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根据最小一乘回归只考虑偏差绝对值而具有受异常点影响小的特点,将其应用于物价因素对舰船维修工时费用的影响分析中,验证了物价因素对工时费用影响较为显著的结论。通过与最小二乘回归求解该问题进行比较发现,最小一乘方法具有较好的回归效果和稳健性。 相似文献
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为了使海军的日常军事活动保持在一个可接受的风险等级之下,世界各国海军一直力求实现舰船安全性和作战性能之间的最佳平衡。随着北约各国政府对海军舰船安全等级要求的逐步提高,各成员国海军普遍采取将海军舰船加入船级社的船级,即"军船入级"的做法来应对这种新的挑战。然而,船级社的规范植根于国际性的立法,为了解决好海军舰船入级后各类标准、规范之间的有效衔接,同时为其提供一个更加协调一致而透明的安全标准,国际军船安全协会(INSA)颁布了适用于海军舰船的"ANEP77海军舰船法规(Naval Ship Code,NSC)"。该法规最初被称作"海军舰船SOLAS协定",与国际海事组织(IMO)的SOLAS公约具有类似适用的功用。截止目前,包括美国、英国、德国、意大利和挪威等在内的二十多个国家的海军和船级社加入了INSA,"海军舰船法规"正被越来越多的国家所接受和认可,在提高海军舰船的安全性方面发挥着日益重要的作用。 相似文献
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运用"以人为本"理念进行大型舰船的设计是当前的一种趋势,本文分别就"以人为本"理念在大型舰船总体设计、消防、居住性、舰船环境、生活等方面的应用进行了介绍. 相似文献
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基于故障类型的舰船装备系统最优检测与预防性维修周期的确定 总被引:3,自引:2,他引:1
结合系统维修的费用参数和故障特点,按单位维修周期费用最小原则建立一种综合考虑不同故障类型的系统检测与预防性维修优化模型,针对一个故障时间服从二参数威布尔分布的舰船装备系统,计算各种形状参数和隐蔽发生概率下的最优检测和预防性维修周期。 相似文献
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基于灰色系统理论,使用海军舰船维修费用历史数据建立初值修正的GM(1,1)模型,利用少量数据中的显信息和隐信息,避免复杂的相关关系,克服了原始数据的离散性,得到较高精度的拟合效果,并对海军舰船维修费用进行短期预测。将预测结果加入等维信息模型,对未来费用支出进行动态预测。结果表明:其精度优于传统模型。 相似文献
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We investigate second-hand vessel price heterogeneity. Based on a sample of 5,591 purchase and sale transactions in the dry bulk sector over the period 1998–2016, we deploy a nonparametric regression technique to assess the determinants of vessel price and vessel price variability. Next, we use quantile regression to estimate the effect of regressors (sources of heterogeneity) at different parts of the vessel price distribution. We find evidence that main sources of vessel price heterogeneity are the age of the ship (the older the vessel the higher its maintenance cost), the 3-month LIBOR (reflecting the cost of financing) and the annual charter rate (revenues from operation). Their influence is stronger at all higher quantiles (periods of expansion) and the median of the vessel price distribution. 相似文献
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This study investigates determinants of the property damage cost and injury severity of ferry vessel accidents. Detailed data
of individual ferry vessel accidents for the 11-year timeperiod 1991–2001 that were investigated by the U.S. Coast Guard are
used to estimate ferry-vessel accident property damage cost and injury severity equations. Tobit regression is used to estimate
the former equation and the ordered probit model is used to estimate the latter. Property damage costs include damage costs
to the vessel itself, its cargo and contents, and other-property damage (e.g., damage to pier structures and waterfront facilities).
Injury severity for a ferry vessel accident is measured as an ordinal variable — no injuries, non-fatal injuries and fatal
injuries. Damage cost and injury severity of individual ferry vessel accidents are expressed as functions of the type of vessel
accident, vessel characteristics, vessel operation phase, weather/visibility conditions, type of waterway, type of vessel
propulsion, type of vessel hull construction and cause of vessel accident. The property damage estimation results suggest
that allision, collision and fire ferry vessel accidents incur more vessel property damage cost per vessel gross ton than
other types of accidents. The injury severity estimation results suggest that injury severity is greater when the ferry vessel
accident is caused by human error as opposed to vessel and environmental factors. 相似文献
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This study investigates determinants of the number of injured, deceased and missing occupants and the damage cost of passenger vessel accidents that were investigated by the US Coast Guard for the years 1991-2001. Negative binomial and Poisson regression estimates suggest that: (1) passenger-freight combination vessel accidents incur greater injuries than other types of passenger vessels, (2) deaths are greater when precipitation weather and poor visibility exist and (3) missing occupants are greater for capsize accidents and larger the vessel. The damage cost per vessel gross ton is less for ocean cruise and steel-hulled vessels. The major conclusion of the study is that human (as opposed to environmental and vessel) causes of passenger vessel accidents result in increases in the number of injured, deceased and missing occupants. 相似文献
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平潭海峡是中小型船舶东北季风盛行季节北上的黄金水道。近年来随着国民经济的快速增长,沿海航运业得到迅猛发展,海峡船舶密度明显增大。平潭海峡大桥位于平潭海峡中部,桥区通航孔附近每小时最大交通量为17艘,出现船舶追越局面的可能性较大。海峡碍航物多,水流复杂,且小型船舶违规、违章航行现象较普遍,存在一定的安全隐患。定量分析桥区船舶交通危险,进行科学的船舶交通管理系统成本与效益分析,恰当划分与确定船舶交管系统等级,使系统的建设规模符合当地船舶交通的实际需要,力求取得较好的社会效益和经济效益。 相似文献
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Wayne K. Talley 《Maritime Policy and Management》2001,28(2):175-186
This study investigates determinants of the vessel, cargo, and other-property damage costs of bulk barge accidents in US inland waterways. Tobit estimation of a three-equation recursive model suggests that, in bulk barge accidents: (1) vessel damage cost is greater for collision, fire/explosion, and material/equipment failure accidents than for groundings; (2) cargo damage cost is greater at night and when the weather is foggy and increases with barge age; and (3) otherproperty damage cost is greater for multi-vessel accidents, but decreases with barge size. A dollar of vessel damage cost increases other-property damage cost by $1.38, while a dollar of cargo damage cost increases this cost by $6.90. An important result for formulating bulk barge accident cost-reduction policies is that a given determinant might have a negative effect on one type of damage cost but a positive effect on another. 相似文献
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运用热经济学分析方法对燃气初温的确定进行研究,建立燃气轮机的热力学模型、涡轮叶片的寿命表达式和经济学模型;以装置每小时消耗费用为目标函数,对燃气轮机的燃气初温进行优化分析,得出优化结果。 相似文献