The Effects of Urban Redevelopment on Neighbourhood Housing Prices

Chiu On Ki,Wadu Mesthrige Jayantha 서울시립대학교 도시과학연구원 2010 도시과학국제저널 Vol.14 No.3

The topic of neighbourhood improvement is central to residential appraisal. The study empirically investigates how the redevelopment affects the housing values in the vicinity. Using price gradient approach based on hedonic pricing model, we study the effects of an urban redevelopment project on housing property prices during the pre-redevelopment stage, construction stage and post-redevelopment stage. The results show that there were significant increases in property prices between before implementation and after completion of the redevelopment project. Property value enhancements well ahead of the actual project completion are also observed. It suggests that redevelopment has brought overall improvements to the surrounding properties and the expectation of these advantages was taken into consideration in the pricing of the properties during the construction phase. In addition, the changes in housing price gradients reveal that the effects of redevelopment varied with proximity between the properties and the redeveloped site. Properties which have the closest proximity with the redevelopment are found to have experienced greater increase in price after redevelopment but less extent of price rise during construction. It is important for urban planners to carefully consider the externalities of redevelopment received by properties in different locations, in order to maximize the positive impacts of redevelopment on the neighbourhood.

특수수용가의 고조파전압 왜형현황과 고조파 관리 방안

황치우(Chiu Hwang),성기철(Ki Cheul Seung) 대한전기학회 1997 대한전기학회 학술대회 논문집 Vol.1997 No.7

International Digestive Endoscopy Network consensus on the management of antithrombotic agents in patients undergoing gastrointestinal endoscopy

Seung Joo Kang,Chung Hyun Tae,Chang Seok Bang,Ki-Nam Shim,Cheol Min Shin,Young-Hoon Jeong,Miyoung Choi,Joo Ha Hwang,Yutaka Saito,Philip Wai Yan Chiu,Rungsun Rerknimitr,Christopher Khor,Vu Van Khien,Ke 대한소화기내시경학회 2024 Clinical Endoscopy Vol.57 No.2

Antithrombotic agents, including antiplatelet agents and anticoagulants, are widely used in Korea because of the increasing incidence of cardiocerebrovascular disease and the aging population. The management of patients using antithrombotic agents during endoscopic procedures is an important clinical challenge. The clinical practice guidelines for this issue, developed by the Korean Society of Gastrointestinal Endoscopy, were published in 2020. However, new evidence on the use of dual antiplatelet therapy and direct anticoagulant management has emerged, and revised guidelines have been issued in the United States and Europe. Accordingly, the previous guidelines were revised. Cardiologists were part of the group that developed the guideline, and the recommendations went through a consensus-reaching process among international experts. This guideline presents 14 recommendations made based on the Grading of Recommendations, Assessment, Development, and Evaluation methodology and was reviewed by multidisciplinary experts. These guidelines provide useful information that can assist endoscopists in the management of patients receiving antithrombotic agents who require diagnostic and elective therapeutic endoscopy. It will be revised as necessary to cover changes in technology, evidence, or other aspects of clinical practice.

No difference in long-term functional outcomes or survivorship after total knee arthroplasty with or without computer navigation: a 17-year survivorship analysis

( Ng Jonathan Patrick ),( Lau Lawrence Chun Man ),( Chau Wai-wang ),( Ong Michael Tim-yun ),( Cheung Kin Wing ),( Chiu Kwok Hing ),( Chung Kwong Yin ),( Ho Kevin Ki-wai ) 대한슬관절학회 2021 대한슬관절학회지 Vol.33 No.-

Background: The literature comparing the long-term outcomes and survivorship of computer navigation-assisted and conventional total knee replacement (TKR) is sparse. Moreover, of the available comparative studies with followup duration of more than 10 years, the results seem to be conflicting. The purpose of this long-term study was to compare the clinical and radiological outcomes, and implant survivorship, of TKR performed with and without computer navigation. Methods: We retrospectively compared the results of 49 computer-navigated TKRs and 139 conventional TKRs. The mean age of the patients was 67.9 (range 52-81) years for the navigation group and 67.1 (range 50-80) years for the conventional TKR group. The mean duration of follow-up for the conventional and navigation TKR groups was 12.9 and 13.2 years, respectively. Clinical and radiographic follow-up examinations of the patients were performed at 2 weeks, 1 month, 3 months and 6 months post-operatively, and at 1-year intervals thereafter. Results: There were no significant differences in the post-operative Knee Society knee and function score between the two groups. The mean overall deviation from neutral alignment and the radiological outliers were significantly higher in the conventional TKR group. The overall survival rates at 17 years were 92.9% for the navigation group and 95.6% for the conventional TKR group (p = 0.62). Conclusions: Navigated TKR resulted in fewer radiological outliers; however, this did not translate to better long-term functional outcomes or implant survival.

