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Earthquake time-frequency analysis using a new compatible wavelet function family

  • Moghaddam, Amir Bazrafshan;Bagheripour, Mohammad H.
    • Earthquakes and Structures
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    • v.3 no.6
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    • pp.839-852
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    • 2012
  • Earthquake records are often analyzed in various earthquake engineering problems, making time-frequency analysis for such records of primary concern. The best tool for such analysis appears to be based on wavelet functions; selection of which is not an easy task and is commonly carried through trial and error process. Furthermore, often a particular wavelet is adopted for analysis of various earthquakes irrespective of record's prime characteristics, e.g. wave's magnitude. A wavelet constructed based on records' characteristics may yield a more accurate solution and more efficient solution procedure in time-frequency analysis. In this study, a low-pass reconstruction filter is obtained for each earthquake record based on multi-resolution decomposition technique; the filter is then assigned to be the normalized version of the last approximation component with respect to its magnitude. The scaling and wavelet functions are computed using two-scale relations. The calculated wavelets are highly efficient in decomposing the original records as compared to other commonly used wavelets such as Daubechies2 wavelet. The method is further advantageous since it enables one to decompose the original record in such a way that a clear time-frequency resolution is obtained.

First record of two erotylid species of Triplax (Coleoptera: Erotylidae: Tritomini) from Korea

  • Jung, Boo Hee;Park, Haechul
    • Journal of Species Research
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    • v.6 no.3
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    • pp.291-294
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    • 2017
  • Two fungivorous Korean erotylid beetles-Triplax ainonia Lewis, 1887 and Triplax nagaoi Nakane, 1977 in the tribe Tritomini-were recorded for the first time from Korea. All Korean Triplax members are associated with the fruiting bodies of higher fungi and fungus-grown bark. Re-description, key to the species of Korean Triplax, photographs of adults, and line drawings of diagnostic characters and host fungi records are provided.

First records of the genera Tillus and Elasmocylidrus (Coleoptera: Cleridae) in Korea, with Tillus elongatus (Linnaeus, 1758) and Elasmocylidrus takedaorum Murakami and Gerstmeier, 2020

  • JUNG, Boo Hee
    • International Journal of Industrial Entomology and Biomaterials
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    • v.43 no.1
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    • pp.1-5
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    • 2021
  • Two genera of the family Cleridae, Tillus Olivier, 1790 and Elasmocylidrus Corporaal, 1939 and two species, Tillus elongatus (Linnaeus, 1758) and Elasmocylidrus takedaorum Murakami and Gerstmeier, 2020 are reported for the first time in Korea. Illustrations of a habitus, diagnostic characteristics of the genus and species are presented with key to the korean genera of subfamily Tillinae.

Two New Records of Dexaminidae (Crustacea: Amphipoda) from Korea

  • Kim, Young-Hyo;Eun, Ye;Lee, Kyung-Sook
    • Animal Systematics, Evolution and Diversity
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    • v.22 no.1
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    • pp.37-49
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    • 2006
  • Two species of the family Dexaminidae, Paradexamine fraudatrix Tzvetkova, 1976 and Paradexamine gigas Hirayama, 1984 are newly recorded from the Korean fauna. They are redescribed and figured in detail. The genus Paradexamine is reported from Korea for the first time.

Two New Records of the Genus Arboridia Zachvatkin (Hemiptera: Auchenorrhyncha: Cicadellidae: Typhlocybinae) from Korea (한국산 두점박이애매미충속 (노린재목: 매미충과: 애매미충아과)의 한국 미기록 2종의 기재)

  • Oh, Sumin;Kim, Il-Kwon;Kim, Ki-Kyeong;Seo, Hong-Yul;Chae, Joon-Seok;Jung, Sunghoon
    • Korean journal of applied entomology
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    • v.54 no.1
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    • pp.47-50
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    • 2015
  • Two newly recorded species of the genus Arboridia Zachvatkin (Hemiptera: Auchenorrhyncha: Cicadellidae: Typhlocybinae) from Korea are reported, which are Arboridia lunula Song & Li, 2013 and Arboridia agrillacea (Anufriev, 1969). Photographs of dorsal habitus, illustrations of male genitalia, abdomens and forewings and distributional records are provided. In addition, a key to the Korean Arboridia species is also given.

An Efficient XML Query Processing Method using Path Containment Relationships (경로 포함 관계를 이용한 효율적인 XML 질의 처리기법)

  • 민경섭;김형주
    • Journal of KIISE:Databases
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    • v.31 no.2
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    • pp.183-194
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    • 2004
  • As XML is a do facto standard for a data exchange language, there have been several researches on efficient processing XML queries. The most important thing to consider when processing XML queries is how efficiently we can process path expressions in queries. Some previous works make results by performing a sequence of join operations on all records corresponding to labels in the path expression. Others works check the existence of paths in the query using an RDBMS's string comparison operator and make results by extracting the records corresponding to the paths. In this paper we suggested a new query planning algorithm based on path containment relationships and two join operators supporting the planning algorithm. The join operators use only the records related to the paths in a query as input data, scan them only once, and generate result data using a pipelining mechanism. By analysis and experiments, we confirmed that our techniques(a new query planning algorithm and two join operators) achieved significantly higher performance than other previous works.

