102 research outputs found
Towards supervisory control theory in tactical environments: a stackelberg game approach
No full textIn this paper, we propose a new framework for supervisory control of discrete-event systems in tactical environments. In contrast to the standard supervisory control theory, where the environments are considered fully adversarial, we consider the possibility of the presence of attackers who have their own objectives that may not necessarily be in opposition to the specification of the supervisor. We formulate this scenario as a Stakelberg game in the leader-follower setting, where the designer proposes a supervisor, and the attacker takes a best response to the supervisor. We characterize the solution to the Stakelberg supervisory control problem as having both cooperative and antagonistic solutions. Moreover, we provide an effective algorithm for synthesizing a cooperative supervisor that enables both players to achieve their objectives. Our work makes an initial step forward from the traditional zerosum setting of supervisory control theory to the non-zero-sum setting. Examples are provided to illustrate our results
Micythus torquentus Cui 2023, sp.nov.
No full textMicythus torquentus sp.nov. Type material: Holotype male, Chengmai, Hainan Province, China, April 2020, leg. Xinghui Chen. Paratype: 1m, Chengmai, Hainan Province, China, April 2020, leg. Xinghui Chen; 2f, Chengmai, Hainan Province, China, March 5 th, 2022, leg. Xinghui Chen. Etymology. The species is named according to its twisted RTA. Diagnosis. This new species is similar to M. pictus (Thorell,1897), but male can be distinguished from the warp on RTA, and the shape of the conductor. RTA of the new species is rectangular and a bit bifurcated at the end in retrolateral view, but cuneate in M.pictus; RTA is obviously twisted in ventral view. Tibiae I, II only spined on the ventral side. Female of the new species is a bit similar to M. rangunensis (Thorell, 1895), but they can be distinguished from the shape of the spermathecae. Spermathecae in M. rangunensis is sausage-like (Deeleman-Reinhold, 2001), but in the new species it becomes obviously constricted in the middle. Description (Figures 1–2). Male holotype (Figure 1A, Figure 2) total length 5.19. Carapace orange, length 2.36, width 1.80, length/width 1.31; Thoracic groove brown; radial groove dark grey, forked; fovea deep, longitudinal, black line shaped. AME-AME=0.04, AME-ALE=0.03, PME-PME=0.08, PME-PLE=0.04. AER strongly procurved. PER nealry straight, white. Chelicerae anteriorly with long setae, promargin with three teeth, retromargin with a small tooth. Labium tongue-shaped, longer than wide, brown, the upper end less colored with macrosetae. Endites light brown, longer than wide, anterior edge white, hollow in the middle. Sternum orange, oval, with small setae and coxa apophysis. Legs the same color with the carapace. Leg III with a shallow notch on trochanter, trochanter IV with a deep notch. Leg spination pattern (following Song et al., 2004): femora: I, II d1-1-1, p0-1-1; III d1-1-1, p0-1-1, r0-1-1; IV d1-1-1, r0-0-1; patellae: none; tibiae: I, II v0-1-1; III p2-1-1, r0-1-1, v2-2-2;IV p1-0-1, r1-0-1, v2-2-2; metatarsi: I, II v2-0-0; III d0-2-0,p1-0-1, r1-0-1, v2-2-2; IV d0-2-2, p1-1-0, r0-1-1, v2-2-2. Leg formula: 4123. Metatarsus I, II and tarsus I, II with ventral scopula; tarsal claws thin. Leg measurements: Abdomen grey, length 2.25, width 1.47, length/width 1.53, with a small triangular dorsal scutum. Spinnerets long, light brown. Male palp (Figure 2): tibia short, as long as wide, with a tongue-shaped retrolateral apophysis in retrolateral view. RTA evidently curved, with furcating terminal end. Tegulum narrow; seminal duct U-shaped. Embolus short. Conductor thin and curved. Median apophysis unconspicuous. Female (Figures 1B–D) total length 6.17. Carapace length 2.97, width 2.23, length/width 1.33. AME-AME 0.08, AME-ALE 0.02, PME-PME 0.13, PME-PLE 0.14. Abdomen length 3.12, width 2.09, length/width 1.49. Leg measurements: I 6.05 (1.84, 2.30, 1.12, 0.79); II 6.19 (1.87, 2.31, 1.19, 0.82); III 6.16 (1.81, 2.15, 1.36, 0.84); IV 8.01 (2.23, 2.81, 2.11, 0.86). Leg fomula: 4231. Appearance of cephalothorax as male. Epigyne (Figures 1C–D) nearly U-shaped in ventral view. Spermathecae long, divided into two lobes, the ventral one larger. The second pair of spermathecal lobes thick-walled, bubble-shaped. Copulatory opening almost oval.Published as part of Cui, Bohan, 2023, A new species of genus Micythus Thorell, 1897 (Araneae: Gnaphosidae) from Hainan, China, pp. 397-400 in Zootaxa 5301 (3) on pages 397-398, DOI: 10.11646/zootaxa.5301.3.5, http://zenodo.org/record/803053
Atlanta’s Desegregation Era Social Studies Curriculum: An Examination of Georgia History Textbooks
No full textAuthor accepted manuscript version of a chapter published in:
