1,710 research outputs found
Conditioned by Dress – The Relationship between Mind, Fashion, Film & Performance.
This is the first monograph in the Pocket Book Series Practices of Transdisciplinarity, a co-publishing collaboration between the ArtEZ Academy in the Netherlands and the London College of Fashion. 'Practices of Transdisciplinarity' examines creative research practices that cross the traditional boundaries assigned to art and design disciplines.
Anna-Nicole Ziesche's: Conditioned by Dress - The Relationship between Mind, Fashion, Film and Performance' opens the series.
This combined visual and text-based publication is the first book to present an overview of Anna-Nicole Ziesche’s films. Her early work investigates methods for composing fashion ‘looks’, using simple film editing techniques to manipulate, magnify and repeat the decorative details of cloth onto the body. We discover her unique research process that uses story telling and performance to explore the relationship between self-perception and dress. Anna-Nicole is also a sculptor; she re-constructs her dreams, building installations in which she subjects the body to poetic narratives inspired by her experiences of fashion. Within these installations Anna-Nicole and her ‘dressed’ characters perform both physically and psychologically. Film and photography are mediums where "to dress" takes on a new meaning.
[from the Foreword, by Lucy Orta
Search for massive protostar candidates in the southern hemisphere: II. Dust continuum emission
In an ongoing effort to identify and study high-mass protostellar candidates
we have observed in various tracers a sample of 235 sources selected from the
IRAS Point Source Catalog, mostly with dec < -30 deg, with the SEST antenna at
millimeter wavelengths. The sample contains 142 Low sources and 93 High, which
are believed to be in different evolutionary stages. Both sub-samples have been
studied in detail by comparing their physical properties and morphologies.
Massive dust clumps have been detected in all but 8 regions, with usually more
than one clump per region. The dust emission shows a variety of complex
morphologies, sometimes with multiple clumps forming filaments or clusters. The
mean clump has a linear size of ~0.5 pc, a mass of ~320 Msolar for a dust
temperature Td=30 K, an H_2 density of 9.5E5 cm-3, and a surface density of 0.4
g cm-2. The median values are 0.4 pc, 102 Msolar, 4E4 cm-3, and 0.14 g cm-2,
respectively. The mean value of the luminosity-to-mass ratio, L/M ~99
Lsolar/Msolar, suggests that the sources are in a young, pre-ultracompact HII
phase. We have compared the millimeter continuum maps with images of the mid-IR
MSX emission, and have discovered 95 massive millimeter clumps non-MSX
emitters, either diffuse or point-like, that are potential prestellar or
precluster cores. The physical properties of these clumps are similar to those
of the others, apart from the mass that is ~3 times lower than for clumps with
MSX counterpart. Such a difference could be due to the potential prestellar
clumps having a lower dust temperature. The mass spectrum of the clumps with
masses above M ~100 Msolar is best fitted with a power-law dN/dM proportional
to M-alpha with alpha=2.1, consistent with the Salpeter (1955) stellar IMF,
with alpha=2.35.Comment: 83 pages, 10 figures, 3 tables. Accepted for publication by A&A. The
full paper, including Fig.2 with the maps of all the individual regions,
complete Tables 1 and 2 can be found at
http://www.arcetri.astro.it/~starform/publ2005.ht
BMP is an important regulator of proepicardial identity in the chick embryo
AbstractThe proepicardium (PE) is a transient structure formed by pericardial coelomic mesothelium at the venous pole of the embryonic heart and gives rise to several cell types of the mature heart. In order to study PE development in chick embryos, we have analyzed the expression pattern of the marker genes Tbx18, Wt1, and Cfc. During PE induction, the three marker genes displayed a left–right asymmetric expression pattern. In each case, expression on the right side was stronger than on the left side. The left–right asymmetric gene expression observed here is in accord with the asymmetric formation of the proepicardium in the chick embryo. While initially the marker genes were expressed in the primitive sinus horn, subsequently, expression became confined to the PE mesothelium. In order to search for signaling factors involved in PE development, we studied Bmp2 and Bmp4 expression. Bmp2 was bilaterally expressed in the sinus venosus. In contrast, Bmp4 expression was initially expressed unilaterally in the right sinus horn and subsequently in the PE. In order to assess its functional role, BMP signaling was experimentally modulated by supplying exogenous BMP2 and by inhibiting endogenous BMP signaling through the addition of Noggin. Both supplying BMP and blocking BMP signaling resulted in a loss of PE marker gene expression. Surprisingly, both experimental situations lead to cardiac myocyte formation in the PE cultures. Careful titration experiments with exogenously added BMP2 or Noggin revealed that PE-specific marker gene expression depends on a low level of BMP signaling. Implantation of BMP2-secreting cells or beads filled with Noggin protein into the right sinus horn of HH stage 11 embryos resulted in downregulation of Tbx18 expression, corresponding to the results of the explant assay. Thus, a distinct level of BMP signaling is required for PE formation in the chick embryo
Deterministic Fully Dynamic SSSP and More
We present the first non-trivial fully dynamic algorithm maintaining exact
single-source distances in unweighted graphs. This resolves an open problem
stated by Sankowski [COCOON 2005] and van den Brand and Nanongkai [FOCS 2019].
