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DISCRETE GROUPS ACTING ON S³ x Rⁿ
Lee, Jong Bum,Lee, Kyung Bai,Frank Raymond TOPOLOGY AND GEOMETRY RESEARCH CENTER 1993 Proceedings of the Topology and Geometry Research Vol.3 No.-
We study the Seifert fiber space constructions modelled on the product space S3 x W in terms of Lee and Raymond's characterization ([LR2]), and show that if a discrete group Q acts properly discontinuously on a space W, then the trivial extension S3 x Q is the only extension of S3 by Q that can act weakly S3 -equivariantly on S3 x W. When Q is a discrete group acting properly on R² with compact quotient, the discrete groups acting on S3 x R² as a group of weakly S3 -equivariant homeomorphisms (i.e. , as Seifert automorphisms) are characterized and the actions are described.
THE NIELSEN THEOREM FOR SEIFERT FIBERED SPACES OVER LOCALLY SYMMETRIC SPACES
RAYMOND, FRANK Korean Mathematical Society 1979 대한수학회지 Vol.16 No.1
In this note the geometric realization of a finite group of homotopy classes of self homotopy equivalences by a finite group of diffeomorphisms is investigated. In order for this to be accomplished an algebraic condition, which guarantees a certain group extension exists, must be satisfied. It is shown for a geometrically interesting class of aspherical manifolds, called injective Seifert fiber spaces over a locally symmetric space, that this necessary algebraic condition is also sufficient for geometric realization.
Trevor Simcox,Derek Antoku,Nickul Jain,Frank Acosta,Raymond Hah 대한척추외과학회 2019 Asian Spine Journal Vol.13 No.5
This comprehensive narrative literature review aims to extract studies related to frailty indices and their use in elective spine procedures, as limited studies regarding frailty exist in the spine literature. Most studies are retrospective analyses of prospectively collected databases. Evidence suggests a positive correlation between frailty level and mortality rate, postoperative complication rate, length of stay, and the possibility of discharge to a skilled nursing facility; these correlations have been illustrated across various spine procedures. The leading index is the modified frailty index, which measures 11 deficits. The development of more comprehensive frailty indices, such as the Adult Spinal Deformity Frailty Index, are promising and have high predictive value regarding postoperative complication rate in patients with spinal deformity. However, a frailty index that combines clinical, radiographic, and laboratory measures awaits development. Perhaps, the use of a frailty index in preoperative risk stratification for elective spine procedures could serve multiple purposes, including screening for high-risk patients, enhancement of operative decision making, approximation of complication rate for informed decision making, and refinement of perioperative care. Further prospective studies are warranted to determine clinically meaningful interventions in frail individuals.
Clare C.W. Yu,Chun T. Au,Frank Y.F. Lee,Raymond C.H. So,John P.S. Wong,Gary Y.K. Mak,Eric P. Chien,Alison M. McManus 한국산업안전공단 산업안전보건연구원 2015 Safety and health at work Vol.6 No.3
Background: Overweight, obesity, and cardiovascular disease risk factors are prevalent among firefighters in some developed countries. It is unclear whether physical activity and cardiopulmonary fitness reduce cardiovascular disease risk and the cardiovascular workload at work in firefighters. The present study investigated the relationship between leisure-time physical activity, cardiopulmonary fitness, cardiovascular disease risk factors, and cardiovascular workload at work in firefighters in Hong Kong. Methods: Male firefighters (n ¼ 387) were randomly selected from serving firefighters in Hong Kong (n ¼ 5,370) for the assessment of cardiovascular disease risk factors (obesity, hypertension, diabetes mellitus, dyslipidemia, smoking, known cardiovascular diseases). One-third (Target Group) were randomly selected for the assessment of off-duty leisure-time physical activity using the short version of the International Physical Activity Questionnaire. Maximal oxygen uptake was assessed, as well as cardiovascular workload using heart rate monitoring for each firefighter for four “normal” 24-hour working shifts and during real-situation simulated scenarios. Results: Overall, 33.9% of the firefighters had at least two cardiovascular disease risk factors. In the Target Group, firefighters who had higher leisure-time physical activity had a lower resting heart rate and a lower average working heart rate, and spent a smaller proportion of time working at a moderateintensity cardiovascular workload. Firefighters who had moderate aerobic fitness and high leisuretime physical activity had a lower peak working heart rate during the mountain rescue scenario compared with firefighters who had low leisure-time physical activities. Conclusion: Leisure-time physical activity conferred significant benefits during job tasks of moderate cardiovascular workload in firefighters in Hong Kong.
