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Flower-like NiCo2O4 prepared by gelatin template as an anode material for lithium ion batteries
신하은,이완진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The flower-like NiCo2O4 particles are synthesized with gelatin via a hydrothermal method for Lithium ion batteries (LIBs). Gelatin as biotemplate makes metal precursors possible to be assembled around its hydrophilic group which creates flower-like morphology. This structure benefits electrochemical properties, offering i) its small crystal size which increases possibility of contact between charges, and ii) large surface area assisted by gelatin template which provides easy diffusion of electrolytes. Spinel lithium cobalt oxide renowned for its good electronic conductivity gives the advantage in migration of lithium ions. As a result, the flower-like NiCo2O4 particles show noticeable capacitance on the anode of LIBs.
신하은,오승욱,박우람 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-
Effective cancer therapeutics based on extracellular vesicles (EVs) require high-efficiency cancertargetingand drug-encapsulation technology. Here, we demonstrate hybrid nanovesicles by fusinganti-epidermal growth factor receptor-chimeric antigen receptor-expressing cell-derived vesicles (anti-EGFR-CAR-CDVs) with drug-encapsulated liposomes for effective cancer treatment. HEK293 cells weregenetically engineered with the anti-EGFR-CAR plasmid, and CAR-CDVs were produced by serial extrusionof the engineered cells. CAR-CDVs and drug-encapsulated liposomes were then efficiently fused togenerate hybrid nanovesicles in 30% EtOH. This study employed a photosensitizer as a model drug forphotodynamic therapy (PDT). The hybrid nanovesicles retained the CAR-CDV membrane proteins witha size of 170 nm. Indeed, photosensitizer-encapsulated hybrid nanovesicles could effectively targettumor cells and inhibit tumor growth upon laser irradiation. We believe that the proposed technologyfor the successful fusion of CDVs and liposomes can be used as a drug delivery platform with high tumortargeting and encapsulation efficiency.
신하은,김채빈,안석훈,김두헌,임종국,고문주 한국복합재료학회 2019 Composites research Vol.32 No.6
To address tremendous needs for developing efficiently heat dissipating material with lightweights, a new class of polymer possessing recyclable and malleable characteristics was synthesized for incorporating model functional hexagonal boron nitride (h-BN) filler. A good interfacial affinity between the polymer matrix and the filler along with shear force generated upon manufacturing the composite yielded the final product bearing highly aligned filler via simple hot pressing method. For this reason, the composite exhibited a high thermal conductivity of 13.8 W/mK. Moreover, it was possible to recover the h-BN from the composite without physical/chemical denaturation of the filler by chemically depolymerizing the matrix, thus the recovered filler can be re-used in the future. We believe this polymer could be beneficial as matrix for incorporating many other functional fillers, thus they may find applications in various polymeric composite related fields. 본 연구에서는 재활용이 가능하며 열가소성 특성을 지닌 신규 고분자 수지를 개발하고 합성하였다. 이렇게 개발된 수지와 판상형 질화붕소(h-BN) 사이의 계면 친화성이 좋음을 계산과학을 통하여 확인하고 열압기(hot press)를 이용하여 복합소재를 제조하였다. 고분자 수지와 필러 사이의 계면 친화성과 함께 복합소재 제조시 발생되는 전단력(shear force) 만으로도 매우 높은 필러 정렬도를 지닌 복합소재를 제조할 수 있었고, 이러한 이유로 복합소재는 최대 13.8 W/mK의 높은 열전도도를 갖는 것을 확인하였다. 또한, 개발된 수지가 화학적으로 분해 가능한 장점을 이용하여 제조된 복합소재로부터 물리/화학적 변성 없이 필러를 회수할 수 있었고 이렇게 회수된 필러는 향후 다양한 신규 복합소재 제조에 재활용이 가능하다.
