합성 wustite 의 흑연에 의한 환원속도론

김선효,윤종규 대한금속재료학회(대한금속학회) 1979 대한금속·재료학회지 Vol.17 No.4

反應中 생기는 氣媒介體 CO와 CO₂를 通해 일어나는 合成 wu¨stite의 黑鉛에 의한 還元反應이 950℃∼1075℃ 溫度範圍에서 示差熱分析裝置에 의해 Ar분위기中의 등온 條件下에서 行해졌다. 還元反應에 대한 機構와 速度는 Rao에 의해 제시된 modified physico-chemical model에 의해 조사되었으며 아울러 이의 妥當性에 대한 硏究가 이루어졌다. 黑鉛함량 및 wu¨stite 粒子크기와 混合體에 加한 壓力이 還元反應速度에 미치는 영향도 分析검토하였다. 反應의 초기단계와 끝部分을 제외한全 還元反應은 Rao의 modified model에 잘 들어맞고 있음이 나타났다. 氣相媒介體를 通한 wu¨stite의 黑鉛에 의한 還元反應에 必要한 活法化에너지는 57Kcal/㏖임이 얻어졌고 이 값은 文獻과 잘 일치하고 있는 것으로 밝혀졌다. 還元反應速度式은 X=2au[1-exp(-kt)〕이 됨이 나타났다. Reduction reaction of synthetic Wustite by graphite through the gaseous intermediates CO and CO₂occuring during the reaction was carried out isothermally within the temperature range 950℃ to 1075℃ in an inert Ar atmosphere with T.G.-D.T.A. analysis technique. The mechanism and the rate of reduction reaction were investigated with modified physico-chemical model derived by Rao and the suitability of Rao's model to this reaction system was studied, too. The effects of variables such as C/FeO molar ratio, Wustite powder size to the rate of reduction reaction and the compactness of mixed powder were discussed. The overall reduction reaction but the initial stage and the tail part of reaction was considered to be well fitted to the modified physico-chemical model. The activation energy for the Wustite reduction by graphite through the gaseous intermediates is calculated to be 57Kcal/㏖ and this value is reasonably in good agreement with the literature. The rate equation of reduction reaction through the gaseous intermediates was found to be X=2av [1-exp (-kt).〕.

한국 화교의 한중 문장내적 코드전환(intrasentential code switching) 양상과 특성 -한국 거주 화교와 대만 거주 화교를 중심으로-

김선효 국제한국어교육학회 2019 한국어 교육 Vol.30 No.4

This paper examined the characteristics of intrasentential code-switching in Overseas Chinese Language in the Korea and Taiwan. After they entered into Korean Peninsula in 1882, Overseas Chinese in Korea(OCK) became a bilingual community. It focused on their natural discourse and analyzed their intrasentential code-switching structure. As a result of analyzing their spoken corpus(18 reporters, 116' 14'', 3,003 sentence tokens), the frequency data came out in the order of ‘Korean > mixed language > Chinese’. And it revealed that the generation factor and geographical factor in OCK co-related when they speak privately. OCK variation structure could be divided into lexical variation, grammatical marker variation and syntactic variation, and accounted for 12.3% (370/3,003) of the total sentence tokens. Particularly, those variants have been influenced by Korean interference, and OCK used to code switch under we-code communication even in adults.

한국어 학습자의 관형격조사 ‘의’의 사용 실태에 관한 소고

김선효 국제한국어교육학회 2007 한국어 교육 Vol.18 No.3

Sunhyo Kim. 2007. A Study of the Using Phenomena of Genitive Particle ‘eui’ of Korean Learner. Journal of Korean Language Education 18-3: 53-74. This paper aims to analyze an error phenomena and research a teaching method of Korean genitive particle ‘eui’ of Korean learner who are Japanese native speaker and have the middle level of Korean. The error types of Korean learner are nominal structure, appositive structure, case particle structure and time adverb. The most complicate structure is nominal, because the nominal structure of Japanese is only ‘N1の N2’, but Korean is divided ‘N1eui N2’, ‘N1(eui) N2’ and ‘N1 N2’. To resolve of this problem, it is useful to always use ‘N1 N2’ except the indispensable structure of ‘N1eui N2’. The reason is Korean has a tendency to don’t use ‘eui’ when it is optional.

