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An Analysis of Internet Censorship Circumvention Techniques
Tianbo Lu,Jinyang Zhao,Lingling Zhao,Yang Li,WanJiang Han 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.5
Since Internet was born, it has deeply influenced almost every aspects of people’s life. However, at the mean time when people enjoy the convenience brought by the Internet, there is censorship existed every corner of the internet world. Censorship circumvention technique to protect people’s communication against censors. During the past decades, anti-censorship techniques have a broad and extensive development, however not all of the censorship circumvention techniques have effect in circumvent the censors and there is still not a very useful and convenient technique to ensure the anonymity of internet communication. In this paper, we tried to analyze the current situation of censorship and anti-censorship techniques and give a comprehensive view on the censorship circumvention techniques and systems.
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Numerical Simulation of Temperature Effects on Mechanical Behavior of the Railway Tunnel in Tibet
Shouhua Liu,Jinyang Fu,Junsheng Yang,Han Feng 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.12
Under the influence of plate collision, the high geothermal is a widespread phenomenon within the region of Tibet. Due to the aforementioned high geothermal, lining cracking is a common disaster in Sangzhuling tunnel during construction period. This paper presented the mechanical behaviour of tunnel lining under high geothermal temperature, which is studied by thermo-mechanical numerical method. The results both from field investigation and numerical analysis demonstrate that high geothermal temperature can cause the tunnel lining cracking and the variation of the stress of the tunnel lining. Thus, a novelty sandwich composite lining supporting scheme is proposed to overcome such geothermal temperature effects, in which a thermal insulation layer between primary supporting and secondary supporting is designed. The numerical analysis results indicate that the insulation layer can significantly improve the mechanical characteristics of the lining structure. In addition, the effect of the insulation layer is not linear with its thickness. For this reason, the optimuminsulation thickness of the insulation layer is chosen as 0.06 m, which was optimized by a numerical parametric analysis. The research can provide a reliable reference for tunnelling works in high geothermal regions.
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Zhiqiang Liu,Ming Chen,Jinyang Xu,Shu Han 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
This paper presents a new flexible method referring to coupling response surface methodology (CRSM) to acquire optimum cutting parameters in machining of difficult-to-cut titanium alloy under minimum quantity lubrication (MQL) condition. Cutting speed, feed rate and depth of cut are designed as three factors by using the Taguchi method, which are also subject to several constraints including processing efficiency, cutting force and surface quality. In addition, turning experiments of titanium alloy were performed in order to set up the model based on Taguchi experimental design and multiple regression method. ANOVA was carried out to prove the adequacy of the developed mathematical model and the influences of cutting parameters on constraints were also observed. The results indicated that the feed rate was the dominant factor affecting surface roughness and cutting forces, which were minimized when the feed rate and depth of cut were set to the lowest level, while cutting speed was set to the highest level. Moreover, the predicted values obtained by CRSM were in good agreement with the experimental values, which indicated that CRSM was an effective method to determine optimum cutting conditions for machining process under MQL condition.
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진양명숙 ( Myong Suk Jinyang ),한유석 ( Yu Seok Han ) 전북대학교 인문학연구소 2015 건지인문학 Vol.13 No.-
This paper analyzes the historical origin, process of transformation, and characteristics of Jeonju Bibimbap through the investigation of historical evidence and indepth interviews with the owner/chefs of several Bibimbap restaurants. This paper is comprised of two main chapters. In the first chapter, we divide the historical transformation of Jeonju Bibimbap into three periods. We define the beginning period as having taken place during the Japanese colonial era, when Bibimbap was sold at Nambu market. The second period extends from the 1950-80s, when professional restaurants began appearing and developing. The third period begins in the 1990s, when efforts were made for the commercialization and globalization of Jeonju Bibimbap. In the second chapter, we identify the three characteristics of Jeonju Bibimbap. The characteristics are the use of bean sprouts as the main ingredient, the variety of recipes among professional restaurants, and the plentiful and varied side dishes, which represent a spirit of generosity.
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Ying Zhong,Weichao Li,Liang Zhou,Chen Deng,Jinyang Han 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.2
The capacity and equivalent switching frequency of parallel interleaved inverters can be increased, but there are problems with neutral point potential balance and parallel bridge circulating current. This paper regards the parallel three-level inverter as a five-level inverter and five-level space vector integrated modulation is applied. On this basis, a neutral-point potential control strategy based on the mid-point charge to calculate the adjustment factor k is proposed. By further meticulously partitioning specific sector regions, the selection method of redundant vectors in the switching sequence is optimized without increasing the switching times, and the midpoint voltage ripple is reduced. Then, the redundant state allocation in the process of splitting the five-level into three-level is used as a new degree of freedom to suppress the circulating current of the parallel bridge, therefore realizing the control of voltage and current sharing. Finally, simulation and experiments verify the correctness and effectiveness of the method.
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