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커플러와 반파장 루프 패턴을 활용한 광대역 샤크핀 안테나 설계
이혁,정원선,김재현,최재훈 한국전자파학회 2023 한국전자파학회논문지 Vol.34 No.4
This study proposes a design of a wideband shark-fin antenna that operates in the sub-6 GHz band for 5G communication. A wideband shark-fin antenna is a multiple-input-multiple-output antenna consisting of two antenna elements. For operation in the 4G and 5G operation bands, wideband characteristics were implemented using a coupler and a half-lambda loop pattern. The manufactured wideband shark-fin antenna satisfied the condition VSWR<3.5:1 in the 4G and 5G operating bands. The average gains over the operating bandwidth were greater than −1.97 dBi, indicating that the shark-fin antenna had excellent radiation characteristics.
이혁,김영통,서광원,김서희,신형철,한건수,김일영,이혜경,Lee, Hyeok,Kim, Young-Tong,Seo, Kwang-Won,Kim, Seo-Hee,Shin, Hyeong-Cheol,Han, Kun-Soo,Kim, Il-Young,Lee, Hye-Kyung 대한영상의학회 1997 대한영상의학회지 Vol.37 No.6
Purpose:To analyse the ultrasonographic findings normal thymus in infants and determine the pathologic findings. Materials and Methods:Forty two infants without a history of chronic disease, tumor or steroid therapy were scanned in the axial planes with a 7.0 MHz sector transducer. Bilaterality, homogeneity, and the types, namely bilobate, quadragular or triangular. The intensities of thymic echogenicity were compared with those of the liver and spleen under the same conditions(time-gain compensation, depth and gain). Results:Bilaterality was seen in 36 cases, homogeneity in 35, homogeneity and bilaterality in 29, inhomogeneity and bilaterality in seven, and homogeneity and unilaterality in six. No case showedinhomogeneity and unilaterality. The shape was bilobate in 23 case, quadrangular in 13 and triangular in six, while the other border was convex in 29 cases and straight in 13. In no case wasechogenicity of the thymus greater than that of the liver or spleen. Transverse diameters were echogenicity of the thymus greater than that of the liver or spleen. Transverse diameters were 21-47mm(mean, 37.0mm;SD, 9.4mm) and depths were 10-37.5mm(mean, 25.8mm;SD, 5.9mm). Conclusion:The usual findings of normal thymus in infants are bilaterality and homogeneity, convex or shaight outer border, and echo intensity less than or equal to that of the liver and spleen. The possibility of thymic pathology is suggested when ultrasonography shows uniaterality, inhomogeneous echogeneity, and echogenicity greater than that of the liver and spleen.
우리나라 조기 위암에 대한 내시경 절제 후 장기적인 임상 결과
이혁,이준행 대한상부위장관ㆍ헬리코박터학회 2016 Korean Journal of Helicobacter Upper Gastrointesti Vol.16 No.1
Endoscopic resection is accepted as the standard treatment for early gastric cancer (EGC) without lymph-node metastasis. The indications for endoscopic submucosal dissection (ESD) have been expanded from the standard indications of endoscopic mu- cosal resection. Recently, clinical data supporting further expansion of ESD have been accumulating. In Korea, recent large scale studies have reported favorable long-term outcomes for EGCs that meet the expanded indications, with 5-year overall survival rates similar to those of EGCs meeting the absolute indication. Additionally, several reports on comparison of long-term outcome after endoscopic resection versus surgical treatment have been published. This review elucidates the feasibility of endoscopic resection for EGC, based on evidence from long-term outcome in Korea. There are still some limitations associated with retrospective analy- ses and subsequent biased analysis of outcome based on the post-treatment diagnostic groups and problematic follow-up loss. (Korean J Helicoba cter Up Gastrointest Res 2016;16:1-5)