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필름 제조 연속공정의 FOM 시스템을 활용한 제조혁신 사례 연구
김순철,김재하,남기선,김수영 한국생산제조학회 2024 한국생산제조학회지 Vol.33 No.1
It is a continuation of productivity improvement owing to securing manufacturing competitiveness amid the rapidly changing global business environment, exchange rates, and large fluctuations in raw material prices. In particular, in the case of small and medium-sized manufacturing companies, difficulties such as manpower shortages and the impact of 52 h working hours are increasing. To overcome this, manufacturing innovation activities were proposed based on the FOM system using advanced manufacturing site data than the existing manufacturing innovation method, and the manufacturing innovation method was applied and the effectiveness was verified through a case company of the continuous production process of film manufacturing.
Condensation of a freely jointed tangent hard-sphere chain under gravity
김순철 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
An analytic expression for the contact value of the local density of a polymer uid under gravity was obtained from the force balance within polymers. Using Levin's argument for crystallization, we estimated the gravity-induced liquid-solid transition temperature for freely jointed tangent hardsphere chains. The weighted-density approximation based on the simple weighting function was used to calculate the local density distribution and the pressure of a freely jointed tangent hard-sphere chain at the interfaces. The theoretical results show that (i) the hard spheres easily solidify compared with the freely jointed tangent hard-sphere chains and that (ii) the gravity-induced transition temperature decreases with increasing number of monomers.
김순철,이재영,허남호,최동준,Kim, S.C.,Lee, J.,Hur, N.,Choi, D.J. 한국전자통신연구원 2021 전자통신동향분석 Vol.36 No.6
ATSC 3.0 is a next-generation terrestrial broadcasting standard that provides various functions and improved performance compared to the existing ATSC 1.0 High Definition standard. Based on the ATSC 3.0 broadcast system with IP-centric transport and coherence, it can provide personalized and personalized interactive services to TV viewers. However, the broadcasting system still has a structural limitation in that the service is deployed separately from broadcasters who are allocated a specific frequency and is expected to have different spectrum allocation for each market. To overcome this structural limitation and provide improved services compared with the current ATSC 3.0, preliminary studies were conducted to apply the core network concept of a communication network (particularly 5G) to ATSC 3.0 broadcasting. Finally, in february of this year, the ATSC TG3/S43 group for the development of the ATSC 3.0 Broadcast Core Network (BCN) standard was launched. This paper describes the background and current status of BCN standardization by ATSC TG3/S43, and future standardization prospects.
Population Inversion of Confined Symmetric Nonaddictive Hard-Sphere Mixtures
김순철,서숭혁,성백석 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.2
The integral equation recently introduced by Jagannathan et al. [J. Phys. Chem. B 109, 6764 (2005)] has been employed for studying the structure and the population inversion of the symmetric nonadditive hard-sphere mixtures confined in a hard slit pore. The calculated results show that the mole concentration and the nonadditivity parameters, as well as the width of the slit pore, play important roles in the population inversion. The population inversion curve related to the confinement effect is shifted towards lower fluid concentrations with decreasing width of slit pores and is terminated at the transition concentration. The results illustrate that the population inversion effect is prompted due to the extra repulsion between unlike species by the particle density development of lower concentration species near the slit wall, which is not observed in the highly nonadditivity system.
김순철,오혜주,임현정,현은희,최동준,Kim, S.C.,Oh, H.J.,Yim, H.J.,Hyun, E.H.,Choi, D.J. 한국전자통신연구원 2019 전자통신동향분석 Vol.34 No.3
Broadcast is evolving into media service aimed at user customization, personalization, and participation with high-quality broadcasting contents (4K/8K/AR/VR). A broadcast infrastructure is needed to engage with the competition for providing large-scaled media traffic process, platform performance for adaptive transcoding to diverse receivers, and intelligent service. Cloud service and virtualization in broadcast are becoming more valuable as the broadcasting environment changes and new high-level broadcasting services emerge. This document describes the examples of cloud and virtualization in the broadcast industry, and prospects the network virtualization of broadcast transmission infrastructure, especially terrestrial and cable networks.