An advanced risk analysis approach for container port safety evaluation

Risk analysis in seaports plays an increasingly important role in ensuring port operation reliability, maritime transportation safety and supply chain distribution resilience. However, the task is not straightforward given the challenges, including that port safety is affected by multiple factors related to design, installation, operation and maintenance and that traditional risk assessment methods such as quantitative risk analysis cannot sufficiently address uncertainty in failure data. This paper develops an advanced Failure Mode and Effects Analysis (FMEA) approach through incorporating Fuzzy Rule-Based Bayesian Networks (FRBN) to evaluate the criticality of the hazardous events (HEs) in a container terminal. The rational use of the Degrees of Belief (DoB) in a fuzzy rule base (FRB) facilitates the implementation of the new method in Container Terminal Risk Evaluation (CTRE) in practice. Compared to conventional FMEA methods, the new approach integrates FRB and BN in a complementary manner, in which the former provides a realistic and flexible way to describe input failure information while the latter allows easy updating of risk estimation results and facilitates real-time safety evaluation and dynamic risk-based decision support in container terminals. The proposed approach can also be tailored for wider application in other engineering and management systems, especially when instant risk ranking is required by the stakeholders to measure, predict and improve their system safety and reliability performance.     

Manpower supply and demand of ocean deck officers in Taiwan

This study adopted a 5-year moving average to calculate the transition probability of deck officers in Taiwan from 1993–1998 at different levels in the hierarchy. An absorbing Markov transition matrix was also constructed to forecast the terms of seniority and the annual supply of deck officers. In addition, this work applied the GM (1,1) model of Grey theory to forecast the annual demand of deck officers, and used cross analysis to investigate the manpower supply and demand of ocean deck officers in Taiwan. Results in this study can provide a valuable reference for pertinent authorities when determining the manpower policy of shipping companies in Taiwan.     

舰船物资转运方案计算机辅助决策算法研究

瞬息万变的现代战场对大中型水面战斗舰船甲板物资转运的效率提出越来越高的要求。引入计算机辅助决策技术,在考虑多种牵制因素的情况下,快速获得最优的物资转运方案。详细分析和阐述舰船物资转运线路规划、时间计算、作业排序以及资源配班等4个主要问题的计算机解决方法,为利用计算机辅助制定最优物资转运方案提供可行途径。     

适用于高速铁路的计算机联锁测试平台设计

因高速铁路和客运专线的建设需要,计算机联锁系统增加了新的控制功能和外部接口,如正线车站的点灯和灭灯功能,以及与列控系统的安全通信接口等。计算机联锁的新增功能和通信接口直接影响着整个系统的安全性和可靠性。因此,研究科学的、全面的测试方法,设计适合高速铁路的计算机联锁测试平台,对提高计算机联锁系统的安全性、可靠性具有重要的意义。重点对测试平台的结构、测试案例、测试方法等进行了叙述。     

适用于高速铁路的TYJL-ADX型联锁系统的研究与实现

通过对既有TYJL-ADX型计算机联锁系统的分析、结合中国高速铁路对联锁系统的技术需求,说明了在原系统的基础上开发适用于高速铁路的联锁系统的必要性,详细阐述了具体的实现原则及方法,新系统的结构、主要功能,最后总结了新系统的实际应用情况。     

Color image segmentation by edge linking and region grouping

A novel method toward color image segmentation is proposed based on edge linking and region grouping. Firstly, the edges extracted by the Canny detector are linked to form regions. Each of the end points of edges is connected by a direct line to the nearest pixel on another edge segment within a sub-window. A new distance is defined based on the feature that the edge tends to preserve its original direction. By sampling the lines to the image, the image is over-segmented to labeled regions. Secondly, the labeled regions are grouped both locally and globally. A decision tree is constructed to decide the importance of properties that affect the merging procedure. Finally, the result is refined by user’s selection of regions that compose the desired object. Experiments show that the method can effectively segment the object and is much faster than the state-of-the-art color image segmentation methods.     

Efficient democratic group signatures with threshold traceability

Democratic group signature (DGS) is a group-oriented primitive with great flexibilities, i.e., no group manager, anonymity, and traceability. In a DGS scheme with (t, n)-threshold traceability, any subset of not less than t members can jointly reveal the identity of the signer while preserving security even in the presence of an active adversary can corrupt up to t − 1 group members. This paper proposes an efficient DGS scheme. We use publicly verifiable secret sharing (PVSS) to distribute the trapdoor via which the real signer is revealed. The computation cost and communication overhead of our DGS signatures are greatly reduced, compared with the existing work. For example, the size of the resulting signature contains only 2n + 1 elements of Z _q , except the PVSS output.     

铁路既有繁忙干线货运产品布局优化模型及算法

采用节点拆分的方式构建了既有繁忙干线货运产品网络，在此基础上按运输需求的特征对其分类并借鉴服务网络设计的思想，设计了既有繁忙干线铁路货运产品布局优化模型，采用免疫克隆变邻域搜索算法对模型进行求解，最后采用算例对模型和算法进行验证分析，测试结果表明模型和算法具有较好的适用性．     

Evolving competition between Hong Kong and Shenzhen ports

Shenzhen Port (SZP), once a negligible local port, has risen dramatically to a world-leading container port and an “equal” player with Hong Kong Port (HKP). Will this market share reallocation continue, or will equilibrium be eventually realized for HKP to prosper continuously? We examine the relationship between these two ports to answer this question. We propose a new transformation method to describe the growth of container cargo transport demand, define the quantitative measures of the competition relationship and port competitiveness, and present a rigorous analytical framework with econometric tests and models to understand the true relationship between HKP and SZP. Direct empirical tests suggest that SZP complements HKP; however, the two ports exhibit strong competition when the effect of demand growth is excluded. Considering transshipment separately, we find that the impact of SZP on HKP is negative in transshipment but complementary in direct shipment. We may conclude that HKP does not affect SZP, whereas SZP has competitive power over HKP. These results are consistent with the findings of some previous theoretical studies.     

运牛船照明系统的设计

本文对牲口运输船的照明设计做初步总结和分析。由于牲口运输的特殊性,规范对此类船舶的要求也相应较高,故在设计开发过程中遇到很多跟普通商船有很大差异的地方。为此,文章重点阐述了运牛船货舱区域灯具布置的难点,并给出这些难点的解决过程和方案。