BEMAS: A Belief Maintenance System Prototype User\u27s Manual

This paper is a user\u27s manual for BEMAS, a Belief Maintenance System. BEMAS is a menu driven system which provides an easy to use interface between a user and a knowledge base. Given a set of data, and a set of rules, BEMAS will help the user to identify an object by analyzing the properties of that object. Data can be added and deleted at any time, either directly or by deleting beliefs on which the data is dependent. BEMAS maintains the relations and dependencies between data using a dynamic dependency net. BEMAS also has the capability to make inferences using incomplete information while still maintaining knowledge base integrity

A random walker on a ratchet

We analyze a model for a walker moving on a ratchet potential. This model is motivated by the properties of transport of motor proteins, like kinesin and myosin. The walker consists of two feet represented as two particles coupled nonlinearly through a bistable potential. In contrast to linear coupling, the bistable potential admits a richer dynamics where the ordering of the particles can alternate during the walking. The transitions between the two stable states on the bistable potential correspond to a walking with alternating particles. We distinguish between two main walking styles: alternating and no alternating, resembling the hand-over-hand and the inchworm walking in motor proteins, respectively. When the equilibrium distance between the two particles divided by the periodicity of the ratchet is an integer, we obtain a maximum for the current, indicating optimal transport.Comment: 10 pages, 5 figure

A Study on Seedling Pushing Mechanism of Rice Transplanter

In this study ,the analysis of the seedling pushing mechanism had been undertaken. The guidelines of designing a cam mechanism had been also established. Measurment on the vibration induced by the mechanism had been carried out. The cubic spline function was used to synthesize the profile f the cam while the jerk of pushing rod was minimized.e mechanism construced with various new design of cam and some spring was investigated. Furthermore, a transplanting experiment was conducted to evaluate the performance of the mechanism. The results of this study are summarized in the following : 1.Inappropriate design of the pushing mechanism may cause the transplanted seedling to be floated or oblique, but it plays no role in seedling to be vacated or get hurt. 2.The guidelines of designing a cam mechanism and selecting a pushing springs have been established. 3.The methodology of designing a cam mechanism development in this study can be applied to other similar mechanism of the the agricultural machinary.本研針對插秧機秧苗推出機構進行分析，以建立推出凸輪與相關機械元件 設計應注意之準則，同時進行秧苗推出機構運動產生之振動量測試驗，繼 而利用 cubic spline 合成曲線規劃設計凸輪之輪廓，使秧苗推出桿在運 動中所產生之急衝度最小，進而選用合適之推出彈簧，組合完整之推苗機 構，以期修改後之機構，可降低機構之振動，並進行實際插植試驗，建立 秧苗推出機構與插植性能之關係． 研究結果歸納如下: 1.確立推苗機 構與缺株﹑傷苗等插植性能並無顯著之關係，而與倒伏與浮苗有關。 2.建立推出凸輪之設計依據與推出彈簧之選用準則。 3.本研究中所使用 之凸輪設計法，可應用於農機上其它高速凸輪之設計