Patents by Inventor Ying Chang Liang
Ying Chang Liang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9670084Abstract: A method for treating wastewater containing TMAH and ammonium nitrogen includes the steps of (a) introducing a first solution which contains ammonium nitrogen but no TMAH into a single reactor with microorganisms comprising nitrifying bacteria and anammox bacteria, and denitrifying the first solution by the microorganisms under a dissolved oxygen concentration ranging from 0.1-0.5 mg/L and a pH value of 7-8; (b) when the denitrification efficiency reaches a steady state, introducing a second solution which contains ammonium nitrogen and TMAH and has a concentration of TMAH lower than 60 mg/L into the reactor; and (c) gradually increasing the concentration of TMAH in the solution to be added into the reactor for several times whenever the denitrification efficiency reaches a steady state. Accordingly, the inhibition of TMAH to the anammox bacteria can be significantly decreased, and both TMAH and the ammonium nitrogen can be treated simultaneously.Type: GrantFiled: March 5, 2014Date of Patent: June 6, 2017Assignees: Leaderman & Associates Co., Ltd., National Chiao Tung UniversityInventors: Der-Ming Lee, Ming-Kuei Chiang, Chin-Te Chen, Keng-Chuan Sung, Chien-Ju Lan, Jih-Gaw Lin, Ying-Chang Liang
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Publication number: 20150076060Abstract: A method for treating wastewater containing TMAH and ammonium nitrogen includes the steps of (a) introducing a first solution which contains ammonium nitrogen but no TMAH into a single reactor with microorganisms comprising nitrifying bacteria and anammox bacteria, and denitrifying the first solution by the microorganisms under a dissolved oxygen concentration ranging from 0.1-0.5 mg/L and a pH value of 7-8; (b) when the denitrification efficiency reaches a steady state, introducing a second solution which contains ammonium nitrogen and TMAH and has a concentration of TMAH lower than 60 mg/L into the reactor; and (c) gradually increasing the concentration of TMAH in the solution to be added into the reactor for several times whenever the denitrification efficiency reaches a steady state. Accordingly, the inhibition of TMAH to the anammox bacteria can be significantly decreased, and both TMAH and the ammonium nitrogen can be treated simultaneously.Type: ApplicationFiled: March 5, 2014Publication date: March 19, 2015Applicants: NATIONAL CHIAO TUNG UNIVERSITY, LEADERMAN & ASSOCIATES CO., LTD.Inventors: Der-Ming LEE, Ming-Kuei CHIANG, Chin-Te CHEN, Keng-Chuan SUNG, Chien-Ju LAN, Jih-Gaw LIN, Ying-Chang LIANG
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Patent number: 8923771Abstract: According to embodiments of the present invention, a method for identifying one or more frequency bands in a received signal. The method comprising: calculating a wavelet product of the received signal; setting a threshold for local maxima of the wavelet product; and detecting one or more edges in the received signal based on local maxima of the wavelet product which are greater than the threshold to identify one or more frequency bands in the received signal. A corresponding apparatus and computer program product are also provided. Embodiments also relate to a method for evaluating performance of a method for identifying one or more frequency bands in a received signal. A corresponding apparatus and computer program product are also provided.Type: GrantFiled: August 23, 2011Date of Patent: December 30, 2014Assignee: Agency for Science, Technology and ResearchInventors: Yong Hong Zeng, Ying Chang Liang
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Patent number: 8619920Abstract: A transmitter comprises a first spreading unit configured to multiply each of multiple data symbols with a first spreading code sequence of a first spreading factor; a compression and repetition unit configured to compress output signals of the first spreading unit in time domain and repeat the compressed signal L times (where L is a natural number greater than or equal to 2); a phase modulation unit configured to multiply the compressed and repeated signal with a user dependent phase and output a data block consisting of L sub-blocks; a second spreading unit configured to replicate the data block according to a second spreading factor and multiply each set of the replicated sub-blocks with a second spreading code sequence of the second spreading factor to produce a two-dimensionally spread signal; and a wireless transmission unit configured to transmit the two-dimensionally spread signal using a single-carrier transmission scheme.Type: GrantFiled: November 5, 2008Date of Patent: December 31, 2013Assignees: NTT DoCoMo, Inc., Agency for Science, Technology and ResearchInventors: Hiroyuki Atarashi, Mamoru Sawahashi, Francois Po Shin Chin, Zhongding Lei, Xiaoming Peng, Ying-Chang Liang
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Patent number: 8615211Abstract: A method for spectrum sensing is described comprising receiving a signal using a plurality of receive antennas; forming a set of received signals including the received signal of each antenna; determining a cyclic auto-correlation of the set of received signals; estimating, for each receive antenna, channel state information of the radio channel via which the receive antenna receives the signal based on the determined cyclic auto-correlation; performing maximum ratio combining of the received signal samples based on the estimated channel state information; determining a measure of the cyclostationarity of the received signal based on the result of the maximum ratio combining; and performing cyclostationarity detection spectrum sensing based on the determined measure of the cyclostationarity of the received signal.Type: GrantFiled: January 25, 2011Date of Patent: December 24, 2013Assignee: Agency for Science, Technology and ResearchInventors: Jitvanichphaibool Kommate, Ying Chang Liang, Yong Hong Zeng
