동아시아 사법개혁과 인권

케빈 탄(Kevin Tan) 사회과학원 1996 계간 사상 Vol.31 No.-

Vase Life and Root Propagation of Geraldton Wax (Chamelaucium spp.) Cut Flowers Treated with Glyphosate

Kevin Seaton,Kok Lee,Beng Tan 한국원예학회 2010 Horticulture, Environment, and Biotechnology Vol.51 No.6

Glyphosate [N-(phosphonomethy)glycine] as Roundup<SUP>?</SUP> (360 g · L?¹ a.i.) can render cuttings taken from cut flowers inert and unable to be propagated. It may also affect other plant physiological processes such as the vase life. In this study the effects of glyphosate on vase life and root propagation of cutting taken from cut flowers of Geraldton wax varieties ‘Purple Pride’ (Chamelaucium uncinatum), and ‘Bridal Pearl’ and ‘Albany Pearl’ (C. uncinatum × C. megalopetalum hybrids) were investigated. Cuttings of ‘Purple Pride’ pulsed in a 0.1% Roundup<SUP>?</SUP> (0.36 g · L?¹ glyphosate) solution for 20 minutes failed to produce roots and were dry within 28 days; leaf vase-life also increased by three days with no adverse effect on flower vase life, normally evidenced by accelerated senescence and petal closure. Pulsing in a 1% Roundup<SUP>?</SUP> (3.6 g · L?¹ glyphosate) or 10% Roundup<SUP>?</SUP> (36 g · L?¹ glyphosate) solution for 20 minutes increased flower vase life by 3 to 5 days. Pulsing in Roundup<SUP>?</SUP> solutions for longer durations at these concentrations did not decrease flower vase life below the control, but leaf vase life was reduced from 10 days (control) to between 4 (1% Roundup<SUP>?</SUP> 120 minutes) and 7 days (10% Roundup<SUP>?</SUP> for 60 minutes). A similar result was also found for ‘Bridal Pearl’ except that there was no improvement in flower vase life following a 20 minute pulse in a 0.1% Roundup<SUP>?</SUP> solution. No roots occurred in cuttings taken from flowering stems of ‘Albany Pearl’ pulsed in a 0.1% Roundup<SUP>?</SUP> solution for 20 minutes at 20℃ or immersed in a 0.25% Roundup<SUP>?</SUP> solution for one minute. There was also no reduction in vase life of flowers and leaves of sprigs taken from stems pulsed or immersed in these Roundup<SUP>?</SUP> solutions. A protocol using a 0.1% Roundup<SUP>?</SUP> solution as a 20 minute pulse or a stronger 0.25% Roundup<SUP>?</SUP> solution as a 1-minute immersion should provide an effective postharvest treatment to prevent propagation of cuttings taken from Geraldton wax cut flowers.

Multi-time Scale Coordinated Optimization of New Energy High Permeability Power System Considering Flexibility Requirements

Su Shiwei,Tan Donghong,Li Xianghua,Li Xin,Chen Zitong,Lian Ruiqing,Lenz Soronga Blaise Kevine 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2

The high proportion of grid-connected intermittent energy such as wind power and photovoltaic makes the demand for power system flexibility increase sharply. In order to improve the overall flexibility of new energy high permeability system and enhance the economy of power system, promote the new energy consumption of system. This paper presents a multi-time scale Coordinated optimization strategy for the new energy high permeability power system considering flexibility requirement (MTSCOSFR). This strategy makes full use of the adjustment ability of source-load-storage flexible resources and analyzes system flexibility requirements at different time scales, creates multi-time scale optimization scheduling models, including typical week operation simulation model, typical day operation simulation model, typical period operation simulation model. Puts the profit of carbon trading and the penalty cost of insufficient flexibility into the optimization goal. Adopts the idea of multi-time coordination and step-by-step optimization to solve the model. This paper sets two cases to discuss MTSCOSFR. The results show that the comprehensive cost of the typical weekly operation simulation is reduced to 2360 × 104$, the penalty cost of insufficient flexibility in the typical day operation simulation is reduced by 67%, the flexibility capacity increased by 500 MW, the regulation capacity increased by 300 MW, the ramp margin increased by 1500 MW/(5 min) −1. The proposed strategy can improve system flexibility and promote new energy consumption on the basis of ensuring system economy.

Single Sensor Gait Analysis to Detect Diabetic Peripheral Neuropathy: A Proof of Principle Study

Patrick Esser,Johnny Collett,Kevin Maynard,Dax Steins,Angela Hillier,Jodie Buckingham,Garry D. Tan,Laurie King,Helen Dawes 대한당뇨병학회 2018 Diabetes and Metabolism Journal Vol.42 No.1

This study explored the potential utility of gait analysis using a single sensor unit (inertial measurement unit [IMU]) as a simple tool to detect peripheral neuropathy in people with diabetes. Seventeen people (14 men) aged 63±9 years (mean±SD) with diabetic peripheral neuropathy performed a 10-m walk test instrumented with an IMU on the lower back. Compared to a reference healthy control data set (matched by gender, age, and body mass index) both spatiotemporal and gait control variables were different between groups, with walking speed, step time, and SDa (gait control parameter) demonstrating good discriminatory power (receiver operating characteristic area under the curve >0.8). These results provide a proof of principle of this relatively simple approach which, when applied in clinical practice, can detect a signal from those with known diabetes peripheral neuropathy. The technology has the potential to be used both routinely in the clinic and for tele-health applications. Further research should focus on investigating its efficacy as an early indicator of or effectiveness of the management of peripheral neuropathy. This could support the development of interventions to prevent complications such as foot ulceration or Charcot’s foot.

