중성자 선량 측정을 위한 Bubble-Damage Polymer Detector의 개발

우 홍,加藤和明,강영호,김도성 대한방사선 방어학회 1988 방사선방어학회지 Vol.13 No.1

중성자선량측정을 위하여 방사선과의 상호작용으로 인한 과열된 액체의 기화를 원리로 하는 bubble-damage polymer detector를 개발하였다. acrylamide와 글리세린으로 만든 중합체에 과열상태의 Freon12 액체방울을 분산시켜 검출기를 제작하였으며 중성자 조사에 의해 형성된 기포는 즉각적인 육안관측이 가능하였다. 검출기의 중성자 감도는 Am-Be중성자에 대하여 4-7 bubbles/10μSv이었다. A bubble-damage polymer detector, which operation principles are based on vaporization of superheated liquid drops by interaction with radiations, is developed for neutron dosimetry. The detectors are fabricated by dispersing the superheated liquid drops of Freonl2 into transparent and elastic polymer made of acylamide and glycerine. The bubbles formed by neutron irradiation are immediately visible. The neutron sensitivity of the detectors is 4-7 bubbles/10μSv for Am-Be neutrons.

AMYLASE AND INSULIN RELEASE FROM OVINE PANCREATIC SEGMENTS EVOKED BY ELECTRICAL FIELD STIMULATION

Katoh, K.,Sasaki, Y. Asian Australasian Association of Animal Productio 1989 Animal Bioscience Vol.2 No.3

Somatotropic Axis and Nutrition in Young Ruminants around Weaning Time

Katoh, K.,Takahashi, T.,Kobayashi, Y.,Obara, Y. Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.7

The somatotropic (GH-IGF-I) axis consists of many hormonal and nutritional factors that control GH release from the somatotrophs in the anterior pituitary. The GH-releasing substances are GHRH and GHS (GHRP or ghrelin), while the GH release-inhibiting substances are somatostatin (SRIF), insulin-like growth factor-I (IGF-I), leptin and glucocorticoids. However, there is evidence showing that nutrition is involved in the control of the somatotropic axis. In addition, weaning is a drastic event for neonates because their alimentary and endocrine circumstances are changed due to the switch, even if gradual, from a liquid milk diet to one composed of such solids as hay and grains. The biological role of ghrelin is one of the hormonal factors that have been focused on ever since ghrelin was discovered at the end of the last century. A 27-amino acid peptide that is mainly synthesized and released from the abomasum epithelium, ghrelin has not been fully evaluated in relation to the somatotropic axis of the ruminant. It has also proven difficult even to investigate the cellular mechanisms of ghrelin action, because this hormone exerts animal-species-dependent actions via a complex set of intracellular signaling pathways. This is also the case for the action of leptin. Another substance, IGF-I, shows a partial inhibitory action on GH secretion in the ruminant. The effect of nutrition is also different among animal species. This is evident by the fact that undernutrition suppresses the circulating GH levels in rodents, but increases it in ruminants and humans. Recently, weaning has been shown to change the postprandial GH responses in ruminants; milk feeding increases, but hay and concentrate feeding suppress, the postprandial circulating GH levels. Even if the postprandial GH level is increased, the ghrelin level is decreased by milk feeding. Macronutrients also possess stimulatory and inhibitory actions on GH secretion in vivo and in vitro. These findings indicate the complexity of the control mechanisms of the somatotropic axis. In the present review, we summarize recent findings on the factors controlling the axis of the ruminant.

EFFECTS OF HEAT EXPOSURE ON WATER METABOLISM AND PASSAGE IN SHEEP

Katoh, K.,Buranakarl, C.,Matsunaga, N.,Lee, S.R.,Sugawara, T.,Sasaki, Y. Asian Australasian Association of Animal Productio 1989 Animal Bioscience Vol.2 No.2

The present experiment was carried out to investigate the effects of heat exposure on water metabolism and the passage of indigestible particles in sheep. Water intake, respiratory rate, rectal temperature and pH of ruminal fluid and urine were significantly higher (P<0.05) in the hot environment ($32\;^{\circ}C$) than in the control environment ($20\;^{\circ}C$). Urine osmolality and blood volume were increased, while glomerular filtration rate was decreased, in the hot environment. The liquid flow rate from reticulo-rumen and the excretion of indigestible particles of specific gravity 0.99 (but not 1.27 or 1.38) were increased in the hot environment. From these findings, it is suggested that an increased water intake evoked by heat exposure might affect the flow rate of digesta in sheep.

