• Title/Summary/Keyword: 과학확산

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Diffusion of Innovations for Bio-technology Ventures (생명공학 혁신의 시장확산 -Venture 기업을 중심으로-)

  • Lee, Kyu-Hyun
    • Journal of Global Scholars of Marketing Science
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    • v.8
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    • pp.515-535
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    • 2001
  • This paper begins with investigation of the race to unlock human DNA, and investigates the emergent areas of bio-technological innovations. This paper draws upon basic ideas from the research traditions of the diffusion of innovations in the competitive situations. To achieve the succesful diffusion of bio-technological innovations, following issues are suggested; clusters, alliances competence, core competence, consumer resistance, chasm phenomena, qualitative research, social network, and cross-culture. The better understanding of the diffusion of bio-tech innovations with empirical studies can complement research on the diffusion of bio-technological innovations and help in the development of a universal model for diffusion of high technological innovations.

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Measurement of Substance Diffusion on a Bio-body Surface Using Laser Plasma Spectroscopy (생체 표면에서의 물질 확산 측정을 위한 레이저 플라즈마 분광법 적용)

  • Yoon, Sangwoo;Oh, Jiheon;Park, Seongyong;Jung, Jaekyeong;Kim, Joohan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.7
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    • pp.71-76
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    • 2019
  • The diffusion of the drug component of the inflammatory patch into the living tissue was analyzed by laser induced plasma spectroscopy (LIBS). Calcium element, which is a diffusion catalyst of the drug in the inflammatory analgesic patch, is transferred into the body through the diffusion process of the substance. The test pieces used in the experiment are pig skin tissues which are similar to human skin. As a result, the diffusion coefficient D of the calcium element was found to be average $8.24{\times}10^{-2}({\mu}m^2/s)$. Experimental results showed that the most influential factors on the diffusion of materials were temperature variables.

Analysis tool for the diffusion model using GPU: SNUDM-G (GPU를 이용한 확산모형 분석 도구: SNUDM-G)

  • Lee, Dajung;Lee, Hyosun;Koh, Sungryong
    • Korean Journal of Cognitive Science
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    • v.33 no.3
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    • pp.155-168
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    • 2022
  • In this paper, we introduce the SNUDM-G, a diffusion model analysis tool with improved computational speed. Although the diffusion model has been applied to explain various cognitive tasks, its use was limited due to computational difficulties. In particular, SNUDM(Koh et al., 2020), one of the diffusion model analysis tools, has a disadvantage in terms of processing speed because it sequentially generates 20,000 data when approximating the diffusion process. To overcome this limitation, we propose to use graphic processing units(GPU) in the process of approximating the diffusion process with a random walk process. Since 20,000 data can be generated in parallel using the graphic processing units, the estimation speed can be increased compared to generating data through sequential processing. As a result of analyzing the data of Experiment 1 by Ratcliff et al. (2004) and recovering the parameters with SNUDM-G using GPU and SNUDM using CPU, SNUDM-G estimated slightly higher values for certain parameters than SNUDM. However, in term of computational speed, SNUDM-G estimated the parameters much faster than SNUDM. This result shows that a more efficient diffusion model analysis for various cognitive tasks is possible using this tool and further suggests that the processing speed of various cognitive models can be improved by using graphic processing units in the future.

Analysis of Counter-diffusion of Aromatic Compounds on Alumina by Spectrophotometry (알루미나에서 방향족화합물의 분광광도법에 의한 역확산 해석)

  • Ko, Tae-Seog;Chung, Kyeong-Hwan
    • Analytical Science and Technology
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    • v.8 no.2
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    • pp.205-213
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    • 1995
  • Counter-diffusion of coronene desorbed from alumina with addition of tetra-phenylporphine was studied by spectrophotometry. The counter-diffusion processes of adsorbing and desorbing materials in liquid phase were simulated by counter-diffusion model based on Fritz's binary component isotherm under an assumption of equimass diffusion. The counter-diffusivities of desorbed coronene with addition of tetra-phenylporphine were as ${\sim}10^{-15}m^2/sec$ and that of adsorbed tetra-phenylporphine as ${\sim}10^{-11}m^2/sec$. The counter-diffusivity of coronene determined from desorption process was smaller by ${\sim}10^5$ times than the diffusivity determined from adsorption process of a single species. The reduction of the determined counter-diffusivity of coronene in desorption process was explained by the cross of diffusion fluxes and build-up of high gradient of coronene in pore.

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Dispersal Pattern of the Black Pine Bast Scale, Matsucoccus thunbergianae (Homoptera : Margarodidae), in Korea (솔껍질깍지벌레(Matsucoccus thunbergianae)의 확산(擴散) 유형(類型))

  • Chung, Yeong-Jin;Park, Young-Seuk;Chon, Tae-Soo;Shin, Sang-Chul;Park, Ji-Doo
    • Journal of Korean Society of Forest Science
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    • v.89 no.3
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    • pp.306-309
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    • 2000
  • The black pine bast scale (BPBS), Matsucoccus thunbergianae, causes serious damage to Japanese black pine forests in the southern part of Korean peninsula. After first detection of its damage in Kohung, Chonnam Province in 1963, the distribution has been expanding gradually year by year. Since 1983, extensive surveys for BPBS distributions have been carried out by Korea Forest Research Institute. We used cumulative data for BPBS distribution and analyzed the dispersal pattern. We divided expansions into three directions such as north along the west coast, northeast towards the inland, and east along the south coast. In the direction of northeast the dispersal rate was approximately 4.3km per year in dense forests of Japanese black pine, but it slowed down since the early 1990s. The annual dispersal rates were approximately 5.9 and 3.3km in north and east directions, respectively.

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