• Title/Summary/Keyword: Defy

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Deciphering Open Source Innovation Process with Implications for Technology Policy -Comparative Case Study- (오픈 소스 기술혁신 과정의 기술정책적 함의 -비교 사례분석-)

  • Han, Yoon-Hwan
    • Journal of Korea Technology Innovation Society
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    • v.7 no.1
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    • pp.1-20
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    • 2004
  • In this paper, we try to explore the nature of open source software development process. The process involves peculiar characteristics which seem to defy the traditional economic reasoning for technology policy. Based upon the comparative case study of open source software development process with the two innovation processes adopted from literature on economic history, we argue that technology policy should strike the balance between provision of innovation incentives and voluntary disclosure of information.

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BASE DRAG PREDICTION OF A SUPERSONIC MISSILE USING CFD (CFD를 이용한 초음속 유도탄 기저항력 예측)

  • Lee Bok-Jik
    • Journal of computational fluids engineering
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    • v.11 no.3 s.34
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    • pp.59-63
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    • 2006
  • Accurate prediction of a supersonic missile base drag continues to defy even well-rounded CFD codes. In an effort to address the accuracy and predictability of the base drags, the influence of grid system and competitive turbulence models on the base drag is analyzed. Characteristics of some turbulence models is reviewed through incompressible turbulent flow over a flat plate, and performance for the base drag prediction of several turbulence models such as Baldwin-Loman(B-L), Spalart-Allmaras(S-A), k-$\varepsilon$, k-$\omega$ model is assessed. When compressibility correction is injected into the S-A model, prediction accuracy of the base drag is enhanced. The NSWC wind tunnel test data are utilized for comparison of CFD and semi-empirical codes on the accuracy of base drag predictability: they are about equal, but CFD tends to perform better. It is also found that, as angle of attack of a missile with control fins increases, even the best CFD analysis tool we have lacks the accuracy needed for the base drag prediction.

The Differences of Strategic Choice and Performance between Early Mover and Followers on Cyber Market (가상시장에서 선발기업과 후발기업의 전략선택과 성과에 대한 연구 - 닷컴기업 중심으로 -)

  • Koo, Chul-Mo;Lee, Sang-Gun;Nam, Ki-Chan
    • Asia pacific journal of information systems
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    • v.13 no.4
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    • pp.29-47
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    • 2003
  • This research explores early mover advantages and performance in the cyber market based on an empirical test. It also examines whether early mover strategic capabilities are able to adopt mutually cumulative relationship in the cyber market. Early movers such as eBay.com and Amazon.com seem to have been able to defy exclusive relationship between strategic capabilities. Compared with their followers such as uBid.com and buy.com, they have been able to adopt strong focus, differentiation, and cost leadership strategies. The purpose of this paper is to investigate the differences in strategic choices based on the strategic capabilities and performance of online firms between early movers and followers. The study reviews early mover advantages and disadvantages, and a strategic typology based on Porter's model, as well as strategic capabilities based on the sand cone model.

Evaluation of Riverine Microbial Diversity using the Culture-Independent Genetic Fingerprinting Technique (T-RFLP) (유전자지문분석법(T-RFLP)을 이용한 하천 미생물의 다양성 평가)

  • Jeong, Ju-Yong;Lee, Kyong-Hee
    • Journal of Korean Society on Water Environment
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    • v.24 no.2
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    • pp.195-200
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    • 2008
  • To analyze the riverine microbial community structure, genetic fingerprints and ecological indexes such as species abundances, diversity, evenness, dominance of targeted rivers in Gyeonggi Province were acquired and evaluated using terminal restriction fragment length polymorphism (T-RFLP) technique. Genetic fingerprinting technique such as T-RFLP, which is able to show the microbial community clearly unlike traditional culture-dependent techniques, was thought to be useful to analyse the riverine microbial ecosystem under various factors. Riverine ecosystem evaluation using visible organisms would give biased results with time, targeted organism and researcher. But, T-RFLP, which can exclude the subjected biases such as culture condition and identification, would be an option to understand natural ecosystem by including the microorganisms that defy culture but perform important functions.

Reverse-Simulation Method for Single Run Simulation Optimization (단일 실행 시뮬레이션 최적화를 위한 Reverse-Simulation 기법)

  • 이영해
    • Journal of the Korea Society for Simulation
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    • v.5 no.2
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    • pp.85-93
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    • 1996
  • Simulation is commonly used to find the best values of decision variables for problems which defy analytical solutions. This objective is similar to that of optimization problems and thus, mathematical programming techniques may be applied to simulation. However, the application of mathematical programming techniques, e.g., the gradient methods, to simulation is compounded by the random nature of simulation responses and by the complexity of the statistical issues involved. In this paper, therefore, we explain the Reverse-Simulation method to optimize a simulation model in a single simulation run. First, we point the problem of the previous Reverse-Simulation method. Secondly, we propose the new algorithm to solve the previous method and show the efficiency of the proposed algorithm.

