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  • Title/Summary/Keyword: 내부패턴

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Design and Performance Evaluation of a 3-Dimensional Nonblocking Copy Network for Multicast ATM Switches (ATM 멀티캐스트 스위치를 위한 3차원 논블럭킹 복사망의 설계 및 성능평가)

  • 신재구;손유익
    • Journal of KIISE:Information Networking
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    • v.29 no.6
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    • pp.696-705
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    • 2002
  • This paper presents a new copy network for multicast ATM switches. Many studies have been carried out up to date since the proposition of Lee's copy network. However, the overflows and cell conflicts within the switch have still been raised a problem in argument. In order to reduce those problems, we proposed a 3-dimensional multicast switching architecture which has shared buffers in this paper. The proposed architecture can reduce the overflows and cell conflicts through multiple paths and output ports even in the high load environments. Also, we proposed a cell splitting algorithm which handles the cell in the case of large fan-out, and a copy network to increase throughput by expanding the Lee's Broadcast Banyan Network(BBN). Cell copy uses the Boolean interval splitting algorithm and the multicast pattern of the cells according to the self-routing characteristics of the network. In the proposed copy network, we improve the problems such as overflow, cell splitting of large fanout, cell conflicts, etc., which were still existed in the Lee's network. The results of performance evaluation by computer simulation show that the proposed scheme has better throughput, cell loss rate and cell delay than the conventional method.

Classification of Breast Tumor Cell Tissue Section Images (유방 종양 세포 조직 영상의 분류)

  • 황해길;최현주;윤혜경;남상희;최흥국
    • Journal of the Institute of Convergence Signal Processing
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    • v.2 no.4
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    • pp.22-30
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    • 2001
  • In this paper we propose three classification algorithms to classify breast tumors that occur in duct into Benign, DCIS(ductal carcinoma in situ) NOS(invasive ductal carcinoma) The general approach for a creating classifier is composed of 2 steps: feature extraction and classification Above all feature extraction for a good classifier is very significance, because the classification performance depends on the extracted features, Therefore in the feature extraction step, we extracted morphology features describing the size of nuclei and texture features The internal structures of the tumor are reflected from wavelet transformed images with 10× and 40× magnification. Pariticulary to find the correlation between correct classification rates and wavelet depths we applied 1, 2, 3 and 4-level wavelet transforms to the images and extracted texture feature from the transformed images The morphology features used are area, perimeter, width of X axis width of Y axis and circularity The texture features used are entropy energy contrast and homogeneity. In the classification step, we created three classifiers from each of extracted features using discriminant analysis The first classifier was made by morphology features. The second and the third classifiers were made by texture features of wavelet transformed images with 10× and 40× magnification. Finally we analyzed and compared the correct classification rate of the three classifiers. In this study, we found that the best classifier was made by texture features of 3-level wavelet transformed images.

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Geomorphic Evolution of Fluvial Terraces at Yeongdong.Yeongseo Streams in Gangwon Province, Korea (강원도 영동.영서 하천의 하안단구 지형 발달 - 내린천, 연곡천, 골지천, 오십천을 사례로)

  • Yoon, Soon-Ock;Hwang, Sang-Ill;Lee, Gwang-Ryul
    • Journal of the Korean Geographical Society
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    • v.42 no.3 s.120
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    • pp.388-404
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    • 2007
  • This study interprets evolution of fluvial terraces along the four Yeongdong- and Yeongseo streams such as Naerin River, Yeongok River, Golji River and Osip River, in Gangwon Province based on the tectonics. The results from the analyses of the distribution pattern of fluvial terraces and incision rates of rivers show distinctively the evidence as the axis of uplift by Taebaek Mountains, especially on the 4th, 5th and 6th terraces in upper reach of Osip River among the four streams. The axis of uplift extends to the zone of 3040km in width as well as the divide. The difference of uplift between upper and middle reaches of Naerin River and total reach of Golji River wasn't found from the height from riverbed by the active uplifting along all reaches, estimated to be set in inner area of uplift zone. Incision rate of period between formation age of 2nd terrace and 1st terrace is calculated 0.130.22m/ka, and incision rate of period between formation age of 1st terrace and Present is diversely calculated 0.170.27m/ka by the climatic discrepancy between the two periods. The incision rate of Yeongdong streams whose mouths reach to the sea level eroded actively more than Yeongseo streams in the uplift zone. And Yeongdong streams between formation age of 1th terrace and present appears to much higher than that of Yeongseo streams, due to active down-cutting in oder to balance against the sea level.

