한국 주식시장에서의 개별주식 변동성에 관한 연구 : 기업고유위험(Idiosyncratic risk)의 실증적 분석을 중심으로

학위논문(석사)--서울대학교 대학원 :경영학과 경영학전공,2001.Maste

WPKI기반의 E2E 보안 WALS에 관한 연구

學位論文(碩士)--亞州大學敎大學院 :컴퓨터工學科,2001textMaste

독시플루리딘의제조방법

본 발명은 항암제인 독시플루리딘의 새로운 합성방법에 관한 것으로서 보다 상세하게는 2',3'-아세틸-5-플루오로유리딘을 메탄설포닐 클로라이드로 메실화시켜 2',3'-아세틸-5'-메실-5-플루오로유리딘을 합성하고, 여기에 금속아연과 요오드화 나트륨으로 반응시켜 2',3'-아세틸-5'-디옥시-5-플루오로유리딘을 합성하고 이것을 탈보호화시켜서 독시플루리딘을 합성하는 것을 특징으로 하는 독시플루리딘 제조 방법에 관한 것이다. 또한 본 발명인 독시플루리딘을 합성하는데 있어서 저가이면서 독성이 적은 메탄설포닐 클로라이드, 금속아연, 요오드화 나트륨 외에 초음파를 사용함으로써 독시플루리딘의 수율을 높일 수 높다

아릴 설페닐 클로리드를 이용한 효과적인 핵산의 보호화

학위논문(석사) - 한국과학기술원 : 화학과, 1992.2, [ viii, 56 p. ]Developments of efficient protecting groups are very important in the synthesis of oligonucleotides and sugar modifications. The arylsulfenates have been found to be versatile blocking groups for the hydroxyl functions such as sugar hydroxyls and for the amide moieties in nucleotides. 2``,3``,5``-Tri-O-acetyluridine or purine derivatives were treated with sodium hydride in acetonitrile or tetrahydrofuran at 20$^\circ$C and then followed by the addition of arylsulfenyl chlorides to result in the corresponding arylsulfenates at 4-position or at 6-position of purine selectively in excellent yields (90-95\%). Deblocking was easily performed at 20$^\circ$C by treating with thiophenol or with silica gel.한국과학기술원 : 화학과

인수 인식에서의 산만 감소를 통한 정량적 질의응답 성능 향상

학위논문(석사) - 한국과학기술원 : 전산학부, 2024.2,[iv, 36 p. :]Quantitative question answering, which utilizes long-form documents containing tables and textual data, is being actively studied in finance. To deal with long-form documents, such as financial statements, an architecture combining a retriever and a generator is typically used. The retriever finds evidence sentences in a given document, while the generator recognizes the proper arguments and produces an answer program. However, argument recognition suffers from a distraction problem since evidence sentences retrieved from financial statements contain many numerical data that could be candidate arguments. To address this problem, it is necessary to supervise which of the candidate arguments are required to the answer program during the generator's training process. In this paper, we propose an approach for training a generator in argument recognition by focusing on the probabilities in a candidate generation so that the arguments comprising the ground-truth have higher weights. The proposed approach consists of an argument aggregator to model the probabilities in each candidate generation, and an argument set loss to compute the cross-entropy between that probabilities and the candidates' existence in the ground-truth in terms of the argument set. In our experiments, we show performance improvements of 3.62% and 3.98% in execution accuracy and program accuracy, respectively, over the existing FinQANet model based on a financial quantitative question answering dataset. Also, we observed that the similarity of argument sets between the generated program and the ground truth improved by about 2.9%, indicating a mitigation of the distraction problem.한국과학기술원 :전산학부

배당할인모형의 실증적 의미

학위논문(석사) - 한국과학기술원 : 경영정책학과, 1994.2, [ i, 48 p. ]A simple model asserts that real stock price equals the present value of rationally expected or optimally forecasted future real dividends discounted at a constant real discount rate. It has often been claimed in popular discussions that stock price seems too volatile compared to what is implied by the dividend discount model. Multiperiod equilibrium models are employed to determine the firm value. Then the stock price per share can be directly computed from the firm value and the number of shares. Given the aggregate payout, firms can choose many different dividend policies. According to each dividend policy, the stock price per share and the dividend per share would be fluctuated differently. We simulate our model by generating the aggregate payout under the different assumptions of stochastic process and investors`` utility functions. Like Shiller, we compare the variance of real stock index with that of the discounted value of actual subsequent dividends by assuming a dividend policy and the stochastic process of aggregate payout of firms. We conclude that Var(P(t)^\star) << Var(P(t)) can be possible even if the dividend discount model is correct.한국과학기술원 : 경영정책학과

금속 카벤을 이용한 뉴클레오시드의 입체선택적 합성

학위논문(박사) - 한국과학기술원 : 화학과, 2000.8, [ vii, 133 p. ]한국과학기술원 : 화학과