AMOLED 불량 및 신뢰성 평가

양중환,윤종근,Yang, Jung-Hwan,Yun, Jong-Geun 한국정보디스플레이학회 2007 인포메이션 디스플레이 Vol.8 No.5

커피나무 분화 생산을 위한 여름철 적정 광도 및 동절기 최저 온도

윤재길,양중환,안상열,박재춘,이영미 한국화훼산업육성협회 2007 화훼연구 Vol.15 No.4

커피나무를 실내분화로 개발할 목적으로 광도에 따 른 생육반응과 겨울철 온도관리에 대한 실험을 수행한 결과는 다음과 같다. 50% 차광망으로 0~3겹까지 차광 하여 생육을 조사한 결과, 1겹과 2겹에서 생육이 가장 양호하고 엽색도 진한 녹색이며 잎에 광택이 있어 관 상가치도 가장 높은 것으로 나타났다. 3겹 차광에서는 엽색은 진하나, 생육이 지나치게 억제된 결과를 보였으 며, 무차광에서는 엽색이 탈색되고 생육도 현저하게 저 하되었다. 겨울철에 최저 온도를 5, 10, 15, 20oC로 설정하고 커피나무를 관리한 결과, 15oC 이상에서 정 상적인 생육이 가능했으며, 엽색도 진한 녹색으로 관상 가치가 높게 나타났다. 그러나 10oC에서는 생육이 현 저하게 저하되었고, 5oC에서는 생육저하뿐 아니라 일 부 개체는 저온피해로 고사되었다. 따라서 커피나무를 분화로 재배하고자 할 때는 50% 차광망으로 2겹이 가장 좋으며, 겨울철 야간 최저 온도는 15oC이라고 판단되었다. To develop coffee tree (Coffea arabica) as an ornamental potted plant, growth responses as affected by level of shading in summer and minimum temperature in winter were investigated. The plant was shaded with 0~3 layers of a 50% shading net. Potted plant cultured under 1 or 2 layers of the shading net showed the best growth and commercial value with dark greenish leaves. Three layers of the shading net inhibited the plant growth, although plants had dark greenish leaves. Plants under 0 layer of the shading net showed distinct suppression in growth and degradation in commercial value with discolored leaves. Night minimum temperature in winter was set at 5, 10, 15 or 20oC in a plastic greenhouse. Plants in 15 and 20oC conditions showed normal growth and high commercial value with greenish leaves. Inhibition in growth was apparent in a 10oC condition. Under a 5oC condition, 10~20% plants died by cold injury. In conclusion, in order to culture the coffee tree as an ornamental potted plant, two layers of 50% shading net during summer and minimum temperature above 15oC in winter would be recommended.

커피나무의 분화 생산을 위한 적정 용토 및 액비 농도

윤재길,양중환,채윤석,이상우,정병룡 한국화훼산업육성협회 2007 화훼연구 Vol.15 No.4

커피나무(Coffea arabica L. ‘Blue Mountain’)의 분화 관상식물로 개발할 목적으로 적정 용토와 액비농 도를 구명하기 위한 실험을 수행하였다. 분용토 선발을 위하여 토실이상토, 폐암면입자+ 일반상토, 폐암면입 자+ PUR(스펀지)입자, 폐암면입자+ 목재칩, 그리고 일반상토를 이용하여 약 3개월간 재배한 결과, 초장 및 수관폭 등 생육지표에서 폐암면입자+ 일반상토와 폐암면입자+ PUR입자가 가장 좋았다. 엽록소와 엽색 에서 토실이상토, 폐암면입자+ 일반상토, 그리고 폐암 면입자+ PUR입자에서는 진한 녹색으로 관상가치가 높았으나, 폐암면입자+ 목재칩과 일반상토구에서는 녹 색이 엷어져 상품성이 많이 떨어졌다. 적정 액비 농도 를 구명하기 위해 Hyponex를 2000, 1000, 500배 희석액으로 1회/주 살포한 결과, 1000배 희석액까지는 뚜렷한 차이가 보이지 않았으나 500배 희석액에서는 생육이 더 좋고 엽색도 진한 녹색으로 상품가치가 더 좋은 것으로 나타났다. 결론적으로 폐암면입자에 일반 상토나 PUR입자를 혼합하여 사용하고 Hyponex 500 배 희석액을 주 1회 관주하면 좋은 품질의 커피나무 분화를 생산할 수 있을 것으로 판단되었다. Selections of an adequate potting medium and a nutrient concentration were conducted to produce coffee tree (Coffea arabica L. ‘Blue Mountain’) as an ornamental potted plant. A commercial medium (Tosilee medium), waste rockwool particles (WRW), mixed soil (MS), WRW+mixed soil (MS), WRW+PUR chips (SC), and WRW+woodchips (WC) were used as the growing media. Growth indexes, such as plant height and canopy, were the best in WRW+MS and WRW+SC. In both media, chlorophyll content was the greatest and leaf color was more greenish with a high commercial value. On the contrary, chlorophyll content was low and leaf color was yellowish in both WRW+WC and MS treatments. To select an adequate nutrient concentration, plants were fed with 2000, 1000 and 500 times diluted solutions of Hyponex (N:P:K=5:10:5) once a week. There was no significant difference in growth of the plant among the control, 2000 and 1000 times diluted solutions. Hyponex diluted at 500 times showed better growth and leaf color than other treatments.

