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Kim, Si-Jin,Kim, Min-Cheol,Han, Sang-Beom,Lee, Gyu-Ho,Choe, Hui-Seon,Kwak, Da-Hee,Choi, Sun-Yong,Son, Byung-Goo,Shin, Myoung-Sun,Park, Kyung-Won Elsevier 2016 Nano energy Vol.27 No.-
<P><B>Abstract</B></P> <P>Despite extremely high capacity of Si-based anodes in lithium-ion batteries (LIB), Si-based materials have shown a structural collapse caused by a volumetric expansion/contraction during the cycling process. The conventional electrode structure, which consists of active materials, a current collector, a conducting agent, and a binder, actually showed a low loading of active material due to the other heavy components. In this study, we prepared a 3D flexible Si-composite electrode consisting of core (Si)-shell (Si<SUB>3</SUB>N<SUB>4</SUB>) NPs (Si@Si<SUB>3</SUB>N<SUB>4</SUB>) and carbon nanofibers (denoted as Si-composite/CNF). The Si-composite/CNF was directly utilized as an anode in the absence of the other components was electrochemically evaluated using a coin-type cell. The Si-composite/CNF showed a high capacity of 665mAhg<SUP>−1</SUP> at a fairly high current density of 10Ag<SUP>−1</SUP> and an extremely low capacity loss for 2000 cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We prepared Si-composite/CNF exhibits a 3D flexible Si-composite electrode. </LI> <LI> The electrode consists of core (Si)-shell (Si<SUB>3</SUB>N<SUB>4</SUB>) NPs (Si@Si<SUB>3</SUB>N<SUB>4</SUB>) and carbon nanofibers. </LI> <LI> The Si-composite/CNF was directly utilized as an anode. </LI> <LI> Si-composite /CNF exhibited high specific capacity and improved high rate cycling performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Functional assessment of respiratory muscles and lung capacity of CrossFit athletes
Saulo Cesar Vallin Fabrin,Marcelo Palinkas,Evandro Marianetti Fioco,Guilherme Gallo Costa Gomes,Eloisa Maria Gatti Regueiro,Gabriel Pádua da Silva,Selma Siéssere,Edson Donizetti Verri,Simone Cecilio H 한국운동재활학회 2023 JER Vol.19 No.1
CrossFit is a high-intensity training related to physical fitness and respiratory capacity that can promote changes in lung function. This crosssectional study was aimed at evaluating respiratory muscle strength, electromyographic (EMG) activity, and lung capacity in CrossFit athletes. Thirty subjects aged between 25 and 35 years were divided into groups: CrossFit athletes (n= 15) and sedentary individuals without comorbidities (n= 15). Respiratory muscle strength was evaluated using maximal inspiratory and expiratory pressures, lung capacity, and EMG of the sternocleidomastoid, serratus anterior, external intercostal, and diaphragm muscles at respiratory rest, maximal inspiration and expiration, and respiratory cycle. Data were tabulated and subjected to statistical analyses (t-test and Spearman test, P< 0.05). Respiratory muscle strength on EMG of the sternocleidomastoid, serratus, external intercostal, and diaphragm muscles at the respiratory cycle and maximal forced inspiration and expiration were higher in the CrossFit athletes group than in the sedentary group without comorbidities. CrossFit athlete group showed significantly strong positive correlation between maximal inspiratory and expiratory muscle strengths (Spearman rho= 0.903, P= 0.000), with increasing muscle strength during inspiration favoring an increase in strength during expiration. The forced vital capacity (FVC) and forced expiratory volume in 1 sec (FEV1) also showed a significantly high positive correlation (Spearman rho= 0.912, P= 0.000) in the CrossFit athletes group, showing that higher FVC favors higher FEV1. The results of this study suggest that improved fitness is based on increased respiratory muscle strength on EMG in CrossFit athletes.
Adriana Maria Ragassi Fiorini,Sandra Maria Barbalho,Elen Landgraf Guiguer,Marie Oshiiwa,Claudemir Gregorio Mendes,Rogerio Lopes Vieites,Agnaldo Bruno Chies,Priscilla Bianca de Oliveira,Maricelma da Si 한국식품영양과학회 2017 Journal of medicinal food Vol.20 No.11
Worldwide prevalence of noncommunicable chronic degenerative diseases is among the main causes of death worldwide. The consumption of some foods such as nuts and seeds may be beneficial in preventing these diseases. Dipteryx alata Vogel (DA), known popularly as Baru, belongs to the family Fabaceae and is a native fruit tree from the Brazilian savanna. The purpose of this study was to evaluate the use of seeds of DA on the metabolic and oxidative profile of Wistar rats. Animals were divided randomly into four groups (n = 10): G1 (control group), and G2 (treated with DA 20%), G3 (treated with DA 30%), and G4 (treated with DA 40%). After 40 days, animals were euthanized and metabolic and oxidative profiles were analyzed (glycemia, cholesterol, triglycerides [TGs], high-density lipoprotein-cholesterol [HDL-c], very low-density lipoprotein-cholesterol [VLDL-c], low-density lipoprotein-cholesterol [LDL-c], C reactive protein, aspartate aminotransferase, alanine aminotransferase, Lee index, weight, visceral fat, ferric reducing ability of plasma, and ferric–xylenol orange method. The use of the seeds was effective in reducing TGs, VLDL-c, LDL-c, and increasing HDL-c but did not interfere in the percentage of weight gain, visceral fat, levels of total cholesterol, and oxidative stress. Based on our results, it is possible to say that the use of DA may improve the lipid profile of Wistar rats and we may suggest that the consumption of DA almonds or products prepared with them may be an effective option for the intake of healthy products.
