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전기영동 증착법을 이용한 Black Phosphorus Nano Flake 리튬이온 배터리
김주윤,박병남 한국전기전자재료학회 2019 전기전자재료학회논문지 Vol.32 No.3
Black phosphorus (BP) is a potential candidate for an anode in lithium ion batteries due to its high theoretical capacity and the large interlayer spacing in the monolayered phosphorene form, allowing for lithium intercalation/ deintercalation. In this study, large-scale exfoliation of bulk BP was accomplished using a solution of NaOH and Nmethyl- 2-pyrrolidone (NMP), yielding phosphorene, which can be assembled into nanoflakes using electrophoretic deposition(EPD). Through the systematic addition of NaOH and subsequent sonication, BP nanoflakes were obtained in high yields by EPD, allowing for the integration of these nanoflakes into an anode in the film state. Anodes with a charge/discharge capacity of 172 mAh/g at a rate of 200 mA/g were obtained, which are promising for battery applications through various post-film treatments. 흑린 (Black phosphorus)은 높은 이론 용량과 단층 흑린의 큰 층간 간격으로부터 발생하는 리튬 인터칼레이션/디인터칼레이션에 유리한 구조를 이루고 있어 리튬이온 전지의 음극 전극으로서의 가능성을 가지고 있다. 본 논문에서는 수산화나트륨 (NaOH) N-methyl-2-pyrrolidone (NMP) 용액을 사용하여 대규모 박리를 증명하였으며, 전기영동 증착 (Electrophoretic deposition) 방법을 사용하여 나노 플레이크 흑린 전극을 형성하였다. 수산화나트륨을 첨가하고 초음파 처리하여 흑린 나노 플레이크의 수율을 향상하였다. 전기영동 증착을 사용하여 형성한 흑린 나노 플레이크 전극의 충/방전을 진행하였을 경우 172 mAh/g과 200 mAh/g의 충/방전 용량이 확인되며, 추가적인 다양한 후막처리를 통하여 배터리 음극소재로의 사용이 유망할 것으로 확인된다.
연부조직가동술, 수동신장운동과 근에너지 기법이 넙다리뒤근육의 근두께와 근 긴장도에 미치는 영향
김주윤,심재훈,한현규 한국신경근육물리치료학회(구 한국신경근육재활학회) 2018 한국신경근육재활학회지 Vol.8 No.2
This study aimed to identify alterations in the thickness of the hamstring and the muscle tone in response to soft tissue mobilization (STM), passive stretching (PS), and muscle energy technique (MET). Forty-five male subjects with no orthopedic or neurological diseases volunteered to participate in the study, which were allocated either the SEM, PS, or MET groups, 10 in each. Outcome measure included the thickness and muscle tone of the hamstring. Intervention was an isometric contraction and 10-sec stretching for the STM group, a 10 repetitions of 10-sec stretch for the PS group, and an isometric contraction and relaxation for the MET group. Pre- and post-treatment changes in the thickness and muscle tone of hamstring were significantly different for the three groups (p<.05). However, there were not found statistically significant differences in the thickness and muscle tone of hamstring between the groups (p>.05). This study suggests that all tree methods may be helpful to increase the condition of hamstring. Further studies with robust design will be needed for the generality of our results.
김주윤,이홍규,성연희 한국생약학회 2019 Natural Product Sciences Vol.25 No.1
The present study was conducted to investigate anti-nociceptive and anti-inflammatory effects of the leaves of Ilex latifolia Thunb (I. latifolia) in in vivo and in vitro. Writhing responses induced by acetic acid and formalin- and thermal stimuli (tail flick and hot plate tests)-induced pain responses for nociception were evaluated in mice. I. latifolia (50 - 200 mg/kg, p.o.) and ibuprofen (100 mg/kg, p.o.), a positive non-steroidal anti-inflammatory drug (NSAID), inhibited the acetic acid-induced writhing response and the second phase response (peripheral inflammatory response) in the formalin test, but did not protect against thermal nociception and the first phase response (central response) in the formalin test. These results show that I. latifolia has a significant anti-nociceptive effect that appears to be peripheral, but not central. Additionally, I. latifolia (50 and 100 mg/mL) and 3,5-di-caffeoyl quinic acid methyl ester (5 mM) isolated from I. latifolia as an active compound significantly inhibited LPS-induced NO production and mRNA expression of the pro-inflammatory mediators, iNOS and COX-2, and the pro-inflammatory cytokines, IL-6 and IL-1b, in RAW 264.7 macrophages. These results suggest that I. latifolia can produce antinociceptive effects peripherally, but not centrally, via anti-inflammatory activity and supports a possible use of I. latifolia to treat pain and inflammation.
