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Báo cáo toán học: "An improved bound on the minimal number of edges in color-critical graphs" pot

Báo cáo toán học: "An improved bound on the minimal number of edges in color-critical graphs" pot

... k−1 (1) The second ingredient of our proof is the following result of Stiebitz Lemma ([5]) Let G be a k-critical graph containing at least one vertex of degree k − Then the number of connected ... 1) 2(k (5) the electronic journal of combinatorics (1998), #R4 as claimed A more detailed treatment of the problem, containing lower and upper bounds on the minimal number of edges in a k-critical ... journal of combinatorics (1998), #R4 Let r be the number of connected components of H(G), then trivially |E(H(G))| ≥ nH − r (2) Also, by Lemma 3, the number of connected components of L(G) is...

Ngày tải lên: 07/08/2014, 06:22

4 344 0
Factors affecting the helping behaviors of employees in ivac

Factors affecting the helping behaviors of employees in ivac

... Establishing and maintaining the relationships with countries, governmental and nongovernmental organizations and individuals in the region and around the world in the training and research in the ... expenditures in the following order: - Deducting at least 25% for setting up the nonbusiness operation development fund; - Paying increased incomes to laborers The payment of increased incomes to ... interests of, laborers in terms of wages, remunerations, social insurance, health insurance, P a g e 16 professional training and retraining in accordance with the provisions of law - To organize the...

Ngày tải lên: 10/12/2015, 00:10

59 247 1
Báo cáo khoa học: Esculentin-1b(1–18) – a membrane-active antimicrobial peptide that synergizes with antibiotics and modifies the expression level of a limited number of proteins in Escherichia coli doc

Báo cáo khoa học: Esculentin-1b(1–18) – a membrane-active antimicrobial peptide that synergizes with antibiotics and modifies the expression level of a limited number of proteins in Escherichia coli doc

... (p0), the peptide (0.1–2 lm) was injected into the subphase, and the increment in surface pressure of the LPS film upon intercalation of the peptide dissolved in the subphase was monitored for the ... 0.5 indicates synergy; see Experimental procedures] To obtain insights into the mode of action underlying the synergistic activity, we investigated the bactericidal action of the combination of ... (Fig 10) The exposure of · 107 cellsÆmL)1 at the corresponding MIC of Esc(1–18) resulted in an irregular rod form with a deep wrinkling of the cell surface (within min) However, all of these changes...

Ngày tải lên: 16/03/2014, 00:20

18 494 0
báo cáo hóa học:" Prevalence of visual impairment in relation to the number of ophthalmologists in a given area: a nationwide approach" ppt

báo cáo hóa học:" Prevalence of visual impairment in relation to the number of ophthalmologists in a given area: a nationwide approach" ppt

... to eighteen strata [24] The probability of selecting an institution was inversely proportional to the number of institutions in its stratum and proportional to its number of beds Eight subjects ... (number of subjects in the institution /number of available beds), and the answer refusal rate (higher in psychiatric centres) In 1998, 2,075 institutions were selected and 155 of them (7.5%) refused ... size of household, type of household and geographical area size based on the latter survey For the institution survey, weights included size of strata, the institution occupation rate (number of...

Ngày tải lên: 20/06/2014, 15:20

8 445 0
Báo cáo toán học: "A LOWER BOUND FOR THE NUMBER OF EDGES IN A GRAPH CONTAINING NO TWO CYCLES OF THE SAME LENGTH" pptx

Báo cáo toán học: "A LOWER BOUND FOR THE NUMBER OF EDGES IN A GRAPH CONTAINING NO TWO CYCLES OF THE SAME LENGTH" pptx

... v(G) denote the number of vertices, and (G) denote the number of edges In this paper, we construct a graph G having no two cycles with the same length which leads to the following result Theorem ... 32t − 17t+1 Then f (n) ≥ n + 32t − 1, for n ≥ nt This completes the proof of the theorem From the above theorem, we have f (n) − n 2562 √ ≥ 2+ , n 6911 √ 487 which is better than the previous ... [5] Chunhui Lai, On the size of graphs with all cycle having distinct length, Discrete Math 122(1993) 363-364 [6] Chunhui Lai, The edges in a graph in which no two cycles have the same length, J...