조산아에서 조직학적 융모양막염이 호흡곤란 증후군 및 만성 폐질환의 발병에 미치는 영향

신충호,양세원,조희승,김병일,최창원,박준동,김종재,최중환 대한소아청소년과학회 2004 Clinical and Experimental Pediatrics (CEP) Vol.47 No.2

목 적 : 조직학적 융모양막염이 조산아의 호흡곤란 증후군과 만성 폐질환의 발병에 영향을 미치는 독립적인 선행인자로 작용하는지를 알아보고자 연구를 시행하였다.방 법 : 1993년 1월부터 2000년 12월까지 8년간 서울대학교병원에서 출생하여 신생아중환자실에 입원한 환아중에서 재태주령 34주 이하의 조산아는 모두 604명이었다. 이들 중 산모가 임신중의 당뇨나 기타 내분비계 질환이 있거나, 환아가 심한 선천성 기형, 태아수종, 선천성 내분비 질환, 선천성 TORCH 감염으로 확인된 경우(N=39)와 태반의 조직학적 검사가 이루어지지 않은 87명을 제외한 총 478명을 연구대상으로 하였다. 조직학적 융모양막염이 조산의 발생, 조산아의 호흡곤란 증후군, 만성 폐질환에 영향을 미치는지 후향적으로 분석하였다.결 과 : 조직학적 융모양막염이 없는 군[CA(-)]은 268례(56 %), 조직학적 융모양막염이 있는 군[CA(+)]은 210례(44%)였다. 재태주령은 CA(+) 군에서 유의하게 낮았고(31+1±2+2주 vs. 30+1±2+3주), 출생체중은 두 군간의 차이가 없었다. CA(+) 군에서 호흡곤란 증후군의 발병이 줄어들고(38.4% vs. 28.1%), 만성 폐질환의 발병은 높아지며(7.5% vs. 13.3%), 비전형적인 만성 폐질환이 많은 부분을 차지하였다(10.5% vs. 55.6%). 다변량 로지스틱 회귀분석을 통하여 조직학적 융모양막염은, 호흡곤란 증후군[odds ratio, OR 0.35(P=0.0004, 95% confidence intervals, CI 0.19-0.63)], 만성폐질환[OR 1.95(P=0.047, 95% CI 1.01-3.79)]의 발생에 영향을 미치는 하나의 독립적인 인자로 작용함을 확인하였다. 그밖에도 동맥관개존(33.3% vs 25.4%)이 CA(+) 군에서 유의하게 낮았다[OR 0.37(P=0.003, 95% CI 0.19-0.71)]. 폐외공기누출, 폐출혈, 총 입원기간 및 자의퇴원이나 퇴원시의 사망 여부는 두 군간의 차이가 없었다.