Previous fully dynamic single-source distances data structures were all
approximate, but so far, non-trivial dynamic algorithms for the exact setting
could only be ruled out for polynomially weighted graphs (Abboud and
Vassilevska Williams, [FOCS 2014]). The exact unweighted case remained the main
case for which neither a subquadratic dynamic algorithm nor a quadratic lower
bound was known.
Our dynamic algorithm works on directed graphs, is deterministic, and can
report a single-source shortest paths tree in subquadratic time as well. Thus
we also obtain the first deterministic fully dynamic data structure for
reachability (transitive closure) with subquadratic update and query time. This
answers an open problem of van den Brand, Nanongkai, and Saranurak [FOCS 2019].
Finally, using the same framework we obtain the first fully dynamic data
structure maintaining all-pairs -approximate distances within
non-trivial sub- worst-case update time while supporting optimal-time
approximate shortest path reporting at the same time. This data structure is
also deterministic and therefore implies the first known non-trivial
deterministic worst-case bound for recomputing the transitive closure of a
digraph.Comment: Extended abstract to appear in FOCS 202
Fully Dynamic Shortest Path Reporting Against an Adaptive Adversary
Algebraic data structures are the main subroutine for maintaining distances
in fully dynamic graphs in subquadratic time. However, these dynamic algebraic
algorithms generally cannot maintain the shortest paths, especially against
adaptive adversaries. We present the first fully dynamic algorithm that
maintains the shortest paths against an adaptive adversary in subquadratic
update time. This is obtained via a combinatorial reduction that allows
reconstructing the shortest paths with only a few distance estimates. Using
this reduction, we obtain the following:
On weighted directed graphs with real edge weights in , we can
maintain approximate shortest paths in
update and query time. This improves upon the approximate distance
data structures from [v.d.Brand, Nanongkai, FOCS'19], which only returned a
distance estimate, by matching their complexity and returning an approximate
shortest path.
On unweighted directed graphs, we can maintain exact shortest paths in
update and query time. This
improves upon [Bergamaschi, Henzinger, P.Gutenberg, V.Williams, Wein, SODA'21]
who could report the path only against oblivious adversaries. We improve both
their update and query time while also handling adaptive adversaries.
On unweighted undirected graphs, our reduction holds not just against
adaptive adversaries but is also deterministic. We maintain a
-approximate -shortest path in
time per update, and -approximate single source shortest paths in
time per update. Previous deterministic results by
[v.d.Brand, Nazari, Forster, FOCS'22] could only maintain distance estimates
but no paths
Fast Deterministic Fully Dynamic Distance Approximation
In this paper, we develop deterministic fully dynamic algorithms for
computing approximate distances in a graph with worst-case update time
guarantees. In particular, we obtain improved dynamic algorithms that, given an
unweighted and undirected graph undergoing edge insertions and
deletions, and a parameter , maintain
-approximations of the -distance between a given pair of
nodes and , the distances from a single source to all nodes
("SSSP"), the distances from multiple sources to all nodes ("MSSP"), or the
distances between all nodes ("APSP").
Our main result is a deterministic algorithm for maintaining
-approximate -distance with worst-case update time
(for the current best known bound on the matrix multiplication
exponent ). This even improves upon the fastest known randomized
algorithm for this problem. Similar to several other well-studied dynamic
problems whose state-of-the-art worst-case update time is , this
matches a conditional lower bound [BNS, FOCS 2019]. We further give a
deterministic algorithm for maintaining -approximate
single-source distances with worst-case update time , which also
matches a conditional lower bound.
At the core, our approach is to combine algebraic distance maintenance data
structures with near-additive emulator constructions. This also leads to novel
dynamic algorithms for maintaining -emulators that improve
upon the state of the art, which might be of independent interest. Our
techniques also lead to improved randomized algorithms for several problems
such as exact -distances and diameter approximation.Comment: Changes to the previous version: improved bounds for approximate st
distances using new algebraic data structure
Algorithm and Hardness for Dynamic Attention Maintenance in Large Language Models
Large language models (LLMs) have made fundamental changes in human life. The
attention scheme is one of the key components over all the LLMs, such as BERT,
GPT-1, Transformers, GPT-2, 3, 3.5 and 4. Inspired by previous theoretical
study of static version of the attention multiplication problem [Zandieh, Han,
Daliri, and Karbasi arXiv 2023, Alman and Song arXiv 2023]. In this work, we
formally define a dynamic version of attention matrix multiplication problem.
There are matrices , they represent query,
key and value in LLMs. In each iteration we update one entry in or . In
the query stage, we receive as input, and want to
answer , where is a square matrix and is a diagonal matrix. Here denote a length- vector
that all the entries are ones.
We provide two results: an algorithm and a conditional lower bound.
On one hand, inspired by the lazy update idea from [Demetrescu and
Italiano FOCS 2000, Sankowski FOCS 2004, Cohen, Lee and Song STOC 2019, Brand
SODA 2020], we provide a data-structure that uses
amortized update time, and
worst-case query time.
On the other hand, show that unless the hinted matrix vector
multiplication conjecture [Brand, Nanongkai and Saranurak FOCS 2019] is false,
there is no algorithm that can use both amortized update time, and worst query
time.
In conclusion, our algorithmic result is conditionally optimal unless hinted
matrix vector multiplication conjecture is false
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