• 대한기계학회논문집B
• /
• 제24권5호
• /
• pp.733-743
• /
• 2000

We solve the integral representation of the Navier-Stokes equations in a lagrangian view by tracking the particles, which have vortex strengths. We simulate the unsteady viscous flow around an impulsively started cylinder using the vortex particle method. Particles are advanced via the Biot-Savart law for a lagrangian evolution of particles. The particle strength is modified based on the scheme of particle strength exchange. The solid boundary satisfies the no-slip boundary condition by the vorticity generation algorithm. We newly modify the diffusion scheme and the boundary condition for simulating an unsteady flow efficiently. To save the computation time, we propose the mixed scheme of particle strength exchange and core expansion. We also use a lot of panels to ignore the curvature of the cylinder, and not to solve the evaluation of the surface density. Results are compared to those from other theoretical and experimental works.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2000년도 추계학술대회 논문집
• /
• pp.351-354
• /
• 2000

AC impedance of LiM $n_2$ $O_4$ and LiM $g_{0.1}$M $n_{1.9}$ $O_4$ samples have been studied at various temperature with charge-discharge test. AC impedance of LiM $n_2$ $O_4$ measured at -2$0^{\circ}C$, room temperature and 5$0^{\circ}C$ revealed that initial impedance before charge-discharge test was gradually decreased and become small by becoming law temperature. It indicates that the Li ion diffusion and the transfer resistance of the cathode are related to the temperature of cycling. Impedance at high temperature was suddenly increased because Mn dissolution and decomposition of electrolyte had been increased during cycling, compared to impedance at low temperature. Therefore, charge-discharge capacity was suddenly decreased at high but was slowly at low. In LiM $g_{0.1}$M $n_{1.9}$ $O_4$, impedance and capacity were stability at room temperature than there at 5$0^{\circ}C$, too. Initial impedance at 5$0^{\circ}C$ before charge-discharge test was small and impedance was suddenly increased during cycling than that at room temperature.ure.ure.

• 한국정보통신학회논문지
• /
• 제12권8호
• /
• pp.1339-1348
• /
• 2008

전파통신의 보급과 이용의 확대의 따라 전파자원에 대한 수요가 급증하고 있기 때문에 전파통신의 효율적인 관리 및 이용을 위한 정책은 서비스의 보급 확산과 더불어 향후 이 분야의 기술발전을 위하여 지속적으로 연구되어야 할 과제이다. 따라서 본 논문에서는 전파진흥 정책의 여건변화, 전파자원 이용의 환경 변화 및 기술발전의 추세에 따라 체계적이고 효율적인 대처가 필요하기 때문에 국제협약, 국제회의 등에서 연구 채택된 관련 규정의 개정 및 쟁점사항들을 분석 검토하고, 이를 기본으로 전파관리 정책 및 제도와 연계하여 국내 전파법령에 적시에 도입할 수 있는 방안을 모색하고 이를 통하여 제 개정의 근거를 마련하고자 한다.

• International Journal of Contents
• /
• 제14권4호
• /
• pp.10-17
• /
• 2018

China media environment has drastically changed leading to the an inevitable change of public opinion ecology. Empirical studies have focused less on public opinion guidance, which forms an important component of the government officials' media literacy. This study applied quantitative method in the investigation of media literacy in China. Ideally, media literacy is measured from media cognition, media contact, media usage under the view of public opinion guidance. The findings reveal that the existing problem on 1) incorrect media cognition and public opinion guidance; 2) insufficient contact of personal social media 3) improper tendencies in the use of media to guide the public opinion, especially, on confidential information. Consequently, in order to improve media literacy in China government officials, enhancement of their basic knowledge on news diffusion and public opinion is necessary. Secondly, to effectively deal with "agenda settings", it is important for the government to consider the provision of valuable information and platforms to effectively spread information. So they need to learn how to personally and officially use social media platforms such as Weiboa and Wechat. This ensures they have maximized their potential to acquire valuable information and spread them on valuable platforms. Thirdly, government officials should be able to analyze and understand public opinion trends for official and personal use. Finally, they should understand the development of public opinion and the how online public opinion laws are formed and the target group.

