公开(公告)号：JPH10163945A

公开(公告)日：1998-06-19

申请号：JP18624197

申请日：1997-07-11

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUN

Inventor： CHO SHINKO ,  SON EN ,  GO TOKUKICHI

IPC: H04B17/00 ,  H04B1/04 ,  H04B7/155 ,  H04B17/18 ,  H04B17/318

Abstract: PROBLEM TO BE SOLVED: To provide a up-link power control method for satellite broadcast transmission station for compensating the nonlinear characteristics of a high output amplifier used for transmission and amplifying the high frequency signal of a transmission object to an appropriate level. SOLUTION: An attenuator 42 for adjusting the level of transmission signals, a power controller 41 for controlling the attenuation of the attenuator corresponding to the reception level of beacon signals from a satellite, a converter 50 for converting the transmission signals whose level is adjusted in the attenuator 42 to the high frequency signals and the high output amplifier 60 for amplifying the converted high frequency signals and transmitting them to the satellite are provided. The power controller 41 controls the attenuation amount of the attenuator 42 so as to linearly increase the level of the high frequency signals transmitted to the satellite for the increase of the attenuation of the received beacon signals based on characteristics for compensating the nonlinear characteristics of the high output amplifier 60.

公开(公告)号：JPH10136001A

公开(公告)日：1998-05-22

申请号：JP19219497

申请日：1997-07-17

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUN

Inventor： SHA EIKYOKU ,  KIN SHOGO ,  ZEN SHOGAN ,  KIN EKIKIN ,  RI KEIKO

IPC: H04Q3/00 ,  H04L12/42 ,  H04L12/813 ,  H04L12/825 ,  H04L12/853 ,  H04Q7/24 ,  H04L12/28

Abstract: PROBLEM TO BE SOLVED: To cancel congested state of traffic by permitting a wideband terminal equipment (B-TE) to execute transmission by means of exceeding bond width mediated by call/connection acceptance control and canceling a state, in which the loss of a cell in a ring easily occurs. SOLUTION: When B-TE*311 receives the cell from BTE*303 positioned on the upper stage of the ring, the cell is dropped from a CRAD part 319 to an AAL reception part 318, if the transmission destination of the cell is for oneself. When the transmission destination is not for oneself, the cell is relayed to the ring in the direction of downstream via the CRAD part 319. Then, the functions of drop and relay are executed simultaneously. The cell in respective B-TE* is dropped and relayed, based on information of a virtual channel identifier and virtual route identifier in the header of the ATM cell. Four kinds of queues are used for respective B-TE*311 which are the multi-access wide band terminals.

公开(公告)号：JPH1063183A

公开(公告)日：1998-03-06

申请号：JP12452497

申请日：1997-05-14

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUN AUTHORITY

Inventor： JIYANUON RII ,  HIYUNSUUKU CHIYOO ,  JIYONSEOOKU CHIYAE ,  KIYOON HO

IPC: G09C1/00 ,  H04B1/38 ,  H04H20/00 ,  H04L9/06 ,  H04N21/2347 ,  H04N21/266 ,  H04H1/00 ,  H04N7/16

Abstract: PROBLEM TO BE SOLVED: To make a data encryption method not inferior in terms of execution speed as well while maintaining high safety and confidentiality, by adding a byte shift function and dynamic allocation transform scheme to conventional data encryption standard algorithm. SOLUTION: The bit shift function(BSF) is executed before a right side block (32 bit)) is applied to the next round to deal with a linear cryptoanalysis. Namely, the bit shift function(BSF) is a method for comparing the input and output of an S box, analyzing the correlative relation thereof and determining a linear approximation equation relating to the nonlinear S box. The input of the bit shift function(BSF) is shifted by using a module path as an element for dealing with relating to the linear cryptoanalysis method. The dynamic allocation transform (DATA) is executed by using the round key (Ki) formed in order to intensify the function of an (f) function after the bit shift function(BSF) is executed. The confidentiality of the data is improved by proving the method with the element relating to differential cryptoanalysis.

