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        • KCI등재

          Effects of Supplementary LED Lighting on Growth and Biochemical Parameters in Dieffenbachia amoena ‘Camella’ and Ficus elastica ‘Melany’

          허정욱,전창후,이용범,김동억,장유섭 한국원예학회 2010 원예과학기술지 Vol.28 No.1

          To verify the possibility of LEDs as supplementary lighting sources for greenhouse production of foliage plants, growth and development, sugar content, starch content, and chlorophyll and carotenoid contents of potted Dieffenbachia amoena ‘Camella’ and Ficus elastica ‘Melany’ plants were investigated. The plant response varied by monochromatic or mixture of blue and red LEDs and by species. In both species, monochromatic red and supplementation with blue plus red LEDs increased plant height and number of unfolded leaves, while the blue plus red LED treatment promoted the uptake and utilization of nitrogen in Ficus plant. Supplementation with any LEDs did not cause any changes in contents of chlorophyll a and b and total carotenoids. Dry weight and starch content of Dieffenbachia and Ficus and the number of branches in Dieffenbachia increased by supplementation with mixture of blue and red LEDs without any negative effects compared with the control treatment. Results indicate that supplementation with mixture of blue and red LEDs, compared to other light treatments, is beneficial for promotion of growth and development without any negative effects on biochemical characteristics in Dieffenbachia and Ficus.

        • KCI등재

          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.

        • KCI등재

          수용성 식이섬유를 첨가한 요구르트의 기능성 변비개선 효과

          허정욱,박윤아,손승국,이송미,정은주,이강영,김선정,하월규 대한대장항문학회 2007 Annals of Coloproctolgy Vol.23 No.5

          Purpose: Although a diet that is rich in fiber is widely recommended to prevent and treat constipation, the efficacy of fiber supplements with yogurt has not been studied sufficiently. The aim of this study was to evaluate the effect of a yogurt enriched water-soluble fiber on the various symptoms of constipation in female adults with functional constipation. Methods: We did a double-blind and case-controlled study between two groups (placebo vs. fiber group), which were randomly allocated out of 42 subjects with functional constipation by using Rome II criteria. Bowel habits, daily nutritional intakes and physical activities were determined by using a questionnaire, and the segmental colonic transit time was evaluated three times: before treatment, after 4 weeks of treatment, and at the end of the study (2 weeks after treatment). Results: After 4 weeks of treatment, all defecation symptoms tested, except manual evacuation, showed significant improvements in the fiber group; fiber-enriched yogurt increased the number of bowel movements (P=0.002), reduced the presence of hard stools (P=0.001), improved the frequency of straining (P=0.048), the sense of incomplete evacuation (P= 0.013), and the sense of anorectal obstruction (P= 0.032). The total colonic transit time was shortened after intake of fiber-enriched yogurt (P=0.023). Satisfactory relief was significantly higher in the fiber group (P= 0.011). Conclusions: Functional constipation may be improved with water-soluble fiber supplements in yogurt without serious side effects.

        • 발광다이오드를 이용한 광질과 일장조절이 '딕시 화이트' 미니 시클라멘의 개화와 생장에 미치는 영향

          허정욱,이춘우,백기엽 충북대학교 첨단원예기술개발연구센터 2000 연구보고서 Vol.5 No.-

          The study was conducted to investigate the effect of different light qualities and day lengths controlled by using Light-Emitting Diode (LED) of blue, red, or blue plus red provided by LED System on flowering and growth of F1 Cyclamen miniature. Cyclamen persicum 'Dixie White' seedlings which have raised for 170 days after sowing were grown under conditions of 20° C air temperature and 60% relative humidity. Day length was controlled by blue, re, or blue plus red light (1:1 in energy ratio) with 10 or 12 hr for 63 days. Photosynthetic photon flux in the treatments with 10 or 12 hr was about 100 or 83 μmol m-2 s-1, respectively. Fluorescent lamp treatment of 12 hr day length was considered as a control. Flowering and growth in all the treatments were significantly affected by light quality or day length tested in the experiment. Number of flowers, which opened above the leaf canopy, was higher in red light treatment with 10 hr day length than that in control. Days to flowering were the shortest in day length treatment of 10 hr per day with blue plus red light among the treatments. Blooming period was also the longest in red treatment regardless of day length and mixture light treatment, and thus above 20 days prolonged than that in control. Otherwise, number of unfolded leaves or net photosynthetic rate was not significantly affected by the different light qualities and day lengths.

        • 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.

        • 관엽 디펜바키아와 피커스의 생장에 미치는 광질의 영향

          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.

