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Many real-life phenomena, such as computer systems, communication networks, manufacturing systems, supermarket checkout lines as well as structural military systems can be represented by means of queueing models. Looking at queueing models, a controller may considerably improve the system's performance by reducing queue lengths, or increasing the throughput, or diminishing the overhead, whereas in the absence of a controller the system behavior may get quite erratic, exhibiting periods of high load and long queues followed by periods, during which the servers remain idle. The theoretical foundations of controlled queueing systems are led in the theory of Markov, semi-Markov and semi-regenerative decision processes. In this thesis, the essential work consists in designing controlled queueing models and investigation of their optimal control properties for the application in the area of the modern telecommunication systems, which should satisfy the growing demands for quality of service (QoS). For two types of optimization criterion (the model without penalties and with set-up costs), a class of controlled queueing systems is defined. The general case of the queue that forms this class is characterized by a Markov Additive Arrival Process and heterogeneous Phase-Type service time distributions. We show that for these queueing systems the structural properties of optimal control policies, e.g. monotonicity properties and threshold structure, are preserved. Moreover, we show that these systems possess specific properties, e.g. the dependence of optimal policies on the arrival and service statistics. In order to practically use controlled stochastic models, it is necessary to obtain a quick and an effective method to find optimal policies. We present the iteration algorithm which can be successfully used to find an optimal solution in case of a large state space.
This dissertation develops a rationale of how to use fossil data in solving biogeographical and ecological problems. It is argued that large amounts of fossil data of high quality can be used to document the evolutionary processes (the origin, development, formation and dynamics) of Arealsystems, which can be divided into six stages in North America: the Refugium Stage (before 15,000 years ago: > 15 ka), the Dispersal Stage (from 8,000 to 15,000 years ago: 8.0 - 15 ka), the Developing Stage (from 3,000 to 8,000 years ago: 3.0 - 8.0 ka), the Transitional Stage (from 1,000 to 3,000 years ago: 1 - 3 ka), the Primitive Stage (from 5,00 to 1,000 years ago: 0.5 - 1 ka) and the Human Disturbing Stage (during the last 500 years: < 0.5 ka). The division into these six stages is based on geostatistical analysis of the FAUNMAP database that contains 43,851 fossil records collected from 1860 to 1994 in North America. Fossil data are one of the best materials to test the glacial refugia theory. Glacial refugia represent areas where flora and fauna were preserved during the glacial period, characterized by richness in species and endemic species at present. This means that these (endemic) species should have distributed purely or primarily in these areas during the glacial period. The refugia can therefore be identified by fossil records of that period. If it is not the case, the richness in (endemic) species may not be the result of the glacial refugia. By exploring where mammals lived during the Refugium Stage (> 15 ka), seven refugia in North America can be identified: the California Refugium, the Mexico Refugium, the Florida Refugium, the Appalachia Refugium, the Great Basin Refugium, the Rocky Mountain Refugium and the Great Lake Refugium. The first five refugia coincide well with De Lattin- dispersal centers recognized by biogeographical methods using data on modern distributions. The individuals of a species are not evenly distributed over its Arealsystem. Brown- Hot Spots Model shows that in most cases there is an enormous variation in abundance within an areal of a species: In a census, zero or only a very few individuals occur at most sample locations, but tens or hundreds are found at a few sample sites. Locations where only a few individuals can be sampled in a survey are called "cool spots", and sites where tens or hundreds of individuals can be observed in a survey are called "hot spots". Many areas within the areal are uninhabited, which are called "holes". This model has direct implications for analyzing fossil data: Hot spots have a much higher local population density than cool spots. The chances to discover fossil individuals of a species are much higher in sediments located in a "hot spot" area than in a "cool spot" area. Therefore much higher MNIs (Minimum Number of Individuals) of the species should be found in fossil localities located in the hot spot than in the cool spot area. There are only a few hot spots but many cool spots within an areal of a single hypothetical species, consequently only a few fossil sites can provide with much high MNIs, whereas most other sites can only provide with very low MNIs. This prediction has been proved to be true by analysis of 70 species in FAUMAP containing over 100 fossil records. The temporal and spatial variation in abundance can be reconstructed from the temporospatial distribution of the MNIs of a species over its Arealsystem. Areas with no fossil records from the last thousands of years may be holes, and sites with much higher MNIs may be hot spots, while locations with low MNIs may be cool spots. Although the hot spots of many species can remain unchanged in an area over thousands of years, our study shows that a large shift of hot spots occurred mainly around 1,500-1,000 years ago. There are three directions of movement: from the west side to the east side of the Rockies, from the East of the USA to the east side of the Rockies and from the west side of the Rockies to the Southwest of the USA. The first two directions of shift are called Lewis and Clark- pattern, which can be verified with the observations mad by Lewis and Clark during their expedition in 1805-1806. The historical process of this pattern may well explain the 200-year-old puzzle why big game then abundant on the east side were rare on the west side of the Rocky Mountains noted by modern ecologists and biogeographers. The third direction of shift is called Bayham- pattern. This pattern can be tested by the model of Late Holocene resource intensification first described by Frank E. Bayham. The historical process creating the Bayham pattern will challenge the classic explanation of the Late Holocene resource intensification. An environmental change model has been proposed to account for the shift of hot spots. Implications of glacial refugia and hot spots areas for wildlife management and effective conservation are discussed. Suggestions for paleontologists and zooarchaeologists regarding how to provide more valuable information in their future excavation and research for other disciplines are given.
