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61.
In this paper we show that optimal trading results can be achieved if we can forecast a key summary statistic of future prices. Consider the following optimization problem. Let the return ri (over time i=1, 2, ..., n) for the ith day be given and the investor has to make investment decision di on the ith day with di=1 representing a ‘long' position and di=0 a ‘neutral' position. The investment return is given by r=Σni=1ridi−cΣn+1i=1∣di−di−1∣, where c is the transaction cost. The mathematical programming problem of choosing d1, ..., dn to maximize r under a given transaction cost c is shown to have an analytic solution, which is a function of a key summary statistic called the largest change before reversal. The largest change before reversal is recommended to be used as an output in a neural network for the generation of trading signals. When neural network forecasting is applied to a dataset of Hang Seng Index Futures Contract traded in Hong Kong, it is shown that forecasting the largest change before reversal outperforms the k‐step‐ahead forecast in achieving higher trading profits. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献
62.
Babitt JL Huang FW Wrighting DM Xia Y Sidis Y Samad TA Campagna JA Chung RT Schneyer AL Woolf CJ Andrews NC Lin HY 《Nature genetics》2006,38(5):531-539
Hepcidin is a key regulator of systemic iron homeostasis. Hepcidin deficiency induces iron overload, whereas hepcidin excess induces anemia. Mutations in the gene encoding hemojuvelin (HFE2, also known as HJV) cause severe iron overload and correlate with low hepcidin levels, suggesting that hemojuvelin positively regulates hepcidin expression. Hemojuvelin is a member of the repulsive guidance molecule (RGM) family, which also includes the bone morphogenetic protein (BMP) coreceptors RGMA and DRAGON (RGMB). Here, we report that hemojuvelin is a BMP coreceptor and that hemojuvelin mutants associated with hemochromatosis have impaired BMP signaling ability. Furthermore, BMP upregulates hepatocyte hepcidin expression, a process enhanced by hemojuvelin and blunted in Hfe2-/- hepatocytes. Our data suggest a mechanism by which HFE2 mutations cause hemochromatosis: hemojuvelin dysfunction decreases BMP signaling, thereby lowering hepcidin expression. 相似文献
63.
64.
S. H. Chung J. C. Hwang Y. S. Chan Y. M. Cheung K. B. Fung 《Cellular and molecular life sciences : CMLS》1979,35(2):216-217
Summary A simple, low cost interspike interval analyzer for the analysis of trains of nerve impulses is described. The analyzer is built with readily available integrated circuits and has been used to analyze spike trains in the lateral vestibular nucleus of cats.Acknowledgment. This research is supported in part by Higher Degrees and Research Grant No. 158/363 to J.C.H. from the University of Hong Kong. 相似文献
65.
Summary Host cell reactivation capacity for ozonated or irradiated phage was determined for different strains ofE. coli either more sensitive or resistant to ozone than the wild type strain. The results suggest that theozr gene product could be involved in the same repair pathway for ozone-induced lesions on DNA as thepolA gene. The possible involment of a specific endonuclease for these lesions is also considered.This research was sponsored by the National Sciences and Engineering Research Council of Canada. P.L.H. acknowledges a postgraduate scholarship from the NSERC of Canada. 相似文献
66.
M. P. Singh Y. S. Chung J. Greenberg 《Cellular and molecular life sciences : CMLS》1973,29(10):1298-1299
Résumé L'efficacité de la nitrosoguanidine (MNG) dans différents milieux de culture et tampons a été étudiée. Les résultats obtenus montrent qu'avec le temps, la fraction de cellules survivant au traitement diminue progressivement alors que la fréquence de mutation augmente dans tous les milieux. L'activité de cet agent atteint un maximum dans le milieu DM-glucose tandis que dans le tampon TM elle est à son plus bas niveau. 相似文献
67.
In recent years,e-learning system has been adopted as a training tool in many firms,as it can help employees to complete training in a short time and at a low cost.Within this context,since 2003 the Industrial Development Bureau(IDB) of the Ministry of Economic Affairs(MOEA) in Taiwan sponsored more than 50 enterprises each year to help them implement customized e-learning systems. Past research on e-learning mostly focused on one criterion and adopted regression approach,such as examining the relationsh... 相似文献
68.
针对极端学习机(ELM)不能用于多层前向神经网络学习的问题,通过揭示单层前向神经网络(SLFN)的ELM与岭回归以及中心化的岭回归之间的关系,提出了SLFN的最小学习机.通过证明核化的中心化岭回归与核化的PCA之间的关系.提出以无限可微的核函数为激励函数的多层前向神经网络(MLFN)的最小学习机LLM.SLFN/MLFN的最小学习机能够保持ELM的上述优势. 相似文献
69.
Qingling Zhu Sirui Cao Fusheng Chen Ming-Cheng Chen Xiawei Chen Tung-Hsun Chung Hui Deng Yajie Du Daojin Fan Ming Gong Cheng Guo Chu Guo Shaojun Guo Lianchen Han Linyin Hong He-Liang Huang Yong-Heng Huo Liping Li Na Li Shaowei Li Yuan Li Futian Liang Chun Lin Jin Lin Haoran Qian Dan Qiao Hao Rong Hong Su Lihua Sun Liangyuan Wang Shiyu Wang Dachao Wu Yulin Wu YU XU Kai Yan Weifeng Yang Yang Yang Yangsen Ye Jianghan Yin Chong Ying Jiale Yu Chen Zha Cha Zhang Haibin Zhang Kaili Zhang Yiming Zhang Han Zhao Youwei Zhao Liang Zhou Chao-Yang Lu Cheng-Zhi Peng Xiaobo Zhu Jian-Wei Pan 《科学通报(英文版)》2022,(3):240-245
To ensure a long-term quantum computational advantage,the quantum hardware should be upgraded to withstand the competition of continuously improved classical al... 相似文献
70.
阮重光 《国外科技新书评介》2005,5(7):13-14
本书是《可扩充计算》丛书的第5卷。全书是由4篇综述组成的。第1篇不规则算法的并行计算策略,考虑了三个具有代表性的不规则应用;无结构重啮合、稀疏矩阵计算和N体问题。第2篇在群与网格上的大规模不规则计算的实时支持,介绍了一个正在形成的计算基础结构——在计算群集和计算网格上实施不规则数据密集应用的一种综合方法,即想法、技术、概念及软件结构;提出了并行化策略和一个叫做lib的运行时程序库,该程序库支持不规则与缺乏核心的计算,并且介绍了在安装有建立于lib基础上的软件的PC以及工作站群集所获得的试验执行结果。 相似文献