Patents Assigned to Postech Foundation
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Patent number: 6858251Abstract: A lanthanum complex of formula (I) having a low evaporation temperature can be used as a useful precursor for MOCVD of a BLT thin layer on semiconductor devices. wherein A is pentamethyldiethylenetriamine(PMDT) or triethoxytriethyleneamine(TETEA).Type: GrantFiled: May 9, 2002Date of Patent: February 22, 2005Assignee: Postech FoundationInventors: Shi-Woo Rhee, Sang-Woo Kang
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Patent number: 6803791Abstract: A receiver performs on data to clock skew compensation by compensating ISI between signals, the ISI being caused by a bandwidth limitation generated in case of chip-to-chip communications in a digital system. A problem of an attenuation of a high frequency signal may occur due to an attenuation in a channel in case of a transmission of a signal at a high speed in the digital system. Therefore there is a limitation in transmitting data at a high speed. The receiver provides a circuit for applying an equalizing technology at the terminal of the receiver. And by compensating for the attenuation of a high frequency component of the signal by using the circuit, the transmission of a signal at a high speed is realized by over-sampling the signal and compensating the data to clock skew.Type: GrantFiled: January 22, 2003Date of Patent: October 12, 2004Assignees: Samsung Electronics Co., Ltd., Postech FoundationInventors: Hong-June Park, Young-Soo Sohn
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Patent number: 6798674Abstract: A half-bridge converter having an improved power factor is provided. The half-bridge converter has a bridge diode unit for providing a current path to a power factor improving unit and transmitting energy to a voltage smoothing capacitor; the voltage smoothing capacitor for storing energy provided by the bridge diode unit; and a switching unit having two switches serially connected between both ends of the voltage smoothing capacitor, in which the power factor improving unit for feeding the voltage of the common connection point of the switches forming the switching unit back to the common connection point of the input capacitors so as to change an input current according to the magnitude of the input voltage is further included. According to the half-bridge converter, conducting loss occurring in the switching unit decreases and the power factor of the input terminal is improved.Type: GrantFiled: October 18, 2002Date of Patent: September 28, 2004Assignee: Postech FoundationInventor: Bong-Hwan Kwon
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Patent number: 6795749Abstract: A method for automatically generating a part program for us in a STEP-NC (STEP-Compliant Data Interface for Numerical Controls) controller in a SFP (shop-floor programming) system based on an ISO 14649 data model is provided. First, geometric kernel data is generated by interpreting a STEP physical file or an ISO 14649 part program. Then, manufacturing features are recognized from the geometric kernel data and a process plan according to the ISO 14649 is established. Thereafter, the process plan is edited and an ISO 14649 part program is generated. Subsequently, a tool path is created based on manufacturing feature information specified in the ISO 14649 part program and the produced tool path is verified in a CNC (computer-based numerical control) apparatus. By including functions of a CAD/CAPP/CAM system, the present invention makes it possible to readily generate a part program for use in the STEP-NC on the CNC controller.Type: GrantFiled: September 3, 2003Date of Patent: September 21, 2004Assignee: Postech FoundationInventors: Suk-Hwan Suh, Sang-Uk Cheon, Byeong-Eon Lee
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Patent number: 6776864Abstract: A process, which comprises forming a metal micro-pattern on the surface of an inorganic substrate, surface-treating the surface of the metal micro-pattern and the surface of the plastic substrate to make it chemically reactive, and bringing the metal micro-pattern into contact with the surface of the plastic substrate to transfer the metal micro-pattern from the surface of the inorganic substrate to the surface of the plastic substrate, can be easily and simply carried out using conventional equipments to produce one or more metal pattern fixed on a plastic material.Type: GrantFiled: August 2, 2002Date of Patent: August 17, 2004Assignee: Postech FoundationInventors: Jong Hoon Hahn, Yong Min Park, Young Chan Kim, Bong Chu Shim
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Patent number: 6774199Abstract: The present invention relates to a polymer of formula (I), which has a liquid crystalline side chain and exhibits switchable tackiness at a narrow temperature range around its isotropic transition temperature: wherein, R1 is R2 is selected from the group consisting of —SO2—, —C(O)—, —CH(COOH)—, —C(COOH)2—, —C(S)— and —C(NH)—; R3 is —CH2— or —CF2—; R4 is H or F; a is an integer ranging from 30 to 500; b is an integer ranging from 1 to 3; and c is an integer ranging from 3 to 20.Type: GrantFiled: October 11, 2002Date of Patent: August 10, 2004Assignee: Postech FoundationInventors: Kilwon Cho, Jeongho Cho, Jongchan Lee
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Patent number: 6774038Abstract: The present invention relates to an organometal complex and a chemical vapor deposition (CVD) or atomic layer deposition (ALD) method for preparing a metal silicate thin layer using same. The inventive method can easily prepare the metal silicate thin layer having a desired composition which can be effectively used as a gate insulating layer for various semiconductor devices.Type: GrantFiled: April 25, 2003Date of Patent: August 10, 2004Assignee: Postech FoundationInventors: Shi-Woo Rhee, Sang-Woo Kang, Won-Hee Nam
