• Title, Summary, Keyword: Exploration

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THE FILAMENTARY WEB OF STAR FORMATION

  • White, Glenn J.;Doi, Yasuo;Komugi, Shinya;Kawada, Mitsunobu;Takita, Satoshi;Arimatsu, Ko;Ikeda, Norio;Kato, Daisuke;Kitamura, Yoshimi;Nakagawa, Takao;Ootsubo, Takafumi;Morishima, Takahiro;Hattori, Makoto;Tanaka, Masahiro;Etxaluze, Mireya;Shibai, Hiroshi
    • Publications of The Korean Astronomical Society
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    • v.27 no.4
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    • pp.201-207
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    • 2012
  • Following the first Public Release of the AKARI Point Source catalogues, we have worked on the production of a new far-infrared All-Sky Diffuse mapping product. In this paper we report first results from the All Sky diffuse maps that will shortly be released to the community, based on analysis of data from the Far Infrared Surveyor ($65{\mu}m-160{\mu}m$) instrument. These data are likely to have a strong impact on studies of extended structures, and the diffuse ISM.

An Efficient Architecture Exploration Method for Optimal ASIP Design (Application에 최적의 ASIP 설계를 위한 효율적인 Architecture Exploration 방법)

  • Lee, Sung-Rae;Hwang, Sun-Young
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.9C
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    • pp.913-921
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    • 2007
  • Retargetable compiler which generates executable code for a target processor and performance profiler are required to design a processor optimized for a specific application. This paper presents an architecture exploration methodology based on ADL (Architecture Description Language). We synthesized instruction set and optimized processor structure using information extracted from application program. The information of operation sequences executed frequently and register usage are used for processor optimization. Architecture exploration has been performed for JPEG encoder to show the effectiveness of the system. The ASIP designed using the proposed method shows 1.97 times better performance.

Design Space Exploration for NoC-Style Bus Networks

  • Kim, Jin-Sung;Lee, Jaesung
    • ETRI Journal
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    • v.38 no.6
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    • pp.1240-1249
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    • 2016
  • With the number of IP cores in a multicore system-on-chip increasing to up to tens or hundreds, the role of on-chip interconnection networks is vital. We propose a networks-on-chip-style bus network as a compromise and redefine the exploration problem to find the best IP tiling patterns and communication path combinations. Before solving the problem, we estimate the time complexity and validate the infeasibility of the solution. To reduce the time complexity, we propose two fast exploration algorithms and develop a program to implement these algorithms. The program is executed for several experiments, and the exploration time is reduced to approximately 1/22 and 7/1,200 at the first and second steps of the exploration process, respectively. However, as a trade-off for the time saving, the time cost (TC) of the searched architecture is increased to up to 4.7% and 11.2%, respectively, at each step compared with that of the architecture obtained through full-case exploration. The reduction ratio can be decreased to 1/4,000 by simultaneously applying both the algorithms even though the resulting TC is increased to up to 13.1% when compared with that obtained through full-case exploration.

Are Quasars Growing Fast in the Early Universe?: The Lowest Eddington Ratio Quasar at z~6

  • Kim, Yongjung;Im, Myungshin;Jeon, Yiseul;Kim, Minjin;Hyun, Minhee;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.42 no.2
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    • pp.44.3-45
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    • 2017
  • To date, luminous quasars at z ~ 6 have been found to be in maximal accretion with the Eddington ratios, ${\lambda}Edd$ ~ 1, suggesting enhanced nuclear activities in the early universe. However, this may not be the whole picture of supermassive black hole (SMBH) growth since previous studies have not reached on faint quasars that are more likely to harbor SMBHs with low ${\lambda}Edd$. To understand the accretion activities in quasars at high redshift, we obtained the deep near-infrared (NIR) spectrum of a quasar, IMS J2204+0112, one of the few faintest quasars that have been identified at z ~ 6. From the NIR spectrum, we find that IMS J2204+0112 harbors a SMBH with about a billion solar mass, with ${\log}({\lambda}Edd)=-0.91$. This is the lowest accretion rate found so far for quasars at z ~ 6, but a common value among quasars at z ~ 2. The inclusion of this object in the ${\lambda}Edd$ analysis gives the intrinsic ${\lambda}Edd$ distribution of z ~ 6 quasars, which is lower than previous results that are based on bright quasars, but it is still higher than ${\lambda}Edd$ of z ~ 2 quasars. Although the number statistics needs to be improved in future, the low peak ${\lambda}Edd$ value is consistent with the SMBH growth from a massive black hole seed (~ 105 Msun) or from a stellar mass black hole through short-duration super-Eddington accretion events (${\lambda}Edd$ > 10).

