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Oxide층의 두께와 위치 조절을 통한 oxido-VCSEL의 단일모드 동작반경 확장
김남길,김상배 대한전자공학회 2004 電子工學會論文誌-SD (Semiconductor and devices) Vol.41 No.9
oxide 층의 위치와 두께 조절을 통하여 oxide-VCSEL이 단일모드로 동작하는 활성영역의 반경을 확장하는 방법을 Self-consistent effective-index 방법을 이용하여 제시하였다. 이렇게 활성영역이 넓어지면 고속, 고신뢰도, 고출력 동작에 유리한 단일모드 VCSEL을 만들 수 있게 된다. 고출력을 위하여 단일모드로 동작하는 활성영역을 확대하는 방법을 하면 다음과 같다. 첫째 oxide 층은 활성층에서 멀리 떨어진 곳에 위치시켜야 한다 둘째, oxide 층은 얇게 만들어야 한다. 셋째, oxide층을 node에 위치시켜야 한다. 그리고 고출력을 위하여 p-DBR 쌍의 수를 줄이는 것은 단일모드 동작조건을 변화시키지 않는다. 이 방법을 사용하면 단일모드로 동작하는 oxide-aperture 크기를 3m% 이상 키울 수 있다. We have proposed a design methodology for large active-area single-mode VCSELS, which have higher reliability and output power, and are well-suited for high-speed operation. The key idea underlying the design methodology is to reduce the effective index difference between active and cladding regions by controlling the thickness and position of the oxide layer. The idea is confirmed by the self-consistent effective index method. By placing the oxide layer position properly, we can increase the radius of the oxide aperture for single-mode operation by 3 times.
Life history of Porphyra seriata Kjellman ( Bangiales, Rhodophyta) from Korea in culture
김남길,Masahiro Notoya 한국조류학회I 2004 ALGAE Vol.19 No.4
The laboratory culture study of Porphyra seriata Kjellman from Korea was conducted at different conditions of temperatures (5, 10, 15, 20, 25 and 30C), photon flux densities (10, 20, 40 and 80 ?mol m-2 s-1) and photoperiods (14L: 10D and 10L:14D). Conchocelis filaments grew fast at 15-20C and 20-80 ?mol m-2 s-1 under both photoperiods. Conchosporangial branches were produced at 5-25C, and abundant when the conchocelis filaments were cultured at higher temperatures of 20-25C under both photoperiods. Foliose thalli grew well at 15-20C under 10L:14D and at 20C under 14L:10D. At 30C, the foliose thallus failed to survive. No archeospores were observed at any culture conditions. Spermatangia and zygotosporangia were formed in squarish patches at the upper marginal portion of mature thalli. Anatomical examination revealed that the mature spermatangia were 64 (a/4, b/2, c/8) and 128 (a/4, b/4, c/8), and that of zygotosporangium was 16 (a/2, b/2, c/4) according to the Hus' formula.
김남길 한국조류학회I 2011 ALGAE Vol.26 No.1
Physiological studies on the hybrid by crossing between two dioecious species, Porphyra pseudolinearis and P. dentata from Korea were conducted at constant temperatures (5, 10, 15, 20, and 25°C), at photon flux densities (10, 20, 40, and 80 μmol m^(-2) s6(-1)) under photoperiods (14 L : 10 D and 10 L : 14 D). In the hybrid, higher growth of conchocelis was observed at 20 and 40 μmol m6(-2) s^(-1) under 14 L : 10 D. Conchosporangial branches were produced under 10-80 μmol m6(-2) s6(-1) at only 25°C, and were abundant when the conchocelis was cultured under 10 L : 14 D. Foliose thalli of the hybrid grew well at the conditions of 10-20°C, 10 L : 14 D and 15-20°C, 14 L : 10 D. The foliose thalli grew very slowly at 5°C and 30°C, respectively. No archeospores were observed at any culture conditions. Spermatangial and zygotosporangial sori were formed at the marginal portion of mature thallus. Zygotospores from the hybrid were released at 10-20°C under both photoperiods, and gave rise to form conchocelis filament. Monoecious thalli were observed at 10°C under 14 L : 10 D. Neither monospores nor protothalli were produced from the conchocelis in culture.