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무선 네트워크에서 I, P, B 프레임 패턴에 따론 멀티미디어의 효율적인 전송
문은지,손예진,강승석 서울여자대학교 2010 정보기술논문지 Vol.8 No.-
The advancement of neiwork technology helps expanding the use of multimedia transmissions, especially over the wireless networks. However, the signal attenuation and interference of the wireless networks results in the frequent packet losses, which produces a quality degradation of the media content. In order to tackle the quality degradation problem, many encoding schemes are introduced for transmitting multimedia data over the wireless networks. MPEG-4 is one of the multimedia encoding schemes to use I, p, and B frames in order to transmit video data. This paper analyzes the relationship between the quality of video and the patterns of the three frame types, and compares the quality (with PSNR) of the receiver-side video data transmitted over the wireless networks with applying diverse encoding patterns. In addition, this paper applies the two network transmission approaches, best effort and quality of service (QoS), to compare the video quality with diverse encoding patterns delivered over the wireless networks. According to the simulation results, the wireless network transmission approaches affect the quality of transmitted video, and especially the QoS approach outperforms the best effort by 11% in terms of the PSNR (Peak Signal to Noise Ratio).
고려 엉겅퀴(Cirsium setidens Nakai) 잎 조직을 이용한 callus 배양 및 항산화 활성 검증
박정훈,심예지,박기임,이인순,문혜연 대구대학교 특수교육재활과학연구소 2010 産業技術硏究 Vol.21 No.1
We described the effects of antioxidant activity on the extracts of tissue and callus formation by Cirsium setidens Nakai. The callus culture were induced from leaf tissue of Cirsium setidens in both MS and B5 medium with IAA or/and kinetin (0∼5.0 ㎎/ℓ). As medium for callus culture induced from Cirsium setidens, B5 medium showed better condition than MS media. MS medium brought to decrease callus differentiation after formation, on the other hand B5 medium induced to accelerate callus differentiation. Among phytohormones is required 0.5 ㎎/ℓ of IAA and between 2.0 ㎎/ℓ and 1.0 ㎎/ℓ of Kinetin for formation of callus. In order to extract functional material from natural leaf and callus tissue of Cirsium setidens used distilled water and 75% ethanol as solvent and those extract used to determine antioxidant activity as alpha-diphenyl-2-picryl-hydrozyl (DPPH) radicals scavenging effect and TBA(thiobarbituric acid) activity. In result, the effect of DPPH and TBA had high activity more natural leaf extract than callus tissue and 75% ethanol was solvent better than distilled water. The 75% ethanol extract of natural leaf showed an excellent antioxidant activity because that particularly had highest concentration of vitamin C and total phenol among those extracts
신동천,김예신,문지영,박화성,김진용,박선구 한국환경독성학회 2002 환경독성보건학회지 Vol.17 No.4
At present, the health risks associated with the natural radionuclides of ground water have become a concern as potential social problems. However, there are no regulatory actions or control strategies for such risks. Therefore, we have investigated and discussed the risks and associated management strategies for radionuclides in other countries. US EPA has proposed MCL (300 pCi/L) and AMCL (4,000 pCi/L) for radon, and 30 ppb for uranium, 15 pCi/L for gross-alpha and 5 pCi/L for radium as final MCLs. Also, Canada, WHO and European countries have their inherent management levels. Finally, we suggested several criteria for setting guidelines in our countries including exposure related criteria such as geological distribution, occurrence, exposure probability distribution, exposure population and multimedia exposure assessment, acceptable risk, and cost-benefit analysis. The national-scale exposure and risk assessment, and economic analysis should be conducted for producing and aggregating the representative information on these criteria.
Pyruvate Kinase M2 : A Novel Biomarker for the Early Detection of Acute Kidney Injury
Ji Hyun Cheon,Sun Young Kim,Ji Yeon Son,Ye Rim Kang,Ji Hye An,Ji Hoon Kwon,Ho Sub Song,Aree Moon,Byung Mu Lee,Hyung Sik Kim 한국독성학회 2016 Toxicological Research Vol.32 No.1
The identification of biomarkers for the early detection of acute kidney injury (AKI) is clinically important Acute kidney injury (AKI) in critically ill patients is closely associated with increased morbidity and mortality. Conventional biomarkers, such as serum creatinine (SCr) and blood urea nitrogen (BUN), are frequently used to diagnose AKI. However, these biomarkers increase only after significant structural damage has occurred. Recent efforts have focused on identification and validation of new noninvasive biomarkers for the early detection of AKI, prior to extensive structural damage. Furthermore, AKI biomarkers can provide valuable insight into the molecular mechanisms of this complex and heterogeneous disease. Our previous study suggested that pyruvate kinase M2 (PKM2), which is excreted in the urine, is a sensitive biomarker for nephrotoxicity. To appropriately and optimally utilize PKM2 as a biomarker for AKI requires its complete characterization. This review highlights the major studies that have addressed the diagnostic and prognostic predictive power of biomarkers for AKI and assesses the potential usage of PKM2 as an early biomarker for AKI. We summarize the current state of knowledge regarding the role of biomarkers and the molecular and cellular mechanisms of AKI. This review will elucidate the biological basis of specific biomarkers that will contribute to improving the early detection and diagnosis of AKI.
Ji Ye Mok,Seung-Il Jeong,Jung-Keun Cho,Ji-Won Choi,Sang-Yun Nam,Won-Chil Chang,Byung-Eun Moon,Seon Il Jang 한국콘텐츠학회 2009 ICCC International Digital Design Invitation Exhib Vol.2009 No.12
Atopic dermatitis (AD) is a chronically relapsing prurtttc inflammatory skin disease. The effective microorganism fermentation extract (EM-X) is an antioxidant cocktail derived from the fermentation of plant material with effective microorganisms, it shows an anti-inflammatory, anticancer, and antioxidant effects. To find new anti¬inflammatory products for skin inflammatory disease such as AD and contact dermatitis, we produced the effective microorganism fermentation substance (EM-S) by fermentation of medicinal plants with effective microorganisms including photosynthetic bacteria, lactic acid bacteria and yeast, screened the effects of EM-S on mouse models of acute and chronic inflammatory responses. The effects of EM-S treatment inhibited 12-O-tetradecanoylphorbol 13-actate (TPA)-induced ear edema in Balb/c mice. Topically applied EM-S significantly reduced ear thickness, severity score and histological grade in AD-like NC/Nga mouse model by the house dust mite antigen (Dermatophagoides farinse extract) sensitization. In addition, the serum IgE and tissue Th2 chemokine levels were significantly reduced by EM-S. These results demonstrate that topical application of EM-S may be improve the AD-like skin lesion by suppressing IgE and Th2 chemokines.