Automatic target recognition （ATR） is an important issue for military applications, the topic of the ATR system belongs to the field of pattern recognition and classification. In the paper, we present an approach fo...Automatic target recognition （ATR） is an important issue for military applications, the topic of the ATR system belongs to the field of pattern recognition and classification. In the paper, we present an approach for building an ATR system with improved artificial neural network to recog- nize and classify the typical targets in the battle field. The invariant features of Hu invariant moments and roundness were selected to be the inputs of the neural network because they have the invari- ances of rotation, translation and scaling. The pictures of the targets are generated by the 3-D mod- els to improve the recognition rate because it is necessary to provide enough pictures for training the artificial neural network. The simulations prove that the approach can be implement ed in the ATR system and it has a high recognition rate and can be applied in real time.展开更多
The toxic effects of tributyltin（TBT） have been extensively documented in several types of cells, but the molecular mechanisms related to the genotoxic effects of TBT have still not been fully elucidated. Our study ...The toxic effects of tributyltin（TBT） have been extensively documented in several types of cells, but the molecular mechanisms related to the genotoxic effects of TBT have still not been fully elucidated. Our study showed that exposure of human hepatoma G2 cells to 1–4 μmol/L TBT for 3 hr caused severe DNA damage in a concentration-dependent manner. Moreover, the expression levels of key DNA damage sensor genes such as the replication factor C, proliferating cell nuclear antigen and poly（ADP-ribose）polymerase-1 were inhabited in a concentration-dependent manner. We further demonstrated that TBT induced cell apoptosis via the p53-mediated pathway, which was most likely activated by the ataxia telangiectasia mutated and rad-3 related（ATR）protein kinase. The results also showed that cytochrome c, caspase-3, caspase-8,caspase-9, and the B-cell lymphoma 2 were involved in this process. Taken together, we demonstrated for the first time that the inhibition of the DNA repair system might be more responsible for TBT-induced genotoxic effects in cells. Then the generated DNA damage induced by TBT initiated ATR-p53-mediated apoptosis.展开更多
随着全球人口老龄化进程的推进,前列腺癌的发病率和死亡率逐年上升,已引起了社会各界的广泛关注。基于合成致死策略,美国食品药品监督管理局(Food and Drug Administration, FDA)近年来已相继批准了多项多聚腺苷二磷酸核糖聚合酶(poly A...随着全球人口老龄化进程的推进,前列腺癌的发病率和死亡率逐年上升,已引起了社会各界的广泛关注。基于合成致死策略,美国食品药品监督管理局(Food and Drug Administration, FDA)近年来已相继批准了多项多聚腺苷二磷酸核糖聚合酶(poly ADP-ribose polymerase, PARP)抑制剂,用于转移性去势抵抗性前列腺癌(metastatic castration-resistant prostate cancer,mCRPC)的治疗。这一进展极大地激发了学者们对新型合成致死组合——共济失调毛细血管扩张突变(ataxia telangiectasia-mutated, ATM)基因/共济失调毛细血管扩张和Rad3相关激酶(ataxia telangiectasia and Rad3-related protein,ATR)的研究兴趣。在DNA损伤修复通路中,ATM激酶主要参与DNA双链断裂的修复,而激酶ATR则在DNA单链断裂的修复过程中发挥重要作用,并起到积极的调控作用。ATR抑制剂被认为是继PARP抑制剂之后,最具前景的合成致死靶向药物之一,有望成为ATM基因突变患者的潜在新型治疗药物。然而,目前关于ATR抑制剂在前列腺癌治疗领域的临床研究数据尚显不足。因此,深入理解ATM/ATR激酶组合的合成致死机制,对于推进前列腺癌的精准治疗具有至关重要的意义。展开更多
分析初中英语阅读教学瓶颈。阐述图式理论与ATR学习模式的内涵,并优化基于图式理论的ATR学习模式,即通过激活、积累、调试、重建、延展教学活动设计,实现知识结构化学习与迁移运用,最终实现知识、能力、素养的螺旋提升。以人教版初中《...分析初中英语阅读教学瓶颈。阐述图式理论与ATR学习模式的内涵,并优化基于图式理论的ATR学习模式,即通过激活、积累、调试、重建、延展教学活动设计,实现知识结构化学习与迁移运用,最终实现知识、能力、素养的螺旋提升。以人教版初中《英语》八年级(下)Unit 7 What is the highest mountain in the world? Section A 3a—3c为例,围绕语篇Qomolangma—the most Dangerous mountain in the world探究ATR学习模式促进学生阅读的途径。展开更多
