Patents by Inventor Yoko Kumagai
Yoko Kumagai 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).
-
Publication number: 20240109061Abstract: According to an embodiment of the present disclosure, there is provided a microplate including at least one (or a plurality of) well and an electrochemical sensor.Type: ApplicationFiled: January 21, 2022Publication date: April 4, 2024Inventors: Norikazu KATAYAMA, Yoko KUMAGAI, Narushi ITO
-
Publication number: 20240053352Abstract: An embodiment according to the present disclosure provides a method for evaluating a degree of glycation of a protein, the method including providing a solution potentially containing a target protein, bringing the solution into contact with a color indicator, bringing the solution into contact with protease, using a first reaction between the color indicator and the target protein to determine a concentration of the target protein in the solution, using a second reaction between the protease and the target protein to determine a concentration of the target protein having been glycated, and determining, based on the concentration of the target protein and the concentration of the target protein having been glycated, a degree of glycation of the target protein.Type: ApplicationFiled: January 21, 2022Publication date: February 15, 2024Inventors: Norikazu KATAYAMA, Yoko KUMAGAI, Narushi ITO, Noriko MIYAUCHI
-
Publication number: 20220382711Abstract: A data analysis system (S) including a data analysis server (11), a data retention system (12) which retains data to be analyzed, and an analysis terminal (14). The data analysis server (11) sends to the data retention system (12), according to an analysis demand from the analysis terminal (14), an analysis request of the data based on a requirement to be satisfied by analysis of the data, and sends to the analysis terminal (14) an analysis result of the data based on the requirement received from the data retention system (12). The data retention system (12) analyzes the data based on the requirement according to the analysis request and sends an analysis result to the analysis terminal (14).Type: ApplicationFiled: December 4, 2020Publication date: December 1, 2022Inventors: Yoko KUMAGAI, Tadashi KAJI, Shigeyuki TANI, Hiroki UCHIYAMA, Anirban BASU, Chiaki OTAHARA
-
Publication number: 20210326315Abstract: Provided is an information recommendation system that includes a trust management framework that generates alternatives of information that has a history and is evaluated, based on a perspective about adoption criteria for evaluation of the information input to search the information, and criteria for ranking the information, being input to search the information.Type: ApplicationFiled: March 26, 2021Publication date: October 21, 2021Inventors: Anirban BASU, Yoko KUMAGAI
-
Patent number: 8516245Abstract: A validation authority for certificates searches for and verifies paths and certificate revocation lists periodically, and classifies the paths into valid paths and invalid paths in accordance with the results of the validations, so as to register the paths in databases beforehand. Besides, in a case where a request for authenticating the validity of a certificate has been received from an end entity, the validation authority judges the validity of the public key certificate by checking in which of the valid-path database and the invalid-path database a path corresponding to the request is registered. On the other hand, in a case where the path corresponding to the validity authentication request is not registered in either of the databases, the validity of the public key certificate is authenticated by performing path search and validation anew.Type: GrantFiled: June 19, 2009Date of Patent: August 20, 2013Assignee: Hitachi, Ltd.Inventors: Yoko Kumagai, Takahiro Fujishiro, Tadashi Kaji, Shingo Hane, Hitoshi Shimonosono
-
Publication number: 20090259842Abstract: A validation authority for certificates searches for and verifies paths and certificate revocation lists periodically, and classifies the paths into valid paths and invalid paths in accordance with the results of the validations, so as to register the paths in databases beforehand. Besides, in a case where a request for authenticating the validity of a certificate has been received from an end entity, the validation authority judges the validity of the public key certificate by checking in which of the valid-path database and the invalid-path database a path corresponding to the request is registered. On the other hand, in a case where the path corresponding to the validity authentication request is not registered in either of the databases, the validity of the public key certificate is authenticated by performing path search and validation anew.Type: ApplicationFiled: June 19, 2009Publication date: October 15, 2009Applicants: Hitachi, LtdInventors: Yoko KUMAGAI, Takahiro Fujishiro, Tadashi Kaji, Shingo Hane, Hitoshi Shimonosono
-