Electrochemical properties of NiCo2O4 spherical clusters for lithium ion batteries
신하은,이완진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The NiCo2O4 spherical cluster are prepared by hydrothermally treating microspheres comprised of metal precursors (nickel nitrate and cobalt nitrate) encapsulated on the surfaces of glucose-based carbon spheres as the template, followed by the calcination at 600°C. The nanostructured NiCo2O4 spherical cluster with spinel structure show high capacitance. Because of its spinel structure, nickel cobaltite has high electronic conductivity which allows easy electron flow. Each of spherical metal oxide grains offer increased electrochemical reaction sites compared with its raw crystal form. Additionally, the abundant voids generated by decomposition and removal of the carbon spheres as the template have an effect on the prevention of the volume expansion. These voids play an important role in maintaining the nanostructures during lithiation and delithiation. Therefore, that nano-sized spherical NiCo2O4 electrode demonstrates high electrochemical performance.
초등 인공지능 교육에서 ‘생각에 대한 생각’ 교육방법의 적용 연구
신하은,김현철 한국컴퓨터교육학회 2023 컴퓨터교육학회 논문지 Vol.26 No.2
Recently, various discussions have been conducted on teaching and learning methods considering the stage of cognitive development of elementary school students. Currently, most curriculums consist of conveying the concept of AI and experiencing interesting services, but discussions on essential educational goals are ambiguous. From this point of view, Minsky and Peppert, who initially discussed computing thinking and AI education for children, emphasize thinking about thinking as an educational goal and argue that programming, algorithms, and computers are efficient tools for expanding such cognitive capabilities. In this study, the perspective of “thinking about thinking” is designed and applied to elementary AI education, and whether it has a positive effect on children's ability to observe, express, and improve intelligent thinking. Among the ‘classification·group’ models of AI, unplugged activities for ‘thinking about thinking’ were designed and class experiments were conducted under the theme of image and sound recognition. As a result of analyzing the activity sheets and individual interview contents, the learner analyzed his or her intelligent behavior and judgment to solve the problem n-dimensionally and discovered various features for accurate algorithms. In addition, he recognized that ‘AI is an imitation of complex human intelligence'. In this study, a new perspective on educational goals and teaching and learning methods in elementary AI education and their effects were presented using the ‘thinking about thinking’ approach. 최근 초등학생의 인지발달 단계와 교육목표를 고려한 교수학습 방법에 대해 다양한 논의가 진행되고 있다. 현재 대부분 교육과정은 인공지능의 개념을 취사 전달하고 흥미로운 서비스를 체험하는 것으로 이루어져 있으나, 본질적인 교육목표에 대한 논의는 다소 모호하다. 이러한 관점에서 초기에 어린이를 위한 컴퓨팅 사고력과 인공지능 교육에 대해 논의한 민스키와 페퍼트는 ‘생각에 대한 생각(thinking about thinking)’을 교육목표로 강조하며 프로그래밍, 알고리즘, 컴퓨터 등이 그러한 인지적 역량 확장을 위한 효율적인 도구라고 주장한다. 본 연구에서는 ‘생각에 대한 생각’ 관점을 초등 인공지능 교육에 설계·적용하고, 이것이 아이들의 지능적 사고에 대한 관찰, 표현, 그리고 개선 역량에 긍정적인 효과가 있는지를 확인하고자 한다. 이를 위해 인공지능의 ‘분류·군집' 모델 중 학습자의 실생활과 밀접한 이미지·소리 인식을 주제로 하여 ‘생각에 대한 생각’을 위한 언플러그드 활동을 설계 및 수업 실험을 진행하였다. 주제별 활동지와 개별 인터뷰 내용의 분석 결과, 주제가 진행될수록 학습자는 문제 해결을 위한 자신의 지능적 행위·판단을 n차원적으로 분석하였으며 정확도 높은 알고리즘을 위해 다양한 특징(feature)을 발견하였다. 또한, ‘인공지능이란 복잡한 인간의 지능을 모방한 존재’임을 인지하고 지능적 사고 행위의 절차를 명시적으로 표현하였다. 본 연구에서는 ‘생각에 대한 생각’ 접근 방법을 사용하여 초등 인공지능 교육에서의 교육목표와 교수학습 방법에 대한 새로운 관점과 그 효과를 제시하였다.