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허정욱,이춘우,백기엽 충북대학교 한국과학재단 지정 첨단원예기술개발 연구센터 2002 연구보고서 Vol.6 No.-
이상으로, 발광다이오드를 광원으로 하는 자연광 이용형 보광장치는 광강도가 매우 낮은 장마기와 같은 광환경이 불량한 시기에 적절히 이용하므로서 식물체의 엽면적 증대, 왁스와 같은 특정성분 증량 및 분지등의 생장이나 형태형성에 효과적인 영향을 미칠 수 있는 실용적인 보광시스템으로서의 이용가능성이 검토되었다. 또한, 두종류의 관엽식물에 있어서 약간의 생장 및 형태형성에 있어 상이한 결과를 나타내었으나, 보광을 하지 않은 자연광구에 비하여 저광강도의 발광다이오드를 보광 조사하므로서 두 관엽식물의 생장이나 이상적인 형태형성이 이루어지는 것을 알 수 있었다. 금후, 관엽식물 뿐만 아니라 다른 식물 종을 대상으로 발광다이오드를 광원으로 하는 자연광 이용형 광조사 시스템을 광원으로 하는 연구가 활발히 진 The effect of supplemental lighting providing by Light-Emitting Diodes at daytime on growth of two ornamental plants was investigated. 'Camella' Dieffenbachia amoena and 'Melany' Ficus pumila were grown under different supplemental lights of blue, red, or blue plus red for 50days. The supplemental lights with 30㎛ol m-2 s-1 in photosynthetic photon flux were established in greenhouse which controlled at 27.5℃ air temperature and 75% relative humidity in average from 15th June to 4th August. Fresh weight of 'Camella' was the greatest in the supplemental treatment of blue plus red light, although there was no significant difference in dry weight. Higher plant height was shown in the mixture light of blue plus red and in control of natural lighting. The fresh and dry weights of 'Melany' were significantly higher in the mixture treatment than in control without any supplemental light. Number of unfolded leaves of 'Camella' and 'Melany' was increased in the mixture treatment. Net photosynthetic rate (NPR) of 'Camella' was the greatest in the mixturelight and control, and the red alone and mixture light treatments gave the highest NPR in 'Melany'. Wax content per leaf of blue plus red treatment in 'Melany' was significantly higher than in control.
Current Status of “Watch-and-Wait” Rectal Cancer Treatment in Asia-Pacific Countries
허정욱,Kotaro Maeda,Zheng Liu,Xishan Wang,April Camilla Roslani,이우용 대한대장항문학회 2020 Annals of Coloproctolgy Vol.36 No.2
Purpose: Current acceptance of the watch-and-wait (W&W) approach by surgeons in Asia-Pacific countries is unknown. An international survey was performed to determine status of the W&W approach on behalf of the Asia-Pacific Federation of Coloproctology (APFCP). Methods: Surgeons in the APFCP completed an Institutional Review Board-approved anonymous e-survey and/or printed letters (for China) containing 19 questions regarding nonsurgical close observation in patients who achieved clinical complete response (cCR) to neoadjuvant chemoradiotherapy (nCRT). Results: Of the 417 responses, 80.8% (n = 337) supported the W&W approach and 65.5% (n = 273) treated patients who achieved cCR after nCRT. Importantly, 78% of participants (n = 326) preferred a selective W&W approach in patients with old age and medical comorbidities who achieved cCR. In regard to restaging methods after nCRT, the majority of respondents based their decision to use W&W on a combination of magnetic resonance imaging results (94.5%, n = 394) with other test results. For interval between nCRT completion and tumor response assessment, most participants used 8 weeks (n = 154, 36.9%), followed by 6 weeks (n = 127, 30.5%) and 4 weeks (n = 102, 24.5%). In response to the question of how often responders followed-up after W&W, the predominant period was every 3 months (209 participants, 50.1%) followed by every 2 months (75 participants, 18.0%). If local regrowth was found during follow-up, most participants (79.9%, n = 333) recommended radical surgery as an initial management. Conclusion: The W&W approach is supported by 80% of Asia-Pacific surgeons and is practiced at 65%, although heterogeneous hospital or society protocols are also observed. These results inform oncologists of future clinical study participation.
면광원을 이용한 LCD 백라이트의 저온구동특성 향상을 위한 인버터 개발
허정욱,임성규,Hur, Jeong-Wook,Lim, Sung-Kyoo 한국마이크로전자및패키징학회 2007 마이크로전자 및 패키징학회지 Vol.14 No.1
수은의 방전을 이용하는 CCFL, EEFL, FFL은 그 특성상 상온에서의 구동 특성과 저온에서의 구동 특성이 매우 다르며, 그 결과 수은 증기압이 충분하지 않은 저온에서 구동 시 완전 점등하지 못하고 램프별로 또는 방전 채널별로 불 균일 점등이 발생할 수 있다. 이러한 저온 시동의 어려움을 해결하기 위해, 본 논문에서는 Level Control Block (LCB) 를 포함하는 인버터를 이용하여 저온 $-20^{\circ}C$에서 최대 130 Watt로 제한된 입력전력을 이용하여 외부 전극형 면광원 램프를 이용한 LCD 백라이트가 안정되게 동작될 수 있음을 확인하였다. The CCFLs, EEFLs and FFLs use mercury and the operating conditions are different at warm or cold temperature. At start of operation, there may exist a possibility of inhomogeneous operation of lamps or channels of FFL to the very low vapor pressure of mercury at low temperature. In this paper, an inverter with level control block (LCB) was developed to drive LCD backlight using FFL stably at low temperature range. The operation of FFL backlight at $-20^{\circ}C$ was successfully demonstrated by developing inverter with LCB under 130 Watt of power consumption.
형광등과 발광다이오드의 혼합광 조사가 아게라텀, 메리골드 및 살비아 실생묘의 생장 및 형태형성에 미치는 영향
허정욱,이춘우 충북대학교 첨단원예기술개발연구센터 1999 연구보고서 Vol.4 No.-
One of the factors to decide seedling quality has been known to control the plant height on production of plug seedlings. The growth inhibitor, physical stimulation, or DIF technique for controlling the plant height was commonly used. The experiment was conducted by mixing light with fluorescent lamps and Blue, Red, and Far-red Light-Emitting Diodes (LEDs) as a light source to investigate the effects of light quality on the growth and morphogenesis of flowering plants. Ageratum (cv. Blue Field), Marigold (cv. Orange Boy), and Salvia (cv. Red Vister) plants which developed with two true leaves were placed for 70 days in growth chamber, where air temperature and relative humidity were maintained at 25℃ and 70%, respectively. Photosynthetic photon flux on the culture shelf was kept at 10 μmol m-2 s-1, and photoperiod was provided at 16 h per day. In FL+Blue, FL+Red, and FL+Far-red treatments, total dry weight of Salvia plants was above 2 times greater than in FL treatment. Plant height of the flowering plants was the tallest in mixing light treatment with fluorescent lamp (FL) and Far-red LED. The plant height in all the plants was not significantly different between the FL treatment and the mixing light treatment with FL and Red LED. Number of flowers in Marigold and Salvia plants was not significantly different in all the treatments. Flowering rate of Ageratum plants on day 70 was 100% in all the treatments regardless of light qualities, although Marigold plants never bloomed in FL+Blue and FL+Far-red treatments during the culture period.