• Transactions on Electrical and Electronic Materials
• /
• 제13권4호
• /
• pp.212-214
• /
• 2012

Both the electrically positive and negative particles in a cell of quick response-liquid powder display (QR-LPD) are surrounded by conductive electrodes on the upper and lower substrate and the dielectric materials of the barrier ribs. Particles in a cell are attached to or detached from the other materials by image force, electric field, Coulomb's force, and Van der Waals' force. Through these forces, the moving particles form an image but induce clumping phenomena. Particles having a large kinetic energy by a large q/m value crash into the opposite electrode with high speed at a large driving voltage and quickly lose electrically charged material. As a result, these particles are clumped and degrade panel performance. The clumped particles in a cell are observed by microscopic photographs and ascertained by a response time. When the bias voltage is increased to 0.68-0.76 $V/{\mu}m$, particle clumping occurs abruptly and the response time increases sharply. This particle clumping is similarly observed after the number of driving times at the driving voltage (0.42-0.64 $V/{\mu}m$).

• 한국통신학회논문지
• /
• 제21권1호
• /
• pp.17-32
• /
• 1996

In this paper, a model for two-layered video traffic is proposed. The performance analysis of the proposed model and the effects of two-layer coding scehemes in ATM networks are also studied. ATM-based networks give the possibility to support image codingat variable bit rate(VBR). Two layer coding is one of the very promising methods among many proposed methods to compensate the cell loss, the major drawback in ATM networks. From the experimental data of the 2-layer coded video traffics, it is observed that traffic patterns of base layer and enhanced layer are highly correlate to each other, when constant image quality is kept. With this observation, coded two layered video traffic can be modeled as 2-dimensional Markov chain. The model well fit the real experimental data. The model was used for the analysis of the performance of statistical multiplexer with priorites in ATM networks.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2006년도 춘계종합학술대회
• /
• pp.927-930
• /
• 2006

마이크로프로세서 제조업체의 대명사로 불리는 인텔이 비메모리 시장을 거의 독점하고 있는 가운데, IBM, Sony, Toshiba 인 세 개의 기업이 도전적으로 힘을 합하여 차세대 엔터테인먼트 프로세서라고 불리는 멀티코어 기반의 Cell 프로세서를 개발하였다. Cell 프로세서는 기존의 Power 라는 아키텍쳐를 기반으로 하는 코어 PPE (Power processor Element)를 중심으로 8개의 데이터 처리용 코어 SPE(Synergistic processor Element)를 포함하고 있으며, SIMD(Single Input Multiple Data) 데이터 처리 방식을 지원하여 데이터 처리량이 많은 멀티미디어나 게임 어플리케이션을 처리하는데 최적화되도록 설계된 프로세서로서, 기본적으로는 Power 마이크로프로세서 아키텍쳐 및 구조에 대한 혁신적인 확장 기능을 포함하고 있다. 본 논문에서는 현존하는 프로세서 중 가장 성능이 우수하다고 평가받는 Cell 마이크로프로세서의 설계 개념과 그 구조에 대하여 분석한다.

• Animal cells and systems
• /
• 제13권2호
• /
• pp.97-103
• /
• 2009

Recently, great advance is achieved in the field of genome-wide functional screening using cell-based assay. Here, we briefly introduce well-established and typical cell-based assays of GPCR and some parameters which should be considered for genome-wide functional screening. Because of characters and importance of GPCR as drug targets, several ways of assay systems were devised. Among them, high-content screening (HCS) that is based on the analysis of image by confocal microscope is becoming favorite choice. The advances in this technology have been driven exclusively by industry for their convenience. Now, it is turn for academy to define more detail signaling networks via HCS using cDNA or siRNA libraries at genome-wide level. By isolating novel signaling mediators using cDNA or siRNA library, and postulating them as new candidates for therapeutic target, more understanding about life science and more increased chances to develop therapeutics against human disease will be achieved.

• 한국정보과학회논문지:시스템및이론
• /
• 제29권7호
• /
• pp.411-421
• /
• 2002

본 논문에서는 마이크로어레이 처리를 위한 새로운 이미지 분석 알고리즘과 격자 반점들의 위상 정보를 이용하여 격자의 위치를 결정하는 방법을 제시한다. 마이크로어레이는 유전자의 발현량의 측정을 위해서 수만 혹은 수십 만개의 유전자에 대해서 한번에 실험을 할 수 있는 장비이다. 한번의 실험으로 생성되는 데이터 양이 엄청나게 많기 때문에 자동화된 분석이 필요하다. 이 마이크로어레이의 실험 결과는 16-비트 회색조 이미지 파일로 하나의 유전자가 여러 개의 픽셀로 뭉쳐져 있는 반점(spot)이 격자 구조형태로 나타난다. 본 논문에서 이미지 데이터에서 그래프 구조를 생성하여 이들 반점이 어느 격자에 속하는지 결정하는 알고리즘과 격자 구조의 기울어짐을 측정하여 격자의 정확한 위치와 모양을 결정하는 방법을 제시하고 실제 이미지 데이터를 통한 많은 실험 결과를 보여 준다.

