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Synthesis of high-performance nickel hydroxide nanosheets/gadolinium doped-α-MnO_(2) composite nanorods as cathode and Fe_(3)O_(4)/GO nanospheres as anode for an all-solid-state asymmetric supercapacitor

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Journal of Energy Chemistry 2022年第1期31卷 475-484,I0013页

作者： Milan Babu Poudel han joo Kim Department of Convergence Engineering Technology Jeonbuk National UniversityJeonju Jeollabuk-do 54896Republic of Korea

The wide use of manganese dioxide(MnO_(2))as an electrode in all-solid-state asymmetric supercapacitors(ASCs)remains challenging because of its low electrical *** complication can be circumvented by introducing trivalent gadolinium(Gd)ions into the MnO_(2).Herein,we describe the successful hydrothermal synthesis of crystalline Gd-doped MnO_(2) nanorods with Ni(OH)_(2) nanosheets as cathode,which we combined with Fe_(3)O_(4)/GO nanospheres as anode for all-solid-state *** tests dem on strate that Gd dopi ng sign ifica ntly affected the electrochemical activities of the MnO_(2),which was further enhanced by introducing Ni(OH)_(2).The GdMnO_(2)/Ni(OH)_(2) electrode offers sufficient surface electrochemical activity and exhibits excellent specific capacity of 121.8 mA h g^(-1),at 1A g^(-1),appealing rate performance,and ultralong lifetime stability(99.3%retention after 10,000 discharge tests).Furthermore,the GdMnO_(2)/Ni(OH)_(2)//PVA/KOH//Fe_(3)O_(4)/GO solid-state ASC device offers an impressive specific energy density(60.25 W h kg^(-1))at a high power density(2332 W kg^(-1)).This investigation thus shows its large potential in developing novel approaches to energy storage devices.

关键词： Solid-state supercapacitor Manganese dioxide Gadolinium doping Nickel hydroxide nanosheets

pH-induced structural changes of surface immobilized poly (L-lysine) by two-dimensional (2D) infrared correlation study

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Chinese Chemical Letters 2015年第2期26卷 173-176页

作者： Eun joo Yoo Boknam chae Young Mee Jung Seung Woo Lee School of Chemical Engineering Yeungnam University Pohang Accelerator Laboratory Department of Chemistry Kangwon National University

This paper reports the pH-induced structural changes in the surface immobilized poly（L-lysine）（PLL）***-dimensional（2D） correlation analysis was applied to the Fourier transform infrared（FTIR）spectra of the surface-immobilized PLL film to examine the spectral changes induced by the alternations of the protonation state of the amino group in the side *** spectral changes in the FTIR spectra of the PLL film were observed between pH 7 and *** decrease in the protonation state of the amino group in the side chain induced spectral changes in the amino group as well as conformational changes in the alky]group in the side *** pH 1-8,the spectral changes in the amino and alkyl groups in the side chain occurred before those of the amide group in the main chain of the surface immobilized PLL film.

关键词： Poly(L-lysine)(PLL) Surface-immobilized polypeptide FT-IR spectroscopy 2D correlation spectroscopy

The Machine Learning Ensemble for Analyzing Internet of Things Networks:Botnet Detection and Device Identification

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Computer Modeling in Engineering & Sciences 2024年第11期141卷 1495-1518页

作者： Seung-Ju han Seong-Su Yoon Ieck-chae Euom System Security Research Center Chonnam National UniversityGwangju61186Republic of Korea

The rapid proliferation of Internet of Things(IoT)technology has facilitated automation across various ***,this advancement has also resulted in a notable surge in cyberattacks,notably *** a result,research on network analysis has become *** learning-based techniques for network analysis provide a more extensive and adaptable approach in comparison to traditional rule-based *** this paper,we propose a framework for analyzing communications between IoT devices using supervised learning and ensemble techniques and present experimental results that validate the efficacy of the proposed *** results indicate that using the proposed ensemble techniques improves accuracy by up to 1.7%compared to single-algorithm *** results also suggest that the proposed framework can flexibly adapt to general IoT network analysis *** existing frameworks,which only exhibit high performance in specific situations,the proposed framework can serve as a fundamental approach for addressing a wide range of issues.

