This study was conducted to evaluate the performance of six stem taper models on four tropical tree species, namely Celtis luzonica(Magabuyo),Diplodiscus paniculatus(Balobo), Parashorea malaanonan(Bagtikan), and Swiet...This study was conducted to evaluate the performance of six stem taper models on four tropical tree species, namely Celtis luzonica(Magabuyo),Diplodiscus paniculatus(Balobo), Parashorea malaanonan(Bagtikan), and Swietenia macrophylla(Mahogany) in Mount Makiling Forest Reserve(MMFR), Philippines using fit statistics and lack-of-fit statistics. Four statistical criteria were used in this study, including the standard error of estimate(SEE),coefficient of determination(R^2), mean bias( E),and absolute mean difference(AMD). For the lack-offit statistics, SEE, E and AMD were determined in different relative height classes. The results indicated that the Kozak02 stem taper model offered the best fit for the four tropical species in most statistics. The Kozak02 model also consistently provided the best performance in the lack-of-fit statistics with the best SEE, E and AMD in most of the relative height classes. These stem taper equations could help forest managers and researchers better estimate the diameter of the outside bark with any given height,merchantable stem volumes and total stem volumes of standing trees belonging to the four species of thetropical forest in MMFR.展开更多
This article first introduces the current research status of space optical communication,and gives a brief overview of the development and application prospects of space optical communication,explaining its important ...This article first introduces the current research status of space optical communication,and gives a brief overview of the development and application prospects of space optical communication,explaining its important research significance.Then,the working principle of ATP in space optical communication system is studied,the mathematical model of ATP control system is established according to the actual needs,and the ATP control system design of space optical communication is designed.By selecting appropriate motors and gyroscopes as the actuators and detection elements of the system,substituting the actual parameters for simulation analysis,and correcting and verifying the results,some useful results are obtained.The simulation results show the rationality and effectiveness of the ATP design scheme.展开更多
基金support from Kongju National University Research Grant (2014)
文摘This study was conducted to evaluate the performance of six stem taper models on four tropical tree species, namely Celtis luzonica(Magabuyo),Diplodiscus paniculatus(Balobo), Parashorea malaanonan(Bagtikan), and Swietenia macrophylla(Mahogany) in Mount Makiling Forest Reserve(MMFR), Philippines using fit statistics and lack-of-fit statistics. Four statistical criteria were used in this study, including the standard error of estimate(SEE),coefficient of determination(R^2), mean bias( E),and absolute mean difference(AMD). For the lack-offit statistics, SEE, E and AMD were determined in different relative height classes. The results indicated that the Kozak02 stem taper model offered the best fit for the four tropical species in most statistics. The Kozak02 model also consistently provided the best performance in the lack-of-fit statistics with the best SEE, E and AMD in most of the relative height classes. These stem taper equations could help forest managers and researchers better estimate the diameter of the outside bark with any given height,merchantable stem volumes and total stem volumes of standing trees belonging to the four species of thetropical forest in MMFR.
文摘This article first introduces the current research status of space optical communication,and gives a brief overview of the development and application prospects of space optical communication,explaining its important research significance.Then,the working principle of ATP in space optical communication system is studied,the mathematical model of ATP control system is established according to the actual needs,and the ATP control system design of space optical communication is designed.By selecting appropriate motors and gyroscopes as the actuators and detection elements of the system,substituting the actual parameters for simulation analysis,and correcting and verifying the results,some useful results are obtained.The simulation results show the rationality and effectiveness of the ATP design scheme.
