Memory analysis gains a weight in the area of computer live forensics.How to get network connection information is one of the challenges in memory analysis and plays an important role in identifying sources of malicio...Memory analysis gains a weight in the area of computer live forensics.How to get network connection information is one of the challenges in memory analysis and plays an important role in identifying sources of malicious cyber attack. It is more difficult to fred the drivers and get network connections information from a 64-bit windows 7 memory image file than from a 32-bit operating system memory image f＇de. In this paper, an approach to fred drivers and get network connection information from 64-bit windows 7 memory images is given. The method is verified on 64-bit windows 7 version 6.1.7600 and proved reliable and efficient.展开更多
Electron microscopic observations revealed that the tissues of poplar ( Populus deltoides Bartr. ex Marsh) apical bud cells, which were fixed by a modified procedure of potassium permanganate fixative, showed a di...Electron microscopic observations revealed that the tissues of poplar ( Populus deltoides Bartr. ex Marsh) apical bud cells, which were fixed by a modified procedure of potassium permanganate fixative, showed a distinct endomembrane organization, in particular, the structural associations of the endoplasmic reticulum (ER) with other membrane systems. The striking findings are that some ER elements were in connection with the nuclear envelopes of two adjacent cells through plasmodesmata, and many ER elements were also associated with mitochondria, plastids, Golgi bodies or the plasma membrane (PM), forming a bridge_like continuum among various endomembrane systems or between nucleus to nucleus. A great number of plasmodesmata existed between cells, indicating a perfectly integrated symplasmic structure in poplar apical bud meristem grown in a long day environment. During the short day_induced dormancy, ER contracted, leading to its disassociation between nuclei, and between the nucleus and organelles/plasmalemma in many cells. After dormancy broke and shoots growth resumed, contracted ER was no longer observed in the apical bud cells. The ER associations with other endomembrane systems and the intercellular communication channels were re_established similar to that of plants before dormancy induction. These observations suggest that ER may play an important role in linking_up between the nucleus and organelles, and between the nucleus and the nucleus (or cell_to_cell), and seemingly coordinating various physiological processes by the bridging_like associations. And the contraction of ER under short_day may result in the growth cessation and the development of dormancy in poplar.展开更多
The rapid development of electronic businesses raises the need for exchanging information between enterprise networks via internet. Ira secure connection is necessary then a virtual private network（VPN） is essential...The rapid development of electronic businesses raises the need for exchanging information between enterprise networks via internet. Ira secure connection is necessary then a virtual private network（VPN） is essential. IPSec use encrypting and encapsulating technology in client device and establishes a secure tunnel connection. The private network built by IPSec technology can ensure good transmission performance and service quality over public networks. This paper analyses the architecture of IPSec and describes the process of creating a site- to-site IPSec VPN between header and branch of enterprise over internet. In addition, this study analyses the encryption at the boundary of the network and concludes a propose some practical problems need to consider inside enterprise network.展开更多
The quantity of installed PV （photovoltaic） systems in the German distribution grid is still increasing. In some areas, the installed PV capacity exceeds 5 kW per HC （house connection）. Therefore, the load flow ch...The quantity of installed PV （photovoltaic） systems in the German distribution grid is still increasing. In some areas, the installed PV capacity exceeds 5 kW per HC （house connection）. Therefore, the load flow changes its characteristics and leads to new requirements for the grid. In some areas, the power feedback is higher than the delivery and the installed PV capacity becomes the decisive factor for grid planning. This paper discusses the impact of PV systems on the flicker level. The focus hereby is on the correlation among the flicker level, the grid voltage and the meteorological parameters. Different approaches to investigate if there is an influence of PV systems on the maximum flicker are taken into account. Furthermore, an investigation if the normative limit is exceeded will be shown.展开更多
A method to extract information of network connection status information from physical memory on Windows Vista operating system is proposed. Using this method, a forensic examiner can extract accurately the informatio...A method to extract information of network connection status information from physical memory on Windows Vista operating system is proposed. Using this method, a forensic examiner can extract accurately the information of current TCP/ IP network connection information, including IDs of processes which established connections, establishing time, local address, local port, remote address, remote port, etc., from a physical memory on Windows Xflsta operating system. This method is reliable and efficient. It is verified on Windows Vista, Windows Vista SP1, Windows Vista SP2.展开更多
基金This work is supported by the National Natural Science Foundation of China（61070163） and Shandong Natural Science Foundation （Y2008G35）.
