• 한국광학회지
• /
• 제13권4호
• /
• pp.324-331
• /
• 2002

LED 램프의 기본 설계이론을 제시하였다. 설계된 LED 램프에 사용된 reflecting cup과 렌즈는 몇몇의 설계 변수에 의하여 다양한 형태로의 모양의 변화가 가능하다는 특징을 갖는다. Monte Carlo 기법을 이용하여 설계된 램프를 해석한 결과 다양한 응용분야에서 요구되는 빔 패턴특성을 손쉽게 구현할 수 있음을 확인할 수 있었다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2002년도 추계학술대회 논문집 전기물성,응용부문
• /
• pp.197-199
• /
• 2002

This paper describes the effects of chip arrangement configurations and the dimension of a reflecting cup upon the light output characteristics of a white lamp composed of RGB LED chips. As a result of simulation, the shorter distance between adjacent chips leads to a relative decrease in the light output efficiency due to inter-chip absorption of quanta, but rather uniform color mixing is expected. Among the factors of designing a reflecting cup it is the tilt angle of the cup wall that plays a determining role upon the variation of the light distribution. The light distribution shows a sudden change of pattern from Lambertian to Batwing at about $35^{\circ}{\sim}40^{\circ}$ of tilt angle in case of a silver-coated wall cup.

• 한국광학회지
• /
• 제23권5호
• /
• pp.222-226
• /
• 2012

본 논문에서는, LED 조명의 배광 특성의 조절이 용이한 반사컵 설계 방법을 제안하였다. 먼저 개별 반사컵의 구조와 높이에 대한 방사각의 변화 경향성을 파악하여, 높이에 따른 반사 특성을 확인하였다. 그 결과, 높이에 따라 반사 각도를 조절하여 설계함으로써 배광 분포의 세밀한 조절이 가능했다. 가장 간단한 2단 분할 방식의 경우 방사각의 제어나 균일도 개선을 할 수 있었다.

• 한국광학회지
• /
• 제21권1호
• /
• pp.26-32
• /
• 2010

플라스틱 광섬유의 주기적인 bending을 이용한 누설광섬유에 기반을 둔 라인램프를 제안하고, 그 핵심요소로서 높은 광결합효율을 갖는 LED-광섬유 결합기를 설계 및 해석하였다. Monte Carlo photon simulation 기법을 이용하여 해석한 결과, 결합기의 광결합효율은 반사컵 옆면의 기울기각 $\theta_w$와 반사컵의 반사도 $\rho_{ref}$에 대해 상대적으로 민감하게 영향을 받는 사실을 확인할 수 있었다. 광결합효율은 $\theta_w=60^{\circ}C$ 근처에서 최대가 되었는데, 이 값은 일반적인 LED 램프에서 흔히 사용하는 반사컵 옆면의 기울기각 $\theta_w=45^{\circ}$보다 상당히 큰 값이다. 그리고 반사컵의 반사도 $\rho_{ref}$가 0.8정도 이상이 되면, 광결합효율은 보통의 LD-광섬유 결합기에서 얻을 수 있는 광결합효율인 80% 정도를 뛰어 넘었다.

• 복식문화연구
• /
• 제22권6호
• /
• pp.943-954
• /
• 2014

The purpose of this study was to analyze the breast growth variation trends and characteristics of Korean adolescent girls based on 3D body measurements. Subjects were 174 girls aged between 13 and 18. 3D body scanning data were collected and the data were measured by Geomagic Design X program. The total of 18 anthropometric measurements and 4 index items were analyzed. The main results of this study are as follows: 1) Overall, the breast growth of adolescent girls got out of children's body shapes at the age of 14 and the adult's body shapes appeared remarkably at the age of 18. Before the age of 15, the adolescent girls' breast enlarged. 2) The surface lengths of upper body, which means the breast volume, showed significant growth above B cup groups rather than under A cup groups. The demand of B cup size (32.2%) was higher than A cup size (25.9%). And 35.6% of subjects' brassiere band size was 70. 3) The thorax grew evenly in the circumference, depth and breadth. The thoracic development related to the breast volume as well as the whole upper body's development. These results reveal that it is necessary to develop adolescent girls' brassiere reflecting on adolescent girls' breast growth variation trends and characteristics by age, breast size and thoracic development.

• 패션비즈니스
• /
• 제20권4호
• /
• pp.15-35
• /
• 2016

The purpose of this study was to develop brassiere pattern designed to fit the breast shapes based on ESMOD pattern. It has three quarters cup round shape and also consists of three parts; upper cup, lower cup, and wings. Breast types are classified into five shapes; ideal breast, flat breast, upper developed breast, lower developed breast, and projecting breast. Two subjects for each breast type wore the brassiere, and they evaluated the appearance and wearing twice. Type I for research pattern designed to fit into the breast shape reflecting details of breast size were assessed as superior to the divided commercial type. However, wings' tightness of Type I for research pattern brassiere was high. Thus, to improve wearing satisfaction, extra was added to wing. Based on the results of wearing experiments of Type I for research, we adjusted and modified Type II for research pattern. Subsequently, its appearance and wearing were evaluated, in order to be improved. For upper developed breast pattern, we extended the length of lower part to balance upper and lower part, as the upper part was somewhat long. The lower developed breast has the closest feature to the ideal breast, suggestive that implies it does not require much improvement Projecting breast pattern has minimal space in the lower part, so we added the support to lift them to be similar to the ideal breasts. For all the breast shapes, we reduced the wings' tightness from 8% to 7% so that we could extend the length of the wings.

