Three ways of automatic feedback and resendIn the satellite ATM network, the three automatic feedback retransmissions were the selective repeat protocol (SARQ), forward error control (FEC), and multi-station automatic feedback retransmissions.
When dealing with the error frames in the sliding window protocol, all the correct frames after the bad frame are stored, and the sender only resends the damaged frames. Its advantage was that it only retransmitted the wrong frame, which could save the satellite link's band width and had high efficiency. Its disadvantage was that it was more complicated to implement and sensitive to memory. In the case of a high error rate, it needed to occupy a large amount of memory to store the subsequent correct frame. Due to the retransmissions, the delay would increase and change, so it was not suitable for constant bit rate (Cbr) services.
Forward error control (FEC) refers to the error control method that can automatically correct a certain degree of transmission error according to the principle of coding at the transmitting end. In the satellite ATM network, the FEC mechanism can be applied to the physical layer, AAL layer, and higher layers. the FEC applied to the physical layer cannot correct cell loss, while the FEC applied to the higher layer cannot correct errors.
The reference materials did not provide more information about the automatic feedback and replay of multi-station.
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There are happy dreams in the lyrics. What song is it?There were many songs that contained the words " happy dreams " in their lyrics. For example, there was a song with lyrics such as " Every one of us came to this world and learned to grow up under the sky. Do you still remember the dreams of our youth? Like flowers emitting a faint fragrance, youth is the most beautiful wing of dreams. We set sail in the rainy season of 17 years old. After many setbacks and hardships, we finally arrived at the place where life matures. The dream of happiness is ahead. We can see the sun through the dark night." There was also a song with lyrics such as " Sigh, do you still remember that time? You were so silly back then. You wore red flowers on your chest, and my face was shy. I asked you what you would use to marry me. You said that I had hardworking hands and a sincere heart. Man: Sigh, how could I forget? It was so lively back then. The red happy words were pasted all over the house. Your face was like spring flowers. I said that you belonged to me from now on. You said that I would create a warm home with you. I love you, I love you, we have a beautiful fairy tale, I love you, I love you, from now on, the password to happiness is unlocked. Man: Sigh, the spring breeze blows, the weather is new, the sun shines on the land of China, you dance and smile, I sing so freely, everyone is heading for a well-off life, heroic, the road of sunshine, walking beautifully, woman: Ai, the door is open, the world is wide, happy dreams are not fairy tales, the beautiful scenery of my hometown is like a picture, the villagers are singing and smiling, I live and work in peace and contentment, I have a warm home, and my happy dream has come true."
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The lesson plan and reflection of the seventh unit of the first grade Chinese bookThe following is a lesson plan for Unit 7 of the first grade Chinese language book and an example of reflection:
** 1. Teaching objectives **
1. Students were asked to discover the characteristics of things through observation, description, analysis, comparison, and so on.
2. Through reading aloud, imitating, performing, and other means to improve the students 'language ability.
** 2. Important and Difficult Points in Teaching **
1. ** Main point **
- Cultivate the students 'ability to observe and describe the characteristics of things.
- To improve the students 'language skills, such as reading aloud, imitating, etc.
2. ** Difficulty **
- Guide the students to understand the content of the text and express their understanding accurately.
** 3. Teaching process **
#(I) Introduction
1. The teacher used the method of "enlightening questions" to prepare a few pictures related to the content of the text and display them on the screen. For example, for the content "Little Tadpoles Looking for Their Mommy", it could show pictures of the little tadpoles at different stages of growth. Ask the students to imagine the scene in the text and let them guess the plot of the story, such as how the little tadpole found its mother. This will arouse the students 'interest and thoughts, stimulate the students' inner motivation to learn, and thus better participate in the teaching activities.
#(II) Class interaction
1. ** Q & A coordination **
- The teacher used the questions in the text to answer and interact. For example, in the case of "Little Tadpoles Looking for Their Mommy," one could ask,"Why aren't little tadpoles afraid of danger?" "How did the little tadpoles find their mother?" What did the little tadpole learn before it found its mother?" Students were encouraged to actively answer questions, so as to stimulate students 'interest in learning and cultivate students' independent discovery and thinking ability.
2. ** Teamwork **
- The teacher divided the students into groups and distributed different group task cards. There were the following types of tasks:
- Draw a picture according to the content of the text. For example, draw the process of a tadpole looking for its mother.
- Group Imitation: Students imitate the characters in the text, such as the actions and dialogue of the little tadpole, mother frog, etc.
- Group idiom solitaire (if it is related to the unit content or as an extension exercise): use idioms related to animals or words in the text to solitaire.
- Read the text in groups: The members of the group read the text to each other, correct the pronunciation, and improve the fluency and emotional expression of the reading.
