6/05/2012

What is an Operating System?

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Operating System

a program that acts as an intermediate between a user and the computer hardware

controls all computers resource (memory, harddisk(s), ...)

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create a base for user level application so that user-level programmer dont have to worry about the hardware facility, e.g. in using printf.

Components inside Operating System

(Four Basic Components)

Process Management (Scheduler)

Creation and deletion of both user and system processes

Scheduling of the processes

Keep track the status of the processes

Provide channel for interprocess communication

Memory Management

Memory allocation and deallocation

Program memory space protection

Paging

Swapping

Virtual Memory

File System

Disk space management

Maintain directory structure

Enforce security

Control read and write access

Device Drivers, I/O

User Level vs. System Level

When a user-level program wants to get kernel services, it will issues a system call. (kernel call or supervisor call)

Next, the instruction will switch the process from user level to kernel level. (system level)

Here, the operating system will take over the control flow.

After examining the parameter given to the system call, the system call will be run.

Finally, the control is passed back to the user-level program and i.e. from kernel mode back to user level

You may look at /usr/src/linux/include/asm/unistd.h to see the listings of system calls

What is Kernel? Monolithic vs microkernel?

Generally, the operating system, as a running program, is called the kernel and have the four basic components as shown above.

A trend in modern OS is to implement more function in user level and leave a minimal kernel. (microkernel)

In Linux, all the components are kept inside kernel and so, it is not a microkernel structure. However, it is now moving to modules hierarchy, e.g. fs, mm, ...



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Do We Need Summer Holidays

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“Do We Need Summer Holidays?”

Summer holidays are very crucial and we should really think hard about the idea of shrinking or getting rid of it. Due to the summer vacations, the kids can relax, experience pleasure time, perform their favourite activities and put the fast pace of life during the school days behind them. We have to understand that there are many consequences by not having a summer vacation. First of all, the summer holidays have an effect to the student’s growth and development. It helps them to understand the family relationships because they can spend more time with them. The summer break basically provides them with learning and enhancement of experiences. In addition many of us tend to believe that due to long summer vacations students could not properly remember the knowledge learned previously. However, the fact is that student will forget the information whether they are out of school for two months or only three weeks. We should be aware of that not a single kid in this world studies during their summer holidays. Moreover, by cutting down summer vacations we can also damage the summer programs such as youth camps. Last but not least, as a result of the short summer vacation, students would not have enough time for summer employment which is extremely significant for high school students to save the money for their university education. In conclusion, the above points demonstrates that the summer holidays offer to the students with different learning and development opportunities, helps them to understand the family relationships and keeps up with their summer employment.





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australias vanishing frogs

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Stories‘Australia’s Vanishing Frogs’- Earthwatch Essay 1The Earthwatch Institute’s Student Challenge Program ‘Australia’s Vanishing Frogs’ - Diana TungJanuary 4-10 00,Watagan Mountains, NSW. The Earthwatch Institute is a global organization dedicated to promoting environmental awareness amongst scientists, students and educators alike, providing opportunities for the wider community to participate in hands-on activities whilst aiding projects in sustainability and conservation. I was fortunate enough to be selected to participate in Earthwatch’s Student Challenge Program, where I was to spend a week of my summer holidays with a research scientist and 7 other students of different locations and backgrounds surveying the creeks of the Watagan Mountains in NSW. The project, entitled ‘Australia’s Vanishing Frogs’, was an in-depth look at the worsening situation of the Stuttering Frog, the Mixophyes Balbus. After taking an 11-hour train trip to meet up with other team members in Sydney, we spent the rest of the afternoon acquainting ourselves on another train, this time to Newcastle, where upon our arrival we met Michael Mahony, a research scientist from the University of Newcastle, and his three PhD students. We were able to visit our ‘transect site’ in daylight (which we would visit again that night), before spending what was left of the first day setting up camp and waiting for dusk to fall. With an ever darkening sky, we geared up with headlights, numerous layers of clothing and mozzie repellent before making our way to the transect of Boarding House Dam, where we would find our first frogs. Throughout the night we were taught how to imitate frog calls, as well as how to catch and handle them, and even how to determine their sex, with the different methods of capture emphasizing heavily on teamwork. Working from one side of the creek’s bank to another, torches were used to find dull, pinkish eyeshine, the reflection from the frogs’ eyes. However, the frustration of being unable to differentiate frog eyeshine from the bright green sparkles of spiders’ persisted until the next few days, as did the initial clumsiness in performing ‘triangulation’. Used to find responsive but well camouflaged frogs, groups of three would assembled from different angles, turn off their headlights and then highlight athe frog responded to a call.

