• Journal of the Korean Association of Geographic Information Studies
• /
• v.27 no.1
• /
• pp.29-40
• /
• 2024

Recently, the technology of autonomous driving, one of the core of the fourth industrial revolution, is developing, but sensor-based autonomous driving is showing limitations, such as accidents in unexpected situations, To compensate for this, HD-map is being used as a core infrastructure for autonomous driving, and interest in the public and private sectors is increasing, and various studies and technology developments are being conducted to secure the latest and accuracy of HD-map. Currently, NGII will be newly built in urban areas and major roads across the country, including the metropolitan area, where self-driving cars are expected to run, and is working to minimize data error rates through quality verification. Therefore, this study analyzes the spatial relationship of reference objects in the attribute structuring process for rapid and accurate renewal and production of HD-map under construction by NGII, By applying the attribute input automation methodology of the reference object in which spatial relations are established using the library of open source-based PyQGIS, target sites were selected for each road type, such as high-speed national highways, general national highways, and C-ITS demonstration sections. Using the attribute automation tool developed in this study, it took about 2 to 5 minutes for each target location to automatically input the attributes of the spatial relationship reference object, As a result of automation of attribute input for reference objects, attribute input accuracy of 86.4% for high-speed national highways, 79.7% for general national highways, 82.4% for C-ITS, and 82.8% on average were secured.

• Proceedings of the Korean Society for Rock Mechanics Conference
• /
• 2007.10a
• /
• pp.19-36
• /
• 2007

When the trains runs at a high speed in the tunnel, passengers feel a pain in the ear that fast pressure fluctuation inside the tunnel being delivered with pressure fluctuation inside the passenger car. These phenomena are called "aural discomfort". Aural discomfort increase the passengers' uncomfort so that it is decreased a service level and serious case, it is able to damage the ear of the passenger. therefore aural discomfort must be considered the high-speed railroad tunnel cross-section design. To solve the problem of aural discomfort in a railway tunnel, some countries have standards on aural discomfort. It has been studied that different countries have different standards on aural discomfort. For that reason, the criteria of aural discomfort was reviewed through the standards of Kyungbu HSR line and different countries in this paper. And then Numerical Analysis of the Characteristics with tunnel cross-section change has been used for the selection of the optimum cross-section of Honam. The numerical analysis results were compared to field test results in order to verifying the reliability of the numerical analysis.

• Journal of Korea Society of Industrial Information Systems
• /
• v.19 no.3
• /
• pp.1-7
• /
• 2014

This paper describes the implementation of high speed comparator for the ATE (automatic test equipment) system. The comparator block is composed of continuous comparator, differential difference amplifier(DDA) and output stage. For the wide input dynamic range of 0V to 5V, and for the high speed operation (1~800MHz), high speed rail-to-rail amplifier is used in the first stage. And hysteresis circuits, pre-amp and latch are followed for high speed operation. To measure the difference of output signals between the two devices under test (DUTs), a DDA is applied because it can detect the differences of both common signals and differential signals. This comparator chip was implemented with $0.18{\mu}m$ BCDMOS process and can compare the signal difference of 5mV up to the frequency range of 800 MHz. The chip area of the comparator is $620{\mu}m{\times}830{\mu}m$.

• Journal of Broadcast Engineering
• /
• v.15 no.4
• /
• pp.540-546
• /
• 2010

Since the stereoscopic 3-dimensional (3D) video that provides users with a realistic multimedia service requires twice as much data as 2-dimensional (2D) video, it is difficult to construct the fast system. In this paper, we propose a fast stereoscopic 3D broadcasting system based on the depth information. Before the transmission, we encode the input 2D+depth video using x264, an open source H.264/AVC fast encoder to reduce the size of the data. At the receiver, we decode the transmitted bitstream in real time using a compute unified device architecture (CUDA) video decoder API on NVIDIA graphics processing unit (GPU). Then, we apply a fast view synthesis method that generates the virtual view using GPU. The proposed system can display the output video in both 2DTV and 3DTV. From the experiment, we verified that the proposed system can service the stereoscopic 3D contents in 24 frames per second at most.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.17 no.4
• /
• pp.53-60
• /
• 2007

In a known plaintext scenario, fast correlation attack is very powerful attack on stream ciphers. Most of fast correlation attacks consider the cryptographic problem as the suitable decoding problem. In this paper, we introduce advanced multi-pass fast correlation attack which is based on the fast correlation attack, which uses parity check equation and Fast Walsh Transform, proposed by Chose et al. and the Multi-pass fast correlation attack proposed by Zhang et al. We guess some bits of initial states of the target LFSR with the same method as previously proposed methods, but we can get one more bits at each passes and we will recover the initial states more efficiently.

