基于肺恶性肿瘤内科诊断组的病例复杂度衡量模型对比研究

目的:基于肺恶性肿瘤内科诊断组探讨不同病例复杂度衡量模型的异同,为进一步优化DRG分组提供参考。方法:以河南洛阳某三甲医院2019—2022年2131例肺恶性肿瘤内科诊断组为研究对象,分别采用MCC/CC表、PCCL模型和ECC模型计算出研究对象的病例复杂度,通过决策树构建分组,并对分组效果进行对比分析。结果:肺恶性肿瘤内科诊断组按MCC/CC表分为3组,CV值分别为0.51、0.57和0.62,RIV值为0.02;按PCCL模型分为5组,CV值分别为0.57、0.57、0.50、0.76和0.70,RIV值为0.14;按ECC模型分为3组,CV值分别为0.61、0.63和0.49,RIV值为0.03。根据非参数检验结果,各基本组的组间住院费用差异有统计学意义。结论:基于分组性能,MCC/CC表和ECC模型优于PCCL模型,不同ADRG下MCC/CC表和ECC模型分组效果有待进一步对比研究。

我国商业银行利率风险的衡量模型

利率市场化与金融市场对外开放给我国商业银行传统的利率风险管理提出更高的要求 ,如何准确地预测利率变动趋势、衡量利率风险 ,最大限度地减少因利率的波动而蒙受的损失 ,是我国商业银行在利率市场化初期必须解决的问题。

FSA专家评价一致度衡量模型及其改进

为解决FSA导则建议的专家评价一致度衡量模型不能对参与评价的专家进行筛选及提高一致度的问题,提出将传递熵模型与专家评价一致度衡量模型相结合,借助于传递熵模型的筛选作用,改善专家评价一致度的方法.算例结果表明,传递熵模型具有实用性和可操作性,传递熵模型与专家评价一致度衡量模型联合使用可提高专家评价的一致度.

提升高度转化温度:主题出版积极体验设计策略

积极体验设计致力于提升用户体验的质量和可持续性,通过创造积极的情感、认知和行为反应来促进用户参与和投入,从而实现更好的用户体验和更高的用户价值。主题出版机构采纳积极体验设计的原则,即“为愉悦而设计、为意义而设计、为美德而设计”,并运用积极体验HEART衡量度量模型,分析用户的愉悦度、参与度、接受度、留存度和完成度情况,有助于帮助出版方优化出版物或服务的设计与功能,为用户创造积极、有意义和有道德的优质体验。

国外证券分析师盈利预测实证研究综述

在对投资决策、资本成本、公司评估、盈余与股价的关系等进行探讨的文献中,分析师的盈利预测被广泛地用作盈利预期的代理变量,成为理论研究的一项基础。本文对国外证券分析师盈利预测的实证研究文献进行了综述,分析、比较了盈利预测业绩衡量标准、各衡量模型的优劣、乐观偏差、预测修正、意见分歧以及分析师跟进等理论。

区域可持续发展预警系统研究

从系统观念出发,研究了区域可持续发展预警系统的功能与基本结构问题,并结合洛阳实际,设计了预警系统指标体系、衡量与评价方案,旨在尝试构建可持续发展预警系统的框架,为可持续发展的定量研究提供一个新的思路。

肯定当量法在融资租赁决策中的运用

融资租赁是企业筹资的一种特殊形式,面对纷繁众多的风险,企业采用科学的方法进行融资决策,是关系企业长远利益的关键所在。文章引用风险衡量模型,将肯定当量法运用到融资租赁决策中。

企业社会资本的度量与经济后果评述

文章主要总结了企业社会资本的概念、企业社会资本的衡量和企业社会资本给企业带来的各种经济后果等内容,对当前的这些研究成果进行了评价,并对企业社会资本的衡量和企业社会资本的形成机制等方面的内容提出了进一步研究的方向。

区域可持续发展预警系统研究

从系统观的角度出发 ,研究了区域可持续发展预警系统及其结构的设计问题 ,提出将预警活动引入区域可持续发展的活动中来 ,并从理论上设计了预警系统的结构及其衡量与评价模型 ,得出一套综合评价和测算的方案 (常权、递增权、层次分析和变权 ) 。

GEOTHERMAL RESOURCES ASSESSMENT AND NUMERICAL SIMULATION IN TUANBO REGION

This paper mainly deals with the reservoir on the heat and mass transfer and mass and energy balance in a geothermal field.On the basis of briefing the general characteristics of the reservoir and the supposition of the reservoir modeling,the paper emphasizes the mathematical descriptions of hydra thermal transportation and convection by two methods according to the different models,such as lumped parameter model and distributed parameter model.It is effective to use these models in simulating the heterogeneous,and anisotropical fracture reservoir for the designed lifetime of 15 years.

