• 스마트미디어저널
• /
• 제13권5호
• /
• pp.9-18
• /
• 2024

객체 궤적 모델링은 다중 객체 추적(Multi Object Tracking, MOT)의 주요 과제다. CenterTrack은 객체 중심 위치를 추적하는 Heatmap 기반의 방법으로 이를 해결하고자 했다. 하지만 복잡한 움직임과 비선형성을 가진 객체를 추적할 때 제한적인 성능을 보였다. 우리는 CenterTrack의 성능 저하 요인을 보행자의 동적 움직임으로 간주하여 확장된 칼만 필터(Extended Kalman Filter, EKF)를 CenterTrack에 통합했다. 우리가 제안하는 방법의 우수성을 입증하기 위해 기존 칼만 필터(Kalman Filter, KF)와 무향 칼만 필터(Unscented Kalman Filter, UKF)를 CenterTrack에 적용 후 다양한 데이터셋에 비교 평가했다. 실험결과, EKF를 CenterTrack에 통합했을 때 73.7% MOTA(Multiple Object Tracking Accuracy)를 달성하며 CenterTrack에 가장 적합한 필터임을 확인했다.

• 환경생물
• /
• 제37권1호
• /
• pp.8-18
• /
• 2019

본 연구에서는 만경강 본류에서 2009~2016년 동안 어류의 트로픽 길드, 오염도, 내성도 및 어류평가지수(Fish Assessment Index; FAI)에 기반을 둔 다변수 생태건강도에 대한 화학적 수질 영향을 분석하였다. 수질 지표로서 전기전도도, 총인(TP) 및 암모니아성 질소($NH_4-N$) 농도는 최하류지점에서 가장 악화되는 것으로 나타났다. 어류현장 조사 결과, 8년간 만경강 본류에서는 총 14과 50종이 채집되었으며, 우점종은 내성종으로 잘 알려진 피라미(Zacco platypus)로서 22.9%를 차지하여 트로픽 특성의 악화현상을 보였고, 최류역에서는 비정상어종의 상대빈도가 가장 높게 나타나 생태교란이 아주 심각한 것으로 나타났다. Pearson 상관도 분석에 따르면, 내성어종 및 잡식어종의 상대빈도는 전기전도도, BOD 및 $NH_4-N$와 통계적으로 유의한 상관관계(r>0.30, p<0.05)를 보였고, 민감어종 및 충식어종의 상대빈도는 이들 변수들과 유의한 역상관 관계(r<-0.3, p<0.01)를 보였다. 어류 다변수 모델(FAI)을 이용한 생태건강도로서 평가된 FAI 모델 값은 평균 47(n=40)로서 건강도는 "보통상태(C)"로서 나타났고, 하류역(S3~S5) 지역에서 모델값은 모두 "나쁜상태(D)"로 나타나 수질악화에 의한 영향으로 평가되었다.

• 대한전자공학회논문지SD
• /
• 제42권2호
• /
• pp.65-72
• /
• 2005

공정기술과 EDA 툴의 발전에 따라서 하나의 실리콘 다이(Die)에 많은 IP가 집적되고 멀티프로세서가 포함되는 SoC 구조가 가능해지고 있다 그러나 대부분의 기존 SoC 버스는 공유버스 구조라는 문제점으로 인해 통신의 병목현상이 발생하고 이는 전체 시스템 성능을 저하시키는 요인이 된다. 많은 경우에 멀티프로세서 시스템의 성능은 CPU 자체의 속도보다는 효율적인 통신과 균형있는 연산의 분배가 좌우하게 된다 따라서 충분한 SoC 버스 대역폭(Bandwidth)을 확보하기 위한 하나의 해결책으로 크로스바 라우터(Crossbar Router)를 이용하여 효율적인 온 칩 버스구조인 SoC Network Architecture(SNA)를 제안한다. 제안된 SNA구조는 다중 마스터(multi-master)에 대해 다중 채널(multi-channel)을 제공하여 통신의 병목현상을 크게 줄일 수 있으며 뛰어난 확장성을 지원한다. 제안된 구조에 따라 모델 시스템을 설계하고 시뮬레이션을 진행한 결과 AMBA AHB 버스에 비해 평균 $40\%$ 이상 효율이 증가했다.

• 한국환경복원기술학회지
• /
• 제19권1호
• /
• pp.73-83
• /
• 2016

Forest degradation reduces ecosystem services provided by forest and could lead to change in composition of species. In North Korea, there has been significant forest degradation due to conversion of forest into terrace fields for food production and cut-down of forest for fuel woods. This study analyzed the phenological changes in North Korea, in terms of vegetation and moisture in soil and vegetation, from March to Octorber 2013, using MODIS (MODerate resolution Imaging Spectroradiometer) images and indexes including NDVI (Normalized Difference Vegetation Index), NDSI (Normalized Difference Soil Index), and NDWI (Normalized Difference Water Index). In addition, marginal farmland was derived using elevation data. Lastly, degraded terrace fields of 16 degree was analyzed using NDVI, NDSI, and NDWI indexes, and marginal farmland characteristics with slope variable. The accuracy value of land cover classification, which shows the difference between the observation and analyzed value, was 84.9% and Kappa value was 0.82. The highest accuracy value was from agricultural (paddy, field) and forest area. Terrace fields were easily identified using slope data form agricultural field. Use of NDVI, NDSI, and NDWI is more effective in distinguishing deforested terrace field from agricultural area. NDVI only shows vegetation difference whereas NDSI classifies soil moisture values and NDWI classifies abandoned agricultural fields based on moisture values. The method used in this study allowed more effective identification of deforested terrace fields, which visually illustrates forest degradation problem in North Korea.

