• International Journal of Precision Engineering and Manufacturing
• /
• 제8권2호
• /
• pp.38-43
• /
• 2007

This paper describes ultrasonically assisted grinding used to obtain a glossy surface quickly and precisely. High-quality surfaces are required for plastic injection molding dies used in the production of plastic parts such as dials for cellular phones. Traditionally, in order to finish the dies, manual polishing by a skilled worker has been required after the machining processes, such as electro discharge machining (EDM), which leaves an affected layer, and milling, which leaves tooling marks. However, manual polishing causes detrimental geometrical deviations of the die and consumes several days to finish a die surface. Therefore, a machining process for finishing dies without manual polishing to improve the surface roughness and form accuracy would be extremely valuable. In this study, a 3D positioning machine equipped with an ultrasonic spindle was used to conduct grinding experiments. An electroplated diamond tool was used for these experiments. Generally, diamond tools cannot grind steel because of excessive wear as a result of carbon atoms diffusing into bulk steel and chips. However, ultrasonically assisted grinding can achieve a fine surface (roughness Rz of $0.4{\mu}m$) on die steel without severe tool wear. The final aim of this study is to realize mirror surface grinding for injection molding dies without manual polishing. To do this, it is necessary to fabricate an electroplated diamond tool with high form accuracy and low run-out. This paper describes a tool-making method for high precision grinding and the grinding performance of a self-electroplated tool. The ground surface textures, tool performance and tool life were investigated A ground surface roughness Rz of 0.14 um was achieved Our results show that the spindle speed, feed rate and cross feed affected the surface texture. One tool could finish $5000mm^2$ of die steel surface without any deterioration of the ground surface roughness.

• 디자인학연구
• /
• 제15권3호
• /
• pp.63-72
• /
• 2002

우리 일상생활에서 밀접하게 접하고 사용하고 있는 샤프펜슬에 사용편의성(쓰기 편한 정도)을 1.사용 전 보았을 때 예전 경험치로 직감적으로 느끼는 감, 2.직접 잡았을 때 느낌(착용감), 3.직접 종이 위에 쓰면서 느끼는 느낌 (필기감), 이 세 가지 주요평가항목으로 설정한 후 36개의 대표샘플을 가지고 실증적 실험방법으로 서로의 관계 및 직접 영향을 미치는 항목을 구체적으로 밝혔다. 본 연구에서는 사용편의성과 사용 전 보았을 때 예전 경험치로 직감적으로 느끼는 감의 항목에서는 서로는 높은 상관관계는 없었다. 이는 경험치에서 얻은 기대치가 실제로 사용에서는 기대치에 미치지 못하였기 때문이라고 판단한다. 사용편의성과 착용감, 필기감은 높은 상관관계를 가지고있었다. 이는 사용편의성에 있어 착용감과 필기감은 서로 밀접한 관계이기 때문이라고 판단한다. 사용편의성이 좋은 샤프펜슬은 구조적으로 전체길이가 길며(169mm), 굵기는 보통(8.5mm), 무게는 약간 무거운(21.4g), 중심은 야간 아래쪽인(60mm)에 위치하며, 단면형상은 정원이 아닌 변형형상이며, 손가락 접지부의 표면처리는 가로 홈이 나있는 것이고, 몸통은 광택이 있는 것으로 나타났다.

• 한국실내디자인학회:학술대회논문집
• /
• 한국실내디자인학회 2008년도 춘계학술발표대회 논문집
• /
• pp.32-35
• /
• 2008