文摘Memory analysis gains a weight in the area of computer live forensics.How to get network connection information is one of the challenges in memory analysis and plays an important role in identifying sources of malicious cyber attack. It is more difficult to fred the drivers and get network connections information from a 64-bit windows 7 memory image file than from a 32-bit operating system memory image f＇de. In this paper, an approach to fred drivers and get network connection information from 64-bit windows 7 memory images is given. The method is verified on 64-bit windows 7 version 6.1.7600 and proved reliable and efficient.
文摘Electron microscopic observations revealed that the tissues of poplar ( Populus deltoides Bartr. ex Marsh) apical bud cells, which were fixed by a modified procedure of potassium permanganate fixative, showed a distinct endomembrane organization, in particular, the structural associations of the endoplasmic reticulum (ER) with other membrane systems. The striking findings are that some ER elements were in connection with the nuclear envelopes of two adjacent cells through plasmodesmata, and many ER elements were also associated with mitochondria, plastids, Golgi bodies or the plasma membrane (PM), forming a bridge_like continuum among various endomembrane systems or between nucleus to nucleus. A great number of plasmodesmata existed between cells, indicating a perfectly integrated symplasmic structure in poplar apical bud meristem grown in a long day environment. During the short day_induced dormancy, ER contracted, leading to its disassociation between nuclei, and between the nucleus and organelles/plasmalemma in many cells. After dormancy broke and shoots growth resumed, contracted ER was no longer observed in the apical bud cells. The ER associations with other endomembrane systems and the intercellular communication channels were re_established similar to that of plants before dormancy induction. These observations suggest that ER may play an important role in linking_up between the nucleus and organelles, and between the nucleus and the nucleus (or cell_to_cell), and seemingly coordinating various physiological processes by the bridging_like associations. And the contraction of ER under short_day may result in the growth cessation and the development of dormancy in poplar.
文摘The rapid development of electronic businesses raises the need for exchanging information between enterprise networks via internet. Ira secure connection is necessary then a virtual private network（VPN） is essential. IPSec use encrypting and encapsulating technology in client device and establishes a secure tunnel connection. The private network built by IPSec technology can ensure good transmission performance and service quality over public networks. This paper analyses the architecture of IPSec and describes the process of creating a site- to-site IPSec VPN between header and branch of enterprise over internet. In addition, this study analyses the encryption at the boundary of the network and concludes a propose some practical problems need to consider inside enterprise network.
文摘The quantity of installed PV （photovoltaic） systems in the German distribution grid is still increasing. In some areas, the installed PV capacity exceeds 5 kW per HC （house connection）. Therefore, the load flow changes its characteristics and leads to new requirements for the grid. In some areas, the power feedback is higher than the delivery and the installed PV capacity becomes the decisive factor for grid planning. This paper discusses the impact of PV systems on the flicker level. The focus hereby is on the correlation among the flicker level, the grid voltage and the meteorological parameters. Different approaches to investigate if there is an influence of PV systems on the maximum flicker are taken into account. Furthermore, an investigation if the normative limit is exceeded will be shown.
基金This work is supported by the National Natural Science Foundation of China （61070163） and Shandong Natural Science Foundation （Y2008G35）.
文摘A method to extract information of network connection status information from physical memory on Windows Vista operating system is proposed. Using this method, a forensic examiner can extract accurately the information of current TCP/ IP network connection information, including IDs of processes which established connections, establishing time, local address, local port, remote address, remote port, etc., from a physical memory on Windows Xflsta operating system. This method is reliable and efficient. It is verified on Windows Vista, Windows Vista SP1, Windows Vista SP2.