대학 글쓰기에서의 한국어 동료튜터링(peer tutoring)의 과정과 방법-외국인 및 재외국민 학습자를 중심으로

김선효 한국교양교육학회 2013 교양교육연구 Vol.7 No.5

In this paper it presented the process of peer tutoring for Korean academic writing classes and explored the proper methods for Korean learners who are foreigners and Korean oversees. Peer tutoring is interactive program that tutors who were learned previously or have more knowledge support and help tutees who have less knowledge, but tutors and tutees are not hierarchical relation but interactive and cooperative. Peer tutoring has three methods; directive tutoring, nondirective tutoring and neutral tutoring. Among those methods, neutral tutoring is much proper to Korean learners. In Korean peer tutoring program some problems came out, but it can be overcome if tutors regards peerness as important and tutors, tutees and instructors have cooperative relationship each other. 본 연구는 외국인 및 재외국민 학습자를 대상으로 하는 대학 글쓰기에 활용할 수 있는 한국어 동료튜터링의 과정을 제시하고 이에 적합한 튜터링 방법을 모색하는 데 목적을 두었다. 동료튜터링은 선행 학습을 한 튜터가 학습자의 부족한 영역을 도와주는 학습 보조 활동으로서, 튜터링의 방법에는 튜터의 직접적 개입을 허용하는 지시적 튜터링과 그렇지 않는 비지시적 튜터링 그리고 두 튜터링 유형을 결합한 중립적 튜터링이 있다. 이 세 유형 중에서 외국인 및 재외국민 학습자에게는 오류의 유형과 학습자의 한국어 능력에 따라 중립적 튜터링을 실시하는 것이 적합함을 알 수 있었다. 한국어 동료튜터링의 과정 중에 튜터와 학습자 간의 관계성, 학습자의 학습 의욕 저하 등의 한계가 드러날 수 있으나 튜터가 동료성을 중시하면서 학습자를 도와주면 성공적인 튜터링을 실시할 수 있었다. 튜터와 학습자가 서로 주축이 되고 교수자가 보조적으로 도와주는 상호 협력적 관계가 한국어 동료튜터링을 이끄는 동력이라 할 수 있다.

일본어 모어 화자의 정도부사의 사용과 오류 양상 -‘아주, 너무’를 중심으로-

김선효 국제한국어교육학회 2009 한국어 교육 Vol.20 No.1

The aim of this paper is to analyze the erroneous phenomena of Korean degree adverb, and to present a method of teaching of degree adverb for the intermediate Japanese learners of Korean. We examine Korean degree adverbs ‘aju’ and ‘neomu’ which have high frequencies in the corpus of Japanese learners of Korean, and then discern the erroneous phenomena in the view of local error and global error. Through this analysis, it is found those errors have a deep relationship with Context of Learning. Consequently, this results would be useful to teach the distinctive characteristics of ‘aju, neomu, maeu, deige’ which are based on the co-occurrent relationship of degree adverb and adjective. (Osaka University)

Use of Vitamins, Minerals, and Other Dietary Supplements by 17- and 18-Year-Old Students in Korea

김선효,Ji H. Han,Qin Yan Zhu,Carl L. Keen 한국식품영양과학회 2003 Journal of medicinal food Vol.6 No.1

Various types of dietary suplements (DS) are popularly taken by young individuals. We sur-veyed 1,190 Korean senior high school third grade students for their DS use, motivational fac-tors for this use, and potential dietary consequences of vitamin/mineral suplement (VMS)use. The use prevalence of DS including VMS, tonic medicines, manufactured health foodsuplements, cordial food suplements, and drink rehabilitators was 54%. VMS were takenmost frequently, followed by tonic medicines and manufactured health food suplements.VMS use was highest in individuals who had a significant concern for their overall healthand in those from families with a high socioeconomic level and with parental use of DS. To-tal daily study time of DS users was only slightly longer than that of nonusers. The VMSmost frequently used were vitamin C and multivitamins. More than 46% of other DS users,and 58% of VMS users, had increased their intake of suplements during third grade rela-tive to the previous year. VMS users had a more positive view of the potential health bene-fit of VMS than did nonusers. Vitamin and mineral intakes from VMS occurred over a widerange, with mean intakes typically exceeding the Korean and Canadian-U.S. RecommendedDietary Allowances. For a significant number of individuals, intakes of vitamin A, niacin,folic acid, vitamin C, calcium, iron, and zinc exceeded the Tolerable Uper Intake Levels.Given the widespread use of DS by older tenagers, the contribution of these suplementsto their overall health and well-being is a subject that clearly merits aditional study.27

