Blockchain is a viable solution to provide data integrity for the enormous volume of 5G IoT social data, while we need to break through the throughput bottleneck of blockchain. Sharding is a promising technology to so...Blockchain is a viable solution to provide data integrity for the enormous volume of 5G IoT social data, while we need to break through the throughput bottleneck of blockchain. Sharding is a promising technology to solve the problem of low throughput in blockchains. However, cross-shard communication hinders the effective improvement of blockchain throughput. Therefore, it is critical to reasonably allocate transactions to different shards to improve blockchain throughput. Existing research on blockchain sharding mainly focuses on shards formation, configuration, and consensus, while ignoring the negative impact of cross-shard communication on blockchain throughput. Aiming to maximize the throughput of transaction processing, we study how to allocate blockchain transactions to shards in this paper. We propose an Associated Transaction assignment algorithm based on Closest Fit (ATCF). ATCF classifies associated transactions into transaction groups which are then assigned to different shards in the non-ascending order of transaction group sizes periodically. Within each epoch, ATCF tries to select a shard that can handle all the transactions for each transaction group. If there are multiple such shards, ATCF selects the shard with the remaining processing capacity closest to the number of transactions in the transaction group. When no such shard exists, ATCF chooses the shard with the largest remaining processing capacity for the transaction group. The transaction groups that cannot be completely processed within the current epoch will be allocated in the subsequent epochs. We prove that ATCF is a 2-approximation algorithm for the associated transaction assignment problem. Simulation results show that ATCF can effectively improve the blockchain throughput and reduce the number of cross-shard transactions.展开更多
This paper uses two navigation schemes to prove the potential of a novel autonomous orbit determination with stellar horizon atmospheric refraction measurements. Scheme one needs a single processor and uses an extende...This paper uses two navigation schemes to prove the potential of a novel autonomous orbit determination with stellar horizon atmospheric refraction measurements. Scheme one needs a single processor and uses an extended Kalman filter. The second scheme needs two parallel processors. One processor uses a hatched leastsquare initial state estimator and a high-precision dynamic state propagator. The other processor uses a real-time orbit predictor. Simulations have been executed respectively for three types （low/medial/high） of satellite orbits on which various numbers of stars are observed. The results show both schemes can autonomously determine the orbits with a considerable performance. The second scheme in general performs a little better than the first scheme.展开更多
The analysis of women’ contribution to Arabic literature brings to light novels written by Arab women novelists whose writings reflect the intricate factors restraining women between the tradition and the codes of Is...The analysis of women’ contribution to Arabic literature brings to light novels written by Arab women novelists whose writings reflect the intricate factors restraining women between the tradition and the codes of Islam. The Syrian writer Ulfat Idilbi and the Jordanian novelist Fadia Faqir delineate such entanglment elequently in both Sabriya: Damascus Bitter Sweet and Pillars of Salt. The paper previews some critical opinions namely of: the Egyptian American Professor of Women Studies and Religion, Leila Ahmed;the Moroccan Sociologist and writer, Fatima Mernessi;and the Algerian writer and film maker, Assia Djebar. Through manifesting theses critical views along with the two novels, the paper proposes that much of the gender inequalituy practised in the Arab societies and reflected in the two novels, might be rooted in the tradition, not the religion itself.展开更多
The principles of the HIV-AIDS epidemics are established based on the subpopulation 1) Susceptible;2) HIV-infected;3) AIDS-infected;4) Immunized. The immunized subset of the population in this paper is the total indiv...The principles of the HIV-AIDS epidemics are established based on the subpopulation 1) Susceptible;2) HIV-infected;3) AIDS-infected;4) Immunized. The immunized subset of the population in this paper is the total individuals who were infected and cured or immunized by vaccination. The immunized group can be identified by removing individuals from the susceptible group. A general mathematical model is developed for HIV-AIDS epidemics with Vaccination to understand the spread of the virus throughout the population. Particularly we use numerical simulation with some values of parameters to predict the number of infected individuals during a certain period in a population and the effect of vaccine to reduce infected group and increase the number of immunized individuals. Further, we expand the research to special cases with no vaccinations. A special case is when the removal subset of the population is empty, or there is no recovery in this epidemic. We also can consider the total infected number is equal to the sum of the HIV infected and the number of AIDS infected. As a result, one can reduce four-stage HIV-AIDS investigation to a three-stage of SIR. With this introduction and modification, the numerical simulation can be developed the Monte Carlo simulation method in SIR case to verify the Validity of the HIV-AIDS model.展开更多