Kandide, oder die beste Welt
(2004)
Voltaires Candide in deutscher Übersetzung. Digitale Reproduktion (im HTML-Format) der 1782 in Berlin bei Christian Friedrich Himburg unter dem Titel "Kandide oder die beste Welt" erschienenen Ausgabe. Übersetzer: Wilhelm Christhelf Sigismund Mylius (1753-1827). Textkodierung: Hans-Ulrich Seifert (Universitätsbibliothek Trier)
This guide is meant to provide some initial bibliographical assistance to those who want to study the historical evolution of ecological thinking in Canada on the basis of poetry. A major theoretical assumption underlying this project is that literature gives privileged access to a nation's cultural memory. Even a cursory survey of Canadian literary history supplies ample evidence for the marked presence of ecological attitudes in Canada's mental history. The origin of these attitudes can be traced back to at least the 18th century. By way of generalising, one could argue that literature reflects, and provides subtle insights into, how both native Canadians and immigrant settlers have responded to their 'eco-sphere'. For many Canadian texts bear witness to a thematic preoccupation with the Canadian oikos-area (oikos signifying 'house' in a narrower sense but also 'habitat' in a wider), to which its inhabitants have established a meaningful relationship. No doubt, even a preliminary attempt to explore ecological attitudes in Canadian literature more systematically would be a multi-facetted and difficult task. One of the major practical problems that poses itself immediately is: Which texts could, and ought to be examined? For there are innumerous references to environmental attitudes and ideas in all literary genres -- also in a great many fictional texts, both traditional and contemporary. For the purpose of research and study it would be extremely helpful indeed, if there were comprehensive bibliographical aids that would enable us to approach, and familiarize ourselves with, all these texts more conveniently. But the challenge of collecting pertinent data of this general kind would have been far beyond my scope and resources. This is why the present guide limits its focus to poetry. The working hypotheses motivating this tentative compilation are: i. Poetry is a more ubiquitous literary genre than fiction and drama. According to available evidence, more writers seem to have tried out their skills on poetry than on fiction and drama. Therefore poetry is likely to mirror a greater variety of voices and sentiments. ii. Poems are still a relatively untapped source in the current discussion about the environment. However, a great many poetic texts lend themselves to supplying relevant arguments that could be used in various fields of action such as environmental ethics, evironmental education and, last but not least, conservation. iii. Apart from smaller pieces of the "nature writing" variety, poems dealing with nature and environmental issues are comparatively short, aiming as they do at a single focus and effect. This is why they can be opened up for critical inspection more easily than selected passages from, say, a novel, which would have to be related to the context of the whole work. iv. This guide attempts to direct the user's attention to poems that are accessible in anthologies. A strong argument for selecting poems from anthologies rather than from individual writers' collections is that the anthology editors are likely to have selected precisely those poems of whose appeal to their respective readerships they must have been thoroughly convinced. Thus the mere fact that a poem has been anthologized suggests that it can be considered an important element in the process of Canadian culture building. Therefore, the very poems that have been frequently anthologized could perhaps serve as special barometers of the Canadian ecological sensibility at a given historical moment.