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( Liling Cao ),( Andwancheng Ge ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.9
Signcryption is a cryptographic primitive that provides authentication (signing) and confidentiality (encrypting) simultaneously at a lower computational cost and communication overhead. With the proposition of certificateless public key cryptography (CLPKC), certificateless signcryption (CLSC) scheme has gradually become a research hotspot and attracted extensive attentions. However, many of previous CLSC schemes are constructed based on time-consuming pairing operation, which is impractical for mobile devices with limited computation ability and battery capacity. Although researchers have proposed pairing-free CLSC schemes to solve the issue of efficiency, many of them are in fact still insecure. Therefore, the challenging problem is to keep the balance between efficiency and security in CLSC schemes. In this paper, several existing CLSC schemes are cryptanalyzed and a new CLSC scheme without pairing based on elliptic curve cryptosystem (ECC) is presented. The proposed CLSC scheme is provably secure against indistinguishability under adaptive chosen-ciphertext attack (IND-CCA2) and existential unforgeability under adaptive chosen-message attack (EUF-CMA) resting on Gap Diffie-Hellman (GDH) assumption and discrete logarithm problem in the random oracle model. Furthermore, the proposed scheme resists the ephemeral secret leakage (ESL) attack, public key replacement (PKR) attack, malicious but passive KGC (MPK) attack, and presents efficient computational overhead compared with the existing related CLSC schemes.
Liling Cao,Wancheng Ge 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.10
Authentication with key agreement (AKA) protocols are implemented to provide identity authentication and session keys for communication entities. In order to reduce the heavy trust reliance on key generator center (KGC) in identity based AKA protocols, a certificateless based AKA (CLAKA) protocol for client-server environment without the third-party (i.e., KGC) is introduced in this paper. The proposed protocol is constructed based on elliptic curve cryptosystem (ECC) and multi-factor protections (such as password, biometrics, and smart card). Moreover, security proof based on BAN-logic is carried out and shows that our protocol can provide mutual authentication, user anonymity, dynamic identity and perfect forward security, and resist to user impersonation attack, server spoofing attack and privileged insider attack. Meanwhile, security and efficiency analysis shows that our proposed protocol outperforms the previous related ones.
중국 패션잡지「상하이스타일(上海服飾)」에 나타난 패션스타일
황려령 ( Liling Huang ),하지수 ( Ji Soo Ha ) 한국의류산업학회 2016 한국의류산업학회지 Vol.18 No.2
Research on changes of Chinese women’s fashion styles was conducted through analysis of fashion images and articles in Chinese fashion magazines since 1980s. Through the fashion magazine research centered on Shanghai, the most developed commercial city having a great influence on the entire fashion industry in China, it examined Chinese fashion styles by period so identified a developmental process of Chinese fashion styles. Based on general understanding of Chinese fashion magazine industry, case study was conducted on 「Shanghai Style(上海服飾)」. After analyzing 1100 fashion images by period derived from 245 volumes from 1985 to 2013, this study compared fashion styles in 4 periods and analyzed the developments of Chinese fashion styles. Findings from the case analysis based on the classification of fashion styles are as follows. In the early editions, images to give a visual stimulus and express styles more intuitively were frequently used with reported articles. As for the general change of the style in 「Shanghai Style(上海服飾)」, expression was done centered on casual wear with gradual disappearance of formal wear. There was a tendency entire atmosphere of the style became romantic. Through a comparative analysis between Chinese fashion styles having such developmental characteristic and the global fashion trends, this study identified special characteristics of Chinese fashion style changes. As for common characteristics, firstly, both have a tendency to change into the coexistence of various styles rather than popularity of certain style. Secondly, style was expressed gradually centered on casual wear.
Fault-Tolerant Control Based on Modified eXogenous Kalman Filter for PMSM
Ma Liling,Wang Fuxiang,Shen Wei,Wang Junzheng 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2
Aiming at the encoder fault of the three-phase permanent magnet synchronous motor control system, a modified eXogenous Kalman Filter (MXKF) is proposed. When there are errors in the initial state of the estimator, MXKF performs well while extended Kalman Filter leads to an unstable state of the system. For the system under the Three-phase Four-switch drive, MXKF is shown to have better fault-tolerant stability. In addition, to avoid the unexpected equilibrium points determined by the q-axis voltage equation, proper compensation is made in the filter. Finally, simulations have been done to verify the effectiveness of the proposed method in the following two cases: start-up with initial error and topology change of the drive. The results show the satisfying superiority of MXKF.
ノンネイティブ日本語教師研修の史的変遷とその課題 ― 国際交流基金による教師研修の目的に注目して ―
成利楽 ( Cheng Lile ) 한국일어교육학회 2022 일본어교육연구 Vol.- No.61
本研究は,日本国外で日本語教育を担っている主力であるノンネイティブ日本語教師を対象とする教師研修の史的変遷とその課題を探ることを目的とする。そのため,主な担当機関である国際交流基金が実施した研修を報告した論考を分析材料とし,その研修目的に着眼しながら,これまでのノンネイティブ日本語教師研修の史的変遷を辿った。KH Coderで共起ネットワークを構築したところ,全体的に日本語力,文化関連知識·能力と教授能力の開発が中心的な目的であったことがわかった。また,年代ごとのネットワークを確認した結果,1990年代は日本語運用能力の向上,日本文化,異文化理解の促進や日本語教授法の体験,2000年代は協働と内省による教師の意識開発,2010年代は省察的実践力の育成,2020年代は教師の深い学びの実現といった研修目的が中心であった。この結果を母語話者日本語教師教育の言説と比較することで,非母語話者教師を対象とする研修が日本国内における母語話者日本語教師研究からの影響を受けた可能性があるという課題の発見に至った。それに対して,今後非母語話者教師の養成体制や成長課題を考慮した上での教師研修の必要性について提言した。 The purpose of present study is to explore the historical trends and issues in teacher training for non-native Japanese language teachers(NNT) outside of Japan. As for the method, research of teacher training about NNTs from the 1990s were collected and analyzed from the perspective of training purposes. A keywords network for each age group was constructed by KH Coder. As a result, Japanese language proficiency, culture-related knowledge and skills, and teaching skills were the central objectives of these training sessions. The main objectives of the training 1) in the 1990s were to improve Japanese language skills, promote understanding of cultures, and experience teaching methods; 2) in the 2000s, to develop teachers' awareness through collaboration and reflection; 3) in the 2010s, to develop reflective practice skills; and 4) in the 2020s, to realize deep learning for teachers. A comparison of these results with the discourse about Japanese teacher education led to the inference that training activities for NNTs may have been influenced by the discourse of native speaker teacher education in Japan. In response, we propose the need for future teacher training that considers training system of NNT and their professional development challenges.
Pump Wavelength Dependence of Photodarkening in Yb-Doped Fibers
Huizi Li,Liling Zhang,Sidharthan, Raghuraman,Ho, Daryl,Xuan Wu,Venkatram, Nalla,Handong Sun,Tianye Huang,Seongwoo Yoo IEEE 2017 Journal of Lightwave Technology Vol.35 No.13
<P>Photodarkening in Yb-doped fibers is known to be dependent of Yb population inversion. In addition to this dependence, we report that pump wavelength selection plays a significant role in photodarkening dynamics. It is found that 976 nm pump source can lead to more severe photodarkening effects than 916 nm pumping at the same inversion levels. This observation is consistent in Yb-doped fibers with various compositions. Our work reveals pump wavelength is another determinant factor of photodarkening besides the inversion level and emphasizes the importance of pump wavelength selection in high power Yb-doped fiber lasers and amplifiers.</P>