关键词： Internet of Things machine learning traffic analysis botnet detection device identification

Facile synthesis of graphitic carbon-nitride supported antimony-doped tin oxide nanocomposite and its application for the adsorption of volatile organic compounds

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Journal of Environmental Sciences 2019年第5期31卷 35-42页

作者： Devi Prashad Ojha Jun Hee Song han joo Kim Department of Convergence Technology Engineering Chonbuk National University Eco-friendly Machine Parts Design Center Chonbuk National University

Antimony-doped tin oxide(ATO) nanoparticles with an average size of ～ 6 nm were prepared by co-precipitation and subsequent heat treatment. Graphitic carbon nitride(g-CN)/ATO hybrid nanocomposite was designed by the combination of thermally synthesized g-CN and ATO nanoparticles by ultrasonication. The materials were characterized using N2 adsorption/desorption(BET), X-ray diffraction(XRD), scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), transmission electron microscopy(TEM) and Fourier transform infrared spectroscopy(FTIR). A mixture of five volatile organic compounds(VOCs, chloroform, benzene, toluene, xylene and styrene) was used to compare the adsorption capacity of the samples. The adsorption capacity of ATO nanoparticles was improved by the addition of g-CN. Experimental data showed that, among the five VOCs,chloroform was the least adsorbed, regardless of the samples. The g-CN/ATO showed nearly three times greater adsorption capacity for the VOC mixture than pure ATO. The unchanged efficiency of VOC adsorption during cyclic use demonstrated the completely reversible adsorption and desorption behavior of the nanocomposite at room conditions. This economically and environmentally friendly material can be a practical solution for outdoor and indoor VOC removal.

关键词： Antimony-doped tin oxide(ATO) Graphitic carbon nitride(g-CN) Volatile organic compounds(VOC) Adsorption

Selecting suitable sites for mountain ginseng(Panax ginseng)cultivation by using geographically weighted logistic regression

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Journal of Mountain Science 2017年第3期14卷 492-500页

作者： han Hee JANG Kwang-min CHUNG joo-sang Department of Forest Engineering Resources and ManagementCollege of ForestryOregon State UniversityCorvallisOR 97331USA Department of Forest Sciences College of Agriculture and Life SciencesSeoul National UniversitySeoul 08826Republic of Korea Research Institute for Agriculture and Life Sciences Seoul National UniversitySeoul 08826Republic of Korea

With the well-being trends to pursue a healthy life, mountain ginseng(Panax ginseng) is rising as one of the most profitable forest products in South Korea. This study was aimed at evaluating a new methodology for identifying suitable sites for mountain ginseng cultivation in the country. Forest vegetation data were collected from 46 sites and the spatial distribution of all sites was analyzed using GIS data for topographic position, landform, solar radiation, and topographic wetness. The physical and chemical properties of the soil samples, including moisture content, p H, organic matter, total nitrogen, exchangeable cations, available phosphorous, and soil texture, were analyzed. The cultivation suitability at each site was assessed based on the environmental conditions using logistic regression(LR) and geographically weighted logistic regression(GWLR) and the results of both methods were compared. The results show that the areas with northern aspect and higher levels of solar radiation, moisture content, total nitrogen, and sand ratio are more likely to be identified as suitable sites for ginseng cultivation. In contrast to the LR, the spatial modeling with the GWLR results in an increase in the model fitness and indicates that a significant portion of spatialautocorrelation in the data decreases. A higher value of the area under the receiver operating characteristic(ROC) curve presents a better prediction accuracy of site suitability by the GWLR. The geographically weighted coefficient estimates of the model are nonstationary, and reveal that different site suitability is associated with the geographical location of the forest stands. The GWLR increases the accuracy of selecting suitable sites by considering the geographical variations in the characteristics of the cultivation sites.

关键词： Panax ginseng Site suitability Logistic regression Geographically weighted logistic regression Geographic Information System South Korea

Histopathology and TB-PCR kit analysis in differentiating the diagnosis of intestinal tuberculosis and Crohn’s disease

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World Journal of Gastroenterology 2010年第20期16卷 2496-2503页

作者： joon Mee Kim Hyung Kil Kim Lucia Kim Suk Jin Choi In Suh Park Jee Young han Young chae Chu Kye Sook Kwon Eun joo Kim Department of Pathology College of Medicine Inha University7-206 Shin-heung-Dong 3 GaJoong-GuIncheon 400-711South Korea Gastroenterology College of Medicine Inha University7-206 Shinheung-Dong 3 GaJoong-GuIncheon 400-711South Korea Department of Nano and Bio Research Daegu Gyeongbuk Institute of Science and TechnologyDeocksan-dong 110Daegu 700-742South Korea