公开(公告)号：JP2002171288A

公开(公告)日：2002-06-14

申请号：JP2000376306

申请日：2000-12-11

Applicant: KOREA TELECOMMUN

Inventor： BAK SANG MAN ,  BAEK KI JIN ,  CHUNG IL KIM

IPC: H04L12/28 ,  H04L12/701 ,  H04L12/721 ,  H04L12/733 ,  H04L12/741 ,  H04L12/801 ,  H04L12/911 ,  H04L12/56

Abstract: PROBLEM TO BE SOLVED: To overcome the problem that reduction of data transmission capabil ity or the like is caused to degrade the performance of the Internet because data processing is delayed according as a packet passes the same data transmis sion route reaching an objective mode, due to fixed data in a routing table. SOLUTION: With respect to a routing method for distribution of the traffic load in a packet network, an intermediate node address and an objective node address are given to a packet as the transmission object on the basis of information stored in the routing table in the packet network, where many nodes are constituted, so that the prescribed packet may be transmitted to the objective node through the shortest route, and the packet is transmitted to the objective mode through the shortest route between an intermediate node and the objective node after being transmitted to the intermediate node through the shortest route between the departure node and the intermediate node, and thus the data transmission route is varied in accordance with the intermediate node.

公开(公告)号：JP2001292083A

公开(公告)日：2001-10-19

申请号：JP2001035142

申请日：2001-02-13

Applicant: KOREA TELECOMMUN

Inventor： KO SHOSHAKU

IPC: H04L29/14 ,  G06F13/00 ,  G08B13/196 ,  G08B25/00 ,  G08B25/08 ,  H04B3/46 ,  H04L12/26 ,  H04M11/00 ,  H04N7/18 ,  H04Q9/00

Abstract: PROBLEM TO BE SOLVED: To provide a remote monitor system and a remote monitor method that utilize an ADSL MODEM in a reverse direction and compress and transmit video data or video and audio data so as to remotely monitor the transmission state in real time. SOLUTION: The remote monitor system is provided with a monitor camera 32 or the like that outputs monitor data in an ATM 31, a remote monitor image data processing unit 34 that monitors operations of each channel to generate a sensing signal so that the monitor data are compression-coded onto a bit stream and the resulting stream is transmitted, a 1st ADSL modem 36 that is set in the reverse direction so that the modem 36 modulates an output of the processing section 24 to be sent in an incoming direction at a transmission rate faster than that of data in an outgoing direction and demodulates data modulated and transmitted from a central station 38 to be sent to the remote monitor image data processing unit 34, and a 2nd ADSL modem 37 that is set in a reverse direction so that the modem 37 demodulates the data modulated and sent from the modem 36 to be sent to the central station 38 and modulates the data sent from the central station 38 to the 1st ADSL modem 36 at a transmission rate slower than that of the data in the incoming direction.

公开(公告)号：JPH11154934A

公开(公告)日：1999-06-08

申请号：JP17030698

申请日：1998-06-17

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUN

Inventor： PARK CHANG-SOO ,  RI ZAISHO ,  LEE DONG-HO ,  RI SOAI

IPC: H04J14/00 ,  H04B10/2563 ,  H04J1/08 ,  H04J14/02 ,  H04Q11/00

Abstract: PROBLEM TO BE SOLVED: To allow even a multi-channel system of several tens or more channels to be applied to by setting N-sets of channels, where a difference between frequencies of two channels always exists, so as to form a unit group and by setting such a group repetitively and periodically so that channel interference is minimized. SOLUTION: A channels set is defined for found and optimized unequal interval channels of a proper number so that an interval of two optional channels is always different and the channels are arranged periodically. Thus, channel interference due to mixture of four optical waves through a fiber is effectively suppressed and the extension of channels is available without revision of existing channel slots. Thus, the multi-channel optical transmission system with compatibility has been realized.

公开(公告)号：JPH10336074A

公开(公告)日：1998-12-18

申请号：JP6333098

申请日：1998-03-13

Applicant: KOREA TELECOMMUN

Inventor： ROH JUNE CHUL ,  CHOI YANG HO ,  PYO HYUN MYUNG

IPC: H04B1/707 ,  H04B7/24 ,  H04B7/26 ,  H04J11/00 ,  H04J13/16 ,  H04W28/18

Abstract: PROBLEM TO BE SOLVED: To easily house user information of variable rates and to reduce interference concerning a specific rate by performing diffusion by a long pseudo noise(PN) code with the same code offset and performing diffusion by a long PN code with mutually different code offsets depending on the velocity of a digital bit. SOLUTION: When a value obtained by squaring a digital bit velocity and the length of an orthogonal code is equal to a chip velocity, after performing diffusion by the orthogonal code by a group of orthogonal diffusing devices 31, this output is switched to a group of long PN diffusing devices 33. The group 33 performs diffusion by long PN codes with the same code offset. When the value obtained by squaring the digital bit velocity and the length of the orthogonal code is not equal to the chip velocity, traffic data is switched to the group 33. The group 33 executes diffusion by the long PN code with the mutually different code offset.

