Leo's Garage

Date: 05/26/2025=================Student: Dawoon KimTopic: German Cars Win, US Cars Lose in Japanhttps://engoo.com/app/daily-news/article/german-cars-win-us-cars-lose-in-japan/xMwAXjDPEfCr_Zvj5EA4fASentence Construction:X I'm 11 o'clock. >> It’s 11 o'clock here. X I had 2 meeting. >> I had 2 meetings.X I went to Austria by a car. It takes 8 hours by a car. >> I went to Austria by car. It takes 8..

느낀점 Problem Statement무엇이 문제인가? 멀티프로세서 실시간 시스템에서 fully-partitioned fixed-priority scheduling(FP-FPS) 하에서 공유 자원을 사용할 때, 기존의 spin-based 프로토콜은 다음과 같은 한계를 가진다. 고정된 spin priority policy -> 모든 Job에 일률적인 정책 강제 긴 Resource Request 또는 긴 Critical Section에 대해 비효율적Blocking Time에 대해 과도하게 보수적인 분석 -> System Schedulability 저하Non-predictable Priority Inversion 발생 가능 해결해야 할 핵심 문제:Shared Resource 접근 시 다양한 상황에 대응 가능한..

Date: 05/20/2025=================Student: Dawoon KimTopic: A ‘rogue employee’ was behind Grok’s unprompted ‘white genocide’ mentionshttps://edition.cnn.com/2025/05/16/business/a-rogue-employee-was-behind-groks-unprompted-white-genocide-mentionsSentence Construction:X One month later, summer vacation start. I can go Korea one month. >> Summer vacation starts in one month. I can go to Korea for a ..

Date: 05/19/2025=================Student: Dawoon KimTopic: Jeju's Women Divers May Have Evolved for Divinghttps://engoo.com/app/daily-news/article/jejus-women-divers-may-have-evolved-for-diving/zH0NtC9BEfC_RAuQDHG-ZgSentence Construction:X It is first time to see in person. >> It is the first time to see him in person.X I think I slept only 2 hours. >> I think I only slept for 2 hours.X Tomorrow..

Date: 05/16/2025=================Student: Dawoon KimTopic: Donald Trump may reopen Alcatraz as a prisonhttps://breakingnewsenglish.com/2505/250508-alcatraz-prison.htmlSentence Construction:X In Germany is more expensive more than 5x in Korea. >> In Germany, it's more than five times more expensive than in Korea.X Before travelling, accommodation is one of the really important part for great trip..

Date: 05/14/2025=================Student: Dawoon KimTopic: FREE TALKING - RestaurantSentence Construction:X Sometimes, it can above 30 degrees sometimes. >> Sometimes, it can go above 30 degrees.X The temperature is really up and down. >> The temperature is really unpredictable.X It was really hard taking a car before. >> It was really hard to take a car before.X Previous owner throw her away. ..

Date: 05/13/2025=================Student: Dawoon KimTopic: FREE TALKING - PetsSentence Construction:X This test lab is out of the city. >> This test is held outside the city.X I should check my research product. Is it good? >> I should check my research project.X Another day is 10 degrees Celcius. >> On another day, the temperature was 10 degrees Celsius.X She can wait for eating. >> She can wai..

Date: 05/12/2025=================Student: Dawoon KimTopic: 'Never Argue,' Says World's Oldest Person, 115https://engoo.com/app/daily-news/article/never-argue-says-worlds-oldest-person-115/5jKjtCl4EfCHWSujNGePHgSentence Construction:X My professor want to attend.. >> My professor wants to attend.X Some of my company colleagues come to Germany on this Wednesday. >> Some of my colleagues from the ..

느낀점 Key Contribution기존의 2개의 EDF(Early Deadline First) 기반 Test인 GFB(Goossens, Funk, Baruah) 및 BAK(Baker) Test를 비교GFB와 BAK는 상호 보완적이며, 어느 하나가 항상 더 우수한 것이 아님을 증명 새로운 스케줄러 Test 제안 (BCL - Bertogna, Cirinei, Lipari, 저자들의 이름이다)특히 heavy task(과도한 계산량을 요구하는 작업)를 포함한 경우, 기존 GFB 및 BAK 테스트보다 더 많은 Task Set을 스케줄할 수 있음을 증명이 Test는 총 간섭(interference) 개념을 기반으로 하며, Test 계산식이 더욱 타이트하게 조정되었다.광범위한 실험을 통해서 효과 검증다양한 조건(..

Real Time System을 공부하다보면, Scheduler라는 걸 학습하게 된다.이것은 왜 필요하게 되었을까? 자원은 한정되어 있고, 요청은 많아지기 때문에CPU, Memory, Bus 등 시스템 자원은 유한하다. 동시에 여러 작업이 실행을 요구하는 상황에서, "누가 먼저, 얼마나 오래 실행되는가?"를 정할 필요가 있다.이것이 바로 Scheduling 문제의 본질이다. Scheduler 진화 배경시대시스템 구조스케줄링 필요성해결책1950s단일 프로세스없음 (순차적 실행)수동 제어1960sMultiprogramming 등장CPU idle 줄이기 위해 Task 전환 필요Round Robin, FCFS 등1970sReal-Time OS 등장Task마다 데드라인 생김Rate Monotonic, EDF20..