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Patent number: 6762331Abstract: The present invention discloses a method for synthesizing a calix[4]hydroquinone organic nanotube and a method for synthesizing an ultrathin, stable nanowire using said organic nanotube as a template.Type: GrantFiled: February 13, 2002Date of Patent: July 13, 2004Assignee: Postech FoundationInventors: Byung Hee Hong, Chi-Wan Lee, Kwang Soo Kim
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Patent number: 6757338Abstract: A predistortion linearizer for predistorting a radio frequency(RF) signal includes a power divider, an even order harmonics generator and a predistortion component producer. The power divider divides the RF signal into a first and a second RF signals. The even order harmonics generator, responsive to the second RF signal, generates one or more even order harmonics of the fundamental frequencies. And, the predistortion component producer produces one or more odd order harmonics from the fundamental frequencies and the even order harmonics to provide a predistorted RF signal including the fundamental frequencies and the odd order harmonics. The power divider divides the RF signal into first and second RF signals and delays the first RF signal.Type: GrantFiled: September 25, 2000Date of Patent: June 29, 2004Assignee: Postech FoundationInventors: Bumman Kim, Youngoo Yang, Young Yun Woo
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Publication number: 20040113698Abstract: A signal amplifier includes a splitter for splitting an input signal into first and second signals, first and second bias control networks for generating a base bias signal for a Doherty amplifier in accordance with a power level of the input signal, a carrier amplifier for amplifying the first input signal, a peaking amplifier for amplifying the second input signal and a Doherty output network for combining the amplified signals. Through a simplified transformation of characteristic impedances in the Doherty output network, minimization of circuitry including the signal amplifier is obtained. Further, by controlling the Doherty amplifier in accordance with the power level of the input signal, both high efficiency and high linearity of the signal amplifier are achieved.Type: ApplicationFiled: July 15, 2003Publication date: June 17, 2004Applicant: Postech FoundationInventors: Bumman Kim, Youngoo Yang
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Patent number: 6617929Abstract: Quarter wave transformers are connected to final outputs of a carrier amplifier and a peaking amplifier, which are coupled in parallel to each other, so as to induce a Doherty operation of a microwave Doherty amplifier. Load matching circuits for obtaining a microwave output matching are connected to output terminals of the carrier amplifier and the peaking amplifier. A phase tuning component is positioned behind the load matching circuit. Accordingly, a matching state can be maintained without being changed at a high power level but can be adjusted depending on phase variations at a low power level to attain efficiency enhancements and optimum linearity.Type: GrantFiled: February 19, 2002Date of Patent: September 9, 2003Assignee: Postech FoundationInventors: Bumman Kim, Youngoo Yang, Jaehyok Yi, Young Yun Woo
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Patent number: 6593067Abstract: A method for manufacturing a microstructure by using an X-ray includes the steps of selectively exposing a portion of a photosensitive material to the high energy light source, the selectively exposing step being carried out by using a photomask for defining a pattern of the microstructure and performing a heat-treatment for melting and deforming only an upper portion of the exposed portion of the photosensitive material, the upper portion of the exposed portion of the photosensitive material being exposed at an energy level between about 1 kJ/cm3 and about 20 kJ/cm3, when being exposed to the X-ray.Type: GrantFiled: February 5, 2002Date of Patent: July 15, 2003Assignee: Postech FoundationInventors: Seung Seob Lee, Sung-Keun Lee, Kwang-Cheol Lee
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Publication number: 20030064698Abstract: A mixer comprises an LO (Local Oscillator) switching circuit for switching in response to an LO signal, a driver amplifier driven in response to an RF signal, an IF generator for generating an IF signal by detecting a difference between the LO signal and the RF signal, a filter for detecting a nonlinear low frequency intermodulation component of the RF signal, a low frequency amplifier for amplifying the low frequency intermodulation component and inverting a phase of the low frequency intermodulation component and an intermodulation component feed-forwarding circuit for feed-forwarding the amplified low frequency intermodulation component to output terminals of the driver amplifier or the LO switching circuit whereby the low frequency intermodulation component can be removed. The mixer removes an intermodulation component of an input RF signal generated due to the nonlinear characteristic of an RF amplifier, thereby to improve the linearity of the mixer.Type: ApplicationFiled: October 2, 2001Publication date: April 3, 2003Applicant: Postech FoundationInventors: Bumman Kim, Younggoo Yang, Sungmin Ock