• 대한세포병리학회지
• /
• 제7권1호
• /
• pp.23-30
• /
• 1996

Chromatin texture, which partly reflects nuclear organization, is evolving as an important parameter indicating cell activation or transformation. In this study, chromatin pattern was evaluated by image analysis of the electron micrographs of follicular and papillary carcinoma cells of the thyroid gland and tested for discrimination of the two neoplasms. Digital grey images were converted from the electron micrographs, nuclear images, excluding nucleolus and intranuclear cytoplasmic inclusions, were obtained by segmentation; grey levels were standardized; and grey level histograms were generated. The histograms in follicular carcinoma showed Gaussian or near-Gaussian distribution and had a single peak, whereas those in papillary carcinoma had two peaks(bimodal), one at the black zone and the other at the white zone. In papillary carcinoma, the peak in the black zone represented an increased amount of heterochromatin particles and that at the white zone represented decreased electron density of euchromatin or nuclear matrix. These results indicate that the nuclei of follicular and papillary carcinoma cells differ in their chromatin pattern and the difference may be due to decondensed chromatin and/or matrix substances.

• 한국가시화정보학회지
• /
• 제16권1호
• /
• pp.15-20
• /
• 2018

For the measurement of biophysical properties related with cardiovascular diseases (CVD), various microfluidic devices were proposed. However, many devices were monitored by optical equipment. Ultrasound measurement to quantify the biophysical properties can provide new insights to understand the cardiovascular diseases. This study aims to check feasibility of microfluidic device for ultrasound image analysis based on 3D printer. To facilitate acoustic transmission, agarose solution is poured around 3D mold connected with holes of the acrylic box. By applying speckle image velocimetry(SIV) technique, flow information in the bifurcated channel was estimated. Considering that ultrasound signal amplitude is determined by red blood cell (RBC) aggregation, RBC aggregation in the bifurcated channel can be estimated through the analysis of ultrasound signal. As examples of microfluidic device which mimic the CVD model, velocity fields in microfluidic devices with stenosis and aneurysm were introduced.

• Fisheries and Aquatic Sciences
• /
• 제2권2호
• /
• pp.172-175
• /
• 1999

Relative DNA contents in some harmful algae were measured using DAPI staining and image analysis system. This method was useful to identify some morphologically similar species and isolates from harmful algal blooms (HABs). In exponential phase, Prorocentrum micans had higher relative DNA content (RD) of $1.83\pm0.52$ than any other isolates, followed by Cochlodinium polykrikoides $(1.10\pm0.46)$ Alexandrium tamarense $(0.93\pm0.32)$ Gyrodinium impudicum $(0.56\pm0.17)$, Scrippsiella trochoidea $(0.41\pm0.26)$ and P. minimum$(0.05\pm0.01)$. When they were fixed with Lugol's solution, it was difficult to d,iscern C. polykrikoides from G. impudicum under the light microscope, but the DNA contents were quite different in two species. C. polykrikoides contained about twice as much RD as G. impudicum under the same culture conditions and exponential phase. DAPI­stained DNA feature in C. polykrikodes showed concentrated in the peripheral part of the cell, but in G. impudicum showed a compact structure in the central part. Although A. tamarense and S. trochoidea were morphologically similar under the light microscope, nuclear DNA content of A. tamarense was twice as much as that of S. trochoidea.

• 한국정보통신학회논문지
• /
• 제15권12호
• /
• pp.2697-2704
• /
• 2011

조직 공학에서는 하이드로 젤 내 3차원 세포 배양 과정에서 세포와 세포간의 공생관계를 관찰하게 되는데, 시간이 경과함에 따라 세포들의 증가나 상호작용, 분화, 사멸되는 과정들을 고배율 공초점 현미경을 이용하여 단층 촬영하고, 촬영된 이미지들로부터 세포의 공생 메커니즘이나 변화 과정을 관찰 및 분석하기 위한 연구가 진행되고 있다. 본 연구에서는 하이드로 젤 내 3차원 세포 배양 과정에서 단층 촬영된 세포 이미지로부터 클러스터 경계선 정보를 추출하기 위한 수준별 잡음 제거 방법과 클러스터 경계선 추출 방법을 제안하였다. 실험을 통해 제안된 방법은 하이드로젤로 인한 좁쌀 모양의 잡음에 뛰어난 잡음 제거 성능을 보여 줄 뿐만 아니라 복잡한 클러스터들에 대해서 도 정확한 클러스터 경계선을 추출함을 보여 주었다.

• Journal of the Korean Wood Science and Technology
• /
• 제24권4호
• /
• pp.87-92
• /
• 1996

When cutting 2.0cm-thick red oak and hard maple with an air-jet-assisted carbon-dioxide laser of 2kW output power, maximum feed speed at the point of full penetration of the beam decreased with increasing the angle between grain and cutting direction. Feed speed averaged 3.75 and 3.38 meters per minute for red oak and hard maple, respectively. Gray-level of laser-cut surfaces were analyzed by image analysis system. The highest gray level of laser-cut surface was obtained when red oak was cut parallel to grain by laser. Surface profiler was used to scan the sawn and laser-cut surfaces. Center line average roughnesses of laser-cut surfaces were higher than those of sawn surfaces. Scanning electron micrographs showed the cell walls which were melted by laser.