43 research outputs found

    μˆœν™˜μ‹ κ²½λ§ 기반 λΉ„μ„ ν˜• ARMA-GARCH λͺ¨ν˜•μ„ μ΄μš©ν•œ S&P500 μ§€μˆ˜ 예츑

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    ν•™μœ„λ…Όλ¬Έ(석사)--μ„œμšΈλŒ€ν•™κ΅ λŒ€ν•™μ› :μžμ—°κ³Όν•™λŒ€ν•™ 톡계학과,2019. 8. 이상열.A nonlinear ARMA-GARCH model is proposed for forecasting daily stock market returns. The only difference from the linear ARMA-GARCH is the conditional mean component. Two parameters are added and the hyperbolic tangent function is utilized to give a nonlinearity. The nonlinear ARMA-GARCH is solved by the recurrent neural network concept. In order to show the practical applicability of the proposed nonlinear ARMA-GARCH model, daily algorithmic trading is carried out with historical S&P500 daily closing index from 1950 to 2018. It is shown that the proposed nonlinear ARMA-GARCH model outperforms the linear ARMA-GARCH model in terms of financial and statistical measures.일별 μ£Όκ°€ μ˜ˆμΈ‘μ„ μœ„ν•œ μˆœν™˜μ‹ κ²½λ§ 기반 λΉ„μ„ ν˜• ARMA-GARCH λͺ¨ν˜•μ΄ μ œμ•ˆλ˜μ—ˆλ‹€. 기본적인 μ„ ν˜• ARMA-GARCH λͺ¨ν˜•μ— 두 개의 λͺ¨μˆ˜κ°€ 더해지고 μŒκ³‘νƒ„μ  νŠΈν•¨μˆ˜λ₯Ό μ΄μš©ν•˜μ—¬ λΉ„μ„ ν˜•μ„±μ΄ μΆ”κ°€λœ λͺ¨ν˜•μ΄λ‹€. μ œμ•ˆλœ λΉ„μ„ ν˜• ARMA-GARCH λͺ¨ν˜•μ˜ ν•΄λŠ” μˆœν™˜μ‹ κ²½λ§ κ°œλ…μ„ μ΄μš©ν•˜μ—¬ μ–»μ—ˆλ‹€. μ œμ•ˆλœ λͺ¨ν˜•μ˜ ν˜„μ‹€μ  적용 κ°€λŠ₯성을 보이기 μœ„ν•˜μ—¬ 1950λ…„λΆ€ν„° 2018λ…„κΉŒμ§€ S&P500 μ§€μˆ˜μ˜ 일별 μ’…κ°€λ₯Ό μ΄μš©ν•˜μ—¬ μ•Œκ³ λ¦¬μ¦˜ 기반 거래λ₯Ό μˆ˜ν–‰ν•˜μ˜€λ‹€. 금육 및 톡계적 μΈ‘λ„λ‘œ λΉ„κ΅ν•˜μ˜€μ„ λ•Œ μ œμ•ˆλœ λΉ„μ„ ν˜• ARMA-GARCH λͺ¨ν˜•μ΄ 기쑴의 μ„ ν˜• ARMA-GARCH λͺ¨ν˜•λ³΄λ‹€ 뛰어남을 λ³΄μ˜€λ‹€.Abstract i List of Figures iii List of Tables iv Chapter 1 Introduction 1 Chapter 2 Data Description 3 Chapter 3 Model Description 6 3.1 Nonlinear ARMA-GARCH Model 7 3.2 Recurrent Neural Networks Structure 8 3.3 Model Selection 10 3.4 Trading Strategies 12 Chapter 4 Results 13 Chapter 5 Concluding Remarks 17 Bibliography 18 ꡭ문초둝 22Maste

    Clinical outcomes of hepatitis B virus infection are not associated with Fas and FasL gene polymorphisms

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    Thesis(master`s)--μ„œμšΈλŒ€ν•™κ΅ λŒ€ν•™μ› :μ˜ν•™κ³Ό λΆ„μžμœ μ „μ²΄μ˜ν•™μ „κ³΅,2006.Maste

