Kazuhiro Harada

ORCID: 0000-0003-0010-2042
Publications
Citations
Views
---
Saved
---
About
Contact & Profiles
Research Areas
  • Silicon and Solar Cell Technologies
  • Traumatic Ocular and Foreign Body Injuries
  • Advancements in Photolithography Techniques
  • Silicon Nanostructures and Photoluminescence
  • Thin-Film Transistor Technologies
  • Ocular Surface and Contact Lens
  • Advanced Optical Network Technologies
  • Facial Trauma and Fracture Management
  • Semiconductor Lasers and Optical Devices
  • Railway Engineering and Dynamics
  • Copper Interconnects and Reliability
  • Optical Network Technologies
  • Automotive and Human Injury Biomechanics
  • Advanced Surface Polishing Techniques
  • Glioma Diagnosis and Treatment
  • Retinal and Optic Conditions
  • Semiconductor materials and devices
  • Solidification and crystal growth phenomena
  • Ocular Infections and Treatments
  • Nanofabrication and Lithography Techniques
  • Corneal Surgery and Treatments
  • Glaucoma and retinal disorders
  • Semiconductor materials and interfaces
  • Ion-surface interactions and analysis
  • Corneal surgery and disorders

Fukuoka University
2012-2024

Kindai University
2024

Sumco Corporation (Japan)
2016-2023

Railway Technical Research Institute
2009

NTT (Japan)
1983-2008

Kumamoto Orthopedic Surgery Hospital
2005

Yamaguchi University
2004

Mitsubishi Materials (Japan)
1997-2002

NTT Basic Research Laboratories
2002

Osaka University
2000

Background: We studied the kinetic phenomenon of an airbag impact on eyes with different axial lengths using finite element analysis (FEA) to sequentially determine physical and mechanical responses intraocular segments at various deployment velocities. Methods: The human eye model we created was used in simulations FEA program PAM-GENERIS TM . set 21.85 mm (hyperopia), 23.85 (emmetropia) 25.85 (myopia), initial velocities 20, 30, 40, 50 60 m/s. deformation rate calculated as ratio length...

10.2147/opth.s445253 article EN cc-by-nc Clinical ophthalmology 2024-03-01

Of 875 idiopathic carpal tunnel syndrome (CTS) cases, 101 (11.5%) required trigger digit release operations within three years before and/or after (CTR); these cases were investigated, retrospectively. Trigger (TDR) was performed most often the CTR, especially months. Next common at same time as CTR. The TDR performance rate CTR 5.9%. nerve conduction study (NCS) comparison between digits-associated CTS and isolated showed that pre-operative distal motor latency significantly more delayed in...

10.1142/s0218810405002905 article EN Hand Surgery 2005-01-01

We describe a field trial of wavelength routing full-mesh wavelength-division-multiplexing (WDM) (AWG-STAR) network for citywide local administration in Japan. An AWG router and five WDM nodes were connected to the existing fiber downtown area city Chitose, Hokkaido. A 5 /spl times/ was overlaid on Chitose intranet. video-on-demand system based Gigabit Ethernet links, high-definition serial digital interface signals, synchronous hierarchy signals STM-16 links are transmitted routed...

10.1109/jlt.2003.822317 article EN Journal of Lightwave Technology 2004-02-01

Airbags have substantially reduced mortality and morbidity, while ocular injuries caused by airbags been reported. We applied a three-dimensional finite element analysis (FEA) model we established for evaluation of the deformation an intact eyeball various axial lengths induced airbag impact at velocities.A human eye created was used in simulations with FEA program, PAM-GENERIS™ (Nihon ESI, Tokyo, Japan). The set to eyes 21.85 mm (hyperopia), 23.85 (emmetropia) 25.85 (myopia), initial...

10.1007/s10792-022-02609-7 article EN cc-by International Ophthalmology 2022-12-19

Oxygen precipitation properties in the as‐grown defect‐free region of nitrogen‐doped Czochralski silicon (Cz‐Si) single crystals with very low oxygen concentrations ([Oi]) are investigated. At [Oi] values 4.6–5.9 × 10 17 atoms cm −3 , oxide precipitates a high density 9 generated owing to enhancement by nitrogen‐doping. In contrast, at 1.3–2.6 no observed even though nitrogen‐doped. is analyzed based on thermodynamic model, which some embryos assumed exist Cz‐Si temperatures crystal growth,...

10.1002/pssa.201900272 article EN physica status solidi (a) 2019-06-07

The formation of oxidation induced stacking fault (OSF) nuclei during Czochralski silicon crystal growth was investigated using crystals subjected to in situ annealing for either 1 or 4 hours by halt pulling growth. effects at temperatures from about 1160° C 1030° can be summarized as follows. In positions held 1090° and C, the radial distributions OSFs, LSTDs (light scattering tomography defects), OPs (oxygen precipitates after annealing) changed greatly. position large were formed but...

10.1143/jjap.36.3366 article EN Japanese Journal of Applied Physics 1997-06-01

Vernal keratoconjunctivitis (VKC) is a refractory ocular allergic disorder that mainly affects boys. A few studies have attempted to develop classification of subtypes VKC. In this study, we investigated computational approach called cluster analysis separate VKC cases into groups based on clinically relevant characteristics.In total, 41 consecutive patients diagnosed with at the Department Ophthalmology Fukuoka University Hospital were included. Patients treated immunosuppressive eye drops...