A Distributed Monthly Water Balance Model for Analyzing Impacts of Land Cover Change on Flow Regimes

The Miyun Reservoir is the most important water source for Beijing Municipality, the capital of China with a population of more than 12 million. In recent decades, the inflow to the reservoir has shown a decreasing trend, which has seriously threatened water use in Beijing. In order to analyze the influents of land use and cover change (LUCC) upon inflow to Miyun Reservoir, terrain and land use information from remote sensing were utilized with a revised evapotranspiration estimation formula; a water loss model under conditions of human impacts was introduced; and a distributed monthly water balance model was established and applied to the Chaobai River Basin controlled by the Miyun Reservoir. The model simulation suggested that not only the impact of land cover change on evapotranspiration, but also the extra water loss caused by human activities, such as the water and soil conservation development projects should be considered. Although these development projects were of great benefit to human and ecological protection, they could reallocate water resources in time and space, and in a sense thereby influence the stream flow.

Two-state energy model and experimental study of coal adsorb methane

There are two states of methane existing in coal, free methane and adsorptive methane. The two states of methane exchanged with each other which need the energy exchange with outside. It is released heat when methane adsorption on coal, instead of absorbed heat. According to the gas molecules Boltzmann energy distribution, is obtained the equilibrium equations of the two states of methane in coal, as well as the heat of adsorption equation when exchanged into each other. At the same time, high temperature experiments of methane adsorption on coal have been certificated to the theoretical model. At last the experimental results presented that： the two-state energy model could be accurately described the distribution of the two states of methane in the coal; the adsorption heat is related to the initial equilibrium state of methane adsorption; the adsorption heats are different with different coal ranks.

Energy Balance-Based SWAT Model to Simulate the Mountain Snowmelt and Runoff——Taking the Application in Juntanghu Watershed(China) as an Example

In order to predict long-term flooding under extreme weather conditions in central Asia, an energy balance-based distributed snowmelt runoff model was developed and coupled with the Soil and Water Assessment Tool(SWAT) model. The model was tested at the Juntanghu watershed on the northern slope of the Tian Shan Mountains, Xinjiang,China. We compared the performances of temperature-index method and energy balanced method in SWAT model by taking Juntanghu river basin as an application example(as the simulation experiment was conducted in Juntanghu River, we call the energy balanced method as SWAT-JTH). The results suggest that the SWAT snowmelt model had overall Nash-Sutcliffe efficiency(NSE) coefficients ranging from 0.61 to 0.85 while the physical based approach had NSE coefficients ranging from 0.58 to0.69. Overall, on monthly scale, the SWAT model provides better results than that from the SWAT-JTH model. However, results generated from both methods seem to be fairly close at a daily scale. Thestructure of the temperature-index method is simple and produces reasonable simulation results if the parameters are well within empirical ranges. Although the data requirement for the energy balance method in current observation is difficult to meet and the existence of uncertainty is associated with the experimental approaches of physical processes, the SWAT-JTH model still produced a reasonably high NSE. We conclude that using temperature-index methods to simulate the snowmelt process is sufficient, but the energy balance-based model is still a good choice to simulate extreme weather conditions especially when the required data input for the model is acquired.

Alpha-reliable combined mean traffic equilibrium model with stochastic travel times

Based on the reliability budget and percentile travel time(PTT) concept, a new travel time index named combined mean travel time(CMTT) under stochastic traffic network was proposed. CMTT here was defined as the convex combination of the conditional expectations of PTT-below and PTT-excess travel times. The former was designed as a risk-optimistic travel time index, and the latter was a risk-pessimistic one. Hence, CMTT was able to describe various routing risk-attitudes. The central idea of CMTT was comprehensively illustrated and the difference among the existing travel time indices was analyzed. The Wardropian combined mean traffic equilibrium(CMTE) model was formulated as a variational inequality and solved via an alternating direction algorithm nesting extra-gradient projection process. Some mathematical properties of CMTT and CMTE model were rigorously proved. Finally, a numerical example was performed to characterize the CMTE network. It is founded that that risk-pessimism is of more benefit to a modest(or low) congestion and risk network, however, it changes to be risk-optimism for a high congestion and risk network.

