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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.
Multiple Accusative Constructions Revisited
유연철 한국생성문법학회 2014 생성문법연구 Vol.24 No.4
It has been taken for granted that objects in the Multiple AccusativeCase Construction are licensed by the same head in the same caselicensing domain. This paper provides evidence that the initial objectmay be generated in a totally different position than the second object,way high in the sentence above VP where normal objects cannot belicensed. Evidence comes from certain interesting case alternationpatterns found in the Siphta Construction when it has two objects, asituation that has somehow gone completely undicussed in the literature. The evidence leads to the proposition that the initial accusative isbase-generated in position above matrix VP, in which there is simply noaccusative licensing head available and thus its case cannot be accountedfor within the standard theory of case. This study discusses theoreticalconsequences of this state of affairs in detail and offers a solution.
니켈크롬강과 ZrO2 접합체의 접합강도에 미치는 ZrO2 안정화제의 영향
유연철,이용철,장병록 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.10
Effects of ZrO₂ stabilizers such as 3㏖% Y₂O₃, 8㏖% Y₂O₃, and 9㏖% MgO on the joining phenomena of Ni-Cr steel/Al/ZrO₂ joints have been examined by the concept of solid state diffusion bonding. Irrespective of stahilizers used, the Al/ZrO₂ joint whose reaction layer could not be detected showed a good contact while the reaction layer of the Ni-Cr steel/Al was the diffusion layer of Al and Fe. The joint shear strength of this system did not show any distinct differences even though ZrO₂ stabilizers are varying. The maximun shear strength was 27 ㎫ under a pressure of 100 ㎫, temperature of 635℃, and the time of 120min. The residual stress resulting from the thermal expansion mismatch between ZrO₂ and A1 was different depending on the A1 layer depth sites. It was shown that compressive residual stress could be found at the Al/ZrO₂ interface while tensile residual stress at the NI-Cr steel/Al interface.
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.