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Extended Context Free Grammar를 위한 ELALR(k) 파서 구성
최준식(Choi Jun-Sik),최광무(Choe Kwang-Moo) 한국정보과학회 1988 한국정보과학회 학술발표논문집 Vol.15 No.2
ECFG(Extended Context Free grammar)에 대한 파서를 만들기 위하여 Nakata[6]는 프로덕션 우변이 deterministic finite automaton일 경우에 대한 ELALR(1) 파서를 정의하였다. 그러나 이 논문에서는 ECFG의 프로덕션 우변이 nondeterministic finite automaton인 일반적인 경우에 대하여 ELALR(k)를 정의하여 ECFG의 표현력과 그리고 파싱이 가능한 문법의 범위를 넓혔으며, ECFG에 대한 파서를 만들기 위해 ELALR(k) lookahead 집합을 구하는 효율적이고 빠른 방법을 제안하며, 이러한 방법을 KPGS(KAIST parser generating system)에 구현하였다.
소아에서 계절성 인플루엔자의 신경학적 또는 신경근육 합병증
최준식(Jun Sik Choi),김효정(Hyo Jeong Kim) 대한소아신경학회 2016 대한소아신경학회지 Vol.24 No.4
목적: 인플루엔자는 호흡기 증상을 일으키는 흔한 원인이지만 드물게 심각한 신경학적 증상 또한 일으키는 것으로 알려져 있다. 본 연구에서는 2013년 계절성 인플루엔자 유행기간 동안 인플루엔자의 신경학적 합병증을 보인 소아 환자들에 대해서 기술하고 계절성 인플루엔자의 신경학적 합병증은 대부분 양성 경과를 보이는지에 대해서 알아보고자 하였다. 방법: 2013년 12월부터 2014년 3월까지 건양대학교병원을 내원한 소아 환자 중 인플루엔자 진단이 된 환자들을 대상으로 의무 기록 조회를 통한 후향적 연구를 진행하였다. 결과: 인플루엔자로 확인된 총 279명의 환자 중 17명(6.1%)에서 신경학적 합병증을 보였다. 열성경련 8명, 뇌전증 악화로 인한 뇌전증 중첩증 1명, 근육염 6명, 인플루엔자 관련 뇌염 1명, 시신경염 1명이었다. 대부분 경과가 양호하였지만 뇌염의 경우 안 좋은 경과를 보였다. 결론: 계절성 인플루엔자 감염에서 다양한 신경학적 합병증이 주로 어린 소아에서 나타났다. 인플루엔자 유행기간에는 다양한 신경학적 증상을 나타나는 환자의 진단에 있어서 인플루엔자의 가능성을 의심할 필요가 있겠다. Purpose: Influenza is generally known cause of acute respiratory disease. It is also cause of neurologic complications and has seldom non-benign nature. We report our cases of neurologic complications with influenza infection among children in 2013 seasonal endemic, and debate on benign nature of seasonal influenza. Methods: We retrospectively reviewed the medical records of all children who were confirmed influenza infection at the Konyang University Hospital, between December 2013 and March 2014. Results: A total of 279 children had influenza infections and 17 (6.1%) presented with neurologic complications. Eight patients manifested febrile seizures, one presented status epilepticus due to with aggravation of epilepsy, and seven presented with myositis. Influenza-associated encephalitis and optic neuritis were observed in each one patient. Most patients showed mild and benign progress, however the patient with influenza-associated encephalitis suffered severe complications. Conclusion: Children with seasonal influenza infections presented a wide spectrum of neurologic manifestations usually in young children. We recommend to suspect the possibility of influenza infection in the diagnosis of children manifesting neurologic symptoms during influenza epidemics.