SEIFERT MANIFOLDS WITH FIBER SPHERICAL SPACE FORMS
LEE, JONG BUM,LEE, KYUNG BAI,RAYMOND, FRANK 경북대학교 위상수학 기하학연구센터 1995 硏究論文集 Vol.1 No.-
We study the Seifert fiber spaces modeled on the product space S^(3)+??^(2). Such spaces are “fiber bundles” with singularities. The regular fibers are spherical space-forms of S^(3), while singular fibers are finite quotients of regular fibers. For each of possible space-form groups Δ of S^(3), we obtain a criterion for a group extension Π of Δ to act on S^(3)×??^(2) as weakly S^(3)-equivariant maps, which gives rise to a Seifert fiber space modeled on S^(3)×??^(2) with weakly S^(3)-equivariant maps TOP s^(3)(S^(3)×??^(2)) as the universal group. In the course of proving our main results, we also obtain an explicit formula for H^(2)(Q;Z) for a cocompact crystallographic or Fuchsian group Q. Most of our methods for S^(3) apply to compact Lie groups with discrete center, and we state some of our results in this general context.
Yu, Clare C.W.,Au, Chun T.,Lee, Frank Y.F.,So, Raymond C.H.,Wong, John P.S.,Mak, Gary Y.K.,Chien, Eric P.,McManus, Alison M. Occupational Safety and Health Research Institute 2015 Safety and health at work Vol.6 No.3
Background: Overweight, obesity, and cardiovascular disease risk factors are prevalent among firefighters in some developed countries. It is unclear whether physical activity and cardiopulmonary fitness reduce cardiovascular disease risk and the cardiovascular workload at work in firefighters. The present study investigated the relationship between leisure-time physical activity, cardiopulmonary fitness, cardiovascular disease risk factors, and cardiovascular workload at work in firefighters in Hong Kong. Methods: Male firefighters (n = 387) were randomly selected from serving firefighters in Hong Kong (n = 5,370) for the assessment of cardiovascular disease risk factors (obesity, hypertension, diabetes mellitus, dyslipidemia, smoking, known cardiovascular diseases). One-third (Target Group) were randomly selected for the assessment of off-duty leisure-time physical activity using the short version of the International Physical Activity Questionnaire. Maximal oxygen uptake was assessed, as well as cardiovascular workload using heart rate monitoring for each firefighter for four "normal" 24-hour working shifts and during real-situation simulated scenarios. Results: Overall, 33.9% of the firefighters had at least two cardiovascular disease risk factors. In the Target Group, firefighters who had higher leisure-time physical activity had a lower resting heart rate and a lower average working heart rate, and spent a smaller proportion of time working at a moderate-intensity cardiovascular workload. Firefighters who had moderate aerobic fitness and high leisure-time physical activity had a lower peak working heart rate during the mountain rescue scenario compared with firefighters who had low leisure-time physical activities. Conclusion: Leisure-time physical activity conferred significant benefits during job tasks of moderate cardiovascular workload in firefighters in Hong Kong.
Michael A. Stone,Andre M. Jakoi,Justin A. Iorio,Martin H. Pham,Neil N. Patel,Patrick C. Hsieh,John C. Liu,Frank L. Acosta,Raymond Hah,Jeffrey C. Wang 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.3
There has been a conscious effort to address osteoporosis in the aging population. As bisphosphonate and intermittent parathyroid hormone (PTH) therapy become more widely prescribed to treat osteoporosis, it is important to understand their effects on other physiologic processes, particularly the impact on spinal fusion. Despite early animal model studies and more recent clinical studies, the impact of these medications on spinal fusion is not fully understood. Previous animal studies suggest that bisphosphonate therapy resulted in inhibition of fusion mass with impeded maturity and an unknown effect on biomechanical strength. Prior animal studies demonstrate an improved fusion rate and fusion mass microstructure with the use of intermittent PTH. The purpose of this study was to determine if bisphosphonates and intermittent PTH treatment have impact on human spinal fusion. A systematic review of the literature published between 1980 and 2015 was conducted using major electronic databases. Studies reporting outcomes of human subjects undergoing 1, 2, or 3-level spinal fusion while receiving bisphosphonates and/or intermittent PTH treatment were included. The results of relevant human studies were analyzed for consensus on the effects of these medications in regards to spinal fusion. There were nine human studies evaluating the impact of these medications on spinal fusion. Improved fusion rates were noted in patients receiving bisphosphonates compared to control groups, and greater fusion rates in patients receiving PTH compared to control groups. Prior studies involving animal models found an improved fusion rate and fusion mass microstructure with the use of intermittent PTH. No significant complications were demonstrated in any study included in the analysis. Bisphosphonate use in humans may not be a deterrent to spinal fusion. Intermittent parathyroid use has shown early promise to increase fusion mass in both animal and human studies but further studies are needed to support routine use.