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Interfacial Properties of Electrodeposited Carbon Fiber/Epoxy Composites using Electro-Micromechanical Techniques and Nondestructive Evaluations

  • Park, Joung-Man;Lee, Sang-Il
    • Macromolecular Research
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    • 제9권1호
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    • pp.20-29
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    • 2001
  • Interfacial adhesion and nondestructive behavior of electrodeposited (ED) carbon fiber rein-forced composites were evaluated using electro-micromechanical techniques and acoustic emission (AE). The interfacial shear strength (IFSS) of the ED carbon fiber/epoxy composites was higher than that of the untreated fiber. This might be expected because of the possibility of chemical or hydrogen bonding in an electrically adsorbed polymeric interlayer. The logarithmic electrical resistivity of the untreated single-carbon fiber composite increased suddenly to infinity when fiber fracture occurred, whereas that of the ED composite increased relatively gradually to infinity. This behavior may arise from the retarded fracture time due to enhanced IFSS. In single- and ten-carbon fiber composites, the number of AE signals coming from interlayer failure of the ED carbon fiber composite was much larger than that of the untreated composite. As the number of the each first fiber fractures increased in the ten-carbon fiber composite, the electrical resistivity increased stepwise, and the slope of the logarithmic electrical resistance increased.

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발성시 음도 및 강도의 변화가 음성분석검사 결과에 미치는 영향 (The Effect of Frequency and Intensity of /a/ Phonation on the Result of Acoustic Analysis)

  • 손영익;윤영선;권중근;추광철
    • 대한후두음성언어의학회지
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    • 제8권1호
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    • pp.12-17
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    • 1997
  • Measuring phonatory stability using MDVP(Multi-dimensional voice program, Kay Elemetrics Corp., NJ, USA) are becoming popular in many Korean clinics and laboratories, yet questions about standardization and reference values have remained. The purpose of present study was to examine the effects of frequency and intensity variation on the results of acoustic analysis related to phonatory stability. Twenty young adults(ten females and ten males) were asked to sustain vowel /a/ for more than 3 seconds under 9 different pitch and loudness conditions. Using MDVP, nine voice samples were analyzed, and jitter percent, fundamental frequency variation, shimmer percent, peak amplitude variation, noise to harmonic ratio, amplitude tremor intensity index, and degree of subharmonics were compared. The results showed that intensity changes can significantly affect various phonatory stability measures, and the lowest perturbation values can be obtained from slightly louder(10dB) phonatory condition than comfortable level phonation.

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한국 담수산 복모류 Chaetonotidae과의 분류 (Freshwater Chaetonotid Gastrotrichs in Korea)

  • 이지민;장천영
    • Animal Systematics, Evolution and Diversity
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    • 제16권1호
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    • pp.87-104
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    • 2000
  • 1994년 5월부터 남한의 다향한 담수역 65개 지점에서 채집한 표본들을 관찰한 결과 모두 10종의 담수산 복모류를 동정하였다.: Polymerurus rhomboides(Stokes), P. nodicaudus(Voigt), Lepidodermella squamata (Dujardin), Chaetonotus(Zonochaeta) succinctus Voigt, C. (Z.) bisacer Greuter, C. (Euchaetonotus) polyspinosus Greuter, C. (E.) heterospinosus Balsamo, C. (E.) heideri Brehm, C. (E.) zelinkai Grunspan, and C.(Hystricochaetonotus) persetosus Zelinka. 저자들은 이들을 재기재하고 도판과 검색표를 작성하였다. 본 연구는 한국 담수산 복모류에 관한 최초의 기록이다.

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The Seventeen Plane Groups (Two-dimensional Space Groups)

  • 김진규;김윤중;김영상;고재중;강상욱;한원식;서일환
    • 한국결정학회지
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    • 제16권1호
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    • pp.11-20
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    • 2005
  • Two-dimensional lattice에 존재하는 6가지 기본대칭과 5개의 Bravais lattice를 유도하였고 10개의 two-dimensional point groups를 5개의 각 Bravais lattice에 따라 분류하였다. 마지막으로 10개 point groups에 속한 17 two-dimensional space groups를 고찰하였다.

한국조경학회지 게재논문 조경식물 분야의 연구경향 (Research Trends concerning Landscape Plants in the Journal of the Korean Institute of Landscape Architecture)

  • 강호철
    • 한국조경학회지
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    • 제31권5호
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    • pp.130-138
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    • 2003
  • This study aims to review the research trends concerning landscape plants and to foresee the next trends in Korea. The research scope was limited to the articles listed in the Journal of Korean Institute of landscape Architecture. The number of articles related to landscape plants was calculated for five-year-period over 30 years and for groups of ten issues from 1973 until 2003. Of all the related articles, subjects or materials, method types, and contents were categorized and analyzed for groups of ten issues from 1973 until 2003. The results, of the research were as follows. Of 1,018 articles in total, there were 930 paper-type, 52 discourse-type, and 36 remains. Of 212 related articles, there were 205 paper-type, 3 discourse-type, and 4 remains. Of 232 subject articles, there were 115 woody-related, 47 herbaceous-related, and 33 soil-related articles. Of 221 method articles, there were 89 experiment, 54 field research 33 planting articles. Of 243 content articles, there were 47 investigation, 36 construction, 34 environmental effect, and 33 maintenance articles.

