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Park, Hyelee,Kim, Yoonkyung,Kim, Sang-Deuk,Seo, Dongjo,Shim, Sang Eun,Baeck, Sung-Hyeon American Scientific Publishers 2017 Journal of nanoscience and nanotechnology Vol.17 No.11
<P>Due to an increasing demand for portable power sources, lithium air batteries have attracted considerable attention as promising energy storage devices due to their high theoretical specific energy densities. In this study, carbon nanofibers (CNFs) were synthesized via electrospinning with polyacrylonitrile (PAN) and carbonization for use as the cathode in a Li-air battery. The electrospinning time was varied to produce CNFs with different degrees of loading in an attempt to investigate the influence of loading amount on cyclability. The surface morphology was characterized by field emission scanning electron microscopy (FE-SEM). The as-synthesized CNFs consisted of a randomly arranged network of cylindrical nanofibers with high electrical conductivity values and large pore sizes. The CNFs with lowest degree of loading (0.233 mg cm-2), exhibited the highest electrochemical performance up to 130 cycles. This work demonstrated the existence of a linear proportional relationship between the degree of carbon nanofiber loading and the cyclability of a rechargeable lithium-air battery.</P>
군내 주요 사고환자 및 중증질환자 전담지원에 관한 연구 - 발생초기부터 전역 후 관리까지 환자 및 보호자, 부대관리를 중점으로 -
한혜리 ( Hyelee Han ),박순정 ( Soonjeong Park ),김경오 ( Kyeongoh Kim ) 국군의무사령부 2020 대한군진의학학술지 Vol.51 No.1
Objectives; The purposes of this research are to suggest necessary advancements in patients and caregiver management by verifying the difficulties faced by caregiver and the unit through basic patient status analysis conducted by ROK Army's Patient Support Team (PST), and to introduce the roles and responsibilities there of. Methods; Analysis was conducted on PST's 62 cases which were directly visited and counseled in their respective hospitals in 2019. Results; 26 patients (42%) were in severe conditions, the average treatment days were 52.7 days and 39 patients (63%) were hospitalized in ICU. 49 patients (79%) were cared by their families, which increases family's financial and psychological burden. indeed, 51 cases in the meanime, were getting administrative and personnel supports provided by the unit, which increases demands in long and short term patient supports. PST conducted 284 cases of maneuver counseling in 2019. It shows that family's demands included hospital fee, caretaker fee, equipments fee, punishments on the perpetrators, and financial recompense. The unit suffered from financial problems caused by supporting family's accommodation fee along with manpower shortage for on-site officer, administrative, and transportation support. Conclusion; The army must provide dedicated supports to the civilians serving in the military to fulfill their duties to serve the nation and receive adequate care in sufferings for their safe return back to their units and society. PST must take heed to the voices from the ground and establish activity database to contribute to the advancements of military medicine and welfare measures.
