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박철희 崇實大學校 2000 論文集 Vol.30 No.1
We present a preliminary measurement of the rate of gluon splitting into bottom quarks, g→b□ , in hadronic Z0 decays collected by SLD between 1996 and 1998. The analysis was performed by looking for secondary bottom production in 4-jet events of any primary flavor. 4-jet events were identified, and a topological vertex-mass technique was applied to each jet in order to identify b or □ jets. The upgraded CCD based vertex detector gives very high B-tagging efficiency, especially for B hadrons of the low energies typical of this process. The two most nearly collinear b/□ jets were tagged as originating from g→bb. We measured the rate of secondary b/□ production per hadronic event, gb□, to be (3.07 ± 0.71(stat.) ± 0.66(syst.)) x10³ (preliminary).
THE PARSER GENERATORS (pp.61-84)
박철희,유재우,장천현,오세만,손덕주,한선영 한국정보과학회 1978 정보과학회논문지 Vol.5 No.2
This paper deals with actual constructions of programs for experiments in several parsers based on the theoritical results of others that represent on of the most fruitful contributions in computer science. Specifically the report deals with (1) a general computer representation of grammar (2) a precedence parser generator, (3) a LL (1) parser generator, (4) a practical SLR (1)/LALR (1) parser generator.
Compartment Syndrome Following Total Knee Arthroplasty: Clinical Results of Late Fasciotomy
박철희,이승혁,강동근,조계열,이상학,김강일 대한슬관절학회 2014 대한슬관절학회지 Vol.26 No.3
Compartment syndrome after total knee arthroplasty (TKA) is a rare complication. Because of its rarity, it may be overlooked and misdiagnosed as peroneal nerve palsy or deep vein thrombosis. This misdiagnosis could have a profound impact on the patient’s outcome. We report a case of a 77-year-old female who developed unilateral compartment syndrome in the calf after staged bilateral TKA at an outside clinic. The patient presented with medical complications related to compartment syndrome: rhabdomyolysis and myoglobinuria, which caused acute renal failure. Thus, we performed late fasciotomy one week after symptom onset to debride necrotic tissue and salvage the compartment. In the discussion section, we will discuss risk factors for compartment syndrome after TKA, results of late fasciotomy and other indications for surgical treatment of compartment syndrome.
편극된 Z^0의 bb ̄g로의 붕괴를 이용한 대칭성 검증
박철희 崇實大學校 2000 論文集 Vol.30 No.1
Angular asymmetries have been measured in polarized Z0 decays to b□g collected by the SLD experiment at the SLC. A high purity b□g event sample is selected utilizing B lifetime information given by the SLD CCD pixel vertex detector and the stable micron-size SLC beams, and the b- and □-jets are identified using lifetime information and momentum-weighted track charge. The forward-backward asymmetry is observed in the b-quark polar angle distribution, and the parity-violation parameter is measured to test the Standard Model. Two angular correlations between the three-jet plane and the Z0 polarization are studied. The CP-even and T-odd, and the CP-odd and T-odd, angular asymmetries are sensitive to physics beyond the Standard Model. We measure the expectation values of these quantities to be consistent with zero and set limits on the correlations at the 5% level.
박철희 대한기계학회 1987 大韓機械學會誌 Vol.27 No.6
본 글에서는 동력학에서 좀 어렵게 느껴지는 코리올리 힘(Coriolis force)을 쉽게 알 수 있도록 하기 위하여 몇가지 관련사례를 써 본 것이다. 먼저 뉴우튼의 법칙에 관한 통찰을 설명하고, 코리올리 힘의 공학적 사례를 몇가지 들었다. 그리고, 기초동력학에서 일반적으로 다루지 않는 푸코진자(Foucault's pehdulum)를 쉽게 설명하고, 지상에서 수평운동할 때 편차계산을 쉽게 할 수 있는 방법을 설명하고자 한다.