KR20080065712A - Remote control method of computer using portable memory device - Google Patents

Remote control method of computer using portable memory device Download PDF

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KR20080065712A
KR20080065712A KR1020070002692A KR20070002692A KR20080065712A KR 20080065712 A KR20080065712 A KR 20080065712A KR 1020070002692 A KR1020070002692 A KR 1020070002692A KR 20070002692 A KR20070002692 A KR 20070002692A KR 20080065712 A KR20080065712 A KR 20080065712A
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storage device
portable storage
computer
remote control
remote
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KR1020070002692A
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Korean (ko)
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황선명
이제민
이한웅
정일재
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학교법인 대전기독학원
황선명
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Priority to KR1020070002692A priority Critical patent/KR20080065712A/en
Publication of KR20080065712A publication Critical patent/KR20080065712A/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
    • G06F21/305—Authentication, i.e. establishing the identity or authorisation of security principals by remotely controlling device operation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/50—Monitoring users, programs or devices to maintain the integrity of platforms, e.g. of processors, firmware or operating systems
    • G06F21/57—Certifying or maintaining trusted computer platforms, e.g. secure boots or power-downs, version controls, system software checks, secure updates or assessing vulnerabilities
    • G06F21/575—Secure boot
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/44—Arrangements for executing specific programs
    • G06F9/4401—Bootstrapping
    • G06F9/4406—Loading of operating system

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  • Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Stored Programmes (AREA)

Abstract

A method for controlling a computer remotely by using a portable storage device is provided to improve security largely by enabling a control computer to control other computers with a remote control program stored in the portable storage device, and leaving no information related to remote control in the control computer when the portable storage device is removed. A portable storage device(10) including a remote control program and an OS(Operating System) is connected to a control computer(20). The control computer connects with a controlled computer(30) through RDP(Remote Desktop Protocol) by operating the remote control program and the OS stored in the portable storage device when the portable storage device is selected in the control computer. The remote control program and the OS stored in the portable storage device are terminated when a task is completed. The portable storage device is removed from the control computer. The portable storage device is a USB(Universal Serial Bus) memory and the OS is implemented by using a Linux kernel. The portable storage device includes a minimum kernel and a boot loader loading the kernel on a memory to execute only the remote control program.

Description

휴대용 저장장치를 이용한 컴퓨터 원격제어방법 {Remote Control Method of Computer Using Portable Memory Device}Remote Control Method of Computer Using Portable Memory Device

도 1은 본 발명에 따른 휴대용 저장장치를 이용한 컴퓨터 원격제어방법의 일실시예를 설명하기 위한 블록도.1 is a block diagram illustrating an embodiment of a computer remote control method using a portable storage device according to the present invention.

도 2는 본 발명에 따른 휴대용 저장장치를 이용한 컴퓨터 원격제어방법의 일실시예를 나타내는 순서도.2 is a flow chart showing an embodiment of a computer remote control method using a portable storage device according to the present invention.

도 3은 본 발명에 따른 휴대용 저장장치를 이용한 컴퓨터 원격제어방법의 일실시예를 나타내는 개념 구성도.3 is a conceptual diagram showing an embodiment of a computer remote control method using a portable storage device according to the present invention.

** 도면의 주요 부분에 대한 부호의 설명 **** Description of symbols for the main parts of the drawing **

10...휴대용 저장장치10 ... Portable Storage

20...제어용 컴퓨터20.Control computer

30...원격 컴퓨터30.Remote computer

본 발명은 휴대용 저장장치를 이용한 컴퓨터 원격제어방법에 관한 것으로서, 보다 상세하게는 휴대용 저장장치에 원격제어용 프로그램을 탑재하여 다른 컴퓨터를 원격제어하는 것에 의하여 사용한 컴퓨터에 흔적을 남기지 않아 해킹이나 도용을 방지하는 것이 가능한 휴대용 저장장치를 이용한 컴퓨터 원격제어방법에 관한 것이다.The present invention relates to a computer remote control method using a portable storage device, and more particularly, to mount a remote control program on the portable storage device to prevent hacking or theft without leaving a trace on a used computer by remotely controlling another computer. The present invention relates to a computer remote control method using a portable storage device.