Patent number: 7558952Abstract: A validation authority for certificates searches for and verifies paths and certificate revocation lists periodically, and classifies the paths into valid paths and invalid paths in accordance with the results of the validations, so as to register the paths in databases beforehand. Besides, in a case where a request for authenticating the validity of a certificate has been received from an end entity, the validation authority judges the validity of the public key certificate by checking in which of the valid-path database and the invalid-path database a path corresponding to the request is registered. On the other hand, in a case where the path corresponding to the validity authentication request is not registered in either of the databases, the validity of the public key certificate is authenticated by performing path search and validation anew.Type: GrantFiled: March 1, 2004Date of Patent: July 7, 2009Assignee: Hitachi, Ltd.Inventors: Yoko Kumagai, Takahiro Fujishiro, Tadashi Kaji, Shingo Hane, Hitoshi Shimonosono
-
Patent number: 7533269Abstract: In response to a sign request including a digital document from a document-creating device 10, a digital-signed-document exchange supporting server 30 canonicalizes the digital document, calculates a digest value thereof, and returns the digest value to the document creating device. When the document-creating device transmits a digital sign created by encrypting the digest value to the digital-signed-digital document exchange-supporting server 30, the server 30 creates a digital-signed document from the digital sign and the digital document, and returns the document to the document-creating device. On the other hand, in response to a validation request including a digital-signed-digital document and a public key from a sign validating device 20, the server 30 compares a value resulting from the decryption of the digital sign with the public key and a digest value of the digital document canonicalized and returns the result to the sign validating device.Type: GrantFiled: January 31, 2005Date of Patent: May 12, 2009Assignee: Hitachi, Ltd.Inventors: Yoko Kumagai, Takahiro Fujishiro, Tadashi Kaji, Shingo Hane, Hitoshi Shimonosono
-
Patent number: 7409553Abstract: A public key certificate generation method includes the steps of: sending a certificate issuing request including a registration contents of a public key certificate and an information content guaranteed by the registration authority, to the issuing authority in a registration authority and generating a public key certificate including the registration contents described in the certificate issuing request the information guaranteed by the registration authority issuing contents issued by the issuing authority, and a signature to the issuing contents in the issuing authority.Type: GrantFiled: February 19, 2002Date of Patent: August 5, 2008Assignee: Hitachi, Ltd.Inventors: Yoko Kumagai, Takahiro Fujishiro, Satoru Tezuka, Takanobu Oikawa, Izumi Anayama
-
Patent number: 7409551Abstract: A time period which is expended since a request for the authentication of the validity of a public key certificate till the authentication of the validity, is shortened. A certificate validity authentication center VC periodically searches for and verifies paths which extend from a bridge certification authority CAbridge to individual terminal admitting certification authorities CA, and it registers the paths whose verifications have held good, in a path database in association with the respective terminal admitting certification authorities CA.Type: GrantFiled: June 14, 2006Date of Patent: August 5, 2008Assignee: Hitachi, Ltd.Inventors: Takahiro Fujishiro, Satoru Tezuka, Yoko Kumagai, Tomoharu Morio, Yutaka Miyazaki
-
Patent number: 7392380Abstract: If a CRL is cached for an increased speed of a certificate validation process, when a certification authority issues a CRL in an urgent situation, the accuracy of the certificate validation result cannot be secured because the cached CRL is not the latest one. This problem is solved as follows. When it issues a CRL, the certification authority sends a CRL issuance notification to certificate validation servers. The certificate validation servers that received the CRL issuance notification cache the latest CRL. Thus, the accuracy of the certificate validation result can be secured.Type: GrantFiled: June 9, 2003Date of Patent: June 24, 2008Assignee: Hitachi, Ltd.Inventors: Tadashi Kaji, Takahiro Fujishiro, Yoko Kumagai, Shingo Hane, Hiromi Nagano
-
Publication number: 20060242413Abstract: A time period which is expended since a request for the authentication of the validity of a public key certificate till the authentication of the validity, is shortened. A certificate validity authentication center VC periodically searches for and verifies paths which extend from a bridge certification authority CAbridge to individual terminal admitting certification authorities CA, and it registers the paths whose verifications have held good, in a path database in association with the respective terminal admitting certification authorities CA.Type: ApplicationFiled: June 14, 2006Publication date: October 26, 2006Inventors: Takahiro Fujishiro, Satoru Tezuka, Yoko Kumagai, Tomoharu Morio, Yutaka Miyazaki
-
Publication number: 20060168650Abstract: In response to a sign request including a digital document from a document-creating device 10, a digital-signed-document exchange supporting server 30 canonicalizes the digital document, calculates a digest value thereof and returns the digest value to the document creating device. When the document-creating device transmits a digital sign created by encrypting the digest value to the digital-signed-digital document exchange-supporting server 30, the digital-signed-digital document exchange-supporting server 30 creates a digital-signed document from the digital sign and the digital document and returns the document to the document-creating device.Type: ApplicationFiled: January 31, 2005Publication date: July 27, 2006Inventors: Yoko Kumagai, Takahiro Fujishiro, Tadashi Kaji, Shingo Hane, Hitoshi Shimonosono
