9,926 research outputs found
Sparse recovery with partial support knowledge
No full text14th International Workshop, APPROX 2011, and 15th International Workshop, RANDOM 2011, Princeton, NJ, USA, August 17-19, 2011. ProceedingsThe goal of sparse recovery is to recover the (approximately) best k-sparse approximation [ˆ over x] of an n-dimensional vector x from linear measurements Ax of x. We consider a variant of the problem which takes into account partial knowledge about the signal. In particular, we focus on the scenario where, after the measurements are taken, we are given a set S of size s that is supposed to contain most of the “large” coefficients of x. The goal is then to find [ˆ over x] such that [ ||x-[ˆ over x]|| [subscript p] ≤ C min ||x-x'||[subscript q]. [over] k-sparse x' [over] supp (x') [c over _] S]
We refer to this formulation as the sparse recovery with partial support knowledge problem ( SRPSK ). We show that SRPSK can be solved, up to an approximation factor of C = 1 + ε, using O( (k/ε) log(s/k)) measurements, for p = q = 2. Moreover, this bound is tight as long as s = O(εn / log(n/ε)). This completely resolves the asymptotic measurement complexity of the problem except for a very small range of the parameter s.
To the best of our knowledge, this is the first variant of (1 + ε)-approximate sparse recovery for which the asymptotic measurement complexity has been determined.Space and Naval Warfare Systems Center San Diego (U.S.) (Contract N66001-11-C-4092)David & Lucile Packard Foundation (Fellowship)Center for Massive Data Algorithmics (MADALGO)National Science Foundation (U.S.) (Grant CCF-0728645)National Science Foundation (U.S.) (Grant CCF-1065125
Managing culture at British Airways: hype, hope and reality
No full textYesNearly twenty years after the publication of the (in)famous In Search of Excellence, the
notion of `cultural change¿ within organisations continues to excite attention. This is
readily understandable, since cultural interventions offer practitioners the hope of a
universal panacea to organisational ills and academics an explanatory framework that
enjoys the virtues of being both partially true and gloriously simple. Such a
combination is apparent in the way that many attempts to shape organisational culture
are presented to the public: as simple stories with happy endings.1 This article attempts
to rescue a fairy-tale. The story of British Airways is one of the most widely used
inspirational accounts of changing culture. Throughout the 1980s and 1990s it was
used to demonstrate the necessary compatibility of pleasure and profits2 in celebratory
accounts where culture change is presented as the only explanation for the
transformation that occurred. This corrective makes no attempt to deny the very
substantial changes that took place in BA. Rather, it sets these in context noting the
organisation¿s environment at the time of the transformation, the structural changes
that took place and observes the impact that such changes had over the long term.3¿
Boundary Algebra: A Simpler Approach to Boolean Algebra and the Sentential Connectives
No full textBoundary algebra [BA] is a algebra of type , and a simplified notation for Spencer-Brown’s (1969) primary algebra. The syntax of the primary arithmetic [PA] consists of two atoms, () and the blank page, concatenation, and enclosure between ‘(‘ and ‘)’, denoting the primitive notion of distinction. Inserting letters denoting, indifferently, the presence or absence of () into a PA formula yields a BA formula. The BA axioms are A1: ()()= (), and A2: “(()) [abbreviated ‘⊥’] may be written or erased at will,” implying (⊥)=(). The repeated application of A1 and A2 simplifies any PA formula to either () or ⊥. The basis for BA is B1: abc=bca (concatenation commutes & associates); B2, ⊥a=a (BA has a lower bound, ⊥); B3, (a)a=() (BA is a complemented lattice); and B4, (ba)a=(b)a (implies that BA is a distributive lattice). BA has two intended models: (1) the Boolean algebra 2 with base set B={(),⊥}, such that () ⇔ 1 [dually 0], (a) ⇔ a′, and ab ⇔ a∪b [a∩b]; and (2) sentential logic, such that () ⇔ true [false], (a) ⇔ ~a, and ab ⇔ a∨b [a∧b]. BA is a self-dual notation, facilitates a calculational style of proof, and simplifies clausal reasoning and Quine’s truth value analysis. BA resembles C.S. Peirce’s graphical logic, the symbolic logics of Leibniz and W.E. Johnson, the 2 notation of Byrne (1946), and the Boolean term schemata of Quine (1982).Boundary algebra; boundary logic; primary algebra; primary arithmetic; Boolean algebra; calculation proof; G. Spencer-Brown; C.S. Peirce; existential graphs
Strategic plans and long-range plans: is there a difference?
No full textAn analysis of both form and content differences between the plans named “strategic” and those named “long-range”.