일반적으로 어느 컴퓨터(이하 "제어용 컴퓨터"라 한다)에서 다른 컴퓨터(이하 "원격 컴퓨터"라 한다)를 원격제어하기 위해서 제어용 컴퓨터에 원격제어용 프로그램을 로딩(탑재)한 상태에서 원격 컴퓨터를 접속하여 제어하는 기술이 많이 알려져 있다.In general, in order to remotely control one computer (hereinafter referred to as a "control computer") from another computer (hereinafter referred to as a "remote computer"), the remote computer is controlled by connecting a remote computer with a remote control program loaded (loaded). Many techniques are known.

그러나 상기와 같은 기술에 있어서는 제어용 컴퓨터에 원격 컴퓨터를 원격제어하기 위하여 사용된 프로그램과 기록들이 남아있게 된다. 따라서 제3자에 의하여 원격제어를 위한 정보가 유출될 우려가 있고, 제3자가 제어용 컴퓨터를 이용하여 원격 컴퓨터에 무단으로 접속하여 시스템에 혼란을 야기할 우려도 있다. 나아가 인터넷뱅킹 등에 필요한 인증서 등 중요한 데이터가 외부로 유출되는 경우 심각한 위험을 초래하게 된다.However, in such a technique, a program and records used to remotely control a remote computer remain in the control computer. Therefore, the information for remote control may be leaked by a third party, and the third party may access the remote computer by using a control computer without permission to cause confusion in the system. Furthermore, when important data such as certificates required for internet banking are leaked to the outside, serious risks may occur.

특히 공공장소에 설치된 컴퓨터를 사용하여 원격제어를 실행하는 경우에는 상기와 같은 문제점이 매우 크다. 그리고 원격제어를 위하여 사용하는 컴퓨터에 바이러스프로그램 및 해킹 프로그램 등이 존재하는 경우에는 보안에 대한 취약성이 크게 증대된다.  In particular, when the remote control is executed using a computer installed in a public place, the above problems are very large. In addition, if a virus program or a hacking program exists in the computer used for remote control, the vulnerability to security is greatly increased.

본 발명은 상기와 같은 문제점에 착안하여 이루어진 것으로서, 휴대용 저장장치에 원격제어 프로그램을 탑재하여 다른 컴퓨터를 원격제어하는 것이 가능하므로 휴대용 저장장치를 제거하게 되면 제어용 컴퓨터에 원격제어와 관련된 정보가 남아있지 않게 되어 보안성이 크게 향상된 휴대용 저장장치를 이용한 컴퓨터 원격제어방법을 제공하는데, 그 목적이 있다.The present invention has been made in view of the above problems, it is possible to remotely control another computer by mounting a remote control program in the portable storage device, so when the portable storage device is removed, the information related to the remote control remains in the control computer. The purpose of the present invention is to provide a computer remote control method using a portable storage device with greatly improved security.

본 발명이 제안하는 휴대용 저장장치를 이용한 컴퓨터 원격제어방법은 원격제어프로그램과 구동프로그램이 탑재된 휴대용 저장장치를 제어용 컴퓨터에 연결하고, 제어용 컴퓨터를 구동시킨 상태에서 휴대용 저장장치를 선택하여 휴대용 저장장치에 탑재된 구동프로그램 및 원격제어프로그램을 작동시키고, 네트워크를 이용하여 원격 컴퓨터에 접속하고, 원격제어프로그램을 통하여 제어용 컴퓨터의 화면을 보면서 원격 컴퓨터의 작동을 제어하여 필요한 작업을 행하고, 작업이 완료된 경우 휴대용 저장장치에 탑재된 원격제어프로그램과 구동프로그램을 정지시키고, 제어용 컴퓨터로부터 휴대용 저장장치를 분리하는 과정으로 이루어진다.The computer remote control method using the portable storage device proposed by the present invention connects a portable storage device equipped with a remote control program and a driving program to a control computer, and selects a portable storage device while driving the control computer. When the operation program and the remote control program installed in the system are operated, the remote computer is connected through the network, the remote computer is controlled by the operation of the remote computer while watching the screen of the control computer to perform the necessary work, and the work is completed. Stopping the remote control program and the driving program mounted on the portable storage device, and separating the portable storage device from the control computer.