-
Patent number: 7080251Abstract: A time period which is expended since a request for the authentication of the validity of a public key certificate till the authentication of the validity, is shortened. A certificate validity authentication center VC periodically searches for and verifies paths which extend from a bridge certification authority CAbridge to individual terminal admitting certification authorities CA, and it registers the paths whose verifications have held good, in a path database in association with the respective terminal admitting certification authorities CA.Type: GrantFiled: August 30, 2001Date of Patent: July 18, 2006Assignee: Hitachi, Ltd.Inventors: Takahiro Fujishiro, Satoru Tezuka, Yoko Kumagai, Tomoharu Morio, Yutaka Miyazaki
-
Publication number: 20050081037Abstract: A validation authority for certificates searches for and verifies paths and certificate revocation lists periodically, and classifies the paths into valid paths and invalid paths in accordance with the results of the validations, so as to register the paths in databases beforehand. Besides, in a case where a request for authenticating the validity of a certificate has been received from an end entity, the validation authority judges the validity of the public key certificate by checking in which of the valid-path database and the invalid-path database a path corresponding to the request is registered. On the other hand, in a case where the path corresponding to the validity authentication request is not registered in either of the databases, the validity of the public key certificate is authenticated by performing path search and validation anew.Type: ApplicationFiled: March 1, 2004Publication date: April 14, 2005Inventors: Yoko Kumagai, Takahiro Fujishiro, Tadashi Kaji, Shingo Hane, Hitoshi Shimonosono
-
Publication number: 20040255116Abstract: The present invention provides a technology for verifying the validity of an electronic document by using a signature affixed to the electronic document at the time of its creation even if the electronic document is partially rendered private at the time of its disclosure. An target electronic document is divided into two or more partial documents having an arbitrary or fixed length. This division is effected by using a tag of XML or other markup language so as to provide versatility or by adding a dedicated delimiter for division. The system has a signature function. The signature function uses a signature technique for generating the information for verifying the validity of each of the partial documents, and validating a signature affixed to the electronic document to confirm the validity of the whole electronic document by affixing a signature to the aggregate of the generated validity confirmation information.Type: ApplicationFiled: August 20, 2003Publication date: December 16, 2004Inventors: Shingo Hane, Takahiro Fujishiro, Tadashi Kaji, Yoko Kumagai, Junichi Takeuchi
-
Publication number: 20040111609Abstract: If a CRL is cached for an increased speed of a certificate validation process, when a certification authority issues a CRL in an urgent situation, the accuracy of the certificate validation result cannot be secured because the cached CRL is not the latest one. This problem is solved as follows. When it issues a CRL, the certification authority sends a CRL issuance notification to certificate validation servers. The certificate validation servers that received the CRL issuance notification cache the latest CRL. Thus, the accuracy of the certificate validation result can be secured.Type: ApplicationFiled: June 9, 2003Publication date: June 10, 2004Inventors: Tadashi Kaji, Takahiro Fujishiro, Yoko Kumagai, Shingo Hane, Hiromi Nagano
-
Publication number: 20030097566Abstract: A public key certificate generation method includes the steps of: sending a certificate issuing request including a registration contents of a public key certificate and an information content guaranteed by the registration authority, to the issuing authority in a registration authority and generating a public key certificate including the registration contents described in the certificate issuing request the information guaranteed by the registration authority issuing contents issued by the issuing authority, and a signature to the issuing contents in the issuing authority.Type: ApplicationFiled: February 19, 2002Publication date: May 22, 2003Inventors: Yoko Kumagai, Takahiro Fujishiro, Satoru Tezuka, Takanobu Oikawa, Izumi Anayama
-
Publication number: 20020046340Abstract: A time period which is expended since a request for the authentication of the validity of a public key certificate till the authentication of the validity, is shortened. A certificate validity authentication center VC periodically searches for and verifies paths which extend from a bridge certification authority CAbridge to individual terminal admitting certification authorities CA, and it registers the paths whose verifications have held good, in a path database in association with the respective terminal admitting certification authorities CA.Type: ApplicationFiled: August 30, 2001Publication date: April 18, 2002Inventors: Takahiro Fujishiro, Satoru Tezuka, Yoko Kumagai, Tomoharu Morio, Yutaka Miyazaki