• Proceedings of the Korea Concrete Institute Conference
• /
• 2010.05a
• /
• pp.67-68
• /
• 2010

The bond stress and crack spacing are effected the calculated crackwidth. EC2 and MC90 suggest crackwidth function that maximum crack spacing and difference average strain. This study is predict crackwidth, according to each design standard than comprison and analyis test data. The result, each design standard ways are predict well to test data.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2006.05a
• /
• pp.205-210
• /
• 2006

어드레스-표시 동시 구동방식에 의한 고속 구동기술을 개발하기 위하여 PDP의 어드레스 기간에 인가하는 주사 펄스의 폭에 의한 방전특성을 실험용 PDP를 사용하여 실험하였다. 본 연구에서는 주사 펄스의 폭과 주사 펄스와 이어서 인가되는 첫 번째 서스테인 펄스 사이의 시간간격을 변화시키면서 어드레스 방전특성을 측정하였다. 실험결과 주사펄스의 폭이 $1.3{\mu}s$ 이하로 좁아지면 어드레스 방전의 벽전하 대신에 공간전하로 서스테인 방전이 유도되므로 각 전극에 인가하는 펄스의 전압조건이 달라져야 한다는 것을 알았다 또한 주사 펄스폭이 좁아지면 어드레스 방전개시전압이 크게 상승함을 알았다. 실험결과 12개의 서브필드를 가지며 1080개의 주사선을 가지는 full-HDTV급 PDP를 구동시킬 수 있는 조건인 $0.7{\mu}s$ 수준의 주사 펄스폭 이상에서 약 10V의 일정한 서스테인 구동마진이 얻어짐을 알았다.

• Journal of Korean Society of Steel Construction
• /
• v.24 no.4
• /
• pp.451-458
• /
• 2012

The concrete-filled steel tube (CFT) that has an excellent performance can be more economically used when the steel tube has a large width-to-thickness ratio. However, the international provisions such as American Institute of Steel Construction (AISC) limit the use of a slender plate in CFT members, resulting in a less optimal use of CFT. This study verifies the post buckling strength of CFT columns through the experimental program for Hollow Steel Sections (HSS) and CFTs with a with-to-thickness ratio ranged 60 to 100. The study also proposes a relaxed limitations of with-to-thickness ratio compared to the one specified in the current standards.

• Journal of Korean Society of Coastal and Ocean Engineers
• /
• v.18 no.3
• /
• pp.241-250
• /
• 2006

In the present study, a beach survey such as sand sizes, swim zone widths, and slopes of swash zone has been accomplished for 39 beaches along the Gangwon coastline. The data analysis presents that the swim zone width has a strong correlation with the sand size, showing that the swim zone width is reversely proportional to the 1.1 power of a grain size. The profile factor A has been analyzed using the beach profile form of $h=Ay^{2/3}$, where A was resulted to be proportional to the 0.77 power of a gram size.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.13 no.4
• /
• pp.113-117
• /
• 2007

The study was performed on the development of system in which the bead width can be controlled. In order to control the bead width, we designed the automatic seam tracking device by attaching the probe type strain gauge sensor, motor driving slide and encoder to check the moving distance, and interface card connected MCU(80Cl96KC) upside the speed controllable carriage. Seam tracking experiments were done by changing the bead width. We compared and analyzed the sampling data which were obtained by output voltage of strain gauge sensor and rotary encoder pulse every 50ms.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.52 no.1
• /
• pp.48-58
• /
• 2015

The bandwidth enhancement of an aperture coupled microstrip patch antenna(ACMPA) with a high permittivity feed substrate suitable for the integration with MMIC is investigated using variation of an aperture width. As an aperture width increases, the 10 dB return loss bandwidth increases due to the increase of the mutual resonance region between a patch resonance and an aperture resonance. The bandwidth of an ACMPA with extended aperture width is increased up to 35.3 % from 20.8 % of the ACMPA with an aperture of a typical aspect ratio 10:1. The degradation of the radiation characteristics of an ACMPA due to the increase of an aperture width is very small.

• Journal of Korean Society of Transportation
• /
• v.15 no.1
• /
• pp.129-156
• /
• 1997