Distributed Fiber Optic Monitoring and Stability Analysis of a Model Slope under Surcharge Loading

In the discipline of geotechnical engineering, fiber optic sensor based distributed monitoring has played an increasingly important role over the past few decades. Compared with conventional sensors, fiber optic sensors have a variety of exclusive advantages, such as smaller size, higher precision, and better corrosion resistance. These innovative monitoring technologies have been successfully applied for performance monitoring of geo-structures and early warning of potential geo- hazards around the world. In order to investigate their ability to monitor slope stability problems, a medium-sized model of soil nailed slope has been constructed in laboratory. The fully distributed Brillouin optical time-domain analysis （BOTDA） sensing technology was employed to measure the horizontal strain distributions inside the model slope. During model construction, a specially designed strain sensing fiber was buried in the soil mass. Afterward, the surcharge loading was applied on the slope crest in stages using hydraulic jacks and a reaction frame. During testing, an NBX-6o5o BOTDA sensing interrogator was used to collect the fiber optic sensing data. The test results have been analyzed in detail, which shows that the fiber optic sensors can capture the progressive deformation and failure pattern of the model slope. The limit equilibrium analyses were also conducted to obtain the factors ofsafety of the slope under different surface loadings. It is found that the characteristic maximum strains can reflect the stability of the model slope and an empirical relationship was obtained, This study verified the effectiveness of the distributed BOTDA sensing technology in performance monitoring of slope.

Sorption of Manganese （II） and Chromium （III） Ions from Aqueous Solution Using Water Hyacinth Biomass （Eichhornia crassipes）

The use of water hyacinth biomass as adsorbent for Cr3＋ and Mn2＋ ions from aqueous solution by means of batch-adsorption technique was investigated to determine the potential ability of the biomaterial for metal ion removal. The equilibrium isotherm study showed that the maximum monolayer coverage on the biomass surface was 0.933 mg·g-1 and 0.874 mg·g-1 for Mn2＋ and Cr3＋ ions respectively. The highest percentage of Cr3＋ and Mn2＋ ions adsorbed by the biomass was 86.4% and 82.6% at the optimum pH of 4.0 and 6.0 respectively. The results also showed that the highest percentage removal 82.5% and 78.3% was obtained at 30 and 20 minutes respectively for Cr3＋ and Mn2＋ ions. The sorption process was examined by means of the Langmuir model. The adsorption equilibrium data were found to follow the Langmuir isotherm model with high coefficients of determination （R2 = 0.990 and 0.999） for Cr＋ and Mn2＋ ions respectively. The adsorption capacity of water hyacinth showed that water hyacinth will be useful in recovering chromium （III） and manganese （II） ions from solution and their subsequent removal from industrial effluents.

Crop Evapotranspiration Estimation through the,Use of Satellite Images

An efficient water use requires accurate estimations of crop ET （evapotranspiration）. However, an accurate ET estimation is really difficult to achieve when big regions such as irrigation districts or complete watersheds are involved. Satellite images are an alternative that can be used to estimate accurate crop ET for big regions. In the present study, two known methods were used to estimate crop ET, the METRIC model which was developed by the University of Idaho and a Kc-NDVI relationship. In the METRIC model, ET is estimated as a residual of the energy balance equation. The second method uses reference ET, and estimates a crop coefficient （K,.） as a linear function of the NDVI vegetation index. ET was estimated in a section of the Rio Mayo Irrigation District located in Sonora, Mexico using Landsat 7 satellite images. Crop ET of the main crops was estimated. Results show some differences between both methods. An average ET depth of 460 mm for the wheat average growing season was found when using METRIC, while an average ET depth of 421 mm was found when using the Kc-NDVI relationship. A water use total efficiency of 62% and 63% was found for METRIC and the Kc-NDVI relationship, respectively.

Numerical Simulation of Multi-Directional Random Wave Transformation in a Yacht Port

This paper extends a prediction model for multi-directional random wave transformation based on an energy balance equation by Mase with the consideration of wave shoaling, refraction, diffraction, reflection and breaking. This numerical model is improved by 1) introducing Wen's frequency spectrum and Mitsuyasu's directional function, which are more suitable to the coastal area of China; 2) considering energy dissipation caused by bottom friction, which ensures more accurate results for large-scale and shallow water areas; 3) taking into account a non-linear dispersion relation. Predictions using the extended wave model are carried out to study the feasibility of constructing the Ai Hua yacht port in Qingdao, China, with a comparison between two port layouts in design. Wave fields inside the port for different incident wave directions, water levels and return periods are simulated, and then two kinds of parameters are calculated to evaluate the wave conditions for the two layouts. Analyses show that Layout I is better than Layout II. Calculation results also show that the harbor will be calm for different wave directions under the design water level. On the contrary, the wave conditions do not wholly meet the requirements of a yacht port for ship berthing under the extreme water level. For safety consideration, the elevation of the breakwater might need to be properly increased to prevent wave overtopping under such water level. The extended numerical simulation model may provide an effective approach to computing wave heights in a harbor.