AIM: To compare the histopathologic features of intestinal tuberculosis (ITB) and Crohn’s disease (CD) and to identify whether polymerase chain reaction for Mycobacterium tuberculosis (TB-PCR) would be helpful for differential diagnosis between ITB and ***: We selected 97 patients with established diagnoses (55 cases of ITB and 42 cases of CD) who underwent colonoscopic *** features of ITB and CD were reviewed,and eight pathologic parameters were *** cases of acid fast bacilli culture-positive specimens and 10 normal colonic tissue specimens were evaluated as the positive and negative control of the TB-PCR test,*** assays were done using two commercial kits: kit detected IS6110 and MPB64,and kit detected IS6110 only;a manual in-house PCR method was also performed on formalin-fi xed,paraffi n-embedded colonoscopic biopsy ***: Statistically significant differences were noted between ITB and CD with regard histopathologic criteria: size of granulomas (P = 0.000),giant cells (P = 0.015),caseation necrosis (P = 0.003),confluent granulomas (P = 0.001),discrete granulomas (P = 0.000),and granulomas with lymphoid cuffs (P = 0.037).However,29 cases (52.7%) of ITB showed less than fi ve kinds of pathologic parameters,resulting in confusion with *** sensitivities and specificities of the TB-PCR test by kit ,kit ,and the in-house PCR method were 88.9% and 100%,88.9% and 100%,and 66.7% and 100% in positive and negative controls,*** PCR test done on endoscopic biopsy specimens of ITB and CD were signifi cantly different with kit (P = 0.000) and kit (P = 0.000).The sensitivities and specifi cities of TB-PCR were 45.5% and 88.1%,36.4% and 100%,and 5.8% and 100%,for kit and kit and inhouse PCR method on endoscopic biopsy *** the 29 cases of histopathologically confusing CD,10 cases assayed using kit and 6 cases assayed using kit were TB-PCR positive.A combi

关键词： Intestine Tuberculosis Crohn’s disease Histopathology Polymerase chain reaction Kit IS6110 MPB64

Enhanced biometric encryption algorithm for private key protection in BioPKI system

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Journal of Central South University 2014年第11期21卷 4286-4290页

作者： Cheol-joo chae Kwang-Nam Choi Kiseok Choi Jae-Soo Kim Yong Ju Shin Korea Institute of Science and Technology Information 245 DaehangnoYuseong-gu Daejeon Korea

Protection of private key is the most critical part in public key infrastructure(PKI) system since it depends on the confidentiality of private key. Thread of password detection has been known as the vulnerability in this PKI system. Recently, studies have been conducted on Bio PKI system that uses the biometric information of users in order to replace the password type of private key protection in PKI system. However, Bio PKI system also has vulnerability in that biometric information used for protection of private key cannot be reused once it is stolen or lost. So, we propose the method to protect the private key using FIDSEQi which binds sequence to biometric information. The proposed method enhances reusability of biometric information and presents higher attack complexity than the method of authentication by cross matching single biometric information.

关键词： BioPKI system fingerprint biometric encryption secret share

Direct dynamic-simulation approach to trajectory optimization

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Chinese Journal of Aeronautics 2021年第10期34卷 6-19页

作者： Sung Wook HUR Seong han LEE Yong Hyeon NAM Chang-joo KIM Department of Aerospace Information Engineering Konkuk UniversitySeoul 05029Republic of Korea

This paper proposes a new direct method for an efficient trajectory optimization using the point that the dynamics of a deterministic system are uniquely determined by initial states and controls imposed over the time horizon of *** effectively implement this concept,the Hermite spline is adopted to interpolate the continuous controls and the system dynamics are integrated with corresponding control parameters in *** a result,the optimal control problem can be transcribed into a nonlinear programming problem which has no dynamic equality constraints and no intermediate states in its design *** addition,the paper proposes an efficient recursive Jacobian estimation technique and introduces a Jacobian transformation matrix to straightforwardly handle the general state *** properties of the present method are thoroughly investigated through its applications to the trajectory optimization for a soft lunar landing from a parking orbit,including the detailed analyses for the de-orbiting *** computed results are compared with those using the pseudo-spectral method to demonstrate an extreme outperformance of the proposed method in the aerospace applications over the traditional direct method.

关键词： Trajectory optimization Direct method Hermite spline interpolation Pseudo-spectral integrator Soft lunar landing

Implementation of tactical maneuvers with maneuver libraries

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Chinese Journal of Aeronautics 2020年第1期33卷 255-270页

作者： Do hyeon LEE Chang-joo KIM Sung wook HUR Seong han LEE School of Aerospace Information Engineering Konkuk UniversitySeoul 05029Republic of Korea

This study creates and combines the general maneuver libraries for fixed-wing aircraft to implement tactical ***,the generalized maneuver libraries are established by analyzing the characteristics of tactical maneuvers required in *** 7th order polynomial is applied to both the creation of the maneuver libraries and the generation of the trajectories or flight paths for modal *** track the desired trajectory,we design the Attitude Command Attitude Hold(ACAH)system and the Rate Command Rate Hold(RCRH)system using Model Following Controller(MFC).Moreover,the Line-of-Sight(LOS)guidance law is *** particular,the CONDUIT~?is employed to optimize the gains so that the control systems meet the aircraft handling Qualities(HQ)***,flight simulations are performed for the longitudinal loop,immelmann-turn,and climb-slalom-descent maneuvers to verify that tactical aggressive maneuvers are realizable via the combination of maneuver *** study can contribute to the development of flight techniques for aircraft tactical maneuvers and to the revision of air force operational manuals.

关键词： 7th order polynomial Attitude command attitude hold system handling qualities Maneuver libraries Rate command rate hold system Tactical maneuvers