Separating Overlapped Fingerprints

Fanglin Chen,Jianjiang Feng,Jain, A K,Jie Zhou,Jin Zhang IEEE 2011 IEEE transactions on information forensics and sec Vol.6 No.2

<P>Fingerprint images generally contain either a single fingerprint (e.g., rolled images) or a set of nonoverlapped fingerprints (e.g., slap fingerprints). However, there are situations where several fingerprints overlap on top of each other. Such situations are frequently encountered when latent (partial) fingerprints are lifted from crime scenes or residue fingerprints are left on fingerprint sensors. Overlapped fingerprints constitute a serious challenge to existing fingerprint recognition algorithms, since these algorithms are designed under the assumption that fingerprints have been properly segmented. In this paper, a novel algorithm is proposed to separate overlapped fingerprints into component or individual fingerprints. The basic idea is to first estimate the orientation field of the given image with overlapped fingerprints and then separate it into component orientation fields using a relaxation labeling technique. We also propose an algorithm to utilize fingerprint singularity information to further improve the separation performance. Experimental results indicate that the algorithm leads to good separation of overlapped fingerprints that leads to a significant improvement in the matching accuracy.</P>

The Interlaminar Mechanical and Impact Properties of Fibre Metal Laminates Reinforced with Graphene

Fanglin Cong,Shuo Wang,Linlin,Meng Cao,Zehui Jia,Zhiqiang Zhou,Xu Cui 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5

Glass fibre aluminium laminate (Glare) is widely used in various fields because of its excellent performance. However, its properties can be further enhanced by adding nanofillers, such as graphene, to the matrix. Graphene is a costeffectivetoughening agent because of its excellent specific strength, economy and good compatibility. The interlaminarmechanical and dynamic impact properties of Glare were improved by uniformly dispersed graphene (0, 0.2, 0.3, 0.5 and1.0 wt%). The interlaminar mechanical properties (short beam shear and single lap test) of the graphene-modified (0.5 wt%)Glare were increased by 42.24 % and 25.65 %, respectively, compared with the pure epoxy resin matrix. At a graphenecontent of 1.0 wt%, the Charpy impact energy and strength increased by 163.58 % and 126.33 %, respectively, and reachedthe maximum value. The microscopic images and schematic diagrams illustrated the toughening mechanism of graphene,including the enhancement of the aluminium/resin and fibre/resin interfaces and the performance of the resin matrix. Thetoughening of the resin matrix was achieved through the formation of a mechanical linkage between the graphene and thematrix, which indicated that more time and energy would be required to destroy it.

Synthesis, Characterization and Catalytic Properties of Monometal/SiO2 and Bimetal/SiO2 Hollow Spheres with Mesoporous Structure

Xinzhi Sun,Fanglin Du 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.12

Monometallic M1(M1 = Ni/Cu/Fe/Co) silicates and bimetallic Ni–M2(M2 = Cu/Fe/Co) silicates hollow spheres with mesoporous structure and the controllable morphology have been synthesized successfully via one-step sacrificial template method under hydrothermal conditions. The catalysts were obtained by reducing the corresponding silicates in situ under the hydrogen atmosphere at a certain temperature. All the silicates and the catalysts M1/SiO2 and Ni–M2/SiO2 hollow spheres have been characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) and temperature-programmed reduction (TPR) thoroughly and systematically. The morphology and reaction conditions of bimetallic Ni–M2 silicates hollow spheres depend on the second metal M2, which has been verified by SEM, TEM and XRD. From the results, it can be concluded that bimetallic silicates possess better physical properties in favor of the catalytic activity. Bimetallic Ni–M2/SiO2 hollow spheres had higher catalytic property than the monometallic M1/SiO2 and the conversion of nitrobenzene could reach 100% within 3 h using Ni–Cu/SiO2 and Ni–Fe/SiO2 hollow spheres as catalysts.

