• Title/Summary/Keyword: biological characteristics

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Nonlinear Time Series Analysis of Biological Chaos (생체 카오스의 비선형 시계열 데이터 분석)

  • 이병채;이명호
    • Journal of Biomedical Engineering Research
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    • v.15 no.3
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    • pp.347-354
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    • 1994
  • This paper describes a diagnostic protocol of nonlinear dynamic characteristics of biological system using chaos theory. An integrated chaos analysis system for the diagnosis of biological system was designed. We suggest a procedure of attractor reconstruction for reliable qualitative and quantitative analysis. The effect of autonomic nervous system activity on heart rate variability with power spectral analysis and its characteristics of chaotic attractors are investigated. The results show the applicability to evaluate the mental and physical conditions using nonlinear characteristics of biological signal.

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A Basic Study on the Variation of Temperature Characteristics for Attenuation Coefficient and Sound Velocity in Biological Tissues

  • Park, Heung-Ho
    • Journal of Biomedical Engineering Research
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    • v.14 no.3
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    • pp.273-282
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    • 1993
  • This study is concerned with the temperature dependence characteristics of ultrasound parameters in biological tissues, which are basic on the noninvasive deep body temperature estimation. Used parameters are ultrasonic attenuation coefficient and sound velocity In order to accomplishment our purpose, several signal processing methods were used. Attenua4iorl coefficient was estimated by spectral difference method and sound velocity was estimated by P-P method. And we also examined these methods through a series of IN VITRO experi mentis that used tissue-mimicking phantom samples and biological tissue samples. In order to imitate the biological soft tissue two kinds of phantom samples are used, one is agar phantom sample which is composed of agar, graphite, N-propyl alcohol and distilled water, and the other is fat phantom sample which is composed of pure animal fat. And the ultrasound transmission mode and reflection mode experiments are performed on the pig's spleen, kidney and fat. As a result, it is found that the temperature characteristics are uniform in case of phan- tom samples but not in biological tissues because of complicate wave propagation within them. Consequently, the possibility of temperature measurement using ultrasound on biological tissue is confirmed and its results may contribute to the establishment of reference values of internal temperature measurement of biological tissues.

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Electro-optical Characteristics of the Degraded Functional Layer in an Alternating- Current Plasma Display Panel

  • Lee, Kyung Ae;Min, Booki;Son, Chang Gil;Byeon, Yong S.;Yoon, Sang Ho;Choi, Eun Ha
    • Applied Science and Convergence Technology
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    • v.24 no.6
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    • pp.232-236
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    • 2015
  • The electro-optical characteristics of several functional layers over the MgO protective layer were studied during the continuous discharge of an AC-PDP. In order to observe the degradation of each functional layer on the MgO protection layer, we measured the surface morphology, cathodoluminescence (CL) spectrum, the secondary electron emission coefficient (${\gamma}$) and the discharge characteristics after 500 hours of discharge during the operation of the AC-PDP.

Characteristics of Six New Bacillus thuringiensis Serovarieties: B. thuringiensis serovar. coreanensis, leesis, konkukian, seoulensis, sooncheon, and yosoo

  • Lee, Kwang-Yong;Kwon, Hyuk-Han;Kang, Eun-Young;Lee, Min-Jung;Kim, Eui-Na;Chu, Dong-Wan;Park, Soo-Il;Ngo, Din-Binh;Lee, Hyung-Hoan
    • Journal of Microbiology and Biotechnology
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    • v.14 no.3
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    • pp.509-514
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    • 2004
  • Six new serovarieties of B. thuringiensis carrying specific H-antigen have minor differences in biochemical characteristics and morphological characteristics of crystals, which are commonly resistant against four antibiotics. The B. thuringiensis serovar. coreanensis is nontoxic to silkworm larvae, but it is moderately toxic against the Culex pipiens larvae. The B. thuringiensis serovar. konkukian and leesis are nontoxic against mosquitos larvae, but are toxic against silkworm larvae. The B. thuringiensis serovar. seoulensis, sooncheon, and yosoo are highly toxic to B. mori larvae and moderately toxic to C. pipiens larvae. The six serovarieties harbor different plasmid DNA patterns. A 102-kDa protein is a major crystal protein in the four serovarieties and a 86-kDa protein is in one serovariety.

Biological Characteristics of Skates(Elasmobranchii: Rajidae)

  • Nakabo, Tetsuji
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • 2000.05a
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    • pp.463-464
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    • 2000
  • Skates are one of the most favorite food fishes for Korean people. It is, I think, important to know the biological characteristics of skates for protecting the fishes from the extinction caused by overfishing. Femily Rajidae encompasses about 200 species which is one fourth of elasmobranch fishes, and 11 species known from the Korean waters. But, very few biological characteristics of skates have been known Some of them are shown here and discussed comparing with those of other elasmobranch fishes (sharks and rays) and teleost fishes. (omitted)

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A Study on the Quantitative Regularity Measures That Are Suitable for Biological Signal Analysis - Standard Data and 24 Hour R-R interval Analysis

  • Nam, Y.H.;Lee, J.M.;Han, J.M.;Park, K.S.
    • Proceedings of the KOSOMBE Conference
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    • v.1998 no.11
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    • pp.197-198
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    • 1998
  • We tested the capability of Pointwise Correlation Dimension(PD2), Approximate Entropy (ApEn) and LZ complexity, as alternative measures of a biological signal. For this purpose, we analyzed standard data and a healthy child's 24-hour heart rate variability. Our conclusion is as follows. First, PD2, ApEn and LZ complexity can be used for discerning chaotic attractor, white noise, and periodic signal. Second, these measures show different characteristics on day and night. Third, these measures can be used for detecting time-varying characteristics of biological signals.