    Transmission electron microscopic and immunohistochemical study of transverse carpal ligaments in patients with carpal tunnel syndrome

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    ν•™μœ„λ…Όλ¬Έ(박사)--μ„œμšΈλŒ€ν•™κ΅ λŒ€ν•™μ› :μ˜ν•™κ³Ό μ •ν˜•μ™Έκ³Όν•™μ „κ³΅,2001.Docto

    λ§ˆμΌ€νŒ… μ‹œμŠ€ν…œκ³Ό ι—œδΏ‚εŒ– 戰η•₯의 ι©εˆζ€§μ— κ΄€ν•œ 瑏穢

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    ν•™μœ„λ…Όλ¬Έ(석사)--μ„œμšΈε€§ε­Έζ ‘ 倧學陒 :ηΆ“η‡Ÿε­Έη§‘ ηΆ“η‡Ÿε­Έε°ˆζ”»,1996.Maste

    Interaction between HBV replication and miR-17-92 expression in human hepatoma cells

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    MicroRNAs (miRNAs) regulate post-transcriptional gene expression in various physiologic and pathologic biological processes. The miR-17-92 cluster encodes six miRNAs (miR-17, miR-18a, miR-19a, miR-19b, miR-20a, and miR-92-1) which are transactivated by c-Myc. Previous studies reported that hepatitis B virus (HBV), the main cause of chronic viral hepatitis in Korea, transactivates c-Myc. The purposes of this study were to examine the effect of HBV replication on the miR-17-92 expression, and to determine whether miR-17-92 regulates HBV replication. The expression of miR-17-92 was examined in HepAD38 cells that permit conditional replication of HBV by real-time quantitative PCR and Northern blot analysis. HBV relaxed circular DNA and pregenomic RNA levels were quantified in HepAD38 cells that were transfected with either miR-17-92 expression plasmids or antisense peptide nucleic acids against miR-17-92. Induction of HBV replication up-regulated transcription of miR-17-92 in HepAD38 cells. Moreover, miR-20a was up-regulated in liver tissues from chronic hepatitis B patients compared to control liver tissues without active HBV infection. Induction of HBV replication up-regulated c-Myc expression in HepAD38 cells, and HBV-induced overexpression of miR-17-92 was reversed by lentivirus-mediated RNA interference of c-Myc. Overexpression of miR-17-92 did not influence HBV replication significantly, whereas antisense peptide nucleic acids against miR-17-92 augmented HBV replication. Luciferase