Patents by Inventor Kyoung-Hwang Lee
Kyoung-Hwang Lee 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: 10424223Abstract: Provided are a braille actuator and a braille outputting device using the same. The braille actuator includes an electromagnet, a rotation member, and a braille protrusion. With this configuration, the actuator applies a current to the electromagnet to allow the electromagnet to exert a repulsive force or attractive force on the permanent magnet of the rotation member, so that the rotation member is rotated, and due to the rotation of the rotation member, the upper surface of the rotation member allows the lower surface of the braille protrusion to be moved upward, and the braille protrusion is protruded. After that, even though the supplying of the current to the electromagnet is blocked, the braille protrusion is supported by the rotation member, and thus, the output state is maintained, so that it is possible to greatly reduce power consumption for output of braille.Type: GrantFiled: March 22, 2016Date of Patent: September 24, 2019Assignee: OHFATECH, INCInventors: Kyoung Hwang Lee, Jae Ryun Cho, Min Sung Son, Hang Sok Kim
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Publication number: 20180357924Abstract: Provided are a braille actuator and a braille outputting device using the same. The braille actuator includes an electromagnet, a rotation member, and a braille protrusion. With this configuration, the actuator applies a current to the electromagnet to allow the electromagnet to exert a repulsive force or attractive force on the permanent magnet of the rotation member, so that the rotation member is rotated, and due to the rotation of the rotation member, the upper surface of the rotation member allows the lower surface of the braille protrusion to be moved upward, and the braille protrusion is protruded. After that, even though the supplying of the current to the electromagnet is blocked, the braille protrusion is supported by the rotation member, and thus, the output state is maintained, so that it is possible to greatly reduce power consumption for output of braille.Type: ApplicationFiled: March 22, 2016Publication date: December 13, 2018Applicant: OHFATECH, INCInventors: Kyoung Hwang LEE, Jae Ryun CHO, Min Sung SON, Hang Sok KIM
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Patent number: 10074858Abstract: A fuel cell separator, a fuel cell stack having the fuel cell separator, and a reactant gas control method of the fuel cell stack are provided. That is, even when the fuel cell stack operates under the low load operation condition, a reactant gas is supplied to the reactant gas passages of the fuel cell separator, and thus, the length of the passage can be shortened by 50% as compared with the prior art having only one reactant gas passage. Therefore, the reactant gas can be effectively supplied without experiencing pressure loss. Further, in the high load operation of the fuel cell stack, the reactant gas is introduced into the first reactant gas passage of the fuel cell separator and utilized in half of the whole electrode area. Subsequently, the reactant gas is introduced into the second reactant gas passage and utilized in the remaining half of the electrode area.Type: GrantFiled: March 11, 2016Date of Patent: September 11, 2018Assignee: DOOSAN CORPORATIONInventors: Sung-Jin Oh, Kyoung-Hwang Lee, Seung-Ho Baek, Sung-Hoon Lee, Il-Tae Park, Byung-Sun Hong, Mee-Nam Shinn
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Patent number: 9876237Abstract: A fuel cell separator, a fuel cell stack having the fuel cell separator, and a reactant gas control method of the fuel cell stack are provided. That is, even when the fuel cell stack operates under the low load operation condition, a reactant gas is supplied to the reactant gas passages of the fuel cell separator, and thus, the length of the passage can be shortened by 50% as compared with the prior art having only one reactant gas passage. Therefore, the reactant gas can be effectively supplied without experiencing pressure loss. Further, in the high load operation of the fuel cell stack, the reactant gas is introduced into the first reactant gas passage of the fuel cell separator and utilized in half of the whole electrode area. Subsequently, the reactant gas is introduced into the second reactant gas passage and utilized in the remaining half of the electrode area.Type: GrantFiled: March 11, 2016Date of Patent: January 23, 2018Assignee: DOOSAN CORPORATIONInventors: Sung-Jin Oh, Kyoung-Hwang Lee, Seung-Ho Baek, Sung-Hoon Lee, Il-Tae Park, Byung-Sun Hong, Mee-Nam Shinn
