A Game theoretic analysis of public goods allocation in p2p networks

( Qingfeng Zhang ),( Sheng Wang ),( Dan Liao ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.8

This paper presents a game theoretic approach to analyze the public goods (PGs) allocation in peer-to-peer (p2p) networks. In order to reduce the free-riders and promote the cooperation among peers, we propose an incentive mechanism with cooperation-based game theory. In this paper, we regarded the contributed resources by cooperators as public goods (PGs). We also build the PGs allocation in P2P networks to be the optimization problem, and the optimal solution of PGs allocation satisfies the Bowen-Lindahl-Samuelson equilibrium. Firstly, based on the subscriber mechanism, we analyze the feasibility and prove the validity, which can achieve Nash equilibrium. However, this strategy cannot meet to Bowen-Lindahl-Samuelson equilibrium as the free-riders do not pay with their private goods for consuming the PGs. Secondly, based on the Walker mechanism, we analyze the feasibility and prove the validity for the same allocation problem, which meets to Bowen-Lindahl-Samuelson equilibrium and achieves Pareto efficiency within cooperative game. Simulations show that the proposed walker mechanism can significantly improve the network performance of throughout, and effectively alleviate free-riding problem in P2P networks.

Efficacy and Safety of Anti-Tumor Necrosis Factor- Alpha Agents for Patients with Intestinal Behcet’s Disease: A Systematic Review and Meta-Analysis

Qingfeng Zhang,Chunyan Ma,Rongrong Dong,Weizhen Xiang,Meiqi Li,Zhenzhen Ma,Qingrui Yang 연세대학교의과대학 2022 Yonsei medical journal Vol.63 No.2

Purpose: Intestinal Behcet’s disease (BD) is a systemic autoimmune disease for which treatment options are limited. As a prospectivetherapeutic strategy for intestinal BD, anti-tumor necrosis factor-alpha (anti-TNF-α) agents have received increasing attention. In this study, we conducted a systematic review and meta-analysis to evaluate the efficacy and safety of anti-TNF-αagents for patients with intestinal BD. Materials and Methods: We searched PubMed, Embase, and Cochrane Library databases up to July 1, 2021 and articles that metthe eligibility criteria were further assessed. Pooled rates were synthesized by a randomized effects model using Stata software. Results: Eleven clinical trials covering 671 patients with intestinal BD were included. According to compositive data, the pooledrate for remission was 39% [95% confidence interval (CI) 26–52] in patients receiving anti-TNF-α agents. Intestinal symptomswere cured in 70% (95% CI 53–84) of the patients, and the rate for endoscopic healing was 65% (95% CI 52–78). Corticosteroid discontinuationwas achieved in 43% (95% CI 28–58) of the patients, and the dose reduction of corticosteroid was 20.43 mg (95% CI13.4–27.46). There were 239 adverse events and 80 serious adverse events during follow-up. Conclusion: Our study indicated that anti-TNF-α agents may serve as an effective treatment with acceptable safety for patientswith intestinal BD. However, more robust evidence from randomized controlled trials is urgently needed to assess the long-termefficacy and safety of anti-TNF-α agents for those patients.

Developing Self-adaptive Software System : A Case Study

Qingfeng Zhang,Jing Xu,Chao Zhang 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.4

Current trends in software system, such as cloud and big data platform, are leading to rapid and continuing changes. At the same time, these systems will have to react to these changes at runtime to satisfy the potential Quality of Service (QoS). Self-adaptation is recognized as a practical way for a software system to meet QoS requirements. The Development of self-adaptive software is generally more challenging and more difficult due to their high complexity. To address these challenges, this paper reviews the related research of self-adaptive software system and reports a case study that investigates a self-adaptive concurrency controller for database system. Through the case we illustrate how to develop a self-adaptive software system. Compared with other traditional method, the experimental results demonstrate that our self-adaptive controller can effectively improve the database performance by adjusting the MPL value based on workload changes and QoS requirements. Finally some future trends in this area are prospected and discussed.

