检索结果-内蒙古大学图书馆

A method of generating objective functions for probability estimation

ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE 1996年第2期9卷 205-208页

作者： Billa, J ElJaroudi, A UNIV PITTSBURGH DEPT ELECT ENGNPITTSBURGHPA 15261

Multi-Layer Neural Networks (MLNNs) have been known to be used to model the statistical properties of their training data. Several authors have shown that, depending on the objective function chosen, MLNNs estimate the posterior class probabilities of their inputs, provided the network is trained with binary desired outputs. If has recently been shown that conditions exist that define a general class of objective functions which provide probability estimates. This paper introduces a method of generating such objective functions. This generator is simple to use, and so far has been found to be universally applicable. Known objective functions, which include the mean-squared error (MSE) and the cross entropy (CE) measure, are generated here as examples of its application. To demonstrate the potential of this method a new objective function is derived and discussed. This work provides practising engineers with an explicit method for generating objective functions that could be used in their classification applications. Copyright (C) 1996 Elsevier Science Ltd

关键词： objective functions probability estimation neural network statistics minimization classification mean-squared error cross entropy function

来源：评论

学校读者我要写书评

暂无评论

Advancing objective functions in hydrological modelling: Integrating knowable moments for improved simulation accuracy

引用

JOURNAL OF HYDROLOGY 2024年 634卷

作者： Pizarro, Alonso Jorquera, Joaquin Univ Diego Portales Escuela Ingn Obras Civiles Santiago 8370109 Chile

Runoff prediction is a crucial aspect of water resource management and risk mitigation. Despite hydrological modelling plays a vital role in accurately representing catchment behaviour, calibration still poses a significant challenge. This study explores the use of knowable moments (KMoments), a category of high -order statistical moments, as part of the core of objective functions in hydrological model calibration. Traditional objective functions, such as Nash -Sutcliffe Efficiency (NSE) and Kling -Gupta Efficiency (KGE), often make assumptions about data distribution and are sensitive to outliers. KMoments offer a promising alternative by enabling reliable estimation and effective description of high -order statistics from typical hydrological samples and therefore, reducing uncertainty in their estimation and computation of the objective functions in question. Three daily lumped hydrological models (GR4J, VIC, and HYMOD) were employed to test the performance of different calibration strategies using KMoments-based objective functions and compare them with conventional approaches. The hydrological consistency of the simulations was also assessed through 27 hydrological signatures. Our findings highlight the advantages of using KMoments, including improved performance metrics and enhanced hydrological signature reproduction. The findings contribute to advancing hydrological modelling techniques and provide valuable insights for researchers and practitioners seeking to enhance simulation accuracy and reliability.

关键词： Hydrological modelling Calibration strategies objective functions Knowable moments Large-sample hydrology

来源：评论

学校读者我要写书评

暂无评论

Comparison of two objective functions for optimization of simultaneous multi-element determinations in inductively coupled plasma spectrometry

引用

JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY 1997年第1期12卷 13-19页

作者： Sartoros, C Salin, ED Department of Chemistry McGill University

Two objective functions for multi-element optimization in ICP-AES were compared using signal-to-background ratios as a figure of merit. Complete three-dimensional response surfaces were generated for a number of elements (Ca, Cu, Al, Na, Ni, Mn and Ba) and two artificial 'elements' to evaluate the performance of both objective functions in locating the optimum compromise instrumental operating conditions in multi-element determinations, In the determination of the best compromise instrument operating conditions for most combinations of the elements used, both objective functions performed equally well;however, one occasionally performed significantly better than the other.

