• 보존과학연구
• /
• 통권6호
• /
• pp.247-258
• /
• 1985

Conservation laboratory was attached to Keimyung University Museum inMarch 1980 and ever since it has been devoted mainly to the processing andconservation of metal objects. A number of objects have been processed inthis laboratory during the period, including those already in the collection ofthe Museum, those which were discovered during the three major excavationsof Kaya tombs conducted by the Museum, and those processed on commissionfrom other museums in the country,The activities of this laboratory include: (1) conserving the objects againstfurther erosion; (2) raising the archaeological value of the objects by revealingthe structure of such parts of the objects as concealed under rust; and (3)recovering the original shape of damaged objects.The methods adopted by the laboratory include: (1) removing from theobjects the ionized chlorine which usually are the major cause of erosion; (2)strengthening the objects by soaking them in acrylic resins; and (3) applyingresins to the surface of the objects to protect them from further erosion.Chemicals much employed by the laboratory includes the acrylic resin(Ruschot; developed jointly by the Cultural Property Research Institute ofKorea and Samwha Paint Company), the sodium sesquicarbonate, the sodiumhydroxide, the lithium hydroxide, and the benzotriazole.Major apparatus in the laboratory includes the vacuum immersion tank, theairbrasive, the ultrasonic cleaner, the pH-ion meter, the water bath, the zoomstereo microscope, the drying oven, and the drill.

• 전자통신동향분석
• /
• 제35권5호
• /
• pp.92-101
• /
• 2020

Artificial intelligence (AI) has become the hottest topic in information and communications technology (ICT) in recent years. Along with the advancement of AI technology, technologies such as big data, cloud, and high-speed wired and wireless communication are being applied to existing media areas in earnest, affecting all parts of the media value chain from content production to consumption. AI technology is now spreading across the media industry faster than any other industry. In the future, the gap between those with and without AI technology will widen, further deepening the polarization of the media ecosystem. Media intelligence, which combines media and AI technologies, is now perceived as essential, not optional. In this paper, we examine the current status of technology development and standardization by major domestic and foreign institutions on how AI is being utilized in the media industry. In addition, we discuss what technology should be developed to lead media intelligence.

• 대한간호
• /
• 제31권5호
• /
• pp.65-71
• /
• 1992

In nursing, a practice discipline, it has been argued whether the mastery of clinical competence depends on types of learning styles, learning experience, and the use of specialized skills. All these problems are not limited to nursing education. Later educators identified the importance of reflective learning which is a vital element in any form of learning and that teachers and students need to consider how they can incorporate some forms of reflection in the courses. The purpose of this study is to review educational articles for understanding better what reflection in learning is, to identify the theme which is of important relevance to professional practice, from the book, Educating the reflective practitioner, and to discuss the theme within nursing education. Reflection in learning was defined by Dewey(1933) as the process which is involved the perception of relationships and connections between the parts of an experience. This experience is passed on when two people becoming involved with each other in a conversation. schon(1987) emphasized that learning conversation, which is a part of the interaction of student and teacher, is an important factor of the process of reflection-om-actopm. In clinical nursing education, good relationships between teacher and student, faculty's role, interpersonal skills are critical in learning conversation. Then Practing nurses who accept the need to choose nursing actionss on the basis of reflection, who accepet the necessity for understanding and being able to communicate the reasons for action are a powerfful force for the development of nursing into an increasingly more effective profession for the benefit of patients.

• 한국기계연구소 소보
• /
• 통권19호
• /
• pp.155-161
• /
• 1989

Generally cam-follower systems consist of two elements: Cam is for rotating motion and follower for reciprocating motion. Depending on the shape of cam and type of follower, the motion of cam-follower system is determined. Thus design process and analysis process must be well defined. The design process means to find the coordinates of cam shape which can be defined the given motion of follower and the analysis process means to determine the motion curve of follower corresponding to the given cam based on the dimensions of a cam-follower system. This paper consists of two parts : One is for development of a numerical method for design and analysis of cam-follower systems, the other is for development of a CAD program and its application. As the second part of the paper, the structure of a CAD program is introduced. Four data files are used in the program where the design process and the analysis process are carried out interactively to en hence its availability to the industrial applications. The first part of the paper 'presents the iterative contact method which can determine the contact points and their angles between cam and roller.

• 한국기계연구소 소보
• /
• 통권16호
• /
• pp.127-136
• /
• 1986

Recently deck crane of multi purpose cargo vessel (MPCV) is designed to posi¬tion in side instead of in the center line of the upper deck with a view to reduce the transportation cost and shipbuilding cost by shortening the length of ship. In this paper, the crane post was at first designed according to the crane maker’s specification and parent ship and the structure is analysed with Finite Ele¬ment Method. Through the careful reviews on the result of analysis, the final design of crane post was modified. The crane post is designed as a cylindrical in upper part and hexagonal in lower part instead of cylindrical on the whole as before. The connecting part of crane post is designed with the form of mixture of the cylinderical and hexagonal. Since the center of cylindrical and hexagonal section are not on the same line, it is expected to have the stress concentration. So, in order to attenuate the concentrated stress on the connecting part, the upper and lower parts was stiffened by inserting plate to enlarge the area of welding. The structure of deck part includes the tank side floor which is depend on the lower structure of the crane post that would support the force of the crane post by placing with 1.5 frame interval of the vertical plate.

