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Full Duplexing을 위한 RF Front-End System 설계
김용주(Young Joo Kim),서동호(Dongho Seo),이원준(Wonjun Lee),임종식(Jongsik Lim),한상민(Sang-Min Han) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
본 논문은 동일 대역 전이중방식 안테나의 송수신 신호의 격리도를 향상시키기 위한 안테나를 설계한다. 동일 대역 전이중방식 패치 안테나에 대향하는 대향면을 제외한 송신 및 수신 급전선 주변에 일정 간격으로 배치되는 다수의 비아홀을 형성하여, 송수신 신호의 격리도를 높여 자기간섭 신호를 최소화하는 동일 대역 전이중방식 안테나이다.
김용주 ( Yong-joo Kim ),최용 ( Yong Choi ),김영근 ( Young-keun Kim ),최일수 ( Il-su Choi ),김태영 ( Tae-young Kim ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.2
Optimal design of powertrain of agricultural tractor is important to ensure product durability and reliability. This study measured a load of the powertrain of agricultural tractor during a rotary tillage and analyzed the stress and safety factor of powertrain using analysis software based on ISO 6336 standards. The measured torque data in the agricultural field generally fluctuates. Therefore, simplifying the measured torque data required to determine the stress and safety factor of powertrain. To analyze the load data, the equivalent torque was determined. The compound planetary systems for agricultural tractor was simulated at the rated torque, at maximum torque and equivalent torque condition. Finally, the stress and safety factor were compared under the three conditions. The result shows that the stress and safety factor of each condition showed significant difference. Therefore, when the powertrain of agricultural tractor is designed, it is necessary to consider the load condition according to field operation.
이층 기판 결함접지구조 전송전로를 이용한 소형 저역통과여파기 설계
김용주(Young Joo Kim),서동호(Dongho Seo),윤원상(Won-Sang Yoon),한상민(Sang-Min Han) 대한전기학회 2020 전기학회논문지 Vol.69 No.12
A compact double-layered DGS lowpass filter is proposed with miniaturized DGSs. The double-layered structure is composed of a conventional DGS microstrip line attaching a thick dielectric slab of a high dielectric constant, which makes a higher effective dielectric constant on a DGS pattern. The compact DGS lowpass filter is designed with miniaturized DGSs. The equivalent circuit is extracted from single DGSs on double-layered lines. The fifth-state lowpass filter with three DGSs has been implemented and compared with theoretical circuit models and electromagnetic simulated results. From the experimental results, the proposed double-layered DGS lowpass filter has shown good agreements to the design analysis and compared with a conventional DGS filter without an additional lower dielectric substrate to verify miniaturization.
김용주(Young Joo Kim),문한림(Han Lim Moon),김병욱(Byung Wook Kim),김희열(Hee Yeol Kim),방승호(Seung Ho Bang),안중현(Joong Hyun Ahn),한상국(Sang Kook Han),강진형(Jin Hyung Kang),홍영선(Young Seon Hong),김훈교(Hoon Kyo Kim),이경식(Kyun 대한내과학회 1995 대한내과학회지 Vol.48 No.5
Acute leukemia after chemotherapy and/or radio- therapy for malignant disorder is called secondary acute leukemia(SAL) or therapy related leukemia. Typically, SAL is preceded by a prodrome phase or myelodysplastic syndrome (MDS) resulting in trilineage dysplasia manifested by pancytopenia, associated with cytogenetic abnormalities involving chromosome 5 and 7, and carries a poor prognosis. Although FAB M3 type(acute promyelocytic leukemia) of SAL had been rarely reported, recently there was a report on 16 cases of therapy-related acute promyelocytic leukemia. We hereby report a case of secondary acute promyelocytic leukemia after treatment of advanced breast cancer. A 62-year-old woman was admitted because of pancytopenia, purpura of legs and gingival bleeding. Since six years before admission when she was diagnosed as infiltrating ductal carcinoma of breast with metastases to lung, She had received CMF(cyclophosphamide, methotrexate, 5-fluorouracil) chemotherapy and radiotherapy, and underwent modified radical mastectomy after complete disappearance of pulmonary nodules, She had received further chemotherapy with cumulative doses of chemotherapeutic agents as following; 21g of cyclophosphamide, 410mg of doxorubicin, 21g of 5-fluorouracil, and 600 mg of methotrexate. Radiation doses to chest wall, axilla and supraclavicular area were 2880 to 3400cGy. The examination of bone marrow aspiration and biopsy showed acute promylocytic leukemia(FAR M3). Cytogenetic analysis of peripheral blood demonstrated 46XX[1]/46XX, t(7; 11) (p15; p15) [12]. The patient did not achieved a complete remission despite retinoic acid therapy and intensive chemotherapy with Ara-C and AMSA, and died 10 months after diagnosis of acute promyelocytic leukemia.