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Design and Implementation of a Pipelined Datapath for High-Speed Face Detection Using FPGA
Seunghun Jin,Dongkyun Kim,Thuy Tuong Nguyen,Daijin Kim,Munsang Kim,Jae Wook Jeon IEEE 2012 IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS - Vol.8 No.1
<P>This paper presents design and implementation of a pipelined datapath for real-time face detection using cascades of boosted classifiers. We propose following methods: symmetric image downscaling, classifier sharing, and cascade merging, to achieve the desired processing speed and area efficiency. First, an image pyramid with 16 levels is generated from the input image to simultaneously detect faces with different scales. The downscaled images are then transferred to the first stage of the cascade that is shared between the corresponding image pairs based on the pixel validity of the symmetric image pyramid. The last method exploits the different hit ratios of the cascade stages. We use a tree-structured cascade of classifiers since most of the nonface elements are eliminated during the early stages of the classifier. The use of a synthesis tool confirms that the proposed design reduces resource utilization by one-eighth without accuracy loss, compared to the fully parallelized implementation of the same algorithm. We implemented the proposed hardware architecture on a Xilinx Virtex-5 LX330 FPGA. The indicative throughput is 307 frames/s irrespective of the number of faces in the scene for standard VGA (640 × 480) images with an operating frequency of 125.59 MHz. We may ensure that face detection results are generated at each clock cycle after the initial pipeline delay, using this fully pipelined datapath for tree-structured cascade classifiers.</P>
Cluster-Based Trust Evaluation Scheme in an Ad Hoc Network
Seunghun Jin,정교일,윤현수,Chanil Park,Daeseon Choi 한국전자통신연구원 2005 ETRI Journal Vol.27 No.4
This paper presents a new trust evaluation scheme in an ad hoc network. To overcome the limited information about unfamiliar nodes and to reduce the required memory space, we propose a cluster-based trust evaluation scheme, in which neighboring nodes form a cluster and select one node as a cluster head. The head issues a trust value certificate that can be referred to by its non-neighbor nodes. In this way, an evaluation of an unfamiliar node’s trust can be done very efficiently and precisely. In this paper, we present a trust evaluation metric using this scheme and some operations for forming and managing a cluster. An analysis of the proposed scheme over some security problems is also presented.
Real-time Sound Localization Using Generalized Cross Correlation Based on 0.13 ㎛ CMOS Process
Jin, Jungdong,Jin, Seunghun,Lee, SangJun,Kim, Hyung Soon,Choi, Jong Suk,Kim, Munsang,Jeon, Jae Wook The Institute of Electronics and Information Engin 2014 Journal of semiconductor technology and science Vol.14 No.2
In this paper, we present the design and implementation of real-time sound localization based on $0.13{\mu}m$ CMOS process. Time delay of arrival (TDOA) estimation was used to obtain the direction of the sound signal. The sound localization chip consists of four modules: data buffering, short-term energy calculation, cross correlation, and azimuth calculation. Our chip achieved real-time processing speed with full range ($360^{\circ}$) using three microphones. Additionally, we developed a dedicated sound localization circuit (DSLC) system for measuring the accuracy of the sound localization chip. The DSLC system revealed that our chip gave reasonably accurate results in an experiment that was carried out in a noisy and reverberant environment. In addition, the performance of our chip was compared with those of other chip designs.
FPGA Design and Implementation of a Real-Time Stereo Vision System
Seunghun Jin,Junguk Cho,Xuan Dai Pham,Kyoung Mu Lee,Sung-Kee Park,Munsang Kim,Jae Wook Jeon IEEE 2010 IEEE transactions on circuits and systems for vide Vol.20 No.1
<P>Stereo vision is a well-known ranging method because it resembles the basic mechanism of the human eye. However, the computational complexity and large amount of data access make real-time processing of stereo vision challenging because of the inherent instruction cycle delay within conventional computers. In order to solve this problem, the past 20 years of research have focused on the use of dedicated hardware architecture for stereo vision. This paper proposes a fully pipelined stereo vision system providing a dense disparity image with additional sub-pixel accuracy in real-time. The entire stereo vision process, such as rectification, stereo matching, and post-processing, is realized using a single field programmable gate array (FPGA) without the necessity of any external devices. The hardware implementation is more than 230 times faster when compared to a software program operating on a conventional computer, and shows stronger performance over previous hardware-related studies.</P>
Real-time Sound Localization Using Generalized Cross Correlation Based on 0.13 m CMOS Process
Jungdong Jin,Seunghun Jin,SangJun Lee,Hyung Soon Kim,Jong Suk Choi,Munsang Kim,Jae Wook Jeon 대한전자공학회 2014 Journal of semiconductor technology and science Vol.14 No.2
In this paper, we present the design and implementation of real-time sound localization based on 0.13 m CMOS process. Time delay of arrival (TDOA) estimation was used to obtain the direction of the sound signal. The sound localization chip consists of four modules: data buffering, short-term energy calculation, cross correlation, and azimuth calculation. Our chip achieved real-time processing speed with full range (360°) using three microphones. Additionally, we developed a dedicated sound localization circuit (DSLC) system for measuring the accuracy of the sound localization chip. The DSLC system revealed that our chip gave reasonably accurate results in an experiment that was carried out in a noisy and reverberant environment. In addition, the performance of our chip was compared with those of other chip designs.
