• Title/Summary/Keyword: Suzuki

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Numerical analysis for nearfield measurement error in a three-dimensional intensity probe. (3차원 인텐시티 프로브의 근거리 음장 측정에서의 오차 수치해석)

  • Kim, Suk-Jae;Jee, Suk-Kun;Suzuki, Hideo;Kim, Chun-Duck
    • The Journal of the Acoustical Society of Korea
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    • v.13 no.3
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    • pp.41-50
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    • 1994

  • We studied an inherent error be caused by a measuring acoustic intensity using probe which can measure simultaneously the three-dimensional acoustic intensity. This three-dimensional intensity probe was constructed with four microphones, proposed by Suzuki et al. . In the computer simulation, we analyzed the nearfield measurement error with arbitary direction and each of axis direction on the ideal point source and the plate sound source which have finite size. From the results, in case of point source, we obtained accurate measurement below about 1dB when the distance of measurement was about 2.5 times with the distance among microphones in this probe. And in the case of plate sound source, the nearfield measurement error was decreased as the length of one side became above 0.02m, we obtained accurate measurement below about 1dB when the length of one side is 0.2m. The nearfield measurement error of finite size sound is small to ignore. Therefore this probe is useful to measure nearfield intensity.

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Ischemic Complications Occurring in the Contralateral Hemisphere after Surgical Treatment of Adults with Moyamoya Disease

  • Jung, Young-Jin;Ahn, Jae-Sung;Kwon, Do-Hoon;Kwun, Byung-Duk
    • Journal of Korean Neurosurgical Society
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    • v.50 no.6
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    • pp.492-496
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    • 2011

  • Objective : Direct revascularization surgery is regarded as the most effective method of treatment of adults with moyamoya disease. These patients, however, have a higher risk of perioperative ischemic complications than do patients with atherosclerotic stroke, and are at risk for ischemic complications in the hemisphere contralateral to the one operated on. We investigated the incidence and risk factors for ischemic stroke in the contralateral hemisphere after surgical treatment of adults with moyamoya disease. Methods : We retrospectively reviewed the medical records and results of neuroimaging studies on 79 hemispheres of 73 consecutive patients with adult moyamoya disease ($mean{\pm}SD$ age, $37.96{\pm}11.27$ years; range, 18-62 years) who underwent direct bypass surgery over 6 years. Results : Ischemic complications occurred in 4 of 79 (5.1%) contralateral hemispheres, one with Suzuki stage 3 and three with Suzuki stage 4. Three patients showed posterior cerebral artery (PCA) involvement by moyamoya vessels. Advanced stage of moyamoya disease (Suzuki stages 4/5/6; $p$=0.001), PCA involvement ($p$=0.001) and postoperative hypotension (mean arterial blood pressure <80% of preoperative mean arterial blood pressure) on the first ($p$<0.0001) and second ($p$=0.003) days after surgery were significantly correlated with postoperative contralateral ischemic complications. Conclusion : In patients with advanced moyamoya disease and involvement of the PCA, intentional hypotension can result in ischemic stroke in the hemisphere contralateral to the one operated on. Careful control of perioperative blood pressure is crucial for good surgical results.

  • https://doi.org/10.3340/jkns.2011.50.6.492 인용 PDF KSCI

Comparative Study of Morphology on Male Sex Comb Variation of the Drosophila Species (Drosophila 수종의 성즐변이에 관한 형태적 비교 연구)

  • Choi, Yung-Hyun;Kwon, Yong-Won;Yoo, Mi-Ae;Lee, Won-Ho
    • Korean journal of applied entomology
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    • v.33 no.4
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    • pp.216-224
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    • 1994

  • Sex combs which lack in females are characteristic of some members of the subgenus Sophophora When present, they can be van/ from a single blistle to very extensive structures, but the meianogaster subgroup of the subgenus Sophophora have only on the f~rst tarsal segments of the fore legs. D mauritiona among the melanogaster compler of the melar~ogaster subgroup have significantly more sex comb teeth (mean 12.75) than other specie& and the yakubo complex (range of the mean 6.84-758) have less than the melanogaster complex (range of the mean 835-12.75). In sex comb tooth number of interspecd~ch ybrids among the melonogoster complex, there appeared difference u;ith parental species Thus, analysis of male sex comb tooth in FI hybrid could not exhibit the direction of hereditan/ nature. On the other hand, D auraria (the montium subgroup), D suzuki (the suzuki subgroup) and D, lutecens (the takohashii subgroup) of the melanogaster species have two sex combs on the first and second tarsal segments, and the mean number were different according to the species.

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