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Lee, Kyu-Tae,Yao, Yuan,He, Junwen,Fisher, Brent,Sheng, Xing,Lumb, Matthew,Xu, Lu,Anderson, Mikayla A.,Scheiman, David,Han, Seungyong,Kang, Yongseon,Gumus, Abdurrahman,Bahabry, Rabab R.,Lee, Jung Woo,P National Academy of Sciences 2016 Proceedings of the National Academy of Sciences Vol.113 No.51
<P>Emerging classes of concentrator photovoltaic (CPV) modules reach efficiencies that are far greater than those of even the highest performance flat-plate PV technologies, with architectures that have the potential to provide the lowest cost of energy in locations with high direct normal irradiance (DNI). A disadvantage is their inability to effectively use diffuse sunlight, thereby constraining widespread geographic deployment and limiting performance even under the most favorable DNI conditions. This study introduces a module design that integrates capabilities in flat-plate PV directly with the most sophisticated CPV technologies, for capture of both direct and diffuse sunlight, thereby achieving efficiency in PV conversion of the global solar radiation. Specific examples of this scheme exploit commodity silicon (Si) cells integrated with two different CPV module designs, where they capture light that is not efficiently directed by the concentrator optics onto large-scale arrays of miniature multi-junction (MJ) solar cells that use advanced III-V semiconductor technologies. In this CPV+ scheme ('+' denotes the addition of diffuse collector), the Si and MJ cells operate independently on indirect and direct solar radiation, respectively. On-sun experimental studies of CPV+ modules at latitudes of 35.9886 degrees N (Durham, NC), 40.1125 degrees N (Bondville, IL), and 38.9072 degrees N (Washington, DC) show improvements in absolute module efficiencies of between 1.02% and 8.45% over values obtained using otherwise similar CPV modules, depending on weather conditions. These concepts have the potential to expand the geographic reach and improve the cost-effectiveness of the highest efficiency forms of PV power generation.</P>
Lee, Kanghyeon,Yang, Gene Jaehyoung,Kim, Hackyeon,Kim, Taejoong,Lee, Sun Sook,Choi, Si-Young,Choi, Sungho,Kim, Yongseon Elsevier Sequoia 2017 Journal of Power Sources Vol. No.
<P><B>Abstract</B></P> <P>The coating effects of electronically and ionically conductive materials on the surface of LiNi<SUB>0.5</SUB>Mn<SUB>1.5</SUB>O<SUB>4</SUB> (LNMO) cathodes for Li-ion batteries are examined. In order for the coating layers to promote facile electrochemical reactions, in addition to their protective functions of blocking side reactions between the LNMO surface and the electrolyte, carbon and Li<SUB>2</SUB>O–2B<SUB>2</SUB>O<SUB>3</SUB> (LBO), which conduct electrons and Li ions, respectively, are chosen as coating materials. The properties of the LBO–carbon composite coating are examined in comparison with those of carbon- or LBO-only coatings. Electrochemical metrics, such as discharge capacity, rate performance, and cyclability, are improved with the addition of the thin-film coatings. The LBO–carbon coating shows the best overall properties, particularly greatly improved capacity retention under elevated-temperature (60 °C) cycling. The multi-conductive feature of LBO–carbon for both electrons and Li ions provides stable electrochemical kinetics under conditions of severe side reactions at elevated temperatures. The proposed simple one-step aqueous process for forming and applying the composite electrode coating may be extended to other materials and the mass production thereof.</P> <P><B>Highlights</B></P> <P> <UL> <LI> LiNi<SUB>0.5</SUB>Mn<SUB>1.5</SUB>O<SUB>4</SUB> cathode is coated with a multi-conductive composite film of LBO and C. </LI> <LI> The elevated-temperature cyclability greatly improves with the LBO–C coating. </LI> <LI> The capacity and rate performance are improved by coating the cathode. </LI> <LI> A cheap and easily scalable process for cathode coating is designed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
최용선(Yongseon Choi),이재원(Jaewon Lee),박은옥(Eunoak Park),이기영(Kiyoung Lee) 한국표면공학회 2021 한국표면공학회지 Vol.54 No.6
As the number of cases of performance degradation owing to corrosion of plant during processing in industries increases, the cost of maintaining industrial factory is increasing year by the year. Most of the materials of the facilities are consist of stainless steel (SS) such as austenite SS, ferrite SS, martensite SS, and duplex SS. Among them austenite SS is cheap and has excellent corrosion resistance and heat resistance. Corrosion is the consumption and change of metals by altering chemical and electrical reactions. The types of SS corrosion include pitting corrosion, crevice corrosion, galvanic corrosion, stress corrosion cracking, and thermal corrosion. The corrosion of SS is not only investigated various environmental factors but also the measurement of the corrosion rate. Therefore, it aims to understand comprehensive corrosion rates in various environments using qualitative, quantitative and electrochemical methods.
