我国航海心理学研究的现状与展望

综述了我国航海心理学发展的历史和现状,从航海心理学学科理论体系构建、生物节律、海员心理过程、海员心理疲劳、海员个性与测验编制、海员心理卫生状态等六个方面阐述了我国在航海心理学方面的研究成果,对目前航海心理学研究中存在的一些问题,提出了看法,并展望了航海心理学发展的方向。     

Exploring the possibility of MaaS service in Thailand,implications from the existing conditions and experts' opinions on “Who should be the MaaS provider in Bangkok?”

Mobility-as-a-Service or MaaS is the emerging transport solution that services a package of mobility to customers. MaaS aims to give a new travel experience to travelers, in terms of access to the services and seamless trips on one single platform. The organization of MaaS requires a new player, a MaaS provider, who mediates the travelers (customers) and transport services. The MaaS provider takes the roles of data provider, integrator, and MaaS operator. In many pilot and implementation of MaaS schemes around the world, the MaaS providers come from various stakeholders and employ various business models. MaaS providers are crucial in that they lead the cooperation among all stakeholders and are the driving force of the services. In Bangkok, Thailand, where MaaS is a relatively new concept, the identification of a suitable MaaS provider was explored. Taking the local transport conditions, both demand and service conditions, scenarios of probable MaaS providers were investigated. The study method included literature reviews and collection of present transport setting, including the organizational arrangement. Expert interview and focus group meeting were used to form a concrete understanding and to imply the possibility of the MaaS provider in Bangkok. Three scenarios of Maas providers were set: public transport service provider, private transport service provider and third party, and Public Private Partnership. The results disclose issues that need to be resolved if the stakeholder would serve as the MaaS provider. Several implications are drawn to set the directions of MaaS development and a possible MaaS provider in Bangkok.     

Fuzzy and adaptive fuzzy control for the automobiles’ active suspension system

Two typical criteria for good vehicle suspension performance are their ability to provide good road handling and increased passenger comfort. The main disturbance affecting these two criteria is terrain irregularities. Active suspension control systems reduce these undesirable effects by isolating car body motion from vibrations at the wheels. This paper describes fuzzy and adaptive fuzzy control (AFC) schemes for the automobile active suspension system (ASS). The design objective is to provide smooth vertical motion so as to achieve the road holding and riding comfort over a wide range of road profiles. The efficacy of the proposed control schemes is demonstrated via simulations. With respect to the optimal linear quadratic regulator (LQR), it is shown that superior results have been achieved by the AFC.     

A measurement to driving situation awareness in signalized intersections

Drivers get involved easily in Left-Turn Across Path with Opposite Direction Traffic (LTAP-OD) conflicts at signalized intersection with unprotected left-turn phasing. This study classified the left-turn drivers’ performance into four types: (1) the correct acceptance of safe lags/gaps, (2) the correct rejection of dangerous lags/gaps, (3) the false rejection of safe lags/gaps and (4) the false acceptance of dangerous lags/gaps. Based on the high mounted video camera data, the logistic regression model was used to obtain the critical gaps for estimating whether the lags/gaps were safe or not. The results show that the cognition behavior of the left-turn drivers should be improved while the gap/lag is drawn near the critical gap. Furthermore, the conservative drivers are more likely to reject the larger lags/gaps and yield the right-of-way to the opposing vehicles. Simultaneously the poor response execution may cause drivers to have difficulties during the turning performance when the lags/gaps are large enough. These results could be used as the basis for a discussion of the right time to support the drivers.     

汽车运行材料的应用现状及发展趋势

综述了汽车用燃料(汽油、柴油、代用燃料)、润滑剂(发动机润滑油、齿轮油、自动变速器油、润滑脂)、特种液(制动液、冷却液、空调制冷剂)、燃料添加剂及润滑剂添加剂等运行材料在国内外的应用现状及发展趋势。该研究可为汽车运行材料的新产品研发提供参考。     

Root mean square optimization criterion for vibration behaviour of linear quarter car using analytical methods

In this paper, a linear two-degree-of-freedom quarter car model is used to derive a number of analytical formulae describing the dynamic behaviour of passively suspended vehicles running on a harmonically bumped road. The linearity of the system allows us to analytically investigate the steady-state response characteristics. We derive analytical expressions for the root mean square (RMS) of the sprung mass absolute acceleration and relative displacement. This paper demonstrates the shortcomings of existing classical optimization methods. Hence we introduce a new optimization method based on minimizing the absolute acceleration RMS with respect to the relative displacement RMS. The RMS optimization method is applied for the symbolic derivation of analytical formulae featuring the best compromise among conflicting performance indices pertaining to the vehicle suspension system, i.e., sprung mass acceleration and working space. The proposed optimization technique is utilized to find the optimal damping and stiffness curves for the main suspension. The RMS optimal values are used to create design charts for suspension parameters, which are very useful particularly in the presence of physical constraints such as a limit on relative displacement. We introduce a numerical example to illustrate the optimality of the obtained solutions.     

状态监测与故障诊断技术在设备管理与维修中的应用

状态监测与故障诊断技术是目前国内外发展迅速并极受欢迎的一项重要的设备管理新技术,它是防止突发事故和计划外停机的有效措施,也是我国设备维修的发展方向,因此,在我国现代化设备管理中,积极地研究、探讨、开展并推广这种新技术,具有重要的现实意义。     

高校党的纯洁性建设现状调查与分析

论文通过对当前高校党的纯洁性建设现状开展问卷调查,分析了在新的形势下,高校正经历着市场化的深刻调整,社会交往日益扩大的同时,利益关系格局正经历考验,这对学校党的纯洁性建设带来了新的挑战。论文试从加强廉洁文化进高校工作入手,通过开展校园廉洁文化建设工作、加强宣传教育、培养党员干部廉洁意识等方面,为新形势下进一步加强党的纯洁性建设提出对策建议。     

追越条款的适用是否以存在碰撞危险为前提

追越条款的适用是否以两船存在碰撞危险为条件，历来存在不同的观点，笔者通过对案件和《规则》条文的分析，提出追越条款的适用不是以两船存在碰撞危险为前提，只要符合构成追越局面的条件，不论当时两船是否存在碰撞危险，追越条款就开始适用。     

铁路应急通信的现状及发展趋势

应急通信就是为铁路事故救援和抢险救灾提供通信保障。通信不畅通,应急预案无法实施,甚至会贻误时机和扩大事故范围。为此,根据我国铁路应急通信的现状、模式,分析其发展方向。