Effective online large-group teaching in health professions education

Jie Ming Nigel Fong,Li Ping Marianne Tsang,Nigel Choon Kiat Tan,Daniel Salcedo,Kevin Tan 한국의학교육학회 2022 Korean journal of medical education Vol.34 No.2

Online large-group teaching (OLGT), employed to reach a large group of learners in separate physical locations, allows asynchronous learning and facilitates social distancing. While online large-groups can be a powerful and resource-lean means of health professions education, it has challenges and potential pitfalls that may affect the learning process and outcomes. Through a sociomateriality framework, this article describes strategies for effective online large-group teaching in health professions education in three key strands. Firstly, to optimize learning, OLGT sessions should match learning needs with appropriate OLGT platforms, incorporate strategies to sustain learner attention, and accommodate learners of different abilities. Secondly, to develop a learning culture, OLGT must not only focus on cognitive aspects of learning but also build a community of practice, nurture digital professionalism and professional identity. Thirdly, we discuss the avoidance of pitfalls such as cognitive overload of both tutors and learners, technical issues and security risks, mitigating inequities in access to online learning, and the use of program evaluation to plan for sustained improvements. We conclude with a case vignette that discusses the challenges of OLGT and the application of the above strategies in a teaching scenario.

Future Online Radiology Education: The Importance of Curriculum

Mohamed Shah Mohammad Taufik Bin,Yeong Lim Chee,Cheng Lionel Tim-Ee,Ang Jessica,Lishan Yang,Tan Kevin,Lim Choie Cheio Tchoyoson 대한영상의학회 2023 Korean Journal of Radiology Vol.24 No.3

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Development and Psychometric Validation of a Semantic Differential Measure of Character Strengths in a Sample of Singaporean University Students

Chin-Chin Chou,John Keegan,Nicole Ditchman,Fong Chan,Kanako Iwanaga,Cahit Kaya,Kevin Bengtson,Mayu Fujikawa,Soo-Yin Tan 한국상담학회 2021 Journal of Asia Pacific counseling Vol.11 No.1

Positive psychology emerged as a movement in professional psychology that emphasizes the positive psychological aspects of the individual instead of focusing on diagnosis and psychopathology. Peterson and Seligman (2004) developed and validated the 240-item Virtues in Action Inventory of Strengths (VIA-IS) to assess character strengths and virtues that enable optimal human thriving. However, VIA-IS is often considered too long for use by clinicians in their private practices, as well as for researchers interested in conducting positive psychology research. The purpose of the present study was to evaluate the psychometric properties of a 24-item Values in Action Semantic Differential Scale (VIA-SDS) in a sample of 231 Singaporean university students. Exploratory factor analysis revealed a 4-factor measurement structure (Humanity, Optimism, Leadership, and Creativity) with Cronbach’s alpha coefficients ranging from .67 to .88. Three of the four latent variables were positively associated with happiness and negatively related to perceived stress and depression. These findings support the validity of the VIA-SDS for use as a brief clinical assessment instrument by clinicians and researchers to assess character strengths.

The use of tissue fiducial markers in improving the accuracy of post-prostatectomy radiotherapy

Michael Chao,Huong Ho,Daryl Lim Joon,Yee Chan,Sandra Spencer,Michael Ng,Jason Wasiak,Nathan Lawrentschuk,Kevin McMillan,Shomik Sengupta,Alwin Tan,George Koufogiannis,Margaret Cokelek,Farshad Foroudi,T 대한방사선종양학회 2019 Radiation Oncology Journal Vol.37 No.1

Purpose: The aim of this retrospective study was to investigate the use of a radiopaque tissue fiducial marker (TFM) in the treatment of prostate cancer patients who undergo post-prostatectomy radiotherapy (PPRT). TFM safety, its role and benefit in quantifying the set-up uncertainties in patients undergoing PPRT image-guided radiotherapy were assessed. Materials and Methods: A total of 45 consecutive PPRT patients underwent transperineal implantation of TFM at the level of vesicourethral anastomosis in the retrovesical tissue prior to intensity-modulated radiotherapy. Prostate bed motion was calculated by measuring the position of the TFM relative to the pelvic bony anatomy on daily cone-beam computed tomography. The stability and visibility of the TFM were assessed in the initial 10 patients. Results: No postoperative complications were recorded. A total of 3,500 images were analysed. The calculated prostate bed motion for bony landmark matching relative to TFM were 2.25 mm in the left-right, 5.89 mm in the superior-inferior, and 6.59 mm in the anterior-posterior directions. A significant 36% reduction in the mean volume of rectum receiving 70 Gy (rV70) was achieved for a uniform planning target volume (PTV) margin of 7 mm compared with the Australian and New Zealand Faculty of Radiation Oncology Genito-Urinary Group recommended PTV margin of 10 mm. Conclusion: The use of TFM was safe and can potentially eliminate set-up errors associated with bony landmark matching, thereby allowing for tighter PTV margins and a consequent favourable reduction in dose delivered to the bladder and rectum, with potential improvements in toxicities.

