• Title/Summary/Keyword: Comparative morphology

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Objective Assessment of Mathematical Morphology Operators to Improve the Accuracy of Background Subtraction for Soccer Videos: An Experimental Comparative Study (축구 동영상의 배경 분리 정확도 향상을 위한 수학적 모폴로지 연산자들의 정량적 비교 평가에 관한 연구)

  • Jung, Chanho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.41 no.12
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    • pp.1752-1755
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    • 2016
  • In this letter, to determine how mathematical morphology operators can be best used to enhance the accuracy of background subtraction for "soccer videos", we conducted an experimental comparative study. We investigated six different mathematical morphology operators under the same experimental setup. We found that the closing by reconstruction-opening by reconstruction is optimal through the experiments using the F-measure. We believe that this comprehensive comparative study serves as a reference point and guide for developers and practitioners in choosing an appropriate mathematical morphology operator adopted for building intelligent soccer video analysis systems.

A Comparative Study of Morphology and Structure related Properties of Saturated Olefinic Thermoplastic Elastomer Blends of EPDM/PP/Oil and SEBS/PP/Oil

  • Sengupta, P.;Sengers, W.G.F.;Gotsis, A.D.;Noordermeer, J.W.M.
    • Elastomers and Composites
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    • v.38 no.1
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    • pp.27-37
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    • 2003
  • This work presents a comparative study of the morphology and structure related properties of thermoplastic elastomer blends based on SEBS/PP/Oil and dynamically vulcanized EPDM/PP/Oil. A combination of ruthenium oxide staining and low voltage scanning electron microscopy (LVSEM) was found to be suitable for the study of morphology of these highly oil extended blends. h close analogy was found in the mechanical, thermal and rheological properties of the two systems made in an internal Brabender mixer and co-rotating turin screw extruder. The morphology of the blends, as made by the two techniques, was found to be significantly different. In the case of TPVs, the blonds made in the extruder had smaller EPDM domains and better tensile properties. In the case of SEBS, the blends made in the Brabender had more co-continuous phases and showed better tensile properties. Crystallization behavior of the isotactic polypropylene in the blends was found to be influenced by the type of rubber. Blends of SEBS/PP crystallized at a lower temperature than the TPVs. These differences were probably caused by differences in the nucleating ability of the two rubbers.

A Comparative Study on the Morphological Characteristics of PAO and dPAO Granule (PAO와 dPAO 입상슬러지의 형태학적 특성에 대한 비교 고찰)

  • Yun, Geumhee;Yun, Zuwhan
    • Journal of Korean Society on Water Environment
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    • v.33 no.3
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    • pp.302-310
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    • 2017
  • The morphological characteristics of granules developing in anaerobic-anoxic (An-Ax) and anaerobic-aerobic (An-Ox) sequencing batch reactors (SBRs) were examined. The granules developed in the both SBRs after 200 days of laboratory operation. The average diameters of the granules were $2.2{\pm}1.7mm$ in the An-Ax SBR and $0.4{\pm}0.3mm$ in the An-Ox SBR. To determine the possible factors affecting morphology of granules a comparative analysis of various operating conditions from reference data indicated that the availability and type of electron acceptors is a key factor determining the granulation process and granular morphology.

Comparative Morphology of Winter Buds in Some Korean Gymnosperms (한국산 나자식물 동아의 비교형태)

  • 선병륜
    • Journal of Plant Biology
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    • v.36 no.2
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    • pp.141-149
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    • 1993
  • Comparative morphology of winter buds of 16 species of gymnosperms which belong to six families and 13 genera was investigated. All the species examined except Taxaceae had bracts and ovuliferous scales in female buds, and the bract was fused with ovuliferous scale in various degrees. Comparison of the modern conifers with fossil ones in the position of ovule and structure of bract-scale complex suggested that Taxaceae should be placed in Coniferales, rather than treating as a distinct order. The disposition of bract surrounding the ovules of Cephalotaxus and Torreya indicated that the origin, of ovules had separate evolutionary line in spite of similar structure of female bud. The shape of microsporophyll in male bud was diverse among the species. The dehiscence of microsporangium was transverse in Abies and Tsuga, while longitudinal in other species. Descriptions and key to the species based on bud morphology were provided.

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A comparative morphological study of Viburnum (Adoxaceae) in Korea

  • CHOI, Yun Gyeong;OH, Sang-Hun
    • Korean Journal of Plant Taxonomy
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    • v.49 no.2
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    • pp.107-117
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    • 2019
  • Viburnum in Korea includes ten species. The phylogenetic relationships and morphology of the genus Viburnum in general have been studied substantially for the past three decades. A clear understanding of the systematic relationships and an assessment of the level of morphological variation of these plants distributed in Korea are lacking. This study investigated the morphology of these species using herbarium specimens and fresh materials obtained during fieldwork to examine the morphological variation level for a better understanding of each species in the genus. A comparative analysis showed that the species of Viburnum in Korea are easily distinguishable based on various characters of the bud, leaf, extrafloral nectary, inflorescence, corolla, fruit, and stone.