상기에서 휴대용 저장장치로는 USB 메모리 기기 등이 사용가능하다.As the portable storage device, a USB memory device may be used.

상기 휴대용 저장장치에 탑재되는 구동프로그램(OS)은 용량이 작아 휴대용 저장장치에 적합한 리눅스 커널(Linux Kernel)을 이용하여 구현하는 것이 바람직하다.The drive program (OS) mounted on the portable storage device is preferably small and implemented using a Linux kernel suitable for the portable storage device.

다음으로 본 발명에 따른 휴대용 저장장치를 이용한 컴퓨터 원격제어방법의 바람직한 실시예를 도면을 참조하여 상세하게 설명한다.Next, a preferred embodiment of a computer remote control method using a portable storage device according to the present invention will be described in detail with reference to the drawings.

먼저 본 발명에 따른 휴대용 저장장치를 이용한 컴퓨터 원격제어방법의 일실시예는 도 1∼도 3에 나타낸 바와 같이, 원격제어프로그램과 구동프로그램이 탑재(S10)된 휴대용 저장장치(10)를 제어용 컴퓨터(20)에 연결하고(S20), 제어용 컴퓨터(20)를 구동시킨 상태에서 휴대용 저장장치(10)를 선택하여 휴대용 저장장치(10)에 탑재된 구동프로그램 및 원격제어프로그램을 작동시키고(S30), 네트워크를 이용하여 원격 컴퓨터(30)에 접속하고(S40), 원격제어프로그램을 통하여 제어용 컴퓨터(20)의 화면을 보면서 원격 컴퓨터(30)의 작동을 제어하여 필요한 작업을 행하고(S50), 작업이 완료된 경우 휴대용 저장장치(10)에 탑재된 원격제어프로그램과 구동프로그램을 정지시키고(S60), 제어용 컴퓨터(20)로부터 휴대용 저장장치(10)를 분리(S70)하는 과정으로 이루어진다.First, an embodiment of a computer remote control method using a portable storage device according to the present invention is a computer for controlling a portable storage device 10 equipped with a remote control program and a driving program (S10) as shown in FIGS. In operation S20, the portable storage device 10 is selected while the control computer 20 is driven to operate the drive program and the remote control program mounted on the portable storage device 10 (S30). Access the remote computer 30 using a network (S40), control the operation of the remote computer 30 while watching the screen of the control computer 20 through the remote control program, and perform necessary operations (S50). When this is completed, the remote control program and the driving program mounted on the portable storage device 10 are stopped (S60), and the portable storage device 10 is separated from the control computer 20 (S70).

상기에서 휴대용 저장장치(10)로는 USB 메모리 기기 등이 사용가능하다.As the portable storage device 10, a USB memory device or the like can be used.

상기 휴대용 저장장치(10)에 탑재되는 구동프로그램(OS)은 용량이 작아 휴대용 저장장치(10)에 적합한 리눅스 커널(Linux Kernel)을 이용하여 구현하는 것이 바람직하다.The drive program (OS) mounted on the portable storage device 10 is preferably small and implemented using a Linux kernel suitable for the portable storage device 10.

상기 휴대용 저장장치(10)에는 원격제어프로그램만 실행할 수 있도록 최소한의 커널과 커널을 메모리에 올려주는 부트로더(boot loader)가 설치된다.The portable storage device 10 is provided with a boot loader for loading a minimum kernel and the kernel into memory so that only the remote control program can be executed.

상기에서 리눅스 커널은 시스템 관리에 필요한 커널의 모든 기능이 커널레벨에서 동작한다. 리눅스 커널은 실행중인 프로세스를 관리하며, 이 프로세스들이 사용하는 메모리를 관리하고, 파일 시스템을 관리하며 네트워크 처리를 담당한다.In the above, the Linux kernel runs all kernel functions necessary for system administration at the kernel level. The Linux kernel manages running processes, manages the memory they use, manages file systems, and handles network processing.

