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Spurious Mean-Reversion of Stock Prices in the State-Space Model
최원혁(Won Hyeok Choi),전덕빈(Duk Bin Jun),김동수(Dong Soo Kim),노재선(Jaesun Noh) 한국경영과학회 2011 韓國經營科學會誌 Vol.36 No.1
In order to explain the U-shaped pattern of autocorrelations of stock returns i.e., autocorrelations starting around 0 for short-term horizons and becoming negative and then moving toward 0 for long-term horizons, researchers suggested the use of a state-space model consisting of an I(1) permanent component and an AR(1) stationary component, where the two components are assumed to be independent. They concluded that auto-regression coefficients derived from the state-space model follow a U-shape pattern and thus there is mean-reversion in stock prices. In this paper, we show that only negative autocorrelations are feasible under the assumption that the permanent component and the stationary component are independent in the state-space model. When the two components are allowed to be correlated in the state-space model, we show that the sign of the auto-regression coefficients is not restricted as negative. Monthly return data for all NYSE stocks for the period from 1926 to 2007 support the state-space model with correlated noise processes. However, the auto-regression coefficients of the ARIMA process, equivalent to the state-space model with correlated noise processes, do not follow a U-shaped pattern, but are always positive.
김주성(Joo Sung Kim),최문석(Moon Seok Choi),이준혁(Joon Hyoek Lee),고광철(Kwang Cheol Koh),백승운(Seung Woon Paik),박유정(Yu Jeong Park),최원혁(Won Hyeok Choe),홍일철(Il Chul Hong),이춘영(Choon Young Lee),이종철(Jong Chul Rhee),최규 대한소화기학회 2002 대한소화기학회지 Vol.39 No.1
Neurilemmomas are neurogenic tumors that arise from schwann cells of nerve roots. They commonly occur in the head and neck, extremity, mediastinum, and retroperitoneum area, but rarely, they occur in the gastrointestinal tract. In the gastrointestinal tract, the most common site is the stomach. They also occur in the small intestine, mesentery, and appendix. Recently, we have experienced a very rare case of neurilemmoma arising from the hepaticoduodenal ligament. We report this case with a review of literature. (Korean J Gastroenterol 2002;39:68-70)
간세포암의 고주파 열치료 후 재발 양상과 이와 관련된 인자
안병훈(Byeong Hoon Ahn),최문석(Moon Seok Choi),이준행(Jun Haeng Lee),임윤정(Yun Jeong Lim),홍일철(Il Chol Hong),최원혁(Won Hyeok Choe),이준혁(Joon Hyoek Lee),고광철(Kwang Cheol Koh),백승운(Seung Woon Paik),이풍렬(Poong Lyul Rhee) 대한소화기학회 2001 대한소화기학회지 Vol.38 No.5
Background/Aims: There were few reports about the recurrence and related factors after radiofrequency ablation (RFA) in unresectable hepatocellular carcinoma (HCC). We assessed the recurrence rate and its related factors after RFA in patients with HCC. Methods: Thirty-nine patients (32 males and 7 females) with unresectable HCC were treated with percutaneous ultrasono-guided RFA. They had solitary tumor ≤4 cm or multiple tumor (≤3 in number and ≤3 cm in diameter) without history of transarterial chemoembolization or percutaneous ethanol injection therapy within 6 months. Results: The complete necrosis rate was 91.4% with few significant complications. Local and remote recurrence of HCC were observed in 30.7% and 66% of the patients during follow-up period of median 17 months. One-year local recurrence rate was lower in tumor smaller than 2.5 cm than in tumor bigger than 2.5 cm (5.6% vs. 28.5%, p=0.01). It was also lower in single tumor than in multiple tumor (12% vs. 60%, p=0.04). One-year remote recurrence rate was lower in Child A than in Child B (43.4% vs. 66.7%, p=0.04). Conclusions: RFA results in a high rate of complete necrosis with few significant complications in unresectable HCC. The local recurrence was fewer in small, single tumor and the remote recurrence was fewer in patients with Child A. (Korean J Gastroenterol 2001;38:350-356)
