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Two-Photon-Resonant Three-Photon Ionization of Na Atom (Na 원자의 2광자 공명 3광자 이온화)

  • 이종훈;노시표;김중복;김기식;이종민
    • Korean Journal of Optics and Photonics
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    • v.1 no.1
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    • pp.1-6
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    • 1990
  • We studied two-photon-resonant three-photon ionization processes via 4D[channel #1] and 5S(channel #2] intermediate state of Na atom in a quartz ionization cell. For each channel. the bandwidth of ionization spectrum increased linearly with laser intensity and the ionization signal followed J3 dependence at low intensity. Compared with channel # 1 . ionization signal of channel #2 was enhanced by a factor of 20 - 25. The measured AC Stark shift factor of 3S - 4I) transition was $174\pm60MHz/MW/textrm{cm}^2$..

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Empirical Analysis of the Influence of ICT SMEs' R&D Resources on Corporate Performance (ICT 중소기업의 연구개발 자원이 기업성과에 미치는 영향에 관한 실증연구)

  • Jong Yoon Won;Kun Chang Lee
    • Information Systems Review
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    • v.23 no.3
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    • pp.1-23
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    • 2021
  • The national economic policy paradigm is constantly changing according to the global business environment. Among them, fostering SMEs is a core policy of many developed countries. The growth of SMEs contributes to the creation of jobs and the development of local communities in the era of employment-free growth. In particular, the growth of SMEs is the foundation for growth into mid-sized and large enterprises. Therefore, the growth of SMEs plays an important role in the national economy. Information and communication technology (ICT) became important much more with the emergence of the 4th industrial revolution. Among them, the growth of ICT SMEs is the nation's future asset. Therefore, this study examines and verifies the main factors affecting the performance of ICT SMEs from the view of their R&D resources. On the basis of 1,999 SMEs dataset, empirical analysis was performed to investigate the influence of R&D resources on their corporate performance. Its results are as follows. First, based on theresource-based theory, ICT SMEs' R&D investment, R&D manpower, and government support policies were found to have a positive effect on securing a company's competitive advantage. Second, it was found that the level of product has a positive effect on the company's performance. Finally, it was found that M&A and technology acquisition method strategies differ according to the growth stage of the company. Therefore, in order to achieve technological innovation and corporate performance of ICT SMEs, the government support policy and investment into internal R&D personnel play as main factors. In addition, it was found that technology acquisition strategies differ depending on the growth stage of the company.

A Case Study on Growth Through Coupled Process Open Innovation Open Innovation in the Faculty Startup Ecosystem: From the Perspective of Core Competency Theory (교원창업 생태계에서 결합형 오픈이노베이션을 통한 성장 사례 연구: 핵심역량이론 관점에서)

  • Changwon Yoon;Jeahong Park;Youngwoo Sohn;Youngjin Kim;Yeoungho Seo
    • Asia-Pacific Journal of Business Venturing and Entrepreneurship
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    • v.19 no.3
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    • pp.173-186
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    • 2024
  • This paper analyzes a case of successful faculty entrepreneurship through a coupled process of open innovation in a university context, using the core competency theory perspective. Initially, the current state of faculty entrepreneurship is examined, and the effects of interdisciplinary coupled processes of open innovation are explored, focusing on the case of 'Omotion Inc.,' a startup utilizing generative AI technology for hyper-realistic 3D virtual human experiences. The research methodology involves in-depth interviews with Omotion Inc.'s co-founders, technology commercialization professionals, and experts in the field, followed by analysis based on foundational theories. Applying the core competency theory, this paper scrutinizes the process of integrating diverse expertise and technologies from various academic disciplines. The analysis goes beyond the limitations of faculty entrepreneurship confined to a single technology-centric research domain. Instead, it explores the possibilities of enhancement and value creation through coupled processes, providing practical implications for the university entrepreneurial ecosystem. The aim is to extend the traditional roles of education and research within the university, presenting a role in economic value creation beyond the boundaries of conventional faculty entrepreneurship. Through the collaboration of two faculty members, this study showcases the creation of novel technology and business models. It establishes that successful coupled processes of open innovation in faculty entrepreneurship, from a core competency theory perspective, require the entrepreneurial firm to possess (1) entrepreneurial capabilities, (2) technological capabilities, and (3) networking capabilities. The implications of this research highlight the positive impact of coupled processes of open innovation in faculty entrepreneurship, as evidenced by the Omotion Inc. case, offering guidance on entrepreneurial directions for university members preparing for entrepreneurship.

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The Performance of Grant-type Government R&D Project: Focusing on SME's R&D (자유공모형 국가연구개발 과제의 특성 및 효과성 분석 : 중소기업 R&D를 중심으로)

  • Seulki Hong;Sung Joo Bae
    • Journal of Technology Innovation
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    • v.30 no.4
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    • pp.57-82
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    • 2022
  • As the strategy to support SMEs' innovation has shifted to induce market-oriented innovation, the Korean government increasingly invests in grant-type R&D projects proposed by SME firms. This study reveals the characteristics of grant-type R&D projects proposed by SME firms through a transition of national R&D strategy and demand-pull innovation perspectives. This study also examines the differences between grant-type R&D projects proposed by firms and R&D projects led by the government through logit-analysis and propensity score matching methods. As a result, we found that a national R&D project for SMEs yields better innovation performance when the project is proposed by a company than led by the government.