If human beings could make friends with nature, it would be a truly wellbeing. This project has selected the design concept under the supposition that human beings and the nature become friends. This residential house, which is consisted of one ground floor and two underground floors, is confronting the mountains that surround the residential complex. Residents can enjoy viewing the mountains from the living room. The garden is created by using this given environment in maximum. The walls are made up with rocks, and a small pond is formed with water from the mountain, presenting another attractive sight. Through the connection rather than the break between mountain and garden, living room and garden, and again garden and mountain, the dialogue with nature was attempted. The water of the pond in the garden flows down along the walls and creates another water space at the gate area of the house. Passing through the entrance, there are a living room, a kitchen, a bedroom for spouses, a common bathroom, and a library on the ground floor. On the second floor, there are two rooms, a bathroom, and a mini living room. The platform of living room on the 1st floor is lowered to produce the comfortable living room with the hearth. From the view of living room, the garden with full feeling of nature can give a good emotional rest for modem people who want the mental relaxation. The marble stones are used as its material to present rich texture and sophisticated image presentation. The hearth in the living room is harmonized with high-tech electronic home appliances and surrounding accessories. On the kitchen, the high-glossy materials are used to express the external appearance neatly and the depository function is more improved for housewives.

• 패션비즈니스
• /
• 제13권4호
• /
• pp.60-76
• /
• 2009

Expression of woman characters in fusion traditional dramas plays a role of making the progress of dramas not bigoted and new. Especially, woman characters have a high weight as a heroine by an increase in their image in fusion traditional dramas. Expression of characters harmonizing modern with tradition has also given a help in reflecting a trend of the present times. Hair style and face makeup of woman characters in fusion traditional dramas are in the process of fusionization getting an effect from postmodernism. They are expressing the hair style of symbolization modern elements of hair style to traditional hair styles. They also expressed a neutral image with faded hair styles in the shaggy cut style and dye of neoplaticism. Neo-hippie style was changed into the style of naturalism and nationalism and the hair style braided in various branches as the one of Indians was changed into a primitive and national feature. It is producing a new style by permitting even a long-hair permanent wave hair style. Expression of straight hair style, a long-hair shaggy & bulging wave style and a hair style of neoplaticism, was distinguished. In the side of face makeup, they expressed its luxurious and splendid style by attaching great importance to its luster and are exposing images of characters by a smoky makeup emphasizing eye lines. Their face makeup was almost never separated from present dramas as using pearl shadow in a glossy lips makeup and color, which made it possible to express it more dramatically in fusion traditional dramas than in present dramas. In the event of the makeup element of fusion traditional dramas permitting diversity, the character makeup of fusion traditional dramas made a foundation to show people diverse elements of makeup by mix & match a present elements and past elements of historical research, which made it possible to express a unique makeup or a special makeup. Diverse makeup expressions were limited by reflection of illumination even in the existing videos. Therefore, 'Fusion' made it possible to express it more freely in fusion traditional dramas than in present dramas.

• 자연과학논문집
• /
• 제11권1호
• /
• pp.137-142
• /
• 1999

미국 J.C. Raulston 식물원에는 한국자생 조경수목 36과 110종 3품종이 재배되고 있다. 이중 때죽나무 'Emerald Pagoda'는 1985년 미국 국립식물원 식물탐사팀과 J.C. Raulston이 소흑산도에서 채집한 우리나라 자생종으로 미국내에서 감상가치가 매우 뛰어난 것으로 평가받고 있다. J.C. Raulston은 이 때죽나무를 'Sohuksan'이라고 명명하였다가 'Emerald Pagoda'로 개칭하였는데 미국으로 수화물에 보관하여 도입하였다. 또한 아왜나무를 진도에서 채집하였는데, 이것은 지금도 'Chindo'라는 품종으로 불리고 있으며 미국내 동남부 지방의 조경에 적응성이 높고 감상가치가 높아 대량번식 및 보급 중에 있다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제32권7호
• /
• pp.977-987
• /
• 2019

