• Title/Summary/Keyword: Growth Theory

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Theory of Charged Clusters as New Understanding of Thin Film Growth

  • Hwang, Nong-Moon;Kim, Doh-Yeon
    • 한국정보디스플레이학회:학술대회논문집
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    • 2002.08a
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    • pp.147-152
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    • 2002
  • A new theory of thin film growth was suggested, where charged clusters of nanometer size are generated in the gas phase and are a major flux for thin films. The existence of these hypothetical clusters was experimentally confirmed in the diamond and silicon CVD processes as well as in metal evaporation. These results imply new insights as to the microstructure control of thin films. Based on this new understanding, the low temperature deposition of crystalline and amorphous silicon can be approached systematically.

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A Physically Based Dynamic Recrystallization Model for Predicting High Temperature Flow Stress (열간 유동응력 예측을 위한 물리식 기반 동적 재결정 모델)

  • Lee, H.W.;Kang, S.H.;Lee, Y.S.
    • Transactions of Materials Processing
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    • v.22 no.8
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    • pp.450-455
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    • 2013
  • In the current study, a new dynamic recrystallization model for predicting high temperature flow stress is developed based on a physical model and the mean field theory. In the model, the grain aggregate is assumed as a representative volume element to describe dynamic recrystallization. The flow stress and microstructure during dynamic recrystallization were calculated using three sub-models for work hardening, for nucleation and for growth. In the case of work hardening, a single parameter dislocation density model was used to calculate change of dislocation density and stress in the grains. For modeling nucleation, the nucleation criterion developed was based on the grain boundary bulge mechanism and a constant nucleation rate was assumed. Conventional rate theory was used for describing growth. The flow stress behavior of pure copper was investigated using the model and compared with experimental findings. Simulated results by cellular automata were used for validating the model.

The Nexus Between Monetary Policy and Economic Growth: Evidence from Vietnam

  • NGUYEN, Hoang Chung
    • The Journal of Asian Finance, Economics and Business
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    • v.9 no.1
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    • pp.153-166
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    • 2022
  • The study estimates the Structured VAR and the Dynamic Stochastic General Equilibrium Model for the Vietnamese economy based on the new Keynesian model for small and open economies, with the output gap, inflation, policy interest rate, the Vietnamese exchange rate, and the inflation and interest rate in the United States. The paper aims to clarify the impulse response of the macro variables through their shocks. It offers to model the SVAR and DSGE processes, as well as describe why and how interest rate policy is important in the impulse response of macro variables like the output gap and inflation process. The study supports the central role of monetary policy by giving empirical evidence for the new Keynesian theory, according to which an interest rate shock causes the output gap to widen and inflation to decrease. Finally, the application of the DSGE model is becoming more and more popular in the State Bank of Viet Nam to improve its policy planning, analyzing, and forecasting policy towards sustainable and stable growth.

Effect of Hexa-methylenetetramine (HMT) on Nucleation and Growth Behaviors of Ni(OH)2 Nanosheets Produced by Electrodeposition (전착법으로 제작한 Ni(OH)2 나노 시트의 핵 형성과 성장 거동에 미치는 헥사-메틸렌테트라민(HMT)의 영향)

  • Kim, Dong Yeon;Son, Injoon;Choi, Mun-Hyun
    • Journal of the Korean institute of surface engineering
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    • v.54 no.1
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    • pp.37-42
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    • 2021
  • Electrodeposition is a synthetic method that allows fine control of the nucleation and growth factors of metals and is a suitable method for studying the nucleation and growth of Ni(OH)2. Hexa-methylenetetramine (HMT) helps to form Ni(OH)2 nanosheets by increasing the OH- of the nickel precursor solution and helps to improve the electrochemical properties of the electrode. In this study, the structural properties of Ni(OH)2 nanosheets according to the HMT concentration change using electrodeposition were studied. As the concentration of HMT increased, the size and thickness of the Ni(OH)2 nanosheet adsorbed on the surface increased and porosity increased. Also, the Scharifker-Hills nucleation theory model and experimental data were compared. In conclusion, the nanosheet shape of the HMT 7.5 mM sample electrodeposited with -0.85 V vs. Ag/AgCl grew most uniformly, and the best result was obtained as an electrode material for a pseudocapacitor.