뉴미디어 환경에서의 중국 We-Media 컨텐츠 저작권 침해에 관한 연구

장경풍 ( Qingfeng Zhang ),양레이 ( Lei Yang ) 사단법인 아시아문화학술원 2021 인문사회 21 Vol.12 No.6

오늘날 누구나 콘텐츠를 제작하고 배포할 수 있는 미디어 환경 속에서 저작권의 침해라는 부정적 면이 만연해 있음을 부정할 수 없다. 미디어 산업의 관점에서, 중국은 현재 세계에서 가장 빠르게 성장하고 있는 나라이다. 그러나 기술에 뒤쳐진 법체계와 We-media 운영 플랫폼의 자유방임적인 분위기로 인해 저작권 침해자들에 대한 법적 인식은 취약하다. 더욱이 We-media 콘텐츠 저작권자들은 자신의 저작권 침해에 대한 구제를 받기 위해 장기간의 절차와 높은 비용을 감수해야 하므로 효과적인 저작권 보호를 받기 어렵다. 본 연구는 문헌조사 방식을 사용하여 중국 We-media 산업의 발전 현황과 We-media 콘텐츠 저작자가 겪는 권리침해를 이론적, 실무적으로 분석하고 몇 가지 제안을 도출하였다. 정부 부처와 사회가 함께 할 수 있는 저작권보호 메커니즘을 모색하고, 저작권제도의 통일화 작업 등 추가적 개선을 촉구한다. 특히 정부는 We-media 콘텐츠 저자의 권리 보호를 개선하고, 권리침해를 효과적으로 통제하기 위하여, 저작권 침해에 대한 감독을 강화하여야 할 뿐만 아니라, 저작권 침해에 대한 교육을 강화할 필요가 있다. 미디어 콘텐츠 산업에 대한 건전성 규제를 통해 전세계 We-media 콘텐츠 저자들의 창의적 열정을 증가시킬 것이다. In a new media environment where everyone can produce and distribute content, copyright infringement has become widespread worldwide. From the perspective of the media industry, China is currently the fastest growing country in the world. However, due to the law lags behind technology and the laissez-faire mode of the we-media operating platform, which refers to online information sharing by mainly individuals, the legal awareness of copyright infringers is weak. Furthermore, we-media content authors face high costs and prolonged processes when fighting against copyright infringements, and it is difficult for the infringed to take effective copyright protection measures. This research uses the literature survey method to analyze the development status of China’s we-media industry and the infringements suffered by we-media content authors in theory and practice and puts forward relevant suggestions. It is suggested that government departments and society should jointly explore protection mechanisms, further improve the copyright system into systematic, unifying regulation. The government should strengthen the supervision of we-media platforms and improve the knowledge of copyright infringement and rights protection of we-media content authors to restrict the occurrence of infringements. The healthy regulation of the media content industry will increase the creative enthusiasm of we-media content authors worldwide.

The Effects of Plant Colors on Alleviating Anxiety in College Students

Yan Jin,Qingfeng Zhang 사단법인 한국융합기술연구학회 2024 아시아태평양융합연구교류논문지 Vol.10 No.3

The mental health issues of college students have received widespread attention in recent years, and improving the campus environment plays a significant role in aiding the mental and physical health of college students. Plant color, as the most intuitively perceivable element of the environment, has a direct impact on individuals' mental and physical health; Therefore, investigating the impact of different colors of plants on the psychological health of university students holds significant importance for providing a theoretical basis for the construction of restorative landscape environments on college campuses. This study utilized online questionnaires and invited participants to view plants of different colors (yellow, red, white, green, and black), assessing their psychological impact through various psychological indices. The results indicated that green plants significantly alleviate feelings of tension, unease, and sorrow; white plants have a notable restorative effect on feelings of tension and unease; yellow plants significantly reduce unease and worry; and black plants have a significant restorative effect on unease. Therefore, in the construction of campus landscapes, it is advisable to plant a large number of green and white plants, complemented by yellow plants, to effectively improve the psychological health of college students.

