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An Efficient Revocable Group Signature Scheme in Vehicular Ad Hoc Networks
( Zhen Zhao ),( Jie Chen ),( Yueyu Zhang ),( Lanjun Dang ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.10
Although many revocable group signature schemes has been proposed in vehicular ad hoc networks (VANETs), the existing schemes suffer from long computation delay on revocation that they cannot adapt to the dynamic VANETs. Based on Chinese remainder theorem and Schnorr signature algorithm, this paper proposes an efficient revocable group signature scheme in VANETs. In the proposed scheme, it only need to update the corresponding group public key when a member quits the group, and in the meanwhile the key pairs of unchanged group members are not influenced. Furthermore, this scheme can achieve privacy protection by making use of blind certificates. Before joining to the VANETs, users register at local trusted agencies (LTAs) with their ID cards to obtain blind certificates. The blind certificate will be submitted to road-side units (RSUs) to verify the legality of users. Thus, the real identities of users can be protected. In addition, if there is a dispute, users can combine to submit open applications to RSUs against a disputed member. And LTAs can determine the real identity of the disputed member. Moreover, since the key pairs employed by a user are different in different groups, attackers are not able to track the movement of users with the obtained public keys in a group. Furthermore, performance analysis shows that proposed scheme has less computation cost than existing schemes.
VLBI NETWORK SIMULATOR: AN INTEGRATED SIMULATION TOOL FOR RADIO ASTRONOMERS
ZHEN ZHAO,Tao An,BAOQIANG LAO 한국천문학회 2019 Journal of The Korean Astronomical Society Vol.52 No.5
In this paper we introduce a software package, the Very long baseline interferometry Network SIMulator (VNSIM), which provides an integrated platform assisting radio astronomers to design Very Long Baseline Interferometry (VLBI) experiments and evaluate the network performance, with a user-friendly interface. Though VNSIM is primarily motivated by the East Asia VLBI Network, it can also be used for other VLBI networks and generic interferometers. The software package not only integrates the functionality of plotting (u; v) coverage, scheduling the observation, and displaying the dirty and CLEAN images, but also adds new features including sensitivity calculations for a given VLBI network. VNSIM provides flexible interactions on both command line and graphical user interface and offers friendly support for log reports and database management. Multi-processing acceleration is also supported, enabling users to handle large survey data. To facilitate future developments and updates, all simulation functions are encapsulated in separate Python modules, allowing independent invoking and testing. In order to verify the performance of VNSIM, we performed simulations and compared the results with other simulation tools, showing good agreement.
LANDSAT 위성영상을 이용한 과거 35년간 두만강 하구 해안선 변화 연구
Zhao,Yuwei,Xu, Zhen,Zhao,Shuqing,이동근 한국환경복원기술학회 2024 한국환경복원기술학회지 Vol.27 No.3
Coastline changes evolution of different intensities at all times under the influence of natural and anthropogenic effects. In this paper, we extracted the coastline of the Tumen River estuary from 1985 to 2020 using the digitizing method, verified the accuracy using the visual interpretation results, and analyzed the changes of the coastline of the Tumen River estuary through the area method and the baseline method. The results showed that the coastline showed an erosion trend during 35 years, with an average erosion rate of 0.05 m/year, an average erosion distance of 3.06 m, and an erosion area of 19.25 ha. Among the human activities that retarded the erosion of the coastline, these activities had a long-term impact on the natural morphology of the coastline.
The influence of audio visual language on film style : Focused on the Work His and her spring
Zhao Zhen,Junghyen kim,Surng Gahb Jahng 중앙대학교 영상콘텐츠융합연구소 2021 TechArt :Journal of Arts and Imaging Science Vol.8 No.4
Film category is the most basic image form of film. The reason for the difference of the basic types of films is that, as for the ontological characteristics of art, films use audio-visual language to form image narrative methods and attributes. Family movies, which focus on exploring family emotions, are usually simple and touching, concerned about society, introspective and reflective, and full of humanism. With objective lens to record the ordinary life of the characters in the play, taking the social hot events as the blueprint, integrating the directors own understanding and feeling of life, magnifying the story of the little people in the big historical background, and infiltrating the philosophy and connotation of life into the description of the daily life of the family. Taking the short film His and her spring as an example, this paper analyzes and summarizes the influence of picture and sound design on film style from the aspects of work introduction, lens design and social influence. The core of the article is the impact of documentary style family films similar to his and her spring on the society, as well as the humanistic emotion and social care of such family films.
