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Cho, Jaeho,Kim, Gwi Eon,Rha, Koon Ho,Ahn, Joong Bae,Lee, Chang Geol,Suh, Chang-Ok,Seong, Jinsil,Keum, Ki Chang,Kim, Song Ie,Lee, Yoon-Hee The Korean Academy of Medical Sciences 2008 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.23 No.4
<P>A patient with renal cell carcinoma (RCC) developed synchronous bone metastasis with metachronous relapses to the bone and renal fossa. The primary lesion was initially removed surgically, and the metastatic bone lesions and locally recurrent tumours were treated by a high-fractional dose and high-total-dose intensity-modulated radiotherapy (IMRT, 60 Gy at 2.5 Gy per fraction) without significant side effects. All the grossly relapsed tumors underwent complete remission (CR) within a short time after IMRT. To date, CR has been maintained for more than two years. This case study reports the successful treatment of radioresistant RCC using a new scheme that involves a fractionation regimen with a high precision radiotherapy.</P>
The Effects of Heterogeneous Beliefs on a Risky Asset's Price and Trading Volume
Jaeho Cho 서울대학교 경제연구소 1992 Seoul journal of economics Vol.5 No.2
This paper examines the effects of different opinions among investors on a risky asset's price and trading volume in a two-period, two-person general equilibrium setting. A comparative static analysis predicts the following: Assuming that investors differ only in subjective probability beliefs about future security payoffs, an increased dispersion of beliefs will decrease the asset price and increase the trading volume in the empirically plausible range of the relative risk aversion coefficient.
Dynamic Characteristics of Excess Returns in Seoul Housing Market
Jaeho Cho 한국자료분석학회 2021 Journal of the Korean Data Analysis Society Vol.23 No.6
In Korea, the increase in individuals incomes appears to lead to the bigger accumulation of housing assets than in other developed countries. And the accumulation is more concentrated in Seoul, especially in South Seoul. This study analyzes the development process of excess returns of apartment prices in Seoul and South Seoul compared to the national housing price based on the threshold regression model and the ESTAR model. The analysis result shows that excess returns in Seoul and South Seoul increase non-linearly as national income increases. This implies that apartment growth rates in Seoul and South Seoul continue to rise more than in other regions as the economy develops. In this case, the economic wealth will be concentrated in the Seoul area. In addition, if national income enters a high-growth regime with the appreciation of the won, housing investment will be strengthened in the Seoul area. This result implies that the dynamic accumulation of excess returns with a spillover effect from Seoul is the cause of housing instability of non-homeowners and imbalanced regional development.
Low-dose craniospinal irradiation as a definitive treatment for intracranial germinoma
Cho, Jaeho,Choi, Joong-Uhn,Kim, Dong-Seok,Suh, Chang-Ok Elsevier 2009 Radiotherapy and oncology Vol.91 No.1
<P><B>Abstract</B></P><P><I>Purpose:</I> To determine the optimal radiotherapy (RT) dose and volume for treatment of intracranial germinoma.</P><P><I>Materials and methods:</I> Eighty-one intracranial germinoma patients (33 pathologically-verified; 48 presumed by radiosensitivity testing) treated with RT alone between 1971 and 2002 were analyzed. The RT volume varied from focal (13) to whole brain (8), or to the entire neuraxis (60). All the cases after 1982 received craniospinal irradiation (CSI). Radiation dose was reduced gradually during the study period from 59 to 39.3Gy for primary tumors, and from 34.2 to 19.5Gy for the neuraxis. The median follow-up time was 120 months (48–260 months).</P><P><I>Results:</I> Five- and ten-year relapse-free survival rates were 98.8% and 94.1%, respectively. All the recurrences occurred in the patients who received local (4/13) or whole brain RT (1/8). None of the patients who received CSI suffered from a recurrence. Forty-six patients received 45Gy or less to the primary site and 22 patients received less than 20Gy to the spinal axis.</P><P><I>Conclusion:</I> Low-dose CSI-based RT should remain the standard treatment for intracranial germinoma. The RT dose can be reduced to 39.3Gy for primary tumor sites and to 19.5Gy for the spinal axis.</P>
Optimal Savings under Nonexpected Recursive Preferences
Cho, Jaeho 서울대학교 증권금융연구소 1995 증권 금융연구 Vol.1 No.1
Using the nonexpected recursive utility function developed by Epstein and Zin (1989), this paper re-examines the problem of optimal savings under uncertainty. It is shown that the effects on the optimal savings policy of uncertainty, risk aversion, and the mean return depend critically on whether the intertemporal substitution parameter is greater or less than unity. The paper also reports that portfolio decision is not affected by intertemporal substitution. Finally, the sufficient condition for a positive expected value of perfect information (EVPI) is derived in terms of the two preference parameters--the risk aversion coefficient and the intertemporal substitution parameter.