• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 추계학술대회 논문집
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• pp.653-657
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• 1996

This paper presents adaptive cutting force control in milling process using indirect cutting force measurement. The cutting forces in X, Y, and Z axes are measured indirectly from the sensing current of the feed-drive servo motor. After modelling the feed-drive system of a horizontal machining center, the relation between the cutting force and the servo motor current is analyzed. The pulsating milling forces are measured from the sensing current within the bandwidth of the servo. It is shown that indirect cutting farce measurement can be used in adaptive cutting force control. The adaptive control scheme which is globally convergent and stable is attached to a commercial CNC machining center. Cutting experiments on end milling are performed for diagonal cutting.

• International Journal of Precision Engineering and Manufacturing
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• 제3권4호
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• pp.31-36
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• 2002

A continuous tool-path, that is to cut continuously with the minimum number of cutter retractions during the cutting operations, is developed in order to minimise the fluctuation of cutting load and the possibility of chipping on the cutting edge in HSM (high-speed machining). This algorithm begins with the offset procedure along the boundary curve of the sculptured surface being machined. In the of offset procedure, the offset distance is determined such that the scallop height maintains a constant roughness to ensure higher levels of efficiency and quality in high-speed machining. Then, the continuous path is generated as a kind of the diagonal curve between the offset curves. This path strategy is able to connect to neighbor paths without cutter retractions. Therefore, the minimum tool retraction tool-path can be generated And, it allows the sculptured surface incorporating both steep and flat areas to be high-speed machined.

• 복식
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• 제56권7호
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• pp.152-166
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• 2006

The purpose of this study was to make patterns for lingerie look after examining expressive characteristics and constructive elements of lingerie look. As underwear became outerwear, position of wearing, materials, and details had changed, and the phenomenon to expose one's body has increased. The constructive elements found in the lingerie look were classified into silhouette, fastening, dart, and cutting line. Many of corset looks revealed cutting lines such as diagonal, perpendicular, and horizon. Brassiere look used perpendicular rutting lines or horizontal cutting lines passing through the bust point in order to highlight the volume by adding darts. There were styles Of chemise looks that used princess lines or separately added a brassier on the breast. Based on the examination of the elements, a total of four apparel works were created, including one flat pattern and three draping patterns. With new infra-apparel designs and patterns, this study was able to artificially highlight the body and express the beauty of costume through revelation of body. In addition, it explored the possibility that the phenomenon that underwear becomes outerwear may be a new idea of dress designing.

• 한국통신학회논문지
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• 제12권3호
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• pp.267-275
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• 1987

회로망내에 존재하는 절점과 가지를 분할하여 몇 개의 부분회로망으로 나누고 분할절점에서의 전압 및 전류관계식으로부터 회로망방정식을 정식화하여 각 부분회로망 별로 독립적으로 처리함으로서 대형회로망을 효율적으로 해석할 수 있도록 하였다. 본 논문에서 제안한 분할회로망에 대한 방정식은 분할하기 전의 단일회로망에 대한 방정식과 비교할 때 절점의 순서만 재 배열한 결과가 되므로, 종래의 단일회로망에 대한 산법을 그대로 분할법에 적용할 수 있다. 또한, 어드미턴스행렬의 블록대각형구조를 이용한 병렬계산 알고리즘을 제시하였다.

• ETRI Journal
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• 제32권2호
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• pp.312-318
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• 2010

A small reconfigurable patch antenna is proposed to achieve polarization diversity for digital multimedia broadcasting systems at 2.6 GHz. To obtain polarization diversity, a pair of on-slit PIN diodes is inserted in each diagonal of a cross-shaped patch. Thus, four PIN-diodes on these slits are utilized to change the connection of the slits and thus achieve polarization. Bias circuits for the diodes are allocated in the cutting corner of the cross-shaped patch to minimize the antenna size. The antenna produces left-hand circular polarization, right-hand circular polarization, or linear polarization, depending on the PIN-diode status. Analysis of circular polarization operation is explicated. Measurements show a gain of about 1.5 dB, a cross polarization of about -20 dB, and an axial ratio of about 2.5 dB.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 추계학술대회
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• pp.65-67
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• 2015

본 논문에서는 소형 WLAN 안테나에 적용 가능한 안테나 설계를 설계하고 적용 가능성을 검토하였다. 제안된 안테나는 $45mm{\times}45mm$ 크기의 RF4 기판(비유전율 4.4, 두께 1.6 mm, 손실탄젠트 0.025) 위에 $29mm{\times}29mm$ 크기의 마이크로스트립 패치 안테나를 인쇄하여 MoM법으로 계산하였다. 광대역 특성을 얻기 위하여 기판 상부에 위치한 패치 안테나의 대각 모서리를 3.2mm 커팅 처리하고 급전부는 50ohm 임피던스 정합을 위해 안테나 중심축에서 수평 방향으로 5.1mm 위치로 결정하였다. 계산 결과로서 WLAN 사용대역 2.4-2.48GHz을 고려할 때 정재파비가 2 이하인 주파수 대역은 2.365-2.45GHz(85MHz, 3.53%)로 나타났다.