다차원 교육 정책 분석 모형을 활용한 초・중등 인공지능 교육 정책 분석

김인재,이득기,Shen, Fanglin,정제영 한국교육정치학회 2023 敎育政治學硏究 Vol.30 No.2

This study seeks the direction of Korea's AI education policy by analyzing elementary and secondary AI education policy based on the Four Dimensional Framework of Cooper Fusarelli, and Randall(2004). In the normative dimension, the cultivating AI talents and literacy, and personalized learning supports were analyzed. In the structural dimension, the AI-leading schools, AI convergence education schools, and infrastructure in schools were analyzed. In the constituentive dimension, government, metropolitan/provincial offices of education, teachers, and related institutions and companies were analyzed. The technical dimension was analyzed by curriculum, teacher training, educational environment, and institutional foundation. Based on the result, the implications for the stability of AI education are derived. First, a specific legal and institutional basis should be established. Second, the academic community's role should be expanded. Third, the provision of digital devices and education opportunities should be expanded. Fourth, the introduction of AI education should be accelerated by teachers learning communities including school principals. 인공지능의 대두와 코로나19로 인해 디지털 대전환이 가속화되며 사회 전반의 구조적 변화가 일어나고 있다. 이에 정부는 인공지능 시대에 대응하여 다양한 정책을 추진하고 있다. 본 연구는 Cooper, Fusarelli, 그리고 Randall(2004)의 다차원 교육 정책 분석 모형을 바탕으로 초・중등 인공지능 교육 정책을 분석함으로써 정책이 나아갈 방향을 종합적으로 모색하였다. 규범적 차원으로는 인공지능 인재 양성 및 인공지능 소양 함양, 맞춤형 교육 지원을 분석하였고, 구조적 차원으로는 AI교육선도학교, AI융합교육중심고와 학교 내 인공지능 교육 구현을 위한 인프라를 분석하였다. 구성적 차원에서는 중앙정부와 시・도교육청, 교원, 유관기관 및 기업을 분석하였고, 기술적 차원은 교육과정 운영, 교원 양성 및 연수, 교육환경 조성, 제도적 기반 마련으로 나누어 분석을 수행하였다. 분석 결과를 바탕으로 초・중등 인공지능 교육의 학교 현장 안착을 위한 시사점을 도출하였다. 첫째, 인공지능 융합교육이 활성화될 수 있는 구체적인 법적, 제도적 기반 마련이 필요하다. 둘째, 초・중등 인공지능 교육의 현장 도입을 위해 학회와 연구소, 교원단체를 비롯한 전문가들로 구성된 학문공동체 차원의 역할이 확대되어야 한다. 셋째, 디지털 격차를 해소하기 위한 디지털 기기 보급과 교육기회 확대의 노력이 필요하다. 넷째, 학교 내 인공지능 교육 도입은 교사 개인이 아닌 학교장을 비롯한 교원학습공동체를 통해 추진되어야 한다.

다차원 교육정책분석 모형을 활용한 초·중등 인공지능 교육 정책 분석

김인재,이득기,Shen, Fanglin,정제영 한국교육행정학회 2022 한국교육행정학회 학술연구발표회논문집 Vol.2022 No.12

A method of optimum design based on reliability for antenna structures

Chen, Jianjun,Wang, Fanglin,Sun, Huaian,Zhang, Chijiang Techno-Press 1999 Structural Engineering and Mechanics, An Int'l Jou Vol.8 No.4

A method of optimum design based on reliability for antenna structures is presented in this paper. By constructing the equivalent event, the formula is derived for calculating the reliability of reflector accuracy of antenna under the action of random wind load. The optimal model is developed, in which the cross sectional areas of member are treated as design variables, the structure weight as objective function, the reliability of reflector accuracy and the strength or stability of structural elements as constraints. The improved accelerated convergence gradient algorithm developed by the author is used. The design results show that the method in this paper is feasible and effective.

Multibiometrics fusion using Aczel-Alsina triangular norm

( Ning Wang ),( Li Lu ),( Ge Gao ),( Fanglin Wang ),( Shi Li ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.7

Fusing the scores of multibiometrics is a very promising approach to improve the overall system`s accuracy and the verification performance. In recent years, there are several approaches towards studying score level fusion of several biometric systems. However, most of them does not consider the genuine and imposter score distributions and result in a higher equal error rate usually. In this paper, a novel score level fusion approach of different biometric systems (dual iris, thermal and visible face traits) based on Aczel-Alsina triangular norm is proposed. It achieves higher identification performance as well as acquires a closer genuine distance and larger imposter distance. The experimental tests are conducted on a virtual multibiometrics database, which merges the challenging CASIA-Iris-Thousand database with noisy samples and the NVIE face database with visible and thermal face images. The rigorous results suggest that significant performance improvement can be achieved after the implementation of multibiometrics. The comparative experiments also ascertain that the proposed fusion approach outperforms the state-of-art verification performance.