10.2147/opth.s431798 article EN cc-by-nc Clinical ophthalmology 2023-10-01

Introduction of a magnetic spectrometer for the analysis nuclear reaction products can open new dimension in structure studies as well through capability achieving high-resolution and low-background measurements. Ion-optical matching methods to achieve better energy (momentum) resolutions than those inherent incident beam causing are described using beams from an accelerator. They lateral dispersion matching, focus also kinematic correction. In addition angular should be performed if...

10.5702/massspec.48.306 article EN Journal of the Mass Spectrometry Society of Japan 2000-01-01

Abstract A new photoresist composed of cyclized cis‐1, 4‐polybutadiene has been developed. The resist much higher sensitivity on exposure to ultraviolet light than the conventional from polyisoprene. This no resist‐flow even at 250°C, and provides high resolution baking 200°C. Thermogravimetric analysis showed that polybutadiene decomposes temperature

10.1002/pen.760170608 article EN Polymer Engineering and Science 1977-06-01

We have carried out three-dimensional finite element analysis (FEA) to determine the physical and mechanical response in several ocular injuries. applied this FEA model evaluate an airsoft gun impact on eye deformation rate of eyes various axial lengths at velocities.This study was a human using program created by Nihon, ESI Group. The pellet set initial velocities 45, 60 75 m/s with addition variation length 20 mm (hyperopia), 22 (emmetropia), 24 (myopia) 26 (high myopia). Deformation...

10.2147/opth.s249483 article EN cc-by-nc Clinical ophthalmology 2020-05-01

The authors propose a novel optical lithography system that has resolving power more than 1.6 times higher the of conventional projection systems. This offers superior practical advantage using masks without phase shifters. explain principle and present its experimental confirmation. Possible applications to advanced processes are also mentioned. combination with an i-line KrF excimer laser source will most probably be method used for 64 M 245 DRAM (dynamic RAM) processes.< <ETX...

10.1109/iedm.1991.235262 article EN 2002-12-09

We have examined the defects in oxidation-induced stacking fault (OSF) ring region as-grown Czochralski silicon crystals subjected to situ annealing by halt of pulling during crystal growth using secondary ion mass spectrometry (SIMS) and transmission electron microscopy (TEM) order investigate nature OSF nuclei. Oxygen aggregates were observed held for 4 h 16 SIMS. The aggregate density corresponded grown-in without a flow pattern revealed non-agitated Secco etching. TEM observation...

10.1143/jjap.37.3194 article EN Japanese Journal of Applied Physics 1998-06-01

We studied the kinetic phenomenon of an airbag impact on eyes after trabeculectomy using finite element analysis (FEA), a computerized method for predicting how object reacts to real-world physical effects and showing whether will break, sequentially determine responses at various deployment velocities.

10.2147/opth.s459925 article EN cc-by-nc Clinical ophthalmology 2024-05-01

Vernal keratoconjunctivitis (VKC) is a refractory ocular allergic disorder that mainly affects boys. Long-term follow-up has been rarely reported for VKC. We investigated the long-term clinical outcome of VKC to identify relevant features prognostic value based on median 70 months.

10.2147/opth.s472826 article EN cc-by-nc Clinical ophthalmology 2024-08-01

We have previously studied the physiological and mechanical responses of eye to blunt trauma in various situations using finite element analysis (FEA). In this study, we evaluated volume kinetics an airbag impact on FEA sequentially determine change rates intraocular segments at deployment velocities.

10.2147/opth.s479607 article EN cc-by-nc Clinical ophthalmology 2024-09-01

Circularly polarized luminescence (CPL) activity was induced in a racemic Tb(tacn) complex by the coordination of chiral 1-phenylethylamine ligand to Tb centre.

10.1039/d4cc05191b article EN Chemical Communications 2024-01-01

Abstract Thermally activated defect behaviors in nitrogen (N)-doped Czochralski silicon (Cz-Si) single crystals were investigated using deep level transient spectroscopy and quasi-steady-state photoconductance to confirm the crystals’ applicability insulated gate bipolar transistors (IGBTs). The thermally defects, which probably N-vacancy complexes degraded minority carrier lifetime, detected with extremely low densities N-doped Cz-Si compared N-rich floating zone Si after heat treatments at...

10.35848/1347-4065/ace011 article EN cc-by Japanese Journal of Applied Physics 2023-06-20

We appreciate Asmaria et al for their interest in our study "Finite element analysis of changes deformation intraocular segment by airbag impact eyes various axial length". 1 Our development the human eyeball model 1999 allowed us to conduct finite (FEA) foreign body injury simulation using time rental supercomputer. 2 This facilitated subsequent studies on likely effects traumatic impacts that have undergone ocular surgical procedures workstation due improvement machine performance...

10.2147/opth.s472368 article EN cc-by-nc Clinical ophthalmology 2024-04-01

This paper describes the performances of 1.3-μm-band single-mode optical cables, a fiber splicing apparatus, and cable installation machine. It also discusses loss characteristics in 20-km long repeater section 400-Mbit/sec transmission system. An average 0.48 dB/km an splice 0.11 dB were achieved at 1.3 μm field. Optical distribution was investigated experimentally. losses between 10.2 13.9 attained for μm.

10.1364/ao.22.003079 article EN Applied Optics 1983-10-01

Each block of continuous railway RC (reinforced concrete) rigid frame viaducts vibrates at a different natural frequency when an earthquake occurs; therefore, it is not only vibration displacement each but also angular rotation occurring the boundaries structures, which causes decrease in train-running quality. In this study, relationship between and quality during formulated based on numerical analysis.

10.1299/jsmestech.2009._360713-1_ article EN The Proceedings of International Symposium on Seed-up and Service Technology for Railway and Maglev Systems STECH 2009-01-01
Coming Soon ...