MPEG-II AAC 심리음향 모델에 관한 연구

구대성,김정태,이강현 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.2

Currently, the most important technology is the compression methods in the multimedia society. Audio files are rapidly propagated through internet. MP-3 is offered to CD tone quality in 128Kbps, but 64Kbps below tone quality is abruptly down and high bitrate. On the other hand, MPEG-I1 AAC (Advanced Audio Goding) is not compatible with MPEG-I, but AAC has a high compression ratio 1.4 better than MP-3. Especially, AAC has max 7.1 channel and 96KHz sampling rate. In this paper, the perceptual model is dealt with 44.1KHz sampling rate for SMR(Signa1 to Masking Ratio)

근위부 후하소뇌동맥의 자연박리성 동맥류 1예

구본대,이종호,김상범,이계훈,허경,이병희 대한신경과학회 1999 대한신경과학회지 Vol.17 No.5

烏貝散이 HCI-aspirin 으로 유발된 십이지장궤양에 미치는 조직학적 영향

구세광,이형식,김종대,한상원,김상찬,이재현 慶山大學校 基礎科學硏究所 1999 基礎科學 Vol.3 No.-

오패산이 HCI-aspirin tm으로 유발된 rat 십이지장궤양에 미치는 조직학적 영향을 관찰하기 위하여, 오패산을 1,3 및 5일 동안 경구투여하고 십이지장의 조직학적 변화를 관찰하였던 바 다음과 같은 결과를 얻었다. 실험 전 기간동안 대조군에서는 십이지장 융모의 위축과 붕괴가 관찰되었으며, 조직학적으로는 점막상피의 변성 및 탈락이 관찰되었고 점막고유층에서는 염증세포의 침윤(infilteration)의 소견이 관찰된 반면 오패산 투여군의 투여 1일에서는 대조군과 유사하게 관찰되었으나, 투여 3일후부터 점막상피의 첨부에서 경미한 카타르성 물질이 관찰된 이외에 정상군과 유사한 소견을 나타내었다. 이상에서 오패산이 십이지장궤양의 치유를 촉진시키는 것으로 관찰되었다. In order to study, the histological effects of Opeaesan on the duodenal ulcer induced by HCI-aspirin tm in rate, experiments were done by oral administration and observed histological profiles of the ulcerative lesions. Ulcerative lesions were unmerously detected in control groups especially in pylorus-duodenal junctions. Histologically, very severe injury to duodenal epithelium wer observed in control groups and these injuries were increased with time intervals. But in the Opaesan-administration groups, no gross lesion of ulcer were demonstrated and histologically minor injury to the mucosal epithelium were observed. Among the Opaesan treatment groups, most slight injuries to duodenal mucosa were detected in 5 days after administration when the histological profiles were similar to that of normal groups. According to these result, it is suggested that Opaesan should be used in treatment of the duodenal ulcer but the funcitonal mechanisms were unknown.

CATV 망에서의 고속 DATA 서비스를 위한 적정 셀 규모에 관한 연구

정래성,구대성,김형준,김필중,김종빈 조선대학교 전자정보통신연구소 2001 電子情報通信硏究所論文誌 Vol.4 No.2

Recently the surrounding of data communication industry has been changing through the rapid growth of the information technology, which has been sparked by the convergence of computer and optical fiber technology. This phenomenon requires broadband network to transmit video, audio and data at once. Multimedia and broadband services are provided widely over the Internet. The traditional telephone companies, CATV operators, and Internet service providers are all rushing to provide integrated services over their infra-structures. Among them, CATV seems to be the most promising from an economic perspective, because CATV infrastructure is already in place in a majority of homes and can deliver broadband service without requiring costly upgrade of the existing CATV systems. In this paper, analysis the problem of data services over CATV network, suggest size the proper cell for the high speed data services over CATV network.

만성 심부전환자의 혈액에서 측정한 Tumor necrosis factor-α 및 Interleukin-6의 임상적 의의

김명구,김성구,박상호,한대희,강진환,변정득,심규혁,최병조,방덕원,온영근,현민수,권영주 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background and objectives: Many conditions are responsible for the pathophysiology and progressive mechanisms of congestive heart failure. More recently, it has also become evidence that another class of biologycally activated molecules generically reffered to as cytokine these are also over expressed in congestive heart failure. Therefore, the purpose of this study was to measure concentrations of tumor necrosis factor-α(TNF-α), interleukin-6(IL-6) in mild to severe symptoms of heart failure and compare their values with those found in normal control and analysed correlation relationship between cytokine level, clinical findings and hemodynamic indicies. Subjects and Methodology: Levels of TNF-α and IL-6 were measured on pulmonary artery during cardiac catheterization in heart failure patients(n=32) and normal subjects(n=8) as well as physical examination and echocardiogram. Cytokines assay were performed on plasma using commercially available ELISA(Enazyme-Linked Immunosorbent Assay) kits. Results: Although the levels of TNF-α and IL-6 tend to increase in congestive heart failure group, the cytokines level was not made significantly statistical difference between congestive heart failure group and controls. When analyzing the correlation between the levels of PCWP(pulmonary capillary wedge pressure) and cytokines(TNF-α, IL-6), respectively, there were statistically significant correlation coefficient 0.32,(p<0.05), 0.39(p<0.01). The cytokine IL-6 and pressure of pulmonary artery were significant correlation.(correlation coefficient 0.36, p<0.02) More significantly, there was correlated with TNF-α and IL-6.(correlation coefficient 0.57, p<0.001) Conclusions: There was tended toward high concentration of TNF-α & IL-6 in congestive heart failure and significant difference for PCWP between TNF-α & IL-6, thus may be correlated with development and progression in congestive heart failure.

