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Fujisawa, Naoaki,Oya, Soichi,Mori, Harushi,Matsui, Toru The Korean Neurosurgical Society 2015 Journal of Korean neurosurgical society Vol.58 No.5
Chronic lymphocytic inflammation with pontine perivascular enhancement responsive to steroids (CLIPPERS) is a relapsing-remitting disorder for which steroid administration is a key to control the progression. CLIPPERS can exhibit radiological features similar to malignant lymphoma, whose diagnosis is confounded by prior steroid administration. We report a case of CLIPPERS accompanied by abnormal elevation of ${\beta}-2$ microglobulin in the cerebrospinal fluid (CSF). A 62-year-old man started to experience numbness in all fingers of his left hand one year ago, which gradually extended to his body trunk and legs on both sides. Magnetic resonance imaging demonstrated numerous small enhancing spots scattered in his brain and spinal cord. CSF levels of ${\beta}-2$ microglobulin were elevated; although this often indicates central nervous system involvement in leukemia and lymphoma, the lesions were diagnosed as CLIPPERS based on the pathological findings from a biopsy specimen. We emphasize the importance of biopsy to differentiate between CLIPPERS and malignant lymphoma because the temporary radiological response to steroid might be the same in both diseases but the treatment strategies regarding the use of steroid are quite different.
Fujisawa, K.,Ka, I.,Le Borgne, V.,Kang, C.S.,Kobayashi, K.,Muramatsu, H.,Hayashi, T.,Kim, Y.A.,Endo, M.,Terrones, M.,El Khakani, M.A. Pergamon Press ; Elsevier Science Ltd 2016 Carbon Vol.96 No.-
<P>Carbon nanotubes (CNTs)/lead sulfide (PbS) quantum dots (QDs) nanohybrids have been synthesized through the controlled decoration of CNTs by PbS-QDs by means of the pulsed laser deposition technique. The size of the PbS-QDs and their surface coverage of the CNTs' surface are monitored through the number of laser ablation pulses. Here, while comparing both single-walled (SW) and double-walled (DW) CNTs based nanohybrids, focus is put on the investigation of their interfacial structure and the effect of inner tube. Anchoring PbS through direct sulfur-carbon chemical bonding between CNTs' outer wall and PbS-QDs, which are thought to be profitable for efficient charge transfer but not for charge transport along CNT's tube axis, are confirmed by Raman spectroscopy and X-ray photoelectron spectroscopy. In the case of double-walled CNTs (DWCNTs), inner tube remains unaffected by ablated PbS species, then it serves efficient conduction way for transferred photo-generated charges. This unique feature of the DWCNTs based nanohybrid, where the photocharges are generated by the chemically bonded PbS-QDs to the outer tube and then efficiently conveyed by the inner tube of the nanotubes, is highly likely at the origin of their significantly higher photo-activity (several hundred times than in SWCNTs-based nanohybrids). (C) 2015 Elsevier Ltd. All rights reserved.</P>
Fujisawa, Naoki,Zhang, Teng Fei,Lee, Byoung Hun,Kim, Kwang Ho Published for the Materials Research Society by th 2016 Journal of materials research Vol.31 No.23
<▼1><B>Abstract</B><P/></▼1><▼2><P>Surface roughness and finite sample thickness are major sources of error in the nanoindentation measurements of thin films as the former makes it difficult to determine the effective contact point between the indenter and sample while the latter limits the usable depth range to be no more than ∼10% of the film thickness. Combining a closed-form model of a film/substrate system with the ability of nanoindentation to monitor the contact depth, the present method defines the two-dimensional shape profile of the indenter contacting the composite system with one unknown constant associated with the model and another unknown constant associated with the effective contact point. On the basis that the obtained shape profile of the rigid indenter is identical to the pre-determined indenter shape profile function, the method extrapolates the two constants simultaneously so as to determine the effective contact point. The method was demonstrated for amorphous diamond-like carbon (DLC) coatings.</P></▼2>
Fujisawa, Daisuke,Asato, Hirotaka,Tanaka, Katsunori,Itokazu, Tetsuo,Kojya, Shizuo Korean Society of Plastic and Reconstructive Surge 2020 Archives of Plastic Surgery Vol.47 No.2
In this report, we present a case in which good results were achieved by treatment using a free jejunal patch graft with virtual endoscopy (VE) assistance in a patient whose swallowing had failed to improve for 40 years after he mistakenly swallowed sulfuric acid, despite pectoralis major myocutaneous flap grafting and frequent balloon dilatation surgery. During the last 20 years, virtual computed tomography imaging has improved remarkably and continues to be used to address new challenges. For reconstructive surgeons, the greatest advantage of VE is that it is a noninvasive modality capable of visualizing areas inaccessible to a flexible endoscope. Using VE findings, we were able to visualize the 3-dimensional shape beyond the stenosis. VE can also help predict the area of the defect after contracture release.