그리고 리눅스 커널은 하드웨어와 관련된 명령을 직접 전달하고, 이들 자원을 관리하며, 이를 사용자 프로그램에서 사용할 수 있도록 해준다.The Linux kernel directly delivers hardware-related commands, manages these resources, and makes them available to user programs.

상기와 같이 리눅스는 커널 내에 시스템 제어의 모든 기능을 가지고 있지만, 커널에 자신이 필요한 기능을 추가할 경우 전체 커널코드를 재컴파일하고 재부팅을 통하여 테스트를 해야한다는 단점이 있다.As mentioned above, Linux has all the functions of system control in the kernel, but it has the disadvantage of recompiling the entire kernel code and testing through reboot when adding the necessary functions to the kernel.

본 발명에서 리눅스 커널의 상기와 같은 단점을 극복하기 위하여 모듈구조를 사용한다. 이와 같이 모듈구조를 사용하게 되면, 각종 드라이버들은 드라이버 모듈만을 컴파일하여 커널에 쉽게 추가하는 것이 가능하다.In the present invention, the modular structure is used to overcome the above disadvantages of the Linux kernel. Using the module structure like this, various drivers can be easily added to the kernel by compiling only the driver module.

현재 리눅스 커널은 32bit x86 아키텍처 뿐만아니라 Alpha AXP, Sun SPARC, Motorora PowerPC, ARM, MIPS, Intel IA-64, AMD x86-64 등 대부분의 아키텍처에 포팅이 가능하도록 구현되고 있다.Currently, the Linux kernel is available for porting to most architectures, including 32-bit x86 architectures, as well as Alpha AXP, Sun SPARC, Motorora PowerPC, ARM, MIPS, Intel IA-64, and AMD x86-64.

상기에서 휴대용 저장장치(10)를 제어용 컴퓨터(20)에 연결하게 되면, 휴대용 저장장치(10)에 탑재된 부트로더가 실행되고, 부트로더는 커널(구동프로그램 및 원격제어프로그램)을 메모리에 올려주게 된다.When the portable storage device 10 is connected to the control computer 20, a boot loader mounted on the portable storage device 10 is executed, and the boot loader loads a kernel (a driving program and a remote control program) into a memory. Given.

그리고 비디오드라이버를 통하여 고해상도 그래픽 모드로 전환하고, 제어용 컴퓨터(20)의 네트워크 장치를 검색하여 해당 모듈을 커널에 올려준 다음, DHCP(Dynamic Host Configuration Protocol)을 통하여 IP 주소를 할당받고, 원격제어프로그램을 실행하고, RDP(Remote Desktop Protocol)를 통하여 원격 컴퓨터를 접속하여 제어한다.After switching to the high resolution graphics mode through the video driver, searching the network device of the control computer 20, uploading the corresponding module to the kernel, receiving an IP address through the Dynamic Host Configuration Protocol (DHCP), and a remote control program. And control the remote computer through RDP (Remote Desktop Protocol).

상기에서 비디오드라이버로는 VESA 드라이버를 사용하는 것이 대부분의 그래픽카드가 지원하며, 선형 메모리방식을 사용하므로 비디오 메모리 상에 직접 데이터를 입력해 주는 것만으로도 화면상에 표시가 되는 장점이 있어 바람직하다.In the above, it is preferable to use the VESA driver as a video driver, and most graphics cards support it. Since the linear memory method is used, it is preferable to input data directly into the video memory so that it is displayed on the screen. .

즉 VESA의 경우에는 출력 데이터에 뱅크 번호를 부여하여서 출력하고자 하는 뱅크의 번호를 Vesa Bios로 넘겨주게 되고, 지정된 뱅크번호에 해당하는 위치에 데이터를 출력하는 과정으로 이루어진다. 예를 들면 1024 X 768 크기의 화면을 출력할 경우 11개의 뱅크를 두어 뱅크 번호를 교환해 줌으로서 하나의 화면을 구성한다.That is, in the case of VESA, a bank number is assigned to output data, the bank number to be output is passed to Vesa Bios, and data is output to a position corresponding to the designated bank number. For example, when outputting a screen of size 1024 X 768, 11 banks are put together to form a screen by exchanging bank numbers.

