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QC-LDPC 부호의 모든 작은 싸이클을 검출하는 알고리즘
윤대영(Dae-Young Yun),노종선(Jong-Seon No),김재원(Jae-won Kim) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
본 논문에서는 Quasi-Cyclic Low Density Parity Check(QC-LDPC) 부호에서 짧은 cycle 을 검출하는 알고리즘을 제시한다. 2-cycle 을 검출하는 알고리즘은 parity check matrix(PCM)의 개의 row 중에서 개를 골라 sub matrix를 구성하고, 그 중 column weight 가 2 이상인 column 에서 cycle traveling 을 수행한다. QC-LDPC 의 특성을 이용하여 짧은 길이 을 갖는 base matrix 를 이용하여 -lifting 한 길이 의 전체 QC-LDPC 부호 속 cycle 을 구하며, (n<sup>g</sup>)의 복잡도를 보인다. 해당 알고리즘을 통해 cycle 의 개수 뿐만 아니라, 위치 및 경로까지 검출할 수 있다. 본 연구에서는 길이 400 이하의 QC base matrix 에서 길이 12 이하의 cycle 을 모두 검출해 보았다.
양자화 LDPC 복호기를 위한 진보한 Threshold Min-Sum Algorithm
윤대영(Dae-Young Yun),노종선(Jong-Seon No) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
본 논문에서는 오류 마루 현상에 강건한 Threshold Min-Sum Algorithm(TMSA)에 Waterfall 영역의 성능을 끌어올리는 Conditional Correction(CC) 기법을 결합하여 두 영역에서 모두 성능이 좋은 진보한 MSA 를 제시한다. 802.16e 포표준 (24, 12) 기본 행렬을 z=48 로 lifting 한 (1152, 596) LDPC 부호에 대하여 MSA/OMSA/TOMSA/TOMSA+CC 방식으로 복호한 결과, 4 비트 양자화 상황에서 새로운 알고리즘이 Waterfall/Error Floor 영역 모두에서 가장 좋은 성능을 보임을 확인하였다.
정용욱 ( Yong Wook Jung ),오명진 ( Myung Jin Oh ),윤대영 ( Dae Young Yun ),홍영훈 ( Young Hoon Hong ),이충기 ( Choong Ki Lee ) 영남대학교 기초/임상의학연구소 2007 Yeungnam University Journal of Medicine Vol.24 No.2S
Pigmented villonodular synovitis (PVNS) is a benign proliferative disorder of uncertain etiology that affect synovial lined joints. This disesse is an uncommon that usually afflicts the knee joint. Two types of villi are present in this disease, localized form is called ``nodular PVNS`` and non localized form is ``diffuse PVNS``. On microscopy, PVNS is characterized by the presence of hemosiderin-laden, multinucleated, giant cells. But plain radiograph in PVNS shows normal finding exclude effusion, so cannot help diagnosis of PVNS. We experienced a case of a 59-years-old male patient who complained multiple arthralgia, swelling, limit of motion of Lt knee. We gave diagonsis of gout with PVNS by MRI and arthroscopic procedure. So we report this case with review of literature.
대장 선종 환자와 정상인에서 혈중 렙틴 농도와 대장 점막 렙틴 발현과의 상관관계
오장석 ( Jang Seok Oh ),김현희 ( Hyun Hee Kim ),황현식 ( Hyun Sik Hwang ),윤대영 ( Dae Young Yun ),김병석 ( Byung Seok Kim ),이창형 ( Chang Hyeong Lee ),한지민 ( Ji Min Han ),김호각 ( Ho Gak Kim ),정진태 ( Jin Tae Jung ),권중구 ( 대한소화기학회 2014 대한소화기학회지 Vol.63 No.6
Background/Aims: Obesity increases the risk of colorectal cancer and adenomatous polyp, and one of the underlying mechanisms of this increase is considered to be due to the growth promoting effects of adipokines, such as leptin. In order to investigatethis finding, leptin expression in the colonic tissue and blood leptin concentration of the colonic adenoma patients were compared to those of the control group. Methods: Colonic adenoma tissues were obtained by polypectomy (n=60). In these patients, normal colonic mucosa at remote areas from the polyp was also obtained and blood samples were collected as well. Age and sex matched control subjects were selected among those who showed normal colonic mucosa in health screening colonoscopy (n=60).Results: There was no significant difference in serum leptin concentration between the colonic adenoma patients and control subjects. Leptin expression was noted in 43.3% of the colonic adenomas, but only in 6.7% of normal colonic mucosa fromthe control subjects (p<0.01). There were ten cases of concurrent adenocarcinoma in situ in adenoma patients, eight cases of which expressed leptin (p=0.01). In adenoma group, leptin expression rate was significantly high in larger adenomas and in obese patients (p<0.05). However, there was no statistically significant relationship between leptin expression in colonicmucosa and serum leptin level. Conclusions: Leptin expression was more frequently observed in colonic adenomas, especially in larger adenomas associated with adenocarcinoma in situ, but blood leptin level was not related to tissue leptin expression. Leptin expression was more frequently observed in obese patients from the adenoma group. Therefore, leptin may play an important role in colonic tumori-genesis and progression, especially in obese patient. (Korean J Gastroenterol 2014;63:354-360)
전신성 홍반성 루푸스에서 고용량 경정맥 당질코르티코이드로 치료된 단백질 소실성 장질환 1예
이규형 ( Kyu Hyung Lee ),권창모 ( Chang Mo Kwon ),김현도 ( Hyun Do Kim ),윤대영 ( Dae Young Yun ),이재웅 ( Jae Yoong Lee ),홍영훈 ( Yeong Hoon Hong ),이충기 ( Choong Ki Lee ) 영남대학교 기초/임상의학연구소 2005 Yeungnam University Journal of Medicine Vol.22 No.2
Generalized edema and hypoalbuminemia are relatively common presenting manifestations in many clinical situations. The differential diagnosis of hypoalbuminemia include: Kwashiorkor, synthetic dysfunction of the liver, and excessive protein loss as in nephrotic syndrome. In systemic lupus erythematosus (SLE), hypoalbuminemia and generalized edema are most commonly due to protein loss associated with lupus nephritis; gastrointestinal involvement is uncommon, and therefore protein loss through the gastrointestinal tract is quite rare. We report a case of a protein losing enteropathy (PLE) associated with SLE. The patient was referred to our hospital for generalized edema, arthralgia and facial rash. After clinical evaluation, the patient met the criteria for the SLE diagnosis; hypoalbuminemia with general edema was consistent with a protein losing enteropathy. After two weeks of therapy with parenteral high dose glucocorticoid, the patients was improved in laboratory findings as well as clinical symptoms.