Experimental Study on the Effect of Black Shales and Water Interactions on Concrete

( Xin Liao ),( Qingfeng Wang ),( Sixiang Ling ),( Xiyong Wu ),( Wenda Zhang ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2

Black shales, usually containing pyrite, are easily oxidized and generate acidic porewater. This acidic environment is non favorable for tranditional engineering material, e.g., concrete, and is likely to affect the durability of the engineering structure. This study investigated the corrsions of concrete by acid water from black shale at different immersion depth. Electrical conductivity (EC) and pH values of the solution were monitored at intervals. Concentrations of major ion species were determined for immersion solutions. Micro-fissure development within the rock and concrete samples were determined by comparing the ultrasonic before and after the immersion tests. Mineral and strength analysis was conducted with X-ray diffraction and uniaxial compressive strength apparatus. The results indicate that: 1) capillary action was significant for the water-solid interactions of black shale and concrete, where the chemical reaction of black shale mainly occurred; 2) the immersion solution caused corrosion in the surface of black shale and concrete, which dramatically reduced the compressive strength of black shale but increased that of concrete slightly in the immersion period. This change can be attributed to the products formed by the chemical reaction between the sulfate-rich ion solution and concrete filled in pore structure.

Carbon Paper-Supported NiCo/C–N Catalysts Synthesized by Directly Pyrolyzing NiCo-Doped Polyaniline for Oxygen Reduction Reaction

Zhongliang Deng,Qingfeng Yi,Yuanyuan Zhang,Huidong Nie,Guang Li,Liang Yu,Xiulin Zhou 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.1

In this study, we report the findings that the C–N composites containing Ni and Co (Ni1Co1/C–N, Ni3Co1/C–N, Ni6Co1/C–N, Ni9Co1/C–N, Ni10Co0/C–N and Ni0Co10/C–N) can be produced by direct pyrolysis of the NiCo-doped polyaniline (PANI) precursors in N2 atmosphere at 800 ℃ and show efficient electroactivity for oxygen reduction reaction (ORR) in alkaline media. Distribution and compositions of the catalysts were characterized by SEM, TEM, EDS and XRD techniques. The catalysts were loaded on carbon paper to prepare gas diffusion electrodes, in which electrocatalytic activity for ORR in alkaline media was investigated by voltammetric techniques. The ORR current density on these carbon paper-supported NiCo/C–N catalysts exhibits a linear increase with the negative shift of ORR potential. The ORR onset potential is around 0.2 V (versus Ag/AgCl) in alkaline media. Among the prepared catalysts, the catalyst Ni6Co1/C–N presents the largest ORR current density, which is 68.5 mA cm -2@-0.8 V (versus Ag/AgCl) in alkaline media. Moreover, Ni6Co1/C–N catalyst also presents good electrocatalytic activity stability for ORR.

Fabrication of Cu2O/TiO2 nano-tube arrays photoelectrode and its enhanced photoelectrocatalytic performance for degradation of 2,4,6- trichlorophenol

Qiuling Ma,Huixuan Zhang,Yuqi Cui,Xiaoyong Deng,Ruonan Guo,Xiuwen Cheng,Mingzheng Xie,Qingfeng Cheng 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-

Cu2O decorated TiO2 nano-tube arrays (Cu2O/TiO2 NTAs) photoelectrode was fabricated throughelectrodeposition strategy. Meanwhile, physicochemical properties of the resulting photoelectrode weresystematically studied by series of measurements. Results indicated that Cu2O/TiO2 NTAs photoelectrodeperformed a significantly enhanced light absorbance in the visible region between 400 and 800 nm,transient photocurrent density of 0.162 mA Cm 2, photogenerated charge separation efficiency and 99.9%of photoelectrocatalytic efficiency for decomposition of 2,4,6-trichlorophenol within 120 min Xenonillumination with the help of +1.0 V (vs. SCE) potential. Furthermore, the enhanced visible lightresponsible photoelectrocatalytic mechanism was proposed and discussed.