Planning theory is checked against the planning reports available on the Web pages of 65 public and university libraries. The goal is to see whether the differences that some theorists observe between strategic and long-range planning actually exist on
plans published with those names.Publicad
‘Ba’ for effective knowledge management: in the era of digitalization in construction organisations
No full textThis study aims to explore what design of ‘ba’, the Japanese concept which translates into ‘place’ or ‘space’ in English, facilitates effective knowledge creation in construction organisations. Although many scholars have investigated the field of knowledge management in construction organisations, few have focused on ‘ba’, where the knowledge creation process takes place (Nonaka & Takeuchi, 1998). ‘Ba’ is defined as ‘a shared context in which knowledge is shared, created and utilised (Nonaka et al., 2000)’, and ‘ba’ can be physical (e.g. meeting rooms), virtual (e.g. e-mails), and even mental space (e.g. shared values). Although ‘ba’ has been recognised as the essential part of knowledge creation, it is not fully clear what design of ‘ba’ can facilitate organisational knowledge creation better due to its ambiguity and intractability. Moreover, new ICT tools have emerged and used for ‘ba’ since the concept was first introduced in the 1990s, and the COVID-19 pandemic has accelerated the use of virtual environments in business. Also, few examined the impact of individuals’ traits such as generational differences in values and Belbin team roles on ‘ba’. Therefore, exploring ‘ba’ in accordance with the above aspects can contribute to enhancing knowledge creation in organisations. This research is divided into three parts: literature study, qualitative data collection and analysis, and recommendations. In the literature study, the conceptual model of ‘ba’ is reconstructed based on the extant literature in order to clarify the nature of ‘ba’. The model suggests the nature of ‘ba’ is “a shared space given meaning by inter-subjective relationships and inter-corporeal relationships”. Moreover, the four categories of enabling conditions that stimulate ‘ba’ are identified, namely social/behavioural, cognitive/epistemic, information systems, and strategy/structure. Subsequently, the empirical data obtained by semi-structured interviews with East Japan Railway Company show both physical and virtual ‘ba’ are used in the organisation. Comparing physical ‘ba’ with virtual ‘ba’, most informants described that physical ‘ba’ that allows face-to-face communication is appropriate for knowledge creation activities. Sharing the physical space allows participants to convey their ideas adequately with inter-corporeal interaction. As the construction industry heavily depends on tacit knowledge due to its intrinsic nature, the environment where tacit knowledge conversion is easily taken place is considered effective for knowledge creation. Also, focusing on individuals’ characteristics specifically generation differences and Belbin orientation, these variables do not affect the perception of ‘ba’ that facilitates knowledge creation. On the other hand, organisational tenure may indirectly influence the perception of ‘ba’ since most of the interviewees have worked for a long time within the same organisation and the organisation’s values and philosophy can be steeped in their minds as their tenures increased. Finally, recommendations were developed to facilitate the knowledge-creating process by combining the results of the literature study and empirical study. The following three key recommendations were proposed: design 'ba' with corporeality; complement the lack of corporeality; Clarify the meaning of ‘ba’. Civil Engineering | Construction Management and Engineerin
Ultra-low-power Digitally-controlled Oscillator for Event-driven Transmitter
No full textEvent-driven wireless communication is a promising concept that presents new challenges to designers. For an event-driven transmitter, achieving high efficiency under the condition of ultra-low-power (ULP) consumption is one of the most critical tasks. It places emphasis on the importance of carrier generation. This is the motivation of this thesis, which mainly focuses on designing a ULP digitally-controlled oscillator (DCO) for event-driven transmitters.Electrical Engineering (track: Microelectronics)Microelectronics & Computer EngineeringElectrical Engineering, Mathematics and Computer Scienc
A Geographical Approach to The Tourism Potential of Cami Bo az High Plateau and Çak rgöl in View of Protection-Usage Balance
No full textGünümüzde baz k rsal yöreler, turistik aktivitenin yo unla t
mekânlar olarak dikkati çeker. Özellikle turizm sezonunu uzatma aray , bu
sahalar ve do al kaynaklar üzerindeki bask n n giderek artmas na neden
olmaktad r. Kalkanl Da lar üzerindeki plato düzlüklerinde bulunan Cami
bo az yaylas ve Çak rgöl çevresi (Trabzon-Gümü hane illeri) de yüksek bir da
turizmi potansiyeline sahiptir. Do al çevre özellikleri, hem yaz ve hem de k
turizmine olanak tan r.