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Publication number: 20160254552Abstract: A fuel cell separator, a fuel cell stack having the fuel cell separator, and a reactant gas control method of the fuel cell stack are provided. That is, even when the fuel cell stack operates under the low load operation condition, a reactant gas is supplied to the reactant gas passages of the fuel cell separator, and thus, the length of the passage can be shortened by 50% as compared with the prior art having only one reactant gas passage. Therefore, the reactant gas can be effectively supplied without experiencing pressure loss. Further, in the high load operation of the fuel cell stack, the reactant gas is introduced into the first reactant gas passage of the fuel cell separator and utilized in half of the whole electrode area. Subsequently, the reactant gas is introduced into the second reactant gas passage and utilized in the remaining half of the electrode area.Type: ApplicationFiled: March 11, 2016Publication date: September 1, 2016Inventors: Sung-Jin OH, Kyoung-Hwang LEE, Seung-Ho BAEK, Sung-Hoon LEE, Il-Tae PARK, Byung-Sun HONG, Mee-Nam SHINN
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Publication number: 20160197361Abstract: A fuel cell separator, a fuel cell stack having the fuel cell separator, and a reactant gas control method of the fuel cell stack are provided. That is, even when the fuel cell stack operates under the low load operation condition, a reactant gas is supplied to the reactant gas passages of the fuel cell separator, and thus, the length of the passage can be shortened by 50% as compared with the prior art having only one reactant gas passage. Therefore, the reactant gas can be effectively supplied without experiencing pressure loss. Further, in the high load operation of the fuel cell stack, the reactant gas is introduced into the first reactant gas passage of the fuel cell separator and utilized in half of the whole electrode area. Subsequently, the reactant gas is introduced into the second reactant gas passage and utilized in the remaining half of the electrode area.Type: ApplicationFiled: March 11, 2016Publication date: July 7, 2016Inventors: Sung-Jin OH, Kyoung-Hwang LEE, Seung-Ho BAEK, Sung-Hoon LEE, II-Tae PARK, Byung-Sun HONG, Mee-Nam SHINN
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Patent number: 9343756Abstract: A fuel cell separator, a fuel cell stack having the fuel cell separator, and a reactant gas control method of the fuel cell stack are provided. That is, even when the fuel cell stack operates under the low load operation condition, a reactant gas is supplied to the reactant gas passages of the fuel cell separator, and thus, the length of the passage can be shortened by 50% as compared with the prior art having only one reactant gas passage. Therefore, the reactant gas can be effectively supplied without experiencing pressure loss. Further, in the high load operation of the fuel cell stack, the reactant gas is introduced into the first reactant gas passage of the fuel cell separator and utilized in half of the whole electrode area. Subsequently, the reactant gas is introduced into the second reactant gas passage and utilized in the remaining half of the electrode area.Type: GrantFiled: May 23, 2007Date of Patent: May 17, 2016Assignee: DOOSAN CORPORATIONInventors: Sung-Jin Oh, Kyoung-Hwang Lee, Seung-Ho Baek, Sung-Hoon Lee, Il-Tae Park, Byung-Sun Hong, Mee-Nam Shinn
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Publication number: 20090169930Abstract: A fuel cell separator, a fuel cell stack having the fuel cell separator, and a reactant gas control method of the fuel cell stack are provided. That is, even when the fuel cell stack operates under the low load operation condition, a reactant gas is supplied to the reactant gas passages of the fuel cell separator, and thus, the length of the passage can be shortened by 50% as compared with the prior art having only one reactant gas passage. Therefore, the reactant gas can be effectively supplied without experiencing pressure loss. Further, in the high load operation of the fuel cell stack, the reactant gas is introduced into the first reactant gas passage of the fuel cell separator and utilized in half of the whole electrode area. Subsequently, the reactant gas is introduced into the second reactant gas passage and utilized in the remaining half of the electrode area.Type: ApplicationFiled: May 23, 2007Publication date: July 2, 2009Applicant: FUELCELL POWER, INCInventors: Sung-Jin Oh, Kyoung-Hwang Lee, Seung-Ho Baek, Sung-Hoon Lee, Il-Tae Park, Byung-Sun Hong, Mee-Nam Shinn