다양한 벌꿀과 효모를 이용한 벌꿀와인의 제조 및 품질 특성
이대형(Dae Hyoung Lee),강희윤(Heui-Yun Kang),이용선(Yongseon Lee),조창휘(Chang-Hui Cho),박인태(In-Tae Park),김희동(Heui-Dong Kim),임재욱(Jae-Wook Lim) 한국식품과학회 2012 한국식품과학회지 Vol.44 No.6
품질이 우수한 벌꿀 와인을 개발하고자, 아카시아꿀, 밤꿀, 유자꿀, 잡화꿀을 이용하여 시판 효모 종류별로 발효 중 품질 변화를 조사한 결과 에탄올 함량은 잡화꿀 와인과 밤꿀 와인 모두 효모종류와 상관없이 11.3-11.9%를 보였고 아카시아꿀 와인과 유자꿀 와인은 5.0-8.2%의 에탄올을 생성하였다. 관능을 향상시키기 위해 아카시아꿀과 잡화꿀을 혼합하여 발효한 혼합 와인은 10.9%의 에탄올이 생성되었으며 관능특성이 가장 우수하였고 유자꿀과 잡화꿀 혼합 와인은 11.1%의 에탄올을 생성하였으나 관능특성은 낮았다. 아카시아꿀과 잡화꿀을 혼합 발효한 곳에 진피를 첨가하여 발효시켰을 때 에탄올 함량은 첨가량에 따라 차이를 보이지 않았으며 관능결과에서는 진피 0.2% 첨가 시에 기호도가 가장 좋았다. 청징조건을 확인하기위해 발효가 끝난 허니와인에 벤토나이트 0.6% 처리 후 여과하여 저장 기간별로 탁도를 살펴본 결과 10℃ 보관에서 15일 동안 보관 시에 0.24 NTU로 침전에 안전한 결과를 얻었다. In this study, the brewing and quality characteristics of a variety of honey and yeast strains in Korea were investigated. After fermenting acacia honey, chestnut honey, citrus honey, and mixed flower honey using commercial yeast, the quality changes during fermentation were investigated. Chestnut honey wine (mead) and mixed flower mead showed the highest ethanol contents of 11.9 and 11.3%, respectively after fermenting for 8 days at 25℃. Acacia mead and citron (Chinese lemon) mead showed 5.0 and 8.2% ethanol contents, respectively. Mixed mead, which fermented with acacia honey and mixed flower honey, in order to advance sensory properties, showed the best sensory properties, generating 10.9% ethanol, while another product with citron honey and mixed flower honey generated 11.1% of ethanol but with a lower sensory value. When adding corium peels to the mixed mead of acacia honey and mixed flower honey, the ethanol content was not increased by addition of corium peels into mixed mead, but its total acceptability was increased by addition of 2% corium peels. To check the mead clarification, it was treated with 0.6% of bentonite and filtered; then, its turbidity was observed over a storage period. The safe result for precipitation was shown at the condition of storing at 10οC for 15 days with 0.24 NTU (Nepthelometric Turbidity Unit).