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Evaluation of Impedance on Biological Tissues Using Automatic Control Measurement System (자동제어 측정 시스템을 이용한 생체 조직의 임피던스 평가)

  • Kil, Sang-Hyeong;Lee, Moo-Seok;Kim, Sang-Sik;Shin, Dong-Hoon;Lee, Seong-Mo;Kim, Gun-do;Lee, Jong-Kyu
    • Journal of the Korean Society for Nondestructive Testing
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    • v.35 no.4
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    • pp.239-244
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    • 2015
  • Each biological tissue has endemic electrical characteristics owing to various differences such as those in cellular arrangement or organization form. The endemic electrical characteristics change when any biological change occurs. This work is a preliminary study surveying the changes in the electrical characteristics of biological tissue caused by radiation exposure. For protection aganinst radiation hazards, therefore the electrical characteristics of living tissue were evaluated after development of the automatic control measurement system using LabVIEW. No alteration of biological tissues was observed before and after measurement of the electrical characteristics, and the biblogical tissues exhibited similar patterns. Through repeated measurements using the impedance/gain-phase analyzer, the coefficient of variation was determined as within 10%. The reproducibility impedance phase difference in electrical characteristics of the biological tissue did not change, and the tissue had resistance. The absolute value of impedance decreased constantly in proportion to the frequency. It has become possible to understand the electrical characteristics of biological tissues through the measurements made possible by the use of the developed. automatic control system.

Two New Records of Ascomycetes from Crop Field Soils in Korea

  • Adhikari, Mahesh;Kim, Hyun Seung;Gurung, Sun Kumar;Bazie, Setu;Lee, Hyun Gu;Lee, Hyang Burm;Lee, Youn Su
    • The Korean Journal of Mycology
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    • v.45 no.3
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    • pp.167-174
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    • 2017
  • In the ongoing survey of fungal diversity in Korea, two Ascomycetes species, namely Rhinocladiella similis and Toxicocladosporium irritans, were isolated in 2016. These species were identified based on the internal transcribed spacer region and morphological characteristics. This is the first report of these species in Korea, and the morphological characteristics and images of the fungi are presented.

A New Record of Pseudeurotium bakeri from Crop Field Soil in Korea

  • Adhikari, Mahesh;Kim, Sangwoo;Yadav, Dil Raj;Um, Yong Hyun;Kim, Hyun Seung;Lee, Hyang Burm;Lee, Youn Su
    • The Korean Journal of Mycology
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    • v.44 no.3
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    • pp.145-149
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    • 2016
  • Pseudeurotium bakeri KNU14-21 isolated from crop field soil is a previously unreported fungal species in Korea. This fungal species was identified through morphological and molecular characteristics. Based on the shape and size of conidia and conidiophores as well as the internal transcribed spacer region of rDNA, the isolate was confirmed to be Pseudeurotium bakeri. This species has not been previously reported from Korea, and this is the first report of its incidence in Korea.

Isolation and Characterization of Previously Undescribed Seventeen Fungal Species Belonging to the order Hypocreales in Korea

  • Jaeduk Goh;Yoosun Oh;Young-Hwan Park;Hye Yeon Mun;Sangkyu Park;Wonsu Cheon
    • The Korean Journal of Mycology
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    • v.50 no.1
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    • pp.1-29
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    • 2022
  • Hypocreales is one of the largest orders within the class Sordariomycetes in Ascomycota. Several species of this order are cosmopolitan and have a broad range of habitats. Here, we isolated several fungal strains from environmental samples, including freshwater sediment and plant litter. The strains were identified via molecular and phylogenetic analyses of rDNA and other DNA markers, such as TUB, RPB2, and EF1. The morphological characteristics of the fungi were investigated using microscopy, and culture characteristics were assessed from their growth on several media. We identified 17 species previously unrecorded in Korea: Dactylonectria hordeicola, Flavocillium bifurcatum, Fusarium luffae, Ilyonectria ilicicola, Ilyonectria qitaiheensis, Ilyonectria robusta, Lecanicillium aphanocladii, Nectria ulmicola, Neonectria lugdunensis, Ovicillium oosporum, Pseudonectria foliicola, Sarocladium spinificis, Scolecofusarium ciliatum, Trichoderma appalachiense, Trichoderma subviride, Trichoderma taiwanense, and Trichoderma tsugarense.