• Title/Summary/Keyword: 어미 현상

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Experimental Study of Excessive Yaw Motion of Turret Moored Floating Body (터렛 계류된 부유체의 과대 선수동요에 관한 실험 연구)

  • Cho, Seok-Kyu;Sung, Hong-Gun;Hong, Jang-Pyo;Choi, Hang-Shoon
    • Journal of the Society of Naval Architects of Korea
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    • v.50 no.1
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    • pp.8-13
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    • 2013
  • Excessive yaw motion of a turret moored vessel was examined in this paper. The vessel was moored by an internal turret and catenary mooring lines. The experiments were conducted in regular waves. Turret moored vessel can oscillate from side to side or move to one particular direction, and eventually exhibit large yaw motion. The results showed that the excessive yaw occured for specific condition, ratio of wave lengths and vessel length. It was found that turret moored floating vessel was unstable for regular wave period from 14 to 18 sec and excessive yaw occurred to maximum 50 deg. The time series, trajectory, phase plot and qualitative analysis are performed. The analysis showed that the results of experiments agreed with the that of analytic method and the excessive yaw could be predicted by the stability analysis.

A REVISED CATALOGUE OF METEOR OUTBURSTS IN KOREAN, JAPANESE, CHINESE HISTORIES (한국, 일본, 중국의 역사 기록에 나오는 별똥만발 기록의 새로 고친 목록)

  • Ahn, Sang-Hyeon
    • Journal of Astronomy and Space Sciences
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    • v.22 no.3
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    • pp.293-310
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    • 2005
  • We made a revised catalogue for reliable records of meteor outbursts that were recorded in Korean, Japanese, and Chinese chronicles. In order to avoid the effects of both Earth's precession and perihelion shift, we introduced a new time-coordinate of records, or the number of days elapsed within the sidereal year of the record for a given origin of time or the perihelion passage time of the you 2000. We added nineteen new records of meteor showers that are wrongly classified i, individual meteors in a Chinese archive. We found that the ${\eta}-Aquarids,$ the Perseids, the Orionids, and the Leonids have been active during the last two millennia. Due to the change of time-coordinate, the oldest record of each long-lasting meteor shower has been slightly corrected. We discuss that these long-lasting meteor showers belong to the Halley-type comets.

Nondestructive Evaluation and Microfailure Mechanisms of Single Fibers/Brittle Cement Matrix Composites using Electro-Micromechanical Technique and Acoustic Emission (Electro-Micromechanical 시험법과 Acoustic Emission을 이용한 단섬유/시멘트 복합재료의 미세파괴 메커니즘과 비파괴적 평가)

  • 박종만;이상일;김진원;윤동진
    • Composites Research
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    • v.14 no.3
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    • pp.18-31
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    • 2001
  • Interfacial and microfailure properties of the modified steel, carbon and glass fibers/cement composites were investigated using electro-pullout test under tensile and compressive tests with acoustic emission (AE). The hand-sanded steel composite exhibited higher interfacial shear strength (IFSS) than the untreated and even neoalkoxy zirconate (Zr) treated steel fiber composites. This might be due to the enhanced mechanical interlocking, compared to possible hydrogen or covalent bonds. During curing process, the contact resistivity decreased rapidly at the initial stage and then showed a level-off. Comparing to the untreated case, the contact resistivity of either Zr-treated or hand-sanded steel fiber composites increased to the infinity at latter stage. The number of AE signals of hand-sanded steel fiber composite was much more than those of the untreated and Zr-treated cases due to many interlayer failure signals. AE waveforms for pullout and frictional signals of the hand-sanded composite are larger than those of the untreated case. For dual matrix composite (DMC), AE energy and waveform under compressive loading were much higher and larger than those under tensile loading, due to brittle but well-enduring ceramic nature against compressive stress. Vertical multicrack exhibits fur glass fiber composite under tensile test, whereas buckling failure appeared under compressive loading. Electro-micromechanical technique with AE can be used as an efficient nondestructive (NDT) method to evaluate the interfacial and microfailure mechanisms for conductive fibers/brittle and nontransparent cement composites.

