http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
세라믹 VCO의 Block 특성 분석을 통한 주파수 튜닝
유찬세,이우성,Yoo Chan-Sei,Lee Woo-Sung 한국마이크로전자및패키징학회 2004 마이크로전자 및 패키징학회지 Vol.11 No.2
세라믹 모듈 내부에 내장되는 인덕터와 캐패시터와 같은 수동소자들은 주변 소자 및 패턴의 영향으로 모듈 내부에서는 변형된 특성을 갖게 된다. 이 때문에 수동소자들의 특성을 모듈내부에 내장된 상태로 추출하는 것이 가장 정확하다. 본 연구에서는 세라믹 VCO를 개발함에 있어서 전체 회로를 공진부와 발진부로 나누어서 각 block의 특성을 측정하였고 이를 통해 VCO의 고주파수 거동을 예측하여 개발에 활용할 수 있도록 하였다. Ceramic components and modules using LTCC passives are being performed and on the passives included in modules have been studied nowadays. However the characteristics changes of passives in ceramic module due to the coupling between patterns, so each block in module, must be analyzed in the state of module including coupling factors. In our research, characteristics of each block of VCO, resonator part, oscillator part, output part were measured and analyzed to allow the prediction of behavior of VCO.
본태성 수전증과 파킨슨병 환자에서 미토콘드리아 DNA 비교 분석
김래상,유찬종,이상구,김우경,한기수,김영보,박철완,이언,Kim, Rae Sang,Yoo, Chan Jong,Lee, Sang-Gu,Kim, Woo-Kyung,Han, Ki-Soo,Kim, Young-Bo,Park, Cheol-Wan,Lee, Uhn 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.11
Essential tremor(ET) is the most common movement disorder however there has been little agreement in the neurologic literature regarding diagnostic criteria for ET. Familial ET is an autosomal dominant disorder presenting as an isolated postural tremor. The main feature of ET is postural tremor of the arms with later involvement of the head, voice, or legs. In previous studies, it was reported that ET susceptibility was inherited in an autosomal dominant inheritance. As with previous results, it would suggest that ET might be associated with defect of mitochondrial or nuclear DNA. Recent studies are focusing molecular genetic detection of movement disorders, such as essential tremor and restless legs syndrome. Parkinson's disease(PD) is a neurodegenerative disease involving mainly the loss of dopaminergic neurons in substantia nigra by several factors. The cause of dopaminergic cell death is unknown. Recently, it has been suggested that Parkinson's disease many result from mitochondrial dysfunction. The authors have analysed mitochondrial DNA(mtDNA) from the blood cell of PD and ET patients via long and accurate polymerase chain reaction(LA PCR). Blood samples were collected from 9 PD and 9 ET patients. Total DNA was extracted twice with phenol followed by chloroform : isoamylalcohol. For the analysis of mtDNA, LA PCR was performed by mitochondrial specific primers. With LA PCR, 1/3 16s rRNA~1/3 ATPase 6/8 and COI~3/4 ND5 regions were observed in different patterns. But, in the COI~1/3 ATPase 6/8 region, the data of PCR were observed in same pattern. This study supports the data that ET and PD are genentic disorders with deficiency of mitochondrial DNA multicomplexes.
골다공증을 동반한 척추체 압박골절에 대한 경피적 척추 성형술 - 예비보고 -
이상구,유찬종,Lee, Sang-Gu,Yoo, Chan-Jong 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.5
Objective : Percutaneous vertebroplasty is an effective and minimally invasive procedure consisting of the injection of a PMMA(polymethyl methacrylate) into the vertebral body compression fracture with osteoporosis. Matherials and Methods : Twenty-eight procedures were performed for vertebral body compression fractures with osteoporosis in 25 patients(22 women, 3 men). The mean age was 65.9 years old. The inclusion criteria for percutaneous vertebroplasty were 1) acute vertebral body compression fracture with osteoporosis, 2) expected high operative morbidity in old age, 3) no neurologic deficits, 4) no or minimal canal enchroachment, 5) patient refusal of invasive surgery. All patients underwent MR images before the procedure. Under local anesthesia, after the percutaneous needle puncture of the involved vertebra via a transpedicular approach and venography using the water soluble contrast material, PMMA injection was introduced into the fractured vertebral body. Results : The procedure was technically successful in all patients. All patients experienced excellent pain relief (complete pain relief ; 10, marked pain relief ; 14). One patient experienced marked pain relief, however, the patient died during the follow-up period due to stomach cancer. There were twelve paravertebral tissue leaks, twelve paravertebral venous plexus leaks, four epidural leaks and one intradiskal leak, but no clinically significant complications occurred in all patients. Conclusion : Percutaneous vertebraoplasty is a valuable procedure in the treatment of vertebral body compression fracture with osteoporosis, providing immediate pain relief and early mobilization. MRI is the most reliable diagnostic tool for identifying painful fractured vertebral body.