Kim, Da-Mi,Kim, Si-Jin,Lee, Young-Woo,Kwak, Da-Hee,Park, Han-Chul,Kim, Min-Cheol,Hwang, Bo-Mi,Lee, Seul,Choi, Jong-Ho,Hong, Seongho,Park, Kyung-Won Elsevier 2015 ELECTROCHIMICA ACTA Vol.163 No.-
<P><B>Abstract</B></P> <P>Well-defined nanocomposite electrodes based on active materials and graphene have been known to hold improved lithium ion reaction properties such as the lithium ion insertion/desertion reaction, cycle life, and high rate performance. Here, we report two-dimensional nanocomposites consisting of WO<SUB>3</SUB> nanoplates and graphene nanosheets (GNS) using a hydrothermal method and heating process for use in high-performance lithium ion batteries. A compilation of the data from XRD, SEM, and TEM suggests that the nanocomposites consist of high crystalline WO<SUB>3</SUB> nanoplates and GNS. The capacity and high rate cycling performance of the nanocomposites as an anode for lithium ion batteries are evaluated using coin cells. The nanocomposite electrode with an optimized amount of GNS exhibits high reversible capacity, good capacity retention, and excellent high rate cycling performance.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
An Efficient Protocol for ZigBee Security Problems
Jing Si-Da,Mokdong Chung 한국멀티미디어학회 2009 한국멀티미디어학회 학술발표논문집 Vol.2009 No.2
The ZigBee Key management is very important in the network security, which is related to key generation, key exchange, key storage, and key safeguarding. Therefore successful key management is critical to the security of a cryptosystem and x-based authentication. In this paper, we suggest the problems of the ZigBee key management and show a multi-CA center model to overcome these problems.
Kim, Si-Jin,Kim, Min-Cheol,Kwak, Da-Hee,Kim, Da-Mi,Lee, Gyu-Ho,Choe, Hui-Seon,Park, Kyung-Won Elsevier 2016 Journal of Power Sources Vol.304 No.-
<P><B>Abstract</B></P> <P>Many efforts have been made to improve the electrochemical performance of Li-rich cathode materials such as metal ion doping, surface modification, and fabricating nanostructured materials. Here, we demonstrate Li<SUB>2</SUB>MnO<SUB>3</SUB> (denoted as OLO) cathode materials coated with TiO<SUB>2</SUB> (OLO@ TiO<SUB>2</SUB>) for high-performance LIBs. The ratio of layered Li<SUB>2</SUB>MnO<SUB>3</SUB> to anatase TiO<SUB>2</SUB> as well as the shell thickness in the OLO@TiO<SUB>2</SUB> cathodes were controlled by increasing the addition of titanium butoxide. The structure and chemical states for TiO<SUB>2</SUB> coated OLO electrodes were confirmed using field-emission scanning electron microscopy, field-emission transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. To evaluate the performance of the electrodes for LIBs, charge/discharge curves, cycling performance, cyclic voltammograms, and Nyquist plots of the as-prepare cathode materials were obtained using lithium coin cells. In particular, since the TiO<SUB>2</SUB> coating layer in OLO@TiO<SUB>2</SUB> could stabilize the interface between the cathode and electrolyte, OLO@TiO<SUB>2</SUB> exhibited high specific capacity, improved high rate cycling performance, and excellent cycle life due to the low interface resistance and high diffusion coefficient of lithium ion, compared with the uncoated OLO cathode.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We prepared Li<SUB>2</SUB>MnO<SUB>3</SUB> cathode materials coated with TiO<SUB>2</SUB> (OLO@TiO<SUB>2</SUB>). </LI> <LI> The ratio of layered Li<SUB>2</SUB>MnO<SUB>3</SUB> to anatase TiO<SUB>2</SUB> was controlled. </LI> <LI> The shell thickness in OLO@TiO<SUB>2</SUB> was controlled. </LI> <LI> OLO@TiO<SUB>2</SUB> exhibited high specific capacity and improved high rate cycling performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
클라우드 컴퓨팅 환경을 위한 퍼지 논리 기반 상황인식 접근 제어 모델
징스다(Jing Si Da),정목동(Mokdong Chung) 大韓電子工學會 2011 電子工學會論文誌-CI (Computer and Information) Vol.48 No.4
무선 환경에서의 인증 모델은 많은 보안 위험을 내포하고 있다. 그러나 이 분야에 일반적으로 사용되는 표준 기술이 존재하는 것이 아니어서 본 논문에서는 무선 인증 환경에서 보다 강화된 보안을 제시할 수 있는 퍼지 논리 기반의 인증 모델을 제시한다. 제안하는 모델을 위해서 퍼지 논리 기반의 분류 방법을 사용하고 적절한 판단을 위해서 개선된AHP 알고리즘과 사례 기반의 추론 방법을 추가적으로 사용한다. 개선된AHP 알고리즘을 사용해서 다양한 상황정보를 수치화하고, 제안된 인증 모델을 사용해서 입력 데이터에 대한 보안 등급을 계산한 다음, 다양한 환경의 상황정보를 가진 무선환경에 제안된 인증 모델을 안정적으로 사용할 수 있을 것이다. 향후에는 상황인식 연구를 클라우드 컴퓨팅 분야를 포함한 다양한 분야로 제안 모델을 확대하면 더욱 안전한 보안 환경을 기대할 수 있을 것이다. Authentication model in the wireless environment has many security vulnerabilities. However, there is no adapting standard method in this field. Therefore, we propose a fuzzy logic based authentication model to enhance the security level in the authentication environment. We use fuzzy logic based classification to construct our model, and also additionally utilize improved AHP and case-based reasoning for an appropriate decision making. We compute the context information by using the improved AHP method, use the proposed model to compute the security level for the input data, and securely apply the proposed model to the wireless environment which has diverse context information. We look forward to better security model including cloud computing by extending the proposed method in the future.