만성 B형간염 환자에서 아데포비어 투여에 의한 골연화증
안수영 ( Su Young Ahn ),고순영 ( Soon Young Ko ),장윤미 ( Yun Mi Jang ),최용훈 ( Yong Hoon Choi ),김병국 ( Byung Kook Kim ),최원혁 ( Won Hyeok Choe ),이창홍 ( Chang Hong Lee ),권소영 ( So Young Kwon ) 대한소화기학회 2010 대한소화기학회지 Vol.56 No.2
Adefovir dipivoxil, an acyclic nucleoside analogue, has been approved for the treatment of patients with chronic hepatitis B. This agent is efficacious particularly in those who have developed lamivudine resistance. The report according to hypophosphatemia induced by low dose adefovir therapy is very rare. We report one case in which osteomalacia with hypophosphatemia developed in a patient with chronic hepatitis B on adefovir dipivoxil at a low dose, 10 mg daily. A 66-year-old man, who had been taking adefovir for more than 4 years due to lamivudine resistance, presented with muscle weakness and bone pain in both thighs. After 3 years of adefovir therapy, hypophosphatemia and elevated serum alkaline phosphatase levels had been noted. A bone scan showed multiple hot uptakes. All the image findings and clinical symptoms, such as bone pain and muscle weakness were improved after correcting the hypophosphatemia with oral phosphorous supplementation. (Korean J Gastroenterol 2010;56:117-120)
보문: 백색부후균에 의한 합성염료의 탈색과 리그닌분해 효소의 생산
구본준 ( Bon Joon Gu ),김민식 ( Min Sik Kim ),김인만 ( Yin Man Kim ),김선웅 ( Seon Woong Kim ),최원혁 ( Won Hyeok Choi ),이미화 ( Mi Hwa Lee ),조해진 ( Hae Jin Cho ),이태수 ( Tae Soo Lee ) 한국균학회 2012 韓國菌學會誌 Vol.40 No.2
본 연구에서는 백색부후균 중 줄버섯, 단색털구름버섯, 산느타리 및 유관버섯 등의 균사체를 이용하여 congored, amaranth, orange G 및 methylene blue 등의 합성염료 탈색에 관한 실험을 수행하였다. 실험 결과 줄버섯과 단색털구름버섯은 congored가 함유된 고체와 액체배지에서 이들 염료를 93~95% 탈색하였으며 amaranth는 약80%, orange G는 62~70% 탈색시키는 것으로 나타났으나 유관버섯에 의한 3종류의 염료 탈색율은 30% 내외로 매우 낮았다. congo red, amaranth 및 orange G 등 각각의 염료가 첨가된 배지에서의 염료 탈색율은 이들 배지에서 배양한 균사체의 생장과 상관관계가 있는 것으로 나타났다. 그러나 모든 공시 균주는 methylene blue가 함유된 고체와 액체배지에서 methylene blue를 효과적으로 탈색하지 못하는 것으로 나타났다. 공시된 백색부후균의 액체 배지에서의 리그닌 분해효소 생산을 탐색하기 위해 1%의 나프탈렌이 첨가된 PDB 배지에 공시균을 10일 간 배양 후 효소의 종류와 양을 분석한 결과 모든 공시균은 laccase, lignin peroxidase 그리고 manganese peroxidase 등의 효소를 생산하는 것으로 확인되었으며 공시균주 중줄버섯이 리그닌 분해 효소의 생산이 가장 왕성한 것으로 나타났다. This study has been conducted to screen the decolorization of 4 aromatic synthetic dyes and production of ligninolytic enzymes by 4 white rot fungi such as Bjerkanderia adusta, Cerrena unicolor, Pleurotus pulmonarius and Abortiporus biennis. It was found that B. adusta, C. unicolor, and P. pulmonarius have the ability to efficiently decolorize congo red and moderately decolorized amaranth and orange G in solid and liquid culture media. However, the decolorization rate of 4 synthetic dyes by A. biennis was relatively low. The decolorization of congo red, amaranth, orange G were related to the growth rate of the fungal mycelia in the solid medium. But, the all fungi tested did not efficiently decolorize methylene blue in the liquid culture media. To investigate the production of ligninolytic enzymes in media containing aromatic compounds, fungi were cultured in 1% naphthalene supplemented potato dextrose broth medium. All fungi tested had the capability to produce laccase, lignin peroxidase and manganese peroxidase, and B. adusta was the best ligninolytic enzymes producing white rot fungus among other fungi tested.