머리말

유연철,나경환 한국소성가공학회 1999 단조 심포지엄 Vol.1999 No.6

알루미늄박의 최종어닐링에 따른 집합조직 형성

유연철,이중선,최상규 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.4

Cube texture after cold rolling has been studied to clarify effects of annealing time and temperature for Al foils with varying purifies from 99% to 99.99%. The foils of 0.1㎜ thickness were annealed finally at temperatures from 300℃ to 600℃ for 1, 3, 5 and 7 hours in 10^(-3)torr vacuum. It was found that the highest cube texture was obtained by repeating hot and cold rolling, and final annealing at 600℃ for 3 hours, while the formation of cube texture was reduced as the annealing time augmented from 3 to 7 at 600℃, because of the coarse recrystallization grain growth during annealing process. It could be known that forming time and leakage current more increased in low purity Al foil than high purity.

초저지연 인프라 기술

유연철,송종태,류정동,정태식,고제수,윤지욱,김선미,Ryoo, Y.C.,Song, J.T.,Ryoo, J.D.,Cheung, T.S.,Ko, J.S.,Youn, J.W.,Kim, S.M. 한국전자통신연구원 2017 전자통신동향분석 Vol.32 No.1

초저지연 인프라 기술은 인터넷 및 멀티미디어 정보 교환을 목적으로 만들어져 대역폭 증대에 힘써온 범용 통신망의 한계를 초월하여 실시간 시민감형 통신 및 산업 공정 제어 계측 정보 교환을 위하여 지연을 극소화 하고 확정할 수 있는 통신 인프라를 구축하기 위한 기술이다. 본고에서는 초저지연 인프라 구축을 위한 핵심 기술인 시간 제어 네트워크 기술과 전광 네트워킹 기술을 소개하고 산업 및 연구 기관의 관련 분야 활동 상황과 국제 표준화 동향에 대해 알아본다.

기독교 이단 신흥종교에 경도된 성인진입기 세대의 종교중독 연구: 자기심리학 관점에서

유연철 한국목회상담학회 2020 목회와 상담 Vol.34 No.-

This study sets out to investigate the easy propagation phenomenon of a newly-risen heretical religion in the Christian line among people in the emerging adult generation from the perspective of psychological development. This study also approaches youth who have experienced trauma after being deeply immersed in religious cults by analyzing their psychological experiences with the understanding of Self-Psychology by Heinz Kohut. This study aims to fulfill three objectives: (1) to identify the causes of easy addiction to the toxic faith of cults among youths in emerging adulthood, examining the stages of psychological and social development; (2) to examine religious addiction as a type of narcissistic wound in the inner world of the youth from the perspective of self-psychology; and (3) to propose some suggestions from Christian counseling in order to provide emotional care for youth immersed in cults. The findings show that shame and a sense of emptiness in the youth are caused by a deficiency of a self-structure during their childhood. This emotion derives from the frustration of narcissistic desire after the failure experience of self-object in early childhood. An unconscious act to fill this void may lead one to become immersed in religious cults and further to religion addiction. This study investigating religious addiction in the emerging adult generation is significant in three ways. First, the findings of this study can serve as counseling resources in psychotherapy with youth who have psychological trauma due to their experiences with a religious cult. Second, the present study is significant in that it proposes the importance of emotional care for the youth generation in the uneasy modern society. Third, the present study claims its significance by proposing the importance of Christian counseling to the established churches. 본 연구의 목적은 성인진입기 청년들이 기독교 이단 신흥종교에 경도되어 종교중독 현상을 보이는 심리적 원인을 밝히는 것이다. 이를 위해 청년들이 신흥종교에 경도되어 종교중독의 모습을 보이는 심리적 원인을 코헛의 자기심리학 이론으로 고찰하였다. 그리고 신흥종교 경험으로 심리적 외상을 입은 청년 내담자에 대한 상담을 진행하여 내담자의 심리를 자기심리학 관점에서 분석하였다. 결과적으로 청년의 시기에 개인 정체감이 형성되지 못한 청년들은 하나님 안의 자기라는 뚜렷한 신앙관이 미약하여 신흥종교의 포교활동에 쉽게 넘어 가는 것으로 나타났다. 그리고 이들 청년들의 심리내면에는 이미 어린 시절 나르시시즘 상처로 인한 수치심과 내면의 공허감, 즉 자기구조의 결핍이 있었음을 확인할 수 있었다. 이것을 가정과 기성교회에서 채울 수 없는 청년들은 이것을 채우기 위한 무의식적 행동이 신흥종교에 빠지는 모습으로 나타나는 것이며, 결핍을 계속 채우기 위하여 종교중독으로 발전하는 것을 알 수 있다. 여기서 주목할 점은 신흥종교는 이들 청년들의 심리적 결핍을 보상해 주는 역할을 통하여 청년들을 예속시킨다는 것이다. 본 연구의 의의는 유아에 대한 부모의 양육태도가 청년기 ‘개인 정체감’ 형성에 지대한 영향을 미친다는 점을 제시한 것이다. 그리고 개인 정체감이 미약한 기독 청년들이 신흥종교의 유혹에 빠지지 않도록 기성교회에 평소 청년들에 대한 정서적 돌봄과 기독교상담의 필요성을 제시하였다는데 있다..