김주윤,정대균,김한근,정봉준,김나라,박정의 한국분자세포생물학회 2013 Molecules and cells Vol.35 No.2
Chronic inflammation plays an important role in atherogenesis. Experimental studies have demonstrated the accumulation of monocytes/macrophages in athero-sclerotic plaques caused by inflammation. Here, we report the inhibitory effects of lipoteichoic acid (LTA) from Lactobacillus plantarum (pLTA) on atherosclerotic inflammation. pLTA inhibited the production of proinflammatory cytokines and nitric oxide in lipopolysaccharide (LPS)-stimu-lated cells and alleviated THP-1 cell adhesion to HUVEC by down-regulation of adhesion molecules such as intracellular adhesion molecule-1 (ICAM-I), vascular cell adhesion molecule-1 (VCAM-1), and E-selectin. The inhibitory effect of pLTA was mediated by inhibition of NF-B and activation of MAP kinases. Inhibition of monocyte/macrophage infil-tration to the arterial lumen was shown in pLTA-injected ApoE-/- mice, which was concurrent with inhibition of MMP-9 and preservation of CD31 production. The anti-inflammatory effect mediated by pLTA decreased expres-sion of atherosclerotic markers such as COX-2, Bax, and HSP27 and also cell surface receptors such as TLR4 and CCR7. Together, these results underscore the role of pLTA in suppressing atherosclerotic plaque inflammation and will help in identifying targets with therapeutic potential against pathogen-mediated atherogenesis.
첨가제 없이 제작된 나노구조 코발트 산화물 리튬이온 배터리 전극의 전기 화학적 특성
김주윤,박병남,Kim, Juyun,Park, Byoungnam 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.5
Transition metal oxide materials have attracted widespread attention as Li-ion battery electrode materials owing to their high theoretical capacity and good Li storage capability, in addition to various nanostructured materials. Here, we fabricated a CoO Li-ion battery in which Co nanoparticles (NPs) are deposited into a current collector through electrophoretic deposition (EPD) without binding and conductive agents, enabling us to focus on the intrinsic electrochemical properties of CoO during the conversion reaction. Through optimized Co NP synthesis and electrophoretic deposition (EPD), CoO Li-ion battery with 630 mAh/g was fabricated with high cycle stability, which can potentially be used as a test platform for a fundamental understanding of conversion reaction.
김주윤,성기광,김지호,박현철,최고운하늘한아름 적정기술학회 2020 적정기술학회지(Journal of Appropriate Technology) Vol.6 No.2
Assistive technologies for people with disabilities are often marginalized in the Fourth Industrial Revolution. In this paper, we intend to present the possibility of acquiring tactile information through the tactile display adapting an electromagnetic actuator. The multi-layered display designed for tactile communication has innovatively narrowed the size and spacing of cells in order to express pictures, maps, and graphics. This display has enabled the visually impaired to touch two-dimensional information combining with other assistive technologies so that. It would also provide a technical source of access to STEM education (Science, Technology, Engineering, and Mathematics) so that students will perform better and be better prepared for advanced education. Moreover, it can be applied to public infrastructure and transportation in smart-city projects on the globe. Hence, this paper introduces the principle of Electromagnetic-actuator and how it can be utilized in many diverse areas. 4차 산업혁명에 의한 급변하는 기술 발전 과정에서 정보취약계층을 위한 보조공학기술은 종종 간과되고 있다. 본 논문에서는 차세대 보조공학기술로써 전자석 액추에이터를 적용한 촉각 디스플레이를 소개하고자 한다. 다중배열 구조의 촉각 디스플레이는 셀의 크기와 간격을 좁혀 직선과 곡선을 통해 그림, 지도, 그래픽 등을 출력한다. 이는 시각장애인들이 촉각으로 2차원 정보를 확인 할 수 있게 만들고, 기존 정보통신 기술(ICT)와 융합하여 더 많은 정보를 제공한다. STEM교육(과학, 기술, 공학, 수학)에 접근할 수 있는 교육환경을 제공할 뿐만 아니라 대중교통, 공공인프라 등 스마트시티의 다양한 분야에까지도 적용될 수 있다. 본 논문에서는 전자석 액추에이터의 연구 및 제작과정을 설명하고, 그적용 사례를 중심으로 해당 기술이 함의하는 사회, 경제적 가치와 가능성에 대해 살펴보고자 한다.
김주윤,문은채,김주연,김현지,허건,심재정,이정률 한국식품과학회 2023 Food Science and Biotechnology Vol.32 No.4
Bacterial vaginosis (BV) is caused by a microbial imbalance in the vaginal ecosystem, which causes genital discomfort and a variety of potential complications in women. This study validated the potential of Lactobacillus helveticus HY7801 as a probiotic to benefit vaginal health. In vivo, HY7801 reduced the number of Gardnerella vaginalis (GV) and pro-inflammatory cytokines in the vagina of GV-induced BV mice and ameliorated vaginal histological changes. In vitro, HY7801 exhibited positive resistance to simulated gastrointestinal conditions, showed excellent adherence ability to the female genital epithelium, and had high lactic acid and H2O2 production capacity. Furthermore, it was found that HY7801 can alleviate BV because it can suppress the expression of virulence factor genes of GV involved in epithelial cell adhesion and biofilm formation along with antibacterial activity against GV. These results indicate that HY7801 can be used as a promising probiotic strain for the maintenance of a healthy vaginal physiological state.