• 보존과학연구
• /
• 통권24호
• /
• pp.131-152
• /
• 2003

In ancient times, many kinds of different inorganic pigments were used as colorants for making objects. These pigments are still evidentin well known objects such as Danchung, mural painting and Buddhist painting. This study discusses the results obtained from an analysis of the pigments used on the Buddha pigments. The results can be briefly summarized as below; Firstly, the microcrystalline structures revealed on the cross section of analyzed pigments, samples of which were taken from various parts of Buddha pigments show that different sizes and shapes of pigment particle were used for different purposes such as coloring, toning of the pigments. The arrangement of pigments and their usages are varied according to the owner temples and the place where it was created. Secondly, a result of the analysis on the composition and structure of the pigments shows that the main components in their composition are: Red pigments - Red lead($Pb_3O_4$) and Cinnabar(HgS)Green pigments - Malachite[$CuCO_3$.$Cu(OH)_2$] and Prussian Blue[$Fe4(Fe(CN)_6)_2$]Gold pigments - pure gold(Au)Yellow pigments - Orpiment($A_s2S_3)White pigments - Lead Cyanamide[$Pb_3(CO_3)_2(OH)_2]Ultramarine pigments - Azulite[$Cu_3(CO_3)_2(OH)_2]Especially, we knew that pigments used on the Ssanggye temple not repaired to the artificial synthetic pigment

• 콘크리트학회지
• /
• 제6권4호
• /
• pp.102-112
• /
• 1994

콘크리트의 건조수축은 수분확산과 밀접한 관계가 있으며, 수분확산과정은 온도와 습도에 의해 많은 영향을 받는다. 또한 물-시멘트비나 골재의 품질등에 의해서도 영향을 받기 때문에 고차의 비선형성을 보인다. 이 연구에서는 먼저 시간에 따른 콘크리트내의 수분분포를 해석하는 프로그램을 개발하고, 그리고 크리이프 및 온도와 숙성도에 따른 탄성계수의 변화를 고려하여 부등건조수축 및 부등응력을 계산하는 프로그램을 개발하였다. 이 프로그램에 의한 해석값들을 BP-KX 모델에 의해 계산된 건조수축값 및 실험값과 비교하여 좋은 결과를 보여 주었으며, 콘크리트내의 응력은 시간과 위치에 따라 정량적으로 계산되었다.

• 보존과학연구
• /
• 통권23호
• /
• pp.163-177
• /
• 2002

North monk-stupa and East monk-stupa , which are placed in Yeongoksa, are delicately sculptured and historically valued so they have been determined as National Treasures. It is assumed that North monk-stupa was made in early Goryeo Dynasty period. Parts of it were damaged by grave robbery in 2001. So restoration was begun in 2001. While restoring it, wrong arrangement on top of the monkstupa was rearranged. Top of East monk-stupa was also arranged in a wrong way so it was restored to its original form. Because each part of top of the monk-stupa was adhered with epoxy resin, it was separated by using thin saw. After being arranged in right order, the middle of monk-stupa was fixed by setting up stainless steel shaft. Anda of North monk-stupa, concerned about being damaged by crack, was adhered with epoxy resin.

• 보존과학연구
• /
• 통권23호
• /
• pp.113-129
• /
• 2002

This study is to disclose the gilding technique and distinctive features of using surface improvement technique in ancient gilt. There are many kinds of the ancient gilding technique so this thesis mainly focused on mercury amalgam gilding. Gilding technique can be largely divided into two branches – the cladding and amalgam method - in ancient periods. The researches have been carried out on two parts; the first is to find the making progress of amalgam on all sort of the gilding materials and the second is to show features of the gilded layer among basic metals. As a result of this experiment, to achieve good quality of amalgam, suitable particle size of the gilding material should be needed and the heating, a primary factor, has an effect on amalgam to be formed. Aspecial features of amalgam gilding, according to changing the basicmetal, would be influenced by chemical attraction for the mercury, condition of the surface and some other factors. A platers abilities and the making progress of amalgam would be influenced by a uniform and good gilding layer. In conclusion, it should be profoundly studied and investigated on the ancient gilding techniques and gold-gilt relics.

• 항공우주산업기술동향
• /
• 제8권1호
• /
• pp.131-139
• /
• 2010

1903년 항공기가 개발된 이래 항공전자(Avionics)는 항공기의 발달과 함께 발전해 왔다. 역사적으로 1910년대 무선통신을 시작으로 1920년대의 무선항법, 1930년대의 자동조종 도입 등 꾸준히 발달해 왔으며 GPS의 등장과 1979년 MD-80의 전자식 조종실 시현장치(1)의 등장으로 획기적인 전환을 이루게 된다. 현대 항공기에서 항공전자의 위치는 컴퓨터 이용 기술로 비행 안전성, 쾌적성 등의 측면에서 큰 비중을 차지하고 있다. 항공전자의 발달과 더불어 인증기술도 연동하여 개발이 되고 있다. 이 글에서는 최근 개발된 항공전자 인증기술을 소개한다.