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Signed-DLMS 적응 알고리즘 이용한 무선 중계 간섭 제거기
유태훈(Tae-Hoon Yoo),우대호(Dae-Ho Woo),김주완(Dae-Ho Woo),하성희(Sung-Hee Ha),반지훈(Ji-Hun Van),이종현(Jong-Hyun Lee) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
In this paper, we study the signed- DLMS adaptive algorithm of wireless repeater for solving shadow region due to propagation between base station and mobile station. The the signed-DLMS algorithm reduces interference signals from multipath and solves the oscillation problem of repeater by estimation and cancellation. To efficiently reject interference signal. the signed-DLMS adaptive algorithm is applied. The computational complexities of the signed-DLMS are reduced verse standard LMS algorithm. Wireless ICS repeater based on signed-DLMS reduces the cost and is able to increase channel capacities.
Prediction of parathyroid hormone signalling potency using SVMs
Yoo, Ahrim,Ko, Sunggeon,Lim, Sung-Kil,Lee, Weontae,Yang, Dae Ryook Springer-Verlag 2009 Molecules and cells Vol.27 No.5
<P>Parathyroid hormone is the most important endocrine regulator of calcium concentration. Its N-terminal fragment (1-34) has sufficient activity for biological function. Recently, site-directed mutagenesis studies demonstrated that substitutions at several positions within shorter analogues (1-14) can enhance the bioactivity to greater than that of PTH (1-34). However, designing the optimal sequence combination is not simple due to complex combinatorial problems. In this study, support vector machines were introduced to predict the biological activity of modified PTH (1-14) analogues using mono-substituted experimental data and to analyze the key physicochemical properties at each position that correlated with bioactivity. This systematic approach can reduce the time and effort needed to obtain desirable molecules by bench experiments and provide useful information in the design of simpler activating molecules.</P>
Biportal Endoscopic Spinal Surgery for Recurrent Lumbar Disc Herniations
Dae-Jung Choi,Je-Tea Jung,Sang-Jin Lee,Young-Sang Kim,Han-Jin Jang,Bang Yoo 대한정형외과학회 2016 Clinics in Orthopedic Surgery Vol.8 No.3
The major problems of revision surgery for recurrent lumbar disc herniation (LDH) include limited visualization due to adhesion of scar tissue, restricted handling of neural structures in insufficient visual field, and consequent higher risk of a dura tear and nerve root injury. Therefore, clear differentiation of neural structures from scar tissue and adhesiolysis performed while preserving stability of the remnant facet joint would lower the risk of complications and unnecessary fusion surgery. Biportal endoscopic spine surgery has several merits including sufficient magnification with panoramic view under very high illumination and free handling of instruments normally impossible in open spine surgery. It is supposed to be a highly recommendable alternative technique that is safer and less destructive than the other surgical options for recurrent LDH.
Yoo, Dae Young,Kim, Woosuk,Nam, Sung Min,Chung, Jin Young,Choi, Jung Hoon,Yoon, Yeo Sung,Won, Moo-Ho,Hwang, In Koo Kluwer Academic/Plenum Publishers 2012 Neurochem Res Vol.37 No.5
<P>In a previous study, we reported that the administration of pyridoxine (vitamin B(6)) to mice for 3 weeks significantly increased cell proliferation and neuroblast differentiation in the dentate gyrus without any neuronal damage. In the present study, we investigated the restorative potentials of pyridoxine on ischemic damage in the hippocampal CA1 region of Mongolian gerbils. Gerbils were subjected to 5 min of transient ischemia, and surgical operation success was assessed by ophthalmoscope during occlusion of common carotid arteries and spontaneous motor activity at 1 day after ischemia/reperfusion. Pyridoxine (350 mg/kg) or its vehicle (physiological saline) was intraperineally administered to ischemic gerbils twice a day starting 4 days after ischemia/reperfusion for 30 or 60 days. The repeated administration of pyridoxine for 30 and 60 days significantly increased doublecortin-immunoreactive neuroblasts in the dentate gyrus and increased NeuN-immunoreactive mature neurons and 관III-tubulin-immunoreactive dendrites in the hippocampal CA1 region. Furthermore, brain-derived neurotrophic factor (BDNF) protein levels were significantly increased in pyridoxine-treated groups compared to those in the vehicle-treated groups. These results suggest that chronic administration of pyridoxine enhances neuroblast differentiation in the dentate gyrus and induces new mature neurons in the hippocampal CA1 region by up-regulating BDNF expression in hippocampal homogenates.</P>
