In the context of consortium blockchain, consensus protocols set permission mechanisms to maintain a relatively fixed group participants. They can easily use distributed consistent algorithms for achieving deterministic and efficient generate incessant blocks as ledger. However, most existing do not sufficiently leverage chain structure blocks, therefore leaving room performance improvement. this paper, we first propose Hashchain-based Consensus Acceleration (HCA) protocol. The HCA protocol...

Since the emergence of blockchain, how to improve its transaction throughput and reduce latency has always been an important issue. Hostuff introduced a pipeline mechanism combined it with chain structure performance blockchain networks. HCA revoting on basis Hostuff, further reducing latency, but also brought some problems. In HCA, if leader is malicious, would be possible continuously call replica nodes revote, which can lead network congestion. This paper employs global perfect coin...

This paper develops two-stage inverse data envelopment analysis models with undesirable outputs to formulate resource plans for 16 Chinese listed commercial banks whose are increased and overall efficiency is kept unchanged in the short term. We use these meet three different output targets, namely, increasing both desirable by same percentage, percentages, only while keeping unchanged. find that operation cost interest expense more flexible than labor adjustment process deposits have no...

Blockchain technology builds an immutable and append-only ledger in peer-to-peer networks, which attracts attention from various fields. However, traditional chain-based blockchain systems typically have the problem of low throughput, leading to unsatisfactory performance. Among proposed solutions, introducing a structure Directed Acyclic Graph (DAG) into reaches high transaction throughput. Such approach enables blocks refer more than one previous block, thus processing parallel with better...

To explore the therapeutic effect and safety of target-dose metoprolol in treating chronic heart failure (CHF) patients complicated with diabetes mellitus (DM). Method s : One hundred fifty-four elderly were randomly divided into an observation group a control (n=77), which treated conventional therapy, routinely respectively. The New York Heart Association (NYHA) classification, left ventricular end-systolic diameter (LVESD), end-diastolic (LVEDD), ejection fraction (LVEF), 6-min walking...

Blockchain technology has become a research hotspot in distributed systems, aiming to sustain decentralized ledger via consensus. Traditional consensus solutions exhibit slow processing speed and response time, resulting poor performance. To address this issue, several protocols have been proposed. One such popular protocol is HotStuff, Byzantine fault-tolerant (BFT) that achieves high throughput at the cost of latency. However, its suffers from proportional decrease with increase latency,...

Multi-Clock Snapshot Isolation (MCSI) is a concurrency control mechanism that implements snapshot isolation on single-layer Non-Volatile Memory (NVM) database. It stores single copy of data by using multi-version storage to ensure durability and runtime access. With multi-clock transaction timestamp assignment, MCSI can efficiently generate snapshots with vector clocks use per-thread status arrays identify uncommitted versions in NVM. For evaluation, we compared the PostgreSQL-style used NVM...

I-V curve and MPP are key parameters for solar cell performance measuring. A low-cost testing system based on Zigbee outdoor measuring is presented in this paper. The algorithm combining constant scale incremental conductance discussed. Interpolation method reconstruction its error source analyzed. This paper also reports the specific structure of our system. Using developed test system, we present a detailed numerical investigation experiments about distributed measurement. results show...

<abstract><p>Nakamoto consensus is prevailing in the world largest blockchain-based cryptocurrency systems, such as Bitcoin and Ethereum. Since then, various attempts have been studied to attack Nakamoto worldwide. In recent years, network delay has won more attention for making inconsistent ledgers applications by virtue of attacking consensus. However, so far we know, most existing works mainly focus on constructing blockchain but not offering fine-grained theoretical analysis...

The article is devoted to the specifics of China's strategy in countries Black Sea region context implementation “One Belt, One Road” initiative. In this context, interest as a transit zone for transport corridors Chinese Author concludes that although Beijing's relative influence region, compared with other key players such United States, relatively modest, it likely expand, given Turkey, Bulgaria, Georgia investments.