Ngày tải lên: 07/08/2014, 06:22

6 477 0
Báo cáo toán học: " On the chromatic number of intersection graphs of convex sets in the plane" ppt

Báo cáo toán học: " On the chromatic number of intersection graphs of convex sets in the plane" ppt

... considered colorings of graphs in the class U of intersection graphs of unit disks in the plane They proved that finding chromatic number of graphs in U is an NP -complete problem In [6, 18], and ... derive Theorem Proof of Theorem Let A be a member of a set M = {Mi } of translates of a centrally symmetric convex set in the plane such that the clique number of the intersection graph H(M) of M ... also sharp Then we consider a more general setting: shrinking and blowing of the figures are now allowed Theorem Let H be the intersection graph of a family F of homothetic copies of a fixed convex...

Ngày tải lên: 07/08/2014, 08:20

12 356 0
Báo cáo toán học: "Bounding the number of edges in permutation graphs" pdf

Báo cáo toán học: "Bounding the number of edges in permutation graphs" pdf

... number of edges in Γπ,0 equals the number of permutations σ that are covered by π in the strong Bruhat1 order on Sn , and the number of edges in Gπ,0 equals the degree of the vertex π in the Hasse2 ... and the proof of Theorem 1.2 Edge bounds in Gπ,s In this section we prove Theorem 1.3, which gives bounds on the maximum number of edges in Gπ,s with π ∈ Sn Proof of Theorem 1.3 We start with the ... obtain an upper bound on the size of such graphs The last section of the paper contains some concluding remarks the electronic journal of combinatorics 13 (2006), #R44 Maximum number of edges in...

Ngày tải lên: 07/08/2014, 13:21

9 381 0
Báo cáo toán học: "The maximum number of perfect matchings in graphs with a given degree sequence" docx

Báo cáo toán học: "The maximum number of perfect matchings in graphs with a given degree sequence" docx

... contribution to the permanent) Thus the square of the number of perfect matchings is at most the permanent of the adjacency matrix, and the desired inequality follows from Bregman-Minc by taking the square ... permutation of rows and columns A is a block diagonal matrix in which each block is a square all-1 matrix Proof of Theorem 1.1: The square of the number of perfect matchings of G counts ordered pairs of ... every cycle of length exceeding in H there are two ways to decide which edges came from M1 and which from M2 The permanent of the adjacency matrix A of G also counts the number of spanning 2-regular...

Ngày tải lên: 07/08/2014, 15:22

2 367 0
Báo cáo toán học: "The crossing number of a projective graph is quadratic in the face–width" doc

Báo cáo toán học: "The crossing number of a projective graph is quadratic in the face–width" doc

... version of Theorem 1.1 Theorem 3.4 If G embeds in the projective plane with face–width at least r ≥ 6, then the crossing number crg (G) of G in the plane is at least 36 r Estimating the crossing number ... -times since we have a free choice of selecting the remaining Mg − cycles from C to form C ⊇ {e, f } of size Mg + Hence the counting argument yields that the k k−2 total number of crossings in D ... We remark that cr0 , the crossing number in the sphere, coincides with the “usual” crossing number in the plane Our strategy for proving Theorem 1.1 is to show the existence of sufficiently large...

