• Title, Summary, Keyword: Continuous Process

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Uniform Ergodicity and Exponential α-Mixing for Continuous Time Stochastic Volatility Model

  • Lee, O.
    • Communications for Statistical Applications and Methods
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    • v.18 no.2
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    • pp.229-236
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    • 2011
  • A continuous time stochastic volatility model for financial assets suggested by Barndorff-Nielsen and Shephard (2001) is considered, where the volatility process is modelled as an Ornstein-Uhlenbeck type process driven by a general L$\'{e}$vy process and the price process is then obtained by using an independent Brownian motion as the driving noise. The uniform ergodicity of the volatility process and exponential ${\alpha}$-mixing properties of the log price processes of given continuous time stochastic volatility models are obtained.

Continuous Commissioning Process and Application (Continuous Commissioning의 절차와 적용)

  • Cho, Young-Hum
    • Journal of the Korean Solar Energy Society
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    • v.30 no.5
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    • pp.77-84
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    • 2010
  • This paper presents the continuous commissioning process, information on the case study facility, improved system operation, and building energy consumption measures before and after continuous commissioning implementation. Continuous commissioning is an ongoing process to resolve operating problems, improve comfort, optimize energy use and identify retrofits for existing commercial and institutional buildings and central plant facilities. Continuous commissioning process consists of two phases. The first phase is the project development phase and the second phase implements and verifies project performance. Results of a case study show that continuous commissioning implementation can reduce energy costs. The energy reports show the electricity savings of 22% and gas savings of 47% on an average.

Preparation of Highly Cross-Linked, Monodisperse Poly(methyl methacrylate) Microspheres by Dispersion Polymerization; Part II. Semi-continuous Processes

  • Lee, Ki-Chang;Lee, Sang-Yun
    • Macromolecular Research
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    • v.16 no.4
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    • pp.293-302
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    • 2008
  • In our previous publication, the problem of particle deformation and coagulation at the nucleation stage in the presence of cross-linker was intensely studied by seeded batch dispersion polymerization of methyl methacrylate (MMA). In the present work, highly cross-linked, monodisperse PMMA particles were prepared under various reaction conditions by seeded semi-continuous process. Monodisperse, $6.5{\mu}m$-diameter PMMA particles containing up to 8 wt% of DVB or EGDMA were successfully made by seeded semi-continuous process and multi-semi-continuous addition process, respectively. Therefore, this study shows that seeded semi-continuous process is more effective and efficient to prepare highly cross-linked, monodisperse particles than non-seeded and seeded batch processes.

A Study on the Information Technology and Competition Strategy - Focused on Continuous Competitive Advantage - (정보기술(IT)과 경쟁전략에 관한 연구 -지속적 경쟁우위와의 관련을 중심으로-)

  • Lim, Sang-Hyeok
    • International Commerce and Information Review
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    • v.8 no.1
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    • pp.15-31
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    • 2006
  • There is no overdoing of enforcement of the importance of strategical mind which indicates future direction when management environment around organizations are variously changing. This document describers preceding and comparison research about competition strategy, competitive advantage and IT centered on organizations' common issue "Guarantee of Continuous Competitive Advantage" and researched various factors to determined if Information Technology is functioning properly through the cases of excellent organizations operating continuous competitive advantage Continuous competitive advantage's source is evaluating positively about resource based view which is described by innovation of business process. However, reality of operating continuous competitive advantage with difficult imitation of business process' "Time" "Complexity" is insufficient. Confirm how continuous competitive advantage is operated in reality by accepting easy application of "Simple Concise" business process. Confirm existence of information technology capability creating difficult imitation is functioning as a source of continuous competitive advantage, not Information Technology resource supporting business process.

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Process Improvement of Continuous Casting Mold using CAM Program (CAM 프로그램을 이용한 연속주조 몰드의 공정 개선)

  • 이종선
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.228-234
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    • 1998
  • This study is object to process improvement of continuous casting mold. For process improvement of continuous casting mold using CAD, CAM software and CNC machining center. CAM software is purpose of G-code generation for CNC programming. Then CAM software and CNC machining center are connect to RS-232C cable.

