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다중 VBR 소스를 갖는 TCP over UBR-EPD의 특성
이진우,김진태,유영길,Lee, Jin-Woo,Kim, Jin-Tae,Yoo, Young-Kil 대한전자공학회 1999 電子工學會論文誌-T Vol.t36 No.4
The Asynchronous Transfer Mode(ATM) networks are being adopted as backbones over various parts of Internet. TCP is one of the most widespread transport protocols and can be used with ATM. But, TCP shows poor end-to-end performance on ATM networks. Effective throughput of TCP over ATM can be quite low when cells are dropped at the congested ATM switch. As congested link transmits cells from corrupted packets, it wastes bandwidth and throughput becomes low. This paper examines the behavior of TCP over ATM-UBR using EPD switch in a broadband environment. As threshold value closes to the buffer size, the buffer can be used more efficiently, but more drops and retransmission occur. If the threshold value is much less than buffer size, efficiency becomes low, but few drops can be happen. Therefore, the decision of threshold value becomes important factor.
나선형 인덕터의 디임베드 검증을 통한 CMOS LNA 설계 및 제작
李?瑩(Han-Young Lee),劉英吉(Young-Kil Yoo) 대한전기학회 2008 전기학회논문지 Vol.57 No.12
This paper examined the simulation results after applying not only spiral inductor's 3D EM simulation but also de-embedding technique to reduce the pad's RF effects. When calculating standard deviation with measurement results not only the gain at 0.5㎓~4㎓ but also noise figure at 1.8㎓~4㎓, the simulation results includes de-embedded inductor model improved gain deviation by 0.171 and noise figure deviation by 0.151 than the results from simulation with foundry inductor equivalent circuit models.
원발성 종격동 정상피종(Anaplastic Subtype) 1 예
이영욱,김효진,이현제,박용구,유영길,장대환,오춘수,승기배 대한내과학회 1987 대한내과학회지 Vol.33 No.6
Seminomatous germ cell tumors can arise as primary malignancies in the mediastinum without involving the testis. It is identical to testicular seminoma histologically. Currently, testicular seminomas are classified into three subtypes; typical or classical seminoma, anaplastic seminoma, and spermatocytic seminoma. We experienced one case of primary mediastinal seminoma. He was 25 year old male, and complained of a growing anterior chest wall mass for 1 month prior to admission. The patient underwent open thoracotomy. But we coudn't resect the mass completely, because of tumor encroachment on adjacent mediastinal structures. Excisional biopsy was interpreted as anaplastic seminoma. He began combination chemotherapy and radiation therapy involving the whole mediastinum and lower neck. The patient had no response to therapy and died of metastatic tumor 4 months after admission.
관장으로 유발된 궤양을 동반한 장염 (Enema-induced colitis) 1예
장린,민영일,신현호,유영길,방익수,박충기 대한소화기내시경학회 1984 Clinical Endoscopy Vol.4 No.1
Enemas are sometimes used in hospital and domicilliary practice and occasionally by patients themselves without a valid indication. The present repart is one in which enernas were done for 3 months by a patient himself to treat his hemorrhoid and resulted in severe inflamimatory change with large-siaed illdefined shallow ulceration in rectum and sigmoid colon. This patient, a 53 year old male, entered the hospital with the complaint of diarrhea with passage of bloody muct.. Colonoscopic examination revealed severe inflammatory change, friable mucosa and several relatively large-sized ill-defined shallow ulceration in rectum and sigmoid colon. A biopsy was performed and microscapic examination revealed intense infiltrates and plasma cells and crypt abscess with decreased goblet cells in the lamiina propria. The submucosa showed edema with infiltrates of chronic inflammatory cells and neutrophils. Conservative treatment with discontinue of enemas and fluid supply was performed. And his symptoms were improved. After second week, follow-up colonoscopy revealed inflammatory changes were improved.