Minggu, 20 Desember 2009

USES OF PREPOSITIONS

0 komentar Diposting oleh Mega di 19.02


Use of prepositions

Inseparable
Prepositions are used in three ways:
(1)   Compounded with verbs, adverbs, or conjunctions; as, for example, with verbs, withdraw, understand, overlook, overtake, overflow, undergo, outstay, outnumber, overrun, overgrow, etc.; with adverbs, thereat, therein, therefrom, thereby, therewith, etc.; with conjunctions, whereat, wherein, whereon, wherethrough, whereupon, etc.

Separable
    (2) Following a verb, and being really a part of the verb. This use needs to be watched closely, to see whether the preposition belongs to the verb or has a separate prepositional function. For example, in the sentences, (a) "He broke a pane from the window," (b) "He broke into the bank," in (a), the verb broke is a predicate, modified by the phrase introduced by from; in (b), the predicate is not broke, modified by into the bank, but broke into—the object, bank.
Study carefully the following prepositions with verbs:—
Considering the space they took up.—Swift.
I loved, laughed at, and pitied him.—Goldsmith.
The sun breaks through the darkest clouds.—Shakespeare.
They will root up the whole ground.—Swift.
A friend prevailed upon one of the interpreters.—Addison
My uncle approved of it.—Franklin.
The robber who broke into them.—Landor.
This period is not obscurely hinted at.—Lamb.
The judge winked at the iniquity of the decision.—Id.
The pupils' voices, conning over their lessons.—Irving.
To help out his maintenance.—Id.
With such pomp is Merry Christmas ushered in.—Longfellow.


 

Simple Future Tense

0 komentar Diposting oleh Mega di 02.57

I will sing

The simple future tense is often called will, because we make the simple future tense with the modal auxiliary will.

How do we make the Simple Future Tense?

The structure of the simple future tense is:

subject
+
auxiliary verb WILL
+
main verb

invariable
base
will
V1




For negative sentences in the simple future tense, we insert not between the auxiliary verb and main verb. For question sentences, we exchange the subject and auxiliary verb. Look at these example sentences with the simple future tense:
subject
auxiliary verb
main verb

+
I
will

open
the door.
+
You
will

finish
before me.
-
She
will
not
be
at school tomorrow.
-
We
will
not
leave
yet.
?
Will
you

arrive
on time?
?
Will
they

want
dinner?

When we use the simple future tense in speaking, we often contract the subject and auxiliary verb:

I will
I'll
you will
you'll
he will
she will
it will
he'll
she'll
it'll
we will
we'll
they will
they'll
For negative sentences in the simple future tense, we contract with won't, like this:

I will not
I won't
you will not
you won't
he will not
she will not
it will not
he won't
she won't
it won't
we will not
we won't
they will not
they won't


 

Rabu, 16 Desember 2009

Subject, Verb, Complement & Modifier

0 komentar Diposting oleh Mega di 22.59

Subject

The subject is the agent of the sentence in the active voice, subject is the person or thing that does the action of the sentence and subject normally precedes the verb.
Note :  Every sentece in English must have a Subject
Example : Coffee is delicious
                Milk contains calcium
The subject may be a noun phrase. A noun phrase is a group of words ending with a noun. (it can't begin with a preposition).
Example : The book is on the table
                That new red car is John's
In some sentence there is not true subject. However it and there can often act as pseudo-subjects and should be considered as subjects.
Example : It is a nice day today
               There was a fire in that bilding last month

Verb
The verb follows the subject, it generally shows the action of the sentence.
Note : Every sentence must have a verb
Example : John drives too fast
                They hate spinach
The verb maybe a verb phrase. A verb phrase consists of one or more auxiliaries and one main verb. The auxiliaries always precede the main verb.
Example : John is going to Miami tomorrow
               (auxiliary is; main verb going)
               Jane has been reading that book
               (auxiliary has, been; main verb reading)

 

Rabu, 11 November 2009

X.25 Protocol

0 komentar Diposting oleh Mega di 14.57

X.25 adalah protocol yang mendefinisikan bagaimana computer (device) pada jaringan public yang berbeda platform bisa saling berkomunikasi. Protocol yang sudah distandarisasi oleh International Telecommunication Union-Telecommunication Standardization Sector (ITU-T).


