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메탄올 환원법에 의한 연료전지용 백금담지 전극제조 - 촉매담지시 계면할성제 첨가와 열처리 온도 효과 -
정윤이,유덕영,은영찬,이주성 ( Eun Ey Jung,Duck Young Yoo,Yeong Chan Eun,Ju Seong Lee ) 한국공업화학회 1997 공업화학 Vol.8 No.1
메탄올에 의해 백금을 환원시켜 carbon상에 담지할 때 계면활성제의 첨가가 환원된 백금 colloid의 안정화에 큰 영향을 미치며 계면활성제의 첨가량이 증가할수록 백금 colloid의 안정성이 증가하여 백금을 미립화하여 carbon상에 담지할 수 있었다. 그러나 계면활성제의 양이 증가할수록 열처리 후 잔존하는 계면활성제 잔유물이 전극 내에서 불순물로 작용하여 산소환원 성능은 감소하였다. 계면활성제 제거를 위해 열처리 온도를 증가시킬수록 백금의 응집현상이 크게 증가하여 백금의 입자 크기가 증가하여 전류밀도는 감소하였다. When platinum was impregnated on carbon by methanol, surfactant have an important effect on the stability of platinum colloid. As the increase of amount of surfactant enhanced the stability of platinum colloid, the particle size of platinum on carbon was diminished. But, after heat treatment, residue of surfactant remained in electrode to decrease current density of oxygen reduction. To remove surfactant, as temperature of heat treatment enhanced, platinum paticle was aggromerated and current density was decreased.
에너지 저장 시스템 (ESS)용 배터리의 운전조건에 따른 성능 저하 및 태양광 연계형 ESS 모니터링 연구
정윤이,정한주,정연주,이재영,이홍기 한국수소및신에너지학회 2014 한국수소 및 신에너지학회논문집 Vol.25 No.3
Performance degradation of a battery in 20 kWh energy storage system (ESS) under various operatingconditions was studied. And energy saving of the ESS was also monitored by connecting with 20 kW photovoltaic(PV). PV-connected ESS saved 5~7% of energy consumption in 2013 compared to that without such system in2012. As charge-discharge cycle increased, capacity decreased and the performance degradation was glaringlyobvious after 40 cycles. And as charge and discharge rate increased, the performance degradation was more serious. After 50 charge-discharge cycles, a lot of degraded product was deposited on the surface of anode and cathodeelectrodes, and the cathode side was more contaminated. Therefore, in order to maintain the cell performance,it was more important to protect the degradation of the cathode side.
트리요오드티로닌 자가항체가 동반된 하시모토 갑상선염 1예
정윤이,한정희,이성진,민원기,박기영,박건구,문대혁,안일민 대한내분비학회 2001 Endocrinology and metabolism Vol.16 No.2
Autoantibodies against thyroid hormones can be detected in the sera of patients with both thyroidal and non-thyroidal disorders. These antibodies interfere with the radioimmunoassay of serum total and free thyroid hormone concentrations, resulting in a discrepancy between the measured hormone levels and clinical features. This can in turn lead to an erroneous diagnosis and patients may receive unnecessary treatment from physicians who are unaware of the presence of the autoantibodies. We experienced a woman having Hashimotos' thyroiditis with a spurious elevation of total T_3 and free T_3 values according to one-step analog-tracer radioimmunoassay who was had been treated as Graves' disease in past. Through the use of a polyethylene glycol precipitation method, she was subsequently revealed to have anti-triiodothyronine autoantibodies. We report this case with a review of related literature
정윤이,황혜정 한국보육지원학회 2013 한국보육지원학회지 Vol.9 No.6
본 연구는 유아의 언어표현능력이 친사회적 행동에 미치는 영향을 알아보았다. 대상은 경기도에 있는 9개 유치원 및 어린이집의 만 4세반 유아 44명과 만 5세반 유아 42명, 총 84명이다. 유아의 언어표현력은 장영애(1981)가 만 3-5세 수준에 맞게 제작한 언어표현능력 도구로, 유아의 친사회적 행동은 김영옥(2003)이 개발한 교사용 친사회적 행동 평가 척도(PBSYC)로 측정하였다. 연구 결과, 언어표현능력이 높을수록 친사회적 행동을 많이 보이는 것으로 나타났다. 또한 언어표현능력이 친사회적 행동에 미치는 영향을 보면, 유아의 친사회적 행동에 그림보고 이야기 꾸미기의 하위 요인 중내용의 일치가 통계적으로 유의미한 영향을 미쳤다. 즉 언어표현능력이 뛰어난 유아가 또래와 바람직한 관계를 형성하고, 도움을 주며, 자신의 능력을 활용하여 또래를 배려해 줄 수 있고, 자신의 것을 나누며 감정을 조절하는 데 있어서 그렇지 않은 유아보다 유능하다고 하겠다. 이를 바탕으로 유아의 친사회적 행동을 증진시키기 위해 교사는 유아의 언어표현능력을 증진시킬 수 있는 다양한 교육적 활동을 제공하고 다양한 방법을 활용하여 언어를 지도해야 함을 시사한다.
미세단백뇨를 동반한 인슐린비의존형 당뇨병 환자에서 신장 병리 소견의 다양성
정윤이(Yun Ey Chung),이기업(Ki Up Lee),박중열(Joong Yeol Park),홍성관(Sung Kwan Hong),강재영(Jae Young Kang),이종수(Jong Soo Lee),오영하(Young Ha Oh),정재걸(Jae Gul Chung),유은실(Eun Sil Yu),박정식(Jung Sik Park) 대한내과학회 1998 대한내과학회지 Vol.55 No.5
N/A Objective: It was suggested that the cause of microalbuminuria is heterogeneous in NIDDM. However, only a few studies are available that investigated the renal pathology in NIDDM patients with microalbuminuria. This study was undertaken to evaluate renal pathology in Korean NIDDM patients with microalbuminuria. Methods: Fifty NIDDM patients with microalbuminuria and without retinopathy were undertaken renal biopsy. Renal pathologic findings were classified as follows' group A, near normal finding; group B, typical diabetic nephropathology; group C, atypical patterns of renal injury (mild glomerular change with disproportionally severe tubulointerstitial lesion, arteriolar hyalinosis or global glomerular sclerosis); group D, non-diabetic renal lesion. Results: Seventeen patients were classified into group A, 19 into group B and 8 into group C. Six patients had non-diabetic renal lesions and they were all confirmed to be IgA nephropathy, Fasting blood sugar and GFR were significantly higher in group B than in group A and group C respectively, and systolic blood pressure was higher in group C than in group A. Conclusion: Renal pathology in microalbuminuric NIDDM patients without retinopathy was heterogeneous. This may explain heterogeneous clinical meaning of microalbuminuria in NIDDM.