关键词： multi-element optimization inductively coupled plasma atomic emission spectrometry objective functions

来源：评论

学校读者我要写书评

暂无评论

Reducing uncertainties in urban drainage models by explicitly accounting for timing errors in objective functions

引用

URBAN WATER JOURNAL 2021年第9期18卷 740-749页

作者： Broekhuizen, Ico Leonhardt, Gunther Viklander, Maria Lulea Univ Technol Dept Civil Environm & Nat Resources Engn Lulea Sweden

Traditional hydrological objective functions may penalize models that reproduce hydrograph shapes well, but with some shift in time;especially for urban catchments with a fast hydrological response. Hydrograph timing is not always critical, so this paper investigates alternative objective functions (based on the Hydrograph Matching Algorithm) that try to mimic visual hydrograph comparison. A modified version of the Generalized Likelihood Uncertainty Estimation is proposed to compare regular objective functions with those that account for timing errors. This is applied to 2-year calibration and validation data sets from an urban catchment. Results show that such objective functions provide equally reliable model predictions (they envelop the same fraction of observations), but with more precision, i.e. smaller estimated uncertainty of model predictions. Additionally, identifiability of some model parameters improved. Therefore objective functions based on the Hydrograph Matching Algorithm can be useful to reduce uncertainties in urban drainage modelling.

关键词： Urban drainage calibration objective functions timing uncertainty predictive uncertainty

来源：评论

学校读者我要写书评

暂无评论

A Comparative Study Based on objective functions for Optimum Coordination of Overcurrent Relays 7

A Comparative Study Based on Objective Functions for Optimum...

引用

7th International Conference on Power Systems (ICPS)

作者： Shah, Jay Khristi, Nirmal Rajput, V. N. Pandya, K. S. Dr Jivraj Mehta Inst Technol Dept Elect Engn Anand Gujarat India Charotar Univ Sci & Technol Dept Elect Engn Changa India

ISBN: (纸本)9781538617892

In the optimum coordination of Directional Overcurrent Relays (DOCRs), operational time of relays is minimized with maintaining coordination criteria between Primary and Backup (P/B) relay pairs. In the literature, a range of objective functions (OFs) including constraints with various weightings are developed to obtain the optimum coordination of relays. In this paper, the performance of different OFs is evaluated on IEEE 30-bus system using Sequential quadratic Programming (SQP). The comparative analysis is executed to find the best OF for the coordination problem of DOCRs.

关键词： directional overcurrent relays objective functions power system protection sequential quadratic programming

来源：评论

学校读者我要写书评

暂无评论

Analysis of RPL objective functions with Security Perspective

Analysis of RPL Objective Functions with Security Perspectiv...

引用

11th International Conference on Sensor Networks (SENSORNETS)

作者： Dogan, Cansu Yilmaz, Selim Sen, Sevil Hacettepe Univ Dept Comp Engn WISE Lab Ankara Turkey Mugla Sitki Kocman Univ Dept Software Engn Mugla Turkey

ISBN: (纸本)9789897585517

The IPv6 Routing Protocol for Low Power Lossy Networks (RPL) is one of the standardized routing protocols for lossy networks consisting of resource-constrained Internet of Things (IoT) devices. RPL allows to use different objective functions based on different routing metrics such as expected transmission count (ETX), hop count, and energy to determine effective routes. In the literature, the performance of two objective functions namely objective Function Zero (OF0), Minimum Rank with Hysteresis objective Function (MRHOF) are evaluated thoroughly, since they are accepted as standard objective functions in RPL. However their performance under attack has not been evaluated comprehensively yet. Although RPL has defined some specifications for its security, it is still vulnerable to insider attacks, which could dramatically affect the network performance. Therefore, this study investigates how the performance of objective functions are affected by RPL specific attacks. Version number, DIS flooding, and worst parent attacks are analyzed by using the following performance metrics: packet delivery ratio, overhead, latency, and power consumption. Moreover, how they are affected by the number of attackers in the network are analyzed. To the best of the authors' knowledge, this is the first study that comprehensively explores RPL objective functions on networks under attacks.

关键词： Internet of Things Routing Protocol RPL objective functions RPL Security RPL Attacks

来源：评论

学校读者我要写书评

暂无评论

Neural network objective functions for detection problems

Neural network objective functions for detection problems

引用

1997 South African Symposium on Communications and Signal Processing (COMSIG 97)

作者： Weber, D Breitenbach, J Univ Stellenbosch Dept Elect & Elect Engn ZA-7602 Matieland South Africa

ISBN: (纸本)0780341732

We examine the effects of the choice of neural network objective (criterion) functions on the ability of the neural network to perform detection. The experiments are performed using a multilayer perceptron with the mean square error, classification figure of merit (CFM), maximally hat CFM and the modified perceptron error objective functions. We develop a thresholding scheme for the outputs of the neural network in order to obtain receiver operating characteristic (ROC) curves for the various objective functions. We perform preliminary tests on a breast cancer cell detection problem.

