CNN 기반 한국 번호판 인식

Tang Quang Hieu,연승호(Seungho Yeon),김재민(Jaemin Kim) 한국전기전자학회 2019 전기전자학회논문지 Vol.23 No.4

자동 한국 번호판 인식 (AKLPR)은 많은 분야에서 사용된다. 이러한 응용 분야에서 ALPR은 높은 인식률과 빠른 처리 속도가 중요하다. 최근 딥러닝의 발전으로 객체 감지 및 인식의 정확도와 속도가 향상 되고 있으며, 그 결과 딥러닝이 ALPR에 적용되고 있다. 특히 합성곱신경망(Convolutional Neural Network) 기반 객체 검출기가 ALPR에 적용되었다. 이러한 ALPR은 LP 영역을 검출하는 단계와 LP 영역의 문자를 검출 및 인식하는 단계로 구분되며, 각 단계는 별도의 CNN으로 구현된다. 본 논문에서는 단일 단계 CNN으로 ALPR을 구현하는 아키텍처를 제안한다. 제안하는 방법은 높은 인식률을 유지하면서 빠른 속도로 번호판 문자를 인식한다. The Automatic Korean license plate recognition (AKLPR) is used in many fields. For many applications, high recognition rate and fast processing speed of ALPR are important. Recent advances in deep learning have improved the accuracy and speed of object detection and recognition, and CNN (Convolutional Neural Network) has been applied to ALPR. The ALPR is divided into the stage of detecting the LP region and the stage of detecting and recognizing the character in the LP region, and each step is implemented with separate CNN. In this paper, we propose a single stage CNN architecture to recognize license plate characters at high speed while keeping high recognition rate.

The complete mitochondrial genome of fall armyworm Spodoptera frugiperda (Lepidoptera:Noctuidae)

Bo-Ping Tang,Qiu-Ning Liu,Xin-Yue Chai,Dan-Dan Bian,Bao-Ming Ge,Chun-Lin Zhou 한국유전학회 2016 Genes & Genomics Vol.38 No.2

The mitochondrial genome (mitogenome) can provide important information for understanding molecular evolution and phylogenetic analyses. The complete mitogenome of Spodoptera frugiperda (Lepidoptera:Noctuidae) was determined to be 15,365 bp in length and has the typical gene order found in Noctuidae mitogenomes, it includes 13 protein-coding genes (PCGs), two rRNA genes, 22 tRNA genes and a A?T-rich region. The nucleotide composition was biased toward A?T nucleotides (81.09 %) and the AT skew of this mitogenome was slightly positive (0.004). All PCGs were initiated by ATN codons, except for cytochrome c oxidase subunit 1 (cox1) gene which was initiated by CGA. Eight of the 13 PCGs have the incomplete termination codon, T or TA. All the tRNA genes displayed the typical clover-leaf structure of mitochondrial tRNAs, with the exception of trnS1 (AGN). The A?T-rich region was 328 bp in length and consisted of several features common to the Noctuidae insects. Phylogenetic analysis showed that the S. frugiperda was within the Noctuidae.

Resonant Frequency Estimation of Reradiation Interference at MF from Power Transmission Lines Based on Generalized Resonance Theory

Bo, Tang,Bin, Chen,Zhibin, Zhao,Zheng, Xiao,Shuang, Wang The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.3

The resonant mechanism of reradiation interference (RRI) over 1.7MHz from power transmission lines cannot be obtained from IEEE standards, which are based on researches of field intensity. Hence, the resonance is ignored in National Standards of protecting distance between UHV power lines and radio stations in China, which would result in an excessive redundancy of protecting distance. Therefore, based on the generalized resonance theory, we proposed the idea of applying model-based parameter estimation (MBPE) to estimate the generalized resonance frequency of electrically large scattering objects. We also deduced equation expressions of the generalized resonance frequency and its quality factor Q in a lossy open electromagnetic system, i.e. an antenna-transmission line system in this paper. Taking the frequency band studied by IEEE and the frequency band over 1.7 MHz as object, we established three models of the RRI from transmission lines, namely the simplified line model, the tower line model considering cross arms and the line-surface mixed model. With the models, we calculated the scattering field of sampling points with equal intervals using method of moments, and then inferred expressions of Padé rational function. After calculating the zero-pole points of the Padé rational function, we eventually got the estimation of the RRI’s generalized resonant frequency. Our case studies indicate that the proposed estimation method is effective for predicting the generalized resonant frequency of RRI in medium frequency (MF, 0.3~3 MHz) band over 1.7 MHz, which expands the frequency band studied by IEEE.