Determination of Intestinal Disappearance of Lysine and Methionine Derived from Ruminally Protected Lysine and Methionine in Holstein Heifers

Watanabe, K.,Sato, H.,Kobayashi, T.,Katoh, K.,Obara, Y. Asian Australasian Association of Animal Productio 2003 Animal Bioscience Vol.16 No.4

In order to estimate the availability of ruminally-protected Lys (RPLys) and Met (RPMet), quantitative changes of free Lys and Met in the total abomasal outflow and feces were determined in three Holstein heifers with a T-shaped duodenal cannula. RPLys was prepared by coating Lys with fat and RPMet with a pH-sensitive polymer. RPLys and RPMet containing 30 g of each amino acid were supplied together to heifers, and total abomasal outflow was collected hourly from the T-shaped duodenal cannula for a 48 h period. Collected abomasal outflows were fractionated into liquid and solid phases to measure free Lys and Met concentration. At 2 wk after total abomasal outflow sampling, heifers were supplied RPLys and RPMet together again, and total feces were collected every 12 h for a 3 d period t estimate excreted RPLys and RPMet in feces. The amounts of Lys and Met recovered from the liquid fractions of abomasal outflow were estimated to be $23.9{\pm}8.3%$ and $68.6{\pm}3.6%$ (p=0.008) of RPLys and RPMet ingested, respectively. Final intestinal disappearances of Lys and Met were estimated to be $49.5{\pm}2.6%$ and $78.2%{\pm}6.5%$ (p=0.015) of ingested RPLys and RPMet, respectively.

한일 17

( K . Jimbo ),( Y . Katoh ),( A . Kohyama ),( M . Ando ) 대한금속재료학회 ( 구 대한금속학회 ) 1999 대한금속학회 추계학술대회 개요집 Vol.1999 No.-

Image Analysis with Spatial Filtering Method for the Velocity of Dropping Particles in the Air

Y .Katoh,M. Miyamoto,S. Kaneko,H. Miike,K. Koga 대한기계학회 1993 International Symposium on Transport Phenomena in Vol.3 No.1

Eoarchean-Paleoproterozoic zircon inheritance in Japanese Permo-Triassic granites (Unazuki area, Hida Metamorphic Complex): Unearthing more old crust and identifying source terrranes

Horie, K.,Yamashita, M.,Hayasaka, Y.,Katoh, Y.,Tsutsumi, Y.,Katsube, A.,Hidaka, H.,Kim, H.,Cho, M. Elsevier Scientific Pub. Co., etc.] 2010 Precambrian research Vol.183 No.1

U-Pb zircon geochronology of two Permo-Triassic granites (samples OT-52 and OT-272 with ages of 229+/-8Ma and 256+/-2Ma, respectively) in the Unazuki area, Hida Metamorphic Belt, southwest Japan, revealed the presence of Eoarchean to Paleoproterozoic inheritance. Inheritance is consistent with both samples showing low zircon saturation temperatures for their bulk compositions. In OT-52, dark in CL, low Th/U zircon domains have a mean <SUP>207</SUP>Pb/<SUP>206</SUP>Pb age of 1940+/-17Ma, which is consistent with an age of 1937+/-6Ma for anatexis in the Precambrian Busan gneiss complex in Korea. Eoarchaean inherited zircons with <SUP>207</SUP>Pb/<SUP>206</SUP>Pb ages from ca. 3750 to 3550Ma are common in OT-272 but are few in OT-52, suggesting a source from rocks with affinities to those in the Anshan area in the northeast China part of the North China Craton. On the other hand, a Hida Metamorphic Belt metasedimentary gneiss into which the granites were intruded contains ca. 1840, 1130, 580, 360, 285 and 250Ma zircons (Sano et al., 2000). These ages suggest that the Unazuki Mesozoic granites did not originate from proximal Hida Metamorphic Complex rocks, but instead from unrelated rocks obscured at depth. The predominance of Eoarchean to Paleoproterozoic age components, and the marked lack of 900-700Ma components suggest that the source was the (extended?) fringe of the North China Craton, rather than from Yangtze Craton crust. The Mesozoic evolution of Japan and its linkages to northeast Asia are discussed in the context of these results.