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The Effect of Evaluation on Career Support by the College and Career Exploration Efficacy of Dental Hygiene Students on the Career Exploration Behavior (일부 치위생과 학생의 학교 진로지원 평가와 진로 탐색 효능감이 진로 탐색 행동에 미치는 영향)

  • Jeon, Eun-Suk;Noh, Eun-Mi;Ko, Hyo-Jin
    • Journal of dental hygiene science
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    • v.15 no.5
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    • pp.628-635
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    • 2015
  • For the purpose of investigating the effect of evaluation on career support by the college and career exploration efficacy of dental hygiene students on the career exploration behavior, a survey was conducted in December 2014 with students of dental hygiene at universities located in Ulsan and Daegu as subjects. In the result, correlation was found among sub-factors of evaluation on career support by the college, career exploration efficacy, and career exploration behavior. Increase of career exploration efficacy (${\beta}=0.702$, p<0.001), practical career support (${\beta}=0.165$, p<0.05), and relationship establishment efficacy (${\beta}=0.152$, p<0.05) led to increase of career exploration behavior, while increase of individual exploration efficacy (${\beta}=.0.242$, p<0.001) led to decrease of career exploration efficacy. Therefore, it is necessary to build appropriate value system related to job seeking, conduct active discussions to increase relationship establishment efficacy by using interpersonal relationship reinforcement program, and expand career support program by the college.

Achievements and Tasks of Korea-Japan Geophysical Exploration through Burial mounds Exploration (고분 탐사를 통해 본 한·일 물리탐사의 성과와 과제)

  • Shin, Jong woo
    • MUNHWAJAE Korean Journal of Cultural Heritage Studies
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    • v.48 no.4
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    • pp.74-93
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    • 2015
  • Geophysical survey of Korea was introduced in Nara National Research Institute of Cultural Heritage in 1995. At that time, it has been activated geophysical survey of architecture and civil engineering in Korea. But there was no exploration experts to be combined the archaeology. For this reason, National Research Institute of Cultural Heritage has introduced the physical exploration. Through the expert exchanges South Korea and Japan carried out joint exploration. And it has increased the reliability of the exploration method and exploration results. It is GPR the most method commonly in geophysical exploration. There are many usability before excavation because of good resolution. However, the shallow GPR penetration depth has limitations in large mounds. We were able to take advantage of the resistivity analysis program to study the underground structure to deep through the experts exchange. We was able to get a good result that overcomes the limitations of GPR exploration in a number of burial mounds including Naju bokamri by the resistivity analysis program. In particular, we confirmed the location of the burial main body by compares the results of exploration and excavation results. In the future we will perform a convergence research of exploration and archaeology through a variety of joint research. In addition we will have to build a new network of archaeological science.

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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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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Spin Test of 3D C/SiC Composite Blisk Rotor Model

  • Hashimoto. Ryosaku;Ogawa, Akinori;Sofue, Yahushi;Hojo, Masahiro
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.398-400
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    • 2004
  • The three-dimensional woven fabric C/SiC composites blisk turbine rotor model was evaluated. The spin tests of the blisk model were performed to measure strain distributions at the room temperature. The rotational strength of the blisk model could be improved by the fiber addition. But, there are still more researches to be done.

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