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Supratentorial Leptomeningeal Hemangioblstoma : Case Report
Jang, Han Won,Byun, Woo Mok,Lee, Jae Kyo,Cho, Jae Ho,Cho, Kil ho,Hwang, Mi Soo,Park, Bok Hwan,Choi, Joon Hyuk 영남대학교 의과대학 2007 Yeungnam University Journal of Medicine Vol.24 No.2S
혈관아세포종은 소뇌에 가장 흔하게 발생하며 von Hippel-Lindau disease와 연관될 수 있다. 저자들은 천막상부 연수막에서 기원한 혈관아세포종의 자기공명영상과 병리학적 소견에 대해서 기술하고자 한다. Hemangioblastoma is a benign tumor that most commonly occurs in the cerebellum and associated with von Hippel-Lindau (VHL) disease. Supratentorial hemanigoblastomas are exceptionally rare. We describe the magnetic resonance imaging (MRI) and histopathologic findings of a supratentorial leptomeningeal hemangioblastoma.
Performance Analysis of DS/CDMA DPSK System with PLL Gain
Jang, Moon-Kee,Kim, Joon-Bae,Kim, Won-Sub,Ju, Jong-Hyuk,Park, Jin-Soo 청주대학교 산업과학연구소 2003 産業科學硏究 Vol.20 No.2
이동통신채널에서 수신된 신호는 다중경로 페이딩에 의해 진폭과 위상에 영향을 받게 된다 따라서 본 논문에서는 송수신기 사이에서 발생된 위상차를 Tikhonov 확률밀도함수로 모델링하고 PLL 이득에 따른 DS/CDMA/ DPSK 시스템의 성능을 분석하였다. 그 결과, 본 논문에서 제안된 시스템에 PLL의 이득을 조정함으로써 위상이 완전 동기된 DPSK 시스템의 성능에 근접하게 됨을 알 수 있었다 컴퓨터 모의실험결과, 제안된 시스템에서 PLL 이득이 1dB인 경우 두 시스템간의 성능차는 4.8dB, PLL이득이 7dB인 경우 0.4dB로 근접하는 것을 알 수 있었으며 PLL 이득을 30dB 이상인 경우 제안된 시스템이 완전동기된 DPSK 시스템과 같은 성능을 나타냄을 알 수 있었다 A received signal in mobile communication environments exhibits variation in both amplitude and phase due to the multipath fading Therefore we analyzed the performance of DS/CDMA (Direct Sequence / Code Division Multiple Access) DPSK(Difference Phase Shift Keying) system for the variations of PLL(Phase Locked Loop) gain with Tikhonov probability density function, assuming that the phase difference between transmitter and receiver signals is phase error As a result, it is discovered that the performance of system could be improved by the control of PLL gain in compared w t h the DPSK system which does not consider the phase error If the PLL gain is 1dB, the difference of two systems is 48dB and 04dB at 7dB And if 30dB, it coincides From above, it also verified that the limit of gain is 30dB
Jang, Hye-Ock,Kim, Dong-Won,Kim, Byeong-Ill,Sim, Hong-Gu,Lee, Young-Ho,Lee, Jong-Hwa,Bae, Jung-Ha,Bae, Moon-Kyoung,Kwon, Tae-Hyuk,Yun, Il The Korean Society of Pharmacology 2004 The Korean Journal of Physiology & Pharmacology Vol.8 No.2
The purpose of this study was to provide a basis for studying the molecular mechanism of pharmacological action of chlorhexidine digluconate. Large unilamellar vesicles (OPGTL) were prepared with total lipids extracted from cultured Porphyromonas gingivalis outer membranes (OPG). The anthroyloxy probes were located at a graded series of depths inside a membrane, depending on its substitution position (n) in the aliphatic chain. Fluorescence polarization of n-(9-anthroyloxy)stearic acid was used to examine effects of chlorhexidine digluconate on differential rotational mobility, while changing the probes' substitution position (n) in the membrane phospholipids aliphatic chain. Magnitude of the rotational mobility of the intact six membrane components differed depending on the substitution position in the descending order of 16-(9-anthroyloxy)palmitic acid (16-AP), 12, 9, 6, 3 and 2-(9-anthroyloxy)stearic acid (12-AS, 9-AS, 6-AS, 3-AS and 2-AS). Chlorhexidine digluconate increased in a dose-dependent manner the rate of rotational mobility of hydrocarbon interior of the OPGTL prepared with total lipids extracted from cultured OPG, but decreased the mobility of membrane interface of the OPGTL. Disordering or ordering effects of chlorhexidine digluconate on membrane lipids may be responsible for some, but not all of its bacteriostatic and bactericidal actions.
