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임우희,김수완,Lim, Woo Hee,Kim, Su Wan 제주대학교 의과학연구소 2020 The Journal of Medicine and Life Science Vol.17 No.1
The prevalence of pulmonary pargonimiasis in Korea has been steadily decreasing due to develop of the public health, and there have been few clinical cases of paragonimiasis infections, especially in pneumothorax. A 22-year-old man referred to emergency department for dyspnea and chest pain. The right lung was totally collapsed on a chest X-ray. We emergently performed a closed thoracostomy with a 28-Fr chest tube. However, the air leak from the chest tube persisted for three days after the closed thoracostomy. A chest computed tomography showed multiple subpleural consolidative nodular lesions and mixed ground-glass attenuation nodules. We potentially suspected a secondary pneumothorax resulting from pulmonary paragonimiasis infection because the patient was a Chinese man who was working at a Korean restaurant. We decided to perform a medical treatment instead of pulmonary wedge resections. The air leak was discontinued three days after the prescription of praziquantel. The patient was discharged nine days after the admission. We suggest that anti-parasitic drugs are very effective in the secondary pneumothorax resulting from paragonimiasis.
Flat Panel Phased Array Antenna for 2-D Wide-Angle Beam Steering
Ye-Bon Kim(김예본),Woo-Hee Lim(임우희),Seung-Won Oh(오승원),Junhyuk Cho(조준혁),Han Lim Lee(이한림) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
This paper proposes a new refractive dielectric lay-up antenna technology which generates 2-dimensionally (E- and H-planes) wide beamwidth. The proposed antenna is a compact planar structure and thus can be effectively used for mmWave/sub-THz flat panel phased array with 2-D wide scan angles. To verify the proposed antenna, both single and 4x4 array structures in E- and H- planes were fabricated and compared with the conventional patch antenna at 28 GHz. The array antennas are integrated with a 4-channel beamforming IC to perform beam scanning. The proposed 4x4 array antenna measured scan angle in E-plane and Hplane were 156° and 156° whereas the conventional patch antenna showed the measured scan angle in E- and H- planes of 90° and 86° at 28 GHz. Lastly, high speed modulation test is also performed by comparing general patch and proposed 4x4 array antennas. Error Vector Magnitude (EVM) characteristics of the 64-QAM signal are verified according to the transmission position with beamforming performance.