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Reverse-Simulation 기법에 의한 다수 평가 함수를 가진 시스템의 최적화

  • 박경종
    • Proceedings of the Korea Society for Simulation Conference
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    • 1997.04a
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    • pp.3-7
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    • 1997
  • Simulation is commonly used to find the best values of decision variables for problems which defy analytical solutions. "Simulation Optimization" technique is used to optimize the expressed in analytical of mathematical models. In this research, we will study Reverse-Simulation optimization method which is quite different from current simulation optimization methods in literature. We will focus on the on-line determination of steady-state method which is very important issue in Reverse-Simulation optimization, and the construction of Reverse-Simulation algorithm with expert systems. Especially, in the case of multiple objectives because of the dependency of simulation model, all objectives do not satisfied simulataneously. In this paper, therefore, we process simulation optimization using objectives with priority to optimize multiple objectives under single run.ingle run.

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Narratological diversion coupled with moral vagueness in Conrad's Heart of Darkness

  • Lee, Seogkwang
    • English & American cultural studies
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    • v.14 no.1
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    • pp.117-139
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    • 2014
  • This paper examines the moral vagueness penetrating Heart of Darkness. It views that the inarticulate moral presentation in the book is caused by the way in which the author distracts Marlow throughout his journey to Congo and ultimately to Kurtz, and puts him in a distance from what the real Cong is. Also Conrad's peculiar narrative style leads the readers' view astray Marlow describes what he sees and delivers the impression he gains in the journey but all he gets seems to be merely hazy and nebulous the readers are left with suspicion about his reliability on what he conveys to them. The effect is, because of the meagre tangibility on what Marlow experiences, he does not seem to get a clear grip on his moral rumination on what Congo can emit and what Kurtz ended up with, which allows the novel to defy a moral absoluteness. The moral awakening Marlow has gone through remains obscure. The readers are simply invited to work out what Marlow is up to.

A Study on the Design Concept of Interior space in Korean Traditional Houses (조선시대 상류주택 실내공간의 디자인 개념에 관한 연구)

  • 오혜경
    • Korean Institute of Interior Design Journal
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    • no.13
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    • pp.3-10
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    • 1997
  • The purpose of this study was to identify the design concepts embedded in our traditional interior space. The majority of this research was achieved through literature review as well as examining traditional Korean houses. The major findings were summarized as follows : First, traditional Korean interior space is contemplative. This is created possible by the careful placement of indispensable furnitures and accessaries resulting in an abundance of unoccupied space. Therefore, the room assumes a peaceful atmosphere which calms the mind and creates a tranquil setting. To enjoy the placidity of Korean interior space a humble demeanor and contemplative thought are required. Next, traditional Korean interior space is modest. This is created by the moderate proportions that do not challenge human scale. Traditional Korean interior space does not dominate its surroundings but rather conforms with them. This contrasts with traditional western houses which utilizes an overbearing scale sacrificing intimate space. Thirdly, traditional Korean interior space is raw. In other words, the materials used in house retain their self-evident natural state and are not artifically manipulated to hide their inherent properties. The fundamental conceptual belief that interior space should not defy nature but instead become part of it. Lastly, traditional Korean interior space is not decorative Rooms are not congested with frivolous aesthetics. Although this does not immediately attract the people's attention, eventually the interior space establishes a unique line of communication with them.

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The Nature and Extent of Nominal and Real Wage Flexibility in Korea (한국의 명목 및 실질임금의 유연성 정도와 성격에 대하여)

  • Park, Seonyoung;Shin, Donggyun
    • Journal of Labour Economics
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    • v.37 no.2
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    • pp.1-47
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    • 2014
  • Longitudinal analysis of individual wage data received from the Korea Labor and Income Panel Survey (KLIPS) for the 1998-2012 period reveals that nominal wage reductions are prevailing among job stayers. It is also found that the probability of nominal wage cut is higher in the period of lower inflation or higher unemployment, and affected by various individual or group characteristics. Additional analysis of two establishment-based average wage series and the KLIPS shows that real wages are substantially procyclical, which is attributed to the strong procyclicality of nominal wages rather than countercyclicality of inflation. Current findings defy wage-rigidity-based explanations of unemployment fluctuations or models that predict wage rigidity, inlcluding segmented labor market hypotheses.

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Uncertainties In Base Drag Prediction of A Supersonic Missile (초음속 유도탄 기저항력 예측의 불확실성)

  • Ahn H. K.;Hong S. K.;Lee B. J.;Ahn C. S.
    • 한국전산유체공학회:학술대회논문집
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    • 2004.10a
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    • pp.47-51
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    • 2004
  • Accurate Prediction of a supersonic missile base drag continues to defy even well-rounded CFD codes. In an effort to address the accuracy and predictability of the base drags, the influence of grid system and competitive turbulence models on the base drag is analyzed. Characteristics of some turbulence models is reviewed through incompressible turbulent flow over a flat plate, and performance for the base drag prediction of several turbulence models such as Baldwin-Lomax(B-L), Spalart-Allmaras(S-A), $\kappa-\epsilon$, $\kappa-\omega$ model is assessed. When compressibility correction is injected into the S-A model, prediction accuracy of the base drag is enhanced. The NSWC wind tunnel test data are utilized for comparison of CFD and semi-empirical codes on the accuracy of base drag predictability: they are about equal, but CFD tends to perform better. It is also found that, as angle of attack of a missile with control (ins increases, even the best CFD analysis tool we have lacks the accuracy needed for the base drag prediction.

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