• 제목/요약/키워드: SecB

검색결과 641건 처리시간 0.025초

레슬링 선수들의 단기간 체중감량이 슬관절의 등속성 운동능력에 미치는 영향 (The Changes of Isokinetic Strength in Accordance with Short-term Weight loss of Wrestlers)

  • 염종우
    • 생명과학회지
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    • 제12권6호
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    • pp.780-785
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    • 2002
  • 본 연구는 고교 레슬링선수들의 단기간 체중감량에 따른 등속성 운동능력 중 다리의 peak torque, peak torque %BW, total work, total work %BW, endurance ratio에 대한 변화를 알아보기 위하여 자기 체중에서 체중감량이 없는 집단 7명, 5%이상 감량집단 7명을 대상으로 체중감량 전ㆍ후를 측정하여 얻은 결론은 다음과 같다. 1. Peak Torque의 변화. 굴근의 경우 5%이상 감량 집단의 $60^{\circ}C$sec, $90^{\circ}C$/sec에서 유의하게 감소하였다. 그리고 신근의 경우 5%이상 감량 집단의 $60^{\circ}C$/sec, $90^{\circ}C$/sec, $250^{\circ}C$/sec에서 모두 유의하게 감소하였다. 2. Peak Torque %BW의 변화. 굴근의 경우 5%이상 감량 집단의 60$^{\circ}$/sec, 90$^{\circ}$/sec, $150^{\circ}C$/sec에서 모두 유의하게 감소하였다. 그리고 신근의 경우 5%이상 감량 집단의 $90^{\circ}C$/sec와 $250^{\circ}C$/sec에서 유의하게 감소하였다. 3. Total Work의 변화. 굴근의 경우 5%이상 감량 집단의 $60^{\circ}C$/sec,$90^{\circ}C$/sec에서 유의하게 감소하였다. 그리고 신근의 경우 5%이상 감량집단의 $50^{\circ}C$/sec, $90^{\circ}C$/sec. $250^{\circ}C$/sec에서 모두 유의하게 감소하였다. 4. Total work %BW의 변화. 굴근의 경우 5%이상 감량 집단의 $60^{\circ}C$/sec, $90^{\circ}C$/sec, $250^{\circ}C$/sec에서 유의하게 감소하였다. 그리고 신근의 경우 5%이상 감량 집단의 $50^{\circ}C$/sec, $90^{\circ}C$/sec, $250^{\circ}C$/sec에서 모두 유의하게 감소하였다. 5. Endurance Ratio의 변화. 굴근과 신근의 경우 두 집단 모두 유의한 차이가 없었다. 단기간의 무리한 체중감량은 근력, 근지구력의 저하로 경기력을 저하시킬 뿐만 아니라 건강을 해칠 우려가 있기 때문에 단기간의 무리한 감량이 되지 않도록 과학적이고 체계적인 체중관리가 이루어져야 할 것으로 사료된다.

Melt-spun $Nd_{14}Fe_{80}B_6$ 리본합금의 자기적 특성분석 (Analysis of magnetic properties for the melt-spun $Nd_{14}Fe_{80}B_6$ ribbon alloy)

  • 정강섭;성학제;김건한;박윤창;서수정;이경섭
    • 분석과학
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    • 제8권3호
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    • pp.341-350
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    • 1995
  • Melt-spinning법을 이용하여 $Nd_{14}Fe_{80}B_6$ 조성의 리본합금을 제조하고 각 제조조건별 시편에 대한 자기적 특성을 분석하였다. 리본합금의 미세구조와 자기적 특성은 냉각속도 및 열처리 조건에 민감하게 변화하였다. As-quenched 상태의 경우 wheel 속도 20m/sec에서 가장 좋은 자기적 특성을 나타내었으며, 비정질 상태의 리본시편에 대한 열처리 효과는 22m/sec에서 제조된 리본시편을 $600^{\circ}C$에서 30분간 진공열처리하였을 때 가장 좋은 결과를 얻을 수 있었다. 또한 $Nd_2Fe_{14}B$상의 결정화 온도는 DTA 분석결과 $595^{\circ}C$ 부근이었다.

