• 디지털콘텐츠학회 논문지
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• 제5권3호
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• pp.163-170
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• 2004

농업혁명, 산업혁명, 정보혁명과 맞먹는 제4의 혁명이 바로 유비쿼터스(Ubiquitous) 혁명이다. 과거의 농업혁명이나 산업혁명은 인류문명의 기반인 물리 공간의 혁명이었고, 월드와이드웹 서비스가 확대되면서 절정기를 맞은 정보화 혁명은 사이버 공간(Cyber Space)의 혁명이었다. 이에 반해 유비쿼터스 혁명은 물리 공간과 사이버 공간의 지능적 결합을 통한 온라인과 오프라인 공간이 통합된 공간에서 이뤄진다. 사이버 공간은 자연스럽게 생활공간과 결합되어 새로운 통합 공간을 창출한다. 그 공간은 아직까지 인류가 경험하지 못한 미지의 세계이자 무한한 기회 공간이다. 본 연구는 현재 진행 중인 유비쿼터스 기술의 개념과 현황 살펴본다. 또한 유비궈터스를 미용분야에 적용할 때의 문제점을 도출해보고 각 문제점을 해결할 수 있는 방안을 제시하였다. 특히 모든 기기간의 무선통신이 가능한 세상에서는 개인의 프라이버시에 대한 침해가 많이 발생할 소지가 많다. 이에 대한 정책적 기술적 해결방안을 제시함으로 향후 미용분야에 도래할 유비쿼터스 세상에 대한 철저한 준비에 유용한 자료가 될 것으로 사료된다.

• 호남수학학술지
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• 제38권1호
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• pp.151-167
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• 2016

In Minkowskian 3-spacetime $L^3$ we find timelike or spacelike surface of revolution for the given Gauss curvature K = -1, 0, 1 and mean curvature H = 0. In fact, we set up the surface of revolution with the time axis for z-axis to be able to draw those surfaces on standard pictures in Minkowskian 3-spacetime $L^3$.

• 한국컴퓨터정보학회논문지
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• 제26권1호
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• pp.253-258
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• 2021

본 연구에서는 소비자들의 개인정보보호태도와 인터넷 활동성이 4차 산업혁명 전망에 미치는 영향을 살펴보고, 나아가 개인정보보호태도와 4차 산업혁명 전망의 관계에서 인터넷 활동성의 조절효과를 탐색하였다. 연구데이터는 정보통신정책연구원에서 제공하는 2018년 한국미디어패널조사 자료를 이용하였다. 연구결과, 소비자들의 개인정보보호에 대한 우려는 4차 산업혁명 전망에 부정적이었으며, 높은 인터넷 활동성은 4차 산업혁명 전망에 긍정적인 영향을 미쳤다. 그리고 개인정보보호에 대한 우려가 4차 산업혁명 전망에 부정적인 영향을 미치지만 활발한 인터넷 활동성은 이를 완화시키거나 긍정적으로 전환시키는 것으로 나타났다. 본 연구는 4차 산업혁명에 당면한 경제구조 속에서 보다 적극적인 대응을 위한 기초자료로 기여할 것이다.

• 대한조선학회지
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• 제21권2호
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• pp.19-27
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• 1984

An extension of the finite element method to the stability analysis of shells of revolution under static axisymmetric loading is presented in this paper. A systematic procedure for the formulation of the problem is based upon the principle of virtual work. This procedure results in an eigenvalue problem. For solution, the shell of revolution is discretized into a series of conical frusta. The buckling mode in the circumferential direction is assumed, this assumption makes the problem economical for the computing time. The present method is applied to a number of shells of revolution, under axial compression or lateral pressure, and comparision are made with other theoretical results. The results show good agreement each other. The effects of aspect ratio, boundary conditions and buckling modes on the buckling strength of shells of revolution are studied. Also the optimum shape of cylindrical shell under uniform axial compression is obtained from the view point of structural stability.

• 대한수학회지
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• 제53권4호
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• pp.909-928
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• 2016

Chen and Ishikawa studied the surfaces of revolution of the polynomial and the rational kind of finite type in Euclidean 3-space $E^3$ [10]. Here, the pedal of revolution surfaces of the polynomial and the rational kind are discussed. Also, as a special case of general revolution surfaces, the sphere and catenoid are studied for the kind of finite type.