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A Case Study on the Preservation Treatment of Ancient Documents -Focusing on the "Keumganggyung-samgahae" from the Four Devas of Borimsa, Buddhist Temple at Jangheung County- (고문헌의 보존처리에 관한 사례연구 -장흥 보림사 사천왕상에서 발견된 『금강경삼가해』를 중심으로 -)

  • Roh Ki-Chun
    • Journal of Korean Library and Information Science Society
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    • v.35 no.3
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    • pp.79-94
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    • 2004
  • This research studied the preservation treatment of the papered literature the national treasure 745-9 $\ulcorner$Keumganggyung-samgahae$\lrcorner$, discovered in 1995 from the Four Devas of Borimsa Buddhist Temple at Jangheung County, in the viewpoint of the bibliography. The overall features of the $\ulcorner$Keumganggyung-samgahae$\lrcorner$ were of 25.3cm width, 38.9cm height 1.5cm depth, 58 pages and of high-fine yellow-brown colored reef paper. The book was ruined physically in the shape and color. The covers of the book were deeply stained by the permeated rain and some internal pages were changing into brown color by corrosion. The treatment policies were; maintaining the status quo and capable repeated treatment. And the preservation treatment was done in the sequences of 1) 1st cleaning process, 2) repairing and correcting, 3) 2nd cleaning and preservation 4) cutting, binding the book and making the envelope and wood box. The post-preservation features of $\ulcorner$Keumganggyung-samgahae$\lrcorner$ were; total 64 pages and the size being 25.8 cm width 39.4cm of lenght, and 1.9cm of depth.

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태양계의 물: 기원과 진화

  • Choe, Byeon-Gak;Choe, Hye-Rim
    • 한국지구과학회:학술대회논문집
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    • 2005.09a
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    • pp.3-8
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    • 2005
  • 지구는 현재 태양계에서 액체 상태의 물이 표면에 존재하는 유일한 천체이다. 하지만, 고체 또는 기체 상태의 물은 태양계의 다른 행성이나, 위성, 소행성, 혜성 등에도 풍부하게 존재하고 있다. 풍부한 액체 상태의 물은 지구 표면에서 일어나고 있는 기후의 변화, 해류의 이동, 퇴적 및 침식 작용, 화산활동과 같은 여러 지구과학적 현상에 밀접하게 관여하고 있을 뿐 아니라 생명의 탄생과 진화에도 매우 중요한 역할을 하였다. 현재 지구 표면에 액체 상태의 물이 존재할 수 있는 이유는 태양으로부터의 거리, 지구의 조성 및 크기 등과 관련된 지구 표면의 물리-화학적 조건이 액체 상태의 물이 존재할 수 있는 조건과 일치하고 있기 때문이다. 이와는 달리 지구보다 태양에 더 가깝게 위치하고 있고, 두터운 이산화탄소 대기를 갖고 있어 표면의 온도가 매우 높은 금성의 경우 H2O는 기체 상태로 존재하며, 지구보다 더 멀리 떨어져 있고 희박한 대기를 갖고 있는 화성의 경우에는 현재 H2O가 고체 즉 얼음의 형태로 존재한다. 태양계를 탄생시킨 태양계 성운에서는 압력이 너무 낮아 액체 상태의 물이 존재할 수 없으며, 고온에서는 기체 상태로 매우 낮은 저온에서는 얼음의 형태, 또는 함수 광물 내에 포함되어 존재할 수 있다. 지구와 같은 규모의 행성은 비교적 중력이 작아 태양계 성운의 기체를 거의 끌어들이지 못했다. 따라서 현재 지구에 존재하는 물은 대부분은 고체 상태로 지구에 집적되었을 것이다. 하지만 지구가 탄생한 위치에서 초기 태양계의 온도는 얼음이 형성되기에는 너무 높았기 때문에 좀 더 먼 곳에서(현재의 목성 위치보다 바깥쪽)에서 생성된 얼음 즉, 혜성이 태양계 안쪽으로 들어와 지구에 물을 공급했거나 함수광물을 포함하고 있는 소행성(예를 들어 CI chondrites와 같은 조성의)이 물을 가져왔을 것으로 생각되고 있다.서의 활성화는 어미 변환과 관련된 영역이라기보다는 산출시 관련되는 articulation, motor coordinate관련 영역으로 추정되고, 측두엽의 활성화는 형태소, 의미 관련 지식의 data base로 추정된다. 또한 우반구 전두엽 부분에서 관찰된 활성화는 억제관련 영역으로 짐작된다.러한 동물실험이 그 기초를 제공해 줄 수 있을 것이다. 또한 행동성향 및 기억의 종류에 따른 약물효과의 차이는 기억과 관련된 질병인 알츠하이머 환자에 있어 개개인에게 맞는 적절한 특징적인 치료약물이 존재할 것이라는 가능성을 제공해줄 뿐만 아니라 학습과 기억력 증진 효과를 기대해 볼 수 있을 것이라고 생각된다. 및 지역산업발전의 기획${\sim}$조정기구로서, 선진국의 지역발전기구(Regional Development Agency : RDA)인 지역전략산업기획단이 2002년도부터 산업자원부와 9개 시도에 의해 설립되어 지역네트워크의 활성화와 클러스터의 형성 촉진을 하게 되었고 2004년도에는 13개시도로 확대${\sim}$운영되고 있고, 지역특화사업(H/W)과 지역산업기술개발과제(S/W)와 함께 패케지 형태로 지원되며, 주요역할은 크게 지역산업의 정책기획 분야와 평가관리, 지역혁신역량 조사 및 DB구축 등으로 구분된다. 그중에서도 권역별, 지역별, 지역산업진흥사업 육성과 중장기 산업발전계획을 수립하기 위하여 지역혁신역량을 바탕으로 한 지역 Technology Road Map(TRM)작성사업은 전국공통의 1단계 사업으로 실시 ?榮쨉?, 2005년 3월 기준으로 9개 지역(강원, 대전, 충남, 충북, 경북, 울산, 전남, 전북, 제주) 26개 산업분야를 대상으로 23개가 완료된 상황이다. 이를 근거로 한 지역정책과 R&D 과제 및 필요 인프라의 도출이 체계적으로 구축되어 지역산업 발전을 위한