        • KCI등재

          슬관절 인공관절 전치환술 후 일회 주사 내전근관 차단술 및 경피성 Buprenorphine 병합 요법과 도관 삽입 지속적 내전근관 차단술의 임상결과 비교

          허정욱,박만준,고영철,하동준,박준형,이우명 대한정형외과학회 2019 대한정형외과학회지 Vol.54 No.5

          Purpose: To compare the clinical outcomes of single injection adductor canal block (SACB), continuous adductor canal block (CACB), and the concomitant use of transdermal buprenorphine after total knee arthroplasty (TKA). Materials and Methods: A total of 125 patients who underwent TKA were divided into three groups and the clinical results were retrospecitively compared. Group I was comprised of patients with pain controlled by SACB (n=41). Group II consisted of patients with pain controlled by both SACB and transdermal buprenorphine (10 mg/h) (n=44). Group III contained patients with pain controlled by CACB (n=40). The visual analogue scale (VAS) was used as the pain control indicator and the patients were measured on a VAS for resting on the bed (VAS-Rest) at 12 hours, 24 hours, and 48 hours after surgery. The VAS while doing continuous passive motion (VAS-CPM) on the first and second postoperative day was also measured. In addition, the total amount of medications used (Butopahn, Tridol, and Ketorac) for the intravenous patient controlled analgesia (PCA) was counted for 48 hours after surgery. As the indicator of the functional recovery outcome, the incidence of nausea and vomiting was observed for 48 hours after surgery. The maximum knee joint flexion range and maximum walking distance on the first and second postoperative day, and the total length of stay at the hospital were compared. Results: The VAS-Rest was similar in the three groups at 12 hours after surgery, but at 24 hours and 48 hours after surgery, group II and III a lower VAS-CPM and total amount of medications used for PCA than group I (p<0.05). The three groups showed a low incidence of nausea and vomiting, maximum knee joint flexion range, and similar walking distance and total length of stay at the hospital. Conclusion: The combination of SACB and transdermal buprenorphine has great pain control effect initially. On the other hand, it is not associated with catheter complications and it is convenient to use and safety toward the renal function. Therefore, the concomitant use of SACB and transdermal buprenorphine can be an effective pain control method after TKA. 목적: 슬관절 인공관절 전치환술(total knee arthroplasty, TKA) 시행 후 일회 주사 내전근관 차단술(single injection adductor canal block, SACB), 지속적 내전근관 차단술(continuous adductor canal block, CACB), 그리고 경피성 buprenorphine 병합 사용을 통한 임상결과를 비교하였다. 대상 및 방법: TKA 후 통증 조절을 시행한 125명의 환자들을 대상으로 SACB를 단독 시행한 I군(41명), SACB 및 경피성 buprenorphine 10 mg/h를 병합 사용한 II군(44명), CACB를 시행한 III군(40명)으로 분류하여 임상결과를 후향적으로 비교하였다. 통증 조절 지표로 visual analogue scale (VAS)을 사용하였으며, 술 후 12시간, 24시간, 48시간째 침상 안정 상태에서의 VAS (VAS-Rest)와 술 후 24시간 및 48시간째 continuous passive motion (CPM) 중 VAS (VAS-CPM), 그리고 술 후 48시간 동안 정맥주사 patient controlled analgesia (PCA)를 위한 약물(부토판, 트리돌, 케토락)의 사용량을 측정하였다. 기능 개선 지표로 술 후 48시간 동안 오심 및 구토 증상 횟수, 술 후 24시간 및 48시간째 최대 슬관절 굴곡 범위와 최대 자가 보행 거리, 그리고 총 재원 기간을 기록하여 비교하였다. 결과: VAS-Rest는 술 후 12시간째는 유의한 차이가 없었으나 술 후 24시간 및 48시간째와 VAS-CPM, PCA 총 사용량에서 II, III군이 I군보다 유의하게(p<0.05) 더 낮은 결과를 나타내었다. 그리고 오심 및 구토 증상 횟수, 최대 슬관절 굴곡 범위와 자가 보행 거리, 총 재원 기간은 세 군 간의 유의한 차이를 보이지 않았다. 결론: SACB 및 경피성 buprenorphine 병합 사용은 초기 통증 조절에 우수한 결과를 보였으며, 카테터로 인한 문제가 없고, 사용의 편의성 및 신 기능에 대한 안전성이 있기 때문에 TKA 후 유용한 통증 조절 방법이 될 수 있다.

        • KCI등재

          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.

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