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Patent number: 6519271Abstract: A photonic quantum ring (PQR) laser diode with a plurality of laterally extending layers, one on top of another in an axial stack, comprises an active region sandwiched between an n type multi-layer distributed Bragg reflector (DBR) stack and a p type multi-layer DBR stack, wherein, along the circumference of said active region, 3 dimensional radiations are emitted with various wavelengths over a predetermined tuning range, as a function of slanted view angle with respect to the stack axis. The PQR laser shows an ultra-low threshold current of &mgr;A range, T½ dependence of the spectral peak shift and a square law behavior of threshold currents.Type: GrantFiled: October 14, 1998Date of Patent: February 11, 2003Assignee: Postech FoundationInventors: O'Dae Kwon, Jung Chak Ahn, Byung Hoon Park
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Patent number: 6501824Abstract: An X-ray mask is integrated with a micro-actuator. The X-ray mask includes a mask portion, a mask holder portion, at least one elasticized supporter and a micro-actuator unit. The mask portion has a thin shuttle mass and an X-ray absorber attached on the shuttle mass. The mask holder portion is formed around the mask portion with a predetermined distance maintained therebetween. The elasticized supporter connects the mask portion and the mask holder portion elastically. The micro-actuator unit is prepared between the mask portion and the mask holder portion to precisely control a position of the mask portion when a voltage is applied.Type: GrantFiled: January 16, 2002Date of Patent: December 31, 2002Assignee: Postech FoundationInventors: Seung Seob Lee, Kwang-Cheol Lee, Sang Jun Moon
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Patent number: 6480078Abstract: A resonating apparatus includes a dielectric resonator on a dielectric supporting substrate, a fluid dielectric membrane which overspreads the dielectric resonator, and a microstrip line which is arranged in the fluid substrate membrane so that it is coupled with the dielectric resonator. The resonating apparatus reduces the conductivity loss by lengthening the distance between the dielectric supporting substrate in the higher layer and the microstrip line in the lower layer when it is used in a multi-layer circuit such as an MMIC. Further, the resonating apparatus increases the dielectric permittivity by using the dielectric resonator which has high dielectric permittivity as well as the fluid dielectric membrane. In this way, the resonating apparatus obtains high Q.Type: GrantFiled: August 20, 2001Date of Patent: November 12, 2002Assignee: Postech FoundationInventors: Bumman Kim, Junyoul Lim, Seonghan Ryu, Joung Hyun Yim
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Publication number: 20020135425Abstract: Quarter wave transformers are connected to final outputs of a carrier amplifier and a peaking amplifier, which are coupled in parallel to each other, so as to induce a Doherty operation of a microwave Doherty amplifier. Load matching circuits for obtaining a microwave output matching are connected to output terminals of the carrier amplifier and the peaking amplifier. A phase tuning component is positioned behind the load matching circuit. Accordingly, a matching state can be maintained without being changed at a high power level but can be adjusted depending on phase variations at a low power level to attain efficiency enhancements and optimum linearity.Type: ApplicationFiled: February 19, 2002Publication date: September 26, 2002Applicant: Postech FoundationInventors: Bumman Kim, Youngoo Yang, Jaehyok Yi, Young Yun Woo
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Patent number: 6274195Abstract: An organometallic complex of formula(I) having a low evaporation temperature can be used as a precursor for the MOCVD of a metal compound thin film on semiconductor devices wherein, M is Ti or Zr; R1, R2, R3 and R4 are each independently H or C1-4 alkyl; and m is an integer ranging from 2 to 5.Type: GrantFiled: April 28, 2000Date of Patent: August 14, 2001Assignee: Postech FoundationInventors: Shi-Woo Rhee, Jae-Young Shim, Jung-Hyun Lee, Dae-Hwan Kim
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Patent number: 6171958Abstract: A process for preparing a diffusion barrier on a semiconductor substrate which comprises: conducting remote plasma-enhanced metal organic chemical vapor deposition of a thin film of TiNx on said substrate using an organotitanium compound under a flow of H2 plasma, wherein x ranges from 0.1 to 1.5, provides a TiNx thin film having a low carbon content and low specific resistivity.Type: GrantFiled: January 14, 1998Date of Patent: January 9, 2001Assignee: Postech Foundation (KR)Inventors: Shi Woo Rhee, Ju Young Yun
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Patent number: 6151593Abstract: A user authentication apparatus for use in controlling access to a system inputs an owner's login name and password and then extracts the owner's timing vectors from keystroke characteristics with which the owner repeatedly types the owner's password to thereby form a training set. A neural network is trained by using each of the owner's timing vectors in the training set as an input. Thereafter, when a user inputs the owner's login name and password, it is checked if the user's password is identical to the owner's password. The user's timing vector is extracted from a keystroke characteristic to type the user's password if the checked result is affirmative, and the user is prohibited from accessing the system if otherwise. The user's timing vector is applied to the trained neural network as an input and a difference between the input and an output of the neural network is compared with a predetermined threshold.Type: GrantFiled: April 14, 1998Date of Patent: November 21, 2000Assignee: Postech FoundationInventors: Sung-Zoon Cho, Dae-Hee Han