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백색 및 청색 방풍망 차광 처리가 ‘후지’, ‘홍로’ 사과 과실의 품질에 미치는 영향
강경진(Kyeong-Jin Kang),서정학(Jeong-Hak Seo),윤홍기(Hong-Ki Yoon),서정석(Jeong-Seok Seo),주정일(Jung-Il Joo),천종필(Jong-Pil Chun) (사)한국생물환경조절학회 2020 시설원예‧식물공장 Vol.29 No.2
본 연구는 ‘후지/M.9’와 ‘홍로/M.9’가 재식된 사과원에 바람이나 우박을 막기 위해 사용되는 망(구멍 크기 : 2×2mm)을 수관상부에 색상별로 백색과 청색을 나누어 설치한 후 햇빛의 차광정도 및 생육환경 차이 등에 따른 과실품질 변화를 조사하였다. ‘후지’ 사과의 경우 대기온도 34.8℃인 오후 2~3시경의 과실표면 온도를 측정한 결과, 무처리는 40.0℃로 가장 높았고, 청색 방풍망과 백색 방풍망 처리구는 각각 34.9℃, 36.6℃로 크게 낮았다. ‘홍로’에서는 무처리구가 44.2℃일 때, 청색 방풍망 처리구는 38.3℃, 백색 방풍망 처리구는 38.5℃를 기록하여 ‘후지’와 마찬가지로 온도 경감효과를 보였다. ‘후지’의 과피색차를 조사한 결과, 과피적색도(a*)는 무처리구가 16.5, 청색 방풍망 처리구는 18.0였으나, 백색 방풍망 처리구는 19.3으로 가장 높은 값을 보였다. ‘홍로’에서도 백색방풍망 처리구가 적색도가 34.9로 무처리구 28.1에 비해 유의하게 높은 적색도 발현을 보였다. 일소피해 조사결과, ‘후지’에서 청색 방풍망 처리구 3.8%, 백색 방풍망 처리구 4.2%로 무처리구 9.4%에 비하여 크게 경감되었고, ‘홍로’의 경우는 청색 방풍망 처리구는 8.8%, 백색 방풍망 처리구는 12.4%로 무처리구 28.8%에 비하여 일소발생이 현저히 감소하였다. 이 같은 결과는 처리별 자외선 수치를 측정하였을 때 무처리 구간의 자외선 값에 비해 청색 방풍망 처리구에서 유의하게 낮아 방풍망 처리에 의한 자외선 차단 효과에 의한 것을 확인할 수 있었다. In Yesan-gun, Korea"s main apple-producing region, the area of apple cultivation and yield are declining. In particular, the worsening quality of fruits due to unusually high temperatures amid recent climate change has also become a major challenge for apple orchards located on flatlands. The objective of this research is to investigate quality changes of apples according to different growing environments, depending on the shade of the sun, by covering the trees with different colors of wind nets. A white and blue wind nets with a hole size of 2 × 2 mm is installed on two experimental trees, 17-year-old ‘Fuji’ and ‘Hongro’, which are planted 1.5 m × 3.5 m in the north-south direction. Treatment of wind nets effectively lowered fruit surface temperature regardless of apple variety. When measuring the temperature of the fruit surface at 2 pm, the temperature of the air was 34.8°C, but the ‘Fuji’ of the untreated blocks was the highest at 40.0°C, while the blue wind net and the white wind net were significantly lower at 34.9°C and 36.6°C, respectively. In ‘Hongro’, the results showed that the surface temperature was effectively lowered by recording 38.3°C for the blue wind net and 38.5°C for the white wind net treatment when the untreated one was 44.2°C. According to the color difference in ‘Fuji’, the skin redness (a*) was the lowest with untreated control at 16.5, but the blue and white wind net treatment higher at 18.0 and 19.3, respectively. In ‘Hongro’, the white wind net treated fruit also showed a much higher skin redness than the untreated control of 28.1, showing much higher a* of 34.9. Sunburn damage in ‘Fuji’ apples amounted to 9.4% in untreated control. However, the blue and white wind net treatment revealed to 3.8% and 4.2%, respectively. In ‘Hongro’, those damage in the fruits treated with blue or white wind net, accounted for only 8.8% and 12.4%, respectively, significantly lower than 28.8% occurrence of untreated one. And, these results were understood to be the result of low UV radiation being blocked by the treatment of wind nets.
강경인(Kang Kyeong In),김정일(Kim Jeong Il),정근원(Jeong Keun Won),이광배(Lee Kwang Bae),김현욱(Kim Hyen Ug) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.3
In this paper, we propose a new algorithm to perform DCT(Discrete Cosine Transform) within the area reduced by predicting position of quantization coefficients to be zero. This proposed algorithm not only decreases the encoding time and the decoding time by reducing computation amount of FDCT(Forward DCT) and IDCT(Inverse DCT) but also increases compression ratio by performing each different horizontal-vertical zig-zag scan according to the classified block size for each block on the huffman coding. Traditional image coding method performs the same DCT computation and zig-zag scan over all blocks, however this proposed algorithm reduces FDCT computation time by setting to zero instead of computing DCT for quantization coefficients outside classified block size on the encoding. Also, the algorithm reduces IDCT computation time by performing IDCT for only dequantization coefficients within classified block size on the decoding. In addition, the algorithm reduces Run-Length by carrying out horizontal-vertical zig-zag scan appropriate to the classified block characteristics, thus providing the improvement of the compression ratio. On the other hand, this proposed algorithm can be applied to 16*16 block processing in which the compression ratio and the image resolution are optimal but encoding time and the decoding time take long. Also, the algorithm can be extended to motion image coding requiring real time processing.
김형수,강경복,임원일,이은구,Hyung-Su Kim,Kyeong-Bok Kang,Won-IL Rhim,Eun-Koo Lee 대한안과학회 2007 대한안과학회지 Vol.48 No.8
Purpose: To report two cases of ocular ischemia following scleral encircling. Methods: A 21-year-old man with glaucoma and a 76-year-old woman without any medical problem were transferred to our department for surgery to treat retinal detachment. After retrobulbar anesthesia and limbal peritomy of conjunctiva, the 4-rectus muscles were isolated. Scleral encircling was performed with No. a 42 band (4.0 mm in width) after cryotherapy done completely around retinal tear. Results: Following surgery, One patient experienced ophthalmic artery occlusion and while the other patient experienced central retinal artery occlusion. Vision was not restored in either cases despite IV injection of 250 ml of 15% mannitol solution and anterior chamber paracentesis. Conclusions: In the cases where patients are of old age or suffer from glaucoma, we strongly recommend that the surgeons perform the scleral encircling carefully.