• Journal of the Korean Institute of Telematics and Electronics S
• /
• v.35S no.10
• /
• pp.52-63
• /
• 1998

In this paper, several improvements to a copy network proposed previously for multicast packet switching are described. The improvements provide a solution to some problems inherent in multicasting. The input fairness problem caused by overf low is solved by a dynamic starting point decider(DSD), which can calculate running sums of copy requests starting from any input port. The starting point is changed adaptively in every time slot based on both the fill level of the input buffers in current time slot and the overflow situations of the previous time slot. Using the fill level of the conventional network. The DSD also provides the function of regulating overall copy requests according to the amount of input traffics. This is an essential function in improving overall throughputs of the copy networks. The throughput of a multicast switch can be improved substantially if partial service of copy request is implemented when overflow occurs. Call-splitting can also be implemented by the DSD in a straightforward manner. The hardware for the DSD is derived with the objective of simple architectures for the high speed operation. Simulation study of the copy network under various traffic conditions is presented to evaluate its performance.

• 한국HCI학회:학술대회논문집
• /
• 2006.02a
• /
• pp.1361-1366
• /
• 2006

본 논문에서는 제약되지 않은 카메라에서 얻어진 회전과 크기 변화를 가진 영상들을 특징 기반의 보로노이 거리 매칭 방법을 이용하여 고속으로 합성 하는 기법에 관해 기술한다. 기존의 특징점 기반 매칭 기법들이 사람의 개입에 의해 영상을 정합하거나, 크기나 회전 변화를 고려하지 않은 형태의 영상들을 처리하는 것과 달리 회전이나 크기변화요소가 포함된 입력영상들을 사람의 개입이 없이 자동으로 정확한 중첩영역을 빠르게 검색하는 방법을 제안한다. 제안된 방법은 우선 영상내의 특징 점들의 위상 정보와 특징 점들 사이의 거리 정보를 가지는 보로노이 거리 정합법을 통해 대응점을 구하고, 찾아진 대응 쌍들을 이용하여 2차원 투영의 초기 변환행렬을 구한다. 다음으로 비선형 이승오차 최적화 알고리즘을 이용하여 최적의 변환 행렬을 구한 후, 마지막으로 구해진 변환 행렬을 이용하여 영상을 합성한다. 실험결과를 통해 본 논문에서 제안한 방법의 효율성을 보인다.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
• /
• 2006.06a
• /
• pp.111-114
• /
• 2006

특징점(minutiae)에 기반한 정합 방식은 간결하고 계산이 쉬워서 가장 널리 사용되는 반면 동일한 지문의 두 입력 사이에서 발생할 수 있는 여러 가지 왜곡들을 고려해야 한다. 본 논문에서는 이러한 왜곡들을 줄이고 포인트 패턴을 이용하여 고속 지문정합 알고리즘을 설계하였으며 1:N정합에 적합한 알고리즘이다. 특징점 추출 알고리즘에서 구한 특징점에 직교좌표의 정보를 조합한 특징점들 중에서 정합을 시도하려는 두 개 특징점 데이터 집합에 대하여 지역 정합을 시도하여 지역 정합된 특징점의 비율이 임계값을 넘어가면 전역 정합을 시도하여 정합 점수를 결정하고 가장 높은 정합수를 얻은 지문 데이터를 결정한다.

• Proceedings of the KIPE Conference
• /
• 2007.11a
• /
• pp.118-120
• /
• 2007

일반적인 AC/DC변환 장치는 안정화된 직류 전원을 얻기 위해 대용량의 커패시터와 고속의 전력용 반도체 스위칭 소자를 사용한다. 하지만, 이러한 소자의 사용으로 인해 입력측의 고조파 손실 및 역률 저하의 문제점을 갖게 되고 고속 스위칭에 따른 스위칭 손실에 의한 효율이 저하되는 문제점을 갖게 된다. 따라서 본 논문에서는 역률개선이 가능하고 스위칭 손실이 저감되는 ZVS 방식을 이용한 새로운 형태의 역률개선용 소프트스위칭 방식의 부스트 컨버터를 제안한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2011.07a
• /
• pp.396-398
• /
• 2011

본 논문은 두 대의 카메라와 한 대의 프로젝터로 구성된 Pro-cam시스템을 이용하여, 출력된 패턴 영상을 카메라로 촬영하고 이를 기반으로 Depth Map을 계산하는 모듈의 실시간 처리를 위한 GPU기반 병렬처리 기법을 제안한다. 입력받은 영상으로부터 구조광의 패턴을 해석하고, Depth Map을 계산하기 위해서, Dynamic pattern decoding하는 과정은 프로젝터의 패턴영상과 촬영된 카메라 패턴영상 간의 관계를 반복적으로 비교하므로, 이를 GPU 프로그래밍을 이용하여 병렬 처리를 통해 고속화하였다. 결과적으로 본 논문에서는 기존 CPU에서 수행했던 속도에 비해 약 18배정도 속도를 개선 할 수 있었다.