• Title, Summary, Keyword: Exploration

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Graphing Calculator's Impact on Students' Exploration in Senior High School

  • Li Shiqi;Shi Hongliang
    • Research in Mathematical Education
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    • v.10 no.1
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    • pp.79-87
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    • 2006
  • In this paper we investigated the influence on school students when they use graphing calculator for exploration, including their experience of exploration, their ability and attitudes. After using graphing calculator based mathematics exploration course, two students were interviewed and 162 students who finished the course in these years were investigated. The results show that graphing calculator is a useful tool to develop students' explorative ability. Most of students had positive attitudes to and were interested in making use of graphing calculator.

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Geophysical exploration techniques, used in geotechnical and engineering markets in Korea, Japan, and U.S.A. (지반환경조사에 주로 사용되는 지구물리탐사기법 -한국, 일본, 미국-)

  • Won, Kyung-Sik
    • Journal of the Korean Geophysical Society
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    • v.5 no.3
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    • pp.247-268
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    • 2002
  • The various geophysical exploration techniques, which are currently employed in Korea, are investigated in terms of the survey specifications used in the geotechnical and engineeringl markets in Korea, Japan, and USA.

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Survey of Faint Quasar candidates at 4.7 ≤ z ≤ 5.2

  • Shin, Suhyun;Im, Myungshin;Kim, Yongjung;Hyun, Minhee;Park, Woojin;Ji, Tae-geun;Jeon, Yiseul;Kim, Minjin;Kim, Dohyeong;Kim, Jae-Woo;Taak, Yoon Chan;Yoon, Yongmin;Choi, Changsu;Hong, Jueun;Jun, Hyunsung David;Karouzos, Marios;Kim, Duho;Kim, Ji Hoon;Lee, Seong-Kook;Pak, Soojong;Park, Won-Kee
    • The Bulletin of The Korean Astronomical Society
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    • v.43 no.1
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    • pp.59.4-60
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    • 2018
  • To investigate the impact of the high-redshift quasars on cosmic reionization, the faint end slope of the quasars luminosity function has to be determined precisely. More quasars with low luminosity are needed to constrain the contribution to reionization in the early universe. However, finding these quasars has been regarded as tough process owing to the improper shallow depth of imaging data. In recent days, the release data of Subaru Hyper Suprime-Cam (HSC) Strategic Program survey which provide the deep images reaching ~ 25 mag facilitates searching the faint quasars candidates. To find faint quasar candidates in ELAIS-N1 field, along with the HSC data, two near-infrared (NIR) data sets also be used : The Infrared Medium-deep Survey (IMS) and The UKIRT Infrared Deep Sky Survey (UKIDSS) - Deep Extragalactic Survey (DXS). Quasar candidates selected from the multi-band color cut were observed by the SED camera for QUasars in EArly uNiverse (SQUEAN) instrument. To trace the redshifted Lyman break efficiently, appropriate medium bands comparable to targeted redshift range are chosen. The most reliable quasar candidates are finally determined through SED fitting. Using this less luminous quasars candidates, we can speculate the relation between the quasar growth and the host galaxy unbiasedly and estimate the contribution to the cosmic reionization.

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APPLICATION OF SIR-C DATA FOR EXPLORATION OF MINERALIZEDD ZONES (HWANGGANG-Rl, KOREA)

  • Jiang, Wei W.;Park, S.W.;Park, Jeong-Ho;Lee, Cahng-Won;Kim, Duk-Jin;So, Byung-Han;So, C. S.;Moon, Wooil M.
    • Proceedings of the KSRS Conference
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    • pp.158-164
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    • 1999
  • This paper investigated and evaluated the NASA's Shuttle Imaging Radar-C (SIR-C) multiple frequency SAR data for differential backscattering effects of microwave from the surface geological materials overlying the skarn type mineralization. Although an integrated approach in mineral exploration is more cost effective and is well in use, there are still many technical and scientific issues to be further investigated and researched. In this study we have reprocessed several sets of previously surveyed exploration data and experimented with fuzzy logic digital fusion of the preprocessed data with respect to chosen exploration targets. Among the numerous fuzzy logic operators, which are currently available for a data driven integrated exploration strategy, we used varying combinations of fuzzy MIN, fuzzy MAX, and fuzzy SUM operators along with Gamma operator for fusion of exploration data, including the contact metamorphic zone information. The final exploration target tested was a skarn type W-Mo-F mineralization in the study area. The fuzzy logic derived mineral potential anomaly almost exactly matched the differential backscattering anomalies on the C-band and L-band SIR_C data when overlaid on each other. Although this high degree of correlation between these two data sets is remarkable, the differential backscattering anomaly over the skarn type W-Mo-F mineralization in the study area requires further investigation.

