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이상율 ( Sang Yool Lee ),이종호 ( Jong Ho Lee ) 한국도시지리학회 2004 한국도시지리학회지 Vol.7 No.1
During the last decade venture business firms have drawn a great deal of attention to academic and policy-making communities in that they are believed to be a driving force to sustain the growth of urban and regional economies. Although a number of theoretical and empirical studies on organizational structure, the success factors of venture business and some successful world-class clusters of new economy start-ups have been made, it still lacks research on the factors of influencing the locational choice and shift of venture business firms in city-regions which retain weak foundations of both hard and soft infrastructure. In this paper we thus attempt to examine factors on which venture business firms in Daegu City influence locational choice and shift and to provide policy directions for promoting creative urban cluster of venture business firms in Daegu City.
음차표기된 외래어의 발음특성을 이용한 자동 영어단어 복원
이상율(Sang-Yool Lee),강인수(In-Su Kang),나승훈(Seung-Hoon Na),이종혁(Jong-Hyeok Lee) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1B
음차 표기된 외래어의 원어 복원 문제에 있어서 확률모델을 이용한 방법들이 기존에 많이 사용되었다. 이는 ‘발음단위’개념(이재성 1998)을 이용하여 서로 대응될 수 있는 한글발음단위와 영어발음단위의 쌍들을 대역어 집합으로부터 추출하고 이를 확률모델에 적용하는 방법이다. 하지만 영어 철자를 영어 발음단위로 변환하는 과정에서 그 단어의 어원에 따라 서로 다른 발음상의 특징을 보이게 되는데, 이것이 기존의 연구에서 성능을 떨어뜨리는 원인이 되었다. 따라서 본 논문에서는 학습 데이터(대역어 집합)들을 발음 특성에 따라 분류하고, 분류된 각 데이터 집합을 학습과정에서 따로 적용함으로써 서로 다른 특성을 가지는 여러 개의 복원 모델을 얻을 수 있고, 이를 이용하여 원어 복원에 대한 성능을 높일 수 있음을 보여준다.
Jung-Kyu Lee,Hu Young Jeong,In-Tak Cho,Jeong Yong Lee,Sung-Yool Choi,Hyuck-In Kwon,Jong-Ho Lee IEEE 2010 IEEE electron device letters Vol.31 No.6
<P>We investigated the low-frequency noise (LFN) properties of the bipolar switching resistance random access memories (RRAMs) for the first time with amorphous TiO<SUB>x</SUB> -based RRAM devices. The LFNs are proportional to 1/f for both high-resistance (HRS) and low-resistance states (LRS). The normalized noise in HRS is around an order of magnitude higher than that in LRS. The random telegraph noise (RTN) is observed only in HRS, which represents that the dominant trap causing the RTN becomes electrically inactive by being filled with electrons in LRS. The voltage dependence S<SUB>i</SUB>/I<SUP>2</SUP> of shows that the noise can be used to elucidate the operation mechanism of RRAM devices.</P>
Chung, Dai-Jung,Choi, Chi-Bong,Lee, Sung-Ho,Kang, Eun-Hee,Lee, Jae-Hoon,Hwang, Soo-Han,Han, Hoon,Lee, Jong-Hwan,Choe, Bo-Young,Lee, Soo-Yeol,Kim, Hwi-Yool Wiley Subscription Services, Inc., A Wiley Company 2009 Journal of neuroscience research Vol.87 No.16
<P>The present study examined the effects of human umbilical cord blood-derived mesenchymal stem cells (HUCB-derived MSCs) delivered through the basilar artery in a canine thromboembolic brain ischemia model. Cerebral ischemia was induced through occlusion of the middle cerebral artery by injecting thrombus emboli into 10 beagles. In the HUCBC group (n = 5), 1 × 10<SUP>6</SUP> HUCB-derived MSCs were transplanted through the basilar artery 1 day after ischemic induction using an endovascular interventional approach. In the control group (n = 5), phosphate-buffered saline (PBS) was injected in the same manner in as the HUCBC group. Upon neurobehavioral examination, earlier recovery was observed in the HUCBC group. The HUCBC group showed a decrease in the infarction volume at 1 week after cerebral ischemic induction, whereas the control group showed an increase in the infarction volume at 1 week, by magnetic resonance image analysis. Transplanted cells had differentiated into neurons and astrocytes and were observed in and around endothelial cells that were positive for von Willebrand factor (vWF). HUCB-derived MSCs expressed neuroprotective factors, such as brain-derived neurotrophic factor (BDNF) and vascular endothelial growth factor (VEGF), at 4 weeks after the transplantation. The transplanted cells demonstrated their efficacy by reducing the infarction lesion volume and through earlier recovery from the neurological deficit. These results suggest that intraarterial transplantation of HUCB-derived MSCs could be useful in clinical treatment of cerebral ischemia. © 2009 Wiley-Liss, Inc.</P>