三值格代数逻辑函数POS形式最小化

在三值逻辑电路设计中，逻辑函数经常采用POS形式，为此，利用三值K图法最小化规则或者表格法最小化规则，先获得所求三值格代数逻辑函数最小化POS形式的反函数，再利用香农定律，最终可方便地获得该三值逻辑函数最小化POS形式。     

三值逻辑的问题

不真则假,不假就真,只这两种,就是二值逻辑。真假之间还有一种什么,或真假之外还有一种什么,共有三种,就是三值逻辑。日常生活里三分的情况甚多,如说左中右,老中青,过去现在将来等等;未直接涉及真假,只可称为三值,不是三值逻辑。逻辑一向建立在二值的基础上。到了本世纪二十年代,才有三值逻辑问世。真假之外加了一值,但这第三值     

论蒯因对三值逻辑的批评

三值逻辑是20世纪20年代以来发展起来的一种非经典逻辑系统,蒯因对其持批评的态度。蒯因反对三值逻辑的原因有三:一是有些三值逻辑系统建立在错误认识之上;二是有些三值逻辑所关注的问题可以在经典逻辑中得到解决;三是有些三值逻辑系统的建立并不能解决其想解决的问题。蒯因所批评的仅是三值逻辑中违反排中律的部分系统,而非全部,这体现了蒯因关于逻辑真之观念。     

三值逻辑的逻辑哲学反思

由于传统的二值逻辑无法解决诸多命题,三值逻辑乃至其他多值逻辑理论得到了迅速发展,其应用范围也日益广泛。三值逻辑的语义解释存在着很多分歧和“困难”,这并非语义解释自身存在着矛盾,而是因为人们在解释三值逻辑时仍然惯常于使用形而上学的思维方式。     

三值逻辑系统的分析与比较

对诸如未来偶然命题,二值逻辑解决不了,三值逻辑应运而生。如今,三值逻辑理论沿着不同路线已得到迅速发展,其应用范围也日益广泛。主要的三值逻辑系统有L3、B3、K3、R3、P3。它们都对二值逻辑的限制有所突破,都在某种意义上显示出"亦此亦彼"的性质,它们之间以及它们与经典二值逻辑之间具有内在的区别和联系,反映了各自产生的背景与目的。     

三值逻辑与思维规律前三律

针对时下流行的关于思维规律前三律在三值逻辑中失效的观点,本文从辩证法关于普遍性与特殊性的辩证关系原理出发,认为同一律、矛盾律、排中律是为了保证人们正确思维的普遍规律对人类思维具有普遍指导作用,不会在三值逻辑这一具体的思维科学领域内失效;但刻画这三条规律的人工语言表达式具有特殊性,在不同的思维科学中应用不同的表达式去刻画。二值逻辑中刻画中这三个规律的语言表达式在三值逻辑中失去永真式的特殊地位,不能证明这三个思维规律在三值逻辑中失效。     

关系数据库中的信息空缺与三值逻辑

在信息空缺问题的处理中三值逻辑对逻辑代数、关系数据库的影响以及SQL对三值逻辑的支持是数据库中的一个实际问题 .     

三值量子逻辑进路探析

量子测量实验显示部分经典逻辑规则在量子世界中失效.标准量子逻辑进路通过特有的希尔伯特空间的格运算揭示出一种内在于微观物理学理论的概念框架结构,也即量子力学测量命题的正交补模或弱模格,解释了经典分配律的失效,它在形式化方面十分完美,但在解释方面产生了一些概念混乱.在标准量子逻辑进路之外,赖欣巴赫通过引入"不确定"的第三真值独立地提出一种不同的量子逻辑模型来解释量子实在的特征,不是分配律而是排中律失效,但是他的三值量子逻辑由于缺乏标准量子逻辑的上述优点而被认为与量子力学的概率空间所要求的潜在逻辑有很少联系.本文尝试引入一种新的三值逻辑模型来说明量子实在,它有以下优点:(1)满足卢卡西维茨创立三值逻辑的最初语义学假定:(2)克服赖欣巴赫三值量子逻辑的缺陷;(3)澄清标准量子逻辑遭遇的概念混乱;(4)充分地保留经典逻辑规则,特别是标准量子逻辑主张放弃的分配律.     

逻辑函数的三维K图化简

根据K图化简逻辑函数的方法给出三维K图及化简二值、三值逻辑函数的方法,使逻辑函数相邻项的邻接关系得以增强,变量数得以增加.     

反驳威廉姆森关于二值原则的论证

在对模糊性和连锁悖论的研究中,威廉姆森先后构造了三个论证去表明:否定二值原则将导致逻辑矛盾,亦称"荒谬".本文论证以下两个断言:(1)在一个良好设计且能得到很好证成的三值逻辑中,否定二值原则并不会导致荒谬;(2)在威廉姆森的论证中,某些推理步骤只在二值的经典逻辑中有效,而在某些非二值逻辑中无效;那些论证使用了塔斯基的"真"去引号模式,后者本身就预设了二值原则.因此,威廉姆森的三个论证几乎是直接的循环论证:在假定二值原则之后,再证明否定二值原则将导致荒谬.本文最后列出了据以反驳威廉姆森论证的一些思想,并为它们提供了简短的证成和辩护.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.