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公开(公告)号：US20230157895A1
公开(公告)日：2023-05-25
申请号：US17773212
申请日：2021-06-04
发明人： Young June MOON , Hyung Keun CHUNG
IPC分类号： A61F11/08 , G10K11/175
CPC分类号： A61F11/08 , G10K11/175 , G10K2210/3214
摘要： Proposed is an earplug that can effectively reduce high-frequency noise using a metasurface. The high-frequency noise filtering earplug using a metasurface according to an embodiment of the present disclosure may include an eartip with an internal passage, an interference attenuation module having a damping passage for reducing noise and a first reflective cavity that is connected to the damping passage and reflects incident sound waves and transmits the sound waves to the damping passage, and a connecting tube installed between the eartip and the interference attenuation module to connect the internal passage and the damping passage to each other.
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公开(公告)号：US20180184626A1
公开(公告)日：2018-07-05
申请号：US15738273
申请日：2017-01-25
发明人： Young June MOON , Dae Han KIM
CPC分类号： A01K63/042 , A01K63/04 , B01F3/04 , B01F3/04531 , B01F7/00 , B01F7/00341 , B01F7/06 , B01F2215/0052 , C02F1/40 , C02F1/74 , C02F3/12 , C02F3/20 , C02F7/00 , C02F2103/20 , F04D7/045 , F04D31/00
摘要： A contra-rotating multi-layer propeller unit for multi-phase flow according to an exemplary embodiment of the present disclosure includes: a shaft part; a front propeller and a rear propeller connected to the shaft part; an air collection part including a predetermined space therein and the shaft part positioned in the internal space; and an air supply pipe configured to supply air into the air collection part, and a rear propeller blade includes a two-phase blade connected to a rear propeller hub, a layer structure of which an inner surface is connected to an end portion of the two-phase blade, and a single-phase blade positioned at a location corresponding to the two-phase blade on an outer surface of the layer structure.
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