On the Design of Multi-layered Polygonal Helix Antennas (다각 다단 구조 헬릭스 안테나 설계)

  • Choo Jae-Yul;Choo Ho-Sung;Park Ik-Mo;Oh Yi-Sok
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.3 s.106
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    • pp.249-258
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    • 2006
  • In this letter, we propose a novel printed helix antenna for RFID reader in UHF band. The printed strip line of the antenna is first wound up outside a polygonal shaped layer and then the winding continues on an inner layer to control the overall gain and the radiation pattern. In addition, the winding pitch angles on each layer have either negative or positive values resulting in the broad CP bandwidth. The detail structure of the antenna was optimized using Pareto genetic algorithm(GA), so as to obtain excellent performances for RFID reader antennas. The optimized two-layered polygonal helix was fabricated on the cardboard of a flexible substrate and the performances were measured and compared with the simulations. The fabricated antenna was made up of copper tape which can adhere to a flexible cardboard and had 21.4 % matching bandwidth, 31.9 % CP bandwidth, readable range of 5.5m2 with kr=3.2. Also based on the current distribution of the strip line of the antenna and sensitivity of the antenna bents points, we confirmed that the antenna has the quarter-wave transformer near the feed for the broad matching bandwidth and radiates the traveling wave for the broad CP bandwidth using the bent strip line.

A Study on Embrittlement of Fast Neutron-irradiated Nuclear Reactor Pressure Vessel Steels at Room- and Liquid Nitrogen-temperature (상온 및 액체질소 온도에서 고속 중성자 조사된 원자로 압력 용기의 취화 현상에 관한 연구)

  • Kim, H.B.;Kim, H.S.;Kim, S.K.;Shin, D.H.;Yu, Y.B.;Ko, J.D.
    • Journal of the Korean Magnetics Society
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    • v.15 no.2
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    • pp.142-147
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    • 2005
  • The embrittlement of fast neutron-irradiated reactor pressure vessel (RPV) steels was investigated by X-ray diffraction patterns at room temperature and M¨ossbauer spectroscopy at room- and liquid nitrogen-temperature. Neutron fluence on the samples were 1012,1013,1014,1015,1016,1017,1018n/cm2. The X-ray diffraction patterns showed that the structure of the neutron unirradiated sample was bcc type, where as but the neutron irradiated samples with the fluence higher than 1017n/cm2 were so severely damaged, that bcc type structure disappeared. The M¨ossbauer spectra of all samples showed superposition of two or more sextets. In this paper all M¨ossbauer spectra were fitted by three set of sextet. The isomer shift and quadrupole splitting values were found around zero. At liquid nitrogen temperature, magnetic hyperfine field and absorption area increase rapidly S 1 sextet in the samples of 1017\~1018n/cm2 neutron fluences. And at room temperature, magnetic hyperfine field and absorption increased rapidly at SI sextet in the samples of 1017\~1018n/cm2 neutron fluences. This rapid increase of magnetic hyperfine field and absorption area were inferred to be caused by the change of 56Fe,55Mn into 57Fe due to by neutron irradiation.

Studies on Miniaturization and Notched Wi-Fi Bandwidth for UWB Antenna Using a Wide Radiating Slot (넓은 방사 슬롯을 이용한 초광대역 안테나의 소형화와 Wi-Fi 대역의 노치에 관한 연구)

  • Beom, Kyeong-Hwa;Kim, Ki-Chan;Jo, Se-Young;Ko, Young-Ho
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.2
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    • pp.265-274
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    • 2011
  • In this paper, it is studied on wide radiating slot antenna's miniaturization for ultra wide-band(UWB) technologies and notch structure to prevent interference between UWB systems and existing wireless systems for using Wi-Fi service of IEEE standards 802.11 a/n. Proposed antenna that wide slot is decreased from λ/2 to λ/4 length of resonant frequency has decreased by 72 % compared with conventional antenna. And optimized T-shaped CPW-fed stub has satisfied UWB bandwidth for 3.0~11.8 GHz. Then, creating 2-order Hilbert curve slot line in the stub's patch area, 4.9~5.6 GHz that centered frequency is 5 GHz is eliminated. Finally, the designed antenna constructed on FR4-epoxy has 20×15mm2 dimension. The measured results that are obtained return loss under -10 dB through 3.2~11.8 GHz without Wi-Fi bandwidth, a linear phase characteristic, a stable group delay, and omnidirectional radiation patterns are presented.