New records to the Korean soil dwelling Mesostigmata fauna (Acari)

  • Kontschan, Jeno;Jeon, Mi Jeong;Hwang, Jeong Mi;Seo, Hong Yul
    • Journal of Species Research
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    • v.4 no.1
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    • pp.33-44
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    • 2015
  • A total of 34 species belonging to 11 families and 21 genera in the Order Mestostigmata are reported from the Korean Peninsula, of which 20/34 species are new for the fauna of the Korean Peninsula (Lasioseius furcisetus Athias-Henriot, 1959, Cheiroseius nepalensis Evans & Hyatt, 1960, Cheiroseius curtipes (Halbert, 1923), Hypoaspis imitatus Reitblat, 1963, Hypoaspis presternalis Willmann, 1949, Hypoaspis kargi Costa, 1968, Pseudoparasitus placentulus (Berlese, 1887), Gamasiphis novipulchellus Ma & Yin, 1998, Parholaspulus bregetovaae Alexandrov, 1965, Parholaspulus paradichaetes Petrova, 1967, Neparholaspis arcuatus Petrova, 1977, Neparholaspus simplex Evans, 1956, Parholaspulus excentricus Petrova, 1967, Gamasholapis asiaticus Petrova, 1967, Veigaia carpillaris Tseng, 1994, Veigaia anmashanensis Tseng, 1994, Leptogamasus bicorniger Witalinski, 1977, Neogamasus insignis (Holzman, 1969), Iphidinychus kakumeiensis Hiramatsu & Hirschmann, 1992, Trigonuropoda sanguinea Hirschmann & Hiramatsu, 1977). A total of 19 of the previously unreported species were collected in soil samples from the Democratic People's Republic of Korea (DPRK), while 13 species were collected from soil samples from the Republic of Korea (ROK). Only two species were found in both the DPRK and the ROK. Illustrations and short descriptions for previously unreported species provided.

Two New Records of Smittinids (Bryozoa: Gymnolaemata: Cheilostomata) from Korea (한국산 입이끼벌레류 (태형동물문 나후강: 순구목)의 2미기록종)

  • Seo Ji Eun;Gong Yong-Hak
    • Animal Systematics, Evolution and Diversity
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    • v.21 no.2
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    • pp.219-225
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    • 2005
  • Two smittinid species, Pleurocodonellina signata and Smittina torques, are new to Korean bryozoan fauna. Smittina elongata recorded as a new species from Japan is synonymized with Pleurocodonellina signata, and Smittina torques has been reported only from Hew Zealand so far. The genus Pleurocodonellina is recorded in Korean waters for the first time.

Two New Records of Crangonid Shrimps (Crustacea: Decapoda: Caridea) in Korean Waters

  • Kim, Jung-Nyun;Choi, Jung-Hwa;Choi, Kwang-Ho;Kim, Sung-Tae;Chang, Dae-Soo
    • Animal Systematics, Evolution and Diversity
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    • v.24 no.3
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    • pp.265-268
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    • 2008
  • Two crangonid shrimps, Paracrangon abei Kubo, 1937 and Pontocaris sibogae (De Man, 1918), collected from the northeastern and southeastern waters of Jeju Island, are newly recorded into the Korean fauna. The former is the second species and the latter is the only species of each genus recorded in Korea. Morphological and distributional accounts of these two species are briefly discussed.

Aquatic Beetles Fauna in Nohwa and Bogil Islands, and Copelatus parallelus (Coleoptera: Dytiscidae) and Scirtes sobrinus (Coleoptera: Scirtidae) New to South Korea

  • Jung, Sang Woo;Min, Hong Ki;Lee, Dae-Hyun
    • Animal Systematics, Evolution and Diversity
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    • v.36 no.2
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    • pp.128-138
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    • 2020
  • A faunistic list and distribution of aquatic beetles were given with two newly records, Copelatus parallelus Zimmermann, 1920 (family Dytiscidae) and Scirtes sobrinus Lewis, 1895 (family Scirtidae) from Nohwa and Bogil islands in South Korea. As a result, a total of 30 species belonging to 24 genera and eight families were recognized: 12 Dytiscidae species, eight Hydrophilidae species, three Haliplidae species, two Scirtidae species, two Gyrinidae species, one Noteridae species, one Elmidae species, and one Psephenidae species. Composition and habitus photographs of all collected aquatic beetles, habitats, and the diagnostic characters of C. parallelus and S. sobrinus are provided.