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플라즈마 화학기상 증착법에 의해 증착된 B이 첨가된 ZnO 박막의 전기적 특성 (Electrical Properties of B-doped ZnO Thin Films deposited by Plasma Enhanced Chemical Vapor Deposition)

  • 최준영;조해석;김영진;이용의;김형준
    • 한국진공학회지
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    • 제4권1호
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    • pp.85-90
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    • 1995
  • 본 연구에서는 투명 전극으로의 응용을 목적으로 PECVD법에 의해 증착된 B이 첨가된 ZnO 박막의 전기 및 광학적 특성을 살펴보았다. B을 첨가하지 않은 ZnO 박막은 비저항이 수 $\Omega$-cm 정도의 값을 가지고 있었으며 시간에 따른 비저항의 변화가 컸으나, 2% B2H6을 5-16sccm의 유량범위에서 첨가한 경우에는 5-9X10-2 $\Omega$-cm의 비저항을 가지고 시간 경과에 따른 비저항의 변화가 아주 작은 ZnO 박막을 얻을 수 있었다. Van der Pauw법에 의한 Hall 계수의 측정 결과에 의하면, B을 첨가하지 않은 ZnO 박막의 전자 농도는 1017/㎤정도였으나 B을 첨가함으로써 최고 1020/㎤까지 증가하였다. 그러나 B이 첨가되기 전에는 박막의 전하 나르게 이동도가 $4extrm{cm}^2$/V.sec 이었으나, B참가에 의해 $0.7\textrm{cm}^2$/V.sec 이하로 감소하였다. B을 첨가한 경우와 첨가하지 않은 경우의 ZnO 박막은 모두 가시광성영역에서 90%이상의 광투과율을 가지고 있었으며, B을 첨가한 경우는 전자농도가 증가함에 따라 광학적 밴드 갭이 3.3eV로부터 3.55eV로 증가하는 거동을 보였다.

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연직배수공법에 있어서 제강슬래그의 재활용을 위한 투수성 연구 (Considerations of Permeability of Converter Slag for Recycling in vertical drainage method)

  • 이광찬;정규향;김영남;이문수
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2000년도 연약지반처리위원회 학술세미나
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    • pp.93-112
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    • 2000
  • The permeability of converter slag, replacing material of sand mat on improving soft clay foundation, was evaluated in the laboratory. The effects of grain size, flow water time and aging were investigated using sea and fresh water. Converter slag being submerged with fresh water, the coefficients of permeability in A and B samples less than 10mm grain sizes were measured as 6.52${\times}$10$\^$-2/cm/sec and 5.99${\times}$10$\^$-1/cm/sec, while changed as 1.88${\times}$10$\^$-2/cm/sec, 3.86${\times}$10$\^$-1/cm/sec under sea water condition. Also, the condition of turbulent flow may exit and was experimentally identified from the relationship between hydraulic gradient and seepage velocity. After 180 days on using sea water, the coefficients of permeability of sample A and B samples decreased ten times smaller than those initial values. And after that time continually decreased as for till 360 days. The reduction of permeability coefficient was considered to influence filled with voids in high-calcium quicklime(CaO). However, in-situ coefficient of permeability was practically satisfactory.

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연직배수공법에 있어서 제강슬래그의 재활용을 위한 투수성 연구 (Considerations of Permeability of Converter Slag for Recycling in vertical drainage method)

  • 이광찬;정규향;김영남;이문수
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 2000년도 연약지반처리위원회 학술세미나
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    • pp.12-31
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    • 2000
  • The permeability of converter slag, replacing material of sand mat on improving soft clay foundation, was evaluated in the laboratory. The effects of grain size, flow water time and aging were investigated using sea and fresh water. Converter slag being submerged with fresh water, the coefficients of permeability in A and B samples less than 10mm grain sizes were measured as 6.52${\times}$10$\^$-2/cm/sec and 5,99${\times}$10$\^$-1/cm/sec, while changed as 1,88${\times}$10$\^$-2/cm/sec, 3.86${\times}$10$\^$-1/cm/sec under sea water condition. Also, the condition of turbulent flow may exit and was experimentally identified from the relationship between hydraulic gradient and seepage velocity. After 180 days on using sea water, the coefficients of permeability of sample A and B samples decreased ten times smaller than those initial values. And after that time continually decreased as for till 360 days. The reduction of permeability coefficient was considered to influence filled with voids in high-calcium quicklime(CaO). However, in-situ coefficient of permeability was practically satisfactory.