Choi, Young Il,Park, Hyelee,Kim, Gil-Pyo,Lim, Dongwook,Jang, Jaeyong,Shim, Sang Eun,Park, Seok Hoon,Baeck, Sung-Hyeon American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.10
<P>Lithium air batteries are considered to be the future of energy storage devices due to their high theoretical energy densities. In this study, RuO2 decorated Mn-based catalysts with various carbon supports, such as ketjen black (KB), Super P (SP), and graphite, were easily synthesized via hydrothermal and precipitation methods, with their physical and chemical properties subsequently investigated. Field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) were used to examine the morphology of the as-synthesized catalysts. The crystalline phase of the RuO2/Mn-based catalyst was characterized via X-ray diffraction (XRD). The crystallinity of the synthesized samples was found to be strongly dependent on the pristine properties of the carbon supports. The prepared catalysts were employed as air-cathode materials for lithium-air batteries. RuO2/Mn-based catalysts prepared with ketjen black not only exhibited high electrocatalytic performance, but also stable cyclability up to 40 cycles, compared to prepared catalysts using SP and graphite as carbon supports.</P>
이기숙,홍용희,박은혜,백혜리 이화여자대학교 사범대학 교육과학연구소 2001 교육과학연구 Vol.32 No.2
유아교육기관의 전반적인 질을 평가하고 관리하는 인정제는 유아와 부모에게 질 높은 교육 경험을 제공하고 유아교육 관계자에게 효율적인 장학을 하기 위한 종합적인 방안이다. 인정제는 질적 수준을 등급 매기려는 것이 목적이 아니라, 질적 수준을 관리하기 위하여 프로그램의 강점과 결함을 세분화시켜 질적 수준의 제고를 기할 수 있게 해준다. 본 연구는 유아교육 프로그램의 평가방법의 하나인 인정제를 개념화하는 것을 목적으로 한다. 이에 우리나라에서 유아교육 기관을 위한 인정제의 목적, 인정제의 방법, 기준과 과정을 시사 받고자 한다. The purpose of this study is to conceptualize accreditation framework for analysing of quality on early childhood programs. Accreditation framework is a strategy to improve the overall quality of early childhood programs. Accreditation serves two essential goals. First, it improves early childhood programs. Especially, self-study gives directors and teachers a framework to make concrete program improvements. Second, it gives parents information to identify high-quality programs. Namely, accreditation provides better quality of child-care programs and education for children, parents and experts. In conclusion, we need to recognize the importance of implementing accreditation. Furthermore we have to develop specific accreditation criteria and systematic procedures to evaluate the components of child-care programs based on our current situation.
Role of Amorphous Si₃N₄ in the Microhardness of Ti-Al-Si-N Nanocomposite Films
In-WookPark,KwangHoKim,JuHyungSuh,Chan-GyungPark,Mi-HyeLee 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.6
Superhard quarternary Ti-Al-Si-N lms were synthesized by using a hybrid coating technique involving arc ion plating and sputtering methods. The relationship between microhardness and microstructural changes due to the percolation phenomenon of amorphous silicon-nitride in Ti-Al- Si-N lms during the deposition process was investigated. The synthesized Ti-Al-Si-N lms were revealed to be composites of (Ti, Al)N crystallites distributed in an amorphous Si3N4 matrix. Due to the percolation of amorphous silicon-nitride, the grain size of (Ti, Al)N crystallites was decreased with increasing Si content. When the Si content was about 9 at.%, the lm was characterized as a nanocomposite, nc-(Ti, Al)N/a-Si3N4, and showed a maximum hardness of about 55 GPa. This hardness value was signicantly larger than that of a pure (Ti, Al)N lm(35 GPa). The increased hardness of the (Ti, Al)N lm with Si addition was probably due to grain boundary hardening through both the Hall-Petch relation derived from grain size renement and the strong cohesive energy of interphase boundaries caused by the percolation of amorphous Si3N4 into the (Ti, Al)N lm.
Park, Inyeong,Kim, Taewoo,Park, Hyelee,Mun, Minho,Shim, Sang Eun,Baeck, Sung-Hyeon American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.10
<P>Pt-based materials are generally recognized as promising electrocatalysts for use in Li-air batteries, but their high cost and scarcity present limiting factors for practical application. Therefore, catalyst costs need to be reduced by either replacing Pt with less expensive materials or by increasing the Pt dispersion. Herein, we report the fabrication of a Pt-Ru/Mn3O4/C composite as a relatively low cost and highly-efficient catalyst for use in Li-air battery cathodes. Mn3O4/C composites were first synthesized via simple precipitation methods. Pt-Ru nanoparticles were subsequently deposited onto the as-synthesized Mn3O4/C materials via impregnation-reduction methods. Results showed that Pt-Ru nanoparticles were uniformly dispersed onto the Mn3O4/C surface as made evident via transmission electron microscopy. The prepared Pt-Ru/Mn3O4/C catalyst was employed as an air-cathode material for Li-Air batteries, exhibiting not only high electrocatalytic performance but also an improved cyclability up to 130 cycles, compared to a physically-mixed catalyst composite.</P>