• 대한수학회보
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• 제50권4호
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• pp.1061-1067
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• 2013

In this paper, we study surfaces of revolution without parabolic points in 3-Euclidean space $\mathbb{R}^3$, satisfying the condition ${\Delta}^{II}G=f(G+C)$, where ${\Delta}^{II}$ is the Laplace operator with respect to the second fundamental form, $f$ is a smooth function on the surface and C is a constant vector. Our main results state that surfaces of revolution without parabolic points in $\mathbb{R}^3$ which satisfy the condition ${\Delta}^{II}G=fG$, coincide with surfaces of revolution with non-zero constant Gaussian curvature.

• 식품과학과 산업
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• 제50권2호
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• pp.60-73
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• 2017

Recently, the whole world is facing an unprecedented moment of opportunity, so-called The Fourth Industrial Revolution. As emphasized in the World Economic Forum held in January of 2016 at Davos, the Fourth Industrial Revolution is not merely a changes of technological devices. The fundamental of the revolution is new, innovative, and visionary business models which change the whole systems dramatically. One of the greatest challenges is to feed an expected population of 9 billion by 2050 in a impactful way. The system should be sustainable as well as beneficial in improving the lives of people in the food chain along with the ecological health of environment. The technological advances of the Fourth Industrial Revolution are expected to improve our food system. The smart farm technology such as precision planting and irrigation techniques will improve the yields of food materials. The smart food transportation and logistics systems will substantially improve the safety and human nutrition. The adaptation the Fourth Industrial Revolution technology will induce the smart supply chains, smart production, and smart products in food industry due to its flexibility and standardization. This will lead the manufactures to adapt to customers' changing product specifications and traceable services in a timely manner.

• 품질경영학회지
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• 제45권4호
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• pp.697-708
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• 2017

Purpose: The purpose of this study is to investigate the characteristics and limitations of various R&D processes. And to propose new R&D processes by analyzing the characteristics of the era of the fourth industrial revolution that will lead to innovative changes throughout the industry. Methods: Research method is to analyze the previous research on existing R&D process and draw out implications, and develop a new R&D process model that reflects characteristics of the fourth industrial revolution era. Results: This study analyzes the characteristics and situation of existing R&D process and derives the features of parallel structure and modularity suitable for the 4th industrial revolution era, characterized by super connectivity, super intelligence, super fusion. And propose a R&D process model that can respond flexibly and promptly to various market and customer needs. Conclusion: Suggestions for the development of R&D processes suitable for the fourth industrial revolution era will present new strategies and measures and provide diverse & innovative opportunities.

• 한국컴퓨터정보학회논문지
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• 제23권11호
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• pp.159-165
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• 2018

In this study, it is analyzed that keywords of the interest in the 4th industrial revolution for science and Technician K women's university students, areas to prioritize in the strategy of 4th industry revolution, to research compare analyze the recognition of science technology such as the most necessary education, human resource development of universities and companies in Korea and abroad according to the technology trend required in the 4th Industrial revolution era and which area to prepare for the 4th industrial revolution. The survey result shows different thoughts of science and Technician(KOFST) and the women university students. In the 1) 4th industrial revolution, the 96% of former are interested, while 60% of latter are interested. And in the most used keywords, the former group used AI(24%), Fusion new industry(21%) the most, while the latter group used AI(34%), Robot(18%). And, 3) in the strategic priority, the science technology experts are interested in education, R&D system innovation(27%), IoT, Information and Communication(26%) and the university students are interested in IoT, Information and Communication(31%), AI(28%). Finally, 4) the science technology experts thought of Autonomous Vehicle(20%), 3D Printer(7%), AI(16%) important, while the women university students thought of AI(27%), VR/Augmented Reality(17%), and Autonomous Vehicle(16%) the most necessary education. In the 4th industrial revolution, we need people with ability to solve complicated problems with creativity based on understanding and absorbing new knowledge and thinking of converged idea.

• 수산해양기술연구
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• 제22권1호
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• pp.29-33
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• 1986

This paper aims at finding out the optimum operating condition to reduce fuel consumption for the training ship Pusan 402 with controllable pitch propeller. For this purpose, this paper examints the variation of ship speed and fuel consumption in accordance with the change of engine revolution and propeller pitch. The results obtained are as follows: 1. When engine revolution is constant, the ship speed sluggishly increases according to the increase of propeller pitch but fuel consumption extremely increases. The higher revolution the engine is, the more remarkable this tendency is. 2. As the engine revolution becomes lower, the fuel consumption per mile decreases. Howt.er = the fuel consumption under the same engine revolution differs according to the propeller pitch. 3. Specific fuel consumption is uniformed about 180g/ps.h at any case of load. 4. Among the various operating conditions which yield the same ship speed, fuel consumption lowers in the case of lower engine revolution and larger propeller pitch.