양돈 슬러리에 첨가된 발효탄수화물의 종류별 악취물질 농도 비교

황옥화,양승학,전중환,곽정훈,최동윤,양승봉,김두환,조성백,Hwang, Ok Hwa,Yang, Seung Hak,Jeon, Jung Hwan,Kwag, Jeong Hoon,Choi, Dong Yun,Yang, Seung Bong,Kim, Doo Hwan,Cho, Sung Back 한국축산환경학회 2013 한국축산시설환경학회지 Vol.19 No.1

Slurry treatments included peanut shell, palm golden fiber, almond hull, which was added 2% of the amount of slurry, and non-treatment control (n=4 each group). Levels of odorous compounds were measured from the liquid slurry incubated in $20^{\circ}C$ for 2 wk in chamber whose structure is similar to slurry pit. Concentration of phenols and indoles was higher (p<0.05) in control (48.4, 4.0 ppm) compared to almond hull (31.5, 1.4 ppm) or palm golden fiber (29.1, 1.6 ppm) group. Short chain fatty acid (SCFA) level was lowest (p<0.05) in control (2,121 ppm) but highest in peanut shell group (3,640 ppm). Branched chain fatty acid (BCFA) concentration was highest (p<0.05) in peanut shell (296 ppm), but lowest in almond hull (90 ppm). Taken together, concentration of odorous compounds was decreased by addition of almond hull in pig slurry by which crude fiber and non-digestible fiber (NDF) may act as a carbon source.

Filter Paper 법에 의한 소아의 정상 혈청 TSH 치에 관한 연구

송재원,이종린,양세원,최중환,윤종구,문형로,조보연,고창순 대한핵의학회 1987 핵의학 분자영상 Vol.21 No.1

High Incidence of Thyroid Dysfunction in Preterm Infants

정혜림,신충호,양세원,최창원,김병일,김이경,김한석,최중환 대한의학회 2009 Journal of Korean medical science Vol.24 No.4

To determine the validity of a repeat thyroid function test for preterm infants, and to investigate factors that influence thyroid function of preterm infants, thyroid functions of 105 infants born at <32 weeks’ gestational age were evaluated. Initial serum free thyroxine (fT4) and thyrotropin (TSH) levels were measured during the first 10 days of life, and repeated tests were performed more than 2 weeks apart. We analyzed the effects of gestational age, systemic diseases, and nutrition on the development of thyroid dysfunction. Thirty-one infants (30%) had low fT4 levels (<0.7 ng/dL) in the absence of elevated TSH levels (<7 μU/mL). Thirteen infants (12%) had hypothyroidism (fT4 <0.7 ng/dL, TSH ≥10 μU/mL) and mean age at diagnosis was 28±17 days. Twelve infants had moderately elevated TSH (TSH 10-30 μU/mL) with normal fT4 levels after 1 week of postnatal life. The history of undergone surgical procedure which needed iodine containing disinfectants was significantly frequent in the infant with hypothyroidism and transient TSH elevation. Repeated thyroid function tests are necessary for preterm infants, even though they initially show normal thyroid function, and are especially important for infants who have been exposed to excessive or insufficient levels of iodine.

미숙아에서의 선천 부신 과형성에 대한 선별검사의 해석

정혜림,신충호,양세원,윤경아,이영아,박소은,최창원,김병일,최중환,송정한 대한소아청소년과학회 2008 Clinical and Experimental Pediatrics (CEP) Vol.51 No.6