Causal Relations between Exposome and Stroke: A Mendelian Randomization Study

Hong-Qi Li,Yi-Wei Feng,Yu-Xiang Yang,Xin-Yi Leng,Prof Can Zhang,Shi-Dong Chen,Kevin Kuo,Shu-Yi Huang,Xue-Qing Zhang,Yi Dong,Xiang Han,Xin Cheng,Mei Cui,Lan Tan,Qiang Dong,Jin-Tai Yu 대한뇌졸중학회 2022 Journal of stroke Vol.24 No.2

Background and Purpose To explore the causal relationships of elements of the exposome with ischemic stroke and its subtypes at the omics level and to provide evidence for stroke prevention. Methods We conducted a Mendelian randomization study between exposure and any ischemic stroke (AIS) and its subtypes (large-artery atherosclerotic disease [LAD], cardioembolic stroke [CE], and small vessel disease [SVD]). The exposure dataset was the UK Biobank involving 361,194 subjects, and the outcome dataset was the MEGASTROKE consortium including 52,000 participants. Results We found that higher blood pressure (BP) (systolic BP: odds ratio [OR], 1.02; 95% confidence interval [CI], 1.01 to 1.04; diastolic BP: OR, 1.03; 95% CI, 1.01 to 1.05; pulse pressure: OR, 1.03; 95% CI, 1.00 to 1.06), atrial fibrillation (OR, 1.18; 95% CI, 1.13 to 1.25), and diabetes (OR, 1.13; 95% CI, 1.07 to 1.18) were significantly associated with ischemic stroke. Importantly, higher education (OR, 0.69; 95% CI, 0.60 to 0.79) decreased the risk of ischemic stroke. Higher systolic BP (OR, 1.06; 95% CI, 1.02 to 1.10), pulse pressure (OR, 1.08; 95% CI, 1.02 to 1.14), diabetes (OR, 1.28; 95% CI, 1.13 to 1.45), and coronary artery disease (OR, 1.58; 95% CI, 1.25 to 2.00) could cause LAD. Atrial fibrillation could cause CE (OR, 1.90; 95% CI, 1.71 to 2.11). For SVD, higher systolic BP (OR, 1.04; 95% CI, 1.00 to 1.07), diastolic BP (OR, 1.06; 95% CI, 1.01 to 1.12), and diabetes (OR, 1.22; 95% CI, 1.10 to 1.36) were causal factors. Conclusions The study revealed elements of the exposome causally linked to ischemic stroke and its subtypes, including conventional causal risk factors and novel protective factors such as higher education.

The use of tissue fiducial markers in improving the accuracy of post-prostatectomy radiotherapy

Chao, Michael,Ho, Huong,Joon, Daryl Lim,Chan, Yee,Spencer, Sandra,Ng, Michael,Wasiak, Jason,Lawrentschuk, Nathan,McMillan, Kevin,Sengupta, Shomik,Tan, Alwin,Koufogiannis, George,Cokelek, Margaret,Foro The Korean Society for Radiation Oncology 2019 Radiation Oncology Journal Vol.37 No.1

Purpose: The aim of this retrospective study was to investigate the use of a radiopaque tissue fiducial marker (TFM) in the treatment of prostate cancer patients who undergo post-prostatectomy radiotherapy (PPRT). TFM safety, its role and benefit in quantifying the set-up uncertainties in patients undergoing PPRT image-guided radiotherapy were assessed. Materials and Methods: A total of 45 consecutive PPRT patients underwent transperineal implantation of TFM at the level of vesicourethral anastomosis in the retrovesical tissue prior to intensity-modulated radiotherapy. Prostate bed motion was calculated by measuring the position of the TFM relative to the pelvic bony anatomy on daily cone-beam computed tomography. The stability and visibility of the TFM were assessed in the initial 10 patients. Results: No postoperative complications were recorded. A total of 3,500 images were analysed. The calculated prostate bed motion for bony landmark matching relative to TFM were 2.25 mm in the left-right, 5.89 mm in the superior-inferior, and 6.59 mm in the anterior-posterior directions. A significant 36% reduction in the mean volume of rectum receiving 70 Gy (rV₇₀) was achieved for a uniform planning target volume (PTV) margin of 7 mm compared with the Australian and New Zealand Faculty of Radiation Oncology Genito-Urinary Group recommended PTV margin of 10 mm. Conclusion: The use of TFM was safe and can potentially eliminate set-up errors associated with bony landmark matching, thereby allowing for tighter PTV margins and a consequent favourable reduction in dose delivered to the bladder and rectum, with potential improvements in toxicities.