• 조명전기설비학회논문지
• /
• 제23권8호
• /
• pp.8-13
• /
• 2009

LED 광원 기술의 발전과 더불어 응용분야도 다양하게 넓어지고 있다. 이중 본 논문에서는 액정 후면 배광 장치와 같이 고성능의 광원이 요구되는 응용제품에 적합한 광원을 제작하였다. 논문에서 제안한 광원은 금속산화물 절연층을 이용하여 LED chip에서 발생한 열을 효율적으로 외부로 전달하는 구조를 적용하였으며 패키지 구조가 아닌 chip과의 접촉면에 반사컵 구조를 적용하여 배광 분포 제어와 광자 재흡수 특성을 개선하였다.

• 한국의류학회지
• /
• 제31권5호
• /
• pp.729-741
• /
• 2007

In order to examine the characteristics of brassiere products for the 1924 generation brands on the market and grasp problems, we selected three 'comparative brassieres', each one from among the 1924 underwear brands with the highest recognition and sales profit, and then designed a 'sample brassiere' pattern(75A) with a similar shape to the comparative brassieres. We set up the "New Cup Grading Rule" with a view of reflecting the wearing effect that was varied according to cup sizes, graded the sizes of 75AA and 75B with this method, and made the sample brassieres in three sizes. We conducted the wearing evaluation and body measurements of 9 subjects after analyzing the patterns and characteristics of the sample brassieres and three comparative brassieres. As a result of the wearing evaluation, the sample and comparative brassiere 2, the dimensions and shapes were appropriate for the 1924 generation consumers and expressed an overall natural silhouette, showed satisfactory results in the entire evaluation questions. On the other hand, the comparative brassiere 1 and 3 that tended toward making a big change in the physical characteristics got unsatisfactory evaluations in the dimensions of the cups, clothing pressure, and bust silhouette. As a result of observing the variation in body dimensions by body measurements when nude and when wearing each brassiere and then summing it up with the score of the wearing evaluation, it was proven that too much change in body shape can create a negative image by upsetting the balance of the whole silhouette. Therefore, it is desirable to develop brassiere products with proper dimensions and clothing pressure that can make a physical change that harmonizes the overall bust silhouette and the position and shape of the breasts.

• 한국컴퓨터정보학회논문지
• /
• 제11권1호
• /
• pp.71-85
• /
• 2006

계산 그리드 환경은 서로 다른 성능과 이질적인 네트워크 상태들을 갖는 LAN/WAN으로 구성되고 다양한 형태의 프로그램이 수행된다. 이러한 환경에서 각 노드의 작업은 프로그램의 특성에 따라 이질적인 네트워크 환경과 각 노드의 컴퓨팅 파워를 고려하여 수행되기 때문에 자원 선택 브로커의 역할은 매우 중요하다. 본 논문은 계산 그리드 환경에서 프로그램 특성에 따라 네트워크 상태 정보와 각 노드의 성능을 고려하여 각 노드에 할당될 작업 프로세스의 수를 결정하는 새로운 자원 선택 브로커를 제안한다. 제안된 자원 선택 브로커는 다음과 같이 3단계로 구성된다. 첫째 프로그램의 특성을 반영하여 지연시간 대역폭 정보와 cup 혼합정보를 이용하여 각 노드의 성능비율을 계산하고, 이러한 비율에 의해 각 노드에서 수행될 작업 프로세스의 수를 결정한다. 둘째, 이전 단계에서 결정된 작업 프로세스의 수를 기반으로 RSL 파일을 자동으로 생성한다. 마지막으로, 각 노드는 RSL파일을 이용하여 작업 프로세스들을 생성하고 자신에 할당된 작업을 수행한다. 실험 결과에 의하면 작업량, 프로세스 수, 노드 수 관점에서 프로그램의 특성을 반영한 제안된 방법이 기존 방법(균등)과 지연시간-대역폭을 고려한 것에 비해 $278%\sim316%,\;524%\sim595%,\;924%\sim954%$ 향상되었다.

• 복식문화연구
• /
• 제10권6호
• /
• pp.748-762
• /
• 2002

The purpose of this study was to analyze the fashion trends of Korean men's golfwears and furnished the researchers of same major with reliable data base. Lately, Korean men were concerned about their appearance rather than social position. Moreover, they tried to express the needs of youthfulness with free lift through clothings. These trend had been showed itself not only development of golfwears, but also change of esthetic tastes of men's golfwears. First of all, the development of men's golfwears was affected by the major three factors out of many various factors. That is, popularization of golf by the international activities of Korean progolfers, appearance of young consumers after IMF and the casualization of the men's formal dress, the making an everyday dress of men's sportswears. The results of analyzing of fashion trends of the men's golfwears is as follow: 1. The characteristics with naturalness, comfort of men's golfwears was manifested casualization trends by the factors of downward tendency of golfer's age, 5-days working, men's biz casual preference, individual ism after IMF. 2. Men's character golfwears was showed by the ageless as a youthfulness expression, the Sportism as an international trend, 2002 world cup, etc. 3. All of golfwears have to be functional characteristics because the golf is an active sports spending long time in golf course. Unconstruction style was an important fashion trends of men's golfwears by using functional materials to meet the needs of consumers. 4. The men's clothing was deviated from a fixed idea called masculine after IMF. Moreover, this trend was increased by the appearance of lovely man, genderlessness and had an effect on men's golfwears. Consequently. men's golfwears was showed feminization characteristics as a feminine, sensitive style. In the future, Korean men will try to express their character and thought freely through golfwears, men's golfwears will be continued ‘beyond the golf course’ image reflecting in the future fashion trends.