Purpose:This study was undertaken to identify factors that influence 17-OHP levels in preterm infants and to suggest a reasonable follow-up schedule of screening for congenital adrenal hyperplasia (CAH) in preterm infants. Methods:The 17-OHP concentrations in filter paper blood spots of 427 preterm infants were obtained. The effects of gestational age (GA), systemic diseases, and antenatal dexamethasone on screening and follow-up 17-OHP values were investigated. Results:The screening 17-OHP values were markedly variable (range: 0.1-143.3 ng/mL). The screening 17-OHP levels were negatively correlated with GA (r=-0.535, P<0.01). In infants with GA <32 weeks, the screening 17-OHP levels were significantly higher in sick infants or infant with hypotension than in healthy infants. The screening values of prenatal dexamethasone-treated infants had a tendency to be low. In infants with initial 17-OHP values ≥20 ng/mL, the intervals until rescreening 17-OHP <10 ng/mL or serum 17-OHP <20 ng/mL were negatively correlated with GA (r=-0.541, P<0.01) and were prolonged in infants with bronchopulmonary dysplasia (P<0.01). None of the preterm infants were confirmatively diagnosed with CAH. Conclusion:The 17-OHP values of preterm infants were influenced by GA, prenatal dexamethasone, and postnatal diseases. Because the 17-OHP values of preterm infants were markedly variable, a follow-up schedule should be developed considering both 17-OHP values and clinical status. (Korean J Pediatr 2008;51:616-621) Purpose:This study was undertaken to identify factors that influence 17-OHP levels in preterm infants and to suggest a reasonable follow-up schedule of screening for congenital adrenal hyperplasia (CAH) in preterm infants. Methods:The 17-OHP concentrations in filter paper blood spots of 427 preterm infants were obtained. The effects of gestational age (GA), systemic diseases, and antenatal dexamethasone on screening and follow-up 17-OHP values were investigated. Results:The screening 17-OHP values were markedly variable (range: 0.1-143.3 ng/mL). The screening 17-OHP levels were negatively correlated with GA (r=-0.535, P<0.01). In infants with GA <32 weeks, the screening 17-OHP levels were significantly higher in sick infants or infant with hypotension than in healthy infants. The screening values of prenatal dexamethasone-treated infants had a tendency to be low. In infants with initial 17-OHP values ≥20 ng/mL, the intervals until rescreening 17-OHP <10 ng/mL or serum 17-OHP <20 ng/mL were negatively correlated with GA (r=-0.541, P<0.01) and were prolonged in infants with bronchopulmonary dysplasia (P<0.01). None of the preterm infants were confirmatively diagnosed with CAH. Conclusion:The 17-OHP values of preterm infants were influenced by GA, prenatal dexamethasone, and postnatal diseases. Because the 17-OHP values of preterm infants were markedly variable, a follow-up schedule should be developed considering both 17-OHP values and clinical status. (Korean J Pediatr 2008;51:616-621)

신생아기에 진단된 Citrullinemia 1례

송승규,오경창,홍미애,김희택,신혜정,김순영,장진근,조희승,김병일,양세원,최중환,Song, Seung Kyu,Oh, Kyung Chang,Hong, Mi Ae,Kim, Hee Taeg,Shin, Hye Jung,Kim, Soon Young,Chang, Jin Keun,Jo, Heui Seung,Kim, Beyong Il,Yang, Sei Won,Choi, J 대한소아청소년과학회 2002 Clinical and Experimental Pediatrics (CEP) Vol.45 No.4

Citrullinemia는 유전성 대사 질환 중 하나로서 argininosuccinic acid synthetase 결손에 의해 발생하는 질병이다. 구토, 기면 또는 보챔, 경련, 의식장애와 같은 증상이 고암모니아혈증에 의해 초래되고 고암모니아혈증을 신속히 치료해야만 비가역적인 뇌손상을 줄일 수 있다. 저자들은 소변 유기산 분석과 혈중 및 요중 아미노산 분석에 의해 citrullinemia 1례를 경험했기에 이에 문헌 고찰과 함께 보고하는 바이다. Citrullinemia is a rare inborn error of metabolism of the urea cycle, and was first reported by McMurray, et al. in 1962. It is inherited as an autosomal recessive trait. The normal synthesis of argininosuccinic acid is blocked in this disease due to a deficiency of argininosuccinic acid synthetase(AS), which has been demonstrated in liver cells and fibroblasts. The clinical symptoms are vomiting, lethargy or irritability, convulsion and mental retardation. The diagnosis is made by the finding of an increased plasma citrulline level. Every effort should be made to reduce the blood ammonia level as rapidly as possible before irreversible brain damage occurs. This report describes a case of citrullinemia that was diagnosed through organic acid analysis and amino acid analysis, and reviews the related literatures.

Photocrosslinkable Carbazole-based Hole Transport Materials for Blue Phosphorescent Organic Light-Emitting Diode

윤승희,엄현아,신지철,이태완,조민주,김영재,손영훈,권장혁,배숙영,양중환,최동훈 한국고분자학회 2013 한국고분자학회 학술대회 연구논문 초록집 Vol.2013 No.10