1,783 research outputs found
A methodology for strategy-oriented project portfolio selection taking dynamic synergy into considerations
The selection of an optimal project portfolio from multiple project proposals to implement management strategy is always a challenge task for project managers, especially, in the selection of large-scale and complicated projects. This is particular true because project portfolio selection decisions have to be made based on complicated evolution, comprehensive strategic criteria and dynamic synergies. This paper presents a proposed methodology of system dynamic model with consideration of dynamic synergies to predict the value of strategic realization through project portfolio implementation. This method can be applied in the project portfolio selection process, which consists of three procedures: project elimination by resource constraints, project functional value determination and system dynamics approach modelling simulation. In this case, dynamic synergy considerations can help to produce more rational selection results while strategy-oriented selection can ensure that the selected project portfolio aligns with a companyâs strategy. A case study is used to demonstrate the application of the proposed methodology. The results show that the proposed method can help project managers to select an optimal project portfolio with maximal strategic criteria. The proposed method can be incorporated into expert systems in the organizations to enhance the organizational objective priorities in the decision-making process
Plant Homeo Domain Finger Protein 8 Regulates Mesodermal and Cardiac Differentiation of Embryonic Stem Cells Through Mediating the Histone Demethylation of pmaip1
published_or_final_versio
The long run relationship between private consumption and wealth : common and idiosyncratic effects
We investigate the long run relationship between private consump- tion, disposable income and wealth approximated by equity and house price indices for a panel of 15 industrialized countries. Consumption, income and wealth are cointegrated in their common components. The impact of house prices exceeds the effect arising from equity wealth. The long run vector is broadly in line with the life cycle permanent income hypothesis, if house prices are allowed to enter the relationship. At the idiosyncratic level, a long run equilibrium is detected between consumption and income, i.e. the wealth variable can be excluded. The income elasticity in the idiosyncratic relationship is significantly less than unity. Hence, the presence of wealth effects in consumption equations arises from the international integration of asset markets and points to the relevance of risk sharing activities of agents. Without sufficient opportunities, an increase in national saving rates would be expected, leading to a lower path of private consumption expenditures.info:eu-repo/semantics/publishedVersio
Panel stationary tests against changes in persistence
In this paper we propose new panel tests to detect changes in persistence. The test statistics are used to test the null hypothesis of stationarity against the alternative of a change in persistence from I(0) to I(1), from I(1) to I(0), and in an unknown direction. The limiting null distributions of the tests are derived and evaluated in small samples by means of Monte Carlo simulations. An empirical illustration is also provided.Wallenberg Academy Fellowship; The Jan Wallander and Tom Hedelius Foundatio
Superderivations for Modular Graded Lie Superalgebras of Cartan-type
Superderivations for the eight families of finite or infinite dimensional
graded Lie superalgebras of Cartan-type over a field of characteristic
are completely determined by a uniform approach: The infinite dimensional case
is reduced to the finite dimensional case and the latter is further reduced to
the restrictedness case, which proves to be far more manageable. In particular,
the outer superderivation algebras of those Lie superalgebras are completely
determined
Video Fragmentation and Reverse Search on the Web
This chapter is focused on methods and tools for video fragmentation and reverse search on the web. These technologies can assist journalists when they are dealing with fake newsâwhich nowadays are being rapidly spread via social media platformsâthat rely on the reuse of a previously posted video from a past event with the intention to mislead the viewers about a contemporary event. The fragmentation of a video into visually and temporally coherent parts and the extraction of a representative keyframe for each defined fragment enables the provision of a complete and concise keyframe-based summary of the video. Contrary to straightforward approaches that sample video frames with a constant step, the generated summary through video fragmentation and keyframe extraction is considerably more effective for discovering the video content and performing a fragment-level search for the video on the web. This chapter starts by explaining the nature and characteristics of this type of reuse-based fake news in its introductory part, and continues with an overview of existing approaches for temporal fragmentation of single-shot videos into sub-shots (the most appropriate level of temporal granularity when dealing with user-generated videos) and tools for performing reverse search of a video on the web. Subsequently, it describes two state-of-the-art methods for video sub-shot fragmentationâone relying on the assessment of the visual coherence over sequences of frames, and another one that is based on the identification of camera activity during the video recordingâand presents the InVID web application that enables the fine-grained (at the fragment-level) reverse search for near-duplicates of a given video on the web. In the sequel, the chapter reports the findings of a series of experimental evaluations regarding the efficiency of the above-mentioned technologies, which indicate their competence to generate a concise and complete keyframe-based summary of the video content, and the use of this fragment-level representation for fine-grained reverse video search on the web. Finally, it draws conclusions about the effectiveness of the presented technologies and outlines our future plans for further advancing them
Simulation of Vibration Caused by Blasting for a Layered Slope
Recent studies showed that vibration caused by blasting mainly reflects the property of geological
structure itself neighboring the blasting center. Different vibration signals can be collected for
different geological structures under blasting. Hence, vibration signal can be used to identify
geological structure, especial for a slope with a weak layer. As the geological structure for a practical
slope is usually complicated, the simulation of vibration caused by blasting should be carried out first.
Generally, the material in a certain zone near the blasting center will undergo damage, so the physical
model to simulate this region is the most concerned. In this paper, the damaged zone near blasting
center is neglected, and the blasting load can be considered being applied on the interface between
the damaged zone and undamaged zone. Regarding the relations between the weight of explosive,
the size of damaged zone, and the dynamic loading to propagate out away, the vibration caused by
blasting for a practical layered slope is simulated. Compared with the measured signal in site, it can
be seen that the simulating result is in well agreement with that of practical testing. The results also
indicate that the farther the testing point apart from the blasting center, the more accurate the
simulation is
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