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Noise Covariances Estimation for Systems with Bias States
Um, Tae-Yoon,Lee, Jang-Gyu,Park, Seong-Taek,Park, Chan-Gook 서울대학교 항공우주신기술연구소 2000 항공우주신기술연구소 연구보고 Vol.1 No.2
This paper presents a new approach to noise covariances estimation for a linear, time-invariant, stochastic system with constant but unknown bias states. The system is supposed to satisfy controllable/observable conditions without bias states. Based on a restructured data representation, the covariance of a new variable that consists of measurement vectors is expressed as a linear combination of unknown parameters. Noise covariances are then estimated by employing a recursive least-squares algorithm. The proposed method requires no a priori estimates of noise covariances, provides consistent estimates, and can also be applied when the relationship between bias states and other states is unknown. The method has been applied to SDINS initial alignment. Simulation results indicate a satisfactory performance of the proposed method.
Treatment and Prognosis of Advanced HCC with Metastasis
( Tae Hyung Kim ),( Soon Ho Um ),( Han Ah Lee ),( Jung Mi Chang ),( Dae Hoe Gu ),( Jem Ma Ahn ),( Yeon Seok Seo ),( Hyung Joon Yim ),( Yoon Tae Jeen ),( Hong Sik Lee ),( Hoon Jai Chun ),( Chang Duck K 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: As hepatocellular carcinoma (HCC) progresses, it is accompanied by deterioration of liver function, which makes treatment difficult. In particular, advanced HCC involves not only impairment in liver function and general condition but also vascular invasion and other organ metastasis. It is very heterogeneous stage and needs to be further subdivided. In the present study, we investigated treatment outcomes and the factors associated with prognosis in HCC patients with distant metastasis. Methods: We analyzed data of 103 patients with advanced HCC with distant metastasis at initial diagnosis from June 2004 to June 2015. The patients received the first treatment for HCC in our hospital. Results: Mean age of patients was 57.3 ± 11.6 years and men were predominant (80.6%). The median observation period was 3.2 (0.3-39.1) months, and 99 (96.1%) of these patients died. There were no significant association with survival in sex, age, etiology and the number of liver tumors (p = 0.274, 0.094, 0.854 and 0.280, respectively). In univariate analysis, bilobar tumor distribution, invasion of main portal vein or IVC, Child-Pugh class, and treatment modality showed significant association with shorter survival. (p = 0.033, <0.001, 0.015, <0.001, and <0.001, respectively). In multivariate analysis, Child-Pugh class (p<0.001) and initial treatment modality (p=0.001) were significantly independent factors for survival. In Kaplan-Meier curve, systemic chemotherapy-alone or combination of locoregional treatment (LRT) and cytotoxic chemotherapy has no significant difference on survival compared with best supportive care as initial treatment. (median survival time, MST, 2.3 vs. 1.6 months) However, LRT alone (MST) or combination of sorafenib and LRT (MST 4.8, 4.3 months) showed significant survival benefit. (p = 0.001, 0.002). Conclusions: The Child-Pugh score and treatment modality in HCC patients with metastasis showed significant prognostic relevance. We also found that locoregional control for primary liver mass therapy is important in the treatment of sorafenib.
The Eects of Thermal Annealing of ZnO Ceramics
Tae-Bong Hur,Dae-Hwang Yoo,Gwang Soo Jeen,Yoon-Hwae Hwang,Hyung-Kook Kim,Younghun Hwang,Youngho Um 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
We studied the eects of thermal annealing of ZnO ceramics by X-ray photoelectron spectroscopy, photoluminescence and X-ray scattering methods. The ZnO ceramics fabricated from the high purity ZnO powder (99.999 %) were annealed at 950 C in air and in N2 atmosphere. The ZnO ceramics annealed in N2 atmosphere have O-rich condition. The concentration of antisite oxide(OZn) increases when ZnO ceramics have the O-rich condition or N-compensation. As the concentration of antisite oxide(OZn) increases, the photoluminescence intensity of the green band emission increases.
윤상구,김민환,정은숙,한금현,곽이경,조종래,엄태현,김의석 대한감염학회 2007 감염과 화학요법 Vol.39 No.4
삼일열 말라리아는 일반적으로 경미한 임상경과를 거치며, 열대열 말라리아와 달리 뇌형말라리아, 폐부종, 신부전등의 치명적인 합병증을 일으키지 않는 것으로 알려져 있다. 저자들은 특이한 과거력이 없던 건강하던 성인이 국내에서 삼일열 말라리아에 걸린 후 발작과 쇼크가 발생하여, 항말라리아 약제와 대증치료로 치료된 증례를 경험하였다. Vivax malaria reemerged in the Republic of Korea in 1993. Vivax malaria is generally a benign disease with few severe complications. Even in the worldwide literature, there is only a small number of case reports on severe complications in vivax malaria. We report a unique case of P. vivax infection complicated by seizure and shock. A 58 year-old male showed generalized tonic-clonic seizure and shock after P. vivax infection. The species of malarial parasite was identified using peripheral blood film examination and polymerase chain reaction (PCR). He successfully recovered after treatment with hydroxychloroquine.