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Publication number: 20130225105Abstract: According to embodiments of the present invention, a method for identifying one or more frequency bands in a received signal. The method comprising: calculating a wavelet product of the received signal; setting a threshold for local maxima of the wavelet product; and detecting one or more edges in the received signal based on local maxima of the wavelet product which are greater than the threshold to identify one or more frequency bands in the received signal. A corresponding apparatus and computer program product are also provided. Embodiments also relate to a method for evaluating performance of a method for identifying one or more frequency bands in a received signal. A corresponding apparatus and computer program product are also provided.Type: ApplicationFiled: August 23, 2011Publication date: August 29, 2013Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Yong Hong Zeng, Ying Chang Liang
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Patent number: 8433009Abstract: A method of determining as to whether a received signal includes a data signal is provided. The method provided includes determining a first value based on a cyclic auto-correlation of the received signal and determining a second value based on the cyclic auto-correlation of the received signal. The method provided further includes determining as to whether a received signal includes a data signal based on a comparison of the first value and the second value.Type: GrantFiled: May 7, 2008Date of Patent: April 30, 2013Assignee: Agency for Science, Technology and ResearchInventors: Yonghong Zeng, Choo Leng Koh, Ying-Chang Liang
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Publication number: 20130045703Abstract: A method for spectrum sensing is described comprising receiving a signal using a plurality of receive antennas; forming a set of received signals including the received signal of each antenna; determining a cyclic auto-correlation of the set of received signals; estimating, for each receive antenna, channel state information of the radio channel via which the receive antenna receives the signal based on the determined cyclic auto-correlation; performing maximum ratio combining of the received signal samples based on the estimated channel state information; determining a measure of the cyclostationarity of the received signal based on the result of the maximum ratio combining; and performing cyclostationarity detection spectrum sensing based on the determined measure of the cyclostationarity of the received signal.Type: ApplicationFiled: January 25, 2011Publication date: February 21, 2013Inventors: Jitvanichphaibool Kommate, Ying Chang Liang, Yong Hong Zeng
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Patent number: 8315297Abstract: An embodiment of the invention provides a method for classifying a received signal. The method includes determining a covariance matrix of signal values of the received signal, and determining an eigenvalue matrix of the covariance matrix. The eigenvalue matrix includes the eigenvalues of the covariance matrix. A first function is determined from at least one eigenvalue of the eigenvalues of the covariance matrix. A second function is determined from at least one eigenvalue of the eigenvalues of the covariance matrix, wherein the second function is different from the first function. Dependent from a comparison between a value of the first function and a value of the second function, the received signal is classified into a signal comprising data or into a noise signal.Type: GrantFiled: July 5, 2007Date of Patent: November 20, 2012Assignee: Agency for Science, Technology and ResearchInventors: Yonghong Zeng, Ying-Chang Liang
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Patent number: 8259783Abstract: A method of determining as to whether a received signal includes an information signal is provided. The method provided includes determining a covariance matrix from a received signal and transforming the covariance matrix into a transformed covariance matrix, wherein the transformation is configured such that the transformed covariance matrix is a non-diagonal matrix in case the received signal includes the information signal, wherein the non-diagonal matrix includes non-zero non-diagonal matrix elements. The method provided further includes determining a first function using at least one of the non-zero non-diagonal matrix elements of the transformed covariance matrix, determining a second function using at least one matrix element of the transformed covariance matrix, wherein the second function is different from the first function, and determining as to whether a received signal includes an information signal based on a comparison of a value of the first function and a value of the second function.Type: GrantFiled: November 7, 2007Date of Patent: September 4, 2012Assignee: Agency for Science, Technology and ResearchInventors: Yonghong Zeng, Ying-Chang Liang
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Patent number: 8204071Abstract: A method of allocating frequency ranges to at least one communication device is provided. The method comprises determining available frequency ranges within a plurality of frequency ranges, combining the available frequency ranges to at least one combined logical frequency range, and allocating the at least one combined logical frequency range to the at least one communication device.Type: GrantFiled: November 3, 2006Date of Patent: June 19, 2012Assignee: Agency for Science, Technology and ResearchInventors: Ying Chang Liang, Yonghong Zeng, Zhongding Lei, Po Shin Francois Chin
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Patent number: 8204072Abstract: A method of determining available frequency ranges for at least one communication device is provided. The method comprises providing a downlink transmission time interval, determining available frequency ranges within a plurality of frequency ranges after the downlink transmission time interval, and providing an uplink transmission time interval after the determining of the available frequency ranges.Type: GrantFiled: November 7, 2006Date of Patent: June 19, 2012Assignee: Agency for Science, Technology and ResearchInventors: Ying Chang Liang, Anh Tuan Hoang, Ashok Kumar Marath, Zhongding Lei, Po Shin Francois Chin
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Patent number: 8144827Abstract: A method of determining a residual frequency offset between a transmitter and a receiver in a transmission of data via a communication channel, is described, wherein the message is transmitted from the transmitter to the receiver via the communication channel and the message comprises at least one short preamble (201), at least one long preamble (202) and user data (203). The at least one long preamble (202) comprises residual frequency offset determination information based on which the residual frequency offset is determined.Type: GrantFiled: August 13, 2005Date of Patent: March 27, 2012Assignee: Agency for Science, Technology and ResearchInventors: Ho Wang Fung, Sumei Sun, Chin Keong Ho, Ying Chang Liang, Yan Wu, Zhongding Lei
