2,957 research outputs found
Password Cracking and Countermeasures in Computer Security: A Survey
With the rapid development of internet technologies, social networks, and
other related areas, user authentication becomes more and more important to
protect the data of the users. Password authentication is one of the widely
used methods to achieve authentication for legal users and defense against
intruders. There have been many password cracking methods developed during the
past years, and people have been designing the countermeasures against password
cracking all the time. However, we find that the survey work on the password
cracking research has not been done very much. This paper is mainly to give a
brief review of the password cracking methods, import technologies of password
cracking, and the countermeasures against password cracking that are usually
designed at two stages including the password design stage (e.g. user
education, dynamic password, use of tokens, computer generations) and after the
design (e.g. reactive password checking, proactive password checking, password
encryption, access control). The main objective of this work is offering the
abecedarian IT security professionals and the common audiences with some
knowledge about the computer security and password cracking, and promoting the
development of this area.Comment: add copyright to the tables to the original authors, add
acknowledgement to helpe
A photochemical flow reactor for large scale syntheses of aglain and rocaglate natural product analogues
Published in final edited form as: Bioorg Med Chem. 2017 Dec 1; 25(23): 6197–6202. Published online 2017 Jun 11. doi: [10.1016/j.bmc.2017.06.010]Herein, we report the development of continuous flow photoreactors for large scale ESIPT-mediated [3+2]-photocycloaddition of 2-(p-methoxyphenyl)-3-hydroxyflavone and cinnamate-derived dipolarophiles. These reactors can be efficiently numbered up to increase throughput two orders of magnitude greater than the corresponding batch reactions.Financial support from Boston University and National Institutes of Health (ABB R33AI105944) is gratefully acknowledged. We thank Dr. Norman Lee (Boston University) for high-resolution mass spectrometry data. NMR (CHE-0619339) and MS (CHE-0443618 facilities at Boston University are supported by the NSF. (Boston University; ABB R33AI105944 - National Institutes of Health; CHE-0619339 - NSF; CHE-0443618 - NSF)Accepted manuscrip
Remember me, remember us, remember Korea
행사명 : U.S.-Korea Academic Symposiu
Early onset preeclampsia is characterized by altered placental lipid metabolism and a premature increase in circulating FABP4
Preeclampsia is a pregnancy-associated disorder that manifests as a sudden increase in maternal blood pressure accompanied by proteinuria. Because the placenta is a key organ in preeclampsia, we used proteomic and lipidomic analyses to compare placentae from preeclamptic and gestational age matched control pregnancies. Fatty acid binding protein 4 (FABP4), enoyl-CoA dehydrogenase and delta-3,5-delta-2,4-dienoyl-CoA isomerase had altered abundance in preeclamptic placentae compared to controls. FABP4 placental protein and RNA and plasma levels were all increased in early-onset preeclampsia (prior to 28 weeks gestation) compared to controls (6-fold, 3.3-fold and 3.5-fold respectively). After 28 weeks, FABP4 protein in control placenta and plasma increased to the same concentrations as in preeclampsia. Total tetracosapentaenoic acid in preeclamptic placentae was decreased to 0.6 of control levels before 28 weeks. The data indicate a disruption of fatty acid transport and metabolism in the placenta in early onset preeclampsia that is reflected in the maternal plasma
Towards the Inclusion of Inter-Ethnic Studies in Comparative Literature in China
In their article Towards the Inclusion of Inter-Ethnic Studies in Chinese Comparative Literature Xiaoqing Han and Aaron Lee Moore advocate for the inclusion of inter-ethnic studies in Chinese comparative literature. The traditional definition for many Chinese comparative literature scholars continues to confine the discipline to inter-national or cross-civilization studies rather than including inter-ethnic studies, and Chinese ethnic minority writing continues to be underrepresented in the national literary canon. This article is in no way opposed to the continued growth and development of a Chinese national literature. But rather, it seems crucial that inter-ethnic studies should be included in the discipline of Chinese comparative literature, considering the fact that there are 55 officially recognized and registered Chinese minorities (少数民族), constituting nearly 8.5% (113 million) of the total population of China, each with their own distinct and rich cultural heritage and literary tradition
Efficient Prior-Free Mechanisms for No-Regret Agents
We study a repeated Principal Agent problem between a long lived Principal
and Agent pair in a prior free setting. In our setting, the sequence of
realized states of nature may be adversarially chosen, the Agent is non-myopic,
and the Principal aims for a strong form of policy regret. Following Camara,
Hartline, and Johnson, we model the Agent's long-run behavior with behavioral
assumptions that relax the common prior assumption (for example, that the Agent
has no swap regret). Within this framework, we revisit the mechanism proposed
by Camara et al., which informally uses calibrated forecasts of the unknown
states of nature in place of a common prior. We give two main improvements.
First, we give a mechanism that has an exponentially improved dependence (in
terms of both running time and regret bounds) on the number of distinct states
of nature. To do this, we show that our mechanism does not require truly
calibrated forecasts, but rather forecasts that are unbiased subject to only a
polynomially sized collection of events -- which can be produced with
polynomial overhead. Second, in several important special cases -- including
the focal linear contracting setting -- we show how to remove strong
``Alignment'' assumptions (which informally require that near-ties are always
broken in favor of the Principal) by specifically deploying ``stable'' policies
that do not have any near ties that are payoff relevant to the Principal. Taken
together, our new mechanism makes the compelling framework proposed by Camara
et al. much more powerful, now able to be realized over polynomially sized
state spaces, and while requiring only mild assumptions on Agent behavior
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