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A Study on the Publication of Liudao Pushuo, One of Mengshan De-yi's Works (몽산(蒙山) 덕이(德異)의 『몽산화상육도보설(蒙山和尙六道普說)』 판본고(板本考))

  • Song, Il-Gie;Kim, Eun-Jin
    • Journal of the Korean Society for Library and Information Science
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    • v.45 no.3
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    • pp.207-233
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    • 2011
  • This thesis is a study of the printed books of Liudao Pushuo(六道普說), one of Mengshan(蒙山)'s works. Mengshan De-yi(德異) lived in the Song(宋) and Yuan(元) Dynasty and was a Buddhist monk of Linji Chan(臨濟宗). Liudao Pushuo exists only in Korea, and there is no copy in China. Liudao Pushuo is a summary of the preachings of Mengshan about the Ten dharma-worlds(十法界) which include the six realms(六道) and the four kinds of holy men(四聖). There are 22 printed books in Korea. This study analyzed their physical descriptions and structures. As a result, all the printed books have 'sajudanbyoun(四周單邊)' except one book that is 'julchopjang(折帖裝)' of 'Bulgapsa(佛甲寺)'. There are also ten books with 'Heukku(黑口) and naehyang heukumi(內向黑魚尾)'. This indicates that those were typical of the printing type of the early days of the Joseon(朝鮮) Dynasty. In addition, the books with 13 characters in one line(13字本) were common. All 22 printed books were published in the $15^{th}$ and 16th century. This study confirms that Liudao Pushuo was handed down in the Goryeo(高麗) from China and actively published in the 15th and 16th century. This shows that Mengshan's Seon(禪) had a significant effect on Buddhism in Korea.

