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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.
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.
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.
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
Poly(ρ-phenylenesulfide)와 Poly(ρ-phenylene)으로부터 제조된 탄소의 리튬 이온 2차전지 anode 재료로서의 전기화학적 특성
유덕영,이주성,박수길,변지형,류신환,정윤이 한양대학교 에너지·환경기술연구소 1998 에너지·環境技術論文集 Vol.4 No.-
Poly(p-phenylenesulfide)와 poly(p-phenylene)으로부터 제조된 탄소를 리튬이온 2차전지용 음극재료로 사용하여 전기화학적특성을 연구하였다. 이들 고분자들을 질소 분위기하에서 승온속도 2℃/min로 1000℃까지 상승시킨 후, 1시간 동안 탄화시켜 탄소를 제조하였다. Poly(p-phenylene)으로부터 제조된 탄소가 보다 더 규칙적인 구조를 가지기 때문에 Poly(p-phenylenesulfide)으로부터 제조된 탄소보다 더 많은 용량과 충방전 효율을 나타내었다. 수산화리튬과 염화주석(Ⅱ)을 첨가하여 용량의 증가와 충방전 효율의 증가를 가져올 수 있었다. 이중에서 poly(p-phenylene)에 염화주석(Ⅱ)을 첨가시켜 제조된 탄소가 가장 큰 충방전 용량과 충방전 효율의 향상을 가져왔다. Carbon inaterials manufactured from poly(p-phenylene sulfide) and poly(p-phenylene), were studied on electrochemical characteristics as anode materials for lithium ion secondary battery. These polymer precursors were heat treated for 1hr at 1000℃ with the rate 2℃/min under nitrogen atmosphere. Carbon manufactured from poly(p-phenylene) showed higher capacity and coulomb efficiency of charge/discharge than carbon from poly(p-phenylene sulfide) because the former has better ordered structure. Carbon manufactured from polymer precursors adding stannous chloride or lithium hydroxide showed higher capacity and better efficiency of charge/discharge. Also, carbon manufactured by adding stannous chloride to poly(p-phenylene) showed the highest capacity and efficiency of charge/discharge.
정윤아(Yunah Jung ) 한국예술종합학교 미술원 조형연구소 2007 Visual Vol.4 No.-
This paper addresses the development process of New York art market in order to investigate the background and primary factors of how capital and market overtook the power of criticism and discourse. The paper begins with World War Ⅱ, a watershed in the development of American culture including art and the market as well. During this decade, critics and museum curators were main forces in the art world, while the number of galleries in the city stagnated at a mere 30. Although the number of galleries drastically increased to over 300 in the next two decades, the art world turned on the same pivot of power dominated by critics. It was the 1980s when the topographical map of the art world dramatically changed and the art dealers’ influence surpassed criticism. The inflow of large-scaled capital and/or speculative capital into the art market due to Reagan’s new economic policy was the direct reason lor this radical change. In the 1990s, Sotheby’s and Christie’s established contemporary art auctions, and accordingly the art market expanded its scale. It continued to expand and art became one of the primary investment porttolios in the 21st Century. The lact that the most frequently quoted buzzwords now are art fund and art index illustrates these social phenomena very well. Under this condition, what would be the role of the discourse and which way should the criticism go? This paper will probe for answers to those questions.