Ngày tải lên: 07/08/2014, 15:23

8 336 0
Báo cáo toán học: "On the Number of Matchings in Regular Graphs" pptx

Báo cáo toán học: "On the Number of Matchings in Regular Graphs" pptx

... all these choices to get the numerator of the right-hand side of (4.10) Divide this number of choices by the number of permutations of {1, , rn} to deduce the lemma Using the methods in the ... shows the inequality between the last term of the first line and the first term in the second line of (3.10) For graphs consisting of more than two cycles or paths there is no total ordering by ... denote A := r Ai Let m ∈ min(p, q) Then permm A is the number i=1 of m-matchings of G := ∨r Gi , which is equal to the number of m-matchings obtained i=1 in the following way Consider m1 , ...

Ngày tải lên: 07/08/2014, 21:20

28 263 0
Báo cáo toán học: "The Ramsey number of diamond-matchings and loose cycles in hypergraphs" potx

Báo cáo toán học: "The Ramsey number of diamond-matchings and loose cycles in hypergraphs" potx

... reduces the problem of finding the Ramsey number of a path or a cycle to finding the Ramsey number of a connected matching An additional - usually technical - difficulty is that the coloring is not on the ... and prove the Ramsey-type form of our main result, it determines the exact value of the Ramsey number of a diamond-matching the electronic journal of combinatorics 15 (2008), #R126 Theorem For ... proof In fact, the proof method of Theorem can be copied to determine the 3-colored Ramsey number of the diamond-matching as well Theorem For every k ≥ 1, r ≥ 2, R(kDr , kDr , kDr ) = 2kr − Proof...

Ngày tải lên: 07/08/2014, 21:20

14 311 0
Báo cáo toán học: "The number of elements in the mutation class of a quiver of type Dn Aslak Bakke Buan" pps

Báo cáo toán học: "The number of elements in the mutation class of a quiver of type Dn Aslak Bakke Buan" pps

... inversion of tags This is a generalization of the method used in [T] to count the number of elements in the mutation class of quivers of Dynkin type An Here we are strongly using the ideas in ... loops the electronic journal of combinatorics 16 (2009), #R49 ′ ǫ ǫ The crossing number e(Ma,b , Nc,d ) is the minimal number of intersection of represenǫ ǫ′ tations of Ma,b and Nc,d in the interior ... Corollary 5.8 The number d(n) of elements in the mutation class of any quiver of type Dn is equal to the number of triangulations of the punctured regular n polygon up to rotations and inverting all...

Ngày tải lên: 07/08/2014, 21:21

23 300 0
Báo cáo toán học: "Counting the number of elements in the ˜ mutation classes of An −quiver" ppt

Báo cáo toán học: "Counting the number of elements in the ˜ mutation classes of An −quiver" ppt

... sum, instead of the three-fold sum stated in the main theorem Finally, at the end of Section we prove the formula for the number of quivers in the mutation class of type Dn , by exhibiting an ... Additionally, we obtain the number of quivers in the mutation class of a quiver of Dynkin type Dn This formula was first determined in [5]: Corollary The number of quivers of type Dn , for n ≥ ... particular, the weight of Q depends only on the orientation of the base arrow and on the total number of vertices and 3-cycles of Q Passing to generating functions, the electronic journal of combinatorics...

Ngày tải lên: 08/08/2014, 14:23

23 271 0
the relationships among emotional intelligence, leadership styles and perfprmance of employees in enterprise in hanoi, vietnam

the relationships among emotional intelligence, leadership styles and perfprmance of employees in enterprise in hanoi, vietnam

... occupations The northern part of Vietnam was strongly influenced by the Chinese culture due to 1,000 years of dominance of the Chinese feudalism In general, the Vietnamese people are hospitable and industrious ... vision of the future for organizations which grow continuously Visionary for leaders should create inspiring and innovative visions their organizations rendering them credible in the eyes of the people ... involvement of the group member in the mission, challenging goals of the group member and belief in the accomplishment of the mission Later, these nine effects were statistically clustered into three...