• 복식
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• 제63권7호
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• pp.31-48
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• 2013

It goes without saying that Yi Mae-Bang, as the sole owner of two of the intangible cultural assets including No. 27 Seungmu in 1987 and No. 97 Salpuri Chum, is a top-notch Korean traditional dancer. Moreover, in regards to traditional clothing, he is also known as the only traditional dancer who directly performs on stage as well as analyzes traditional clothing in order to apply them into his own dance performances by designing and producing them to meet his artistic spirit. In order to examine how Yi Mae-Bang's unique and creative stage clothing was developed, and what kind of process it went through to possess its unique style, which draws the attentions of people with its harmony of beauty and dance, this research first examined the change of the composition through the yearly picture data. Before 1984, the composition of the Salpuri Chum clothes changed by putting on 'Jeogori' on the 'Mudong-Bok' without the 'Kweia' (sleeveless), and in 1999 'Mudong-Bok' became widened with the decoration of embroidered hem making it more attractively colorful. after 2000 it became more splendidly adorned by embroidering hem on widened Mudong-Bok and tucking 'Kweja' in the layers which created silhouette like a dress that is seemingly wider and luxuriant than a skirt. One of notable features of Yi Mae-Bang's Salpuri is that its cloth and cuff ribbons are lightly colored in different colors enclosing the tip part. As for the ribbons, it was also changed as time went by from direct-cutting of the cloth just like the A-line of Mudong-Bok to drawing a diagonal line less than 5cm above the ribbon and 8cm below the ribbon so that it takes the form of getting widened as it gets to the lower part, and its length was also elongated in proportion to that of the bottom of Mudong-Bok.

• 한국항해항만학회지
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• 제38권6호
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• pp.623-627
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• 2014

최근에 인체 중심의 무선통신 기술에 대한 관심이 증가하면서 입을 수 있는 안테나에 대한 연구가 활발히 진행되고 있다. 본 논문에서는 GPS 주파수를 수신할 수 있는 입을 수 있는 안테나를 제안하였다. 두께 0.7mm의 염소가죽을 유전체 기판으로 사용하고, 두께 0.08mm의 구리 폴리에스터 천을 방사체 및 접지판으로 사용하여 안테나를 제작하였다. 원형 편파 특성을 얻기 위해 정사각형의 패치에 대각선 방향에 놓인 모서리를 짤라서 방사체를 만들었고, 도전성 천과 가죽을 에폭시를 사용하여 접착하였다. 먼저 염소가죽의 유전율을 구하기 위해 크기가 다른 3개의 정사각형 패치 안테나를 만들고, 실험 및 시뮬레이션을 통해 염소가죽의 유전상수를 구하였다. 이것을 바탕으로 GPS 대역에서 동작하는 안테나를 설계하고, 제작하여 실험을 통해 안테나의 성능을 검증하였다. 옷의 어깨 부분에 설치하여, 사람이 입고 측정하여 특성의 변화를 실험하였고, 상용 세라믹 GPS 안테나와 수신 감도 특성을 비교하여 제작된 안테나가 비슷한 수준의 감도를 갖고 있음을 확인하였다.

• 한국생활과학회지
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• 제24권5호
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• pp.687-700
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• 2015

Lines of non-extension (LoNEs) on torso surface during arm abduction were investigated to provide appropriate location for inserting less-extensible yarns which can be used as seams for design and or clothing pressure variation. As experimental methods, reference points about 3 cm apart were marked on the skin and scanned at 30, $90^{\circ}$ and $135^{\circ}$ arm abduction. Skin deformation was measured by connecting reference points in horizontal, vertical and various angles of diagonal directions. Observation of skin deformation was made within the separated sections of the torso as well as integrated ones to cover the various occasions of design application. LoNEs of front and back torso were provided as mapping lines. Actual compression wear of three types was constructed with different pattern reduction rate at each separated section using LoNEs as boundary cutting lines. Clothing pressure and subjective evaluations of those three compression wear were evaluated by six subjects. LoNEs found in this study were useful as seam lines to differentiate clothing pressure at each part of the body, providing positive wear sensation. It is also expected that LoNEs can be paths for less strechable conductive yarns of IT-integrated upper garments.

• 박물관보존과학
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• 제24권
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• pp.1-16
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• 2020

대구 달성 고분군 중 하나인 55호분에서 발견된 부장품 중 삼엽문이자태도의 재보존처리와 제작 기법에 관한 연구이다. 이자태도는 모도가 2점, 자도가 4점이 부착된 이합도이고 출토된 완형으로는 유일하다. 과거 2회의 보존처리가 실시된 기록이 있으며 이번에 균열부 보강제 교체를 위한 재보존처리와 함께 컴퓨터 단층촬영(CT), XRF분석, 실체현미경 관찰을 통해 유물의 재질, 성분, 제작 기법을 조사하였다. 주성분은 구리(Cu)이고 금색 부분에서는 금(Au)과 수은(Hg)이 함께 검출된 것으로 보아 구리에 수은 아말감 금도금을 한 금동으로 추정된다. 제작 기법을 조사한 결과 둥근 삼엽문의 환두부와 병부의 연결은 슴베 부분을 만들어 끼웠고 병판만 금속판으로 제작되어 있는 것을 보아 장식으로서의 기능이 높다고 판단할 수 있다. 상부 자도의 결합 방식은 모도와 같고, 하부 자도는 하나의 금속판을 재단하여 만들었다. 검초는 총 2개의 판을 재단하여 만들었고 상부 자도를 검초에 고정하기 위해 자도 도신부의 아래쪽에 지지대를 넣었으며 하부 자도는 검초 일부를 재단하여 안으로 꽂아 넣었다. 표현된 문양은, 환두부는 삼엽문, 병판은 횡주 연호문, 초구금구와 초미금구는 파상형 점열문, 어미형 초미금구는 점열문을 시문하여 제작되었다.