Sekine, M., Nakanishi, H., Ukita, M., & Murakami, S. (1991). A shallow-sea ecological model using an object-oriented programming language (Vol. 57).
Zusammenfassung: The purpose of this study is to construct a model that can predict the impact on fisheries caused by coastal development activities. To accomplish this, many species of fish must be incorporated in the model, because each type of fish has a different value as a fishery resource and a different behavior for the same impact. In addition the effect of fish swimming must be considered because even when the total resource amount of fish does not change, fish may still disappear from the object area. These factors make the model structure complicated. Meanwhile, a new concept called “object oriented programming” (OOP) is attracting the attention of modellers. In this paper, we have constructed a model called the “shallow-sea ecological model” (SSEM), by using Smalltalk, which is representative of the OOP language. This showed that the fishing ground environment are expressed very flexibly and plainly by Smalltalk.
Schlüsselwörter: Ökosystem, modell, oop, methode, theorie
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Fiedler, K. (1991). Lehrbuch der Speziellen Zoologie. Band II – Wirbeltiere. 2. Teil – Fische. Jena: Fischer Verlag.
Schlüsselwörter: Zoologie, Biologie, Ökologie, Taxonomie, Systematik, Fisch
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Stal, M. (1991). Systeminterna nach INI-Art.
Schlüsselwörter: Windows, tips
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Schmidt, G. W. (1991). Versuche zur Wiedereinbürgerung des Lachses, Salmo salar L., in den Rhein-Nebenfluss Sieg (Vol. 5).
Schlüsselwörter: Wiedereinbürgerung, Lachs, Salmo salar, Fisch, Sieg
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Yamagishi, H., & Ishioka, K. (1991). Silumation Study on the Growth Variation of Fish with Special Reference to the Mortality by Cannibalism.
Zusammenfassung: In respect to the higher initial mortality in fish by cannibalism, computer simulation of individual growth variation was made in terms of coefficient of variation(CV) and skewness(sk) of frequency distribution. CV of the cannibalistic groups changed similarly to the control groups, but converged on smaller values than the asymptotic CV of the control groups. Sk of the cannibalistic groups finally converged on similar values to those of the control groups after irregular changes in positive values except N-N correspondent type.
Schlüsselwörter: Wachstum, mortalitÄt, simulation, methode, theorie, statistik
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Brand, T. (1991). Gescheiter Weichensteller.
Schlüsselwörter: Turbo-pascal, listing, ms-dos, methode, tool
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Groeneveld, T. (1991). Binäre Beine – Sicherer Stand bei Suchalgorithmen in C++.
Schlüsselwörter: Turbo-c, oop, sortieren, methode, Grundlage
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Groeneveld, T. (1991). C++ für Aufsteiger.
Schlüsselwörter: Turbo-c, oop
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Gerdes, M. (1991). Zwei Fliegen mit einer Klappe.
Schlüsselwörter: Tsr, treiber, betriebssystem, assembler, Grundlage
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Ganguly, S., & Chaudhuri, K. (1991). A note on an extension of Schaefer's model (Vol. 55).
Zusammenfassung: Schaefer's model on the exploitation of a single species fish community obeying the logistic law of growth has been modified by adopting an alternative functional form for the harvest rate. The stability of the nontrivial steady state is discussed. The existence of a bionomic equilibrium is proved. The problem for optimal exploitation of the fishery is studied by using variational calculus. Some results are numerically computed to make a comparative study of Schaefer's model and the present one.
Schlüsselwörter: Statistik, population, modell, algorithmus
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