A Study on the Roles of Libraries for Societal Development (사회발전을 위한 도서관의 역할)

  • 박인웅
    • Journal of Korean Library and Information Science Society
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    • v.31 no.1
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    • pp.23-39
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    • 2000
  • This paper aims to demonstrate the theory of social cognition which librarianship have an effect on societal development. For these purpose, the stages of societal development is classified into three stages of economic growth, information sharing and self-actualization of individual and objectives of developments are investigated by stages. At last, the theory of social cognition which librarianship contribute to societal development are demonstrated with searching the roels of libraries corresponding to the objectives of development stages.

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Theory and technology of growing striation-free crystals

  • Scheel, Hans J.
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.14 no.4
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    • pp.174-186
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    • 2004
  • Striations are growth-induced inhomogeneities which hamper the applications of solid-solution crystals and of doped crystals in numerous technologies. Thus the optimized performance of solid solutions often can not be exploited. The inhomogeneity problem can be solved in specific cases by achieving a distribution coefficient one in growth from melts and from solutions. Macrostep-induced striations can be suppressed by controlling the growth mode, by achieving growth on facets thereby preventing step bunching. Thermal striations are commonly assumed to be caused by convective instabilities so that reduced convection by microgravity or by damping magnetic fields was and is widely attempted to reduce such inhomogeneities. Here it will be shown that temperature fluctuations at the growth interface cause striations, and that hydrodynamic fluctuations in a quasi-isothermal growth system do not cause striations. The theoretically derived conditions were experimentally established and allowed the growth of striation-free crystals of $KTa_{1-x}Nb_xO_3$"KTN" solid solutions. Hydrodynamic variations from the accelerated crucible rotation technique ACRT did not cause striations as long as the temperature was controlled within $0.03^{\circ}$ at $1200^{\circ}C$ growth temperature. Alternative approaches to solve or reduce the segregation and striation problems in growth from melts and from solutions are discussed as well.

The Short-run and Long-run Dynamics Between Liquidity and Real Output Growth: An Empirical Study in Indonesia

  • JUMONO, Sapto;SOFYAN, Joel Faruk;SUGIYANTO, Sugiyanto;MALA, Chajar Matari Fath
    • The Journal of Asian Finance, Economics and Business
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    • v.8 no.5
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    • pp.595-605
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    • 2021
  • The objectives of this research are to see if the phenomena of "demand following" and "supply leading" exist in the business cycle, as well as to look at how liquidity and output react to changes in credit risk, investment-saving gap, inflation, exchange rate, and growth rate of real national output. Employing quarterly data of Maluku and North Maluku (2008-2019), this study utilizes VAR/VECM for inferential analysis. This research found three important findings. First, liquidity and output growth influenced each other in the long run. Second, the determinants of output growth for Maluku are liquidity, investment-saving gap, and inflation, while the determinants of liquidity are output-growth, the gap of investment-saving, and inflation. Third, the determinants of output growth for North Maluku are liquidity, credit risk, investment-saving gap, inflation, exchange rate, and the national output-growth, while the determinants of liquidity are output-growth, credit risk, investment-saving gap, inflation, exchange rate, and national output-growth. The findings of this study supported the hypothesis of demand following and supply leading theory in the Maluku and North Maluku business cycles. This study concludes that economic development would improve if supported by liquidity adequacy through increased deposit growth.

Challenges and Growth in Convergence Research: A Grounded Theory Qualitative Analysis of Researchers' Experience and Perception (융합연구에서의 도전과 성장: 연구자의 경험과 인식에 대한 근거이론 질적 분석)

  • Song, In Han;You, Jung Won;Lee, Eun Jung;Kim, Ji Eun
    • Journal of the Korea Convergence Society
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    • v.8 no.8
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    • pp.267-281
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    • 2017
  • Despite the recent importance of interdisciplinary convergence research, little has been studied on the detailed experience while conducting convergence research in Korea. To deeper understand challenges and overcoming in convergence research and to suggest an administrative system for it, by analyzing researchers experience and cognition while conducting their actual convergence research, in-depth interviews with 16 full-time faculty members with expertise in convergence research and research administration in a university and analyzed the interviews by using the paradigm model of grounded theory. The results show that the core phenomenon researchers experienced is that "convergence research is not being effectively conducted," and they experience growth in research through pursuing efforts and improving research atmosphere in various aspects. Based on these findings, we made several suggestions for promoting convergence research.

