There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

The American Society for Testing and Materials (ASTM) is an independent organization devoted to the development of standards.

American Society for Testing and Materials

비만아 부모의 돌봄 경험: q 방법론

The retinal prosthesis is aimed to restore partial vision to the blind affected by outer retinal degenerative diseases. Almost all research efforts rely on a dual-unit system, with components internal and external to the human body, including a video camera, an inductive wireless link for power and/or data transfer between the external and internal components, a processing microchip, and a stimulating electrode array. In this paper, we discuss modeling and computational methods to calculate the electromagnetic interaction of some of the system components with the head tissues. Specifically, we will focus on two aspects of the system: the safety considerations of an inductive link operating at the carrier frequency of 10 MHz and the current spread in the retina under different conditions.

Bioelectromagnetics for a Retinal Prosthesis to Restore Partial Vision to the Blind

Microelectronics Design for an Implantable High Density Retinal Prosthesis

Current treatments for meibomian gland dysfunction have several limitations, creating a necessity for other advanced treatment options. The purpose of this study is to determine the effectiveness o...

Focused ultrasound stimulation on meibomian glands for the treatment of evaporative dry eye.

Developing an Improved Method to Evaluate Retinitis Pigmentosa Patients for the Argus II Retinal Prosthesis System

Using the technique of Kelvin force microscopy, we have performed the first measurements of photovoltages from single photosynthetic reaction centers. The measured values, typically 1 V or more, are sufficiently large to trigger a neural response. The goal of the project is insertion of purified Photosystem I (PSI) reaction centers or other photoactive agents into retinal cells where they will restore photoreceptor function to people who suffer from age-related macular degeneration (AMD) or retinitis pigmentosa (RP), diseases that are the leading causes of blindness world-wide. Although the neural wiring from eye to brain is intact, these patients lack photoreceptor activity. It is the ultimate goal of this proposal to restore photoreceptor activity to these patients using PSI as the optical trigger. In principle, the approach should work. PSI is a robust integral membrane molecular photovoltaic device. Depending on orientation, it can depolarize or hyperpolarize the cell membrane with sufficient voltage to trigger an action potential.

Mark S. Humayun

Papers

Bioelectromagnetics for a Retinal Prosthesis to Restore Partial Vision to the Blind

Microelectronics Design for an Implantable High Density Retinal Prosthesis

Focused ultrasound stimulation on meibomian glands for the treatment of evaporative dry eye.

Developing an Improved Method to Evaluate Retinitis Pigmentosa Patients for the Argus II Retinal Prosthesis System

Biomolecular optoelectronic devices and their application to artificial sight