Gambar 1 mengilustrasikan sebuah network X.25
Gambar 1. Paket Switching dari Jaringan X.25
Sumber: http://www.sangoma.com/x25.htm

Device pada X.25 ini terbagi menjadi tiga kategori:

  • Data Terminal Equipment (DTE),Data Circuit-terminating Equipment (DCE) serta•Packet Switching Exchange (PSE).
  • Device yang digolongkan DTE adalah end-system seperti terminal, PC, host jaringan (user device).
  • Sedang device DCE adalah device komunikasiseperti modem dan switch. Device inilah yang menyediakanbagikomunikasiantara DTE dan PSE. Adapun PSE ialah switch yang yangmenyusunsebagianbesar carrier network.
Hubungan antar ketiga kategori ini diilustrasikan pada gambar di bawah ini :


Gambar 2. Hubungan DTE-DCE dan PSE
Sumber: www.cisco.com



 

Frame Relay

0 komentar Diposting oleh Mega di 03.19


FRAME RELAY SERVICE
FRS merupakan data-only service. Service ini hanya diperuntukkan bursty data traffic, dan tidak menyediakan fasilitas untuk time-sensitive real-time traffic seperti video atau suara. Dua term penting yang perlu diketahui consumer adalah committed information rate (CIR), yaitu jaminan data rata-rata yang dikontrak, dan committed burst size (CBS, juga dinotasikan dengan Bc), jumlah bit maksimum yang dapat ditransfer selama interval waktu T. Relasi antara besaran-besaran tersebut
T = Bc / CIR

Sebagai contoh, CIR 128 kbps dan CBS 512 kilobits, T adalah 512 dibagi 128 yaitu 4 detik. Ini berarti jaringan dijamin untuk transfer data 512 kilobit pada selang waktu 4 detik . Ketika membeli FRS, diperlukan seleksi hati-hati pada harga CIR dan CBS yang menghasilkan harga T cukup besar untuk meng-cover kondisi burst terburuk. Bagaimanapun, faktor lain masuk kepada persamaan di atas, memperbolehkan transfer data melebihi CBS. Faktor tersebut ialah excess burst size (EBS, juga dinotasikan dengan Be). Jika terjadi congestion pada jaringan, consumer dijamin mendapatkan performansi sesuai dengan CIR dan CBS yang dipesan. Jika pada jaringan tidak terjadi congestion, consumer dapat melakukan transfer data hingga Bc + Be bytes per detik. Pada contoh di atas, dengan CBS 512 kbps dan EBS 256 kb, diperbolehkan transfer data 768 kb ketika jaringan tidak congested.


 

Senin, 09 November 2009

Security Jaringan Wireless

0 komentar Diposting oleh Mega di 20.49

  • Jaringan Wireless
Teknologi wireless merupakan peralatan untuk berkomunikasi tanpa koneksi fisik. Pada teknologi wireless ini menggunakan transmisi frekwensi radio sebagai alat untuk mengirimkan datanya.
Jaringan wireless merupakan jaringan tanpa kabel yang menggunakan gelombang radio sebagai media transmisi data. Pengelompokkan jaringan wireless berdasarkan jaringannya ada 3 macam, yaitu : Wireless Wide Area Network (WWAN), WLAN, dan Wireless Personal Area Network (WPAN).

 

APLIKASI VIDEO CONFERENCE DENGAN KEMAMPUAN BEROPERASI PADA IPV4 DAN IPV6

0 komentar Diposting oleh Mega di 20.16

Komunikasi merupakan bagian yang tak dapat dipisahkan dalam kehidupan manusia. Karena berkembangnya teknologi telekomunikasi yang semakin pesat, tersedianya jaringan broadband yang mampu membawa data dalam jumlah besar, dikembangkan bentuk komunikasi yang baru, yaitu koneksi telepon melalui internet (Voice over IP atau VoIP) serta video conference, yang memungkinkan user komputer untuk melakukan pertemuan dari tempat yang berbeda. VoIP memungkinkan user komputer untuk seolah-olah menelepon user yang lain, sementara dengan video conference, user komputer dapat melihat wajah serta mendengarkan suara dari user yang lain, sehingga seolah-olah komunikasi berlangsung secara tatap muka.

 

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