Objective: The use of tannin extract and other phytochemicals as dietary additives in ruminants is becoming more popular due to their wide biological actions such as in methane mitigation, bypass of dietary protein, intestinal nematode control, among other uses. Unfortunately, some have strong astringency, low stability and bioavailability, and negatively affecting dry matter intake and digestibility. To circumvent these drawbacks, an effective delivery system may offer a promising approach to administer these extracts to the site where they are required. The objectives of this study were to encapsulate acacia tannin extract (ATE) with native starch and maltodextrin-gum arabic and to test the effect of encapsulation parameters on encapsulation efficiency, yield and morphology of the microparticles obtained as well as the effect on rumen in vitro gas production. Methods: The ATE was encapsulated with the wall materials, and the morphological features of freeze-dried microparticles were evaluated by scanning electron microscopy. The in vitro release pattern of microparticles in acetate buffer, simulating the rumen, and its effect on in vitro gas production was evaluated. Results: The morphological features revealed that maltodextrin/gum-arabic microparticles were irregular shaped, glossy and smaller, compared with those encapsulated with native starch, which were bigger, and more homogenous. Maltodextrin-gum arabic could be used up to 30% loading concentration compared with starch, which could not hold the core material beyond 15% loading capacity. Encapsulation efficiency ranged from $27.7%{\pm}6.4%$ to $48.8%{\pm}5.5%$ in starch and $56.1%{\pm}4.9%$ to $64.8%{\pm}2.8%$ in maltodextrin-gum arabic microparticles. Only a slight reduction in methane emission was recorded in encapsulated microparticles when compared with the samples containing only wall materials. Conclusion: Both encapsulated products exhibited the burst release pattern under the pH conditions and methane reduction associated with tannin was marginal. This is attributable to small loading percentages and therefore, other wall materials or encapsulation methods should be investigated.

• 한국의상디자인학회지
• /
• 제22권4호
• /
• pp.115-125
• /
• 2020

Rider jackets were once reserved for military uniforms but have become an important styling item in recent fashion trends. The design characteristics of the rider jacket are rooted in symbolism, and the image associated with a rider jacket is in line with the challenging of authority and being a member of the rebellious youth subculture. Usually, young people with anti-social tendencies wore jackets, and some styles were used as a medium to express their emotional homogeneity, and they received favorable responses as the items represented them. The design characteristics of a rider jacket can be largely divided into resistance against the older generation, violence, challenging cultural norms, sexuality, and resistance, as well as embodying violent characteristics, including strength, courage. and male chauvinism. The reason for the development of these challenging characteristics are disparagement and anger of the lower class, who were excluded from mainstream society. Rider jackets can be viewed negatively due to the kind of message it is conveying against mainstream society. Among the sexual features were leather pants, short-length leather rider jackets, glossy metal accessories, and belt buckles, which also highlighted gay and decadent images that came to be associated with the jackets. The drapery created various kinds of wrinkles according to the way of dressing, and it had beautiful expressiveness while serving to express the body more beautifully. Drapery can be classified according to the aesthetic characteristics or expression techniques, and if the type of drapery is classified according to the morphological characteristics, it can be classified into variable and fixed structures, depending on whether the part to which the drapery is applied is fluid or not. In other words, it depends on the dressing method or the intention, and if the drapery technique is directly applied to the garment or is attached to the form. This fashion design proposal may have the greatest significance in that it sought to propose a new style incorporating a drapery technique with a strong feminine image to a rider jacket, which traditionally was associated with a masculine image.

• 한국작물학회지
• /
• 제59권4호
• /
• pp.457-462
• /
• 2014

본 연구는 수요와 재배면적이 점차 확대되고 있는 수수의 안정적인 생산을 확립하기 위한 기초자료로 활용하고자 주요 4품종(남풍찰, 동안메, 황금찰, 흰찰)을 이용하여 종자의 형태적 특성과 다양한 종자세 검사 등 종자의 기본적인 특성을 알아보았다. 1. 수수의 형태적 특성에서는 폭을 제외한 장과 두께는 차이가 나타나지 않았으며, 종실형태는 흰찰은 원형, 나머지 품종은 난형의 형상으로 보였다. 종피색에서는 흰찰과 나머지 품종간의 뚜렷한 차이를 보이며, 남풍찰과 황금찰은 무광택 종자이었다. 2. 표준발아검사 및 저온검사는 황금찰>남풍찰>동안메>흰찰 순으로 나타났고, 노화촉진검사에서는 표준발아 검사와 비교시 동안메에서만 15% 이상의 감소를 보였으며, 전기전도율 검사는 표준발아검사, 저온검사 및 노화촉진검사의 발아율과 부의 상관관계를 나타났다. 3. 출현율 평가에서는 황금찰이 가장 높은 85.7%로, 가장 낮은 출현율을 보인 흰찰보다 40% 이상의 차이가 나타났고, 평균 출현율일수에서는 흰찰이 가장 느린 6.0일로 보이며 품종별 뚜렷한 차이가 나타났다.

