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양태호,이영신,김태형,김윤재,설창원,양명석,안채헌,이규섭 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11
본 연구에서는 폴리우레탄 S70A, S80A, S95A 을 이용한 충격 프로그래머를 이용하여 소규모 축소 충돌 실험을 수행하였다. 충돌 실험을 통해, 충돌 속도에 따른 시험대의 가속도 이력 선도를 획득하였다. 충돌 속도에 따른 초탄성 충격 프로그래머의 압축 특성을 수치해석으로 구현하기 위해서 다양한 재료 모델이 연구되어 왔으며, 수치해석 모델 중 본 논문에서는 Ogden 재료 모델을 이용하였다. 유한요소 해석에 사용된 Ogden 초탄성 재료 모델의 타당성을 검토하기 위해서 실험을 통한 시험대의 가속도 이력 선도와 비교 및 검토하였다. In this paper, using the hyper-elastic shock programmer with polyurethane S70A, S80A and S95A , the small impact test was performed. By the impact test, the time history on the acceleration transmitted to test bed was obtained. To simulate the compression characteristic of the hyper-elastic materials under various impact velocities, numerical material models was studied. Ogden hyper-elastic material model was used in this paper. To validate the Ogden hyper-elastic material model used in simulation, the comparison with results between the simulation and impact test was performed.
양태호 대한평형의학회 2012 Research in Vestibular Science Vol.11 No.-
Vestibular stimulation by air-conducted sound (ACS) or by bone-conducted vibration
양태호,오선영,김태우,신병수,이준영,정슬기,서만욱 대한평형의학회 2012 Research in Vestibular Science Vol.11 No.3
Background and Objectives: To provide the empirical basis for using ocular vestibular evoked myogenic potentials (oVEMPs) in response to bone-conducted vibration (BCV) stimulation to indicate vestibular function in normal subjects. Materials and Methods: In response to bone-conducted tone burst (90 dB nHL and 100 dB nHL with frequencies 500 Hz and 1,000 Hz, the oVEMPs were measured in 45 healthy controls. The early negative component (n10) of the oVEMP to brief BCV of the forehead and at each mastoid process is recorded by surface electromyography electrodes just beneath the eyes. We used a hand-held vibrator (Bruel and Kjaer 4810 Mini-Shaker) placed on the forehead, in the midline at the hairline (Fz) and at each mastoid process and quantified the individual differences in n10 magnitude, latency and symmetry to Fz and mastoid BCV at each frequency. Results: In normal subjects, n10 responses were symmetrical in the two eyes during Fz and both mastoid stimuli and the latencies of the onset were consistent among subjects. Response rate is similar between Fz and mastoid stimuli. However, at each stimulation site, response rate is higher on 500 Hz than on 1,000 Hz stimulation. During the mastoid stimuli,the onset latency is slightly shorter and amplitude is larger than the Fz stimuli. The average amplitudes decreased with age and average latency (to peak)increased slightly with increasing age. Conclusion: Clear oVEMP responses to bone-conducted Fz and mastoid stimuli were evoked from normal subjects. It is concluded that bone-conducted stimuli as well as air conduction can evoke myogenic potentials from the ocular muscles.
급성 소뇌경색 환자에서 원활추종안구운동의 개시: 예비연구
양태호,오선영 대한평형의학회 2013 Research in Vestibular Science Vol.12 No.2
The cerebellar lesion causes an initiation deficit of smooth-pursuit eye movement depending on the location of the lesion. We investigated the initiation of smooth pursuit in patients with cerebellar infarction and in healthy subjects, using step-ramp stimuli. Materials and Methods: Ten patients with cerebellar infarction documented by brain magnetic resonance imaging and fifty healthy subjects are recruited. To estimate the initiation of smooth pursuit, the onset latency and initial acceleration during the first 100ms of the horizontal smooth pursuit were estimated using the step-ramp target stimuli (5°/sec, 10°/sec, and 20°/sec). Results: In healthy subjects, onset latency of pursuit was shortened and initial acceleration was increased as target velocity was increasing. In patients with unilateral cerebellar infarction, the onset latency of ipsilesional smooth pursuit was significantly delayed at the target velocities of 10°/sec and 20°/sec. For the fast target velocity of 20°/sec, there was significant decrease of the initial acceleration of contralesional pursuit. Conclusion: In comparison with the healthy subjects, the patients with unilateral cerebellar lesions showed significant delay of pursuit onset and decrease of initial eye acceleration in the fast target velocity. These results support that the cerebellar lesions affect not only steady-state smooth pursuit gain but also the processing time required to initiate smooth pursuit, i.e., onset latency and initial acceleration. More extensive study is needed to confirm the role of cerebellum for parametric adjustment of each component of smooth pursuit.
양태호,정석영,오선영,신병수,서만욱,김영현,정슬기 대한신경과학회 2008 Journal of Clinical Neurology Vol.4 No.1
We report a case of recurrent Streptococcus pneumoniae meningoencephalitis with a transethmoidal meningoencephalocele (TEME) but without cerebrospinal fluid (CSF) leakage. A 35-year-old man was admitted with S. pneumoniae meningitis. He had suffered from four episodes of recurrent pneumococcal meningitis during the previous 4 years. A computed tomography scan of the paranasal sinus showed the TEME protruding through a bony defect of the right frontal base. However, the patient did not have symptoms that could be attributable to CSF leakage, and radioisotope cisternography did not identify a leak. Brain magnetic resonance imaging revealed cortical lesions overlying the TEME, and electroencephalography revealed epileptiform discharges in frontal regions. Appropriate antibiotics therapy without steroids was given to improve his condition. The presented case suggests that even in the absence of clinically demonstrable CSF leakage, an occult skullbase defect and its associated meningoencephalocele should be considered in patients with recurrent bacterial meningitis.
양태호,김연수,윤태영 대한피부과학회 2001 大韓皮膚科學會誌 Vol.39 No.9
The eyebrows consist of thickened arches of skin, which bear numerous shop, thick hairs directed obliquely to the surface. Alopecia seats is a nonscarring hair loss condition. which is considered to be a autoimmune disease. The patchy loss of hairs occurring in alopecia areata may not only involve the scalp, but also the eyebrows, making it a disfiguring disease. This condition almost always involves the scalp, so alopecia areata only involving the eyebrows is very rare. We report two cases of alopecia areas limited to the eyebrows without involving any other sites during the disease course in healthy girls.