• Title/Summary/Keyword: 18-03

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RADIO ASTRONOMY AT WRC-03

  • Chung, Hyun-Soo;Ahn, Do-Seob;Park, Jong-Min;Oh, Dae-Sub;Kim, Hyo-Ryoung;Rho, Duk-Gyoo;Je, Do-Heung
    • Publications of The Korean Astronomical Society
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    • v.18 no.1
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    • pp.111-133
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    • 2003
  • Most radio astronomy issues at WRC-03 (World Radiocommunication Conference-03) revolved around satellite downlink allocations, particularly to NGSO (Non-Geostationary Satellite Orbit) satellite systems, in bands adjacent to or close to a radio astronomy frequency band. Out of a total of 50 agenda items, ten were of interest to radio astronomers. This paper provides some details about the important outcome of the radio astronomy related issues at the WRC-03.

Endophytic Fungal Diversity Associated with the Roots of Coastal Sand-dune Plants in the Sindu-ri Coastal Sand Dune, Korea (신두리 해안사구에 자생하는 사구식물 내생진균의 다양성 분석)

  • You, Young-Hyun;Seo, Yeonggyo;Yoon, Hyeokjun;Kim, Hyun;Kim, Ye-Eun;Khalmuratova, Irina;Rim, Soon-Ok;Kim, Changmu;Kim, Jong-Guk
    • Microbiology and Biotechnology Letters
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    • v.41 no.3
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    • pp.300-310
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    • 2013
  • The coastal sand-dune plants of eight species; Argusia sibirica, Calystegia soldanella, Elymus mollis, Lithospermum zollingeri, Raphanus sativus, Salsola collina, Zoysia macrostachya, and Zoysia sinica were collected from the Shindu-ri coastal sand dune. Ninety-eight endophytic fungal strains were isolated from the roots of these plants, analyzed, and identified by sequences in their internal transcribed spacers (ITS) at the ITS1, 5.8S, and ITS2 regions. The diversity of endophytic fungi isolated from coastal sand-dune plants was confirmed with various diversity indices. The fungal strains belonged to thirteen orders: Capnodiales (3.09%), Eurotiales (70.10%), Glomerellales (1.03%), Helotiales (3.09%), Hypocreales (9.28%), Mortierellales (2.06%), Onygenales (1.03%), Ophiostomatales (1.03%), Pleosporales (1.03%), Polyporales (1.03%), Russulales (1.03%), Saccharomycetales (2.06%), and Xylariales (1.03%). Of the endophytic fungal strains collected, Penicillium (59.18% in Eurotiales) and Fusarium (5.10% in Hypocreales) were the most abundant in coastal sand-dune plants. The endophytic fungal strains isolated from C. soldanella were more diverse compared to strains from the other coastal sand-dune plants.

Usefulness of $^{18}F$-FDG PET/CT in Locoregional Recurrence of Differentiated Thyroid Cancer: Comparison PET/CT to PET and Neck Ultrasonography for Biopsy-proven Lesions (갑상선유두암 재발 진단에서 $^{18}F$-FDG PET/CT와 경부초음파검사 병용의 유용성: PET, 경부초음파검사 그리고 혈청 티로글로불린 (thyroglobulin)의 비교)

  • Kim, Kun-Ho;Shong, Min-Ho;Seo, Young-Duk;Kim, Seong-Min
    • Nuclear Medicine and Molecular Imaging
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    • v.43 no.5
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    • pp.411-420
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    • 2009
  • Purpose: The aim of this study was to investigate the usefulness of $^{18}F$-FDG PET/CT with neck ultrasonography (neck US) in patients with recurrent, papillary thyroid cancer. Material and methods: This retrospective study (December 2006 to April 2008) enrolled sixty-one patients (ninety-one lesions) who underwent high-dose $^{131}I$-ablation therapy after total thyroidectomy, and evaluated recurred papillary thyroid cancer. All lesions were confirmed by histopathology and compared histopathologic findings to PET, PET/CT, and neck US findings. Results: In sixty-one patients (57 women, 4 men; age range, 24-81 years, mean 49 years; 61 papillary carcinomas), the sensitivity, specificity, accuracy of $^{18}F$-FDG PET/CT was 87.2%, 64.0%, 78.1% on a patient basis and 92.3%, 66.7%, 80.9% on a lesion basis, respectively. The sensitivity, specificity, accuracy of $^{18}F$-FDG PET was 71.8% (p=0.03), 59.0% (p=1.00), 67.2% (p=0.03) on a patient basis and 78.8% (p<0.01), 64.1% (p=1.00), 72.5% (p=0.02) on a lesion basis, respectively. The sensitivity, specificity, accuracy of neck US was 71.1% (p=0.07), 52.2% (p=0.75), 63.9% (p=0.05) on a patient basis and 71.2% (p<0.01), 61.5% (p=1.00), 67.0% (p=0.06) on a lesion basis, respectively. Combined $^{18}F$-FDG PET/CT with neck US improved the sensitivity, specificity, accuracy to 94.7% (p=0.50), 82.6% (p=0.13), 90.2% (p=0.03) on a patient basis and 96.2% (p=0.50), 89.7% (p<0.01), 93.4% (p<0.01) on a lesion basis, respectively. Conclusion: $^{18}F$-FDG PET/CT demonstrated significantly higher sensitivity than neck US for the detection of recurred papillary thyroid cancer lesions. Furthermore, combined $^{18}F$-FDG PET/CT with neck US showed more improved sensitivity, specificity, accuracy for diagnosis of recurrent papillary thyroid cancer.

