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Diplexer 구조를 이용한 Dual Band 방향성 커플러
김기중,박자영,정영학,배효근,김남흥,김학선,Kim Ki-Joong,Park Ja-Young,Jeong Young-Hak,Bae Hyo-Gun,Kim Nam-Heung,Kim Hak-Sun 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.8
본 논문은 glass 기판 위에 RE IPD(Integrated Passive Device) 기술을 이용하여 dual band 방향성 커플러의 새로운 설계와 구현을 하였으며, 이러한 구조는 전력 증폭기의 출력부에 closed loop 전력 제 어용 GSM/GPRS cellular phones에 적용할 수 있다. 커플러는 방향성 향상을 위하여 보상 capacitor를 이용하였으며, 상호 밴드의 간섭을 최소화하기 위하여 새로운 방법의 필터링 구조(diplexer)를 갖는 커플러를 구현하였다. In this paper, a novel design and implementation of a dual-band directional coupler based on RF IPD(Integrated Passive Device)-on-glass technology is proposed, which can be adopted in GSM/GPRS cellular phones for closed loop power control at the output of the power amplifier. The proposed coupler has a compensation capacitor to improve the directivity, and was designed using a new diplexing structure to minimize the cross-band isolation.
김양식,정재혁,김호규,원영준,최성대,서영배,배효근,조창호,한승묵 대한소화기내시경학회 1998 Clinical Endoscopy Vol.18 No.6
Blood-borne metastatic involvement of the gastric mucosa as a result of cancer is a rare occurrence. The tumors which were most commonly reported to metastasize to the stomach include melanoma, breast carcinoma, and lung carcinoma. Some reports document that large cell carcinoma and squamous cell carcinoma of the lungs have a higher pre- dilection for gastrointestinal tract metastases. Upper gastrointestinal endoscopic findings of metastatic lesions may vary but often produce a characteristic single or multiple bulls eye or target lesion. Therefore, whenever single or multiple target lesions are seen in the stomach on upper gastrointestinal endoscopy or barium study, the examination should include careful radiographic evaluation of the chest. Moreover, when the patient is known to have lung cancer, metastatic disease should be suspected. With a correct diagnosis and proper treatment, relief of symptoms and prolongation of life can sometimes be achieved, A case in reported involving squamous cell lung cancer with stomach metastasis in a 73 year-old woman. The patient was diagnosed by bronchoscopy, upper gastrointestinal endoscopy, chest CT, and abdominal CT. The chest and abdominal CT revealed a poorly marginated, lobulated, and 4 x 3 cm sized mass lesion in the right lower lobe causing obstruction of right lower lobe bronchus with invasion to the left atrium. right inferior pulmonary vein, and superior vena cava. Mediastimal lymph node enlargement and liver metastasis was also detected. Upper gastrointestinal endoscopy showed two $quot;bulls eye$quot; lesions with different sizes and two nodules without tip ulceration.