Network Traffic Anomaly Detection Based on N-ARMA Model

Pingping Gu,Shijing Zhang,Zhimin Huang,Qingfeng Wu 보안공학연구지원센터 2016 International Journal of Database Theory and Appli Vol.9 No.11

With the rapid development of the Internet and the continuous expanding of the data network, little potential anomaly can seriously affect the normal operation of the network, and even lead to huge economic losses. In order to be more accurate and efficient in the traffic detection, in this paper, we propose an N-ARMA based traffic anomaly detection model. We also conduct extensive experiments to verify the higher accurate ratio and recall ratio of our model by comparing with other traffic anomaly detection methods.

Exploration and Study of Elderly-friendly Pharmaceutical Packaging Design:A Perspective of Realizing Barrier-free Communication of Drug Information through Digital Human

서경군(Qingjun Xu),장경풍(Qingfeng Zhang) 한국정치사회연구소 2024 한국과 국제사회 Vol.8 No.2

중국 국가 통계국에서 발표한 데이터에 따르면, 2022년 60세 이상 인구는 전체의 19.6%이며, 2035년에는 4억을 초과하여 고령화 사회의 단계에 접어들 것이라고 한다. 질병의 발병률이 매우 높은 고령층은 의약품의 복용 과정에서 주의해야 할 점이 많은 반면, 이에 대한 이해가 부족하여 의약품의 복용에 따른 잠재적인 위험에 항상 노출되어 있다. 이에 따라 의약품 포장에 대한 고령층의 요구를 수용하고, 의약품 복용의 정확성과 편의성을 향상시키는 문제는 당면의 과제가 되고 있다. 본 연구는 디지털 휴먼 기술을 도입하여 의약품 포장의 혁신적인 디자인을 강구하고, 이를 통해 고령층의 의약품 관련 문제에 대한 해결을 목표로 한다. 의약품 포장 디자인에 디지털 휴먼 기술을 적용하는 것은 최근 디지털 발전의 추세에 부합하며, 고령층을 대상으로 하는 의약품 포장 디자인에 새로운 사로를 제공할 수 있다. 따라서 본 연구는 문헌 분석법 및 사례 분석법 등을 통해 고령층을 대상으로 하는 의약품 포장 디자인의 발전 현황을 파악하여, 기존 제한적인 정보만을 제공하던 단일 시각 형태의 전통적인 의약품 포장 디자인의 한계를 극복하고, 새로운 디자인 방안을 제시하여 고령층이 더 다양한 방식으로 의약품 포장을 통해 필요한 정보를 인식할 수 있도록 만들고자 하였다. 기존 의약품 포장 디자인에 대한 분석을 바탕으로 본 연구는 디지털 휴먼 기술과 의약품 포장의 결합에 대한 타당성을 도출했고, 실례를 통해 디지털 휴먼 기술이 의약품 포장에 있어 상당한 응용 가치와 잠재력을 가지고 있다는 사실을 검증하였다. As the global aging phenomenon escalates, the elderly emerge as a high-risk demographic for various diseases, encountering myriad challenges in medication management. Inadequate compre- hension of crucial information, such as medication contraindi- cations and precautions, coupled with a dearth of timely medication reminders from caregivers, poses a potential hazard to the elderly's medication safety. Consequently, addressing the requirements of the elderly regarding medication packaging and enhancing the precision and convenience of medication administ- ration have become pressing imperatives. This study aims to revolutionize pharmaceutical packaging design by integrating digital human technology to address medication challenges among the elderly. Drawing from an analysis of extant pharmaceutical packaging solutions and digital human technology, the study affirmed the feasibility, efficiency, and practicality of amalgamating digital humans with packaging design.