Domingo S. Liotta discovered Assisted Circulation at the Department of Surgery of Baylor College of Medicine in Houston in 1961 and opened up a new medical therapy: Prolonged mechanical Cardiocirculatory Assistance (L...Domingo S. Liotta discovered Assisted Circulation at the Department of Surgery of Baylor College of Medicine in Houston in 1961 and opened up a new medical therapy: Prolonged mechanical Cardiocirculatory Assistance (LVASs) for the treatment of Refractory and Irreversible Heart Failure. The American Society of Cardiology selected Liotta’s work for the “Young Investigator Award” granted in Denver in May 1962: ”This prolonged left ventricular bypass decompresses the left ventricle, reduces left ventricular work, decreases left ventricular wall tension and increases coronary circulation” (D. Liotta, D. A. Cooley, M. E. DeBakey et al. Prolonged assisted circulation during and after cardiac or aortic surgery: prolonged partial left ventricular bypass by means of intracorporeal circulation (Am J Cardiol 1963;12: 399-405). Indeed, there is a lucky occurrence in science;I had the good luck to start this research at a moment when initially unrelated developments were actively taking place in cardiac surgery, long before any rigor or fine statistics were produced. The first observation was to recognize an interaction between the overstretched myocardial fibers and the result of cardiac assistance causing their shortening within the normal values when the excess of blood volume retained in the heart chamber was unloaded, and the second one was that the oxygen consumption of the heart (a measurement of its energy use) decreases during Cardiac Assistance. With the collaboration of Michael E. DeBakey, Liotta started the clinical experience of Cardiocirculatory Assistance and on August 6 1966 they succeeded in the first survival of a patient in postcardiotomy cardiogenic shock. Today, after 50 years, LVASs are in force in the medical practice worldwide and contrarily to transplantation practices, they have an unlimited future;they are continuously fed back by the scientific advances of general technologies. On April 4 1969 Cooley and Liotta implanted the first clinical Total Artificial Heart (TAH) as a bridge to heart transplantation. So far, this has been the case of TAH use in which the patient could be extubated and weaned off the ventilator the following morning. This is a sort of historical document. The venerable visit of Mike DeBakey to Argentina in 1996 was evidence of his majestic peace harmonized in the memory and veracity of useful years.展开更多
Some numerical tests are finished in this paper for raising the ability to find solutions of Denton-scheme. First, three improvement opinions of concrete algorithm for Denton-Scheme are presented. Then, the computatio...Some numerical tests are finished in this paper for raising the ability to find solutions of Denton-scheme. First, three improvement opinions of concrete algorithm for Denton-Scheme are presented. Then, the computational accuracy of numerical solutions is checked with three typical examples, also a quantitative estimation for computational accuracy is described. Finally, the maximum flux of mass through plane cascades is determined by numerical tests. A lot of tests shows that the ability to find solutions of this program is fairly raised with algorithm improvements of this paper.展开更多
In this paper,the author introduces and analyzes the benchmarking methods of quarterly GDP and annual GDP that are used in China and the other countries.Based on the analysis of all kinds of benchmarking methods,the a...In this paper,the author introduces and analyzes the benchmarking methods of quarterly GDP and annual GDP that are used in China and the other countries.Based on the analysis of all kinds of benchmarking methods,the author suggests that Chinese statistical department should use the enhanced proportional Denton method to benchmark quarterly GDP and annual GDP.展开更多
Official monthly U.S.labour force estimation at the sub-State level(mostly counties)is based on what is known as the‘Handbook’(HB)method,one of the earliest uses of administrative data for small area estimation.The ...Official monthly U.S.labour force estimation at the sub-State level(mostly counties)is based on what is known as the‘Handbook’(HB)method,one of the earliest uses of administrative data for small area estimation.The administrative data,however,are poor in coverage and have conceptual deficiencies.Past attempts to correct for the resulting bias of the HB estimates by informal(implicit)modelling have not been successful,due to the absence of regular direct monthly survey estimates at the sub-State level.Benchmarking the sub-State HB estimates each month to the State model dependent estimates helps to correct for an overall bias,but not in individual areas.In this article we propose benchmarking additionally to the annual model-dependent area estimates.The annual models include known administrative data as covariates,and are used to define corresponding monthly sub-State models,which in turn enable producing monthly synthetic estimates as possible substitutes for the HB estimates in real time production.Variance estimates,which account for sampling errors and the errors of the model dependent estimators are developed.Data for sub-State areas in the State of Arizona are used for illustration.Although the methodology developed in this article stems from a particular(but very important)application,it is general and applicable to other similar problems.展开更多
