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족관절 인대 손상 치료 동향: 대한족부족관절학회 회원 설문조사 분석
Cho Byung-Ki,Cho Jaeho,Lee Myoungjin,Lee Jun Young,Bae Su-Young 대한족부족관절학회 2022 대한족부족관절학회지 Vol.26 No.1
Purpose: Despite continuous updates of standard treatment guidelines for acute ankle sprain and chronic ankle instability (CAI), in practice preferred treatment protocols vary widely. Based on a Korean Foot and Ankle Society (KFAS) member survey, this study reports current trends in the management of ankle ligament injuries. Materials and Methods: A web-based questionnaire containing 34 questions was sent to all KFAS members in September 2021. Ques- tions mainly addressed clinical experience and preferences for the diagnosis and treatment of ankle ligament injuries. Answers with a prevalence of ≥50% among respondents were considered to reflect tendencies. Results: Eighty-four of the 550 members (15.3%) responded. Answers that showed a tendency were as follows: commonest additional image study (ultrasound), conservative treatment modality (immobilization, oral medication), frequency of surgical treatment (<5 cases per annum), most important factor when deciding on surgical treatment (activity level, e.g., occupation or sport), and commonest sur- gical procedure (open ligament repair). Answers that showed a tendency for CAI were as follows: most important symptom (repeated sprain, giving way), radiological factors (talar tilt, osteochondral lesion, anterior talar translation), and patient factors (occupation, sports activities, recurrent instability after surgery, etc.). For decision making regarding surgical treatment and method, the most preferred surgical procedure was the modified Broström procedure, and the most common repair technique was suture anchor technique. The following were considered poor prognostic factors; generalized laxity, failed previous surgery, cavovarus, severe mechanical instability, heavy work, obesity, and dissatisfaction after surgery because of residual pain. Conclusion: This study updates information regarding current trends in the management of ankle ligament injuries in Korea, and re- veals consensus opinions and variations in approaches to patients with an acute or chronic injury. The divergence of approaches identi- fied indicates the need for further studies to determine standard guidelines and long-term results.
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.
Cho, Jaeho,Chun, Jaeyoul,Kim, Inhan,Choi, Jungsik Hindawi Limited 2017 Mathematical problems in engineering Vol.2017 No.-
<P>This paper investigates the feasibility of quality function deployment, technique for the order of preference by similarity to ideal solution (QFD-TOPSIS) in presenting user preferences for multiple alternatives, such as construction technologies, products, systems, and design solutions, with trade-off technical characteristics (TC). The original QFD as house of quality (HOQ) defines the requirements and features as subjective matrix relations, which cause interpretations to vary across users and limit its industrial applications. QFD-TOPSIS is a new model that combines the benefits of QFD with those of TOPSIS, maintains the subjectivity and objectivity evaluation of the technical characteristics (TC), and rates the preferences by considering users’ individual propensity for requirements. In addition, QFD-TOPSIS rates the preferences through the reciprocal compensation effects of trade-off TC and filters unsuitable alternatives with predefined restrictive conditions. Trade-off refers to conflicts and/or contradictions between attributes, often arising in multicriteria decision-making. Users or project stakeholder groups define the priorities of trade-off TC that directly influence product preferences and decision-making. In the present study, we have developed a Web system based on the QFD-TOPSIS logic and tested its operation to verify its industrial applicability and viability for automatic quality evaluation.</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.