Yöre çok uzun zamandan beri hayvanc l k ekonomisine dayal yaylac l k
sahas olarak kullan lmaktad r. Ancak son y llarda ya anan sosyo-ekonomik
de i im süreci, klâsik yaylac l da etkilemi tir. Buna ba l olarak turistik
i levlerin ön plâna ç kmaya ba lad gözlemlenmektedir. Yakla k 2200-3000 m
yükselti ku a nda bulunan da l k alan yayla turizmi, ekoturizm, klimatizm,
alpinizm, k rsal turizm, göl turizmi ve k turizmi gibi potansiyel olanaklara
sahiptir. Buna kar n günümüzde daha çok piknik, kampç l k ve yürüyü gibi
rekreasyonel etkinlikler yap lmaktad r. Yörede 80 yatak kapasiteli 5 konaklama
tesisi, 1 f r n, 4 kasap ve 4 bakkal dükkân mevsimlik faaliyet göstermektedir. Söz
konusu tesislerde ise 30 personel istihdam edilmektedir. Büyük ölçüde yerli
turistlerin günübirlik olarak hafta sonlar nda u rad klar saha, sadece yaz
mevsiminde kullan lmaktad r. K turizminin geli tirilmesi için de Kültür ve
Turizm Bakanl taraf ndan Çak rgöl K Turizm Merkezi olarak ilân edilmi tir.
Tespitlerimize göre, yap lan çal malar yo un bir kitle turizminin ortaya
ç kmas na zemin haz rlayacakt r. Oysaki hassas ekosistemler olan da l k
alanlarda, daha çok çevreye duyarl bir turizmi te vik etmek gerekir. Buna ba l
olarak yerel halk , do al/kültürel ortam özelliklerini ve turist beklentilerini içeren
bir turizm plânlamas yap lmal d r. Böyle bir yakla m, koruma-kullanma
dengesinin sa lanabilmesi aç s ndan son derece önemlidir. Aksi takdirde koruma-kullanma ikilemi, do al ve kültürel ortam bozulmalar n h zland racakt r.At present, some rural areas attract attention as places with a focus on
touristic activity. The effort to lengthen the tourism season causes an increase on
the pressure on such areas and natural resources. Cami Bo az High Plateau and
Çak rgöl (Within Trabzon and Gümü hane borders) located on the plateaus on
Kalkanl Mountains have a high mountain tourism potential. Their natural
characteristics make them suitable for summer and winter tourism.
The area has long been used as an area for animal husbandry. However,
in recent years there has been a socio-economic change and tourism activities
have come to the fore. At an altitude of almost 2200-3000 meters, there is
potential for high-plateau tourism, ecotourism, climatism, alphinism, rural
tourism, lake tourism and winter tourism. Yet, today mostly picnic, camping and
walking activities are preferred. 5 hotels with 80 beds, 1 baker, 4 butchers, 4
grocers run seasonally in the area. 30 personnels are employed in those places of
employment. Mostly domestic tourists visit the area daily at weekends in
summers. Çak rgöl was declared as a place of winter tourism by Culture and
Tourism Ministry in order to develop winter tourism.
The efforts spent will create the emergence of mass tourism. Yet, a
tourism with sensitivity on the environment must be initiated on mountainous
areas which are sensitive ecosystems. And accordingly a tourism planning
containing local people, natural/cultural characteristics and expectations of
tourists must be carried out. Such an approach is crucial for maintaining
protection-usage dilemma will increase the damage on natural and cultural
surroundings
Ba Win and Pete Baumann
No full textSelected excerpts from an event at which Ba Win and Pete Baumann were the guest speakers. The full transcript may be restricted. To request access contact the Simon’s Rock College Archives.
Ba Win: Mrs. Hall told me that she thought that a variant on even a good American high schools might be possible based on her conversations with her alumnae, her Concord graduates who had come back to visit her, and she asked them how are things going, and these young women at the best schools in America, they would say “Fine, it’s OK.” without much enthusiasm but she knew they were doing well, and when she dug further she found that what had happened was that she had a bunch of bright students at Concord, and she had great teachers working for her, and in a private school you don’t have to conform to state standards, you can do whatever you want within reason, and what had happened was that... the teachers would raise the bar and the students would respond to the teachers raising the bar and on and on it went. So much so that it wasn’t until their sophomore or even their junior years that her Concord Academy students really encountered real work, that without meaning to, they had anticipated the first two years of college, and they had gone into it, and so it really brought to Mrs. Hall the question about the convention that 18 year olds are only supposed to be doing this much, in fact her 18 year old students were doing a whole lot more than that.
Ba Win: For years and years and years, after the original campus was built, and it was a very nice new campus, we did not have sophisticated facilities. Science was taught with a piece of chalk, photo labs were as basic as they could be, but basic as they were, 3 weeks ago in the New York Times, they had a series of winter scenes in the city, 10 pictures, utterly beautiful, all [by] Simon’s Rock [alumni Jan Staller ‘70] At a time when we had very primitive performance facilities we nevertheless produced the Coen Brothers, Ethan and Joel Coen, so we’ve had extraordinary people come out of this place. We have more than a piece of chalk now to do the sciences, and that’s how it should be, when you recruit the most talented people that you can find you owe them the appropriate facilities but the tradition of really teaching, not just using bells and whistles, has persisted.