Ab-Initio Study of the Schottky Barrier in Two-Dimensional Lateral Heterostructures by Using Strain Engineering (인장변형에 따른 이차원 수평접합 쇼트키 장벽 제일원리 연구)

  • Hwang, Hwihyeon;Lee, Jaekwang
    • New Physics: Sae Mulli
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    • v.68 no.12
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    • pp.1288-1292
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    • 2018
  • Using density functional theory calculations, we study the Schottky barrier (SB) change in a two-dimensional (2D) lateral heterostructure consisting of semiconducting $2H-MoS_2$ and the ferromagnetic metal $2H-VS_2$ by applying a uniaxial tensile strain from 0% to 10%. We find that the SB for holes is much smaller than that for electrons and that SB height decreases monotonically under increasing tensile strain. In particular, we find that a critical strain where the spin-up SB for holes is abruptly reduced to zero exists near a strain of 8%, implying that only the spin-up holes are allowed to flow through the $MoS_2-VS_2$ lateral heterostructure. Our results provide fundamental information and can be utilized to guide the design of 2D lateral heterostructure-based novel rectifying devices by using strain engineering.

The Design of Microstrip Array Antenna Depend on Patch Size (패치크기에 의존하는 마이크로스트립 어레이 안테나 설계)

  • 고영혁;이종악;정의붕
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.16 no.11
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    • pp.1063-1070
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    • 1991
  • A microstrip array antenna are designed to depend on the size of rectangular microstrip patch for the relative current destribution to be 1:2:2:1 or 1:1:2:2:1:1 using Tchebyscheff polynominals, and it consist of sharp beam pattern. Gain difference between the main lobe and sidelobe is calculated for theoritical values of 21.97 db or 29.54 db. The designed microstrip array antenna are measureed various characteristics, such as return loss, resonant frequency, radiation pattern, bandwidth, beamwidth, and agreed with each other and theoretical value. Also it is presented a process of phase variation of patch array antenna depend on relative current distribution for beam scanning.

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Three Dimensional Vibration Analysis of Thick, Circular and Annular Plates with Nonlinear Thickness Variation (비선형 두께 변분을 갖는 두꺼운 원형판과 환형판의 3차원적 진동해석)

  • 장승환;심현주;강재훈
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.17 no.2
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    • pp.119-129
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    • 2004
  • A three dimensional (3D) method of analysis is presented for determining the free vibration frequencies and mode shapes of thick, circular and annular plates with nonlinear thickness variation along the radial direction. Unlike conventional plate theories, which are mathematically two dimensional (2D), the present method is based upon the 3D dynamic equations of elasticity. Displacement components u/sub s/, u/sub z/, and u/sub θ/ in the radial, thickness, and circumferential directions, respectively, are taken to be sinusoidal in time, periodic in θ, and algebraic polynomials in the s and z directions. Potential (strain) and kinetic energies of the plates are formulated, and the Ritz method is used to solve the eigenvalue problem thus yielding upper bound values of the frequencies by minimizing the frequencies. As the degree of the polynomials is increased, frequencies converge to the exact values. Convergence to four digit exactitude is demonstrated for the first five frequencies of the plates. Numerical results we presented for completely free, annular and circular plates with uniform linear, and quadratic variations in thickness. Comparisons are also made between results obtained from the present 3D and previously published thin plate (2D) data.

A Study of Expression Visual Image in 2D Animation (2D애니메이션에서의 시각이미지표현에 관한 연구 -그레이브스의 명암이론을 중심으로-)

  • Kim, Kwang-Hwan
    • Cartoon and Animation Studies
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    • s.9
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    • pp.94-111
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    • 2005
  • Sight is one of the Important physical function of understand and express everyday life or artistic worts. 80% of the whole cognitive information on things and spaces comes from sight among man's five sense. This proves that the function of sight has much influence upon senses and perceptions, and such influence evokes a varier of emotional response. Emotion is an important element in framing an animation work, and need various equipment to evoke audience's impressions. Such elements as event, circumstance, time, and space are equipments for the emotional experience of audience.

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AE Count Rate and Crack Growth Rate under Low Cycle Fatigue Fracture Loading (저주기 피로 파괴 하중하에서 AE수 변화율과 균열성장율에 관한 연구)

  • 이강용
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.13 no.2
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    • pp.252-256
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    • 1989
  • In the low cycle fatigue fracture testing with KS(or JIS) SS41, crack growth rate, AE count rate and J-integral range are measured to get empirical relations between crack growth rate and J-integral range, AE count rate and J-integral range as well as AE count rate and crack growth rate. All the relations are shown to be linear on the log-log graphs. It is also shown that the linear relations can be formulated by using Dunegan's assumption and elastic-plastic fracture mechanics along with the well-known relation of crack growth rate and J-integral range. It is concluded that the differences between experimental and theoretical values are due to Dunegan's assumption.

On Depth Formula and Tor Game (깊이의 식과 토르 게임에 대하여)

  • Choi Sangki
    • Journal for History of Mathematics
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    • v.17 no.4
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    • pp.37-44
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    • 2004
  • Homological algebra has emerged and developed since 1950s. However, in 1890's Hilbert investigated the resolutions in his Syzygy Theorem which is a vital ingredient in homological algebra. In 1956 Serre has proved the finite global dimension of regular local rings. His result give a basic tool in homological algebra. This paper also deals with the depth formula that was raised by Auslander in 1961.

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