Abstract: A system and method are provided for protecting data information stored in a storage medium. The system includes a memory unit which is divided into a plurality of storage regions in which data information is stored; a domain unit which includes a plurality of OS domains, which are access subjects, and loads the data information stored in the storage regions that are accessed by the OS domains; and a control unit which controls access of the domain unit to the memory unit.

Abstract: Provided is an apparatus and method for protecting a system in a virtualized environment. The apparatus includes a domain unit including a plurality of domains, each having one or more device drivers; a system resource unit forming hardware of the system; a direct memory access (DMA) driver; and a control unit including an access control module which controls the access of the domain unit to the system resource unit in the virtualized environment.

Abstract: Provided is a method of controlling memory access. In a system including a first layer element executed in a privileged mode having a first priority of permission to access the entire region of a memory and second and third layer elements executed in an unprivileged mode having a second priority of permission to access a partial region of the memory, the method of controlling memory access determines whether the memory is accessible for each page that is an address space unit, based on which mode a layer element currently accessing the memory is executed in between the privileged mode and the unprivileged mode; and determines whether the memory is accessible based on which one of the first, second and third layer elements corresponds to a domain currently being attempted to be accessed from among a plurality of domains of the memory.

Abstract: Provided are a method and a system for processing an access to a disk block. The system receives a disk block access request from an OS domain, determines whether the OS domain is permitted to access a disk block with reference to a predetermined block table and processes disk block access of the OS domain according to the determination result. Accordingly, OS domains can share caches without having data copy through memory access control in a virtual machine monitor environment. Furthermore, a device domain controls access to a disk drive so that data corruption can be prevented.

Abstract: An apparatus and method are provided for variably transmitting a multimedia stream according to requirements of a client device and the state of a channel. The multimedia stream transmission apparatus includes: a plurality of virtual machines corresponding to the multiple client applications, each of the virtual machines determining a specific parameter set and obtaining a change value for the parameter set from network statistics and a requirement of a corresponding client application; a parameter adjustment unit which adjusts values of parameters used in a network interface by the change value; and the network interface which transmits the multimedia stream based on the adjusted parameters.

Abstract: An apparatus and method for providing a security domain are provided. The apparatus includes a security domain which is not connected to an external system and which manages a digital rights management (DRM) license requiring security; a non-security domain which can be connected to the external system and which manages encrypted DRM content; and a virtual controller which controls the security domain and the non-security domain. The method includes requesting checking of a license for encrypted content; checking whether the license for encrypted content exists, in response to the requesting checking of the license; and if it is determined that the license exists, requesting transmission of encrypted content, decrypting the encrypted content, and playing the decrypted content.

Abstract: A method and apparatus for controlling parameters of a wireless data streaming system are provided. The method of controlling parameters of a wireless data streaming system includes controlling first parameters, which can be controlled in units of individual packets, according to a current packet transmission state in a data stream; transmitting a predefined number of packets using the first parameters and obtaining statistical information regarding use of the first parameters in the transmission of the predefined number of packets; and controlling second parameters, which can be controlled in units of packet groups, with reference to the statistical information and a desired quality of service (QoS).

Abstract: A data transmission method and apparatus encodes data to be transmitted over a wireless network on a unit basis, and provides the transmission data with information for allowing the transmission data to recover from an error being added thereto, transmits the transmission data to the wireless network, calculates a transfer success ratio depending on whether the transmission data have been successfully transmitted, and controls the transmission of the transmission data depending on whether the transfer success ratio is higher than a threshold value.

Abstract: A method of and apparatus for controlling power consumption in a wireless device that transmits and receives data to and from another wireless device based on a predetermined unit time, includes receiving at least one data frame from the other wireless device within the range of a maximum reception mode time, transmitting at least one data to the other wireless device at an adjusted transmission rate according to traffic requirements or status information of the portable wireless device, and switching a current mode of the portable wireless device to a doze mode for a remaining time of the unit time.

Abstract: An apparatus and method for transmitting a multimedia data stream are provided. The apparatus includes a data source unit to output the data stream; a frame dividing unit to divide the data stream according to a type of a video frame included in the data stream and to output the divided data stream; a parameter control unit to select a parameter set for separate transmission control of the divided data stream using parameters for controlling a transmission layer; and a network interface unit to control transmission of the divided data stream using the parameter set. The method includes dividing the data stream according to a type of a video frame; selecting a parameter set for separate transmission control of the divided data stream; and controlling transmission of the divided data stream using the selected parameter set.

Abstract: A software-controlled communication method and an apparatus thereof is disclosed. The apparatus includes a radio frequency (RF) front end unit for sending a data signal or a voice signal to a cordless phone base station via an antenna, an analog-to-digital for converting an analog signal received from the RF front end unit into a digital signal and a digital-to-analog converter for converting a digital signal into an analog signal and providing the converted signal to the RF front end unit, and a baseband signal processor, having a plurality of signal processing modules for processing communication signals and a control module for controlling the signal processing modules installed therein as software modules, for providing cordless phone and handset transceiver functions.

Abstract: A network relay apparatus and method using a software module that easily support various network protocols and new network protocols. The network relay apparatus includes a first modem unit communicating with a first network using a first protocol, a second modem unit communicating with a second network using a second protocol, a bridge unit converting data to be suitable for the first and second protocols when the data is exchanged between the first modem unit and the second modem unit, and a controller generating the first and second modem units and the bridge unit in a software manner.