순서와 위상구조의 관계

  • 홍성사;홍영희
    • Journal for History of Mathematics
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    • v.10 no.1
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    • pp.19-32
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    • 1997
  • This paper deals with the relationship between the order structure and topological structure in the historical point of view. We first investigate how the order structure has developed along with the set theory and logic in the second half of the nineteenth century. After the general topology has emerged in the beginning of the twentieth century, two disciplines of the order theory and topology give each other a great deal of effect for their development via various dualities, compactifications by maximal filter spaces and Alexandroff's specialization order, which form eventually a fundamental setting for the development of the category theory or functor theory.

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Spectrophotometric Study of the Complex Formation of Ferric Ion with Xylenol Orange (Fe(III)와 Xylenol Orange의 착물형성에 대한 분광광도법적 연구)

  • O Tae Sub;Lee Sun Haing;Park Jung Hag
    • Journal of the Korean Chemical Society
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    • v.22 no.5
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    • pp.311-316
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    • 1978
  • The reaction between iron(III) and Xylenol Orange (XO or $H_6A$) has been investigated spectrophotometrically. It has been established that iron (III) and XO form two complexes with compositions iron(III) : XO = 2 : 1 and 1 : 1. The 2 : 1 complex is stable in acidic medium containing excess of iron, and 1 : 1 complex is stable in slightly acidic medium containing excess of XO. The absorption maxima are at 590 nm (2 : 1) and 500 nm (1 : 1), the molar absorptivities being $3.18{\pm}0.04{\times}10^4,\;1.32{\pm}0.03{\times}10^4$respectively. The stability constants of two complexes studied by varying pH are $loglog{\beta}_{21}=18.69{\pm}0.03,\;log{\beta}_{212}=42.08{\pm}0.09,\;log{\beta}_{11}=4.17{\pm}0.04,\;and\;log{\beta}_{113}=34.47{\pm}0.07.$

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THE PROTECT10N OF PASSIVE SERVICES FROM UNWANTED EMISSIONS, IN PARTICULAR FROM SPACE SERVICE TRANSMISSION (불요발사 (우주업무의 발사)로부터 수동업무의 보호)

  • Chung, Hyun-Soo;;Je, Do-Heung;Park, Jong-Min;Kim, Hyo-Ryoung;Ahn, Do-Seob;Oh, Dae-Sub
    • Publications of The Korean Astronomical Society
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    • v.18 no.1
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    • pp.97-110
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    • 2003
  • WRC-03 was held between 9 June and 4 July 2003 in Geneva, Switzerland. Over 2,200 delegates from 138 ITU Member States attended the Conference. The delegates considered some 2,500 proposals, and over 900 numbered documents related to 50 agenda items. The final output of the Conference consists of 527 pages of new and revised text of the Radio Regulations. This paper provides some details about the outcome of the radio astronomy related issues at the WRC-03 Conference. It is divided into two part: a) Agenda item1.8.2 and b) Agenda item 1.32, related to radio astronomy. Relevant extracts from the Final Acts of WRC-03 are given in the Appendix. Agenda item 1.8.2 was one of the most controversial Agenda Items at WRC-03. Studies were carried out within ITU-R TG 1/7 for the last three years; the results of these studies are summarized in Recommendation ITU-R SM.1633. The Conference adopted a new footnote (5.347A), that calls for the application of Resolution 739 (WRC-03) in the 1452-1492 MHz, 1525-1559 MHz, 1613.8-1626.5 MHz, 2655-2670 MHz, 2670-2690 MHz and 21.4-22.0 GHz bands. Agenda item 1.32 is to consider technical and reglatory provisions concerning the band 37.5-43.5 GHz, in accordance with Resolutions 128 (Rev.WRC-2000) and 84 (WRC-2000). WRC-03 reviewed and adjusted the New footnotes 5.551H and 5.551I cover the protection of radio astronomy observations in the 42.5-43.5 GHz band from unwanted emissions by non-geostationary (5.551H) and geostationary (5.551I) FSS and BSS systems, respectively.

Axenic Culture of Gyrodinium impudicum Strain KG03, a Marine Red-tide Microalga that Produces Exopolysaccharide

  • Yim Joung Han;Lee Hong Kum
    • Journal of Microbiology
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    • v.42 no.4
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    • pp.305-314
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    • 2004
  • An exopolysaccharide-producing microalgal dinoflagellate was isolated from a red-tide bloom and des­ignated strain KG03. A bacteria-free culture of strain KG03 was achieved using a modified wash with phototaxis and antibiotic treatment. Combined treatment with neomycin and cephalosporin was the most effective for eliminating the bacteria associated with the microalgae. Strain KG03 was identified as Gyrodinium impudicum by analyzing the ITS regions of the 5.8S rDNA, 18S rDNA, morphological phenotype and fatty acid composition. The exopolysaccharide production and cell growth in a 300-ml photobioreactor were increased 2.7- and 2.4-fold, respectively, compared with that in a flask culture at the first isolation step.