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Development of Mash-Seam Welding Process by Flat Electrode Continuous Welding (평판전극 연속타점에 의한 매쉬심 용접기법 개발)

  • 조상명;조호재
    • Journal of Welding and Joining
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    • v.21 no.5
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    • pp.513-517
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    • 2003
  • Resistance welding processes are widely used in automotive applications. In particular, Mash-Seam resistance welding is typically used in Tailored Blank process. If spot welds are changed to a continuous weld, it's easy to reduce noise and to be more stable in cars. A arc welding, laser welding, seam welding using wheel electrode are available to make continuous welds on a car body, but they demand operator with advanced skills and expensive cost to develop. Therefore, flat electrode continuous mash-seam resistance welding process has been used to improve the weak points in currently available system in lap seam welding. This developed process has much more strength and air tightability, and also has much better plastic workability than laser welding. Moreover, commercial RSW machine can be readily used in this welding process.

A continuous time asymmetric power GARCH process driven by a L$\'{e}$vy process

  • Lee, Oe-Sook
    • Journal of the Korean Data and Information Science Society
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    • v.21 no.6
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    • pp.1311-1317
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    • 2010
  • A continuous time asymmetric power GARCH(1,1) model is suggested, based on a single background driving L$\'{e}$vy process. The stochastic differential equation for the given process is derived and the strict stationarity and kth order moment conditions are examined.

Continuous Migration Container System for Upgrading Object

  • Yoosanthiah, N.;Khunkitti, A.
    • 제어로봇시스템학회:학술대회논문집
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    • pp.960-964
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    • 2004
  • During system resource improvement process that based on Object-Oriented technology could be affect to the continuous system performance if lack appropriate management and control objects mechanism. This paper proposes a methodology to support continuous system performance and its stability. The adoption is based on Java Container Framework and Collections Framework for object collection. Also includes Software Engineering, Object Migration and Multiple Class Loaders mechanism accommodate to construct Continuous Migration Container (CMC). CMC is a runtime environment provides interfaces for management and control to support upgrading object process. Upgrade object methodology of CMC can be divided into two phase are object equivalence checking and object migration process. Object equivalence checking include object behavior verification and functional conformance verification before object migration process. In addition, CMC use Multiple Class Loaders mechanism to support reload effected classes instead of state transfer in migration process while upgrading object. These operations are crucial for system stability and enhancement efficiency.

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Uniform Ergodicity of an Exponential Continuous Time GARCH(p,q) Model

  • Lee, Oe-Sook
    • Communications for Statistical Applications and Methods
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    • v.19 no.5
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    • pp.639-646
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    • 2012
  • The exponential continuous time GARCH(p,q) model for financial assets suggested by Haug and Czado (2007) is considered, where the log volatility process is driven by a general L$\acute{e}$vy process and the price process is then obtained by using the same L$\acute{e}$vy process as driving noise. Uniform ergodicity and ${\beta}$-mixing property of the log volatility process is obtained by adopting an extended generator and drift condition.

A study on the fabrication method of middle size LGP using continuous micro-lenses made by LIGA reflow

  • Kim, Jong-Sun;Ko, Young-Bae;Hwang, Chul-Jin;Kim, Jong-Deok;Yoon, Kyung-Hwan
    • Korea-Australia Rheology Journal
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    • v.19 no.3
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    • pp.171-176
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    • 2007
  • LCD-BLU (Liquid Crystal Display-Back Light Unit) of medium size is usually manufactured by forming numerous dots with $50{\sim}300\;{\mu}m$ in diameter by etching process and V-grove shape with $50\;{\mu}m$ in height by mechanical cutting process. However, the surface of the etched dots is very rough due to the characteristics of the etching process and V-cutting needs rather high cost. Instead of existing optical pattern made by etching and mechanical cutting, 3-dimensional continuous micro-lens of $200\;{\mu}m$ in diameter was applied in the present study. The continuous micro-lens pattern fabricated by modified LIGA with thermal reflow process was tested to this new optical design of LGP. The manufacturing process using LIGA-reflow is made up of three stages as follows: (i) the stage of lithography, (ii) the stage of thermal reflow process and (iii) the stage of electroplating. The continuous micro-lens patterned LGP was fabricated with injection molding and its test results showed the possibility of commercial use in the future.