基于业务流程再造的IT项目用例分析

在IT项目中,业务流程再造从根本上重新思考并彻底重新设计业务流程,系统的用例分析应当以业务为中心,结合参与者视角,才能较完整和系统地发现、描述用例,表达客户的行为需求或功能需求。     

浅谈客房管理的目标与要求

本文详尽阐述了旅游饭店客房管理应达到的目标与要求，主要包括客房清洁保养、优质服务、专业化员工队伍、创新和财与物管理等内容     

Transfer learning for hierarchical forecasting: Reducing computational efforts of M5 winning methods

The winning machine learning methods of the M5 Accuracy competition demonstrated high levels of forecast accuracy compared to the top-performing benchmarks in the history of the M-competitions. Yet, large-scale adoption is hampered due to the significant computational requirements to model, tune, and train these state-of-the-art algorithms. To overcome this major issue, we discuss the potential of transfer learning (TL) to reduce the computational effort in hierarchical forecasting and provide a proof of concept that TL can be applied on M5 top-performing methods. We demonstrate our easy-to-use TL framework on the recursive store-level LightGBM models of the M5 winning method and attain similar levels of forecast accuracy with roughly 25% less training time. Our findings provide evidence for a novel application of TL to facilitate the practical applicability of the M5 winning methods in large-scale settings with hierarchically structured data.     

Reconstructing production efficiency,land use and trade for livestock systems in historical perspective. The case of France, 1961–2010

This paper provides an original accounting of changes in livestock production efficiency per livestock category in historical perspective and connects livestock consumption with land requirements and virtual land trade. We use France as a demonstration study and account for productivity changes in terms of energy. Feed rations composition are reconstructed per livestock production and feed crop group over time to account for changes in land use in relation to dietary changes. Land requirements for consumption in France dropped by 28% over the study period besides an increase by 35% of the human population and by 53% of the livestock consumption. The two-fold increase in agricultural productivity is due, for half, to energy conversion efficiency improvements and for half to agricultural yields. Overall, the livestock energy conversion efficiency increased by 45% from 1961 to 2010, poultry gained 84%, pork 17%, sheep&goat 67% and cattle 27%. The feed share of oilcrops and cereals in animal rations doubled against a drop by 35% of feed from pastures. Virtual land imports for oilcrops in relation to livestock consumption in France today amount to 0.9 million ha against a maximum of 1.9 million ha in 1979. Besides its dependence on oilcrops imports, the French livestock sector displays net virtual land exports ranging from about 2.5–5.3 million ha per year over the study period. Gross virtual land trade is today five times higher than the net virtual trade. The difference highlights the share of circular product loops in increasingly integrated agricultural markets at the international scale.     

Regulating the banking industry in transition economies: Exploring interactions between capital and reserve requirements

This paper examines the ‘prudential' role of reserve requirements in transition economies using a general-equilibrium banking model. The analysis stresses the role that reserve requirements may play in enforcing an adequate level of bank capitalization in a context in which it is difficult to assess the true value of bank assets. The paper also explores the interactions that exist between capital and reserve requirements and the effect of these regulations on the financial structure of banks and on the level of credit and interest rates.     

Facilitation Methods for Collaborative Modeling Tools

This paper presents results of an ongoing research effort to support effective user involvement during modeling and analysis meetings. Productivity and user participation of traditional group meetings have been limitations imposed by chauffeured facilitation and single-user tools. These tools have been designed for analysts rather than for direct use by non-analyst users. Recently, electronic meeting systems (EMS) modeling tools that allow users to work in parallel to contribute directly during meetings have been developed. Such tools allow more domain experts to participate directly and productively during model development meetings than is possible using the traditional approach. Although previous research has demonstrated that EMS modeling tools may be used to develop some model content, little research had been done on collaborative facilitation methods that employ these tools. This paper presents a comparison of modeling approaches for use with EMS modeling tools and proposes an approach that overcomes significant problems inherent in other approaches. It leverages the productivity enhancement afforded by direct group access and still results in production of complete, integrated, high quality models. This approach allows models to be developed two to four times faster than with traditional modeling support and yet avoids model ambiguities and inconsistencies.     

A Martingale Characterization of Consumption Choices and Hedging Costs with Margin Requirements

This paper examines optimal consumption and investment choices and the cost of hedging contingent claims in the presence of margin requirements or, more generally, of nonlinear wealth dynamics and constraints on the portfolio policies. Existence of optimal policies is established using martingale and duality techniques under general assumptions on the securities' price process and the investor's preferences. As an illustration, explicit solutions are provided for an agent with ‘logarithmic’ utility. A PDE characterization of the cost of hedging a nonnegative path‐independent European contingent claim is also provided.     

Municipal annexation: Does state policy matter?

Annexation, the process of bringing land from one jurisdiction to another is the means by which municipalities physically expand in the United States. The process of annexation is implemented through procedures at the local level and authorized by general state enabling legislation. State annexation policy varies widely across the United States, but it has the potential to play a significant role in facilitating or constraining local annexation activity. This paper details the effects of specific provisions of state annexation law on municipal annexation activity. A sample of over 900 cities containing at least 10,000 people that annexed during the 1990–1999 decade was used to explore the effects. Eleven different provisions of state law were included in the analysis, including whether the state has a boundary agency overseeing annexation and whether an election is required to complete the annexation process. Results show that nearly all state provisions affect the frequency of municipal annexation, although some had unexpected results. State provisions also affect rates of annexation and acre growth through annexation, but not as consistently as they affect frequencies. The paper concludes with a discussion of the efficacy of state policy to influence local annexation activity.     

谈粮食筒库变电所的设计

根据粮食筒库的设备特点及供电要求,阐述了筒库变电所的选址、形式以及对建筑、防火、暖通专业的要求。