• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.45 no.4
• /
• pp.43-48
• /
• 2008

This paper presents a design of 8B/10B encoder by the coding table reduction. The proposed encoder has reduced coding table modified disparity control block. Logic simulation and synthesis have been done for the proposed design. After synthesized using Magna CMOS $0.18{\mu}m$ process, the proposed design achieved the operating frequency of 343MHz and chip area of $1886{\mu}m^2$.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2017.06a
• /
• pp.184-185
• /
• 2017

최근 기술의 발전으로 자연스러운 미디어와 실재감을 제공하는 차세대 3D 기술이 많은 관심을 받고 있다. MMT는 MPEG에서 표준화를 진행하고 있는 차세대 미디어 전송 규격으로 방송망(Broadcast Network)과 인터넷을 동시에 서비스할 수 있는 하이브리드 방송에 적합한 기능을 제공한다. 본 논문에서는 8K(7,680 x 4,320)의 해상도를 가지는 영상을 다채널(4개의 채널) 영상으로 분리하고, 각각의 분리된 영상을 MPEG MMT 프로토콜을 이용해서 서버에서 4개의 채널로 전송, 4개의 클라이언트에서 미디어를 수신하고, 동기화 알고리즘을 이용하여 동기를 맞춘 후 최소의 지연시간 이내에 4채널의 미디어를 재현할 수 있는 기술을 설계하고 구현하였다.

• Journal of Broadcast Engineering
• /
• v.25 no.2
• /
• pp.151-156
• /
• 2020

In this paper, we propose a watermark extraction method of omnidirectional images using CNN (Convolutional Neural Network) to improve the extracted watermark accuracy of the previous deterministic method that based on algorithm. This CNN consists of a restoration process of extracting watermarks by correcting distortion during omnidirectional image generation and/or malicious attacks, and a classification process of classifying which watermarks are extracted watermarks. Experiments with various attacks confirm that the extracted watermarks are more accurate than the previous methods.

• Journal of Advanced Navigation Technology
• /
• v.11 no.1
• /
• pp.87-92
• /
• 2007

The conventional CELP(code excited linear prediction) type vocoder has no V/UV(voiced/unvoiced) classifier. So, the unvoiced speech is processed like the voiced speech. In this paper, to reduce the bit rate, we propose a new V/UV decision algorithm minimized error rate and preprocessing computation. This V/UV classifier use the LSP(line spectrum pair) parameter which is acquired spectrum analysis process in CELP vocoders. Applying this method to the 5.3kbps ACELP(algebraic code excited linear prediction) in the G.723.1, we can get the transmission bits rate reduction of 6% approximately without degradation of speech quality.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.13 no.1
• /
• pp.75-80
• /
• 2009

RSA cryptoprocessors equipped with more than 1024 bits of key space handle the entire key stream in units of blocks. The RSA processor which will be the target design in this paper defines the length of the basic word as 128 bits, and uses an 256-bits register as the accumulator. For efficient execution of 128-bit multiplication, 32b*32b multiplier was designed and adopted and the results are stored in 8 separate 128-bit registers according to the status flag. In this paper, a fast 32bit modular multiplier which is required to execute 128-bit MAC (multiplication and accumulation) operation is proposed. The proposed architecture prototype of the multiplier unit was automatically synthesized, and successfully operated at the frequency in the target RSA processor.

• Journal of KIISE:Computer Systems and Theory
• /
• v.31 no.3_4
• /
• pp.187-194
• /
• 2004

Shear-Warp volume rendering has many advantages such as good image Quality and fast rendering speed. However in the interactive classification environment it has low efficiency of memory access since preprocessed classification is unavailable. In this paper we present an algorithm using the spacial locality of memory access in the interactive classification environment. We propose an extension model appending a rotation matrix to the factorization of viewing transformation, it thus performs a scanline-based rendering in the object and image space. We also show causes and solutions of three problems of the proposed algorithm such as inaccurate front-to-back composition, existence of hole, increasing computational cost. This model is efficient due to the spacial locality of memory access.