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Transcriptional Features of the Chromosomal Region Located between the sigH and rplA Genes of Bacillus subtilis

  • Jeong, Sang-Min
    • Biotechnology and Bioprocess Engineering:BBE
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    • 제11권2호
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    • pp.168-172
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    • 2006
  • In this study. the transcriptional features of a 2.8 kb region spanning the sigH and rplA genes of Bacillus subtilis were clarified using synthetic oligonucleotides complementary to the transcripts of the rpmG, secE, nusG, and rplK genes. The 5' ends of three transcripts corresponding to this region were located and mapped on the chromosome via primer extension analysis. Three regions, designated Prg, Pn, and Prk, which partially share the consensus sequence recognized by ${\sigma}^A$ RNA polymerase, were theorized to function as promoter elements. The rpmG and secE genes of B. subtilis were cotranscribed from the designated prg promoter, whereas the nusG and rplK genes were transcribed separately from the Pn and Prk promoters, respectively. Accordingly, the transcriptional features, as well as the gene organization, of the region encompassing the sigH and rplA genes of B. subtilis, including the rpmG-secE-nusG-rplK genes, were determined to be distinct from those of Escherichia coli. Divergences in terms of gene organization and transcriptional features within the relevant region would serve as excellent criteria for the delineation of phylogenetic relationships among bacteria.

광도에 따른 담배와 인삼엽의 광합성 능력의 차이 (Differences of Photosynthetic Ability of Tobacco and Ginseng Leaves in Accordance with Light Intensity)

  • 황종규;현동윤
    • 한국작물학회지
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    • 제34권2호
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    • pp.211-219
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    • 1989
  • 담배와 인삼은 광강도에 따라 반응이 다르게 나타났다. $CO_2$ 흡수량과 RuBPCase 활성은 담배의 경우 1900 $\mu$ E m$^{-2}$ sec$^{-1}$에서 높았고 인삼은 500 $\mu$ E m$^{-2}$ sec$^{-1}$에서 높았다. 담배와 인삼의 $CO_2$ 흡수량과 RuBPCase 활성의 차이는 담배가 3.7배, 2.7배 각각 높았다. $CO_2$ 흡수량과 RuBPCase 활성과의 상관은 담배에서 고도의 정의 상관이 인정되었으나 인삼은 부의 상관이 인정되는 경향이었다. Glycolate oxidase 와 Malate dehydrogenase 활성은 담배의 경우 1,900 $\mu$ E m$^{-2}$ sec$^{-1}$에서 높았고, 인삼은 1000 $\mu$ E m$^{-2}$ sec$^{-1}$에서 높았다. 담배의 Nitrate reductase 활성은 광조건이 1900 $\mu$ E m$^{-2}$ sec$^{-1}$가 500 $\mu$ E m$^{-2}$ sec$^{-1}$보다 2배 높았으나 인삼은 광처리구 모두 Nitrate reductase 활성을 검출할 수 없었다. 단백질함량과 엽록소함량은 담배가 인삼보다 적정 광구에서 2.2배, 1.5배 각각 높았다. 엽록소 a/b의 비율은 담배의 경우 500 $\mu$ E m$^{-2}$ sec$^{-1}$에서 낮았고 인삼은 1000 $\mu$ E m$^{-2}$ sec$^{-1}$에서 낮았다. 단백질함량과 엽록소함량과의 관계는 담배에서 고도의 정상관이었고 인삼은 500 $\mu$ E m$^{-2}$ sec$^{-1}$에서 처리 후 5일에 부상관이 인정되었다. 단백질조성은 담배와 인삼이 상이하였지만 주 band의 분자량은 담배와 인삼 모두 50KD과 15KD으로 비슷하였다. 이들은 처리 후 시기가 지나면 희미해졌으며 담배는 500 $\mu$ E m$^{-2}$ sec$^{-1}$에서 인삼은 1000 $\mu$ E m$^{-2}$ sec$^{-1}$에서 47KD이었다.

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근접장 발파진동에서 진동속도와 진동레벨의 비교 (The Vibration Velocity and Vibration Level of Near-field Blasting Vibration in an Urban Blasting Site)

  • 이연수;장서일
    • 한국소음진동공학회논문집
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    • 제15권8호
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    • pp.918-923
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    • 2005
  • The vibration level (dB(V)) and vibration velocity (cm/sec) on the ground and buildings due to the differences of the measuring sites from the blasting source was investigated. To compare with vibration level and vibration velocity theirs magnitude was not surely directly proportional and vibration velocity 0.1 cm/sec was $45\~50$ dB(V). The difference between the measured vibration level and the calculated vibration level by Ejima's equation using vibration velocity PVS(peak vector sum) showed $21.0\~30.9$ dB(V) on the ground, $15.3\~23.6$ dB(V) on the apartment, respectively. And the correlation of vibration velocity and nitration level at the measuring sites of lower altitude showed higher than that of higher altitude.