• International Journal of Advanced Culture Technology
• /
• 제6권4호
• /
• pp.172-178
• /
• 2018

In this paper, I tried to pursue health and social welfare together through medical convergence based on the main subject of a culture of convergence. Artists' drug accidents are never ending. Now Korea is also out of the drug cleansing country. it is impossible to get rid of them with the national public power. It is time for a treatment plan for these. They need a certain period of time and regular periods of rest and control over sports. Our humanities are researching to understand the changing human images of today. In parallel, medical convergence will also have to be transformed in various ways for human healing. Recently, we can see the case of healing with the combination of oriental medicine, natural healing and western medicine. Furthermore, the structure of medical convergence for the fight against disease can be analyzed as an example. South Korea is also preparing for various convergence programs focusing on natural sciences such as engineering, medical care, and the environment. In order to prevent drug addiction it is important to determine the department responsible for handling the problem of substance abuse. we need to improve the environment that they can be combined with Ondol therapy and natural healing therapies. Furthermore, I expect that fusion medicine will contribute to improving the quality of life of drug addicts and become a successful model to revitalize local economies in particular.

• The Journal of Asian Finance, Economics and Business
• /
• 제8권2호
• /
• pp.151-164
• /
• 2021

The paper identifies the enablers (drivers) and inhibitors (barriers) influencing e-customs implementation in Vietnam (known as a developing country with a lower technological environment) along with determining the impact of e-customs on firm performance. The survey was conducted with the representatives (managers) of firms in five cities and provinces dominating Vietnam's international trade. The data was analyzed using structural equation modeling (SEM). The findings show two significant drivers (enablers) - relative advantages and national culture, while compatibility and ease of use are the barriers. Previous studies showed that cultural dimensions related to 'uncertainty acceptance' and 'individualism' encourage innovation; however, this paper demonstrates that 'uncertainty avoidance' and 'collectivism' promote e-customs deployment in Vietnam. Previously, Vietnamese culture was known for scoring high on cultural dimensions related to 'power distance' and 'short-term orientation'. However, today, as an emerging country, Vietnamese has switched to 'low distance' and 'long-term orientation', especially in terms of e-customs innovation. Additionally, the paper also emphasized that e-customs implementation had a positive influence on firm performance in Vietnam. Based on the results of the paper, policy-makers can devise essential solutions to enhance e-customs implementation as well as managers of firms can set-up strategies to adapt to the modernized environment.

• 한국항해항만학회지
• /
• 제46권2호
• /
• pp.134-144
• /
• 2022

The development and operation of autonomous ships are spotlighted as a next-generation technology that will provide newbenefits for the maritime business during the fourth industrial revolution. To expand the adoption of autonomous ships, the much more interest of the nation and the industries will have to be changed to actual adoption in shipping companies. For this, it is judged that research to identify the factors impacting the adoption intention of autonomous ships should be preceded. However, most studies on autonomous ships have focused on developing the technology, revising the law, establishing policies, and managing human resources, with few studies on influencing factors in the adoption of autonomous ships. A model, to identify the factors that impact the intention to the adoption of autonomous ships, based on the theory of diffusion of innovation and the TOE framework was developed. The suggested model was verified through empirical analysis targeting the shipping companies and the marine industries in Korea. As the result of this study, it was found that top management support, financial slack, and competitive intensity significantly impacted the intention to adopt autonomous ships. Additionally, it was revealed that the overall awareness of autonomous ships among Korean shipping companies is poor.

• 한국재료학회지
• /
• 제34권3호
• /
• pp.163-169
• /
• 2024

As the limitations of Moore's Law become evident, there has been growing interest in advanced packaging technologies. Among various 3D packaging techniques, Cu-SiO₂ hybrid bonding has gained attention in heterogeneous devices. However, certain issues, such as its high-temperature processing conditions and copper oxidation, can affect electrical properties and mechanical reliability. Therefore, we studied depositing only a heterometal on top of the Cu in Cu-SiO₂ composite substrates to prevent copper surface oxidation and to lower bonding process temperature. The heterometal needs to be deposited as an ultra-thin layer of less than 10 nm, for copper diffusion. We established the process conditions for depositing a Co film using a Co(EtCp)₂ precursor and utilizing plasma-enhanced atomic layer deposition (PEALD), which allows for precise atomic level thickness control. In addition, we attempted to use a growth inhibitor by growing a self-assembled monolayer (SAM) material, octadecyltrichlorosilane (ODTS), on a SiO₂ substrate to selectively suppress the growth of Co film. We compared the growth behavior of the Co film under various PEALD process conditions and examined their selectivity based on the ODTS growth time.