• 대한본초학회지
• /
• 제21권2호
• /
• pp.109-119
• /
• 2006

Objectives : This study was performed to approach of properties-flavours theory and the study of morphological standard in CORNI FRUCTUS. Methods : The properties-flavours theory were attempted with bibliographic method and various climate-information. The external-internal morphological standards were determined by using stereoscope and butanol series. Results and conclusion : 1. The significant analysis for the corni fructus as the properties-flavours theory, is a follow-up survey of the effect written in the official oriental medicine book. 2. The other analytic methods according to the gathering time, processing or storing system or especially nature or growth environment(altitude, temperature,. the mean moisture, and the agronomical survey) by way of the explanation of properties-flavours theory appears so many insufficiency at the many cases. 3. The external and internal characteristics according to the shape of original plant or herbal states, entirely correspond to all the literature on this subject. 4. According to the place of production, there are some different points. (l) In the external shapes, it is reasonable that if we make the basic standard of classification by the sharpness of color, the existence of gloss and the size of products. In the case of the Korean products, it shows bright and glossy color totally, but in the case of North Korea products, it shows black and lackluster. And in the case of the foreign products, it has softer body than Korea one and shows white color on the surface. (2) In the internal shapes, the Korea products has a thicker cuticle layer than the foreign one, and has fewer ca-oxalate in the parenchyma cell.

• 한국조리학회지
• /
• 제18권3호
• /
• pp.252-265
• /
• 2012

본 연구의 목적은 청국장 파우더를 첨가하여 부가가치를 높인 기능성 소스를 개발하는데 있다. 본 연구는 아래 절차에 따라 진행되었다. 청국장 파우더를 10, 20, 30, 40%를 첨가하여 베샤멜소스를 제조한 후 물리적 검사(수분, 색도, 점도, 염도, 퍼짐성, pH)와 관능검사(정량적 묘사분석, 기호도 검사)를 실시한 후 관능검사와 물리적 검사와의 상관관계를 알아보았고 최적의 배합비를 선정하고자 하였으며 연구결과는 다음과 같다. 청국장 파우더의 첨가량이 증가할수록 a값, b값, 염도, 퍼짐성, pH는 유의적(p<0.001)으로 증가하였고 수분함량, L값, 점도는 감소하였다. QDA결과, 색의 강도(5.89), 청국장 냄새(5.32), 청국장 맛(6.26)에서 청국장파우더 40% 첨가군이 가장 높은 값을 나타내었다. 걸쭉한 정도(6.42), 우유냄새(5.00), 느끼한 맛(5.21), 입안에서의 촉감(5.32)에서 대조군이 가장 높은 평가를 받았다. 그래서 청국장파우더 첨가를 증가함에 따라 색의 강도, 청국장 냄새, 청국장 맛이 증가하였고 걸쭉한 정도, 우유냄새, 느끼한 맛, 입안에서의 촉감을 감소하는 경향을 보였다. 기호도 검사 결과 청국장파우더 20% 첨가군에서 외관, 향, 맛, 윤기, 전체적인 기호도의 높은 평가를 받았다. 이상의 연구결과를 통해 적절한 청국장파우더의 첨가는 전체적인 기호도에 긍정적인 영향을 미치며, 청국장파우더 20% 첨가시 베샤멜소스의 관능적 및 물리적인 품질특성의 향상이 가능한 가장 적절한 첨가 수준이라고 사료된다.