대장암 조직에서 Western Blotting을 이용한 Survivin의 발현

강성구,이령아,김인경,문선미,황대용 대한대장항문학회 2003 Annals of Coloproctolgy Vol.19 No.6

반도체 메모리에 사용되는 전압발생기의 펌핑 커패시터 개선

김필중,구대성,윤중현,김종빈 조선대학교 전자정보통신연구소 2002 電子情報通信硏究所論文誌 Vol.5 No.1

In semiconductor memory, the kinds of voltage generator are high voltage generator, negative voltage generator, drain voltage generator and etc. The relevant circuits supported voltage generator, are clock generator, sense amplifier, voltage regulator and etc. The voltage generator consists of MOS diodes and MOS capacitors. To get the out voltage with sufficient charge, the MOS capacitors are big size. These MOS transistors can be adapted only on the EEPROM process. Thus, in this study, we designed stacked metal capacitor. This capacitor is small size bat can get capacitance. This capacitor is designed to comb type using metal-line and poly-line. The size of designed capacitor is 208×52 ㎛2 and the capacitance is about 4pF. The stacked metal capacitor can get much capacitance of 5~6 times than single plane capacitor. Also this capacitor will be easy adapted in sub-micro process technology of semiconductor memory. And this capacitor can be adapted on all memory process.

관상동맥질환 환자에서 스텐트 시술 후 재협착에 관한 연구

강진환,권영주,박상호,한대희,이상철,김명구,변정득,최병조,심규혁,온영근,현민수,김성구 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background and aims : In the coronary artery disease, a rate of restenosis was much decreased by placement of coronary stent than when percutaneous transluminal coronary angioplasty has been applied, but there are still important clinical problems of restenosis. There has been many progressive studies about various factors contributed to this restenosis. So, we studied a relation between restenosis after placement of coronary stent in the coronary artery disease and many clinical factors, characteristics of stenotic lesion and procedural factors, and also assessed the restenosis rate of various coronary stents. Methods : Total 58 lesions(46 cases of patients ; man 30, woman 16) were evaluated, which has been performed a follow-up coronary angiography after 6 months (mean 188 days) since coronary stent had been placed. Various stents were implanted and assessed a relation between restenosis and many factors. Results : Of 58 lesions were target stenotic studies, there were 22 of restenotic lesions(37.9%), and the restenosis rate wes statistically significant difference in the relation with diabetes mellitus(p<0.05), group of acute myocardial infarction(p<0.05) among clinical diagnosis of ischemic heart disease(stable angina, unstable angina and acute myocardial infarction) in clinical factors and with high dilation pressure of stent(p<0.05) in procedural factors. When the rate of restenosis was evaluated among implanted stents, it was lowest in the Multilink^(®) stent and highest in the Nir Royal^(®) stent(60%). Conclusion : In this study of restenosis and various factors after placement of stents in the coronary artety disease, factors such as diabetes mellitus, group of acute myocardial infarction and a dilation pressure of stent were significant related with restenosis and the restenosis rate of Multilink^(®) stent was lowest and the highest restenosis rate was of Nir Royal^(®) stent.

허혈성 심질환에서 염증지표에 관한 연구

번정득,권영주,박상호,한대희,이상철,강진환,김명구,심규혁,최병조,온영근,현민수,김성구 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background : Atherosclerosis is the chief underlying cause of ischemic heart disease and there is increasing evidence that inflammation is an important determinant of the development of atherosclerosis. We assessed the levels of inflammatory markers in patients with ischemic heart disease and normal group who has normal coronary angiograms. Materials and Methods : Coronary angiography was performed in 142 patients. 107 patients of ischemic heart disease(stable angina pectoris 58, unstable angina pectoris 30, Acute myocardial infarction 19) and 38 normal control subjects. We assessed the level of inflammatory markers, such as CRP, ESR, fibrinogen and leukocyte. Results : CRP, ESR and fibrinogen values of the patients with stable angina pectoris and unstable angina pectoris were higher than that of normal control group, but there were no statistical significance. Leukocyte value of the patients with unstable angina pectoris(9003.3±701.5/mm^(3)) was significantly higher than that of the patients with stable angina pectoris(6685.5±245.8/mm^(3)) and normal control subjects(6394.3±235.1/mm^(3)). CRP, ESR and fibrinogen values of the patients with acute myocardial infarction were also higher than that of normal control subjects. CRP was 3.88±2.05 mg/dL in acute mocardial infarction group, and 0.29±0.15 mg/dL in normal control subject group(p<0.05). Fibrinogen was 541.6±45.1 mg/dL in acute myocardial infarction group, 321.4±25.6 mg/dL in normal control subject group(p<0.05). Leukocyte was 10942.1±737.6/mm^(3) in acute myocardial infarction group, 6394.3±235.1/mm^(3) in normal control subject group(p<0.05). Conclusions : This study demonstrate that CRP, fibrinogen and leukocyte values of acute myocardial infarction group were significantly higher than that of control group and stable, unstable argina pectoris group. Leucokyte values were significantly elevated in unstable angina group, but CRP values were not in unstable angina group.

Implementation of MDCT core in Digital Audio with Micro-program type vector processor

Dae Sung Ku,Hyun Yong Choi,Kyung Tae Ra,Jung Yeun Hwang,Jong Bin Kim 대한전자공학회 2004 ICEIC:International Conference on Electronics, Inf Vol.2004 No.8