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GRM(Gaussian Reflectivity Mirror)을 이용한 불안정 공진기형 Q-스위치 Nd:YAG 레이저의 출력특성
이희철,김용평,Lee, Hee-Chul,Kim, Yong-Pyung 한국광학회 2005 한국광학회지 Vol.16 No.2
출력거울로 GRM(Gaussian reflectivity mirror)을 채택한 불안정 공진기를 구성하여 그 Q-스위치 출력의 특성을 분석하였다. 입력 전기에너지가 55J 일 때 1064 nm의 기본파장에서 470 mJ, 532 nm의 제2고조파 파장에서 280 mJ의 출력 에너지를 얻었다. 출력빔의 발산각은 1.7 mrad 이었으며 근접장 영역에서 Top-Hat 형태의 빔을 얻을 수 있었다. We investigated the operational characteristics of a Q-switched Nd:YAG laser, which has an unstable resonator with a GRM(Gaussian reflectivity mirror). With electrical input energy of 55 J, we obtained the fundamental energy of 470 mJ at 1064 nm and the frequency doubled energy of 280 mJ at 532 nm. The Top-Hat profile of the output beam was obtained at the near field, and beam divergence was 1.7 mard.
Implicature and Process Leading to Implicature
이희철 대한영어영문학회 2005 영어영문학연구 Vol.31 No.2
There is said to be two different kinds of meaning: one is sentence (word) meaning, the other speaker meaning. (Hurford & Heasley 1996: 3) Entailment and implicature both belong to inference. However, entailment concerns sentence meaning and implicature speaker (utterance) meaning even though we need to consider hearers to calculate the implicature of an utterance as shown in this paper. Grice (1975) claims that there must be a place for the natural counterparts of logical devices. In this vein, he discusses implicatures in terms of the Cooperative Principle and conversational maxims. Horn (1984) boils down the Gricean maxims to two fundamental principles, such as the Q Principle and the R Principle, and deals with implicatures in those terms. This paper discusses detachability related directly to conventional implicatures vs. conversational implicatures, and the inferential process leading to the implicatures, with illuminating English examples.
Pyrromethene 597 고체 색소 레이저의 제작 및 출력 특성
이희철,김용평,Lee, Hee-Chul,Kim, Yong-Pyung 한국광학회 2005 한국광학회지 Vol.16 No.2
PMMA에 pyrromethene 597(PM597) 색소를 주입하여 고체 색소를 제작한 후 그 레이저 출력특성을 분석하였다. 펌핑 광원으로 Q-스위치 Nd : YAG 레이저의 제 2 고조파를 사용하여 발진 중심파장 585 nm에서 최대 광 변환효율 $76\%$를 얻었다. 광안정성을 증가시키기 위해 단일항 에너지 상태의 산소 제거제인 DABCO(1,4-diazabicyclo [2,2,2]octane)를 주입하여 반복율 4 Hz, 출력에너지 250 mJ, 100,000번 이상의 펄스 출력을 얻었다. We fabricated pyrromethene 597(PM597) solid-state dyes which were dissolved in PMMA(poly- methylmethacrylate) and characterized the lasing characteristics. The laser was end-pumped by a frequency doubled Q-switched Nd : YAG laser. We obtained the slope efficiency of $76\%$ at lasing wavelength of 585 nm. We demonstrated the laser lifetime to be more than 100,000 shots with output energy of 250 mJ and repetition rate of 4 Hz by adding singlet oxygen quencher DABCO(1,4-diazabicyclo [2,2,2]octane) to the solid-state dye.
Analysis of EBS Listening Test Items: Based on the Rasch Model
이희철,심재우,김나유 한국현대영어영문학회 2014 현대영어영문학 Vol.58 No.4
This study analyzed a set of high school English listening test items designed by the Education Broadcasting System (EBS). The three main purposes of the study were to identify erroneous ones among 20 items that do not fit a Rasch analysis model, describe difficulty levels in comparison to students’ ability levels, and review the overall test composition. The Winsteps, a Rasch model statistical software was used for statistical analyses. The software allows users to analyze dichotomous data for investigating problems that are inherent in test items. The results from the Winsteps revealed that two items out of a total of 20 items did not follow Rasch model assumptions. That is, the subjects’ responses to the two items were random at best, regardless of the subjects’ ability levels. The analysis of item difficulty levels indicated that most subjects were not able to get item number 15 correct because of a low frequency word. In addition, the subjects seemed to have difficulty finding a right answer since another choice was acceptable as a right answer due to the context. Moreover, the analysis of the construction of test items showed some mistakes at linguistic and discourse levels, calling for more thorough preparation of listening test items.
Frame Semantice and Analysis pf Some Words: Climb and Syncategorematic Modifiers
이희철 대한영어영문학회 2004 영어영문학연구 Vol.30 No.1
Jackendoff (1989) contains an analysis of the meaning of the verb climb in terms of preference rules. In such an analysis, we can define a given use of a word as more ‘prototypical’ if more of the “preference rules” are satisfied in the situation in which the word is used. In his two frame semantics articles, Fillmore (1982, 1985) suggests another analysis of ‘prototype effects’ of the kind Rosch (1981) studies. The question in part of this paper is, what would be the analysis of climb in a frame semantics approach? How does it account for the relative prototypicality of the uses of the word climb?It has frequently been discussed (e.g., Austin 1964) that a word like imitation does not semantically modify a noun in the standard ‘set intersection’ way. For example, something correctly described as imitation coffee looks and tastes like coffee; but, whatever it is, it is not made of coffee beans. (Fillmore 1982: 133) The second half of this paper will discuss the so-called syncategorematic terms like imitation, which do not work like other noun modifiers.