• Title/Summary/Keyword: Eclipse

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A Technique for Component-Based Development (CBD) using Eclipse Platform (Eclipse 플랫폼을 이용한 컴포넌트 기반 개발 (CBD) 기법)

  • Kim, Seong-An;La, Hyun-Jung;Kim, Soo-Dong
    • Proceedings of the Korean Information Science Society Conference
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    • pp.310-312
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    • 2005
  • 컴포넌트 기반 개발 (CBD) 기술은 재사용을 통해 개발 노력과 시간을 줄여주는 기술로서 학계에서 활발한 연구가 이루어지고 있으며, 산업계의 기본 개발 패러다임으로 자리잡고 있다. 한편, 개방형 소프트웨어로 개발된 도구 및 어플리케이션 개발 통합 환경인 Eclipse 플랫폼이 각광 받고 있으며 Eclipse 플랫폼은 플러그인의 조립이라는 형태로 구성된다. Eclipse 플러그인은 큰 재사용 단위를 가지고 조림을 통해 구성되는 CBD의 컴포넌트와 비슷한 특성을 갖는다. 기존의 부족한 특정 플랫폼 기반의 컴포넌트 설계 및 구현 지침에 관한 연구를 Eclipse 플랫폼 기반의 CBD 기법을 연구함으로써 해결할 수 있을 것이다. 따라서, Eclipse 의 플러그인에 기반한 CBD 개발 기법에 대한 연구가 필요하다. 본 논문에서는 CBD 기술과 Eclipse 플랫폼에 대해서 알아보고 CBD 플랫폼과 컴포넌트의 요구사항을 분석하고 이러한 요구사항들이 어떠한 기법을 통하여 Eclipse 플랫폼에 적용 가능한지에 대해 알아본다. 끝으로 기존의 CBD 플랫폼에서의 개발과 비교하여 Eclipse 플랫폼을 사용함으로써 얻을 수 있는 장점에 대해서 알아본다.

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Effects on Meteorological Variables During the Partial Solar Eclipse Event of 22 July 2009 in Korea (2009년 7월 22일 부분일식 발생 시 기상요소의 변화 특성)

  • Jeon, Byung-Il
    • Journal of Environmental Science International
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    • v.20 no.8
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    • pp.1041-1048
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    • 2011
  • The purpose of this study was to analyze the effects on meteorological variables in Seoul, Busan and Jeju during the partial solar eclipse event of 22 July 2009 in Korea. Solar irradiance decreased 16 and 19 minutes after eclipse in Seoul and Busan, and 6 minutes before eclipse in Jeju. Minimum solar irradiance occurred 7 and 3 minutes after maximum eclipse in Seoul and Busan, respectively, and 8 minutes before maximum eclipse in Jeju. Solar irradiance began to increase after maximum eclipse in Seoul and Busan, and recovered to the original state as eclipse ended. On the other hand, recovery of solar irradiance after maximum eclipse in Jeju was slower than those of two cities. Temperature drop due to partial solar eclipse were $0.7^{\circ}C$, $4.0^{\circ}C$, $1.5^{\circ}C$ in Seoul, Busan, and Jeju, respectively, and time needed to arrive minimum temperature from maximum eclipse were each 12, 32, 30 minutes, respectively. Change of relative humidity during partial solar eclipse were 2.6%, 17.4%, 12.3% in Seoul, Busan, and Jeju, respectively. Temperature drop turned out to be sharper as altitude increases. Wind speed decreased by each about 1.1 m/s, 3.4 ms/s, 1.4 ms/s due to partial solar eclipse in Seoul, Busan, and Jeju. Soil temperature of 5 cm equally decreased by $0.2^{\circ}C$ in Seoul and Busan, soil temperature of 10 cm maintained almost constant, and soil temperature of 20 cm was hardly affected by eclipse.