Analysis of Sino-American Culture in Disney Animation Mulan
ZHAO ZHEN 한국콘텐츠학회(IJOC) 2021 International Journal of Contents Vol.17 No.1
This article takes Disney animation 〈Mulan(1998)〉as the research object to analyze the Chinese and American culture in the animation. The first part introduces the background of the animation. The theme of the animation comes from the long-standing narrative folk song Mulan Ci during the Southern and Northern Dynasties of China, and it introduces the parallel montage of animation narrative. The second part narrates the Chinese cultural elements in Mulan, and expounds on Disneys use and blending of Chinese cultural elements from three aspects of ink painting effect, national costumes and Confucianism. From the perspective of Western culture, the third part analyzes how to integrate Western thought and characteristics, and contrast with Chinese culture in Mulan from three aspects: Mushu, character and hierarchy.
Automatic Configuration Method for the IKE Protocol based on X.509
( Zhen Zhao ),( Kwang Sun Ko ),( Young Ik Eom ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.1
The Internet Key Exchange (IKE) protocol is most widely used as a security key exchange protocol on the Internet. Security policies used by the IKE protocol must be configured in advance, however the complex options and manual settings cause inconvenience. This paper proposes an automatic configuration method for the IKE protocol based on X.509 certificate. Security policies are embedded in the certificate, read, and added into the IKE configuration file by a negotiation assistant module in order to achieve automatic IKE configuration. Our proposed method reduces the complexity of configuration process and improves the adaptability of the IKE protocol.
Zhen Qing Zhao,Ping Wu Liu,Guang Sheng Yang 한국유전학회 2008 Genes & Genomics Vol.30 No.3
Polima (Pol) system of cytoplasmic male sterility (CMS) has been widely used for hybrid breeding in Brassica napus L in China. Molecular markers tightly linked to the restorer gene would be not only a valuable tool for breeding new restorer lines but also important landmarks for cloning the gene based on the linkage map. In order to identify DNA markers linked to its restorer gene ( Rfp), a near-isogenic line (NIL) population segregating for male sterility ( rfprfp) /fertility ( Rfprfp) was subjected to amplified fragment length polymorphism (AFLP) analysis using the bulked segregant analysis (BSA) method. From the survey of 2,560 primer combinations, nine AFLP markers tightly linked to the target gene were identified. The distance between the two closest markers (ZQA and ZQH) and the target locus were both 0.4 cM, but they located at the same side of the Rfp locus. To exploit fast, cheap and reliable PCR-based markers for large-scale application in marker-assisted selection (MAS), polymorphic fragments of these two AFLP markers were sequenced and successfully converted into sequence characterized amplified region (SCAR) markers. This suite of markers could be valuable in developing new elite restorers in rapeseed.
Analysis of the Threats abusing IPv6 Fragment Header
( Zhen Zhao ),( Gyehyeon Gyeong ),( Kwang Sun Ko ),( Young Ik Eom ) 한국정보처리학회 2007 한국정보처리학회 학술대회논문집 Vol.14 No.1
The security issues related to IPv6 protocol have been focused on by many researchers and engineers. Especially, extension headers of IPv6 protocol provide various functionalities such as IP security, mobile IP, and in principle, it is said to give much more effective network services than the previous protocol, IPv4. In this paper, the cases are surveyed in which fragment header, that is one of many extension headers in IPv6 protocol, is abusedand made to be the sources of threats. Prevention mechanisms are also surveyed to countermeasure the threats.