Study on Treatment Planning for the Prostate in Proton Therapy with Oxygen Enhancement Ratio Effect

Yoo Seung Hoon,Geng Hui,Lam Wai Wang,Kong Chi Wah,Yang Bin,Chiu Tin Lok,Wu Po Man,Cheung Kin Yin,Yu Siu Ki,Shin Dongho,Min Byung Jun 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.7

The purpose of this study was to investigate the oxygen enhancement ratio (OER) effects on treatment planning for a hypoxic prostate tumor with proton scanning beams. Two different OER-based dose calculation models (the average model and the voxel model) were investigated by using hypoxic tumor models in this simulation study. For the hypoxic tumor model, an oxygen distribution with a range of 2.4-9.4 mmHg was used according to the clinical data. The results given by the average model and the voxel model were compared for 50% and 90% tumor control probabilities with variations in the hypoxic tumor volume and fractionation. Comparison between the treatment plans with OER-based higher predicted dose and with the conventional prescription dose was conducted to investigate the organ-at-risk (OAR) doses for the prostate case. The average model showed a higher calculated dose than the voxel model. The voxel model with a 50% control probability showed good agreement with the current prescription dose. The OER values of the average model ranged from 1.05 to 1.25, which were applied to the whole tumor volume in treatment planning. The voxel-model-based OERs were higher (1.50-1.75) than those of average model, and these OERs should be applied only for the hypoxic boost region. Regarding treatment plans, the doses of the rectum and the bladder were reduced to the tolerable range V80Gy (volume receiving equal to or greater than 80Gy) < 15% and V75Gy (volume receiving equal to or greater than 75Gy) < 15% respectively after an optimization, but the maximum dose to femoral heads was higher than 50 Gy. In conclusion, we investigated the possible ranges of the OER (1.3-1.8) for proton-beam treatment of prostate cases. A dose escalation of up to about 1.8 times can be applied for the small hypoxic region. This result, which was obtained using a model study, should be verified through clinical experiment.

Prospective randomized trial comparing efficacy and safety of intravenous and intra-articular tranexamic acid in total knee arthroplasty

Li Moses Man-Lung,Kwok Jojo Yan-Yan,Chung Kwong-Yin,Cheung Kin-Wing,Chiu Kwok-Hing,Chau Wai-Wang,Ho Kevin Ki Wai 대한슬관절학회 2020 대한슬관절학회지 Vol.32 No.-

Total knee arthroplasty (TKA) is associated with significant perioperative blood loss and postoperative allogenic blood transfusion. Tranexamic acid (TXA) reversibly blocks lysine binding sites on plasminogen molecules and inhibits plasmin formation. Comparisons of the efficacy and safety of intra-articular and intravenous TXA in primary TKA have not previously been reported.A prospective randomized trial was conducted in 150 patients who underwent TKA, and these patients were randomized into three groups. Patients in Group A were injected by intra-articular TXA according to body weight (20 mg/kg). Patients in Group B received a standard dose of intra-articular TXA (2000 mg), and those in Group C were infused with TXA according to body weight (20 mg/kg) before tourniquet deflation and again 3 h later. Baseline characteristics and data collected at blood transfusion were compared. Differences among four time points (baseline, day 0, day 2, and day 5) were carried out using ANOVA. The hemoglobin levels at postoperative day 5 were 10.6 g/dL for Group A, 10.6 g/dL for Group B, and 10.7 g/dL for Group C. The drain output was 399 ml for Group A, 314 ml for Group B, and 305 ml for Group C ( p = 0.03). Group C had significantly less drain output than Group A after post hoc comparisons ( p = 0.05), whereas no significant difference was observed between Group A and B ( p = 0.09) or between Group B and C. The weight-adjusted dose of TXA administered intravenously significantly reduced the drain output but not the total blood loss when compared with the weight-adjusted dose of TXA administered intra-articularly. No significant difference was observed in the other parameters among the three groups. The Joint CUHK-NTEC CREC, CRE-2013.644-T . Registered 1 March 2014.