scholarly journals Structure of multivalued dependencies in relation scheme

2016 ◽  
Vol 14 (3) ◽  
pp. 42-44
Author(s):  
Hồ Thuần ◽  
Lê Văn Bào ◽  
Hồ Cẩm Hà

As pointed out in [1], Multivalued dependencies (MVD) depend on the context in which they are defined and thus are very hard to visualize. In this paper, continuing the study in [1], we give some results which may provide some more insight regarding the existence of possible MVDs in the relation schemes provided all their FDs are known in advance. Throughout this paper, we assume that the reader is familiar with the basic concepts of the relational database [2,3].   Tóm tắt. Như đã chi rõ trong [1], các phụ thuộc đa trị (MVD) phụ thuộc vào ngữ cảnh trong đó chúng đươc xác đinh và do đó rất khó phát hiện. Trong bài báo này, tiếp tục hướng nghiên cứu trong [1], chúng tôi dưa ra môt số kết quả làm sáng tỏ sự tồn tại của các MVD trong các lược dồ quan hệ vói tất cả các phụ thuộc hàm (FD) đã biết trước.

Author(s):  
Wen-Chen Hu

The introduction to Palm OS programming given in the previous chapter provided an overview of its structure and basic concepts. This chapter examines an advanced aspect of Palm OS programming, focusing on one major subject that is particularly relevant for handheld devices: forms. User interfaces such as check boxes and radio buttons can be contained in a form, allowing users to enter data that is, typically, then sent to a server for processing. It is important to note that this topic was selected to allow the reader to become familiar with how Palm OS operates; for other Palm OS topics such as databases and menus, readers may check the section later in this chapter on Palm OS References for further information. • In Palm OS, every file is a database, which is similar to the persistent storage of J2ME. A Palm database does not correspond to a “relational database” but is actually closer to a structured, flexible, and mobile binary data file. • A menu bar is displayed whenever the user taps a menu icon. The menu bar is also displayed when the user taps in a form’s titlebar. The menu bar, a horizontal list of menu titles, appears at the top of the screen in its own window, above all the application windows.


1977 ◽  
Vol 8 (1) ◽  
pp. 23-32
Author(s):  
Gerald E. Chappell

Test-teach questioning is a strategy that can be used to help children develop basic concepts. It fosters the use of multisensory exploration and discovery in learning which leads to the development of cognitive-linguistic skills. This article outlines some of the theoretical bases for this approach and indicates possibilities for their applications in child-clinician transactions.


1988 ◽  
Vol 16 ◽  
pp. 137-141 ◽  
Author(s):  
Amelia Ouellette ◽  
Robert Casteel
Keyword(s):  

2016 ◽  
Vol 1 (6) ◽  
pp. 47-54 ◽  
Author(s):  
Jeffrey J. DiGiovanni ◽  
Travis L. Riffle

The search for best practices in hearing aid fittings and aural rehabilitation has generally used the audiogram and function stemming from peripheral sensitivity. In recent years, however, we have learned that individuals respond differently to various hearing aid and aural rehabilitation techniques based on cognitive abilities. In this paper, we review basic concepts of working memory and the literature driving our knowledge in newer concepts of hearing aid fitting and aural rehabilitation.


1973 ◽  
Vol 6 (1) ◽  
pp. 63-65 ◽  
Author(s):  
Theodore A. Dahl
Keyword(s):  

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