Pete Baumann: I thought of an idea, wouldn’t it be nice to put a little water in [the Library Atrium] or something or something like that so I dug a ditch and got some stones and river rocks, and put in some black plastic and some water. [...] Ace who was there by himself, and one of the guys decided, you know, throw in a couple extra frogs and he ate them, except for one, and that one survived and we called him Deuce. Deuce had a little bit of a problem, he couldn’t swim well, he couldn’t swallow well and I had to kind of hand feed him, and everyone would come in and take pictures of the frogs, little kids would come in with their parents, maybe brothers and sisters, maybe prospective students. I used to bring them out and show them the frogs, well some of these little kids grew up and became students at Simon’s Rock, graduated, and brought their kids in, that’s how long. The two bullfrogs were in there for 15 years, Ace and Deuce were, and they were very tame, the bullfrogs were, the students used to pick them up and pet them, and if the students were sitting there the frogs would come out and sit right there between them like they were part of the conversation, it was really something.
Ba Win: Betty Hall was very successful at Concord Academy at a time when the women\u27s voice was very nascent, she was one of the people who by being a strong leader was showing that generation who were at school with her that all the usual rules and limitations should not apply, they were ridiculous, they should fall away. But she was also of an older style, she would begin a meeting by saying “Ladies” and when she started Simon’s Rock she had one foot in her mother\u27s generation and one foot in the next generation. It’s important to remember that she started the school in the second half of the 60s when questioning authority was very much en vogue. She took care to hire younger teachers, she did not want to hire very experienced people because she was sure once they came they would revert to what they were familiar with, she wanted something new and as a result she went out and hired a whole lot of recently minted MA and PhDs, but they were also stepping out of the 60s having just come out of college where protests and demands were commonplace, so, basically Betty collided with the 60s and she found it really, really hard. In many ways the form of education that she proposed was transformative, it was very different, it wasn’t you sit there obediently and silently and I’ll tell you and you record it, and of course if you have questions I’m happy to answer. It was going from that to challenging everything.https://digitalcommons.bard.edu/sr-oral_hist/1002/thumbnail.jp
Étude aux rayons X, par diffraction neutronique et par effet Mössbauer des solutions solides Ba(FexGa1-x) 2O4
No full textWe have studied by X rays, neutron diffraction and Mössbauer effect the solid solution Ba(Fe xGa1-x)2O4. As in the study of the solid solution Ba(FexAl1 -x)2O4, we have found a critical concentration x c = 0.41. When xc < xc, Ba(Fe xGa1-x)2O4 does not present long range magnetic order but behaves as paramagnetic fine particles. When xc < x < 0.8, an antiferromagnetic arrangement takes place with the spins along the c axis of the hexagonal cell.Nous avons étudié aux rayons X, par diffraction neutronique et effet Môssbauer, la solution solide Ba(FexGa1-x) 2O4. Comme pour l'étude de la solution solide Ba(Fe xAl1-x)2O4, nous avons mis en évidence une concentration critique xc = 0,41. Si x < x c, il n'y a pas d'ordre magnétique à longue distance mais un comportement de grains fins superparamagnétiques. Si xc < x < 0,8, il existe un arrangement antiferromagnétique des spins selon l'axe c de la maille hexagonale
Immigrants and electoral enrolment: Do the numbers add up?
No full textAbstract: The electoral enrolment of immigrants is important for effective democracy. Electoral rolls also provide useful administrative data on the age, regional distribution, and intercensal movements of the eligible voting population. An understanding of the enrolment patterns of recent immigrants provides information on the political integration of a section of the permanent resident population, and the electoral roll’s coverage of this group.This paper presents findings on the political participation of recent immigrants to New Zealand, with a focus on their level of electoral enrolment. It uses data from the Longitudinal Immigration Survey: New Zealand (LisNZ), which asked panel participants who remained at wave 3 whether they were on the electoral roll and had voted. The overall electoral enrolment rate of participants was compared with that of the total New Zealand population, and their profiles examined to identify those characteristics associated with enrolment. Survey regression analysis was used to identify variables that were significantly related to electoral enrolment. Recent immigrants were considerably less likely to be enrolled than members of the total population, with 11.6 percent not enrolled after three years of permanent residence. The factors most significant for enrolment were region of origin, New Zealand citizenship, and overall satisfaction. Also significant were application category, marital status, and home ownership. With non-citizen permanent residents having full voting rights in New Zealand, and an annual target of some 45,000 new approvals, the under-enrolment of recent immigrants shows that the numbers do not add up and there needs to be further focus on increasing the political integration of recent immigrants to New Zealand
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