Biomedical subjects

J I Khan

Publications and source records attributed to J I Khan.

6 recordsLinked to original sources

PubMed2006

Control of electron localization in molecular dissociation.

We demonstrated how the subcycle evolution of the electric field of light can be used to control the motion of bound electrons. Results are presented for the dissociative ionization of deuterium molecules (D2 --> D+ + D), where asymmetric ejection of the ionic fragment reveals that light-driven intramolecular electronic motion before dissociation localizes the electron on one of the two D+ ions in a controlled way. The results extend subfemtosecond electron control to molecules and provide evidence of its usefulness in controlling reaction dynamics.

Journal Article↗

PubMed1996

Paraffinoma revisited: a post-operative condition following rhinoplasty nasal packing.

Paraffin impregnated tulle is frequently used as a post-operative dressing after surgical repair of wounds, on skin-donor sites and in packing of tissue cavities. Historically, paraffin has been injected into various sites of the body and paraffinoma is a well-described complication. Despite this, nasal packing with paraffin gauze is still common after rhinoplasty. We report a case of paraffinoma occurring after rhinoplasty and discuss the avoidance of this rare but serious complication and suggest silicon mesh as an alternative dressing.

Adult↗

PubMed1994

Facelift surgery: an adjunct in the treatment of capillary malformations (port wine stains).

Hemangiomas and lymphangiomas remain the most common benign tumors seen by the plastic surgeon that involve a neonate's skin and deeper tissues. A significant number of tumors undergo spontaneous regression and require no treatment. The port wine stain (PWS) remains one of the most difficult variants of hemangiomas to treat and continues to be psychologically traumatic throughout a patient's lifetime. Recently, advanced use of laser technology has yielded beneficial results for a significant number of these patients. This report illustrates the incorporation of facelift surgery as an adjunct in the overall management of older patients resulting in decreased use of cosmetics and great improvement in general well being.

Facial Dermatoses↗

PubMed1993

Koebner's phenomenon in burns: another complication following thermal injury.

The Koebner phenomenon is an uncommon postburn complication. The following report describes the emergence of viral warts on the hand of a child, 6 months after sustaining a superficial scald. The aetiology and immunological implications are discussed.

Burns↗

PubMedDate not supplied

Pectoralis major ruptures postsuction lipectomy for surgical management of gynecomastia.

Over the last decade, suction-assisted lipoplasty has been shown to be a safe and reliable procedure in the hands of trained individuals. A large number of plastic surgeons employ liposuction as an adjunct to surgery for gynecomastia with excellent results and low morbidity. An unusual problem, traumatic rupture of the pectoralis major muscle, has been observed by us in a patient who had undergone the procedure. The physical deficit arising from the injury may go unnoticed in all but the most physically active people, and surgeons should be wary of the possibility of this previously unreported complication.

Adult↗

PubMedDate not supplied

Holographic image archive.

This paper presents an associative technique for content-based retrieval into image archive, based on a computing paradigm called Multidimensional Holographic Associative Computing (MHAC). Unlike any prior Artificial Associative Memory (AAM), MHAC has the unique ability fo focus on any subject of pixels in the sample image and retrieve learned images based on the similarity of the visual objects. In addition, MHAC is adaptive, graciously accommodative of imprecision, efficient, parallelizable, scalable and optically realizable. Together, these excellent properties of MHAC offer a promising novel approach to a content-based search into massive image archives. The paper presents the necessary transformational steps to incorporate this new mechanism into a complete image archival and retrieval system. This is the first associative search approach for content-based retrieval in image repository. The results show that this search system is capable of retrievals by using pattern objects as small as 10-15% of the query image frame at better than 90% accuracy. This demonstrates the potential of MHAC for handing contest-based image applications far beyond the capability of current associative memories. The design, methodology and performance of this system have been illustrated in this paper through its application in managing a Medical Image Archive (MEDIA).

Algorithms↗