포스터발표 : 비타민 무기질 보충제 복용자의 영양소 섭취량과 안전 한계치와의 비교 - 전국에 거주하는 중년기를 중심으로 -

김선효 한국영양학회 1998 추계학술대회초록 Vol.- No.-

한국화교 청소년의 이중언어와 화교식 변이구조 -부산과 인천의 화교중학교를 중심으로-

김선효 인천대학교 중국학술원 2020 비교중국연구 Vol.1 No.1

This paper investigated the code-switching of bilingual Korean-Chinese adolescents living in Busan and Incheon, South Korea. It used survey methodologies to analyze the variance of Overseas Chinese in Korea’s (OCK) of 87 Korean-Chinese adolescents from these regions to extrapolate an OCK Linguistic Variation Structure. Based on these results, the research found that while old OCK youth used the same or similar expressions of variation structure, new OCK youth couldn’t understand and did not use in. The data presented several findings. First, OCK youth showed the following tendency in preferred language construction for their daily speaking needs: Korean > Chinese > Korean-Chinese Mixed. Second, in Busan, third-generation Chinese adults showed signs of OCK Linguistic Variation Structure in their speaking (speaking in Korean), besides old OCK youth also did. Third, OCK Linguistic Variation Structure had no interfering effect in adopting the Busan dialect though the probability as such with older community youth remains high. Fourth, while OCK Linguistic Variation Structure seemed to have influence on old OCK youth, it did play roles in language acquisition and speaking of new OCK youth. Fifth, OCK Linguistic Variation Structure showed no signs of leading to second language acquisition problems; however, it did present evidence of influencing the lexifier language adopted in language contact environments. 이 연구는 부산과 인천에 거주하는 한국화교 청소년들을 대상으로 코드전환 현상 및 화교식 변이구조의 인식과 실현 양상을 살펴보는 것을 목적으로 하였다. 화교식 변이구조는 한국어나 중국어가 변이되어 굳어진 구조로서, 부산과 인천에 거주하는 화교 청소년 총 87명(신화교와 구화교)을 대상으로 화교식 변이구조의 사용 양상을 설문조사하여 그 특징을 살펴보았다. 그 결과, 구화교 청소년은 동일하거나 유사한 화교식 변이구조 표현을 사용하였지만 신화교 청소년은 이러한 표현을 거의 이해하지 못하거나 사용하지 않았다. 한국화교 청소년이 사용하는 이중언어의 특징은 첫째, 일상생활에서 ‘한국어 > 중국어 > 혼합어’ 순서로 언어를 사용한다. 둘째, 화교식 변이구조는 부산화교 3세에서만 통용되는 것이 아니라 부산과 인천에 거주하는 청소년들도 사용하고 있었다. 셋째, 화교식 변이구조는 부산 방언의 간섭이 아니라 구화교 공동체 간에 통용되고 있음을 입증하고 있다. 넷째, 화교식 변이구조는 구화교의 공동체에서 굳어진 표현이지만 신화교에도 영향을 끼치고 있었다. 다섯째, 화교식 변이구조는 제2언어 학습과정에 나타나는 오류나 중간언어의 일시적 현상이 아니라 언어 접촉 환경에서 흔히 나타나는 지배어의 영향과 밀접한 관계를 가진다는 것을 알 수 있다.

일본어권 한국어 학습자를 위한 어휘적 연어 학습 방안

김선효 이중언어학회 2010 이중언어학 Vol.44 No.-

KIM, SUNHYO. 2010. 10. 30. The Teaching Methods of Lexical Collocations for Japanese Learners of Korean. Bilingual Research 44, 25-47. This paper makes clear the teaching methods to express Korean lexical collocations for Japanese learners of Korean. In the basis of the lists of Korean lexical collocations, these are classified 5 types according to the characteristics of structures which are translated into Japanese. 1st type has the same structure between Korean and Japanese, 2nd type is translated into different nouns and 3rd type different verbs. 4th type has different nouns and verbs both of them, or different syntactic structures. 5th type consists of Korean words that have no in Japanese. For Japanese learners can study Korean lexical collocations efficiently, contrastive linguistics will be useful to them. (Seoul National University)

표피효과를 고려한 중전압 전력선 채널특성 분석

김선효,이원태,이영철 한국정보통신학회 2002 한국정보통신학회논문지 Vol.6 No.5

본 논문에서는 고속데이터 전송을 위한 중 전안 전력선로의 특성을 표피효과를 고려한 전송 파라메타로써 채널특성을 분석하였다. 중전압 통신 선로의 특성임피던스는 고주파 개념을 이용한 산란 계수법으로 구하였으며 광대역 특성을 갖는 결합기를 이용하여 0∼30MHz 주파수 대역에서 중전압 전력선의 채널특성을 측정하였다. 통신 선로의 표피효과를 고려하였을 경우 주파수에 대한 선로의 감쇠 특성은 선형적으로 감소하였으나 표피효과를 고려하지 않았을 경우에는 선로의 감쇠 특성은 급격히 감소함은 알 수가 있었다. 임피던스 특성은 주파수가 높을수록 임피던스 크기가 점점 낮아지며 변화량도 적어짐을 알 수가 있었다. In this paper, we analyzed a medium voltage power line characteristics considering the skin effect for high speed data transmission. Medium power-line characteristics impedance was obtained by the S-parameter method which is used in high frequency band. Power line channel characteristics was measured using it designed coupler, it is a wide band coupler between medium powe-line and measurement system. Attenuation characteristics along the frequency was decreased linearly when skin effect was considered but attenuation characteristics along the frequency was decreased linearly when skin effect was not considered. Impedance was showed lower and lower in proportional to frequency, and variation was decreased in proportional to frequency.