Study on the Drive Parameters of a High-precision Basis Weight Control Valve

Bo Wang, Wei Tang,Jixian Dong,Feng Wang 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.3

Decreasing precision or mechanical damage may occur in basis weight valves because of excess design torque valves. Stepping motor driver current values are set at the rated motor current or are based on practical experience. Applied technological research on current setting values was conducted in this paper. A current-setting experimental device was developed to solve this problem. The drive parameters include the drive current value, mechanical strength of valve actuator and the state holding current value were tested. Finally, the acceleration time for the trapezoidal velocity curve was calculated, which was helpful to improve the positioning precision of the valve. The test result with a sample diameter of a DN125 basis weight valve showed that the reasonable current value stage was 3.71 A, and the state holding current value stage was 50%. Then, the acceleration and deceleration times of the trapezoidal velocity curve were both set at 0.01 seconds. The positioning precision was able to match the requirements of a basis weight control valve for 10,000 steps in which an error of 1 step was less than 5.0% during 10,000 positioning steps under such drive parameters.

Resonant Frequency Estimation of Reradiation Interference at MF from Power Transmission Lines Based on Generalized Resonance Theory

Tang Bo,Chen Bin,Zhao Zhibin,Xiao Zheng,Wang Shuang 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.3

The resonant mechanism of reradiation interference (RRI) over 1.7MHz from power transmission lines cannot be obtained from IEEE standards, which are based on researches of field intensity. Hence, the resonance is ignored in National Standards of protecting distance between UHV power lines and radio stations in China, which would result in an excessive redundancy of protecting distance. Therefore, based on the generalized resonance theory, we proposed the idea of applying model-based parameter estimation (MBPE) to estimate the generalized resonance frequency of electrically large scattering objects. We also deduced equation expressions of the generalized resonance frequency and its quality factor Q in a lossy open electromagnetic system, i.e. an antennatransmission line system in this paper. Taking the frequency band studied by IEEE and the frequency band over 1.7 MHz as object, we established three models of the RRI from transmission lines, namely the simplified line model, the tower line model considering cross arms and the line-surface mixed model. With the models, we calculated the scattering field of sampling points with equal intervals using method of moments, and then inferred expressions of Pade rational function. After calculating the zero-pole points of the Pade rational function, we eventually got the estimation of the RRI’s generalized resonant frequency. Our case studies indicate that the proposed estimation method is effective for predicting the generalized resonant frequency of RRI in medium frequency (MF, 0.3~3 MHz) band over 1.7 MHz, which expands the frequency band studied by IEEE.

A Novel Data Retrieving Mechanism in Wireless Sensor Networks with Path-Limited Mobile Sink

Bo Tang,Jin Wang,Xuehua Geng,Yuhui Zheng,Jeong-Uk Kim 보안공학연구지원센터(IJGDC) 2012 International Journal of Grid and Distributed Comp Vol.5 No.3

Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials

Liu, Bo,Tang, Chaojun,Chen, Jing,Xie, Ningyan,Tang, Huang,Zhu, Xiaoqin,Park, Gun-sik Springer US 2018 NANOSCALE RESEARCH LETTERS Vol.13 No.1

<P>It is well known that a suspended monolayer graphene has a weak light absorption efficiency of about 2.3% at normal incidence, which is disadvantageous to some applications in optoelectronic devices. In this work, we will numerically study multiband and broadband absorption enhancement of monolayer graphene over the whole visible spectrum, due to multiple magnetic dipole resonances in metamaterials. The unit cell of the metamaterials is composed of a graphene monolayer sandwiched between four Ag nanodisks with different diameters and a SiO<SUB>2</SUB> spacer on an Ag substrate. The near-field plasmon hybridizations between individual Ag nanodisks and the Ag substrate form four independent magnetic dipole modes, which result into multiband absorption enhancement of monolayer graphene at optical frequencies. When the resonance wavelengths of the magnetic dipole modes are tuned to approach one another by changing the diameters of the Ag nanodisks, a broadband absorption enhancement can be achieved. The position of the absorption band in monolayer graphene can be also controlled by varying the thickness of the SiO<SUB>2</SUB> spacer or the distance between the Ag nanodisks. Our designed graphene light absorber may find some potential applications in optoelectronic devices, such as photodetectors.</P>

Hadoop MapReduce 성능 튜닝을 위한 매개변수 최적화 방법

당박(Tang Bo),최은만(Eun Man Choi) 한국정보과학회 2017 한국정보과학회 학술발표논문집 Vol.2017 No.12

쿠버네티스 기반의 마이크로서비스 시스템 가시화 연구

당박(Tang Bo),최은만(Eun Man Choi) 한국정보과학회 2018 한국정보과학회 학술발표논문집 Vol.2018 No.6

Wide-Awake Primary Flexor Tendon Repair, Tenolysis, and Tendon Transfer

Jin Bo Tang 대한정형외과학회 2015 Clinics in Orthopedic Surgery Vol.7 No.3

Tendon surgery is unique because it should ensure tendon gliding after surgery. Tendon surgery now can be performed under local anesthesia without tourniquet, by injecting epinephrine mixed with lidocaine, to achieve vasoconstriction in the area of surgery. This method allows the tendon to move actively during surgery to test tendon function intraoperatively and to ensure the tendon is properly repaired before leaving the operating table. I applied this method to primary flexor tendon repair in zone 1 or 2, tenolysis, and tendon transfer, and found this approach makes tendon surgery easier and more reliable. This article describes the method that I have used for tendon surgery.