SU1580396A1

SU1580396A1 - Device for information search

Info

Publication number: SU1580396A1
Application number: SU884483469A
Authority: SU
Inventors: Вячеслав Григорьевич Попов; Сергей Александрович Удинцев
Original assignee: Пушкинское высшее училище радиоэлектроники противовоздушной обороны
Priority date: 1988-09-16
Filing date: 1988-09-16
Publication date: 1990-07-23

Abstract

Изобретение относитс к вычислительной технике и может быть использовано в системах управлени базами данных. Цель изобретени - упрощение устройства. Устройство содержит регистр 1, элемент И 3, элемент 15 задержки, генератор 19 импульсов, группы 2, 13 и 14 элементов И, группу 10 элементов ИЛИ, регистр 11, элемент 4 сравнени , регистр 5, блок 12 пам ти, триггеры и элементы ИЛИ. Устройство обеспечивает поиск записи с заданным ключом с любого адреса исходного массива, представл ющего собой бинарную древовидную структуру, в которой кажда запись сопровождаетс , кроме того, левым и правым указател ми. В пол х указателей узлов бинарного дерева, не имеющих непосредственных потомков, содержитс ссылка на корень. Если поиск начинаетс с левого поддерева записи, наход щейс в правом поддереве, то производитс нахождение корн , а затем переход в правое поддерево. При отсутствии записи процедура поиска обеспечивает двойное прохождение корн , на основе которого формируетс сигнал "Отсутствие записи". 3 ил.The invention relates to computing and can be used in database management systems. The purpose of the invention is to simplify the device. The device contains register 1, element 3, delay element 15, pulse generator 19, groups 2, 13 and 14 elements AND, group 10 elements OR, register 11, comparison element 4, register 5, memory block 12, triggers and elements OR . The device provides a search for a record with a given key from any address in the original array, which is a binary tree structure, in which each record is also accompanied by left and right pointers. In the field of pointers of the binary tree nodes that have no immediate descendants, there is a link to the root. If the search starts from the left subtree of the record located in the right subtree, then the root is found and then the transition is made to the right subtree. In the absence of a record, the search procedure provides a double pass of the root, on the basis of which the "No Record" signal is formed. 3 il.

Description

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Claims

Claim

An information retrieval device containing a group of OR elements, three groups of AND elements, a memory unit, three registers, a comparison element, four elements of AND, a delay element, a pulse generator and two OR elements, the output of the pulse generator is connected to the first input of the first AND element, the output which through the delay element is connected to the first inputs of the AND elements of the first and second groups and the first inputs of the second and third AND elements, the first inputs of the OR elements of the group are the address input of the device, the outputs of the AND elements of the first and second items are connected to the second and third inputs of the elements of the OR group, respectively, the outputs of the elements of the OR group are connected to the information inputs of the first register, the output of which is connected to the address input of the memory block, the output of which is connected to the information input of the second register, the outputs of the data bits of which are connected to the first inputs of the elements And the third group, the outputs of which are the information outputs of the device, the output of the first element θ

And connected to the gate input of the second + second register, the outputs of the bits of the left and right pointers 'which are connected to the second inputs of the elements AND of the first and second groups, respectively, the output of the third element And is connected to the second inputs of the elements AND' of the third group and the first input of the first OR element, the outputs of the key switch-jg are recorded in the second register with the first input of the comparison element and the inputs of the second element OR, output-. which is connected to the second input of the second AND element and the first input of the fourth AND element, the output of which is the output of the absence of the device record, the information 'input of the third ^' register is the input of the recording key of the device, the output of the third register is connected to the second input of the comparison element, the output is ”Which is connected to the second input of the third element AND ,, outputs

Less and More comparison elements are connected to the third inputs of the AND elements of the first and second groups, respectively, with the fact that, for the sake of simplicity, it contains two triggers and a differentiating element, direct and inverse the outputs of the first trigger are connected to the input of the differentiating element and the second input of the fourth AND element, the output of the differentiating element is connected to the second input of the first OR element, the inverse output of the second 15 trigger is the device ready output, the direct output of the second trigger is connected to the second input of the first AND element, the start input of the device is connected to the installation input 2q in 1 of the second · trigger, the output of the first OR element is connected to the reset input 0 of the second trigger, the output of the second AND element is connected to the gate input of the first trigger.