- Make up a story in small groups: According to the content of the text or the theme of the text, let the students make up a story related to it. For example, make up other interesting stories about a tadpole looking for its mother.
#(III) Summing Up
1. The teacher used the method of "combing" and "reflecting". For example, for the text "Little Tadpoles Looking for Mommy," he could list the skills that the little tadpoles had learned and summarize the little tadpoles 'learning experience.
2. After class, he arranged homework and drew a picture of a tadpole finding its mother.
** 4. Reflection on Teaching **
1. ** Lacking the real situation **
- In the teaching process, although many teaching methods such as question and answer, group cooperation, etc. were used, the overall teaching lacked the creation of real situations. This made it difficult for students to apply what they had learned in real situations and achieve the best teaching effect. In future teaching, more attention should be paid to creating real situations that are closely related to the content of the text, so that students can better understand and apply knowledge.
2. ** Not enough attention to individual differences **
- In the classroom interaction segment, the individual differences of the students might not have been fully taken into account. Some students may be active in group activities, but others may be less involved. In the future, he would pay more attention to the learning ability and participation of different students, and give more personal guidance and encouragement to ensure that every student could gain something in the classroom.
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repeatedly waking up with a broken mindNervous weakness could lead to sleep disturbances, including repeated awakenings. Patients with neurosis often had difficulty falling asleep, had shallow sleep, had many dreams, and were easily woken up, and it was difficult to fall asleep again after waking up. This was because the nervous system's normal function was affected, making it difficult for the brain to maintain a deep state of relaxation during sleep.
At the same time, patients with neurosis may also be accompanied by other symptoms, such as extreme fatigue, lack of interest in anything, poor memory, slow response, and mood swings.(For example, nervousness, anger, and random thoughts), affecting digestive function (such as loss of appetite, indigestion, constipation, diarrhea, etc.), muscle tension pain (such as tension headache, muscle soreness, dizziness, etc.), and even physiological obstacles such as ringing in the ears, palpitation, and short of breath. In serious cases, it may develop into mental illnesses such as anxiety and depression.
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How to choose jadeiteThe selection of jadeite and jade articles could be started from the following aspects:
1. ** Species **: The "species" of jadeite referred to the texture, which was affected by the crystal particles. The smaller the particles, the better the texture, and the higher the value of the jadeite.
2. Water: You can use a spotlight flashlight to observe the surface of the jade. The light transmission is about 3.3mm, 6.6mm, and 10mm. Generally, jade with a water content of 2 cm was very transparent, jade with a water content of 1 cm was semi-transparent, and jade with a water content of less than 1 mm was considered to be in a poor and dry state. The better the water content, the higher the market value.
3. ** Base **: It refers to the degree of floc, black spots, and other colors of the jade. Some jadeites had a high degree of clarity but were not expensive. It was the "bottom" that worked.
4. ** Color **: It wasn't that the darker the color, the better, but the brighter the better. It was better to be light and bright than dark. The value of the green parts that were evenly distributed was higher. The value of the transparent and bright colors that were evenly distributed might be worth millions, such as the glass type of imperial green jade.
5. ** Work **: The jade carving is not obvious in the comparison of the value of the plain jade, but it is very important in the flower. There were embossed, round carvings, hollowed-out carvings, and so on. No matter which one, it had to be "clever, beautiful, and exquisite." The exquisite craftsmanship and exquisite design were the best jade works.
6. ** size, thickness **: A large piece of jade is valuable, but it must be large in a scientific and aesthetic way. Thick and round, with a balanced ratio, the price would be higher.
7. ** Price/performance ratio and compatibility **: Jade of the same grade and quality with a discount is jade with a high price/performance ratio; jade with a theme, style, and quality that meets one's needs and the price is within one's budget is jade that suits one. The quality of the jade mainly depended on the type, water, color, and base of the jade (it was difficult to explain it in a simple way), as well as the precision of the carving process.
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Prolonged war, how to say and how to write it in EnglishThe English words for " protracted war " were " a protracted struggle,"" Protracted war,"" Outlive," and " Protracted warfare."
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Dog Luck War God Encyclopedia"Lucky Dog God of War" told the story of a 21st century young man named Jin Tian who was reborn into a German Major General Ge Siyun when the German army was defeated by the Soviet Union in World War II. He led the defeated soldiers to turn defeat into victory and won the Battle of Stalingrid. In the end, he became a marshal with outstanding military achievements, and then became the head of Germany. He defeated the Soviet Union, defeated the allied forces, and married many beautiful women, becoming the Prince of Europe. This was a humorous and classic novel. The protagonist, Jin Tian, was 20 years old. He was not tall and handsome. The novel had humorous descriptions of his birth scene, such as the sun shining in the sky at home (Grandma burned firewood), the rooster crowing everywhere (killing chickens next door), etc.
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