公开(公告)号：JPH10336034A

公开(公告)日：1998-12-18

申请号：JP26751097

申请日：1997-09-30

Applicant: KOREA TELECOMMUN

Inventor： HAN IL SONG ,  CHOI YOUNG JAE ,  KIM DAE HWAN

IPC: G06F3/05 ,  H03K21/00 ,  H03M1/54 ,  H03M1/60

Abstract: PROBLEM TO BE SOLVED: To execute fast analog arithmetic through the use of an analog voltage value by providing a pulse extracting means and an electric discharging means, etc., for discharging the current of an electric storing means while being fed back with the output of the pulse extracting means as a control means. SOLUTION: The pulse output of a pulse extracting part 13 is fed back as the control signal to turn on the third analog switch 140 of an electric charge discharging part 14. Thereby, the current of a capacitor 111 is discharged through an electric discharge adjusting part 141. This process continues until the voltage of the capacitor 111 becomes smaller than the reference voltage of a voltage comparator 121, and a pulse extraction part 13 outputs a pulse in the cycle of a master clock. Consequently, a voltage/pulse converter which is capable of fast analog arithmetic through the use of an analog voltage value in analog signal processing and analog/digital mix signal processing is obtained by changing a pulse by the voltage change of the capacitor 111.

公开(公告)号：JPH10269309A

公开(公告)日：1998-10-09

申请号：JP27006797

申请日：1997-10-02

Applicant: KOREA TELECOMMUN

Inventor： HAN IL SONG

IPC: G06G7/28 ,  G06F15/18 ,  G06N3/06 ,  G06N3/063

Abstract: PROBLEM TO BE SOLVED: To economically constitute a high density neural network neuron by analogically and directly constituting a circuit required for the continuous function conversion of a neural network output function and a ramp function and providing a differentiation possible function in an output function. SOLUTION: A controlled continuous ramp converter is constituted of three analog switches S1-S3 and two metal oxide film semiconductor electric field effect transistors M1 and M2. The on/off states of the analog switches S1-S3 are controlled by an input signal from an outside. When the analog switch S1 becomes the off-state and only the analog switch S2 becomes the on-state, a voltage V0 which is applied and stored in a capacitor C through the use of a transmission characteristic being equal to or below a critical value is utilized is limited to a max. value and a min. value by an operation controlled by the current I of the metal oxide film semiconductor electric field effect transistor M1 and the current I of the metal oxide film semiconductor electric field effect transistor M2 and respective approximate values of them are converted into the differentiation possible connecting function of an index function so as to be stored in the capacitor C.

公开(公告)号：JPH10178623A

公开(公告)日：1998-06-30

申请号：JP22799697

申请日：1997-08-25

Applicant: KOREA ELECTRONICS TELECOMM ,  KOREA TELECOMMUN

Inventor： KAN TOKI ,  SAI SOSEKI

IPC: H04N7/08 ,  H04H20/00 ,  H04H20/74 ,  H04H60/07 ,  H04H60/15 ,  H04H60/23 ,  H04L9/18 ,  H04L9/36 ,  H04N7/081 ,  H04N7/20 ,  H04H1/00

Abstract: PROBLEM TO BE SOLVED: To reduce costs to acquire stability and reliability by separately providing a circuit which makes a compressed data stream a system packet and a scrambling control circuit to the circuit in accordance with each channel of audio and video and later multiplexing it. SOLUTION: In a channel scrambling part 200, MPEG 2 system packet stream generating parts 210 and 240 generate a system packet for each channel of video and audio. Scramblers 230 and 260 scramble a payload part with a control word of each channel of video and audio as a key. For instance, on the video channel side, when the part 210, a scramble ON/OFF path controller 220, the scrambler 230 are formed in one module, the timing control of a circuit operation is simple and design is easy in each module.