PCB내 1005 수동소자 내장을 이용한 Diplexer 구현 및 특성 평가
박세훈,윤제현,유찬세,김필상,강남기,박종철,이우성,Park, Se-Hoon,Youn, Je-Hyun,Yoo, Chan-Sei,Kim, Pil-Sang,Kang, Nam-Kee,Park, Jong-Chul,Lee, Woo-Sung 한국마이크로전자및패키징학회 2007 마이크로전자 및 패키징학회지 Vol.14 No.2
현재 PCB기판내에 소재나 칩부품을 이용하여 커패시터나 저항을 구현하여 내장시키는 임베디드 패시브기술에 대한 연구가 많이 진행되어 지고 있다. 본 연구에서는 커패시터 용량이나 인덕터의 특성이 검증된 칩부품을 기판내 내장시켜 다이플렉서 기판을 제작하였다. $880\;MHz{\sim}960\;MHz(GSM)$영역과 $1.71\;GHz{\sim}1.88\;GHz(DCS)$영역을 나누는 회로를 구성하기 위해 1005크기의 6개 칩을 표면실장 공정과 함몰공정으로 형성시켜 Network Analyzer로 측정하여 비교하였다. chip표면실장으로 구현된 Diplexer는 GSM에서 최대 0.86 dB의 loss, DCS에서 최대 0.68 dB의 loss가 나타났다. 표면실장과 비교하였을 때 함몰공정의 Diplexer는 GSM 대역에서 약 5 dB의 추가 loss가 나타났으며 목표대역에서 0.6 GHz정도 내려갔다. 칩 전극과 기판의 도금 연결부위는 $260^{\circ}C$, 80분의 고온공정 및 $280^{\circ}C$, 10초의 솔더딥핑의 열충격 고온공정에서도 이상이 없었으며 특성의 변화도 거의 관찰되지 않았다. Today lots of investigations on Embedded Passive Technology using materials and chip components have been carried out. We fabricated diplexers with 1005 sized-passives, which were made by burying chips in PCB substrate and surface mounting chip on PCB. 6 passive chips (inductors and capacitors) were used for the frequency divisions of $880\;MHz{\sim}960\;MHz(GSM)$ and $1.71\;GHz{\sim}1.88\;GHz(DCS)$. Two types of diplxer were characterized with Network analyzer. The chip buried diplexer showed extra 5db loss and a little deviation of 0.6GHz at aimed frequency areas, whereas the chip mounted diplexer showed man. 0.86dB loss within GSM field and max. 0.68dB within DCS field respectively. But few degradations were observed after $260^{\circ}C$ for 80min baking and $280^{\circ}C$ for 10sec solder floating.
척추 결핵의 전방유합술시 Titanium Mesh Cage의 효과
정주호,이상구,유찬종,한기수,김우경,김영보,박철완,이언,Jeong, Ju-Ho,Lee, Sang-Gu,Yoo, Chan-Jong,Han, Ki-Soo,Kim, Woo-Kyung,Kim, Young-Bo,Park, Cheol-Wan,Lee, Uhn 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.8
Objective : The maintenance of the correction of kyphotic deformity is one of the difficult problem in tuberculous spondylitis after anterior debriment and fusion with tricortical bone graft. The goal of this study is to find out the efficacy of titanium mesh cage impacted with autogenous bone chip in tuberculous spondylitis treated with anterior intervertebral fusion. Materials and Method : Twelve patients were treated with anterior intervertebral fusion using titanium mesh cage for tuberculous spondylitis from January 1996 to June 1999. We analized the changes in the correction of kyphotic deformity, changes of ESR and CRP, fusion state and recurrence after anterior intervertebral fusion with titanium mesh cage. Results : Clinical symptoms were improved in all twelve patients without any neurologic complications. The mean kyphotic angle corrected was 7.3 degrees immediately after operation, but the loss of correction of kyphotic angle was 2.2 degrees after 3 months and 2.6 degrees after 6 months. We found that the loss of correction of kyphotic deformity occurred mainly within the first 3 months after surgery. Only one patient, suffered from acute hepatic failure after first operation and had an insufficient anti-tuberculous medication therapy, showed recurrence of tuberculous spondylitis after 6 months. The patient underwent a second operation with posterior fixation procedure with good outcome. The changes of ESR and CRP were not specifically important factor to reveal recurrence of tuberculosis of the spine in our series. Conclusion : The surgical procedure of tuberculous spondylitis using titanium mesh cage with bone chip seems to be an effective procedure to minimize loss of the correction of kyphotic deformity without any aggravating inflammatory change and recurrence with titanium mesh cage, when sufficient debridement and anti-tuberculous chemotherapy are achieved.
정주호,이상구,유찬종,한기수,김우경,김영보,박철완,이언,Jeong, Ju-Ho,Lee, Sang-Gu,Yoo, Chan-Jong,Han, Ki-Soo,Kim, Woo-Kyung,Kim, Young-Bo,Park, Cheol-Wan,Lee, Uhn 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.10
The intradural lumbar disc herniation which was first described by Dandy in 1942 is unusual. The pathogenesis is obscure and preoperative diagnosis is not easy. The patient usually have more severe neurologic deficits than those found in the much more common extradural disc herniations. We experienced two cases of the intradural lumbar disc herniation who had previous disc operations and the symptoms and neurologic signs were improved after removal of the intradural sequestration of disc fragments.