• Journal of Microbiology and Biotechnology
• /
• 제10권5호
• /
• pp.643-650
• /
• 2000

A new aniline-utilizing microorganism, strain HY1 obtained from an orchard soil, was characterized by using the BIOLOG system, an analysis of the total cellular fatty acids, and a 16S rDNA sequence. Strain HY1 was identified as a Burkholderia species, and was designated Burkholderia sp. HY1. GC and HPLC analyses revealed that Burkholderia sp. HY1 was able to degrade aniline to produce catechol, which was subsequently converted to cis,cis-muconic acid through an ortho-ring fission pathway under aerobic conditions. Strain HY1 exhibited a drastic reduction in the rate of aniline degradation when glucose was added to the aniline media. However, the addition of peptone or nitrate to the aniline media dramatically accelerated the rate of aniline degradation. A fatty acid analysis showed that strain HY1 was able to produce lipids 16:0 2OH, and 11 methyl 18:1 ${\omega}7c$ approximately 3.7-, 2.2-, and 6-fold more, respectively, when grown on aniline media than when grown on TSA. An analysison the alignment of a 1,435 bp fragment. A phylogenetic analysis of the 16S rDNA sequence based on a 1,420 bp multi-alignment sowed of the 16s rDNA sequence revealed that strain HY1 was very closely related to Burkholderia graminis with 95% similarity based that strain HY1 was placed among three major clonal types of $\beta$-Proteobacteria, including Burkholderia graminis, Burkholderia phenazinium, and Burkholderia glathei. The sequence GAT(C or G)${\b{G}}$, which is highly conserved in several locations in the 16S rDNA gene among the major clonal type strains of $\beta$-Proteobacteria, was frequently replaced with GAT(C or G)${\b{A}}$ in the 16S rDNA sequence from strain HY1.

• 대한약학회:학술대회논문집
• /
• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
• /
• pp.431.2-432
• /
• 2002

Mucopolysaccharidosis (MPS) is a genetic disorder with deficiency of Iysomal enzymes needed for the degradation of glycosaminoglycans(GAGs). This storage disease is characterized by intra-lysosomal accumulation of GAGs. progressive mental and physical deterioration. multi-organ failure and premature death. Quality of life (QOL) is very low in MPS patients. The MOS 36-ltem Short Form Health Survey (SF-36) was designed to measure the eight (8) dimensions of health in clinical and general population settings. (omitted)

• 한국광학회:학술대회논문집
• /
• 한국광학회 1995년도 광학 및 양자전자학 워크샵 논문집
• /
• pp.210-215
• /
• 1995

Technology development toward the use of LiNbO3-based acoustic tunable filters as WDM 2$\times$2 cross-connect switches is reviewed. Recenly, it was found that a fundamental behavior of multi-wavelength Bragg scattering critically affects the crosstalk performance of the acousto-optic tunable filter. We revuew serveral reported methods of overcoming the performance degradation. We will eventually ask whether the device is up to task of WDM optical switching.

• 한국멀티미디어학회논문지
• /
• 제18권5호
• /
• pp.620-630
• /
• 2015

This research suggests a load balancing method for a volume rendering system which supports concurrent users. When concurrent users use a volume rendering server system, the computational resources are occupied by a particular user by turns because each process consumes the computational resources as much as possible. In this case, the previous method shows acceptable throughput but the latency is increased for each user. In this research, we suggest a method to improve the latency without performance degradation. Each process makes concessions for taking the resources according to the number of users connected to the system. And we propose a load balancing method in the dynamic situation in which the number of users can vary. Using our methods, we can improve the latency time for each user.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 1998년도 추계종합학술대회 논문집
• /
• pp.887-890
• /
• 1998

We present a novel multi-resolution block matching algorithm (BMA) for fast motion estimation. At the coarsest level, a full search BMA (FSBMA) is performed for searching complex or random motion. Concurrently, spatial correlation of motion vector (MV) field is used for searching continuous motion. Here we present an efficient method for searching full resolution MVs without MV decimation even at the coarsest leve. After the coarsest level search, two or three initial MV candidates are chosen for the next level. At the further levels, the MV candidates are refined within much smaller search areas. Simulation results show that in comparison with FSBMA, the proposed BMA achieves a speed-up factor over 710 with minor PSNR degradation of 0.2dB at most, under a normal MPEG2 coding environment. Furthermore, our scheme is also suitable for hardware implementation due to regular data-flow.

• 한국정보통신설비학회:학술대회논문집
• /
• 한국정보통신설비학회 2007년도 학술대회
• /
• pp.350-353
• /
• 2007

This paper presents an real-time implementation of H.264/AVC High 4:4:4 Predictive profile decoder using general-purpose processors by exploiting multi-threading technique and Single Instruction Multiple Data (SIMD) instructions without any quality degradation. We analyze differences between the existing High profile and High 4:4:4 Predictive profile decoder, and show various optimization techniques to decode high fidelity and high definition (HD) video in real-time. Simulation results show that the proposed decoder can play high fidelity HD video at average 40 frames per seconds (fps) for the IBBrBP bistream and about 50 fps for the Intra-only bitstream.