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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>
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>
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.
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,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>