Books in 2010 by Stephen Kinzer,Andrew C.McCarthy,and Robert R.Reilly,major writers on the Middle East and Islam,have clearly articulated the crisis facing both critical areas of the Middle East and Islam,especially a...Books in 2010 by Stephen Kinzer,Andrew C.McCarthy,and Robert R.Reilly,major writers on the Middle East and Islam,have clearly articulated the crisis facing both critical areas of the Middle East and Islam,especially as they affect the international relations of such countries as the United States.Kinzer traces the development of Turkey toward a modernizing secular democracy and Iran toward a traditional Islamic Republic.He proposes a series of initiatives for the United States to utilize to make them allies,as well as to help solve the crisis between Israel and Palestine.Sensationalizing“the Iran threat”to America and other Western countries,the very conservative McCarthy claims that Islam’s“Grand Jihad”is directed not only toward other Western countries but particularly against the United States.He equates Islam as aligned with“the Left”and calls the Obama administration a major part of a socialistic“Left”which enables Islam to defeat American Christian values and heritage from inside.Reilly claims that Islam chose irrationality over rationality in its domestic and foreign affairs over a millennium ago,leading to a very illusive peace in the Middle East,an area where scientific exploration is nearly dead,translating fewer books in the last thousand years than Spain in a single year,and why Muslims see natural disasters as Allah’s direct retribution for non-Islamic,and thus impure behavior toward Allah.展开更多
PROFESSOR Yuan Jingfang has many titles: Dean of the Music Department, Central Conservatory of Music; Tutor of Doctors; Vice-president of China’s Traditional Music Society; Member of the National Music Committee of C...PROFESSOR Yuan Jingfang has many titles: Dean of the Music Department, Central Conservatory of Music; Tutor of Doctors; Vice-president of China’s Traditional Music Society; Member of the National Music Committee of China’s Musicians Society; and Council Member of South China’s Music. Yuan truly carried on national music traditions and has persisted in disseminating them. Yuan is from Yueyang, Hunan Province. Her love of music was not influenced by her family, unlike other performers of national instrumental music. Yuan’s father is an engineer and her mother a nurse. Her desire to perform and study national music was fostered by the vigorous and grand scene she witnessed of performers beating waist drums to celebrate the founding of New China.展开更多
Stable consumptiongrowth worldwideHydrazine hydrate is an organic chemi-cal raw material with extensiveapplications.The world’s capacity toproduce hydrazine hydrate hasreached more than 200 thousand t/atoday(based on...Stable consumptiongrowth worldwideHydrazine hydrate is an organic chemi-cal raw material with extensiveapplications.The world’s capacity toproduce hydrazine hydrate hasreached more than 200 thousand t/atoday(based on 100% hydrazinecontent).The capacity is divided nearlyequally between Europe,Asia andAmerica(35%,34% and 30%,respectively),with only 1% in展开更多
基金supported by Anhui Provincial Key R&D Program of China(202004a05020040),the open project of State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System in China(CEMEE2018Z0102B)the open fund of Intelligent Interconnected Systems Laboratory of Anhui Province(PA2021AKSK0114),Hefei University of Technology.
文摘Blockchain is a viable solution to provide data integrity for the enormous volume of 5G IoT social data, while we need to break through the throughput bottleneck of blockchain. Sharding is a promising technology to solve the problem of low throughput in blockchains. However, cross-shard communication hinders the effective improvement of blockchain throughput. Therefore, it is critical to reasonably allocate transactions to different shards to improve blockchain throughput. Existing research on blockchain sharding mainly focuses on shards formation, configuration, and consensus, while ignoring the negative impact of cross-shard communication on blockchain throughput. Aiming to maximize the throughput of transaction processing, we study how to allocate blockchain transactions to shards in this paper. We propose an Associated Transaction assignment algorithm based on Closest Fit (ATCF). ATCF classifies associated transactions into transaction groups which are then assigned to different shards in the non-ascending order of transaction group sizes periodically. Within each epoch, ATCF tries to select a shard that can handle all the transactions for each transaction group. If there are multiple such shards, ATCF selects the shard with the remaining processing capacity closest to the number of transactions in the transaction group. When no such shard exists, ATCF chooses the shard with the largest remaining processing capacity for the transaction group. The transaction groups that cannot be completely processed within the current epoch will be allocated in the subsequent epochs. We prove that ATCF is a 2-approximation algorithm for the associated transaction assignment problem. Simulation results show that ATCF can effectively improve the blockchain throughput and reduce the number of cross-shard transactions.