Fujisawa, Kazunori,Hayashi, Takuya,Endo, Morinobu,Terrones, Mauricio,Kim, Jin Hee,Kim, Yoong Ahm The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.26
<P>We explored the effect of substitutional boron doping on the electrical conductivity of a metallicity-separated single walled carbon nanotube (SWCNT) assembly. Boron atoms were introduced into semiconducting (S)- and metallic (M)-SWCNT assemblies using high temperature thermal diffusion and the concentration of the doped boron atoms was controlled by the thermal treatment temperature. Depending on the conduction mechanism of the SWCNT assembly, both positive and negative effects upon boron incorporation are observed. For the S-SWCNT sheet, the electrical resistivity decreased by about 1 order on introduction of a small amount of boron atoms, due to the localized state for hopping conduction. In contrast, we observed an increase in the electrical resistivity on boron doping for M-SWCNTs. The pristine and boron doped metallic SWCNTs exhibited a tendency of decreasing electrical resistivity in the presence of an external magnetic field perpendicular to the film, which indicated two-dimensional weak localization behavior. A detailed analysis of the resistivity and the magnetoresistance implied that an increase in the inelastic scattering event at the doped boron site reduced the phase coherence length, leading to an increase in the electrical resistivity.</P>
H. Fujisawa,H. Niu,M. Shimizu,M. Sugata 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
We demonstrated deep level transient spectroscopy (DLTS) and isothermal capacitance transient spectroscopy (ICTS) measurements for metal/insulator/semiconductor (MIS) and metal/ferroelectric/insulator/semiconductor (MFIS) structures using insulating TiO2, ZrO2 and ferroelectric Pb(Zr,Ti)O3 (PZT) layers grown by metalorganic chemical vapor deposition (MOCVD). Interface trap densities of MIS diodes with ZrO2 and TiO2 layers measured by the DLTS method were 1:5 3:9 1011 and 5:2 5:5 1011 eV..1cm..2, respectively. By the ICTS method, interface trap densities were successfully measured as 5:4 1011 and 1:5 1012 eV..1cm..2 for Au/PZT/ZrO2/Si diodes with and without plasma nitridation of Si surface.
Two-step Growth of ZnO Nanorods by Using MOCVD and Control of Their Diameters and Surface Densities
Hironori Fujisawa,Chiaki Kobayashi,Seiji Nakashima,Masaru Shimizu 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.8
We investigated the growth of ZnO nanorods on Al2O3(1120) substrates by using metalorganic chemical vapor deposition and demonstrated the ability to control their diameters and surface densities by using a two-step growth method. Following the first step, the ZnO nanorods were found to be densely packed due to random nucleation across the substrate surface, and their diameters and surface densities (numbers per unit area) were interdependent. During the second growth step,because nucleation sites were limited to the tips of existing nanorods, an upper limit was placed on the surface density of the second-layer nanorods. The surface density of the second-layer nanorods was also influenced by the reaction pressure during the second growth step. The diameter of the ZnO nanorods in the second layer was determined by the growth temperature during the second step and could be controlled independently of the surface density. Consequently, ZnO nanorods with small diameters (< 100 nm), low surface densities (< 10 µm−2) and large spacings (> 200 nm), which are difficult grow using a one-step growth method, were successfully produced. The deposition of 180-nm-thick Pb(Zr,Ti)O3 coatings onto sparsely-grown ZnO nanorods was also demonstrated.
Preparation of IrO2 Thin Films by MOCVD Using Ir(EtCp)(CHD)
H. Fujisawa,S. Watari,H. Niu,M. Shimizu,N. Oshima 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
We report on MOCVD of IrO2 thin lms by using liquid Ir precursor, Ir(EtCp)(CHD). IrO2 lms were successfully grown on SiO2/Si, Ti/SiO2/Si and Pb(Zr,Ti)O3/Pt/SiO2/Si at 400C and oxygen concentration of as high as 77 %. IrO2 lms prepared on SiO2/Si with and without surfaceoxidizedIr seeds exhibited an electrical resistivity of 103 cm, and a root-mean-square surface roughness of 5 nm. IrO2 lms showed step coverages of 40-50%on SiO2-stepped substrate with L/S (line and space) of 0.7/3.6 and 1.4/2.9 m.