Reproducibility of Regional Pulse Wave Velocity in Healthy Subjects

  • Im Jae-Joong;Lee, Nak-Bum;Rhee Moo-Yong;Na Sang-Hun;Kim, Young-Kwon;Lee, Myoung-Mook;Cockcroft John R.
    • International Journal of Vascular Biomedical Engineering
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    • 제4권2호
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    • pp.19-24
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    • 2006
  • Background: Pulse wave velocity (PWV), which is inversely related to the distensibility of an arterial wall, offers a simple and potentially useful approach for an evaluation of cardiovascular diseases. In spite of the clinical importance and widespread use of PWV, there exist no standard either for pulse sensors or for system requirements for accurate pulse wave measurement. Objective of this study was to assess the reproducibility of PWV values using a newly developed PWV measurement system in healthy subjects prior to a large-scale clinical study. Methods: System used for the study was the PP-1000 (Hanbyul Meditech Co., Korea), which provides regional PWV values based on the measurements of electrocardiography (ECG), phonocardiography (PCG), and pulse waves from four different sites of arteries (carotid, femoral, radial, and dorsalis pedis) simultaneously. Seventeen healthy male subjects with a mean age of 33 years (ranges 22 to 52 years) without any cardiovascular disease were participated for the experiment. Two observers (observer A and B) performed two consecutive measurements from the same subject in a random order. For an evaluation of system reproducibility, two analyses (within-observer and between-observer) were performed, and expressed in terms of mean difference ${\pm}2SD$, as described by Bland and Altman plots. Results: Mean and SD of PWVs for aorta, arm, and leg were $7.07{\pm}1.48m/sec,\;8.43{\pm}1.14m/sec,\;and\;8.09{\pm}0.98m/sec$ measured from observer A and $6.76{\pm}1.00m/sec,\;7.97{\pm}0.80m/sec,\;and\;\7.97{\pm}0.72m/sec$ from observer B, respectively. Between-observer differences ($mean{\pm}2SD$) for aorta, arm, and leg were $0.14{\pm\}0.62m/sec,\;0.18{\pm\}0.84m/sec,\;and\;0.07{\pm}0.86m/sec$, and the correlation coefficients were high especially 0.93 for aortic PWV. Within-observer differences ($mean{\pm}2SD$) for aorta, arm, and leg were $0.01{\pm}0.26m/sec,\;0.02{\pm}0.26m/sec,\;and\;0.08{\pm}0.32m/sec$ from observer A and $0.01{\pm}0.24m/sec,\;0.04{\pm}0.28m/sec,\;and\;0.01{\pm}0.20m/sec$ from observer B, respectively. All the measurements showed significantly high correlation coefficients ranges from 0.94 to 0.99. Conclusion: PWV measurement system used for the study offers comfortable and simple operation and provides accurate analysis results with high reproducibility. Since the reproducibility of the measurement is critical for the diagnosis in clinical use, it is necessary to provide an accurate algorithm for the detection of additional features such as flow wave, reflection wave, and dicrotic notch from a pulse waveform. This study will be extended for the comparison of PWV values from patients with various vascular risks for clinical application. Data acquired from the study could be used for the determination of the appropriate sample size for further studies relating various types of arteriosclerosis-related vascular disease.

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Sterilization of Bacteria, Yeast, and Bacterial Endospores by Atmospheric-Pressure Cold Plasma using Helium and Oxygen

  • Lee Kye-Nam;Paek Kwang-Hyun;Ju Won-Tae;Lee Yeon-Hee
    • Journal of Microbiology
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    • 제44권3호
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    • pp.269-275
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    • 2006
  • Atmospheric-pressure cold plasma (APCP) using helium/oxygen was developed and tested as a suitable sterilization method in a clinical environment. The sterilizing effect of this method is not due to UV light, which is known to be the major sterilization factor of APCP, but instead results from the action of reactive oxygen radicals. Escherichia coli, Staphylococcus aureus, and Saccharomyces cerevisiae deposited on a nitrocellulose filter membrane or Bacillus subtilis spores deposited on polypropylene plates were exposed to helium/oxygen plasma generated with AC input power at 10 kHz, 6 kV. After Plasma treatment, nitrocellulose filter membranes were overlaid on fresh solid media and CFUs were counted after incubation overnight. D-values were 18 sec for E. coli, 19 sec for S. aureus, 1 min 55 sec for S. cerevisiae, and 14 min for B. subtilis spores. D-values of bacteria and yeast were dependent on the initial inoculation concentration, while the D-value of B. subtilis spores showed no correlation. When treated cells were observed with a scanning electron microscope, E. coli was more heavily damaged than S. aureus, S. cevevisiae exhibited peeling, and B. subtilis spores exhibited shrunken morphology. Results showed that APCP using helium/oxygen has many advantages as a sterilization method, especially in a clinical environment with conditions such as stable temperature, unlimited sample size, and no harmful gas production.