reporter assays confirmed direct interaction between miR-17-92 and potential target sequences on the HBV genome. These results demonstrate that HBV up-regulates miR-17-92 expression via c-Myc, and in turn, the miR-17-92 polycistron restricts replication of HBV in HepAD38 cells. These novel findings suggest negative feedback regulation of HBV by the miR-17-92 cluster.마이크둜 RNAs (miRNAs)λŠ” 단일가λ‹₯의 RNA λΆ„μžλ‘œμ„œ λ©”μ‹ μ € RNA (mRNA)에 μ—ΌκΈ°μŒμ„ μ΄λ£¨λ©΄μ„œ 전사 ν›„μ˜ 진핡 μƒλ¬Όμ˜ μœ μ „μžλ°œν˜„μ„ μ œμ–΄ν•˜λŠ” μƒˆλ‘œμš΄ 쑰절물질둜 세포 증식, λΆ„ν™”, 세포 사멸, μ•”ν™” 과정에 κ΄€μ—¬ν•˜λŠ” κ²ƒμœΌλ‘œ μ•Œλ €μ Έ μžˆλ‹€. MiR-17-92 ν΄λŸ¬μŠ€ν„°λŠ” 6개의 miRNA (miR-17, miR-18a, miR-19a, miR-19b, miR-20a, and miR-92-1) λ°œν˜„ν•˜λŠ” λŒ€ν‘œμ μΈ μ•”κ΄€λ ¨ miRNA둜 간세포암을 ν¬ν•¨ν•œ μ—¬λŸ¬ μ•” μ—μ„œ κ·Έ 역할이 μ‘°λͺ…을 λ°›μ•„ μ™”λ‹€. 특히 κ°„μ„Έν¬μ•”μ—μ„œλŠ” c-Myc μœ μ „μžμ— μ˜ν•œ 전사촉진 (transactivation) 에 μ˜ν•΄ miR-17-92이 κ³Όλ°œν˜„λ¨μ΄ λ°ν˜€μ‘Œλ‹€. 이 μ—°κ΅¬μ˜ λͺ©μ μ€ miR-17-92와 Bν˜• κ°„μ—Ό λ°”μ΄λŸ¬μŠ€ (Hepatitis B virus, HBV)의 μƒν˜Έμž‘μš© 및 λ§€κ°œμžλ‘œμ„œμ˜ c-Mycμœ μ „μžμ˜ 역할을 ν™•μΈν•˜λŠ” 것이닀. HBV의 증식이 miR-17-92에 λ―ΈμΉ˜λŠ” 영ν–₯을 ν™•μΈν•˜κΈ° μœ„ν•΄μ„œ HepAD38 간암세포주λ₯Ό μ‚¬μš©ν•˜μ˜€μœΌλ©°, c-Myc의 역할을 ν™•μΈν•˜κΈ° μœ„ν•΄μ„œ λ Œν‹°λ°”μ΄λŸ¬μŠ€λ₯Ό μ΄μš©ν•œ short-hairpin RNA 맀개 knockdown 방법을 μ΄μš©ν•˜μ˜€λ‹€. λ˜ν•œ HepAD38 μ„Έν¬μ£Όμ—μ„œ miR-17-92λ₯Ό κ³Όλ°œν˜„ λ˜λŠ” μ–΅μ œλ₯Ό μ‹œμΌœ 세포내 HBV 증식에 λ―ΈμΉ˜λŠ” 영ν–₯을 ν™•μΈν•˜μ˜€λ‹€. HBVλŠ” miR-17-92의 전사λ₯Ό 촉진함을 ν™•μΈν•˜μ˜€μœΌλ©°, μ΄λŠ” c-Myc에 μ˜ν•΄μ„œ λ§€κ°œλ¨μ„ 밝힐 수 μžˆμ—ˆλ‹€. ν•œνŽΈ miRNA λ°œν˜„ ν”ŒλΌμ¦ˆ λ―Έλ“œλ₯Ό μ΄μš©ν•˜μ—¬ miR-17-92λ₯Ό κ³Όλ°œν˜„ μ‹œμΌ°μ„ λ•Œ HBV의 μ¦μ‹μ˜ λ³€ν™”λŠ” μ—†μ—ˆμœΌλ‚˜ peptide nucleic acidλ₯Ό μ΄μš©ν•˜μ—¬ miR-17-92을 μ–΅μ œ μ‹œμΌ°μ„ λ•Œ HBV의 증식이 항진됨을 ν™•μΈν•˜μ˜€λ‹€. Luciferase reporter analysisλ₯Ό ν†΅ν•˜μ—¬ miR-17-92이 HBV의 전사체에 직접 μž‘μš©ν•¨μ„ 확인 ν•˜μ˜€λ‹€. λ³Έ 연ꡬλ₯Ό ν†΅ν•˜μ—¬ miR-17-92와 HBV의 μƒν˜Έμž‘μš©μ„ ν™•μΈν•˜μ˜€μœΌλ©° miR-17-92κ°€ HBV의 μžμ—°κ²½κ³Ό 및 간세포암과 κ΄€λ ¨λœ λ³‘νƒœμƒλ¦¬ν•™μ  기전에 κ΄€μ—¬ν•  수 μžˆμŒμ„ λ³΄μ—¬μ£Όμ—ˆλ‹€.Docto

    High Performance of Organic Complementary Inverters Using Monolayer Graphene Electrodes

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