Comparative studies on the Hanabusaya asiatica and its allied groups 1. External morphology and anatomical characters (금강초롱꽃 (Hanabusaya asiatica)과 근연분류군의 비교연구 1. 외부형태 및 해부학적 형질)

  • 유기억
    • Korean Journal of Plant Resources
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    • v.8 no.3
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    • pp.223-235
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    • 1995
  • Comparative studies on external morphology and anatomical characters were conducted understand the interspecific relationships and possibly to identify the position of Hanabusaya asiatica as an endemic genus among 4 genera and 9 species in H. asiatica and its allied groups. Such morphological characteristics as root shape, leaf size, presence or absence of wings in petiole, corolla and calyx shape, and inflorescence and stigma shape were useful qualitative characters. The morphology of stem, peduncle, calyx lobe, leaf, petiole, and ovary were also good characters to be included in this identification study. In the anatomical observations in these organs, projecting degree of epidermis and number of projecting area rather than cross-sectioned internal structures were found to be valuable index for the classification among species. External morphology and anatomical characters support the position of H. asiatica as an endemic genus very well. Known as the most important external characters to taxonomists(Fedorov, 1957: Nakai, 1952: Hong, 1983), leaf arrangement, inflorescence, and corolla shape were also preven to be very useful characters to identify the genera and species in the H. asiatica and its allied groups.

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Biosystematic Study on the Genus Viola in Korea - Comparative Morphology of the Viola albida Complex - (한국산 제비꽃속의 종분화론적 연구 - 태백제비꽃군의 비교형태학적 연구 -)

  • 김경식
    • Journal of Plant Biology
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    • v.34 no.3
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    • pp.229-238
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    • 1991
  • The main objective of this study was to clarify the taxonomic status and the speciation mechanism of Viola albida complex in Korea. The complex includes three very closely related taxa, taxonomic ranks of which are much in dispute. These taxa in the complex are sympatric in distribution, and they are very similar in most morphological characteristics. Comparative morphological analyses revealed that they can be distinguished on the basis of leaf shape, although they show complicated patterns of variation in leaf shape. The variation of leaf shape in each taxon appeared to be maintained through developmental process, and extensive cleistogamy and vegetative reproduction in these taxa are suggested as the mechanisms maintaining the variation. Genetic variation in this complex was monomorphic in all 14 loci examined. Palynological study also showed that these taxa have the same pollen morphology. These results strongly suggested that they should be recognized as varieties of V. albida; var, albida, var. chaerophylloides, and var. takahashii. The results also suggested that some individuals that can be assigned to var. takahashii might be hybrids between var. albida and var. chaerophylloides.

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Comparative Morphology of the Weevil Larvae of the Superfamily Curculionoidea in Korea(Coleoptera) (I) (한국산 바구미류 유충의 비교형태에 관한 연구(I))

  • 이찬용
    • Korean journal of applied entomology
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    • v.31 no.2
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    • pp.153-169
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    • 1992
  • This study was made to describe the morphological features of larvae of Pissodes nitidus, Pissodes obscurus, Shirahoshizo insidiosus, Curculio sikkimensis, Cryptorhynchus lapathi of Curculionidae and Apoderus jekeli, Byctiscus puberulus regalis, Euops splendidus, Rhynchites heros of Attelabidae and Siplinus gigas of Rhynchophoridae.

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Comparative studies of the dental morphology textbooks - Focusing on the learning objectives - (학습목표에 따른 치아형태학 교재 내용 비교)

  • Kwon, Soon-Suk
    • Journal of Technologic Dentistry
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    • v.36 no.3
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    • pp.205-217
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    • 2014
  • Purpose: This study will examine the differences among the college dental morphology textbooks in light of their contents and learning objectives through which we will propose an optimal way of consolidating those differences found. Methods: Five college textbooks adopted in the dental related departments were selected by random and the overview and subdivisions of contents were compared and closely analysed with regards to the learning objectives. Results: Firstly, all of the dental morphology textbooks cover the learning objectives of the dental morphology subject, especially in the area of the overview of dental morphology, the permanent tooth, deciduous tooth. Only the dentistry textbooks explain the learning objective of the occlusion. Secondly, differences in content were found in the area of component tissue and around tissue, dental formula of deciduous teeth, spinous process, buccal pit, enamel projection, curve symbol, tip of cusp position of proximal surface of permanent mandibular canines, buccal cusp position of permanent mandibular second premolars. Conclusion: It is imperative to delineate some meaningful and critical differences in contents among the dental morphology textbooks and reflect this to each and every textbook to be published as a supplementary information guide or index.

Comparative Study for the Standardization of Grinding Equipment During Dry Grinding Process by Various Grinding Mills (다양한 매체형 분쇄기를 이용한 건식 분쇄공정에서 장비의 표준화를 위한 분쇄실험의 비교 연구)

  • Bor, Amgalan;Sakuragi, Shiori;Lee, Jehyun;Choi, Heekyu
    • Korean Journal of Materials Research
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    • v.25 no.6
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    • pp.305-316
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    • 2015
  • The study of grinding behavior characteristics on the metal powders has recently gained scientific interest due to their useful applications to enhance advanced nano materials and components. This could significantly improve the property of new mechatronics integrated materials and components. So, a new evaluation method for standardizing grinding equipment and a comparative study for the grinding experiment during the grinding process with various grinding mills were investigated. The series of grinding experiments were carried out by a traditional ball mill, stirred ball mill, and planetary ball mill with various experimental conditions. The relationship between the standardization of equipment and experimental results showed very significant conclusions. Furthermore, the comparative study on the grinding experiment, which investigated changes in particle size, particle morphology, and crystal structure of materials with changes in experimental conditions for grinding equipment, found that the value of particle size distribution is related to the various experimental conditions as a revolution speed of grinding mill and media size.