Effect of Positional Changes on Cerebral Perfusion in Parkinson's Disease Patients With Orthostatic Hypotension.

Objective: Orthostatic hypotension (OH) is one of the most common autonomic dysfunctions in Parkinson's disease (PD) patients. However, many patients with OH are asymptomatic. Conversely, orthostatic dizziness (OD) is not always associated with OH.

Clinical correlates of pareidolias and color discrimination deficits in idiopathic REM sleep behavior disorder and Parkinson's disease.

Visuoperceptual dysfunction is common in Parkinson's disease (PD) and is also reported in its prodromal phase, isolated REM sleep behavior disorder (iRBD). We aimed to investigate color discrimination ability and complex visual illusions known as pareidolias in patients with iRBD and PD compared to healthy controls, and their associating clinical factors. 46 iRBD, 43 PD, and 64 healthy controls performed the Farnsworth-Munsell 100 hue test and noise pareidolia tests.

A Survey of Perspectives on Telemedicine for Patients With Parkinson's Disease.

Objective: Parkinson's disease (PD) patients often find it difficult to visit hospitals because of motor symptoms, distance to the hospital, or the absence of caregivers. Telemedicine is one way to solve this problem.

Methods: We surveyed 554 PD patients from eight university hospitals in Korea.

Feasibility and efficacy of video-call speech therapy in patients with Parkinson's disease: A preliminary study.

Background: Speech therapy is highly effective for patients with Parkinson's disease (PD) who have speech difficulties; however, its accessibility is limited. Online video-call speech therapy has been explored as an alternative option for PD patients.

Objectives: To evaluate the feasibility and efficacy of video-call speech therapy for PD patients.

Measurement Issue in Antecollis.

Background: Antecollis is defined as an involuntary forward flexion of the neck. Previous reports have measured the neck flexion angles based on the line perpendicular to the ground. This led to an inflation of the neck flexion angles in patients who had combined forward truncal flexions, especially upper camptocormia.

Parainfectious Anti-Glial Fibrillary Acidic Protein-Associated Meningoencephalitis.

Movement disorders associated with glial fibrillary acidic protein (GFAP) autoantibodies have rarely been reported as ataxia or tremors. A 32-year-old man with headache and fever, initially diagnosed with viral meningoencephalitis, showed gradual improvement with empirical treatment. Two weeks after the illness, he suddenly developed orofacial, tongue, and neck dyskinesia accompanied by oculomotor abnormalities, which developed into severe generalized choreoballism.

Compact Measurement of the Optical Power in High-Power LED Using a Light-Absorbent Thermal Sensor.

LED (Light-Emitting Diode) presents advantages such as luminescence, reliability, durability compared with conventional lighting. It has been widely applied for life, healthcare, smart farm, industry, and lighting from indoor to the automotive headlamp. However, the LED is vulnerable to thermal damage originated from the high junction temperature, especially in high power applications.

Parosmia in Right-lateralized Semantic Variant Primary Progressive Aphasia: A Case Report.

Parosmia, defined as the distorted perception of an odor stimulus, has been reported to be associated with head trauma, upper respiratory tract infections, sinonasal diseases, and toxin/drug consumption. To date, little is known about parosmia in right-lateralized semantic variant primary progressive aphasia. A 60-year-old right-handed man presented with a 2-year history of parosmia and prosopagnosia.

Modeling of reflection-type laser-driven white lighting considering phosphor particles and surface topography.

This paper presents a model of blue laser diode (LD)-based white lighting coupled with a yellow YAG phosphor, for use in the proper design and fabrication of phosphor in automotive headlamps. First, the sample consisted of an LD, collecting lens, and phosphor was prepared that matches the model. The light distribution of the LD and the phosphor were modeled to investigate an effect of the surface topography and phosphor particle properties on the laser-driven white lighting systems by using the commercially available optical design software.

Phase-locked loop based on machine surface topography measurement using lensed fibers.

We present the phase-locked loop (PLL)-based metrology concept using lensed fibers for on-machine surface topography measurement. The shape of a single-mode fiber at the endface was designed using an ABCD matrix method, and two designed lensed fibers-the ball type and the tapered type-were fabricated, and the performance was evaluated, respectively. As a result, the interferometric fringe was not found in the case of the ball lensed fiber, but the machined surface could be measured by utilization of autofocusing and intensity methods.

Design and fabrication of a fingerprint imager with compact LED illumination and compact imaging optics.

In this study, we presented a light-emitting diode-based (LED) miniaturized optical pattern imager for slim mobile phone application. To meet volume constraints, we designed a miniaturized compact illuminating and imaging optical component. The objective was to minimize optical loss using several nano- and micro-fabrication methods.

LED beam shaping lens based on the near-field illumination.

This paper presents a novel method in near-field beam shaping based on the precise optical modeling of a gallium nitride light-emitting diode (GaN LED). A Monte Carlo ray tracing simulation has been utilized to calculate the spatial photon distribution near the LED's top. By analyzing the ray data in near-field, the miniaturized lens profile is created and machined with aspherical surfaces and total internal reflection (TIR) Fresnel facets.