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題 名 | An Analysis of the Dynamics of Agroecosystems Via the Viewpoint of Engineering Cybernetics=由工程控制學觀點分析農業生態系統之動態行為 |
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作 者 | 廖中明; | 書刊名 | 農業工程學報 |
卷 期 | 37:2 1991.06[民80.06] |
頁 次 | 頁14-24+ |
分類號 | 430.1633 |
關鍵詞 | 工程控制學; 分析; 生態; 農業; |
語 文 | 英文(English) |
中文摘要 | 本文乃從工程控制學觀點以邏輯--數學方法分析一描述農業生態系統動態行為之假設模式。模式結構之關鍵為一輸出係數矩陣,[B(k)]。由[B(K)]矩陣之熱力學特性及主特徵值的數學性質可知此一封閉農業生態系統具有一零成長率,且當廢棄物產生時將會迫使該系統做一適切的矯正。若此農業生態系統之控制程序可由受控之技術變化來定義,則該農業生態系統之行為便可由線性反饋控制系統來描述。該控制系統之狀態變數為資源數量,而控制變數則為廢棄物數量。控制輸出則可由系統之廢棄物函數來表示。由模式反饋機構可顯示出如果農業生態系統具可控制性,則所有資源會受系統的影響,若農業生態系統具不可觀測性,則間接以廢棄物為基控制量測值對受控程序並不能確定其影響效力。 |
英文摘要 | A logical-mathematical analysis of an axiomatic model describing the dynamic behavior of an agroecosystem is presented from the standpoint of engineering cybernetics. The key point of the model structure is an output coefficient matrix [B(k)]. From characteristics of thermodynamics and mathematical properties of dominant eigenvalue of matrix [B(k)], the closed agroecosystem has a zero growth rate and will force an adjustment on itself when wastes are generated. A control process is defined as the controlled technological change. Thus the linear feedback control system can be used to describe the behavior of the agroecosystem. The state variables of the control system are resource quantities, and the control variables are residual quantities. Control outputs are yielded by the residuals of the system. The model feedback mechanisms show that if the agroecosystem is controllable, then the every resources are affected by the system. If the agroecosystem is unobservable, the application of residuals as control measures will have indeterminate effect on the controlled processes. |
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