A systematically analytical method for the recongnition of blue ballpoint pen ink has been studied by ATR technique of Fourier transform infrared(FTIR) spectrometry. By using this method, a total of 108 blue ink sampl...A systematically analytical method for the recongnition of blue ballpoint pen ink has been studied by ATR technique of Fourier transform infrared(FTIR) spectrometry. By using this method, a total of 108 blue ink samples have been divided to 18 groups depending on the main component. The spectral characteristics of these inks such as peak location, peak intensity etc. were described by the way of pattern recognition; and the species of inks have been able to be recognized by their correlation coefficient(λ). This system has provided a best reliable and nondestructive method for the determination of ballpoint pen ink.展开更多
基金Supported by the Ministerial Level Advanced Research Foundation(9140A01010411BQ01)the National Twelfth Five-Year Project(40405050303)
文摘Automatic target recognition （ATR） is an important issue for military applications, the topic of the ATR system belongs to the field of pattern recognition and classification. In the paper, we present an approach for building an ATR system with improved artificial neural network to recog- nize and classify the typical targets in the battle field. The invariant features of Hu invariant moments and roundness were selected to be the inputs of the neural network because they have the invari- ances of rotation, translation and scaling. The pictures of the targets are generated by the 3-D mod- els to improve the recognition rate because it is necessary to provide enough pictures for training the artificial neural network. The simulations prove that the approach can be implement ed in the ATR system and it has a high recognition rate and can be applied in real time.
基金supported by the National Natural Science Foundation of China (No. 40606027)the Project of the Xiamen Science and Technology Program (No. 2013Z20134027)
文摘The toxic effects of tributyltin（TBT） have been extensively documented in several types of cells, but the molecular mechanisms related to the genotoxic effects of TBT have still not been fully elucidated. Our study showed that exposure of human hepatoma G2 cells to 1–4 μmol/L TBT for 3 hr caused severe DNA damage in a concentration-dependent manner. Moreover, the expression levels of key DNA damage sensor genes such as the replication factor C, proliferating cell nuclear antigen and poly（ADP-ribose）polymerase-1 were inhabited in a concentration-dependent manner. We further demonstrated that TBT induced cell apoptosis via the p53-mediated pathway, which was most likely activated by the ataxia telangiectasia mutated and rad-3 related（ATR）protein kinase. The results also showed that cytochrome c, caspase-3, caspase-8,caspase-9, and the B-cell lymphoma 2 were involved in this process. Taken together, we demonstrated for the first time that the inhibition of the DNA repair system might be more responsible for TBT-induced genotoxic effects in cells. Then the generated DNA damage induced by TBT initiated ATR-p53-mediated apoptosis.
文摘分析初中英语阅读教学瓶颈。阐述图式理论与ATR学习模式的内涵,并优化基于图式理论的ATR学习模式,即通过激活、积累、调试、重建、延展教学活动设计,实现知识结构化学习与迁移运用,最终实现知识、能力、素养的螺旋提升。以人教版初中《英语》八年级(下)Unit 7 What is the highest mountain in the world? Section A 3a—3c为例,围绕语篇Qomolangma—the most Dangerous mountain in the world探究ATR学习模式促进学生阅读的途径。
文摘A systematically analytical method for the recongnition of blue ballpoint pen ink has been studied by ATR technique of Fourier transform infrared(FTIR) spectrometry. By using this method, a total of 108 blue ink samples have been divided to 18 groups depending on the main component. The spectral characteristics of these inks such as peak location, peak intensity etc. were described by the way of pattern recognition; and the species of inks have been able to be recognized by their correlation coefficient(λ). This system has provided a best reliable and nondestructive method for the determination of ballpoint pen ink.
