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- 저자 : Hao Wei(위호) (검색결과 2 건)
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Effect of Relative Humidity on Physiology and Antioxidant Metabolism of Grafted Watermelon Seedlings
Hao Wei(위호),Abinaya Manivannan,Sowbiya Muneer,SooHoon Kim(김수훈),Liu Ya(유아),Ji Eun Park(박지은),Byoung Ryong Jeong(정병룡) (사)한국생물환경조절학회 2016 생물환경조절학회지 Vol.25 No.4
본 연구는 수박 접목묘의 활착에 미치는 상대습도의 영향을 알아보고자 수행하였다. 2품종(‘스피드’, ‘삼복꿀’)의 수박(Citrullus vulgaris Schrad.)을 ‘RS-동장군’ 박 대목(Lagenaria siceraria Stanld.)에 접목하고, 접목묘는 주간 25℃/야간 18oC, 광주기는 1일 16시간 기준으로 몰리어다이어그램을 따라 3수준의 상대습도, 95-96%[1.1-0.8(주간) 또는 0.8-0.6(야간) g·m<SUP>-3</SUP>수분부족분(VPD)], 97-98%[0.7-0.4(주간) 또는 0.5-0.3(야간) g·m<SUP>-3</SUP> VPD], 또는 99-100%[0.3-0.0(주간) 또는 0.2-0.0(야간) g·m<SUP>-3</SUP> VPD]로 유지하였다. 상대습도 처리 중 97-98% 처리는 대목과 ‘스피드’ 접수의 생체중과 초장을 가장 크게 증가시키며 접목 2일 후에 접합부의 연결을 향상시켰다. 그러나 ‘삼복꿀’의 경우 상대습도 99-100% 처리에서 경경과 초장이 증가하였다. 또한 상대습도 95-96%와 97-98% 처리에서 재배한 2 품종 모두 과산화수소가 덜 발생하고 산화적 스트레스의 지표인 항산화 효소의 활성이 덜 나타났다. 따라서 이 연구의 결과는 수박묘의 접목활착에 가장 적절한 상대습도는 97-98%였다. This study investigated the effect of different relative humidity (RH) regimes on graft healing of grafted seedlings of watermelon (Citrullus vulgaris Schrad.). Two watermelon cultivars (‘Speed’ and ‘Sambok Honey’) were grafted onto the ‘RS-Dongjanggun’ bottle gourd rootstock (Lagenaria siceraria Stanld.) and the grafted seedlings were maintained under one of three relative humidity regimes, 95-96% [1.1-0.8 (day) or 0.8-0.6 (night) g·m<SUP>-3</SUP> vapor pressure deficit (VPD)], 97-98% [ 0.7-0.4 (day) or 0.5-0.3 (night) g·m<SUP>-3</SUP> (VPD)], or 99-100% [0.3-0.0 (day) or 0.2-0.0 (night) g·m<SUP>-3</SUP> (VPD)] according to the Mollier diagram based on the air temperature of 25℃ day/18℃ night with 16 h photoperiod per day. Among the RH treatments, 97-98% significantly increased plant height and fresh weight of the rootstock and scion of the ‘Speed’ and it also enhanced the graft union connection of both cultivars after two days of grafting. However, plant height and thickness of the scion of ‘Sambok Honey’ was increased by the 99-100% RH treatment. Furthermore, both cultivars grown in the 95-96 and 97-98% RH treatments consisted of lower levels of endogenous H₂O₂ and less activities of antioxidant enzymes which illustrated the occurrence of less oxidative stress. Hence, the results of this study identified the optimal RH level for the graft healing of watermelon seedlings.
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PAPR Reduction Using Hybrid Schemes for Satellite Communication System
김재명,조자빈,이호위,손성환,Kim, Jae-Moung,Zhao, Zibin,Li, Hao-Wei,Sohn, Sung-Hwan Korea Society of Satellite Technology 2008 한국위성정보통신학회논문지 Vol.3 No.2
In the future, satellite communication systems, such as ISDB in Japan and DVB in Europe, are required to support higher transmission date rate for providing multimedia services including HDTV, high rate data communication etc. Considering the effectiveness of OFDM technique in efficient usage of frequency bandwidth and its robustness to the multi-path fading, several OFDM based standards have been proposed for satellite communication. However, the problem of high Peak to Average Power Ratio is one of the main obstacles for the implementation of OFDM based system. Many PAPR reduction schemes have been proposed for OFDM systems. Among these, the partial transmit sequences (PTS) is attractive as they obtain better PAPR property by modifying OFDM signals without distortion. In this paper, considering the complexity issue, we present a simplified minimum maximum (minimax) criterion and Sub-Optimal PTS algorithm to optimize the phase factor. This algorithm can be dynamically made tradeoff`f between performance and complexity on demand. In addition, we integrate guided scrambling (GS) with this method. Simulation in multiple antenna based OFDM system proves that the proposed Hybrid schemes can get much more PAPR reduction and do not require transmission of side information (SI). Thus it is helpful when implementing OFDM technique in satellite communication system.
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