Missing Cases in Diagnosis of HCC 2 cm or More Sizes
( Hyuk Jin Moon ),( Sae Hwan Lee ),( Hong Soo Kim ),( Sang Gyune Kim ),( Young Seok Kim ),( Boo Sung Kim ),( Soung Won Jeong ),( Jae Young Jang ) 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: The aim of this study was to analysis the cause of missing cases in diagnosis HCC 2cm or more sizes in Soonchunhyang University College of Medicine Cheonan Hospital about 10 years. Methods: Between March 2006 and February 2014, 111 patients conducted HCC surveillance over 1 year among 726 patients diagnosed HCC by CT or MRI. We analysis retrospectively ultrasonographic finding of missing cases in diagnosis HCC 2cm or more sizes. We define “missing case” in the case of ultrasound performed two or more times within 1 year and diagnosis HCC 2cm or more sizes by CT or MRI after ultrasound. Results: The total missing rate was 23.4% (26/111) in HCC surveillance, respectively. Missing case was 4 patients in chronic hepatitis B group (12 cases) and 22 patients in liver cirrhosis group (92 cases) (33.3% vs. 23.9%, p=0.593). Missing case was 12 patients in surveillance by one operator group (71 cases) and 14 patients in surveillance by multi operator group (40 cases) (16.9% vs. 35%, p=0.094). The total missing rate was 36% (40/111) based on more than 1cm, 23% (26/111) based on more than 2cm, 10% (11/111) based on more than 3cm. Missing rate was 33.8% (24/71) based on more than 1cm, 16% (12/71) based on more than 2cm, 4.2% (3/71) based on more than 3cm in surveillance by one operator group. Missing rate was 40% (16/40) based on more than 1cm, 35% (14/40) based on more than 2cm, 20% (8/40) based on more than 3cm in surveillance by multi operator group. Conclusions: Ultrasonography is important test method to diagnosis and surveillance for HCC. But it affected by the ability of the operator, characteristics of HCC, size, location. To diagnosis small sized HCC, missing rate was lower in surveillance by one operator which know patient’s clinical findings and examination results. In surveillance by one operator, missing cases were “blind spot” (dome, S7,8), isoechoic lesion, diffuse and infiltrative lesion. But all cases were confirmed by repeated ultrasonography after diagnosis by CT or MRI.
( Won Gu Kim ),( Tae Yong Kim ),( Tae Hyuk Kim ),( Hye Won Jang ),( Young Suk Jo ),( Young Joo Park ),( Sun Wook Kim ),( Won Bae Kim ),( Min Ho Shong ),( Do Joon Park ),( Jae Hoon Chung ),( Young Kee 대한내과학회 2014 The Korean Journal of Internal Medicine Vol.29 No.3
Background/Aims: Follicular thyroid carcinoma (FTC) and Hurthle cell carcinoma(HCC) of the thyroid are relatively uncommon thyroid malignancies in iodine-sufficient areas. In this study we evaluated the clinical behavior, prognosticfactors and treatment outcomes of FTC and HCC in Korea. Methods: This multicenter study included 483 patients with FTC and 80 patientswith HCC who underwent an initial surgery between 1995 and 2006 in one of thefour tertiary referral hospitals in Korea. We evaluated clinicopathological factorsassociated with distant metastases and recurrence during a median of 6 years offollow-up. Results: HCC patients were significantly older (49 years vs. 43 years; p < 0.001) andhad more lymphovascular invasions (22% vs. 14%; p = 0.03) compared with FTCpatients. Distant metastases were confirmed in 40 patients (8%) in the FTC groupand in two patients (3%) in the HCC group (p = 0.07). Distant metastases weresignificantly associated with older age, widely invasive cancer and extrathyroidalinvasion. Only 14 patients (3%) had recurrent disease and there was no significantdifference between FTC and HCC groups (p = 0.38). Recurrence was associatedwith larger tumor size and cervical lymph node metastasis. Conclusions: HCC patients were older and had more lymphovascular invasionsthan FTC patients. However, FTC and HCC patients had similar initial clinicopathologicalfeatures. Older age, wide invasiveness and extrathyroidal invasionwere independent risk factors for predicting distant metastases in FTC and HCCpatients.