또 상기에서 RDP는 마이크로소프트사에서 제작된 '터미널 서버'와 '터미널 서버 클라이언트'가 서로 통신할 수 있도록 설계된 프로토콜로, ITU T.120 Family 표준을 확장하고, 이를 기반으로 제작된 것이다. 기본적으로 멀티채널을 지원한다.In addition, RDP is a protocol designed so that 'Terminal Server' and 'Terminal Server Client' manufactured by Microsoft can communicate with each other, and are based on the ITU T.120 Family standard. Basically it supports multichannel.

본 발명에 따른 휴대용 저장장치를 이용한 컴퓨터 원격제어방법에 있어서는, 원격 컴퓨터의 화면 이미지를 네트워크를 통하여 전달받아 휴대용 저장장치의 원격제어프로그램에서 이를 전환한 다음, 제어용 컴퓨터의 화면(디스플레이장치)에 표시하도록 이루어진다. 따라서 제어용 컴퓨터의 메모리에는 원격제어와 관련된 정보가 저장되지 않는다.In the remote computer control method using a portable storage device according to the present invention, the screen image of the remote computer is received via a network, the remote control program of the portable storage device is converted to this, and then displayed on the screen (display device) of the control computer Is done. Therefore, the information related to the remote control is not stored in the memory of the control computer.

상기에서는 본 발명에 따른 휴대용 저장장치를 이용한 컴퓨터 원격제어방법의 바람직한 실시예에 대하여 설명하였지만, 본 발명은 이에 한정되는 것이 아니고 특허청구범위와 발명의 상세한 설명 및 첨부한 도면의 범위 안에서 여러가지로 변형하여 실시하는 것이 가능하고, 이 또한 본 발명의 범위에 속한다.In the above description of the preferred embodiment of a computer remote control method using a portable storage device according to the present invention, the present invention is not limited to this and various modifications within the scope of the claims and the detailed description of the invention and the accompanying drawings. It is possible to implement, and this also belongs to the scope of the present invention.

상기와 같이 이루어지는 본 발명에 따른 휴대용 저장장치를 이용한 컴퓨터 원격제어방법에 의하면, 휴대용 저장장치에 탑재된 프로그램을 실행하여 원격제어를 행하므로, 제어용으로 사용한 컴퓨터에는 아무런 기록도 남지 않게 되어 제3자에 의한 도용이나 해킹 등의 문제를 원천적으로 방지하는 것이 가능하다.According to the remote computer control method using a portable storage device according to the present invention as described above, since the remote control is executed by executing a program mounted on the portable storage device, no record is left in the computer used for the control third party It is possible to fundamentally prevent problems such as theft and hacking.

그리고 휴대용 저장장치에 탑재된 프로그램만을 구동하여 작업을 행하므로, 공공장소에 설치된 컴퓨터를 제어용 컴퓨터로 사용하는 경우에도 제어용 컴퓨터에 존재하는 바이러스에 의한 원격 컴퓨터의 감염을 방지하고, 제어용 컴퓨터에 존재하는 해킹프로그램에 의한 원격 컴퓨터의 정보 유출을 방지하는 것이 가능하다.In addition, since only the program mounted in the portable storage device is driven to perform work, even when a computer installed in a public place is used as a control computer, it prevents the infection of a remote computer by a virus present in the control computer and exists in the control computer. It is possible to prevent information leakage of the remote computer by the hacking program.

