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Asymmetric Ground Rotman Lens for Multilayer Packages
Jaeheung Kim,Woosung Lee,Young Joong Yoon THE INSTITUTE OF ELECTRICAL ENGINEERS 2014 IEEE Microwave and Wireless Components Letters Vol. No.
<P>An asymmetric ground Rotman lens is presented in this letter. A new design of a Rotman lens is proposed to accommodate a whole beamforming system by providing separate ground layers for antennas and circuits. The lens has three dielectric layers and four metallic layers. The prototype of the lens consists of seven array ports, five beam ports, and six dummy ports. The measured return losses show that all the beam ports are matched to better than 12 dB in the band of interest from 23 to 25 GHz. The radiation patterns were measured in a near field measurement system. It shows that the beam directions are -25<SUP>°</SUP>, -13.6<SUP>°</SUP>, 0.2 <SUP>°</SUP>, 12.4 <SUP>°</SUP>, and 24.5 <SUP>°</SUP>, respectively and the beam widths are 14 <SUP>°</SUP>, 13.8 <SUP>°</SUP>, 13 <SUP>°</SUP>, 13.4 <SUP>°</SUP>, and 14.1 <SUP>°</SUP>, respectively. These results are in good agreement with the simulation. Thus, it is verified that the asymmetric ground lens is one of the best solutions for a compact beamforming system.</P>
Excited-state energy relaxation dynamics of triply linked Zn(<small>II</small>) porphyrin arrays
Kim, Pyosang,Ikeda, Toshiaki,Lim, Jong Min,Park, Jaeheung,Lim, Manho,Aratani, Naoki,Osuka, Atsuhiro,Kim, Dongho Royal Society of Chemistry 2011 Chemical communications Vol.47 No.15
<P>In this study, we have investigated the excited-state energy deactivation dynamics of extended π-conjugated molecular systems that consist of competitive electronic and vibrational relaxation processes.</P> <P>Graphic Abstract</P><P>We have investigated the excited-state energy deactivation dynamics of extended π-conjugated molecular systems that consist of competitive electronic and vibrational relaxation dynamics. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc10521c'> </P>
Steric Effect on the Nucleophilic Reactivity of Nickel(III) Peroxo Complexes
Kim, Jalee,Shin, Bongki,Kim, Hyunjeong,Lee, Junhyung,Kang, Joongoo,Yanagisawa, Sachiko,Ogura, Takashi,Masuda, Hideki,Ozawa, Tomohiro,Cho, Jaeheung American Chemical Society 2015 Inorganic Chemistry Vol.54 No.13
<P>A set of nickel(III) peroxo complexes bearing tetraazamacrocyclic ligands, [Ni<SUP>III</SUP>(TBDAP)(O<SUB>2</SUB>)]<SUP>+</SUP> (TBDAP = <I>N</I>,<I>N</I>′-di-<I>tert</I>-butyl-2,11-diaza[3.3](2,6)pyridinophane) and [Ni<SUP>III</SUP>(CHDAP)(O<SUB>2</SUB>)]<SUP>+</SUP> (CHDAP = <I>N</I>,<I>N</I>′-dicyclohexyl-2,11-diaza[3.3](2,6)pyridinophane), were prepared by reacting [Ni<SUP>II</SUP>(TBDAP)(NO<SUB>3</SUB>)(H<SUB>2</SUB>O)]<SUP>+</SUP> and [Ni<SUP>II</SUP>(CHDAP)(NO<SUB>3</SUB>)]<SUP>+</SUP>, respectively, with H<SUB>2</SUB>O<SUB>2</SUB> in the presence of triethylamine. The mononuclear nickel(III) peroxo complexes were fully characterized by various physicochemical methods, such as UV–vis, electrospray ionization mass spectrometry, resonance Raman, electron paramagnetic resonance, and X-ray analysis. The spectroscopic and structural characterization clearly shows that the NiO<SUB>2</SUB> cores are almost identical where the peroxo ligand is bound in a side-on fashion. However, the different steric properties of the supporting ligands were confirmed by X-ray crystallography, where the CHDAP ligand gives enough space around the Ni core compared to the TBDAP ligand. The nickel(III) peroxo complexes showed reactivity in the oxidation of aldehydes. In the aldehyde deformylation reaction, the nucleophilic reactivity of the nickel(III) peroxo complexes was highly dependent on the steric properties of the macrocyclic ligands, with a reactivity order of [Ni<SUP>III</SUP>(TBDAP)(O<SUB>2</SUB>)]<SUP>+</SUP> < [Ni<SUP>III</SUP>(CHDAP)(O<SUB>2</SUB>)]<SUP>+</SUP>. This result provides fundamental insight into the mechanism of the structure (steric)–reactivity relationship of metal peroxo intermediates.</P><P>A set of nickel(III) peroxo complexes, [Ni<SUP>III</SUP>(TBDAP)(O<SUB>2</SUB>)]<SUP>+</SUP> and [Ni<SUP>III</SUP>(CHDAP)(O<SUB>2</SUB>)]<SUP>+</SUP>, were prepared. The spectroscopic characterization clearly shows that the NiO<SUB>2</SUB> cores are almost identical. However, the different steric properties of the supporting ligands were confirmed by structural characterization. The nucleophilic reactivity of the nickel(III) peroxo complexes was highly dependent on the steric properties of the macrocyclic ligands, with a reactivity order of [Ni<SUP>III</SUP>(TBDAP)(O<SUB>2</SUB>)]<SUP>+</SUP> < [Ni<SUP>III</SUP>(CHDAP)(O<SUB>2</SUB>)]<SUP>+</SUP>.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2015/inocaj.2015.54.issue-13/acs.inorgchem.5b00294/production/images/medium/ic-2015-002943_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic5b00294'>ACS Electronic Supporting Info</A></P>