Ngày tải lên: 22/08/2014, 20:07

107 399 0
FACTORS AFFECTING JOB PERFORMANCE AN INVESTIGATION OF EMPLOYEES IN THE VIETNAMESE BANKING INDUSTRY

FACTORS AFFECTING JOB PERFORMANCE AN INVESTIGATION OF EMPLOYEES IN THE VIETNAMESE BANKING INDUSTRY

... Unfortunately, the demand of banking employees is forecasted to be in the down –trend in the next few years According to the point of view of specialists in banking industry, many banks will cut off the employees ... impact on the job performance, the result indicated that the belonging needs is the factor has the highest impact on the job performance in the point of view of employees in banking industry in Viet ... comparing with the total sample This study gives an interesting result about the number of years of the respondents With the number of years at the bank in the range from to 10 years Most of respondents...

Ngày tải lên: 01/06/2015, 20:09

69 576 0
FACTORS INFLUENCING ON THE JOB COMMITMENT OF EMPLOYEES AT  INTERNATIONAL HOTELS IN HANOI: AN EXPLORATORY STUDY

FACTORS INFLUENCING ON THE JOB COMMITMENT OF EMPLOYEES AT INTERNATIONAL HOTELS IN HANOI: AN EXPLORATORY STUDY

... Reporting the results of data analysis, o Discussing the findings  Chapter 3: Recommendations o Proposing recommendations according to the achieved findings, o Discussing future trends of the ... towards his/her organization originating from weighing the costs and benefits associated with leaving, and  the sense of obligation to maintain in the organization 17 1.2.2 Levels of job commitment: ... the willingness to exert efforts to remain with the organization (Reichers, 1985) The only reason that makes employees stay is that they are taking the costs of leaving into consideration, in...

Ngày tải lên: 29/06/2015, 09:52

105 461 0
A new direction in the study of the orientation number of a graph

A new direction in the study of the orientation number of a graph

... L in kin g Cp ’s a n d Cq , q > p, b y e d g e s L in kin g n Cp ’s a n d Cq , q > p, b y n + e d g e s , wh e r e n ≥ 1 2) Linking gr aphs with edges so as to attain some ... e a d d e d t o n d is jo in t g r a p h s wit h m in im iz in g t h e d ia m e t e r o f t h e r e s u lt in g g r a p h in m in d A s − → d ( k) is a d e c r e a s in g fu n c t io n o f k, ... a in e d wh e n p e d g e s a re a d d e d b e t we e n Kp a n d Cp in o f a p e r fe c t m a t c h in g In a t h e m e t h a t will fe a t u r e p r o m in e n t ly fo r t h e r e m a in in...

Ngày tải lên: 12/09/2015, 21:07

226 350 0
Determinants of the loyalty of employees in businesses

Determinants of the loyalty of employees in businesses

... loyalty is the "intention or desire to maintain membership of the organization" Mowday's famous definition of loyalty is similar to the concept of "Maintain" in the research of Aon Consulting Institute ... LITERATURE REVIEW 2.1 Theoretical literature: 2.1.1 Approaches in the study of the loyalty of employees: There are many approaches in the study of the loyalty of employees in businesses Loyalty can ... management of human resources of the businesses 1.3 Research questions: The research aims to address the following questions: (1) What are the determinants of the loyalty of employees in businesses in...

Ngày tải lên: 24/09/2015, 16:18

64 366 0
The relationships among emotional intelligence, leadership styles and perfprmance of employees in enterprise in hanoi, vietnam

The relationships among emotional intelligence, leadership styles and perfprmance of employees in enterprise in hanoi, vietnam

... playing the vital role in the performance of the leaders and the efficiency of leadership skills 1.2 STATEMENT OF THE PROBLEM This study attempts to examine the relationship between ... employed for the purposes of this study Step 1: Administer Questionares to both the leader and subordinate in the enterprises in Ha noi Step 2: Capture the data and inspect the data using descriptive ... Summary of Findings There exists a relationship between leadership styles and employee performance The results of the linear regression analysis indicate that, at the 5% level of significance, there...

Ngày tải lên: 09/05/2016, 20:18

15 146 1
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