• 한국컴퓨터정보학회논문지
• /
• 제18권2호
• /
• pp.149-156
• /
• 2013

이 논문에서는 헌법재판소의 판결을 통하여 SNS를 통한 선거운동의 자유가 사실상 보장되었음에도 불구하고, 아직도 많은 부분 공직선거법상에서 선거운동의 자유를 제약하는 규정이 존재하여 이것이 앞으로의 선거에서 많은 법적인 문제를 야기할 가능성이 농후하다. 더욱이 그동안의 선거운동과는 차원이 다른 SNS를 통한 선거운동의 과정에서, 무한확산의 가능성이 어느 시점보다 높아지고 있는 시점에서 SNS를 통한 선거운동의 자유와 공직선거법상 허위사실유포의 한계와 관련하여 많은 문제가 발생할 가능성이 높다. 이에 그동안의 공직선거법상 허위사실 유포죄는 유포한 사실이 허위일 뿐만 아니라. 그 유포를 통하여 특정인을 낙선시키려는 목적이 있어야 성립하는 범죄로 규정되어 있음에도 이에 대한 엄격하게 해석하기 보다, 유포된 사실이 허위인가에 대하여 판단하는 형태로 법원의 판단이 이루어져 왔다. 따라서 이 법을 개정 또는 삭제하기 전에 엄격한 해석의 필요성에 대하여 논의하고자 하였다. 입법론상 폐지하는 것이 바람직하지만, 우선 해석학을 통하여 문제점을 지적하였다. 첫째, 보호법익을 본죄의 취지 맞게 제한적으로 해석하고자 하였다. 둘째, 본죄가 목적범이기 때문에 목적범에서 목적은 본죄의 경우 엄격하게 해석할 필요성을 주장하였다. 왜나하면 인터넷 공간에서 이른바 리트윗의 경우에는 팔로워들이 별 의미없이 행해지는 경우도 많을 것이기 때문에 본죄로 처벌하는데 한계가 있을 것이 분명하다. 그리고 모처럼 헌법재판소에서 SNS를 통한 선거운동의 자유를 보장하고 있는 만큼, 우리나라에서 선거의 자유로운 소통의 장을 열어주는 의미에서도 제한적 해석은 필요하다. 이는 표현의 자유를 높게 보장하게 될 것이고 이는 성숙한 시민사회로 가는 첩경이 될 것이기 때문이다.

• 중소기업연구
• /
• 제32권1호
• /
• pp.65-87
• /
• 2010

본 연구의 목적은 기술혁신형중소기업(이노비즈)의 건전한 성장발전을 위하여 기업의 중요한 전략적 자원으로 인식되고 있는 기술혁신능력과 기술사업화능력이 시장정보지향성을 매개로 경영성과에 미치는 영향을 분석하여 기술혁신형중소기업의 효율적인 경영관리와 정부의 정책방향에 시사점을 제공하고자 하는데 있다. 이러한 목적을 달성하기 위하여 우리나라 기술혁신형 중소기업를 대상으로 오슬로매뉴얼과 선행연구를 토대로 연구개발능력, 기술축적능력, 기술혁신체제를 기술혁신능력으로, 제품화능력, 생산화능력, 마케팅능력을 기술사업화능력으로 구성하고, 이들 요인들이 시장정보지향성을 매개 변수로 경영성과에 미치는 영향을 실증분석을 통하여 검증하였다. 연구결과에 의하면, 제품경쟁력 향상과 같은 기술의 상업적 성과와 직접적인 관련이 있는 경영성과는 기술혁신체제나 생산화능력, 마케팅능력 등의 경영관리적 측면에서의 능력이 상대적으로 큰 영향을 미치며 기술적 성과를 의미하는 신기술/신제품개발 성과는 연구개발능력, 기술축적능력, 제품화능력 등 공학적 측면에서의 능력이 상대적으로 큰 영향을 미친다는 것을 보여 주었다. 또한 시장정보지향성과 관련하여 신기술/신제품개발 등의 기술적 성공을 위해서는 조직내부에서의 정보확산 수준이 상대적으로 크게 부각되고 있고, 제품경쟁력 향상 등 상업적 성공을 이루기 위해서는 정보에 대한 반응수준이 더 크게 요구된다는 점을 함축하고 있다.