Yoo, Dae Kyoung,Lee, Hea Joeng,Kang, Chang Yong,Kim, Kwang Ho,Kim, Yung Hee,Sung, Jang Hyun Trans Tech Publications, Ltd. 2006 Diffusion and defect data. SSP. [Pt. B], Solid sta Vol.118 No.-
<P>Generally, solution nitriding (nitrogen permeation) is not applied to ferritic stainless steel, which has low nitrogen solubility in the ferrite phase. This study has investigated phase changes, nitride precipitations and hardness variations of Fe-11Cr-0.1Ti (409L) ferritic stainless steel following nitrogen permeation and tempering heat treatments. The strong affinity between nitrogen and Ti enabled the permeation of nitrogen to 409L ferritic stainless steel. The nitrogen-permeated surface changed to a martensitic phase with a hardness range of between 520 and 585Hv, depending on the nitrogen permeation temperature and time, while the surface nitrogen content was about 0.04%~0.05%. When tempering the NPSA (solution annealing after nitrogen permeation) treated specimen at 450 °C, a maximum hardness of 550Hv was obtained, probably due to the precipitation of very fine rod and square type titanium nitrides, while the minimum hardness of 365Hv was obtained at a tempering temperature of 650°C, owing to the precipitation of coarse TiN.</P>
Yoo, Kyung-Tae,Yoon, Jung-Gyu,Park, Bo-Kyung,Han, Hae-Rin,Yun, Young-Dae,Lee, Sang-Bin International Academy of Physical Therapy Research 2012 Journal of International Academy of Physical Ther Vol.3 No.1
The purpose of this study is to identify which width of the base of support(BOS) is safer and more effective in lifting by comparing muscle activations and body sways when lifting objects under the width variation of the BOS. A total of fifteen healthy adults participated in this study. For the width variation of the BOS, the participants changed the width between their feet into three different types(10cm, 32cm, 45cm) and lifted a 10kg four times in each type after going up on a force plate. In order to measure body sways according to the width variation of the BOS, a motion analysis system was used. In addition, in order to measure the muscle activations of lower extremities, including the erector spinae, gluteus maximus, rectus femoris, and tibialis anterior, an electromyogram(EMG) analysis was employed. In addition, the Borg's scale was drawn by quantifying the subjective discomfort levels felt from each width of the BOS. In conclusion, no statistically significant differences according to the width variation of the BOS were observed(p=.295, .308)(p>.05). However, a statistically significant difference was exhibited between the Borg's scale, which indicates the discomfort levels from lifting performances, and the width variation of the BOS (p=$.000^*$).
Fast Search of a Similar Patch for Self-Similarity Based Image Super Resolution
YOO, Jun-Sang,CHOI, Ji-Hoon,CHOI, Kang-Sun,LEE, Dae-Yeol,KIM, Hui-Yong,KIM, Jong-Ok 'Institute of Electronics, Information and Communi 2016 IEICE transactions on information and systems Vol.99e.d No.8
<P>In the self-similarity super resolution (SR) approach, similar examples are searched across down-scales in the image pyramid, and the computations of searching similar examples are very heavy. This makes it difficult to work in a real-time way under common software implementation. Therefore, the search process should be further accelerated at an algorithm level. Cauchy-Schwarz inequality has been used previously for fast vector quantization (VQ) encoding. The candidate patches in the search region of SR are analogous to the code-words in the VQ, and Cauchy-Schwarz inequality is exploited to exclude implausible candidate patches early. Consequently, significant acceleration of the similar patch search process is achieved. The proposed method can easily make an optimal trade-off between running speed and visual quality by appropriately configuring the bypass-threshold.</P>