Phtotoelectrochemical water oxidation to H2O2 based on N-TiO2 derived from NH2-MIL-125 and in-situ application on degradation dye

Kunpeng Liu,Nan Wang,Jianhua Li,Fanglin Du,Baorong Hou,Ruiyong Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-

Electrochemical two-electron water oxidation reaction (2e WOR) to produce H2O2 has been widely concerned. However, four-electron competition reaction causes the large overpotential and low productionrates of 2e WOR, which restrict its’ development and application. Herein, we prepared N-TiO2 derivedfrom NH2-MIL-125 by the hydrothermal combined with calcination method. We found that N-TiO2 asphotoanode exhibited the well properties of photoelectrocatalysis water oxidation, which gave an overpotentialof 630 mV at 1 mA cm2. The overpotentials of N-TiO2 was approximately 130 mV (at1 mA cm2) lower than NH2-MIL-125, and even lower than the previous reported TiO2, which may attributeto the increased oxygen vacancy with the calcination process and N doping. In addition, we investigatedthe degradation performance of the prepared catalysts to degrade methylene blue byphotoelctrocatalysis on-site the preparation of H2O2. It was shown that N-TiO2 performed high degradationefficiency (91%) and excellent stability. The possible mechanism was speculated due to theincreased oxygen vacancy and N doping. This work provides a new idea for photoelectrocatalysis wateroxidation materials and points out a new way for on-site H2O2 production for direct use

IGCT Self-Protection Strategy for IGCT Converters

Hong Zeng,Xiulin Chen,Yongmin Chen,Xuejun Pan,Shunbiao Zhang,Fanglin Chen,Wenbin Zeng 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

The high-power semiconductor IGCT is widely used in two-level or three-level IGCT converters and for these converters a comprehensive system-protection strategy may be used to protect the IGCT. But there are still some problems resulted from signal transmission delays, such as incorrect timing, low response speeds, second breakdown and those problems can result in IGCT overload failure, bridge-arm shoot-through and other consequences. In this paper, the anode voltage and current parameters gained from the IGCT device are studied as protection reference in a new GCT gate drive unit. The gate drive unit can control and process the signal logic, and execute safe and reliable switching action. The signal is simultaneously feed back to the host computer in IGCT converters to perform the switching control of other devices. This new gate unit can effectively reduce device failure rates and improve the reliability of IGCT converters systems, while reducing operating costs.

DDAB-MODIFIED TPGS-b-(PCL-ran-PGA) NANOPARTICLES AS ORAL ANTICANCER DRUG CARRIER FOR LUNG CANCER CHEMOTHERAPY

TIEJUN ZHAO,HEZHONG CHEN,LIXIN YANG,HAI JIN,ZHIGANG LI,LIN HAN,FANGLIN LU,ZHIYUN XU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.2

Oral chemotherapy is a great way to cancer treatment because it is less stressful being that the patient will have less hospital visits and can still maintain a close relationship with health care professionals. In this research, three types of nanoparticle formulation from commercial PCL and self-synthesized TPGS-b-(PCL-ran-PGA) diblock copolymer were fabricated for oral delivery of antitumor agents, including DDAB-modified PCL nanoparticles, unmodified TPGS-b-(PCL-ran-PGA) nanoparticles and DDAB-modified TPGS-b-(PCL-ran-PGA) nanoparticles. Firstly, the TPGS-b-(PCL-ran-PGA) diblock copolymer was synthesized and characterized. DDAB was adopted to increase retention time at the cell surface, thus increasing the chances of nanoparticle uptake by the gastrointestinal mucosa and improving drug absorption. The TPGS-b-(PCL-ran-PGA) nanoparticles were found by FESEM of spherical shape and around 200 nm in diameter. The surface charge of TPGS-b-(PCL-ran-PGA) nanoparticles was reversed from anionic to cationic after DDAB modification. The DDAB-modified TPGS-b-(PCL-ran-PGA) nanoparticles have significantly higher level of the cell uptake than that of DDAB-modified PCL nanoparticles and unmodified TPGS-b-(PCL-ran-PGA) nanoparticles. In vitro cell viability studies showed advantages of the DDAB-modified TPGS-b-(PCL-ran-PGA) nanoparticles over Taxotere® in terms of cytotoxicity against A549 cells. In conclusion, oral chemotherapy by DDAB-modified TPGS-b-(PCL-ran-PGA) nanoparticle formulation may provide a promising outcome for lung cancer patients.