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6/02/2012

Acting with stage fright

If you order your custom term paper from our custom writing service you will receive a perfectly written assignment on Acting with stage fright. What we need from you is to provide us with your detailed paper instructions for our experienced writers to follow all of your specific writing requirements. Specify your order details, state the exact number of pages required and our custom writing professionals will deliver the best quality Acting with stage fright paper right on time.

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The first time I was onstage, I had terrible stage fright. It was a high school production, and even though I didnt have a leading role, I had a pretty big part. I was in about 6 scenes, and had a decent amount of lines. Up until the night of the play, I had told myself that I wasnt going to be scared, that I didnt have stage fright. Opening night, it all changed.

We stood backstage, in costume and makeup, and I dared to peak from the side of the stage out at the huge auditorium. It was packed. My heart almost leaped into my throat. I automatically forgot all my lines, all the blocking, and all the choreography. We went out into the hallway where my director had organized a prayer circle. As has I have experienced, prayer circles always end up in tears, which end up in the makeup people frantically running around reapllying mascara and foundation.

The prayer circle was a huge sorce of inspiration for me. All the actors and tech crew gathered together to pray and give last minute speeches/encouragment. I happened to be standing next to my best friend. She was such a sorce of encouragment. Her hug got me throught the show. It was all a blur, but it happened, and we all did great.

Ive learned that stage fright can be cured by trust, practice, and a hug from a friend.

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We stood backstage, in costume and makeup, and I dared to peak from the side of the stage out at the huge auditorium. It was packed. My heart almost leaped into my throat. I automatically forgot all my lines, all the blocking, and all the choreography. We went out into the hallway where my director had organized a prayer circle. As has I have experienced, prayer circles always end up in tears, which end up in the makeup people frantically running around reapllying mascara and foundation.

The prayer circle was a huge sorce of inspiration for me. All the actors and tech crew gathered together to pray and give last minute speeches/encouragment. I happened to be standing next to my best friend. She was such a sorce of encouragment. Her hug got me throught the show. It was all a blur, but it happened, and we all did great.

Ive learned that stage fright can be cured by trust, practice, and a hug from a friend.

We stood backstage, in costume and makeup, and I dared to peak from the side of the stage out at the huge auditorium. It was packed. My heart almost leaped into my throat. I automatically forgot all my lines, all the blocking, and all the choreography. We went out into the hallway where my director had organized a prayer circle. As has I have experienced, prayer circles always end up in tears, which end up in the makeup people frantically running around reapllying mascara and foundation.

The prayer circle was a huge sorce of inspiration for me. All the actors and tech crew gathered together to pray and give last minute speeches/encouragment. I happened to be standing next to my best friend. She was such a sorce of encouragment. Her hug got me throught the show. It was all a blur, but it happened, and we all did great.

Ive learned that stage fright can be cured by trust, practice, and a hug from a friend.

We stood backstage, in costume and makeup, and I dared to peak from the side of the stage out at the huge auditorium. It was packed. My heart almost leaped into my throat. I automatically forgot all my lines, all the blocking, and all the choreography. We went out into the hallway where my director had organized a prayer circle. As has I have experienced, prayer circles always end up in tears, which end up in the makeup people frantically running around reapllying mascara and foundation.

The prayer circle was a huge sorce of inspiration for me. All the actors and tech crew gathered together to pray and give last minute speeches/encouragment. I happened to be standing next to my best friend. She was such a sorce of encouragment. Her hug got me throught the show. It was all a blur, but it happened, and we all did great.

Ive learned that stage fright can be cured by trust, practice, and a hug from a friend.

Please note that this sample paper on Acting with stage fright is for your review only. In order to eliminate any of the plagiarism issues, it is highly recommended that you do not use it for you own writing purposes. In case you experience difficulties with writing a well structured and accurately composed paper on Acting with stage fright, we are here to assist you. Your cheap custom college paper on Acting with stage fright will be written from scratch, so you do not have to worry about its originality.

Order your authentic assignment from Live Paper Help and you will be amazed at how easy it is to complete a quality custom paper within the shortest time possible!



 
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