Multi-Level Policy Model Access Control Security Operating Systems of the Windows Family

The purpose of research – development of a more advanced Windows NT family access control mechanism to protect against information leakage from memory by hidden channels. The method of research – analysis of Windows NT family models of mandatory access control and integrity control, modeling of access control security policy for specified security properties, automatic verification of models. The Lamport Temporal Logic of Actions (TLA +) used to describe the model and its specification is used. TLA+ allows automatic verification of the model with the specified security properties. The result of research – revealed the main limitations of the existing mandatory integrity control of operating systems of the Windows NT family. A set of structures of a multilevel model has been developed, reflecting the attributes that are significant for modeling the process of access of subjects to objects. The key mechanisms of access control in the operating system are modeled: management of users, groups, subjects, objects, roles, rights, discretionary and mandatory access control, mandatory integrity control - multilevel control of subjects’ access to objects. The model defines a mechanism for controlling the creation of subjects based on executable files to organize an isolated software environment. The values of the attributes of the model variables for the initialization stage are determined. The invariants of variables correctness in the process of verification and subjects to objects safe access are developed. The model was specified using the TLA + modeling language and verified.

jaringan komputer 3 DHCP Server Linux Dedi Satria 175100009

DHCP server merupakan sebuah mesin yang menjalankan layanan yang dapat "menyewakan" alamat IP dan informasi TCP/IP lainnya kepada semua klien yang memintanya. Beberapa sistem operasi jaringan seperti Windows NT Server, Windows 2000 Server, Windows Server 2003, atau GNU/Linux memiliki layanan seperti ini.DHCP client merupakan mesin klien yang menjalankan perangkat lunak klien DHCP yang memungkinkan mereka untuk dapat berkomunikasi dengan DHCP Server. Sebagian besar sistem operasi klien jaringan (Windows NT Workstation, Windows 2000 Professional, Windows XP,Windows Vista, atau GNU/Linux)DHCP (Dynamic Configuration Protocol) adalah layanan yang secara otomatis memberikan nomor IP kepada komputer yang memintanya. Komputer yang memberikan nomor IP disebut sebagai DHCP server, sedangkan komputer yang meminta nomor IP disebut sebagai DHCP Client.Dalam praktek kerjanya menggunakan dua operasi sistem yaitu LINUX dan Windows.Linux sebagai server dan Windows sebagai Client.Dalam Konfigurasinya menggunakan dua metode yaitu Random dan Fixed.DHCP merupakan protocol yang dipakai untuk pengalokasian alamat IP dalam satu jaringan atau lebih.Kata Kunci : DHCP Server Linux.

Jaringan Komputer 3 Konfigurasi DHCP Server Akhmad Syarifudin 175100012

DHCP (Dynamic Host Configuration Protocol) adalah protokol yang berbasis arsitektur client/server yang dipakai untuk memudahkan penempatan alamat IP dalam satu jaringan. Sebuah jaringan lokal yang tidak menggunakan DHCP harus memberikan alamat IP kepada semua komputer secara manual.DHCP Server merupakan sebuah mesin yang menjalankan layanan yang dapat “menyewakan” alamat IP dan informasi TCP/IP lainnya kepada semua client yang memintanya. Beberapa sistem operasi jaringan seperti Windows NT Server, Windows 2000 Server, Windows Server 2003, dan atau GNU/Linux.Dan DHCP (Dynamic Configuration Protocol) adalah merupakan layanan yang secara otomatis memeberikan alamat IP kepada komputer yang meminta nya, komputer yang memberikan alamat IP disebut sebagai DHCP server, sedangkan komputer yang meminta alamat IP disebut sebagai DHCP client.Kata Kunci : Konfigurasi DHCP Server.

EFFECT OF SUCROSE AND MEDIA STRENGTH ON IN VITRO MULTIPLICATION IN SWERTIA CHIRATA BUCH.-HAM EX WALL: AN ENDANGERED MEDICINAL HERB

Objective: The present study was performed to investigate the role of varying concentrations of carbohydrate source and strengths of nutrient medium in growth and development of in vitro shoots of Swertia chirata-an endangered medicinal plant.Methods: MS medium supplemented with 6-Benzylaminopurine (4.44 µM), Indole-3 acetic acid (2.85 µM) and Adenine sulphate (271.45 µM) was used to test the efficiency of of sucrose at concentrations of 1-5% and of media strength varying from full to one-fourth. The data were analysed using analysis of variance (ANOVA) of Completely Randomized Design (CRD) in GenStat 5 Edition 3.2 for PC/Windows NT (Copyright 1995, Lawes Agricultural Trust (Rothamsted Experimental Station))Results: Observations on axillary shoot multiplication indicated that sucrose at a concentration of 3% and MS medium in its full strength proved to be most optimal for in vitro culture multiplication. On this medium combination mean number of 11.80 shoots (after 4 w) and 18.50 shoots (after 8 w) could be obtained On sucrose free medium the shoots exhibited necrosis while at lower concentrations of 1-2% sucrose, the shoots developed were thin and unsuitable for further growth in vitro. At higher levels of sucrose in the medium, the shoots became thick and stunted. Similarly, reduction in medium strength resulted in a decline in shoot number and shoot length to an average of 6.50 shoots (1.33 cm mean length) on half strength medium and 5.60 shoots (0.88 cm mean length) on one-fourth strength; as observed after 4 w.Conclusion: The experimental findings suggest that any decline from the standard had a significant effect on the number, size and overall health of shoots developed in vitro. The conditions so standardized augment the production of healthy shoots that shall aid in subsequent rooting and survival after transplantation of tissue-culture raised plantlets.

Mixed-mode Operating System for Real-time Performance

The purpose of the mixed-mode system research is to handle devices with the accuracy of real-time systems and at the same time, having all the benefits and facilities of a matured Graphic User Interface (GUI) operating system which is typically nonreal-time. This mixed-mode operating system comprising of a real-time portion and a non-real-time portion was studied and implemented to identify the feasibilities and performances in practical applications (in the context of scheduled the real-time events). In this research an i8751 microcontroller-based hardware was used to measure the performance of the system in real-time-only as well as non-real-time-only configurations. The real-time portion is an 486DX-40 IBM PC system running under DOS-based realtime kernel and the non-real-time portion is a Pentium III based system running under Windows NT. It was found that mixed-mode systems performed as good as a typical realtime system and in fact, gave many additional benefits such as simplified/modular programming and load tolerance.

Mixed - mode Operating System for Real - time Performance

The purpose of the mixed-mode system research is to handle devices with the accuracy of real-time systems and at the same time, having all the benefits and facilities of a matured Graphic User Interface(GUI)operating system which is typicallynon-real-time. This mixed-mode operating system comprising of a real-time portion and a non-real-time portion was studied and implemented to identify the feasibilities and performances in practical applications (in the context of scheduled the real-time events). In this research an i8751 microcontroller-based hardware was used to measure the performance of the system in real-time-only as well as non-real-time-only configurations. The real-time portion is an 486DX-40 IBM PC system running under DOS-based real-time kernel and the non-real-time portion is a Pentium IIIbased system running under Windows NT. It was found that mixed-mode systems performed as good as a typical real-time system and in fact, gave many additional benefits such as simplified/modular programming and load tolerance.