8차로 고속도로에서 중앙분리대와 길 어깨에 의해 측방 여유폭이 제공되는 외측차 로(1.4차로)와 측방 여유폭이 제공되지 않는 내측차로 (2.3차로)에서 나타나는 운전자의 횡 방향 주행특성을 4개 지점에서 비디오 촬영하여 분석한 결과는 다음과 같다. (1) 차량의 횡 방향 주행궤적은 차로의 중심으로부터 주행방향의 좌측으로 이격된 주행 행태를 보이고 있 으며 이는 운전석의 위치에 의한 영향으로 판단된다. (2) 차량의 병행 주행시 외측 차로의 중심 이격 거리는 평균 0.38m이고 내측차로의 중심 이격 거리는 평균 0.34m로 나타났으며 T-test 겨로가 내측 차로와 외측 차로의 주행 이격 거리는 신뢰도 95%에서 상이한 것으로 나타났다. (3) 외측 차로의 주행궤적간 이격 거리는 평균 3.90m이고 내측 차로의 주행궤적 간 이격 거리는 평균 3.54m로서 내측 차로의 주행궤적간 이격 거리는 외측 차로의 주행궤 적간 이격 거리보다 0.36m 작다. 특히 내측 차로의 주행궤적간 이격 거리는 내측 차로간 차로 중심간 간격인 3.6m 보다 0.1m 작은 것으로 나타났다. (4) 내측차로 확장 대안으로 기존 도로폭 유지안 (3.5m, 3.7m, 3.5m)과 기존 도로폭 확장안 (3.6m, 3.7m, 3.7m, 3.6m)을 고려할 수 있으며 두 대안의 비교·분석결과 경제적 영향을 고려할 때 기존 도로폭 유지안이 우수한 것으로 분석되었다.

• Korean Journal of Environment and Ecology
• /
• v.27 no.2
• /
• pp.253-265
• /
• 2013

This study was correlation analysis between provision and management of street green and street environment through field survey about city official roads(93 routes, 629.2km) in Seoul. Green belt under the street trees were 17.5% of all routes. Composition of street green belt width of 1~ 2m was the most common(11.6%). Management status as a protected facilities were protect frame and prtect cover installed inerval(60.1%). Interval of pruning was 63.5%. Type of tree was mainly 47.9%. Road width was mainly more than 8-line(51.3%). Sidewalk width was mainly 3~6m(84.1%)in environment status of street. Landuse was mainly commercial and business(70.3%). Electronic wire complete was mainly compete with crown(33.6%). Use of sidewalk was mainly used(16.3%). ANOVA analysis was conducted between the Street green and environment of Street. Street green belt(more than with 3m) was analyzed to be effective in street green manufacture. Natural green area of city's outside and Industrial area were analyzed to be effective. Use of sidewalk was to be a management. Protection facilities are installed on the narrow sidewalk width lower intensity. There was a higher strength in narrow sidewalk width, road width and compete with crown. And type of tree was higher strength similarly. Pruning and type of tree showd a significant correlation. Thus, ensure sufficient sidewalk width and land use should be considered for street green was effective manufacture and management. Species selection and pruning management was needed by consider electronic wire management, type of tree and landscape.

• Korean Journal of Cognitive Science
• /
• v.27 no.2
• /
• pp.325-353
• /
• 2016

The visual span refers to the number of letters that can be accurately recognized without moving one's eyes. The size of the visual span is affected by sensory factors such as perimetric complexity, crowding, and mislocation of letters. Korean Hangul utilizes rather unique alphabetic-syllabary writing system, quite different from English and Chinese writing systems. Due to this combinatorial nature of the script, the visual span for Hangul characters can also be affected by the letter type (e.g., CV vs CVCC). The present study examined the effect of syllable complexity on the visual span for Hangul by comparing letter recognition accuracy across four letter type conditions (C only, CV, CVC, and CVCC). We also aimed to determine the meaningful letter type(s) that is associated with differences in reading abilities in Korean. Using a trigram presentation method, we found that overall recognition accuracy declined as syllable complexity increased. However, the visual span for CVC type was greater than that for CV type, suggesting that the effect is not necessarily linear, and that there might be other factors affecting the visual span for these types of letters. C and CV type showed fairly strong positive correlations with reading comprehension, suggesting that these might be the meaningful units for measuring visual span in relating to reading abilities.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.29 no.1
• /
• pp.115-124
• /
• 2002

The purpose of this study was to establish regression equations and probability charts for predicting the sum of mesiodistal crown diameters of unerupted unilateral canine and premolars from the sum of mesiodistal crown diameters of four mandibular incisors in Korean male and female. The plaster casts of 162 children(75 boys and 87 girls) among the contestees in 1994-2001 Healthy Dentition Contest in Seoul were measured. Sex differences are compared and the following results were obtained: 1. Bilateral comparison of sum of widths of permanent canine and premolars showed no significant differences for either sex(p>0.05). Sum of widths of permanent canine and premolars of male were significantly larger than that of female(p<0.01). 2. Regression equations for the prediction of sum of widths of permanent canine and premolars in each sex were as follows Male ${\Sigma}Maxillary$ 345 y= 10.45+0.53x Male ${\Sigma}Mandibular$ 345 : y= 10.07+0.51x Female ${\Sigma}Maxillary$ 345 : y=12.65+0.42x Female ${\Sigma}Mandibular$ 345 : y=11.70+0.42x Male+female ${\Sigma}Maxillary$ 345 y=11.01+0.50x Male+female ${\Sigma}Mandibular$ 345 : y=9.87+0.51x