Claims (5)

원격제어프로그램과 구동프로그램이 탑재된 휴대용 저장장치를 제어용 컴퓨터에 연결하고,Connect a portable storage device equipped with a remote control program and a drive program to the control computer, 제어용 컴퓨터를 구동시킨 상태에서 휴대용 저장장치를 선택하여 휴대용 저장장치에 탑재된 구동프로그램 및 원격제어프로그램을 작동시키고,With the control computer running, select the portable storage device to operate the drive program and the remote control program mounted on the portable storage device. 네트워크를 이용하여 원격 컴퓨터에 접속하고,Connect to a remote computer using the network, 원격제어프로그램을 통하여 제어용 컴퓨터의 화면을 보면서 원격 컴퓨터의 작동을 제어하여 필요한 작업을 행하고,While watching the screen of the control computer through the remote control program to control the operation of the remote computer to perform the necessary work, 작업이 완료된 경우 휴대용 저장장치에 탑재된 원격제어프로그램과 구동프로그램을 정지시키고,When the operation is completed, stop the remote control program and the drive program installed in the portable storage device, 제어용 컴퓨터로부터 휴대용 저장장치를 분리하는 과정으로 이루어지는 휴대용 저장장치를 이용한 컴퓨터 원격제어방법.Computer remote control method using a portable storage device comprising the step of separating the portable storage device from the control computer. 청구항 1에 있어서,The method according to claim 1, 상기 휴대용 저장장치로는 USB 메모리 기기를 사용하는 휴대용 저장장치를 이용한 컴퓨터 원격제어방법.Remote control method of a computer using a portable storage device using a USB memory device as the portable storage device. 청구항 1 또는 청구항 2에 있어서,The method according to claim 1 or 2, 상기 휴대용 저장장치에 탑재되는 구동프로그램(OS)은 리눅스 커널(Linux Kernel)을 이용하여 구현하는 휴대용 저장장치를 이용한 컴퓨터 원격제어방법.A drive program (OS) mounted on the portable storage device is a computer remote control method using a portable storage device implemented using a Linux kernel (Linux Kernel). 청구항 3에 있어서,The method according to claim 3, 상기 휴대용 저장장치에는 원격제어프로그램만 실행할 수 있도록 최소한의 커널과 커널을 메모리에 올려주는 부트로더가 설치되는 휴대용 저장장치를 이용한 컴퓨터 원격제어방법.The portable storage device remote computer control method using a portable storage device is installed a boot loader for loading a minimum kernel and the kernel in memory so that only the remote control program can be executed. 청구항 4에 있어서,The method according to claim 4, 상기 휴대용 저장장치를 제어용 컴퓨터에 연결하게 되면, 휴대용 저장장치에 탑재된 부트로더가 실행되고, 부트로더는 커널(구동프로그램 및 원격제어프로그램)을 메모리에 올려주게 되고, 비디오드라이버를 통하여 고해상도 그래픽 모드로 전환하고, 제어용 컴퓨터의 네트워크 장치를 검색하여 해당 모듈을 커널에 올려준 다음, DHCP을 통하여 IP 주소를 할당받고, 원격제어프로그램을 실행하고, RDP를 통하여 원격 컴퓨터를 접속하여 제어하는 과정으로 이루어지는 휴대용 저장장치를 이용한 컴퓨터 원격제어방법.When the portable storage device is connected to the control computer, a boot loader mounted on the portable storage device is executed, and the boot loader loads a kernel (a drive program and a remote control program) into memory, and the high resolution graphic mode is performed through the video driver. Switch to the network device of the control computer, load the module into the kernel, assign an IP address through DHCP, execute the remote control program, and access and control the remote computer through RDP. Computer remote control method using a portable storage device.
KR1020070002692A 2007-01-10 2007-01-10 Remote control method of computer using portable memory device KR20080065712A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014209386A1 (en) * 2013-06-28 2014-12-31 Hewlett-Packard Development Company, L.P. Attached computing device
KR20230135323A (en) 2022-03-16 2023-09-25 김성수 Zigzag fixed blade that enhances cutting efficiency of hairdressing blade assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014209386A1 (en) * 2013-06-28 2014-12-31 Hewlett-Packard Development Company, L.P. Attached computing device
US10097369B2 (en) 2013-06-28 2018-10-09 Hewlett-Packard Development Company, L.P. Attached computing device
KR20230135323A (en) 2022-03-16 2023-09-25 김성수 Zigzag fixed blade that enhances cutting efficiency of hairdressing blade assembly

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