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Antecedents of Exploration Activities: Focused on Internal Ffactors (탐험활동의 선행요인: 기업 내부특성을 중심으로)

  • Lee, Hyo Jin;Huh, Moon-Goo
    • Journal of Technology Innovation
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    • v.22 no.2
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    • pp.105-129
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    • 2014
  • In order to identify the antecedents of organization's exploration activities, this study focuses on internal factors. There are many theoretical and empirical studies for an organization's exploration activities, while the research on antecedents is limited. This study is aimed at the manufacturing industry in Korea from 1998 to 2012 using data from 15 years of slack, ownership structure, and TMT diversity. The study examined the impact of these firm-specific factors on firm's exploration activities. As a result, a company's exploration activities and slack have positive relationship. Between insider ownership and exploration activities, the hypothesis was not supported. Also, the relationship between TMT diversity and exploration activities was dismissed. Finally, based on the results of this analysis, the contribution of this study, limitations and implications are drawn.

Optical follow-up observation of three binary black hole merger events with the KMTNet.

  • Kim, Joonho;Im, Myungshin;Paek, Gregory S.H.;Lee, Chung-Uk;Kim, Seung-Lee;Choi, Changsu;Lim, Gu;Lee, Hyung Mok;Kim, Sophia;Hwang, Sungyong
    • The Bulletin of The Korean Astronomical Society
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    • v.44 no.2
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    • pp.76.1-76.1
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    • 2019
  • After the first identification of electromagnetic counterpart of gravitational wave source (GW170817), era of multi-messenger astronomy has begun. For specifying coordinate, magnitude, and host galaxy information, optical follow-up observation of GW source becomes important. The O3 run of LIGO / VIRGO started after April 2019. We present searching strategy of GW optical counterpart using the KMTNet. By performing tiling observation of high probability area in GW localization map, we expect to observe early light-curve of GW optical counterpart. We will also present observation result for three gravitational wave events of binary black hole mergers. After identification of optical counterpart, we will study collision mechanism, progenitor, and characteristics of host galaxy using observation data of GW source.

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Development Status of Domestic & Overseas Space Exploration & Associated Technology (국내외 우주탐사 프로그램 및 관련 기술의 개발현황)

  • Ju, Gwanghyeok
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.44 no.8
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    • pp.741-757
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    • 2016
  • Over 60 years has passed since mankinds started space exploration beyond the Earth with lunar explorer Luna 1 launched by Soviet Union. Unprecedently remarkable outcomes have been obtained by sending unmanned spacecrafts to most planets in the solar system and having the lander landed on the approaching comet toward the Earth even though any evidence of life presence has not been discovered yet. Only moon is an natural object beyond the earth on which human beings landed. Many countries are planning to send humans to the moon or mars to build colonies and to survive with substantiality. Korean lunar exploration program has officially started as of 2016 after its plan including lunar exploration has been specified in the series of National Space Promotion Plan since Korea initiated space development in early 1990s. In this paper, the plan for Korean space exploration is summarized with reviewing overseas space exploration program status and trends.

Analysis of effectiveness of solar system internet to deep space exploration (태양계 인터넷이 심우주 탐사에 미치는 영향 분석)

  • Koo, Cheolhea;Kim, Changkyun;Rew, Dongyoung;Choi, Gihyuk
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.44 no.3
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    • pp.240-246
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    • 2016
  • The hottest news and achievements of space science and research in recent years may be NASA Curiosity rover's exploration (2013) of Mars, China Chang'e 3's exploration (2013) of Moon, ESA Rosetta's exploration (2014) of Comet 67P/Churyumov-Gerasimenko, and NASA New Horizons' exploration (2015) of Pluto, which are very astonishing achievement since such a deep space journey was possible with current technology. In contrast the wonderful cruise and navigation technologies evolution of explorer in deep space, there are no remarkable changes in deep space data communication, it is still in conservative area, of which much changes are reluctantly accepted so far. But there are some movements of deep space exploration in order to allow ground brilliant technologies to deep space. One of those experiments is internet, whose main topic of this paper. In this paper, we will present the analysis of effectiveness of solar system internet to deep space exploration.