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Extraction the Reduced P-Image from H.264/AVC Compressed Bit Stream
Thy-Linh Nguyen,Hyung-suk Oh,Won-Ha Kim 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
The reduced or small size image extracting DC coefficients from the H.264/AVC compressed bit stream is sixteen times smaller than the original image. In its small size, this image still retains a significant amount of information. We propose a scheme directly generating the small image from H.264 compressed bit stream. We extract only DC values from transform coefficients of H.264 bit stream with higher resolution. DC values become pixel values of the small image. The proposed method requires much less computational load and memory access, compared to the conventional method that decodes the bit stream to produce images and down-samples the decoded images.
Determining mean corpuscular volume and red blood cell count using electrochemical collision events
Ho, Thy L.T.,Hoang, Nhung T.T.,Lee, Jungeun,Park, Jun Hui,Kim, Byung-Kwon Elsevier 2018 Biosensors & bioelectronics Vol.110 No.-
<P><B>Abstract</B></P> <P>Blood tests (e.g., red blood cell (RBC) count) are crucial for detecting, diagnosing, and monitoring the progression of blood disorders. Here, we report the development of a new and rapid method for electrochemically detecting RBCs using single-particle collision events. The principle of this method relies on the electrochemical oxidation of an electroactive redox species (potassium ferrocyanide) hindered by an RBC attached to an electrode surface. A decrease in staircase current, caused by the collision of RBCs on the electrode, was observed. The magnitude of this current decrease could provide quantitative information on the size and concentration of RBCs, which could be converted into the mean corpuscular volume (MCV) and used for diagnosis. Anemia-related diseases caused by abnormal count of RBCs (e.g., erythrocytosis, pernicious anemia) or abnormal RBC size (e.g. megaloblastic anemia, microcytic anemia) could be detected easily and quickly using this electrochemical collision method, potentially leading to extensive applications in hematology and point-of-care blood testing devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A simple and convenient electrochemical method was developed to analyze individual RBCs. </LI> <LI> The number of RBCs was estimated by analyzing collision frequency. </LI> <LI> Abnormal size of RBCs was estimated from the magnitude of staircase current decrease. </LI> </UL> </P>
Anammox 생물막 반응기를 이용한 저농도 폐수 처리
( Linh-thy Le ),장덕진 ( Jahng Deokjin ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
The Anaerobic Ammonium Oxidation (Anammox) process was firstly discovered in the early 1990s (Mulder et al., 1995). It has been known as a novel and cost-effective biological process typically to treat wastewater had high nitrogen concentration and low concentration of chemical oxygen demand (COD) (Jetten et al., 1999; Wang et al., 2011). In this process, Anammox bacteria directly oxidize ammonia to nitrogen gas (N<sub>2</sub>) with nitrite as an electron donor under strictly anaerobic conditions. NH<sub>4</sub><sup>+</sup> + 1.32NO<sub>2</sub>- + 0.066HCO<sub>3</sub><sup>-</sup> + 0.13H+ à 1.02N<sub>2</sub> + 0.256NO<sub>3</sub><sup>-</sup>+ 0.066CH<sub>2</sub>O<sub>0.5</sub>N<sub>0.15</sub> + 2.03 H<sub>2</sub>O In recent years, Anammox process had mainly focus on side stream wastewater with high ammonia concentration. The success of Anammox-based side stream wastewater treatment, promoted investigation of its research for mainstream wastewater treatment with low ammonia concentration, typically ranging from 20-85 mgN L<sup>-1</sup> (Metcalf and Eddy, 1991) and low temperature. In this study, a 10 L lab-scale biofilm anammox continuous stirred tank reactor (A-CSTR) was operated to investigate the Anammox community structure and the performance of biofilm Anammox reactor at low nitrogen load. This reactor did not need to be sealed and purging nitrogen to avoid the diffusion of oxygen into the water surface due to the polyurethane foam balls floated on the surface of the reactor. The reactor was cover with a black cover to avoid light and the growth of algae. The temperature was control by using an aquarium heater (Aleas, China). Hydraulic retention time (HRT) was changed from 12 h to 7 h. The reactor was stirred at about 40 rpm by an overhead stirrer.The fiber carriers were utilized to retain the Anammox biomass. The A-CSTR was cultured by 1 L suspended Anammox sludge, originated from a 12.5 L lab-scale Anammox SBR. Extracellular polymeric substances (EPS) and scanning electron microscopy (SEM) of Anammox biomass were evaluated for microbial characterization. After four months, the biofilm Anammox reactor achieved a high nitrogen removal with NRR of 0.2 kg N m<sup>-3</sup> d<sup>-1</sup>, the effluent nitrogen concentration was lower the discharge standard of nitrogen in Korea. The noticing in this research was the dominant species of Anammox population shifted from C. Brocadia into C. Jettenia (18.4% of the microbial community).