확률적인 시간 제약 조건을 갖는 실시간 시스템을 위한 과실행 제어 및 합성 기법

김강희(Kanghee Kim),황호영(Hoyoung Hwang) 한국정보과학회 2005 정보과학회논문지 : 시스템 및 이론 Vol.32 No.5·6

Soft real-time applications such as multimedia feature highly variable processor requirements and probabilistic guarantees on deadline misses, meaning that each task in the application meets its deadline with a given probability. Thus, for such soft real-time applications, a system designer may want to improve the system utilization by allocating to each task a processor time less than its worst-case requirement, as long as the imposed probabilistic timing constraint is met. In this case, however, we have to address how to schedule jobs of a task that require more than (or, overrun) the allocated processor time to the task. In this paper, to address the overrun problem, we propose an overrun control method, which probabilistically controls the execution of overrunning jobs. The proposed overrun control method probabilistically allows overrunning jobs to complete for better system utilization, and also probabilistically prevents the overrunning jobs from completing so that the required probabilistic timing constraint for each task can be met. In the paper, we show that the proposed method outperforms previous methods proposed in the literature in terms of the overall deadline miss ratio, and that it is possible to synthesize the scheduling parameters of our method so that all tasks can meet the given probabilistic timing constraints. 멀티미디어와 같은 연성 실시간 응용들은 서비스 품질을 위해 각 태스크들이 마감시간 전에 실행을 마칠 수 있다는 확률적 보장을 요구한다. 시스템 설계자는 태스크들의 확률적 시간 제약 조건을 만족시키는 범위내에서 각 태스크에게 최악 처리기 요구량보다는 적은 처리기 시간을 할당함으로써 시스템 이용률 향상을 추구할 수 있다. 그러나 각 태스크에게 주어진 처리기 할당량이 최악 요구량보다 적은 경우에는 필연적으로 할당량을 초과하는 요구량을 가진 태스크 작업들, 즉 과실행 작업들이 발생하게 되므로 과실행 작업에 대한 제어 기법이 필요하다. 본 논문에서는 연성 실시간 시스템에서의 확률적인 과실행 제어 기법 및 합성 기법을 제안한다. 제안하는 기법은 우선순위 스케줄링의 기반 위에서 각 태스크가 주어진 확률적 시간 제약 조건을 만족할 수 있도록 과실행을 억제함과 동시에, 태스크 실행시간의 가변성으로 인한 여분의 처리기 시간을 일부 과실행 태스크에 유연하게 할당함으로써 시스템 이용률을 향상시킬 수 있다. 본 논문에서는 시스템 모델의 제시와 실험 결과의 분석을 통하여 제안하는 과실행 제어 기법이 마감시간 위반율 측면에서 기존의 기법들보다 우수함을 보이며, 또한 임의의 확률적 시간 제약 조건이 주어질 때 이를 만족시키는 과실행 제어 기법의 매개 변수들을 합성할 수 있음을 보인다.

모바일 플랫폼을 위한 네트워크 환경 측정 시스템 설계 및 구현

김강희(Kanghee Kim),여진주(Jinjoo Yeo),김진혁(JinHyuk Kim),최상방(SangBang Choi) 대한전자공학회 2013 전자공학회논문지 Vol.50 No.2

험로 승차감 향상을 위한 HCS 최적화 방안 연구

김강희(KangHee Kim),김종엽(JongYup Kim),최종명(JongMyung Choi),백광덕(KwangDuk Baek) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6

As customers demand for comfort increases, performance tuning technology is gradually developing. This is illustrated by the luxurious specifications of shock absorbers or improved performance through careful tuning. This paper aims to demonstrate a technology that can satisfy customers demands for rough ride comfort and control the body of a vehicle. It is named HCS (Hydraulic Compression Stop) and functions similar to the HRS (Hydraulic Rebound Stopper) as we know it, but HCS has the advantage of being able to tune unlikely HRS. This paper shows how the HCS is structured, what characteristics it exhibits, and how it affects vehicle performance. I will share the evaluation results of sample and vehicles and discuss how to use HCS in the future.