Digestive Physiology and Feeding of Sika Deer

Y. Sasaki,K. Katoh,S. Oda 건국대학교 동물자원연구센터 1993 국제 심포지움 Vol.- No.4

꽃사슴(Cervus nippon centralis)의 소화기능은 보통 사슴과에서 보여지는 대로 계절적으로 변하며, 이는 체중의 주기적 변동에서도 나타난다. 본 평론에서는 꽃사슴의 소화관을 통한 사료이동속도의 생물학적 특성과 계절적 변화 그리고 사료 소화율을 주고 비교생리학적 관점에서 논하였다. 겨울(12월에서 2월까지)을 제외하고 수사슴은 10월에, 임신한 암사슴은 6월에 체중이 각각 감소하는데 이는 번식행위에 기인된다. 6월 출생시 약 4kg인 송아지 체중은 15개월령이면 암사슴의 경우 거의 50kg에 도달한다. 이들 꽃사슴은 야생초지에서 사육될 때 난쟁이 대나무(dwarf bamboo, Sasa nipponica) 종류를 년중 우선적으로 채식한다. 대나무와 알팔파(Medicago sativa) 건초의 소화율은 각각 50%와 60%였다. 또한 알팔파 건초의 소화율과 전체소화관에서의 평균 체류시간은 착색한 건초 또는 비소화성 플라스틱 입자를 이용하여 측정되어졌으며 그 결과는 꽃사슴과 면양 상호간에 비교되어졌다. 꽃사슴의 평균 체류시간은 면양 보다 짧았으며 그 결과 건초 성분의 소화율은 낮았다. 알팔파 건초를 체중의 2% 수준으로 급여시, 그 건초의 소화율과 통과속도의 계절적 변화를 여름(7월)과 겨율(2월)로 나뉘어 비교하였다. 소화율은 여름보다 겨울에 더 낮았고, 꽃사슴의 소화율은 면양의 소화율 보다 낮았다. 연이은 실험에서 꽃사슴에게 알팔파 건초를 무제한 급여하여 년중 네 번( 5, 8, 11, 2월)에 걸쳐 소화율과 평균 체류시간을 측정 비교하였다. 계절적으로 볼 때 봄에 평균 체류시간은 가장 길었고 소화율은 가장 낮았으며, 가을에는 상대적으로 평균 체류시간은 짧았고 소화율은 가장 높았다. 더욱이 비중이 각기 다른 비소화성 플라스틱 입자들을 이용하는 방법은 반추동물의 반추활동과 사료통과속도에 있어서의 차이를 구별하는데는 유익하였으나 계절적 변화를 평가하는데는 적합치 않았다. In sika deer (Cervus nippon centralis), the digestive function shows seasonal changes as commonly seen in the Cervidae, reflecting the cyclic fluctuation in the body weight. In this review, biological characteristics and seasonal changes in the passage of food through the digestive tract and food digestibility in sika deer were discussed mainly from the point of comparative physiology. The body weight of stags and pregnant hinds is decreased due to the reproductive behaviour in October and June, respectively, except in the winter season (December to February). The body weight of calves, around 4 kg at birth (June), almost reaches that of hinds (50 kg) at 15 months of age. They preferably eat a type of dwarf bamboo (Sasa nipponica) all through the year when fed on a wild grassland. The digestibility of Sasa and lucerne (Medicago sativa) hay, which were fed through the experiments, was 50 and 60 %, respectively. In addition, digestibility of lucerne hay and MRT (mean retention time through the whole digestive tract) were measured using stained hay and indigestible plastic particles, and compared in sika deer and domesticated sheep. The results suggested that sika deer have a shorter MRT than sheep, resulting in lower digestibility of hay components. Seasonal changes in digestibility and passage of lucerne hay were compared between summer (July) and winter (February) at a feeding level of 2 % of body weight. Digestibility in both animal species was lower in winter than in summer, and digestibility in sika deer was lower than that in sheep. In the next experiment, sika deer were fed lucerne hay ad libitum, and digestibility and MRT were compared at four times in the year (May, August, November and February). They showed the greatest MRT and the lowest digestibility in spring, but relatively small MRT and the greatest digestibility in autumn. Furthermore, it was also shown that indigestible plastic particles with various specific gravities were profitable for descriminating the difference in passage pattern as well as rumination activity in the ruminant animals, but were not suitable for assessing a seasonal change.

핵융합로용 저방사화 철강재료(JLF-1)의 강도와 파괴인성

윤한기(H.K.Yoon),김동현(D.H.Kim),이상필(S.P.Lee),박이현(Y.H.Park),공유식(Y.S.Kong),Y.Katoh,A.Kohyama 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4

Reduced activation ferritic steel, JLF-1 steel (Fe-9Cr-2W-V-Ta), is one of the promising candidate<br/> materials for fusion reactor applications. Fracture toughness (JIC) and tensile tests were carried out at<br/> room temperature and elevated temperature (400 ℃). Two types of CT specimen were prepared to<br/> examine the effect of rolling direction on the fracture toughness of JLF-1 steel. Four types of tensile<br/> specimen were also prepared to investigate the property by the rolling direction and welding. The<br/> Micro Vickers hardness was measured at various distances of a cross section of the TIG joints of<br/> JLF-1 steel according to the heating history of each position. Finally, the fracture surface was observed<br/> by scanning electron microscopy (SEM).