CHARACTERISTICS OF TRAO 14M RADIO TELESCOPE (1999) (대덕전파천문대 14m 전파망원경의 특성(1999))

  • ROH DUK-GYOO;JUNG JAE HOON
    • Publications of The Korean Astronomical Society
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    • v.14 no.2
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    • pp.123-128
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    • 1999
  • The beam size and the antenna efficiency of TRAO 14m radio telescope were measured at 86.2, 98.0 and 115.2 GHz. The beam size was determined by deconvolving the azimuthal scanning data of the Venus. To test the accuracy of our deconvolution method, the beam size at 86.2 GHz was compared with that determined from the mapping data of SiO maser line and we found no difference between them. With above beam sizes, antenna efficiencies were calculated from the continuum measurements of Venus, Jupiter and Moon. The beam efficiencies at these frequencies are appeared to be 0.49, 0.45 and 0.41, respectively. On the other hand, we also suggest that an automatic focus setting can be adopted for TRAO radio telescope based on the gradual change of best focus with elevation.

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Image Generator Design for OLED Panel Test (OLED 패널 테스트를 위한 영상 발생기 설계)

  • Yoon, Suk-Moon;Lee, Seung-Ho
    • Journal of IKEEE
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    • v.24 no.1
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    • pp.25-32
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    • 2020
  • In this paper, we propose an image generator for OLED panel test that can compensate for color coordinates and luminance by using panel defect inspection and optical measurement while displaying images on OLED panel. The proposed image generator consists of two processes: the image generation process and the process of compensating color coordinates and luminance using optical measurement. In the image generating process, the panel is set to receive the panel information to drive the panel, and the image is output by adjusting the output setting of the image generator according to the panel information. The output form of the image is configured by digital RGB method. The pattern generation algorithm inside the image generator outputs color and gray image data by transmitting color data to a 24-bit data line based on a synchronization signal according to the resolution of the panel. The process of compensating color coordinates and luminance using optical measurement outputs an image to an OLED panel in an image generator, and compensates for a portion where color coordinates and luminance data measured by an optical module differ from reference data. To evaluate the accuracy of the image generator for the OLED panel test proposed in this paper, Xilinx's Spartan 6 series XC6SLX25-FG484 FPGA was used and the design tool was ISE 14.5. The output of the image generation process was confirmed that the target setting value and the simulation result value for the digital RGB output using the oscilloscope matched. Compensating the color coordinates and luminance using optical measurements showed accuracy within the error rate suggested by the panel manufacturer.

A Bloom Filter Application of Network Processor for High-Speed Filtering Buffer-Overflow Worm (버퍼 오버플로우 웜 고속 필터링을 위한 네트워크 프로세서의 Bloom Filter 활용)

  • Kim Ik-Kyun;Oh Jin-Tae;Jang Jong-Soo;Sohn Sung-Won;Han Ki-Jun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.43 no.7 s.349
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    • pp.93-103
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    • 2006
  • Network solutions for protecting against worm attacks that complement partial end system patch deployment is a pressing problem. In the content-based worm filtering, the challenges focus on the detection accuracy and its performance enhancement problem. We present a worm filter architecture using the bloom filter for deployment at high-speed transit points on the Internet, including firewalls and gateways. Content-based packet filtering at multi-gigabit line rates, in general, is a challenging problem due to the signature explosion problem that curtails performance. We show that for worm malware, in particular, buffer overflow worms which comprise a large segment of recent outbreaks, scalable -- accurate, cut-through, and extensible -- filtering performance is feasible. We demonstrate the efficacy of the design by implementing it on an Intel IXP network processor platform with gigabit interfaces. We benchmark the worm filter network appliance on a suite of current/past worms, showing multi-gigabit line speed filtering prowess with minimal footprint on end-to-end network performance.

A Method of Inspecting ITO Pattern and Node Using Measured Data of Each Node's Mutual Capacitance ITO Sensor (상호 유도 정전하 방식 ITO 센서의 노드별 측정 데이터를 이용한 ITO패턴과 노드 검사 방법)

  • Han, Joo-Dong;Moon, Byoung-Joon;Choi, Kyung-Jin;Kim, Dong-Han
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.7
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    • pp.230-238
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    • 2014
  • In this paper, we propose the possible way of accurate analysis and examination of ITO sensor to discriminate whether mutual capacitance ITO sensor is defective by using mutual capacitance of data in each node which consists of electrodes inside of ITO sensor. We have analyzed the structure characteristic of mutual capacitance ITO sensor which is used as an input device for not only small size electronics like mobile phone and tablets but also big size electronics and designed the circuit to inspect ITO sensor using touch screen panel IC. Set a variable related with mutual capacitance of charge and discharge and Implement to find and analyze accurate position when defect is made through the data from each node of ITO sensor. First, we can set a yield effective range through the first experiment data of mutual capacitance ITO sensor and by using the data of each node of ITO sensor which is the result from the second experiment, we can verify accuracy and effectiveness of effective range from the first experiment as a sample which is used in this experiment.