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Publication number: 20110249776Abstract: A method of determining as to whether a received signal includes a data signal is provided. The method provided includes determining a first value based on a cyclic auto-correlation of the received signal and determining a second value based on the cyclic auto-correlation of the received signal. The method provided further includes determining as to whether a received signal includes a data signal based on a comparison of the first value and the second value.Type: ApplicationFiled: May 7, 2008Publication date: October 13, 2011Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Yonghong Zeng, Choo Leng Koh, Ying-Chang Liang
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Publication number: 20110243197Abstract: A transmitter comprises a first spreading unit configured to multiply each of multiple data symbols with a first spreading code sequence of a first spreading factor; a compression and repetition unit configured to compress output signals of the first spreading unit in time domain and repeat the compressed signal L times (where L is a natural number greater than or equal to 2); a phase modulation unit configured to multiply the compressed and repeated signal with a user dependent phase and output a data block consisting of L sub-blocks; a second spreading unit configured to replicate the data block according to a second spreading factor and multiply each set of the replicated sub-blocks with a second spreading code sequence of the second spreading factor to produce a two-dimensionally spread signal; and a wireless transmission unit configured to transmit the two-dimensionally spread signal using a single-carrier transmission scheme.Type: ApplicationFiled: November 5, 2008Publication date: October 6, 2011Applicants: NTT DOCOMO, INC., AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Hiroyuki Atarashi, Mamoru Sawahashi, Francois Po Shin Chin, Zhongding Lei, Xiaoming Peng, Ying-Chang Liang
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Patent number: 7986743Abstract: A method for transmitting a digital signal is described, wherein the digital signal is to be transmitted by a plurality of antennas and a 2-domain pre-transformation is carried out, i.e., in course of a pre-transformation modulation symbols assigned to subcarriers having different frequencies and assigned to subcarriers sent by different antennas are linearly combined.Type: GrantFiled: August 3, 2005Date of Patent: July 26, 2011Assignee: Agency for Science, Technology and ResearchInventors: Chin Keong Ho, Yan Wu, Sumei Sun, Zhongding Lei, Ho Wang Fung, Ying Chang Liang
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Patent number: 7970064Abstract: A transmitter that has a determination unit for determining a plurality of symbols (301) such that each symbol (301) has a tail component (302) and the plurality is determined in such a way that the tail components (302) are substantially equal and a tone generation unit for arranging the plurality of symbols (301) to form a plurality of long preambles (300) such that the plurality of long preambles (300) are tone-interleaved.Type: GrantFiled: August 13, 2005Date of Patent: June 28, 2011Assignee: Agency for Science, Technology and ResearchInventors: Ho Wang Fung, Sumei Sun, Chin Keong Ho, Ying Chang Liang, Yan Wu, Zhongding Lei
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Patent number: 7894516Abstract: A method for equalizing a digital signal received via at least one communication channel is described, wherein a block of received signal values is processed by a block-iterative equalizer (200). The equalizer comprises a feedback unit (202) and a feed-forward unit (201) each corresponding to the multiplication by a respective matrix. The matrices are updated in the iterative process.Type: GrantFiled: August 15, 2005Date of Patent: February 22, 2011Assignee: Agency for Science, Technology and ResearchInventors: Ying Chang Liang, Sumei Sun, Chin Keong Ho
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Publication number: 20100111235Abstract: A method of determining as to whether a received signal includes an information signal is provided. The method provided includes determining a covariance matrix from a received signal and transforming the covariance matrix into a transformed covariance matrix, wherein the transformation is configured such that the transformed covariance matrix is a non-diagonal matrix in case the received signal includes the information signal, wherein the non-diagonal matrix includes non-zero non-diagonal matrix elements. The method provided further includes determining a first function using at least one of the non-zero non-diagonal matrix elements of the transformed covariance matrix, determining a second function using at least one matrix element of the transformed covariance matrix, wherein the second function is different from the first function, and determining as to whether a received signal includes an information signal based on a comparison of a value of the first function and a value of the second function.Type: ApplicationFiled: November 7, 2007Publication date: May 6, 2010Inventors: Yonghong Zeng, Ying-Chang Liang
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Publication number: 20100061256Abstract: A method of determining whether a frequency channel is available for data transmission for a communication device is provided. The method provided comprises dynamically selecting a time interval for determining whether the frequency channel is available for data transmission for the communication device. The method provided further comprises determining whether the frequency channel is available for data transmission for the communication device, during the time interval selected.Type: ApplicationFiled: May 25, 2007Publication date: March 11, 2010Applicant: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Chee Wei Ang, Peng Yong Kong, Anh Tuan Hoang, Ying-Chang Liang, Haiguang Wang