DNA 바코드를 이용한 국내 유통 두족류 제품의 원재료 모니터링 연구

유연철,홍예원,김정주,김형수,강태선 한국식품위생안전성학회 2019 한국식품위생안전성학회지 Vol.34 No.5

Cephalopods are one of the most important fishery resources in the world because of their desirable taste and nutritional value. In south Korea, one of the countries in which a large amount of seafood is consumed, cephalopods (e.g., octopus, squid, and cuttlefish) have an annual consumption rate of over 400,000 metric tons. In this study, octopus and squid products (n=28) sold on the market were monitored by analyzing sequences of DNA barcode markers (cytochrome c oxidase subunit I and 16S ribosomal RNA genes). For species identification, the NCBI BLAST database was screened with the sequences and analyzed as a query. In this BLAST search, twelve squid products showed 99-100% sequence identity to Dosidicus gigas (n=3) and Todarodes pacificus (n=9). In the case of the other 16 products that were declared using octopus as raw materials on the labels, six products were identified as Cistopus taiwanicus (n=1), Amphioctopus marginatus (n=1), Scaeurgus unicirrhus (n=1), and Dosidicus gigas (n=3). Monitoring results indicated that a significant percentage (37.5%) of mislabeling was present in octopus products sold on the South Korean market.

비철금속합금 판재의 가공경화지수에 관한 연구

유연철,조원승 대한금속재료학회 1984 대한금속재료학회 학술대회 개요집 Vol.1984 No.1

열간비틀림변형에 의한 동의 동적재결정에 관한 연구

유연철,곽흥식 대한금속재료학회(대한금속학회) 1985 대한금속·재료학회지 Vol.23 No.12

The hot deformation behavior of copper has been studied in the temperature range from 0.55 Tm to 0.65 Tm and the strain rate range from 1.26×10(-3) S(-1) to 5.71×10(-3) by hot torsion. The hot softening mechanism of copper has been found to result from dynamic recrystallization through the flow curve and change of microstructure. Strain for the onset of dynamic recrystallization is represented by ε_c=0.039 LnZ-0.531 using Zener-Hollomon parameter Z and strain for the completion of dynamic recrystallization is represented by ε_x=0.276 LnZ-4.571. The time required for dynamically recrystallized grains decreased with increasing deformation temperature and strain rates. The dynamically recrystallized grains are smaller than statically recrystallized grains, and hardness is larger than statically recrystallized grains.

Ni - Fe 합금판재의 성형성에 관한 연구

유연철,이동녕 대한금속재료학회 1981 대한금속재료학회 학술대회 개요집 Vol.1981 No.1

V 첨가강의 고온유동곡선천이에 관한 연구

유연철,장병록,천제일 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.4

The transition from single- to multiple-peak dynamic recrystallization flow curves of V-microalloyed steel was studied by torsion test in the temperature range of 900℃ to 1000℃ and over a strain rate range of 2.0×10^(-2) to 1.0×10^0//sec. The grain size of the dynamically recrystallized specimens decreased with increasing Zener-Holloman parameter, Z without exhibiting any dependence on the initial grain size. The real transition occurred at the upper Z values, 2.0×10^(11)∼2.0×10^(10) than that determined by ε_x = ε_p. On the initial grain size D_0, dependence of the critical condition for the flow curve transition, Z_c, the equivalency with Z vs. D, relation was not observed. Therefore, the criterion D_o=2D_s has an applicability for only a limited range of Z. The constitutive equation of D, vs. Z could be described by D_s =897.865 Z^(-1.04)(㎛)

응고속도에 따른 Al-Fe 합금의 조직에 관한 연구

유연철,전정식,한형기 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.5

In order to investigate the microstructures of Al-(0.8, 1.3, 3)wt%Fe alloys, solidification processes were performed with water-cooled mold, air-cooled mold and in furnace. The intermetallic particles of these alloys were analyzed by X-ray diffraction, transmission electron microscopy and energy dispersive X-ray spectroscopy. The eutectic structure between Al and Al_6Fe particles was dominant and a few Al₃Fe particles were observed as cooling rate increased. With the increasing Fe contents and cooling rate, the formation of microcellular structures of Al grains largely containing globular or rod-liked Al_6Fe intermetallic precipitates were predominant. The crystallographic orientation relationships between Al matrix and particles were identified as [2(33)￣]_(Al)//[(11)￣0]_(Al₃Fe), ((311)￣)_(Al)//(2(22)￣)_(Al_6Fe), (011￣)_(Al)//(001)_(Al_bFe) and [1￣12]_(Al)//[010]_(Al₃Fe). The Al-Fe alloy exibited goad thermal stability and appreciable strength up to 450℃. The results indicate that high solidification rate is necessary to obtain high temperature strength Al-Fe alloy.