文摘This paper uses two navigation schemes to prove the potential of a novel autonomous orbit determination with stellar horizon atmospheric refraction measurements. Scheme one needs a single processor and uses an extended Kalman filter. The second scheme needs two parallel processors. One processor uses a hatched leastsquare initial state estimator and a high-precision dynamic state propagator. The other processor uses a real-time orbit predictor. Simulations have been executed respectively for three types （low/medial/high） of satellite orbits on which various numbers of stars are observed. The results show both schemes can autonomously determine the orbits with a considerable performance. The second scheme in general performs a little better than the first scheme.
文摘The analysis of women’ contribution to Arabic literature brings to light novels written by Arab women novelists whose writings reflect the intricate factors restraining women between the tradition and the codes of Islam. The Syrian writer Ulfat Idilbi and the Jordanian novelist Fadia Faqir delineate such entanglment elequently in both Sabriya: Damascus Bitter Sweet and Pillars of Salt. The paper previews some critical opinions namely of: the Egyptian American Professor of Women Studies and Religion, Leila Ahmed;the Moroccan Sociologist and writer, Fatima Mernessi;and the Algerian writer and film maker, Assia Djebar. Through manifesting theses critical views along with the two novels, the paper proposes that much of the gender inequalituy practised in the Arab societies and reflected in the two novels, might be rooted in the tradition, not the religion itself.
文摘The principles of the HIV-AIDS epidemics are established based on the subpopulation 1) Susceptible;2) HIV-infected;3) AIDS-infected;4) Immunized. The immunized subset of the population in this paper is the total individuals who were infected and cured or immunized by vaccination. The immunized group can be identified by removing individuals from the susceptible group. A general mathematical model is developed for HIV-AIDS epidemics with Vaccination to understand the spread of the virus throughout the population. Particularly we use numerical simulation with some values of parameters to predict the number of infected individuals during a certain period in a population and the effect of vaccine to reduce infected group and increase the number of immunized individuals. Further, we expand the research to special cases with no vaccinations. A special case is when the removal subset of the population is empty, or there is no recovery in this epidemic. We also can consider the total infected number is equal to the sum of the HIV infected and the number of AIDS infected. As a result, one can reduce four-stage HIV-AIDS investigation to a three-stage of SIR. With this introduction and modification, the numerical simulation can be developed the Monte Carlo simulation method in SIR case to verify the Validity of the HIV-AIDS model.
文摘Books in 2010 by Stephen Kinzer,Andrew C.McCarthy,and Robert R.Reilly,major writers on the Middle East and Islam,have clearly articulated the crisis facing both critical areas of the Middle East and Islam,especially as they affect the international relations of such countries as the United States.Kinzer traces the development of Turkey toward a modernizing secular democracy and Iran toward a traditional Islamic Republic.He proposes a series of initiatives for the United States to utilize to make them allies,as well as to help solve the crisis between Israel and Palestine.Sensationalizing“the Iran threat”to America and other Western countries,the very conservative McCarthy claims that Islam’s“Grand Jihad”is directed not only toward other Western countries but particularly against the United States.He equates Islam as aligned with“the Left”and calls the Obama administration a major part of a socialistic“Left”which enables Islam to defeat American Christian values and heritage from inside.Reilly claims that Islam chose irrationality over rationality in its domestic and foreign affairs over a millennium ago,leading to a very illusive peace in the Middle East,an area where scientific exploration is nearly dead,translating fewer books in the last thousand years than Spain in a single year,and why Muslims see natural disasters as Allah’s direct retribution for non-Islamic,and thus impure behavior toward Allah.
文摘PROFESSOR Yuan Jingfang has many titles: Dean of the Music Department, Central Conservatory of Music; Tutor of Doctors; Vice-president of China’s Traditional Music Society; Member of the National Music Committee of China’s Musicians Society; and Council Member of South China’s Music. Yuan truly carried on national music traditions and has persisted in disseminating them. Yuan is from Yueyang, Hunan Province. Her love of music was not influenced by her family, unlike other performers of national instrumental music. Yuan’s father is an engineer and her mother a nurse. Her desire to perform and study national music was fostered by the vigorous and grand scene she witnessed of performers beating waist drums to celebrate the founding of New China.
文摘Stable consumptiongrowth worldwideHydrazine hydrate is an organic chemi-cal raw material with extensiveapplications.The world’s capacity toproduce hydrazine hydrate hasreached more than 200 thousand t/atoday(based on 100% hydrazinecontent).The capacity is divided nearlyequally between Europe,Asia andAmerica(35%,34% and 30%,respectively),with only 1% in
