https://oak.chosun.ac.kr/handle/2020.oak/19127 2026-04-09T20:29:41Z 2026-04-09T20:29:41Z 문치호 주명칠 https://oak.chosun.ac.kr/handle/2020.oak/19166 2024-04-30T02:33:58Z 2015-12-31T15:00:00Z

Title: 덩굴식물 소재개발을 위한 형질변이 연구 Author(s): 문치호; 주명칠 Abstract: This study has been conducted for developing climbing plants which came into wide use on valuable landscaping as attachable plants of the pot-plants & slopes afforestation. The research result is as below by understanding spontaneous mutation of each individual, researching characteristic changes on shapes, sizes, patterns, stem & leaf color of mutated plants. 13 orders, 16 families, 21 species, total 80 types character variations are expressed from the naturally mutated climbing plants from the domestic field and mountains. Character variation expression ratio classified as order has been researched as follows; Gentianales 41%, Ranunculales 11%, Rhamnales 9%, Rosales 9%, Magnoliales 6%, Rubiales 4%, Liliales 4%, Urticales 4%, Myrtales 3%, Sapindales 3%, Umbelliflorae 3%, Parietales 3% and Tubiflorales 3%. The result of the expression research from the classified 15 pattern types is as follows; 11 species from scattered, 10 from splashed scattered, 5 from viridescence, 4 from thick margined, 3 from margined, 3 from settled snowy, 3 from reticulated splashed, 2 from center penetrated and 1 each from thinly margined/broadly margined/splashed margined/stripe/center concentrated/viridescence banded/blotched splashed. The pattern colors are expressed as ivory white 38%, light yellow 29%, yellow 14%, light green 12%, and white 9%. From the leaf mutated plants, the expression found from the microphyll of the Lonicera japonica/Ficus nipponica/Trachelospermum, ragged shape from the Ficus nipponica/Trachelospermum, azygos lobe/wave from/spiral/potato leaf shape from the Trachelospermum, cocks comb/circle from the Trachelospermum, deep splitting from the Kadsura japonica/Akebia quinata/Trachelospermum, all round from the Ficus nipponica/ Trachelospermum/Wistaria floribunda, and the stem pattern from the Berchemia racemosa. More than two mutations are expressed from the 6 orders, 6 families, 6 species, total 18 types. C grades are found from the Trachelospermum/Wistaria floribunda/Actinidia arguta. B grades are found from the Trachelospermum as microphyllic rim variegation spiral.

2015-12-31T15:00:00Z 박세연 최세원 오용택 신동찬 https://oak.chosun.ac.kr/handle/2020.oak/19163 2024-04-30T02:33:58Z 2015-12-31T15:00:00Z

Title: 용액법을 이용한 [C12mim][TFSI] 용매에서의 Alq3 결정 성장 메커니즘 Author(s): 박세연; 최세원; 오용택; 신동찬 Abstract: The organic semiconductor is promising material for flexible electronics due to many advantages such as simple manufacturing process, inexpensive, and flexibility. The high purity single crystal of the organic semiconductor, however, is not easily obtained and thus degradation of electrical property is a big hurdle for organic electronics applications. We have investigated the growth mechanism of Alq3 single-crystal using a [C12mim][TFSI] ionic liquid as a solvent. Isothermal heat-treatment has been carried out at 100℃ for 1h, 3h, 24h, and 120h with 9 mol% composition. We can make high quality single crystal of Alq3 via just one time process using ionic liquid. The shape of Alq3 single-crystal changes from hollow structure to filled hexagonal-rod shape. Now we are trying to measure the electrical properties of the Alq3 single crystal. Our research could be promising process to improve electrical properties of organic semiconductor such as Organic Light Emitting Diode (OLED), Organic Thin Film Transistor (OTFT), and Organic Solar Cell.

2015-12-31T15:00:00Z 권재범 김태훈 강경인 https://oak.chosun.ac.kr/handle/2020.oak/19167 2024-04-30T02:33:58Z 2015-12-31T15:00:00Z

Title: 초고층 건축공사의 생산성 향상을 위한 Jump Point Search 기반 작업층 자재배치 최적화 모델 Author(s): 권재범; 김태훈; 강경인 Abstract: In tall building construction, time for transporting materials on a floor is one of the factors which largely affect work productivity. Thus, the necessity of optimizing the floor-level layout plan has increased, and path finding algorithms to find an optimal path by considering various obstacles have been required to provide a more reliable floor-level layout planning. Jump point search (JPS) algorithm has high accuracy of optimal paths through global search by minimizing the computational problem, compared to heuristic search algorithms that find paths at the moderate level to reduce the computational time and effort. Therefore, this study proposes a floor-level layout planning model for tall building construction based on optimal path finding by the JPS algorithm. The applicability of the JPS algorithm to the construction field was verified by increasing work productivity of the floor-level layout planning of the heuristic search by approximately 14%. The proposed path finding algorithm will contribute to preparing a more reliable construction layout planning model.

2015-12-31T15:00:00Z 김자연 조유현 박현선 김두형 김민우 박종락 권민기 https://oak.chosun.ac.kr/handle/2020.oak/19165 2024-04-30T02:33:58Z 2015-12-31T15:00:00Z

Title: 질화갈륨 기반 다각형 발광다이오드의 광추출 효율 향상 Author(s): 김자연; 조유현; 박현선; 김두형; 김민우; 박종락; 권민기 Abstract: GaN based LEDs have gradually replaced traditional light sources in various applications including backlight display units, traffic signals, automotive lighting, architectural lighting, and general lighting. However, improvements to the external quantum efficiency (EQE) are required for these various application. The EQE of LED is correlated to the internal quantum efficiency (IQE) and the light extraction efficiency (LEE). Although the IQE of GaN-based LEDs has reached more than 80% due to the rapid development of growth techniques for high-quality epi-layers, the LEE of the LEDs is still low because of the large refractive index difference between the GaN (nGaN=2.5) and air (nair=1). Herein, various polygon shaped(triangle, parallelogram, pentagon, hexagon, circle shaped) LEDs are compared with those of a traditional quadrangular LED to enhance LEE of LED. To estimate the enhancement of LEE, we simulated the various shaped LEDs with ray-trace simulation tools. In addition, to measure the total amount of photons emitted from LEDs in all directions, the various polygon LEDs were encapsulated and packaged with To-can. Their optical output power of polygonal shaped LED is significantly improved, compared to that of traditional quadrangular LED due to increase in LEE along to lateral direction.

2015-12-31T15:00:00Z