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정송균,김정엽,현기호 영산대학교 2003 영산논총 Vol.11 No.-
In this paper, we reviewed and compared the methods uses the key as watermark and key with watermark. And we found some methods using the key in watermarking on the frequency domain which were robust to arbitrary attack. At first, the image was transformed to frequency domain by DWT(Discrete Wavelet Transform) in the methods uses the key as watermark, and then the watermark was inserted and extracted in the high frequency region on the transformed image. The second one uses the key with watermark transforms the image into frequency domain by DCT(Discrete Cosine Transform) and inserts the watermark on the mid frequency region that is selected by human visual characteristics. This method also inserts and extracts the watermark with minimum effect to the image quality by using multiple thresholds to maximize the image quality. Experimental results shows the second method using the key with watermark has higher PSNR compared to the other method for the watermark extraction.
Griesmer bound의 등호를 만족하는 [2^k-1+k, k, 2^(k-1)+1] 부호의 설계 방법
김정헌,송홍엽 연세대학교 전파통신연구소 2001 電波通信論文誌 Vol.5 No.1
모든□이진 부호는 Griesmer bound □를 만족해야 한다. 본 논문에서는 Griesmer bound의 등호를 만족하는 □부호의 간단한 설계법을 소개하고 Helleseth 부호 관점에서 본 새로운 표현법을 소개한다. Any □binary linear code must satisfy the Griesmer bound □Here, a simple construction of □codes which achieves the equality of the Griesmer bound is introduced and its another description in view of the codes of Helleseth is presented.
절제 불가능한 원발성 간세포암종에 대하여 DC beads(r)를 사용한 반복적인 경동맥 화학색전술 후 간절제술을 시행한 1예
송정엽 ( Jeong-yeop Song ),김영석 ( Young Seok Kim ),이재명 ( Jae Myeong Lee ),진수지 ( Soo Ji Jin ),최규성 ( Kyu Sung Choi,),이윤나 ( Yun Nah Lee ),김상균 ( Sang Gyune Kim ),정승원 ( Sung Won Jeong ),장재영 ( Jae Young Jang ) 대한간암학회 2013 대한간암학회지 Vol.13 No.1
In patients with unresectable hepatocellular carcinoma (HCC) and no anti-cancer treatment, the prognosis is quite poor. But in some cases, repeated sessions of transcatheter arterial chemoembolization (TACE) reduce the tumor size even to resectable, and post-TACE resection may prolong the survival time. We present a case of 50-year-old HBV carrier woman with abdominal distension. The diagnosis was huge HCC with intrahepatic metastasis. Repeated intra-arterial injections of adriamycin mixed lipiodol or DC beads(R) (100-300/300-500/500-700 μm, ⓒBIOCOMPATIBLES UK LTD) were instituted through ten sessions for 13 months. The tumor size became reduced with a partial response after 10th TACE and post-TACE resection was performed. No visible HCCs and decreased tumor markers were noted on the examinations 3 months after the resection.
고분자 전해질막 연료전지(PEMFC) 가스확산층의 이방성에 따른 성능 해석
서정훈(Jeong Hoon Seo),김동규(Dong Kyu Kim),백경돈(Kyung Don Baik),김선엽(Seon Yeop Kim),송한호(Han Ho Song),김민수(Min Soo Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Performance characteristics according to fiber direction of anisotropic Gas Diffusion Layer(GDL) has been numerically investigated. To analyze the characteristics accurately, different GDL properties(as porosity, diffusivity and permeability) under rib/channel by non-uniform compression is defined when mesh grid is generated. Simulation results explain that performances of fuel cell with 90˚ GDL are generally higher than those with 0˚ GDL, because saturation water distribution is lower in 90˚ GDL by higher permeability and porosity compared with 0˚ GDL. The results mean anisotropic characteristics of GDL can play import role in water management and cell performance.