Effect of DEHP Administration on Reproduction in Pregnant Mice Ⅰ. Effect of DEHP Administration on Reproductive Characteristic and Blood Hematological Values in Pregnant Mice (임신중인 생쥐에 DEHP 투여가 번식현상에 미치는 영향 Ⅰ. 임신중인 생쥐에 DEHP 투여가 분만 후 번식특성과 혈액성분에 미치는 영향)

  • Park, Dong-Heon;Jang, Hyun-Yong;Park, Choon-Keun;Cheong, Hee-Tae;Kim, Choung-Ik;Yang, Boo-Keun
    • Development and Reproduction
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    • v.8 no.2
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    • pp.85-89
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    • 2004
  • This study is illustrated that 1) the effects of DEHP administration on body weight, sex ratio and litter size on 19 days in the prenatal period 2) the effects of reproductive organ weight and blood hematological values on 25 days postpartum in pregnant mice. DEHP was administrated to pregnant mice by intraperitoneal injection at 0, 0.5, 1.0 and 10.0mg/kg B.W from day 1 to day 16 in the gestation period with 5 times at 3 days interval. There were no significantly differences in the material body weight, litter size and sex ratio on 19 days in the prenatal period. The body weight of the fatal male mice was slightly lower in 1.0 and 10.0mg DEHP groups than in any other groups. The reproductive organ weight and hematological values in dam mice on 25 days postpartum were not affected by DEHP administration. The histological evaluation of ovary in dam mice on 25 days after dilivery was not different in all experimental groups, but the endometriosis and edema of uterus in dam mice were significantly decreased in 0.5mg DEHP group than that of control group.These results indicate that the administration of low concentration of DEHP was not affected on reproductive characteristic and blood hematological values in pregnant mice.

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A study on the method of deriving the cause of social issues based on causal sentences (인과관계문형 기반 사회이슈 발생원인 도출 방법 연구)

  • Lee, Namyeon;Lee, Jae Hyung
    • Journal of Digital Convergence
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    • v.19 no.3
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    • pp.167-176
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    • 2021
  • With development of big data analysis technology, many studies to find social issues using texts mining techniques have been conducted. In order to derive social issues, previous studies performed in a way that collects a large amount of text data from news or SNS, and then analyzes issues based on text mining techniques such as topic modeling and terms network analysis. Social issues are the results of various social phenomena and factors. However, since previous studies focused on deriving social issues that are results of various causes, there are limitations to revealing the cause of the issues. In order to effectively respond to social issues, it is necessary not only to derive social issues, but also to be able to identify the causes of social issues. In this study, in order to overcome these limitations, we proposed a method of deriving the factors that cause social issues from texts related to social issues based on the theory of part of Korean linguistics. To do this, we collected news data related to social issues for three years from 2017 to 2019 and proposed a methodology to find causes based causal sentences based on text mining techniques.

Study on the Physiology of Optimal reproductive age in Korean Native Cattle (한우의 최적 번식적령기의 생리적 현상에 관한 연구)

  • Seong, H.H.;Lee, J.H.
    • Journal of Practical Agriculture & Fisheries Research
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    • v.4 no.1
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    • pp.110-118
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    • 2002
  • This study was conducted to investigate the physiology of optimal reproductive age in Hanwoo for protection to decrease of reproductivity and improvement of production of offspring. Thirty two cows were devided into 4 groups of treatments : T1(12 months of age and 0.5kg daily gain), T2(12 months of age and 0.8kg daily gain), T3(15 months of age and 0.5kg daily gain) and T4(18 months of age and 0.5kg daily gain). The days of the first heat of treated cows were 263.3±6.4 days and average weight was 181.1±11.3kg. The conception rates of first insemination were 25%(T1) and 75%(T4), and the number of insemination of T3 and T4(both 1.5) was lower than those of T1 and T2(2.3 and 2.4), respectively. With regard to estrus return after the first parturition, T1, T2, T3 and T4 showed 66.2,76.7, 62.4 and 68.5 days, respectively, indicating the average days of estrus return was 65.7. Plasma progesterone(P4) concentration was nearly the same during the observation periods of treated cows and P4 began to be detected after 12months. Only 5(15.6%) out of 32cows showed normal estrus cycle and ovulation before 12 months. During the peri-parturition period, P4 concentration was rapidly decreased and there was no detection of P4 from parturition to 40 days after milking. P4 would be released again on 45 day after parturition. The results imply that the optimal reproductive age of Hanwoo heifers would be around at the 14 months of age, 110cm height and 265kg weight.