Parallel Machine Problems with a Single Server and Release Times

Parallel machine problems with a single server and release times are generahzatlons ot classical parallel machine problems. Before processing, each job must be loaded on a machine, which takes a certain release times and a certain setup times. All thesesetups have to be done by a single server, which can handle at most one job at a time. In this paper, we continue studying the complexity result for parallel machine problem with a single and release times. New complexity results are derived for special cases.     

The complexity feature of crust-mantle boundary in Zhangbei seismic region and its tectonic implication

The ProP waveform data obtained from a deep seismic sounding profile, which ran through Zhangbei seismic region, were processed by means of both seismic wave complexity coefficient and frequency spectrum analysis methods, and the complexity characteristics of crest-mantle boundary beneath the studied area and its adjacent region were determined. The results show that the place below epicenter can be taken as boundary, the northern side of which is Inner Mongolia axis with small complexity coefficient and the southern side of which is Huai＇an basin with large complexity coefficient. The different spectrum patterns at the two sides of the epicenter were inferred from spectrum analysis. In the epicentral area, there have been multi-period magmatic eruptions since Meso-Cenozoic and craters exist at the surface. From the velocity imaging of middle and upper crust in Zhangbei seismic region it can be found that there are crustal low velocity bodies around the craters and also there are low velocity zones, which went into deep crust. It is suggested that the distinct zones of crust-mantle boundary complexity may be the margin, where the magma had intruded due to magma activity in Meso-Cenozoic. The southern side with large complexity coefficient is deep magmatic activity area and the northern side with small complexity coefficient is stable crust-mantle tectonics. The difference of crust-mantle complexity provides deep background for the development of strong earthquake.     

A comparison of drainage networks derived from digital elevation models at two scales

Automated generation of drainage networks has become increasingly popular with powerful analytical functions in geographic information systems (GIS) and with the increased availability of digital elevation models (DEMs). This paper compares drainage networks derived from DEMs at two scales, 1:250 000 (250K) and 1:24 000 (24K), using various drainage parameters common in hydrology and geomorphology. The comparison of parameters derived from the 250K DEMs with those from the 24K DEMs in 20 basins ranging from 150 to 1000 km² in West Virginia shows that the goodness-of-fit between parameter estimates based on the DEMs varies. Results clearly show that superior estimations are produced from the 24K DEMs. Better estimates can be obtained from the 250K DEMs for stream length and frequency parameters than for gradient parameters. However, the estimation of the mean gradient parameters based on the 250K DEMs seems to improve with increasing terrain complexity. Finally, basin size does not strongly affect the accuracy of parameter estimates based on the 250K DEMs.     

Identification of seismic events based on stochastic properties of the short-period records

Discrimination between underground nuclear explosions and natural earthquakes is considered based on a nonstationary stochastic model which incorporates a well-known deterministic formulation. Using the relevant parameters in the model a discriminating procedure is described and its application is illustrated using available P-wave records. A formal definition is presented for a geophysical feature known as ‘complexity’ and its relationship to the best linear discriminant function is pointed out. Considering the possibility of a two-dimensional discriminant, a second discriminating method based on seismic moments is considered and reasons for its appropriateness are presented. Using number of zero-crossings, a simple and computationally convenient estimator is introduced for the second discriminant. Some discussion concerning application of these techniques together with a detailed explanation concerning relationship between crossings of the original continuous records and their digitized version is also included.     

Complexity and Self-Organized Criticality of Solid Earth System(Ⅱ)

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河南及邻区中等地震前地震活动性异常

采用“八五”地震预报攻关研究成果－－地震算法复杂性Ｃ（ｎ）值及地震强度因子Ｍｆ值时间扫描，对河南及邻区１２次中等以上地震进行单项和综合分析研究。结果表明，对应率达８０％，显示出这些方法具有一定的预报意义。     

基于多层索引结构的联合熵算法研究

针对多维联合熵时空复杂度问题,提出了一种基于多层索引结构的联合熵算法,提高了常规算法效率,具有良好的稳定性,适合于三维及更高维联合熵的计算。     

城市地质环境复杂程度与灾害的相关性

城市地质环境是一个多因素相互叠加和交织的环境空间，其复杂性难以判定。为了建立地质环境指标体系，本文以地形地貌、岩性、构造、水文、不良物理地质现象、人类活动等影响因素作为基本要素，将地质环境复杂程度划分为地质环境复杂、中等复杂及简单三类，力图寻找地质环境的复杂程度与地质灾害易发程度的相关性，为计算机辅助解决城市环境整体化决策支持系统奠定基础。     

地球系统科学中的复杂性思维与可持续发展

地球系统科学是可持续发展的理论基础。地球系统8个方面的复杂性和非线性决定和构成了地球系统科学中复杂性思维的基本特征。可持续发展作为新的发展模式需要考虑具有非线性相互作用的不同层次、不同方面的多种因素．必然要求运用复杂性思维来综合分析解决人口-资源-环境-发展的互相协调。因此．地球系统科学中的复杂性思维是处理可持续发展问题的科学武器．有助于人们深刘认识地球演化的内在机理和人-地关系的变化。