Bohan, C. H. & Randolph, P. (2012). Desegregation era social studies curriculum: An examination of Georgia History textbooks. Chapter seven in C. Woyshner and C. H. Bohan (Eds.) Histories of social studies and race, 1890–2000. (pp. 135−158). New York: Palgrave MacMillan.</p
Network properties data and code used in "Ecological plasticity governs ecosystem services in multilayer networks".
No full textCode and network properties data used in the analyses presented in "Ecological plasticity governs ecosystem services in multilayer networks". Further information can be requested of the author David A. Bohan ([email protected])
Estimating interactions of functional brain connectivity by Hidden Markov models
No full textThe brain activity reflected by functional magnetic resonance imaging (fMRI) is temporally organized as a combination of sensory inputs from environment and its own spontaneous activity. However, temporal patterns of brain activity in a large number of subjects remain unclear. We propose a regularized hidden Markov model (HMM) to estimate dynamic functional connectivity among distributed brain regions and discover repeating connectivity patterns from resting-state functional connectivity across a group of subjects. We found that functional brain connectivity are hierarchically organized and exhibit three repeated patterns across subjects with attention deficit hyperactivity disorder (ADHD). We have examined the temporal characteristics of functional connectivity by its occupancy. And we validated our method by comparing the classification performance with state-of-the-art methods using the same dataset. Experimental results show that our method can improve the classification performance compared to other functional connectivity modelling methods
Preliminary Evaluation for Major Health Risks of Heavy Metals in Drinking Water Sources of Huainan City in China
No full textAnalysis on the Negative Impact of AI Development on Employment and Its Countermeasures
No full textWhile benefiting society, the technological progress of artificial intelligence (AI) has also brought a rising number of unemployed people and breeded polarization in income distribution by threatening the low-skill and labor-intensive industry. To solve the negative impact of AI, policies about the taxation and subsidy on AI and the income-supporting program can be proposed. However, neither of them will work well to achieve sustainable social development. In the long run, technological progress will not be influenced by government policies, and capital will find its own path to a rapid growth. Income-supporting programs are short-term solutions, being ineffective and not sustainable. Based on the literature collected, the author came up with two practical methods to deal with the negative impact brought by AI to employment: the industrial relocation as a short-term solution and the reframing of the education system as a long-term solution
Modified titanium post with polished sidewalls and prefabricated shoulders can effectively preserve the teeth with subgingival defects
No full textAbstract Objective of this study was to examine the clinical efficacy and mechanical characteristics of the modified titanium post in the restoration of subgingival defect teeth. Teeth with subgingival defects depth ≥ 2 mm were randomly restored using a fiber post after crown lengthening and a modified titanium post, respectively. Gingival index, sulcus bleeding index, probing depth, tooth mobility, and gingival papilla height were recorded before and after restoration. Tooth models with a 4 mm subgingival defect, which then underwent fiber post restoration after crown lengthening and modified titanium post restoration respectively, was established. The stresses in the tooth and tooth-supporting structures were measured under vertical and horizontal loads. The gingival index, sulcus bleeding index, and probing depth in the titanium post groups did not show significant differences compared to those of the crown lengthening group. However, the tooth mobility, gingival papilla height, and stress distribution in the tooth and periodontal tissue were significantly better in the titanium post than those in crown lengthening group. Teeth restored with modified titanium post had a healthy periodontal status, clinical efficacy and stress distribution in dental and periodontal tissues were superior to the teeth restored with crown lengthening. However, longer term observation was still needed
The Research on the Valuation of Chinese Internet Companies------Based On DCF-BS Method
No full textThe concept of "Internet plus" was first mentioned in NPC &CPPCC (National People Congress and Chinese People Political Consultative Conference) in 2015. With the advent of Internet Plus era, the development of Internet industry has been accelerating. At the same time, the issue of how to accurately assess the value of Internet enterprises is widely valued.