A Comparative Study of Child-birth Gods in Korea and Japan (한일(韓日) 산육신(産育神) 비교 연구)

  • Kim, Nan-Ju
    • Cross-Cultural Studies
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    • v.39
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    • pp.127-152
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    • 2015
  • This thesis comparatively looks into folklore faiths, expecially child-birth gods related to child-birth customs and aims to find out both nations' faith in child-birth gods and their features. It looks into birth gods protecting delivering mothers and babies by appearing at the delivery sites at time of delivery and child-rearing gods intervening in growth of babies after they are born. In both nations, many gods are believed in for selection of babies, safe delivery and their healthy growth but those appearing at delivery sites are only birth goddesses called Samsinhalmony and Obugami. What make this phenomenon appear in both nations' folklore faiths? Seeing the reason in the fact that common negative concept regarding childbirth exists in both nations' established faiths, the writer comparatively analyzed various cases of delivery-related defilement in both nations' delivery customs. Its result showed that Japan is stronger in delivery-related defilement concept than Korea is. For instance, Japan regard child birth-related defilement more horrible than that related to funeral. Pursuantly, in Japan stricter regulations on childbirth rooms and stricter taboos for babies have been passed down. Besides, in the process of its comparative study on both nations' divine images and appearances, the writer paid attention to the fact that unlike Japan's mountain gods and restroom goddesses appearing at delivery sites, they don't get involved in childbirth in Korea and discussed Japan's theory of reincarnation and its mountain goddess' marginal nature working behind the curtain. I also discussed the phenomenon that both nations' childbirth gods are passed down as Three gods, which means that their faith in childbirth gods has to be seen as a result of the faith in childbirth gods interacting with the faith in Three gods or the Three-gods theory, accordingly I indicated that it is worth re-consideration to see the Three-God Theory as the core of the faith in Samsinhalmoni. Lastly, though in both nations' childbirth faith underlies their fear for divine beings, the faith in childbirth gods, strongly coupled with death heritages, is distributed throughout the nation, which is because Japan's childbirth gods intervening in birth and growth of a new life also actually involve themselves deeply in the sphere of death as well.

Personal Growth through Spousal Bereavement in Later Life (노년기 배우자 사별 후 적응과정에서의 개인적 성장)

  • Chang, Sujie
    • Korean Journal of Social Welfare
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    • v.65 no.4
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    • pp.165-193
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    • 2013
  • This study purposes to explore the growing process through spousal bereavement in later life, and to develop the theory. A qualitative research was conducted, and the participants were 17 seniors. The analysis according to Strauss and Corbin's grounded theory(1998), resulted in 143 concepts, 43 subcategories, and 19 categories. Range analysis according to paradigm showed that the causal conditions were 'marital relationships', 'independent/dependent tendencies', and 'emotional readiness for the death of a spouse', and the phenomena were 'depression', 'hopelessness', 'daily stress', 'psychological intimidation', 'regret', and 'sense of being freed'. The contextual conditions that affect these phenomena were 'desire for intimate personal relationships' and 'desire to maintain independence'; the action/interaction strategies to manage the phenomena were 'facing reality' and 'efforts for construction of the new life'; and the mediating conditions that promote or suppress these action/interaction strategies were 'social support' and 'spirituality'. The results were 'reconstruction of the meaning in life', 'increase in self-esteem', 'reinforcement of social network' and 'embrace and acceptance'. Furthermore, when personal growth after bereavement of a spouse was analyzed focusing on changes over time, the growth process consisted of three steps: 'sadness and despair', 'embracing and moving forward', and 'personal growth'. The pattern analyses were performed to typify recurring relations by category, and 5 types were derived. The results of our study show that personal growth after spousal loss is an integrative process in life after crisis, and can be conceptualized as the process of overcoming the despair that immediately follows the death of a spouse, seeking a new life by actively taking control, and discovering a strengthened self.

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