전후륜 양력비에 따른 고속주행 안정성 연구

김강희(KangHee Kim),김우철(WooChul Kim),남성현(SungHyun Nam),전성현(SungHyun Jeon) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5

The Lift acts in the direction corresponding to the vertical direction during the straight running. There is a difference in the high speed stability of the vehicle depending on the lift coefficient (CL). That is, when CL is higher, the high speed stability is more unstable, and when it is lower, stability is more improved. In this paper, I confirmed the correlation between lift coefficient and high speed stability. Also, the lift coefficient is related to the design of the vehicle. If we set the lift coefficient properly, we will be able to develop the vehicle efficiently considering performance and design.

한국어교육을 위한 지역 문화 리터러시 연구

김강희(Kanghee Kim) 한국교양교육학회 2024 교양교육연구 Vol.18 No.1

자이트론 - 자율주행 로봇 개발 기업

김강희(Kanghee Kim),주용수(Yongsoo Joo) 한국정보과학회 2019 정보과학회지 Vol.37 No.9

한국피아노교수법학회논문집 : 베토벤 피아노 소나타 No. 31, Op. 110 Ab Major의 연구

김강희 ( Kanghee Kim ) 한국피아노교수법학회 2007 음악교수법연구 Vol.3 No.-

The great composer Ludwig van Beethoven composed piano sonatas as a pianist. The piano sonata No.31, Op.110 Ab major is the only major work with no dedication. It is the most continuous work of all his piano sonatas. He manipulated tonal areas through this piano sonata No.31, Op.110 Ab major. This sonata is an incredible work of art in the respects of the range of musical style and embracing emotion, the range and expressive effectiveness. The motivic relationships of this sonata are extraordinary. Beethoven compared the texture between fugue and homophony. Beethoven borrowed two Austrian songs such as "Our cat``s had kittens" and "I``m a wretch, you``re a wretch" to the second movement of this sonata. He also used Recitativo in manner of Baroque style with poignant and intense mood. Tempo has changed 7 times and Bebung effect of clavierchord was used. Beethoven alsoborrowed "Es ist volbracht", No. 58 from J. S. Bach`` St. John Passion. The moment of deepest despair and Christ``s final words from the cross are described. In tonic major, the first Fugue is started and climax on V7/I. After the second Arioso, the second Fugue is played in reverse form and ending in a huge affirmation of Ab Major with ff. The tonal areas of whole sonata is Ab major. Beethoven emphasized the Db Major as IV. In the exposition, there is an emphasis on I and IV chords in both key areas. These chords are stressed several times with the third on the top. The notes of Db and D, Fb and F are conflicted in several times to describe the struggling life of human being. The penultimate harmony of the first movement is crucial and represented the clash between F and Fb. The first fugue is seemed the resolution of the tonality. The first fugue was divided into three sub-sections. The second Arioso is shown in the new key of g minor. After the final chord is altered to be G major, the second Fugue has shown in logical manner. Through the tonal ambiguity of tonal area, the harmony is embraced to reenforce the tonic. The motive of the first theme of the first movement is appeared through the whole sonata. The downward motion of third is sequenced several times. The fugue subject is derived from the first theme of the first movement. It omits the opening melody note C. Beethoven wrote this sonata as a drama through the fugue and homophony. The function of the fugue is not only a contrapuntal working out of the subject, but to return to the homophonic texture of the recapitulation of the first movement. After the hopeless first Arioso, the reversed fugue subject has stated. Beethoven manipulated the subject in manner of the augmentation and diminution. Finally, Beethoven glorified the God through the arpeggio of 5 octaves with ff.

헤지 문법 항목으로서의 ‘-고요’, ‘-거든요’, ‘-는데요’ 연구

김강희(Kanghee Kim) 한국중원언어학회 2017 언어학연구 Vol.0 No.44

The purpose of this study is to show that Korean final endings “-goyo”, “-geodunyo”, and “-nundaeyo” have a hedging function, and these endings are frequently used in public hearing discourses. Originally, these final endings are the grammaticalized forms of connective endings “-go”, “-geodun”, and “-nundae”. However, this study did not focus on the grammaticalization process instead this study focused on the discourse function of these final endings as a hedge expression. This study applies Hyland (1996)’s theory. According to the analysis of public hearing corpus data, “-goyo” and “-geodunyo” are mostly used as a content-oriented hedge, while “-nundaeyo” is used as an listener-oriented hedge. In other words, “-goyo” and “-geodunyo” are hedge expressions that are used to protect the truth of the proposition, whereas “-nundaeyo” is a hedge expression that is used to promote interactions with the listeners. The consequence of this study is significant, as it contributes further shaping the hedge expressions in Korean. Further study is needed to build a more sophisticated theoretical framework for the Korean hedge expressions.