250km/h급 강체전차선로 시스템 개발을 위한 브래킷 및 완충장치 특성 고찰
최준식(Jun-Sik Choi),김낙경(Nak-Kyung Kim),박혜민(Hye-Min Park) 한국조명·전기설비학회 2018 조명·전기설비학회논문지 Vol.32 No.7
The GTX(Great Train Express) construction project currently underway is being pursued as a national R & D project by the Ministry of Land, Transport and Maritime Affairs. In this study, the development of the 250km/h class of rigid Conductor system has resulted in the reduction of the tunnel cross - sectional area compared to the conventional catenary type, which reduces the cost of the tunnel construction. However, The strong pantograph abilities and the vibration and tipping points of the trains that appear when the train is accelerating in the board must be solved absolutely by adjusting the buffer so that the train can speed up and reduce the arc. In order to improve this, we developed a bracket and developed a shock absorber by FEM structure analysis of bracket material and shape so as to adjust vibration and diameter. The developed product was subjected to tests other than fatigue (dynamic) test and rigidity test, and passed the certification test by satisfying the international standard value of pantotap contact test from the test bed (train line) to the train acceleration test. In the future, our technology has been secured for GTX(Great Train Express / etropolitan area express railway) line system.
확장된 문맥 자유 문법을 위한 효율적인 ELALR(k) 파서생성
최준식(Jun Sik Choi),박우전(Woo Jun Park),최광무(Kwang-Moo Choe) 한국정보과학회 1990 정보과학회논문지 Vol.17 No.5
Extended context-free grammar는 context-free grammar의 생성규칙의 우변에 regular expression을 허용한 것이다. ECFG는 CFG보다 프로그래밍언어의 구문을 보다 간결하고 알기 쉽게 기술할 수 있다. ECFG의 구문분석을 위해 Nakata와 Sassa[15]는 Extended LALR parser의 구성방법을 발표한 바 있으나, 그 방법은 생성규칙의 우변을 deterministic finite automata로 가정했었다. 이 논문에서는 생성규칙의 우변을 nondeterministic finite automata로 표현가능한 개선된 Extended LALR parser 구성법을 제안한다. 또한 ELALR lookahead 집합의 효율적인 계산방법을 제시하며, 새로운 방법들에 의한 ELALR parser generator의 구현 및 실험 결과에 대해 논한다. Extended context-free grammar is more powerful representation than the context-free grammar, which has finite automata, regular expressions, or syntax diagrams as a righthand side of productions. ECFGs describe the syntax of programming languages more concisely and more understandably than CFGs can do. A method for building Extended LALR parsers for ECFGs was given by Nakata and Sassa[15], but they assumed that the righthand sides of productions are deterministic finite automata. In this paper, an improved ELALR parser construction method for ECFGs, which allows the righthand sides of productions to be nondeterministic finite automata, is suggested. Our method is more preferable because NFA is more natural form for ECFGs than DFA. Also, an efficient algorithm to compute ELALR lookahead sets is proposed. An ELALR parser generator based on the proposed new methods is implemented and experimental results are presented.
양중식,최준식,김민,Yang, Joong-Sik,Choi, Jun-Sik,Kim, Min 한국섬유공학회 2001 한국섬유공학회지 Vol.38 No.12
It is well known that the fibers and the slivers to be assembled into roving or yarn need to meet certain criteria in terms of cohesion and drafting characteristics for trouble-free performance in spinning and for optimum yarn evenness. The cohesive force is defined as the force required to overcome fiber cohesion when the strand is being reduced in linear density and affects the drafting force. Experience has shown that the drafting force declines with increasing length of draft zone, and with increasing draft, but individual tests need to be performed to determine the extent and whether this is the case for all types of fibers. In this study the effects of drafting conditions such as draft ratio, roller speed, roller gauge, and the pressure of roller on the cohesive force of cotton, junlon, and modal roving were investigated. It was found that cohesive force declined with increasing draft ratio and likewise with increasing drafting zone length, but increased with increasing roller speed. For the raw materials investigated in this paper, cohesive force exhibited a decline with increasing draft ratio. And it was shown that the cohesive force of roving was also dependent on the roving twist.