1. A variable damping force damper, comprising:
a hollow cylinder having hydraulic oil sealed therein;
a columnar piston configured to reciprocate in the cylinder and separate an interior of the cylinder into a first oil chamber and a second oil chamber; and
a piston rod having the piston at an end thereof,
wherein the piston comprises:
an inner yoke made of a ferromagnetic material, the inner yoke being secured to the piston rod and having an outer peripheral surface coaxial with the cylinder;
an outer yoke made of a ferromagnetic material, the outer yoke having an inner peripheral surface coaxial with the outer peripheral surface of the inner yoke and opposing the outer peripheral surface of the inner yoke via a predetermined gap;
an electromagnetic coil disposed in the gap;
a first communication oil passage in communication with the first oil chamber and having an opening in an axial end surface of the piston on a side of the second oil chamber;
a valve plate configured to have elasticity and close the opening of the first communication oil passage, the valve plate being made of a ferromagnetic material and attracted in a closing direction by a magnetic force of the electromagnetic coil;
a pressure accumulation housing secured to the axial end surface of the piston on the side of the second oil chamber and defining a pressure accumulation chamber on a side of the
valve plate opposite to the opening;
a second communication oil passage connecting the pressure accumulation chamber and the second oil chamber with each other;
and wherein the pressure accumulation housing is fastened to the inner yoke by a fastening member, and at least a part of the second communication oil passage is formed in the fastening member on an axis of the fastening member.
2. The variable damping force damper according to claim 1, wherein the valve plate is configured to cover substantially an entirety of the axial end surface on the side of the second oil chamber.
3. The variable damping force damper according to claim 2, wherein the valve plate is provided with a flow rate adjustment hole forming a part of the second communication oil passage.
4. The variable damping force damper according to claim 1, wherein a second valve plate is provided on a side of the first oil chamber, and further, third and fourth communication oil passages, a second pressure accumulation housing and a second pressure accumulation housing are provided in correspondence with the second valve plate provided on the side of the first oil chamber, wherein:
the third communication oil passage is in communication with the second oil chamber and has an opening in an axial end surface of the piston on a side of the first oil chamber;
the second valve plate provided on the side of the first oil chamber is configured to have elasticity and close the opening of the third communication oil passage, the second valve plate being made of a ferromagnetic material and attracted in a closing direction by the magnetic force of the electromagnetic coil;
the second pressure accumulation housing is secured to the axial end surface of the piston on the side of the first oil chamber and defines a second pressure accumulation chamber on a side of the second valve plate opposite to the opening of the third communication oil passage; and
the fourth communication oil passage connects the second pressure accumulation chamber and the first oil chamber with each other.
5. The variable damping force damper according to claim 1, wherein:
a predetermined gap is defined between an inner peripheral surface of the cylinder and an outer peripheral surface of the piston; and
the second communication oil passage opens out in the gap.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. Method for managing information propagation in a network comprising a plurality of node devices among which a receiving node device is able to receive information from a source node device, said information being propagated from the source node device to the receiving node device through a path of the network, said path comprising at least one edge of the network directly linking a first relaying node device and a second relaying node device, wherein the method comprises allocating to the second relaying node device a score each time that the receiving node device receives a useful content from the source node device through said path, wherein the first relaying node device is able to receive information from the second relaying node device at a given rate, and in that the method further comprises periodically updating said rate as a function of a sum of the scores allocated to the second relaying node device.
2. Method of claim 1, wherein the first relaying node device has a plurality of neighboring node devices directly linked to said first relaying node device through the network and the sum of the rates at which the first relaying node device is able to receive information from each neighboring node device is equal to a constant total rate.
3. Method of claim 1, wherein the step of allocating is implemented by the receiving node device which rewards by itself the score to the second relaying node device of the path.
4. Method of claim 1, wherein the step of allocating is implemented by the first relaying node device.
5. Management device for managing information propagation in a network comprising a plurality of node devices among which a receiving node device is able to receive information from a source node device, said information being propagated from the source node device to the receiving node device through a path of the network, said path comprising at least one edge of the network directly linking a first relaying node device and a second relaying node device, wherein the management device comprises an allocation module for allocating to the second relaying node device a score each time that the receiving node device receives a useful content from the source node device through said path, wherein the first relaying node device is able to receive information from the second relaying node device at a given rate, and in that the management device further comprises an updating module for periodically updating said rate as a function of a sum of the scores rewarded to the second relaying node device.
6. Node device of a network comprising the management device of claim 5.
7. A computer-readable program comprising computer-executable instructions to enable a computer to perform the method of claim 1.