ANALYSIS OF THE LUNAR ECLIPSE RECORDS FROM THE GORYEOSA

  • LEE, KI-WON;MIHN, BYEONG-HEE;AHN, YOUNG SOOK;AHN, SANG-HYEON
    • Journal of The Korean Astronomical Society
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    • v.49 no.4
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    • pp.163-173
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    • 2016
  • In this paper, we study the lunar eclipse records in the Goryeosa (History of the Goryeo Dynasty), an official history book of the Goryeo dynasty (A.D. 918 - 1392). In the history book, a total of 228 lunar eclipse accounts are recorded, covering the period from 1009 to 1392. However, we find that two accounts are duplications and four accounts correspond to no known lunar eclipses around the dates. For the remaining lunar eclipses, we calculate the magnitude and the time of the eclipse at different phases using the DE406 ephemeris. Of the 222 lunar eclipse accounts, we find that the minimum penumbral magnitude was 0.5583. For eclipses which occurred after midnight, we find that some accounts were recorded on the day before the eclipse, like the astronomical records of the Joseonwangjosillok (Annals of the Joseon Dynasty), while others were on the day of the lunar eclipse. We also find that four accounts show a difference in the Julian dates between this study and that of Ahn et al., even though it is assumed that the Goryeo court did not change the dates in the accounts for lunar eclipses that occurred after midnight. With regard to the contents of the lunar eclipse accounts, we confirm that the accounts recorded as total eclipses are accurate, except for two accounts. However, both eclipses were very close to the total eclipse. We also confirm that all predicted lunar eclipses did occur, although one eclipse happened two days after the predicted date. In conclusion, we believe that this study is very helpful for investigating the lunar eclipse accounts of other periods in Korea, and furthermore, useful for verifying the calendar dates of the Goryeo dynasty.

GEOMAGNETIC FIELD VARIATIONS DURING SOLAR ECLIPSES AND THE GEOGRAPHIC LOCATION OF OBSERVING SITES

  • Kim, Jung-Hee;Chang, Heon-Young
    • Journal of The Korean Astronomical Society
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    • v.51 no.4
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    • pp.119-127
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    • 2018
  • We examine whether the solar eclipse effect is dependent on the geographic conditions under which the geomagnetic field variations are recorded. We concentrate our attention on the dependence of the solar eclipse effect on a number of factors, including, the magnitude of a solar eclipse (defined as the fraction of the angular diameter of the Sun being eclipsed), the magnetic latitude of the observatory, the duration of the observed solar eclipse at the given geomagnetic observatory, and the location of the geomagnetic observatory in the path of the Moon's shadow. We analyze an average of the 207 geomagnetic field variation data sets observed by 100 INTERMAGNET geomagnetic nodes, during the period from 1991 to 2016. As a result, it is demonstrated that (1) the solar eclipse effect on the geomagnetic field, i.e., an increase in the Y component and decreases in the X, Z and F componenets, becomes more distinct as the magnitude of solar eclipse increases, (2) the solar eclipse effect is most conspicuous when the modulus of the magnetic latitude is between $30^{\circ}$ and $50^{\circ}$, (3) the more slowly Moon's shadow passes the geomagnetic observatory, the more clear the solar eclipse effect, (4) the geomagnetic observatory located in the latter half of the path of Moon's shadow with respect to the position of the greatest eclipse is likely to observe a more clear signal. Finally, we conclude by stressing the importance of our findings.

THE SOLAR ECLIPSE PREDICTIONS OF CHILEONGSAN-OEPYEON IN EARLY CHOSEON (조선 초기 칠정산 외편의 일식 계산)

  • Ahn, Young-Sook;Lee, Yong-Sam
    • Journal of Astronomy and Space Sciences
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    • v.21 no.4
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    • pp.493-504
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    • 2004
  • The history books of East Asia about astronomical phenomena have the more records of the solar eclipse frequently than any other ones. It is because traditionally, the solar eclipse moaned the fate of dynasty and the king's rule. The Sun, the biggest thing in the heaven symbolized the king, and the solar eclipse foresaw that the king had the problem in private including the body, and the country might suffer from difficulties in a great scale. So the king and all of the ministers used to gather to hold a ceremony named Gusikrye(구식례) which solar eclipse may pass safely. Consequently, kings always had concernments on collecting informations of solar eclipse. Inspite of importance of solar eclipse predictions, but at the beginning of the Choseon, the predictions of the solar eclipse didn't fit. King Sejong compiled the Chiljeongsan-naepion (칠정산내편) and the Chiljeongsan-oepyeon(칠정산외편) to calculate the celestial phenomena including the solar eclipse. By the publications of these two books, the calendar making system of Choseon was firmly established. The Chiljeongsan-oepyeon adopted Huihui calendar(회회력) of Arabia. The Solar eclipse predictions of Chiljeongsan-oepyeon were relative correct compared to modern method in early Choseon dynasty.

Development of the Virtual Test Path for Eclipse-II, A Parallel Mechanism Motion Simulator (병렬구조 모션 시뮬레이터 이클립스-II 를 위한 가상현실 시험경로 개발)

  • 인우성;김종원
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.965-968
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    • 2004
  • This paper describes the development of the test path for Eclipse-II, a parallel mechanism motion simulator. Eclipse-II which can be used as a base for general motion simulators, enables unlimited continuous 360-degree spinning in any rotational axes plus finite X, Y, and Z translation motions. The advantage of enabling continuous 360-degree spinning allows various motions for virtual reality. In this paper, the development of the test path to verify the robustness of the Eclipse-II motion simulator is described. The test motions, which satisfy the requirements of test path, are suggested and washout filter enables these motions reproduced in the limited workspace. The trial run is conducted to verify the robustness of the Eclipse-II motion simulator. Additionally the standard data format of virtual reality for Eclipse-II One Man Ride is suggested.