강세에 따른 영어 모음의 포먼트 변이와 모음 발음 교육에의 응용 (The Formant Frequency Differences of English Vowels as a Function of Stress and its Applications on Vowel Pronunciation Training)

  • 김지은;윤규철
    • 말소리와 음성과학
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    • 제5권2호
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    • pp.53-58
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    • 2013
  • The purpose of this study is to compare the first two vowel formants of the stressed and unstressed English vowels produced by ten young males (in their twenties and thirties) and ten old males (in their forties or fifties) from the Buckeye Corpus of Conversational Speech. The results indicate that the stressed and unstressed vowels, /i/ and $/{\ae}/$ in particular, from the two groups are different in their formant frequencies. In addition, the vowel space of the unstressed vowels is somewhat smaller than that of the stressed vowels. Specifically, the range of the second formant of the unstressed vowels and that of the first formant of the unstressed front vowels were compressed. The findings from this study can be applied to the pronunciation training for the Korean learners of English vowels. We propose that teachers of English pay attention to the stress patterns of English vowels as well as their formant frequencies.

Mahalanobis Taguchi System을 이용한 다변량 시스템의 해석에 관한 연구 (Analysis of Multivariate System Using Mahalanobis Taguchi System)

  • 홍정의;권홍규
    • 산업경영시스템학회지
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    • 제32권1호
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    • pp.20-25
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    • 2009
  • Mahalanobis Taguchi System (MTS) is a pattern information technology, which has been used in different diagnostic applications to make quantitative decisions by constructing a multivariate measurement scale using data analytic methods without any assumption regarding statistical distribution. The MTS performs Taguchi's fractional factorial design based on the Mahahlanobis Distance (MS) as a performance metric. In this work, MTS is used for analyzing Wisconsin Breast Cancer data which has ten attributes. Ten different tests are conducted for the data to determine if the patient has cancer or not. Also, MTS is used for reducing the number of test to define the relationship between each attribute and diagnosis result. The accuracy of diagnosis is compare with two different previous research.

혈액투석 환자의 식이와 수분관리에 대한 간호사의 경험 (Nurses' Experience of Managing Diet and Fluid in Hemodialysis Patients)

  • 염은이;서금숙
    • 재활간호학회지
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    • 제17권1호
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    • pp.27-37
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    • 2014
  • Purpose: The purpose of this study was to understand nurses' experience of managing diet and fluid in hemodialysis patients and to provide helpful information in improving care of hemodialysis patients. Methods: Data were collected through in-depth interviews with ten nurses who had experience of providing care to hemodialysis patients. Colazzi's phenomenological method was used to analyze data. Results: Twenty themes were identified in the first stage of data analysis and were later categorized into ten theme clusters, of which four categories were derived. The four categories were 'developing a strong feeling of responsibility for management', 'acknowledging limits in performing duties', 'providing patient-centered education' and 'becoming a guide for the long treatment process'. Conclusion: The study results will be useful for improving nursing curriculum to ensure more effective and successful diet and fluid management in hemodialysis patients.

Galatheoid squat lobsters (Crustacea: Decapoda: Anomura) from Korean waters

  • Kim, Jung Nyun;Kim, Mi Hyang;Choi, Jung Hwa;Im, Yang Jae
    • Fisheries and Aquatic Sciences
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    • 제19권8호
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    • pp.34.1-34.12
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    • 2016
  • Ten species of Galatheoidea (squat lobsters), belonging to two families, were collected in the Korean exclusive economic zone: Galathea balssi Miyake and Baba, 1964, Galathea orientalis Stimpson, 1858, Galathea pubescens Stimpson, 1858, and Galathea rubromaculata Miyake and Baba, 1967 belonging to Galatheidae; Bathymunida brevirostris Yokoya, 1933, Cervimunida princeps Benedict, 1902, Munida caesura Macpherson and Baba, 1993, Munida japonica Stimpson, 1858, Munida pherusa Macpherson and Baba, 1993, and Paramunida scabra (Henderson, 1885) belonging to Munididae. The present study comprises the morphological description of these ten species, including drawings and color photographs, a brief review of their regional records, and a key for their identification. Although all species are common in Japanese waters, G. balssi, G. rubromaculata, B. brevirostris, C. princeps, M. caesura, and M. pherusa are new to Korean marine fauna.

상악 시적의치의 후연 연장방법이 Resin 의치상의 변형에 미치는 영향에 관한 실험적 연구 (A Study on the Effect of the Wax Extension Method of Posterior Palatal Seal on the Vertical Occlusal Change of Processed Dentures)

  • 오세윤
    • 대한치과기공학회지
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    • 제6권1호
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    • pp.5-10
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    • 1984
  • This experimental study was performed to investigate the effect of the wax extension method of posterior palatal seal area, introduced by Vig, on the amount of the vertical occlusal change of processed dentures. Twenty samples of maxillary wax trial dentures were constructed. Among them, the posterior palatall seal of ten samples were extended with wax over the posterior wall of the cast while that of the other ten were not. Then all were processed with self-curing resin and the amount of the vertical occlusal change was compared. The obtained result was that this method was proved to be effective in reducing the amount of the vertical occlusal change occuring in denure proccsing.

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