In 1963, Modigliani and Miller established a cash flow discount model. This model is rapidly becoming the core of modern enterprise value assessment due to its practicality and universality. However, the high uncertainty of future earnings of Internet enterprises, light assets, and reliance on customer traffic make traditional enterprises' value assessment methods no longer fully applicable to Internet enterprises. Therefore, determined the scientific and reasonable value assessment method system, which might facilitate the continuous development of the Internet industry, and help investors make better investment decisions is very important and urgent for Internet enterprises.
The academic community now have different opinions on the determination of the value evaluation method of Internet enterprises. Some scholars believe that the basic position of cash flow discount method in the valuation of Internet enterprises cannot be changed. Some scholars point out that the basic position of cash flow discount method has changed. In some cases, it not only underestimates the future profit opportunities of Internet companies, but also fails. The author believes that the latter is more reasonable. Therefore, this dissertation proposes to combine the cash flow discount method with the real option method to evaluate the value of the enterprise. This paper makes empirical analysis of seven Internet companies, contrasts with the results of a single cash flow discount method, and then find one method which closer to the actual result. So as to determine a scientific and effective method of Internet enterprise value evaluation. Finally, the author gives the future researchers some suggestions about internet company valuation methods
The Research on the Valuation of Chinese Internet Companies------Based On DCF-BS Method
No full textThe concept of "Internet plus" was first mentioned in NPC &CPPCC (National People Congress and Chinese People Political Consultative Conference) in 2015. With the advent of Internet Plus era, the development of Internet industry has been accelerating. At the same time, the issue of how to accurately assess the value of Internet enterprises is widely valued.\ud
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In 1963, Modigliani and Miller established a cash flow discount model. This model is rapidly becoming the core of modern enterprise value assessment due to its practicality and universality. However, the high uncertainty of future earnings of Internet enterprises, light assets, and reliance on customer traffic make traditional enterprises' value assessment methods no longer fully applicable to Internet enterprises. Therefore, determined the scientific and reasonable value assessment method system, which might facilitate the continuous development of the Internet industry, and help investors make better investment decisions is very important and urgent for Internet enterprises.\ud
\ud
The academic community now have different opinions on the determination of the value evaluation method of Internet enterprises. Some scholars believe that the basic position of cash flow discount method in the valuation of Internet enterprises cannot be changed. Some scholars point out that the basic position of cash flow discount method has changed. In some cases, it not only underestimates the future profit opportunities of Internet companies, but also fails. The author believes that the latter is more reasonable. Therefore, this dissertation proposes to combine the cash flow discount method with the real option method to evaluate the value of the enterprise. This paper makes empirical analysis of seven Internet companies, contrasts with the results of a single cash flow discount method, and then find one method which closer to the actual result. So as to determine a scientific and effective method of Internet enterprise value evaluation. Finally, the author gives the future researchers some suggestions about internet company valuation methods
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