• Journal of Korean Society of Transportation
• /
• v.22 no.2 s.73
• /
• pp.165-175
• /
• 2004

본 고는 대전광역시 첨단교통모델도시 건설사업의 일환으로 구축된 DSRC(Dedicated Short Range Communication) 기술을 활용한 교통정보시스템 구축 사례를 소개함을 목적으로 한다. 공공부문에서의 구간정보 수집 및 가공 체계 구축은 본 대전 ITS 사업이 처음이며 더욱이 DSRC 기술을 구간정보 수집에 적용한 최초의 시도이다. 이에 시스템 구축과정에서 적지 않은 쟁점이 도출되었고, 많은 시행착오를 통해 그 해법을 찾아가며 현재 운영중인 시스템을 완공하게 되었다. 노변기지국(RSE)과 차량장치(OBE)간의 통신에 의해 수집된 자료는, 필터링, 검지기 지점정보, 패턴데이터 등과의 자료합성, 평활화, 통계정보 및 패턴정보 생성 등의 과정을 거쳐 구간소통정보가 산출된다. 현재 운영중인 본 시스템은 향후 지속적으로 보완 발전시켜 나가야 하며, 이를 위해 프로브 수집체계 보완, 시스템의 성능평가, 패턴데이터의 적절한 유지관리, 알고리즘의 지속적 발전 등을 향후과제로서 제시하였다. 본 고는 ITS사업에 있어 중요 쟁점중에 한 분야인 소통정보의 가공 절차를 공유함으로써, 관련 분야의 기술개발 촉진과 향후 유사시스템 구축의 시행착오를 줄이는데 기여할 수 있으리라 판단된다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2013.06a
• /
• pp.286-288
• /
• 2013

감시 카메라에서 야간 시간대의 영상 품질은 매우 중요한 요소 중 하나이다. 본 논문에서는 IR LED Camera 에서 적외선 LED 를 사용한 회로적 제어를 통한 노출 제어에 문제점을 분석하고, 이를 해결하기 위한 적응적 배경 모델링과 IR 카메라의 특화된 객체 검출 방법을 제안한다. 노출 제어 방식의 배경을 제외한 적응적 배경과 객체의 합성으로 향상된 야간 영상획득 방식을 제안한다. 영상 개선 실험 결과는 기존의 회로적 노출 제어 방식의 영상보다 제안하는 방식이 프로세스의 단순화를 통한 비용 절감 효과와 야간 영상 품질 향상의 우수성을 보여준다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.9 no.2
• /
• pp.237-241
• /
• 2005

In Bluetooth version 1.0, the frequency hopping algorithm was such that there was one piconet, using a specific frequency, resolving the frequency depending on the part of the digits of the device clock and the Bluetooth address. Basic pattern was a kind of a round-robin using 79 frequencies in the ISM band. At this point, a problem occurs if there were more than two devices using the same frequency within specific range. In this paper, we proposed a software-based adaptive frequency hopping method so that more than two wireless devices can stay connected without frequency crash. Suggested method was implemented with HDL(Hardware Description Language) and automatically synthesized and laid out. Implemented adaptive frequency hopping circuit operated well in 24MHz correctly.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.5 no.1
• /
• pp.23-33
• /
• 2001

In this paper we propose a multi-codebook structure which can synthesize high quality speech without increasing of CELP coder's computation. We also design a 4.8kbps CELP speech coder with the proposed codebook structure. The proposed multi-codebook structure is made up of basic codebook and the other codebook which Is formed for strengthen spectrum an4 pitch. Multi-codebook structure can represent accurate gains since it represents excitation signals as summation of two kinds of codebooks and uses different codebook gains respectively. Therefore it can provide better speech quality than other conventional structures. In computer simulation of the 4.8kpbs CELP coder designed with the proposed codebook structure its segSNR was 0.81dB more high than the DoD CELP coder of same transmission rates.