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Kim, Jihyeon,Lim, Ju Won,Mota, Filipe Marques,Lee, Ji-Eun,Boppella, Ramireddy,Lim, Keun Yong,Kim, Kyungkon,Choi, Won Kook,Kim, Dong Ha The Royal Society of Chemistry 2016 Nanoscale Vol.8 No.45
<P>Transparent conductive electrodes (TCEs) are widely used in a wide range of optical-electronic devices. Recently, metal nanowires (NWs), e.g. Ag and Cu, have drawn attention as promising flexible materials for TCEs. Although the study of core-shell metal NWs, and the encapsulation/overcoating of the surface of single-metal NWs have separately been an object of focus in the literature, herein for the first time we simultaneously applied both strategies in the fabrication of highly stable Ag-Cu NW-based TCEs by the utilization of Ag nanoparticles covered with reduced graphene oxide (rGO). The incorporation of Ag nanoparticles by galvanic displacement reaction was shown to significantly increase the long term stability of the electrode. Upon comparison with a CuNW reference, our novel rGO/Cu-AgNW-based TCEs unveiled remarkable opto-electrical properties, with a 3-fold sheet resistance decrease (from 29.8 Omega sq(-1) to 10.0 Omega sq(-1)) and an impressive FOM value (139.4). No detrimental effect was noticed in the relatively high transmittance value (T = 77.6% at 550 nm) characteristic of CuNWs. In addition, our rGO/Cu-AgNW-based TCEs exhibited outstanding thermal stability up to 20 days at 80 degrees C in air, as well as improved mechanical flexibility. The superior performance herein reported compared with both CuNWs and AgNWs, and with a current conventional ITO reference, is believed to highlight the great potential of these novel materials as promising alternatives in optical-electronic devices.</P>
Jihyeon Kim,Suyeon Kim,Sohee Kim,Sohyun Choi 대한정신약물학회 2010 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.8 No.1
Objective : This study was designed to observe the menstrual patterns of female chronic psychiatric patients treated with antipsychotic drugs and to assess prolactin and estradiol levels to determine the relationship among prolactin, menstrual irregularities and sex hormones. Methods:Sixty female inpatients who had been treated with antipsychotics for more than 5 years participated in this study. The first day of each menstrual cycle during a 6-month period was recorded after menstruation was confirmed by nursing staff. Blood samples were taken at an early follicular phase for menstruating patients and randomly for amenorrheic patients to assess prolactin and estradiol levels. Results:Of the 60 subjects, 12 experienced regular and 23 experienced irregular menstruation. Twenty-five patients were amenorrheic. Hyperprolactinemia was found in 80% of all subjects. The amenorrheic group showed higher prolactin levels, and these levels were correlated with dosage of antipsychotics. Estradiol was lower than 10 pg/ml (undetectable) in 77% of the patients but was exceptionally high in a few participants. Conclusion: About 80% of participants experienced menstrual disturbance, hyperprolactinemia, or hypoestrogenism. These findings suggest that hypothalamic-pituitary-ovarian axis dysfunction was very common in chronic psychiatric patients receiving long-term treatment with antipsychotic medication and should be considered in clinical practice.
수소 캐리어를 위한 CO₂-free 암모니아 합성기술 동향
김지현(Jihyeon Kim),김진호(Jin-Ho Kim),김효식(Hyo Sik Kim),류재홍(Jae-Hong Ryu),강석환(Suk-Hwan Kang),박새미(Sae-Mi Park),정석용(Suk-Yong Jung),이수출(Soo-Chool Lee) 한국에너지기후변화학회 2020 에너지기후변화학회지 Vol.15 No.1
Fossil fuel is a material that is actively used and occupies a significant portion of energy sources. However, environmental pollution occurs due to the use of fossil fuel, research has been actively conducted around the world to develop an alternative energy source. Particularly, as interest in hydrogen energy increases, interest in a medium capable of storing and transporting it also increases. Ammonia, which will be discussed in this paper, not only acts as a storage and transport medium for hydrogen, but is also used as a direct fuel in internal combustion engines or gas turbines due to the combustion characteristics of ammonia. In general, a ton of ammonia requires a significant amount of energy (9 ~ 15 MWh) to be produced and energy loss can occur through the conversion process. Nevertheless, the importance of ammonia as an energy carrier in recent years has been expanding R&D and investment mainly in Australia and Japan. This paper introduces the current state and level of technology developments such as thermal catalyst, electrocatalyst, photocatalyst and chemical roofing for ammonia synthesis.
김지현(Jihyeon Kim),김진호(Jin-Ho Kim),김효식(Hyo Sik Kim),류재홍(Jae-Hong Ryu),강석환(Suk-Hwan Kang),정석용(Suk-Yong Jung),이수출(Soo-Chool Lee) 한국에너지기후변화학회 2021 에너지기후변화학회지 Vol.16 No.1
Environmental problems such as climate change, ecosystem disturbance, and ocean acidification are becoming serious because carbon dioxide(CO₂) emissions continue to increase. For this reason, many technologies for CO₂ recycling and carbon neutrality are being studied to convert CO₂ into usable materials in chemical process, and they correspond CCUS (Carbon dioxide Capture Utilization & Storage) technologies. Among the CCUS researches, RWGS(Reverse Water Gas Shift) reaction, CO₂ + H₂ → CO + H₂O, can utilize more carbon dioxide as reaction material than the other CCU methods and synthesize an intermediate of a chemical process without fossil fuels. Accordingly, the thermodynamic equilibrium, reaction mechanism, and recent catalytic research results(metal, supported metal oxide, perovskite) for the RWGS reaction are summarized in this paper. It also mentions a chemical looping process for more efficient RWGS reaction and compares it with the general RWGS reaction. The solutions necessary for technical stabilization of the chemical looping process were mentioned.
김지현(Jihyeon Kim),김효식(Hyo-Sik Kim),김진호(Jin-Ho Kim),류재홍(Jae-Hong Ryu) 한국에너지기후변화학회 2021 한국에너지기후변화학회 학술대회 Vol.2021 No.11
우리 삶에 있어 생활 편의성이 중요시되면서 포장용기나 일회용품 사용량이 급증함에 따라 폐플라스틱의 발생량이 매년 증가하고 있다. 이에 폐플라스틱을 처리할 수 있는 기술에 대한 관심도가 높아지고 있다. 폐플라스틱 처리 기술 중 하나인 열분해 공정을 통해 연료유로 사용 가능한 열분해유를 생산할 수 있다. 이러한 연료유를 사용할 수 있는 반응 장치 설계나 운전조건 선정을 위해 기초 특성에 대한 자료가 필요한 상황이다. 이에 열분해유를 포함하여 연료유에 속하는 바이오중유, 이온정제유의 연소 특성을 열중량 분석기로 분석하여 비교하였다. 연소 특성 분석은 25 ~ 945 ℃ 온도 범위 내에서 승온 조건 (5 ℃/분, 10 ℃/분, 20 ℃/분)에서 열중량 분석기로 연소 특성을 관찰하였다. 분석 결과는 여러 가지 속도론적 해석(Kissinger, Chatterjee-Conrad, Coats-Redfern, Freeman-Carroll) 방법을 사용하여 비교 해석하였다. 그 결과 연료유 종류에 따라 적합한 해석 방법을 구분 지을 수 있었다.