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Percutaneous Sacroplasty : Effectiveness and Long-Term Outcome Predictors
Lee, Jaehyung,Lee, Eugene,Lee, Joon Woo,Kang, Yusuhn,Ahn, Joong Mo,Kang, Heung Sik The Korean Neurosurgical Society 2020 Journal of Korean neurosurgical society Vol.63 No.6
Objective : To evaluate the effectiveness and long-term outcome predictors of percutaneous sacroplasty (PSP). Methods : This single-center study assessed 40 patients with sacral insufficiency fractures using the short-axis technique under C-arm flat-panel detector computed tomography (CT). Two radiologists reviewed the patients' magnetic resonance and CT images to obtain imaging findings before PSP and determine technical success, respectively. The short-term outcomes were visual analog scale score changes and opioid usage reductions. Long-term outcomes were determined using telephone interviews and the North American Spine Society (NASS) patient-satisfaction index at least one year after PSP. Results : Technical success was achieved without any significant complications in 39 patients (97.5%). Telephone interviews were possible with 12 patients and failed in 10 patients; death was confirmed in 18 patients. Fifteen patients (50%) re-visited the hospital and received conservative treatment, including spinal injections. Nine patients reported positive satisfaction (NASS patient-satisfaction index 1 or 2), while the negative satisfaction group (NASS patient-satisfaction index 3 or 4, n=3) showed a higher incidence of compression fractures at the thoracolumbar spine level (66.7% vs. 22.2%) and previous spinal injection history (66.7% vs. 33.3%). The poor response group also showed higher incidences of facet joint arthrosis (100% vs. 55.6%), central canal stenosis (100% vs. 22.2%), neural foraminal stenosis (33.3% vs. 22.2%), scoliosis (100% vs. 33.3%), and sagittal malalignment (100% vs. 44.4%). Conclusion : PSP was effective for sacral insufficiency fractures and showed good long-term outcomes. Combined compression fractures in the thoracolumbar spine and degenerative lumbar pathologies could be possible poor outcome predictors.
이재형(Jaehyung Lee),이하림(Harim Lee),이성주(Sungju Lee),김영민(Youngmin Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
본 논문에서는 7 V 배터리 전원으로 동작하는 대기압 플라즈마 발생 소자의 제작과 특성을 보고하고 있다. 글로우 방전(glow discharge)을 mesh 형태의 전극으로 발생시켜 대기압 플라즈마를 안정적으로 유발할 수 있었으며, 대기압 플라즈마 발생 중 빈번히 나타나는 sputtering 에 의한 전극 손상을 유전체 방전 (dielectric barrier discharge)을 통해 최소화 할 수 있었다. 또한 대기압 플라즈마의 전기적 특성 결과를 측정하여 제시하고 있다.
Sensitive and Selective Detection of HIV-1 RRE RNA Using Vertical Silicon Nanowire Electrode Array
Lee, Jaehyung,Hong, Min-Ho,Han, Sanghun,Na, Jukwan,Kim, Ilsoo,Kwon, Yong-Joon,Lim, Yong-beom,Choi, Heon-Jin Springer US 2016 NANOSCALE RESEARCH LETTERS Vol.11 No.1
<P>In this study, HIV-1 Rev response element (RRE) RNA was detected via an Au-coated vertical silicon nanowire electrode array (VSNEA). The VSNEA was fabricated by combining bottom-up and top-down approaches and then immobilized by artificial peptides for the recognition of HIV-1 RRE. Differential pulse voltammetry (DPV) analysis was used to measure the electrochemical response of the peptide-immobilized VSNEA to the concentration and types of HIV-1 RRE RNA. DPV peaks showed linearity to the concentration of RNA with a detection limit down to 1.513 fM. It also showed the clear different peaks to the mutated HIV-1 RRE RNA. The high sensitivity and selectivity of VSNEA for the detection of HIV-1 RRE RNA may be attributed to the high surface-to-volume ratio and total overlap diffusion mode of ions of the one-dimensional nanowire electrodes.</P>
Robust Fundamental Frequency Estimation Combining Contrast Enhancement and Feature Unbiasing
Jaehyung Lee,Soo-Young Lee IEEE 2008 IEEE signal processing letters Vol.15 No.1
<P>A high-performance fundamental frequency estimator inspired by the human auditory system is presented. It uses a cubic-root transform and contrast enhancement on the spectral domain to enhance weak harmonics and suppress noise. The proposed weighted unbiasing process reduces multiple or submultiple pitch errors efficiently. Evaluation is performed under the presence of white noise, babble noise, and telephone channel distortion. The results show that the proposed method performs equivalent to or better than previous state-of-the-art methods in the majority of the noise and channel conditions.</P>