Jaeheung Kim,Moon Sung Kang,Seung Won Jun,조효정,한동욱,Chang‑Seok Kim 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00
Background Regeneration of defective neurons in central nervous system is a highlighted issue for neurodegenerative disease treatment. Various tissue engineering approaches have focused on neuritogenesis to achieve the regeneration of damaged neuronal cells because damaged neurons often fail to achieve spontaneous restoration of neonatal neurites. Meanwhile, owing to the demand for a better diagnosis, studies of super-resolution imaging techniques in fluorescence microscopy have triggered the technological development to surpass the classical resolution dictated by the optical diffraction limit for precise observations of neuronal behaviors. Herein, the multifunctional nanodiamonds (NDs) as neuritogenesis promoters and super-resolution imaging probes were studied. Methods To investigate the neuritogenesis-inducing capability of NDs, ND-containing growing medium and differentiation medium were added to the HT-22 hippocampal neuronal cells and incubated for 10 d. In vitro and ex vivo images were visualized through custom-built two-photon microscopy using NDs as imaging probes and the direct stochastic optical reconstruction microscopy (dSTORM) process was performed for the super-resolution reconstruction owing to the photoblinking properties of NDs. Moreover, ex vivo imaging of the mouse brain was performed 24 h after the intravenous injection of NDs. Results NDs were endocytosed by the cells and promoted spontaneous neuritogenesis without any differentiation factors, where NDs exhibited no significant toxicity with their outstanding biocompatibility. The images of ND-endocytosed cells were reconstructed into super-resolution images through dSTORM, thereby addressing the problem of image distortion due to nano-sized particles, including size expansion and the challenge in distinguishing the nearby located particles. Furthermore, the ex vivo images of NDs in mouse brain confirmed that NDs could penetrate the blood–brain barrier (BBB) and retain their photoblinking property for dSTORM application. Conclusions It was demonstrated that the NDs are capable of dSTORM super-resolution imaging, neuritogenic facilitation, and BBB penetration, suggesting their remarkable potential in biological applications.
Feasibility Study of Gait Recognition Using Points in Three-Dimensional Space
Kim, Minsung,Kim, Mingon,Park, Sumin,Kwon, Junghoon,Park, Jaeheung Korean Institute of Intelligent Systems 2013 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.13 No.2
This study investigated the feasibility of gait recognition using points on the body in three-dimensional (3D) space based on comparisons of four different feature vectors. To obtain the point trajectories on the body in 3D, gait motion data were captured from 10 participants using a 3D motion capture system, and four shoes with different heel heights were used to study the effects of heel height on gait recognition. Finally, the recognition rates were compared using four methods and different heel heights.
Feasibility Study of Gait Recognition Using Points in Three-Dimensional Space
Minsung Kim,Mingon Kim,Sumin Park,Junghoon Kwon,Jaeheung Park 한국지능시스템학회 2013 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.13 No.2
This study investigated the feasibility of gait recognition using points on the body in threedimensional (3D) space based on comparisons of four different feature vectors. To obtain the point trajectories on the body in 3D, gait motion data were captured from 10 participants using a 3D motion capture system, and four shoes with different heel heights were used to study the effects of heel height on gait recognition. Finally, the recognition rates were compared using four methods and different heel heights.
후보 궤적을 이용한 비구조화된 환경에서의 교차로 인식 및 주행
김민수(Minsoo Kim),안준우(Joonwoo Ahn),김민성(Minsung Kim),박재흥(Jaeheung Park) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
In this paper, we present intersection detection and navigation method in the unstructured environment. The presented method uses only a camera image. It generates candidate trajectories in the segmented camera image and decides whether the vehicle enters an intersection using a histogram of the candidate trajectories. In addition, the vehicle selects the target trajectory and tracks it with considering the vehicle velocity, static obstacles, and navigation information. The proposed method was tested and evaluated in a simulation.
자동 전진 후진 전환 지점 선택 알고리즘을 이용한 모델 예측 제어 기반 자율 주차 알고리즘
김민성(Minsung Kim),임규범(GyuBeom Im),안준우(Joonwoo Ahn),김민수(Minsoo Kim),박재흥(Jaeheung Park) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
In this paper, we propose a method for autonomous parking algorithm using automatic selection of forward and backward switching points via model predictive control. An optimized switching point can be calculated by the comparison between forward and backward driving costs. The proposed method was validated by V-rep based simulation environment.