basis of the phytosociological data. Depending on physiognomy, actual vegetation map and the degree of green naturality(DGN) was also drawn in the of 1:50,000. According to Z-M method, the forest vegetation was classified into four communities, which include Pinus densiflora, Pinus thunbergii, Carpinus laxiflora-Quercus variabilis, and Robinia pseudo-acacia communities. The Pinus densiflora community was most poorly covered in tree-2 layer. The Carpinus laxiflora-Quercus variabilis community was relatively stable in the stratum structure. It was generally shown that Pinus densiflora and Pinus thunbergii in tree-1 layer, Alnus firma and Quercus serrata in tree-2 layer, Quercus serrata and Eurya japonica in shrub layer, and Carex humilis and Oplismenus undulatifolius in herb layer had high coverage index. The pHs and contents of organic matter of the forest soil collected in each sites was in the range of 4.30 to 4.85 and 6.04% to 9.40% in average in the communities. The Pinus thunbergii community showed the highest distribution rate(31.4%) in the actual vegetation map. The average DGN was approximately 5.4. Net primary production and phytomass per unit area obtained by Montreal model were estimated to be 1555.2g/㎡/yr and 16,982.21ton/k㎡, respectively.

H₂가스 농도에 따른 SiC유도탄소막의 마모 및 마찰거동 평가

Heung-Taek Bae(배홍택),Ji-Hoon Jeong(정지훈),Dae-Soon Lim(임대순) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.11

Carbide Derived Carbon (CDC) layer is formed by reacting SiC with chlorine gas at 1000℃. Effect of H₂ gas concentration which participate to a form of carbon layer was investigated about the effect of the variation of tribological properties. H₂ gas concentration was varied with 1.7 vol%~13.3 vol% on the each carbon layer form. And carbon layer was analysed by SEM, Raman spectroscopy and Fourier transform infrared (FT-IR). Tribological properties were measured using ball-on-disk tester. Friction coefficient was varied between 0.12 and 0.17 with variation of H₂ gas concentration. This results revealed correlation between tribological properties and H₂ gas concentrations, such as, sp³ -CH₂ bonding structure which appear from the surface of the specimen represented the softness of carbon layer. And we confirmed that H₂ gas concentration affects to tribological property.

Effect of C1₂ gas concentration of the surface modified TiC on the tribological properties

Heung-Taek Bae,Dae-Soon Lim,Byung-Chul Na 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.11

Carbide-derived carbon coating has been synthesized by low temperature treatment of TiC disk with H₂/C1₂ mixture gases. A variety of physical measurements indicate that Ti was extracted by exposure of Cl₂ gas. The thickness of carbon layer and ID/IG ratio increased with increasing Cl₂ concentration. Wear coefficient and frictional coefficient decreased 50% and 19% respectively compared to these properties with untreated TiC samples when 3.3vol% of Cl₂ was flowed during the treatment.