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A SCANNING CCD DETECTOR FOR SOLAR ECLIPSE OBSERVATIONS

  • YERSHOV V. N.
    • Journal of The Korean Astronomical Society
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    • v.29 no.spc1
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    • pp.385-386
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    • 1996
  • A wide-field CCD detector for solar eclipse observations is discussed. The CCD is supposed to be of a moderate size, and the image of the corona is obtained by scanning the field of view. Results of the 1995 solar eclipse observation are shown which have been made with a prototype of the scanning CCD detector.

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Characteristics on variation of meterological variables during the partial solar eclipse event of 21 May 2012 in Busan (2012년 5월 21일 부분일식 발생 시 부산지역 기상요소의 변화 특성)

  • Jeon, Byung-Il;Kim, Il-Gon
    • Journal of Environmental Science International
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    • v.22 no.7
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    • pp.885-893
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    • 2013
  • The purpose of this study was to analyze the effects of partial solar eclipse on 21 May 2012 in Korea on meteorological variables in Busan. 0800 LST(Local Standard Time) solar radiation was similar or lower than 0700 LST solar radiation, and sunshine duration decreased by 0.2~0.5 hours in Busan and great cities under the influence of the partial solar eclipse. Temperature drop due to the partial solar eclipse was $0.2{\sim}2.0^{\circ}C$, time taken to arrive at maximum temperature after onset of eclipse was 8~62 minutes, and time taken to arrive at minimum temperature after maximum eclipse was -9~17 minutes in Busan. Change of wind speed was negligible as partial solar eclipse occurred in the morning. Soil temperature of 5 cm was minute as well, the increase of soil temperature due to sunset was delayed by more than 1 hour.

A Possibility of Modulating the Geomagnetic Field by the Solar Eclipse

  • Kim, Jung-Hee;Chang, Heon-Young
    • The Bulletin of The Korean Astronomical Society
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    • v.41 no.2
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    • pp.68.1-68.1
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    • 2016
  • The solar eclipse affects terrestrial environments in various aspects. For instance, it is well known that the electron concentration and current density decrease in the ionosphere due to the reduction of solar irradiation during solar eclipse. In this study, we carry out the statistical analysis of x, y, z, H-components, and the intensity of the geomagnetic field using the ground based geomagnetic data observed during the solar eclipses from 1991 to 2016. First, we confirm that characteristic decreases in the x and H-components can be seen in the vicinity of the maximum eclipse time at the observing site. Second, we find that the decrease in x and H-components is more conspicuous during the total solar eclipse rather than the partial or annular eclipses. We also find that such a dip is likely to be noticed when the observing site locates in the second half compared to the first half of the eclipse path, as well as when the eclipse occurs in dusk side than in dawn side. Third, we find that reductions in the ground geomagnetic field by the solar eclipse are more evident in the ascending phase of the solar cycle than in the descending phase. Finally, we briefly discuss implications of our findings.

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Swarm Satellite Observations of the 21 August 2017 Solar Eclipse

  • Hussien, Fayrouz;Ghamry, Essam;Fathy, Adel;Mahrous, Salah
    • Journal of Astronomy and Space Sciences
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    • v.37 no.1
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    • pp.29-34
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    • 2020
  • On 21 August 2017, during 16:49 UT and 20:02 UT period, a total solar eclipse started. The totality shadow occurred over the United States in time between ~17:15 UT and ~18:47 UT. When the solar radiation is blocked by the moon, observations of the ionospheric parameters will be important in the space weather community. Fortunately, during this eclipse, two Swarm satellites (A and C) flied at about 445 km through lunar penumbra at local noon of United States in the upper ionosphere. In this work, we investigate the effect of the solar eclipse on electron density, slant total electron content (STEC) and electron temperature using data from Swarm mission over United States. We use calibrated measurements of plasma density and electron temperature. Our results indicate that: (1) the electron density and STEC have a significant depletion associated with the eclipse; which could be due to dominance of dissociative recombination over photoionization caused by the reduction of ionizing extreme ultraviolet (EUV) radiation during the eclipse time (2) the electron temperature decreases, compared with a reference day, by up to ~150 K; which could be due to the decrease in photoelectron heating from reduced photoionization.