文摘Domingo S. Liotta discovered Assisted Circulation at the Department of Surgery of Baylor College of Medicine in Houston in 1961 and opened up a new medical therapy: Prolonged mechanical Cardiocirculatory Assistance (LVASs) for the treatment of Refractory and Irreversible Heart Failure. The American Society of Cardiology selected Liotta’s work for the “Young Investigator Award” granted in Denver in May 1962: ”This prolonged left ventricular bypass decompresses the left ventricle, reduces left ventricular work, decreases left ventricular wall tension and increases coronary circulation” (D. Liotta, D. A. Cooley, M. E. DeBakey et al. Prolonged assisted circulation during and after cardiac or aortic surgery: prolonged partial left ventricular bypass by means of intracorporeal circulation (Am J Cardiol 1963;12: 399-405). Indeed, there is a lucky occurrence in science;I had the good luck to start this research at a moment when initially unrelated developments were actively taking place in cardiac surgery, long before any rigor or fine statistics were produced. The first observation was to recognize an interaction between the overstretched myocardial fibers and the result of cardiac assistance causing their shortening within the normal values when the excess of blood volume retained in the heart chamber was unloaded, and the second one was that the oxygen consumption of the heart (a measurement of its energy use) decreases during Cardiac Assistance. With the collaboration of Michael E. DeBakey, Liotta started the clinical experience of Cardiocirculatory Assistance and on August 6 1966 they succeeded in the first survival of a patient in postcardiotomy cardiogenic shock. Today, after 50 years, LVASs are in force in the medical practice worldwide and contrarily to transplantation practices, they have an unlimited future;they are continuously fed back by the scientific advances of general technologies. On April 4 1969 Cooley and Liotta implanted the first clinical Total Artificial Heart (TAH) as a bridge to heart transplantation. So far, this has been the case of TAH use in which the patient could be extubated and weaned off the ventilator the following morning. This is a sort of historical document. The venerable visit of Mike DeBakey to Argentina in 1996 was evidence of his majestic peace harmonized in the memory and veracity of useful years.
文摘Some numerical tests are finished in this paper for raising the ability to find solutions of Denton-scheme. First, three improvement opinions of concrete algorithm for Denton-Scheme are presented. Then, the computational accuracy of numerical solutions is checked with three typical examples, also a quantitative estimation for computational accuracy is described. Finally, the maximum flux of mass through plane cascades is determined by numerical tests. A lot of tests shows that the ability to find solutions of this program is fairly raised with algorithm improvements of this paper.
文摘In this paper,the author introduces and analyzes the benchmarking methods of quarterly GDP and annual GDP that are used in China and the other countries.Based on the analysis of all kinds of benchmarking methods,the author suggests that Chinese statistical department should use the enhanced proportional Denton method to benchmark quarterly GDP and annual GDP.
文摘Official monthly U.S.labour force estimation at the sub-State level(mostly counties)is based on what is known as the‘Handbook’(HB)method,one of the earliest uses of administrative data for small area estimation.The administrative data,however,are poor in coverage and have conceptual deficiencies.Past attempts to correct for the resulting bias of the HB estimates by informal(implicit)modelling have not been successful,due to the absence of regular direct monthly survey estimates at the sub-State level.Benchmarking the sub-State HB estimates each month to the State model dependent estimates helps to correct for an overall bias,but not in individual areas.In this article we propose benchmarking additionally to the annual model-dependent area estimates.The annual models include known administrative data as covariates,and are used to define corresponding monthly sub-State models,which in turn enable producing monthly synthetic estimates as possible substitutes for the HB estimates in real time production.Variance estimates,which account for sampling errors and the errors of the model dependent estimators are developed.Data for sub-State areas in the State of Arizona are used for illustration.Although the methodology developed in this article stems from a particular(but very important)application,it is general and applicable to other similar problems.
