Ada T. Lim

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System security as it is practiced today is a losing battle. In this paper, we outline a possible comprehensive solution for binary-based attacks, using virtual machines, machine descriptions, and randomization to achieve broad heterogeneity at the machine level. This heterogeneity increases the "cost" of broad-based binary attacks to a sufficiently high(More)
Aberrant responses to dopamine consequent to a reduction of D1-like receptors in critical regions of the brain have been implicated in schizophrenia. Whereas estrogen may protect against the onset and incidence of psychosis in the illness, the neurobiological effects of the ovarian steroid remain unclear. Recently we have shown that estrogen augments the(More)
L-Glutamate, a major excitatory amino acid of the central nervous system, plays important roles as neurotransmitter and neuromodulator in the brain. Increasing evidence suggests that glutamate may also involve in the regulation of the neuroendocrine system at the hypothalamus. Employing long term monolayer hypothalamic cell cultures prepared from neonatal(More)
At the 1999 Workshop on Hot Topics in Operating Systems (HotOS VII), the attendees reached consensus that the most important issue facing the OS research community was " No-Futz " computing; eliminating the ongoing " futzing " that characterizes most systems today. To date, little research has been accomplished in this area. Our goal in writing this paper(More)
Increasing evidence now suggests that more than one subtype of dopamine receptors is co-expressed in some of the central neurons. The neurobiological effects on the host cells when these receptors are concurrently activated by their common physiological ligand, dopamine, however, remains elusive. Among the members of the family of dopamine receptors,(More)
Inhibin is a gonadal glycoprotein hormone that regulates the production of follicle-stimulating hormone (FSH) by the anterior pituitary gland and exhibits intragonadal actions as well. The present study shows that inhibin-like immunoreactivity (inhibin-LI) is present in cells of the cytotrophoblast layer of human placenta at term and in primary cultures of(More)
Besides acting as an important cofactor in the biosynthesis of catecholamine, ascorbic acid (AA) also modulates the activity of peptidylglycine-alpha-amidating monooxygenase for the post-translational modification of neuropeptides such as alpha-MSH and TRH. We report here a novel action of AA in modulating the secretion of immunoreactive beta-endorphin(More)
It is now evident that hypothalamic beta-endorphin (beta EP) modulates reproductive physiology at the central level by inhibiting the function of neurons producing gonadotropin-releasing hormone (GnRH). Increasing evidence suggests that gonadal steroids, which play an important role in the long-loop negative feedback on the hypothalamus-pituitary-gonadal(More)
In the hypothalamus of the rat, the precursor of atrial natriuretic peptide (ANP) is produced and processed into its smaller congeners of 3K mol wt species, which are secreted from neurons with cell bodies in the periventricular areas and the paraventricular nuclei of the tissue. Employing long term monolayer cultures of neonatal rat hypothalamic cells, we(More)