关键词： objective functions detection receiver operating characteristics neural networks

来源：评论

学校读者我要写书评

暂无评论

ON TRAINING TARGETS AND objective functions FOR DEEP-LEARNING-BASED AUDIO-VISUAL SPEECH ENHANCEMENT 44

ON TRAINING TARGETS AND OBJECTIVE FUNCTIONS FOR DEEP-LEARNIN...

引用

44th IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Michelsanti, Daniel Tan, Zheng-Hua Sigurdsson, Sigurdur Jensen, Jesper Aalborg Univ Dept Elect Syst Aalborg Denmark Oticon AS Smorum Denmark

ISBN: (纸本)9781479981311

Audio-visual speech enhancement (AV-SE) is the task of improving speech quality and intelligibility in a noisy environment using audio and visual information from a talker. Recently, deep learning techniques have been adopted to solve the AV-SE task in a supervised manner. In this context, the choice of the target, i.e. the quantity to be estimated, and the objective function, which quantifies the quality of this estimate, to be used for training is critical for the performance. This work is the first that presents an experimental study of a range of different targets and objective functions used to train a deep-learning-based AV-SE system. The results show that the approaches that directly estimate a mask perform the best overall in terms of estimated speech quality and intelligibility, although the model that directly estimates the log magnitude spectrum performs as good in terms of estimated speech quality.

关键词： Audio-visual speech enhancement deep learning training targets objective functions

来源：评论

学校读者我要写书评

暂无评论

The governance structures of Japanese credit associations and their objective functions

引用

APPLIED ECONOMICS LETTERS 2019年第8期26卷 628-632页

作者： Kondo, Kazumine Aichi Gakuin Univ Fac Econ Nagoya Aichi Japan

Although Japanese credit associations are non-profit cooperative financial institutions, they assume the same financial functions as regional banks that are stock companies and they could compete with each other in a regional market. On the other hand, the governance structures of credit associations tend to exhibit weaker discipline than those of regional banks, and, for this reason, the financial performances of credit associations and regional banks might differ. In this article, we empirically investigated whether the objective functions of credit associations are different from those of regional banks considering their different governance structures. As a result, although significant differences of profitability of these two types of institutions were not detected, it was demonstrated that credit associations can capture a greater share of deposits than regional banks and the former are more conservative in risk taking than the latter. From these, there is a possibility that Japanese credit associations have different objective functions from regional banks.

关键词： Governance structures objective functions labour expenses credit associations regional banks

来源：评论

学校读者我要写书评

暂无评论

Alternative objective functions for Firms

引用

ORGANIZATION & ENVIRONMENT 2018年第3期31卷 242-262页

作者： Lankoski, Leena Smith, N. Craig Aalto Univ Sch Business Helsinki Finland INSEAD Eth & Social Responsibil Fontainebleau France

The predominant view of the role of business in society is that the objective of business is to maximize profit. Some argue that it ought to be something different. Others argue that for many firms it already is something different. However, the something different has not been fully fleshed out in its various versions. To address this gap, we define different relationship types between variables in an objective function and develop and present the resulting range of 10 alternative objective functions for firms. We then discuss how their development contributes to conceptual, empirical, and normative debates about organizational purpose. Removing the conventional assumption of profit maximization as the sole management principle opens up the possibility of new, more nuanced theoretical approaches to management. This article lays the groundwork for such theory development through the systematic and analytical identification of alternative objective functions that represent different specifications of firm purpose.

关键词： role of business in society organizational purpose objective functions corporate objectives hybrid organizations social enterprises profit maximization corporate social responsibility sustainability creating shared value

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：