진승헌(Seunghun Jin),김희선(Heesun Kim),조상래(Sangrae Cho),조영섭(Yeongsub Cho) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.2Ⅰ
인터넷상의 안전한 전자상거래에 효과적인 인증/인가 서비스를 제공하기 위해서는 공개키기반구조와 권한관리기반기반구조의 효율적인 연동이 필요하며 이를 위해서는 먼저 공개키 인증서와 속성인증서의 연동이 필요하다. 그러나 현재까지는 공개키 인증서와 속성인증서의 프로파일에 대한 독자적인연구만 진행되고 상호간의 구체적인 연동방법 및 시나리오에 대하여 기술하고 있지는 않다.[6],[7] 따라서 본 논문에서는 공개키 인증서와 속성인증서의 연동 방법의 요구사항을 정의하고 설계와 모델을 보임으로써 효과적인 인증/인가 서비스 제공 모델의 가능성을 제시한다.
Arc Stability Index Using Phase Electrical Power in AC Electric Arc Furnace
SeungHun Kim,Jae Jin Jeong,KyuHwan Kim,Jong Hyun Choi,Sang Woo Kim 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
In AC electric arc furnace, the state of the arc is a major concern to save the electrical power and to increase the productivity. There have been several researches about the arc stability index, such as the index based on the direct measurements of arc current and the index using the three-phase to ground voltage. In this paper, a modified index, which considers the concepts of both voltages and currents, is introduced. This index is the mapped phase electrical power by a mapping function, and the electrical power is calculated from the phase to ground voltages and currents. The simulations of various cases are performed, and the modified index shows a good performance in analyzing the arc state compared to existing index.
Nanovesicle-based bioelectronic nose platform mimicking human olfactory signal transduction
Jin, Hye Jun,Lee, Sang Hun,Kim, Tae Hyun,Park, Juhun,Song, Hyun Seok,Park, Tai Hyun,Hong, Seunghun Elsevier Applied Science 2012 Biosensors & bioelectronics Vol.35 No.1
<P><B>Abstract</B></P> <P>We developed a nanovesicle-based bioelectronic nose (NBN) that could recognize a specific odorant and mimic the receptor-mediated signal transmission of human olfactory systems. To build an NBN, we combined a single-walled carbon nanotube-based field effect transistor with cell-derived nanovesicles containing human olfactory receptors and calcium ion signal pathways. Importantly, the NBN took advantages of cell signal pathways for sensing signal amplification, enabling ∼100 times better sensitivity than that of previous bioelectronic noses based on only olfactory receptor protein and carbon nanotube transistors. The NBN sensors exhibited a human-like selectivity with single-carbon-atomic resolution and a high sensitivity of 1fM detection limit. Moreover, this sensor platform could mimic a receptor-meditated cellular signal transmission in live cells. This sensor platform can be utilized for the study of molecular recognition and biological processes occurring at cell membranes and also for various practical applications such as food screening and medical diagnostics.</P> <P><B>Highlights</B></P> <P>▸ Nanovesicles containing hOR2AG1 derived from HEK-293 cells as sensing elements. ▸ CNT-based sensor transducers were functionalized with nanovesicles. <I>▸</I> Nanovesicle-based bioelectronic nose exhibited the <I>human-like detection</I> of amylbutyrate. ▸ Nanovesicle-based bioelectronic nose could mimic the receptor-mediated signal pathway of human olfactory systems.</P>