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AVS3 is an emerging video coding standard, and screen content coding is a very important feature of AVS3. This paper presents a method of Implicit-Selected Transform Skip (ISTS) to further improve the screen content coding performance. With ISTS, transform skip mode is introduced as an optional substitution to transform-coding on residual signals of blocks with intra-prediction. The indication of whether to apply transform skip is hidden into the Parity of the Number of Non-zero Coefficients (PNNC) of a residual block, instead of being signaled to the decoder. Moreover, the coefficients of an intra-coded block are reordered to make the coefficients more compact. Experimental results show that the proposed method can achieve 12.04%, 8.15% and 10.19% BD-rate savings on average under All Intra (AI), Low Delay (LD) and Random Access (RA) configurations, respectively, with the encoding time reduced by 5% to 8%. ISTS has been adopted into AVS3.

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Despite the use of automation technology in the maritime industry, human errors are still the typical navigational risk factors in Maritime Autonomous Surface Ships with the third degree of autonomy, as defined by the International Maritime Organization. To analyse these human errors, a prediction model for human errors in the emergency disposal process is present. First, the risk factors are identified by analysing the emergency disposal behaviour process of a Shore Control Centre (SCC) under remote navigation mode. This is followed by the establishment of an event tree model of human errors using Technique for Human Error Rate Prediction (THERP). Furthers, a Bayesian Networks (BNs) model based on the THERP is proposed for the three stages: perception, decision, and execution. Subsequently, expert judgments based on the fuzzy theory are used to obtain the basic probability of root nodes and determine the conditional probability of each node in the BNs. Finally, the probabilities of human errors are calculated for the three stages, while the importance of human error factors is quantified with sensitivity analysis, which can provide flexible references for theoretical construction of the SCC and training of staff.

Construction of large steel structure is the key point of the whole National Stadium “Bird's Nest” project, while construction of main truss is the core of the whole steel structure construction. As connection of main trusses will be carried out overhead, the positioning survey work is quite difficult. This paper introduces the construction survey work of main truss.