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이승연,곽동민,성기열,Lee, Seung-Youn,Kwak, Dong-Min,Sung, Gi-Yeul 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.4
The ability to navigate autonomously in off-road terrain is the most critical technology needed for Unmanned Ground Vehicles(UGV). In this paper, we present a method for vision-based terrain cover classification using DCT features. To classify the terrain, we acquire image from a CCD sensor, then the image is divided into fixed size of blocks. And each block transformed into DCT image then extracts features which reflect frequency band characteristics. Neural network classifier is used to classify the features. The proposed method is validated and verified through many experiments and we compare it with wavelet feature based method. The results show that the proposed method is more efficiently classify the terrain-cover than wavelet feature based one.
복잡한 환경에서 다중표적추적을 위한 고속 트랙병합 기법
이승연,윤주홍,이석재,정영헌,최덕선,Lee, Seung-Youn,Yoon, Joo-Hong,Lee, Seok-Jae,Jung, Young-Hun,Choe, Tok-Son 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.4
In this paper, we proposed a method of fast track merging which is the foundation of track to track association technique. The existing method of track merging is performed throughout comparison between tracks to tracks. Therefore, it has heavy calculation time. In our research, we developed a method for fast clustering by using nearest neighbor measurement identification. The simulation results show that the proposed method is more faster than previous method about 3.3%. We expect that this method could be effectively used in multi-target tracking particularly in heavy clutter environment.
다중빔 방식의 FMCW 레이더 표적신호 시뮬레이터 개발
이승연,최덕선,정영헌,이석재,윤주홍,Lee, Seung-Youn,Choe, Tok-Son,Jung, Young-Hun,Lee, Seok-Jae,Yoon, Joo-Hong 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.3
To detect targets for autonomous navigation of unmanned ground vehicle, mounted sensors are required to work all-weather condition. In this point of view, the FMCW radar is quietly appropriate. In this paper, we present development results of target signal simulator for multi-beam type FMCW radar. A target signal simulator make pseudo target signals which simulates multiple moving targets. And we describe how to make hit information for each target in multi-beam type radar. The developed methods are utilized for target tracking device. Moreover it can be applied to similar target signal simulator.
이승연,Lee, Seung-Youn 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.3
Adequate segmentation of target objects from the background plays an important role for the performance of automatic target recognition(ATR) system. This paper presents a new segmentation algorithm using fuzzy thresholding to extract a target. The proposed algorithm consists of two steps. In the first step, the region of interest(ROI) including the target can be automatically selected by the proposed robust method based on the frame difference of each image sensor. In the second step, fuzzy thresholding with a proposed membership function is performed within the only ROI selected in the first step. The proposed membership function is based on the similarity of intensity and the adjacency of target area on each image. Experimental results applied to real CCD/IR images show a good performance and the proposed algorithm is expected to enhance the performance of ATR system using multi-sensors.
천문동 추출물에 의한 조골세포 분화 촉진 및 파골세포 생성 억제효과
이승연(Seung Youn Lee),김시나(Si Na Kim),김종근(Jong Keun Kim) 한국식품영양과학회 2008 한국식품영양과학회지 Vol.37 No.1
천문동 에탄올 추출물은 조골세포의 증식을 농도 및 시간의존적으로 유의성 있게 증가시켰으며 조골세포 분화유도 및 석회화에 관여하는 염기성 인산분해효소 활성을 효과적으로 촉진시켰다. 또한 TRAP 양성인 다핵 파골세포수 및 TRAP 활성도를 감소시켰다. 결과적으로 천문동 에탄올 추출물은 조골세포의 활성 증가 및 파골세포의 활성 억제 등뼈의 대사에 영향을 미치므로 뼈의 대사와 관련된 치료제 및 골다공증 예방 건강 보조식품으로서 개발 가능성이 있으며, 이와 관련된 작용기전 및 활성성분의 분리, 정제에 대한 연구가 더욱 필요할 것으로 사료된다. Bone mass in adults decreases with age because of the imbalance between the rate of bone formation and resorption. We performed this study to investigate whether Asparagus cochinchinensis (Lour.) Merr. (ACAE) plays a role in osteoblasts differentiation and osteoclasts formation. Ethanol extract of ACAE showed increase in the differentiation and alkaline phosphatase activity of osteoblasts. Also, it decreased the number of tartrate-resistant acid phosphatase (TRAP)-positive multinucleated cells (OCLs) and TRAP activity. Therefore, ACAE has the potential to prevent bone-related diseases such as osteoporosis by increasing the differentiation of osteoblasts and reducing both the number and activity of osteoclasts.
이승연(Seung-Youn Lee),최지훈(Ji-Hoon Choi),주상현(Sang-Hyun Joo),장철재(Chul-Jae Jang),김진욱(Jin-Wook Kim) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
무인차량의 효율적인 자율주행을 위한 영상기반의 지형분류기법에 대한 기존의 연구내용은 하늘 영역을 다른 지표면과 같이 처리하여, MLP분류기 학습시 오차 수렴속도가 느린 점과, 하늘과 지표면 사이의 경계 분류시 오분류 가능성이 높았다. 하지만, 본 논문에서 제시한 하늘탐지기법을 적용할 경우 기존기법과 달리 고속으로 하늘 영역을 탐지하고, 해당 영역을 별도로 처리하므로 오분류 가능성을 낮추었고, 수행시간 성능의 향상을 이루었다. 향후 개발된 기법은 지형인지장치에 적용되어 무인차량 전방 영상의 지표면 분류에 효과적으로 활용될 것으로 사료된다.