우선순위 스케줄링을 사용하는 실시간 시스템을 위한 정확한 확률적 분석 방법

김강희(Kanghee Kim) 한국정보과학회 2004 정보과학회논문지 : 시스템 및 이론 Vol.31 No.3·4

최근 멀티미디어, 신호처리와 같은 실시간 응용들에 대해서 그 응용에 속한 태스크들이 일정한 확률로 마감시간을 만족하는 것을 보장하는, 소위 확률적 보장을 제공하는 것이 점점 더 중요해지고 있다. 확률적 보장을 제공하기 위해서는 주어진 시스템에서 각 태스크의 마감시간 위반확률(deadline miss probability)을 예측할 수 있는 분석 방법이 필요하다. 본 논문에서는 Rate Monotonic 또는 Earliest Deadline First와 같은 우선순위 스케줄링을 사용하는 시스템에서 각 태스크의 마감시간 위반확률을 정확하게 계산하는 분석 방법을 제안한다. 제안하는 분석 방법은 임의의 실행 시간 분포를 갖는 태스크들에 대해서 각각의 응답 시간 분포를 정확하게 계산함으로써 개별 태스크들의 마감시간 위반확률을 결정한다. 본 논문에서는 실험을 통해서 제안하는 분석 방법의 정확성을 검증하였고, 기존의 다른 분석 방법보다 우수함을 보였다. Recently, for real-time applications such as multimedia and signal processing, it becomes increasingly important to provide a probabilistic guarantee that each task in the application meets its deadline with a given probability. To provide the probabilistic guarantee, an analysis method is needed that can accurately predict the deadline miss probability for each task in a given system. This paper proposes a stochastic analysis method for real-time systems that use priority-driven scheduling, such as Rate Monotonic and Earliest Deadline First, in order to accurately compute the deadline miss probability of each task in the system. The proposed method accurately computes the response time distributions for tasks with arbitrary execution time distributions, and thus makes it possible to determine the deadline miss probability of individual tasks. In the paper, through experiments, we show that the proposed method is highly accurate and outperforms exisiting methods proposed in the literature.

한국피아노교수법학회논문집 : 대한민국 피아노 교수법 전공 교과과정 심층연구

김강희 ( Kanghee Kim ) 한국피아노교수법학회 2008 음악교수법연구 Vol.4 No.-

The piano study in the Republic of Korea had been started at the university since March, 1925 at Ewha School (the former Ewha Womans University). The most of piano majors has devoted to teach students privately at the studio or schools. The scholars studied abroad also has taught piano privately. Therefore, a desire for the piano pedagogy program was increased in the Republic of Korea. There are 8 master``s degree programs and 2 doctoral degree programs of piano pedagogy majors in the Republic of Korea from march, 1999. The purpose of this study is to examine those programs in the Republic of Korea and to adapt within the structure of any institution currently offering piano pedagogy. After the review of the American pedagogy curricula of master``s and doctoral degree program through the guideline from the NASM and NCKP handbook, a type of graduate school, a number of students, time for offering classes, admission to graduate study, completion of degree program, credits, curricular structure, general examination, other requirement for the degree completion of pedagogy curricula of the Republic of Korea are analyzed. Since the non-music majors are admitted to the master``s program, preliminary classes in functional keyboard skills, music history and music theory are required and obeyed strictly for the competencies of the master``s degree. More teaching and observation assignments in several ways and full-time faculties are needed. For the doctoral program, more specialized course contents such as research on history of piano pedagogy and discussions on selected readings, business aspects of the independent studio, and so on are needed to develope.