Accurate Structural Interpretation Research Articles

The Bibliometric Keywords Network Analysis of Human Resource Management Research Trends: The Case of Human Resource Management Journals in South Korea

Although previous studies on human resource management (HRM) research trends in the global context provided very useful information about the structures of HRM research trends, they have critical limitations. Despite the growing contribution and significance of HRM practices in Korea, a dominant group of scholars has rarely focused on what is going on in the research community in the country. To overcome the limitations and fill the gaps found in studies on the global HRM trends, the purpose of this study is to conduct the keyword network analysis investigating the semantic network structure composed of Korean HRM studies. A total of 1158 research papers published by three top peer-reviewed HRM journals in Korea that were published from 2007 to 2018 were analyzed. The result shows that the whole network structure of Korean HRM has a complex semantic structure that is socially constructed. Additionally, this study identified the top 10 prominent keywords and its ego-centric networks, and nine thematic clusters. By adopting keywords network analysis in bibliometric methods, this study provides an accurate structural interpretation of Korean HRM research practice to facilitate the sustainable development of the studies on the global HRM trends.

Resolution enhancement with relative amplitude preservation for unconventional targets

Our primary objective was to evaluate a method that enhances the resolution of 3D seismic data that does not disturb the relative amplitude preservation. The formations that are the subject of the analysis are Lower Silurian: the Jantar Formation and the Ordovician Sasino Formation (the onshore part of the Baltic Basin, northern Poland). Both formations are seismically thin layers and have been recent targets for unconventional exploration. Resolution enhancement designed to help the structural interpretation may enable precise structural interpretation of thinly layered intervals. The method that we applied is poststack spectral blueing. To verify the effectiveness of the spectral blueing procedure, we designed an algorithm that compares the amplitude values along evenly distributed seismic traces. The algorithm addresses the preservation of the relative amplitude ratio. We did not want to disturb the amplitude values by the enhancement algorithm and introduce information that would be false for seismic inversion analysis. Hence, it was crucial for us to obtain the enhanced seismic volume suitable for structural interpretation that holds relative amplitude relation criterion. The algorithm helped obtain the optimal enhanced seismic volume that is preferable for the structural interpretation of seismic data and possibly could be used successfully for a seismic inversion process. With the optimal enhanced seismic volume, we were able to conduct a more accurate structural interpretation — an entirely new seismic horizon that indicates that the top of one of the formations under analysis was clearly visible and thus possible for interpretation. We applied the acoustic inversion to the original and the enhanced seismic data — the latter enabled the determination of two additional anomalous zones that had not been previously possible to distinguish within the seismic volume.

Benchmark Theoretical and Experimental Study on (15)N NMR Shifts of Oxidatively Damaged Guanine.

The (15)N NMR shifts of 9-ethyl-8-oxoguanine (OG) were calculated and measured in liquid DMSO and in crystal. The OG molecule is a model for oxidatively damaged 2'-deoxyguanosine that occurs owing to oxidative stress in cell. The DNA lesion is repaired with human 8-oxoguanine glycosylase 1 (hOGG1) base-excision repair enzyme, however, the exact mechanism of excision of damaged nucleobase with hOGG1 is currently unknown. This benchmark study on (15)N NMR shifts of OG aims their accurate structural interpretation and calibration of the calculation protocol utilizable in future studies on mechanism of hOGG1 enzyme. The effects of NMR reference, DFT functional, basis set, solvent, structure, and dynamics on calculated (15)N NMR shifts were first evaluated for OG in crystal to calibrate the best performing calculation method. The effect of large-amplitude motions on (15)N NMR shifts of OG in liquid was calculated employing molecular dynamics. The B3LYP method with Iglo-III basis used for B3LYP optimized geometry with 6-311++G(d,p) basis and including effects of solvent and molecular dynamic was the calculation protocol used for calculation of (15)N NMR shifts of OG. The NMR shift of N9 nitrogen of OG was particularly studied because the atom is involved in an N-glycosidic bond that is cleaved with hOGG1. The change of N9 NMR shift owing to oxidation of 9-ethylguanine (G) measured in liquid was -27.1 ppm. The calculated N9 NMR shift of OG deviated from experiment in crystal and in liquid by 0.45 and 0.65 ppm, respectively. The calculated change of N9 NMR shift owing to notable N9-pyramidalization of OG in one previously found polymorph was 20.53 ppm. We therefore assume that the pyramidal geometry of N9 nitrogen that could occur for damaged DNA within hOGG1 catalytic site might be detectable with (15)N NMR spectroscopy. The calculation protocol can be used for accurate structural interpretation of (15)N NMR shifts of oxidatively damaged guanine DNA residue.

Treatment of faults in production simulation models

Abstract This paper describes basic ‘rules-of-thumb’ that offer an indication of common uncertainties and pitfalls, as well as the analytical methods, data requirements and work elements required to replicate the impact of faults on fluid flow in production simulation models successfully. The first, and most important, stage in this modelling process is to ensure that an accurate structural interpretation is incorporated into the simulation model. In particular, that all fault linkages and cross-fault juxtapositions are taken from the seismic interpretation into the simulation grid. Fault rocks sometimes reduce the rate of cross-fault flow in which case it is important to account for this reduction in flow within simulation models. This is best achieved if databases of fault rock properties, measured from the field of interest or nearby similar reservoirs, are up-scaled to calculate fault transmissibility multipliers. It is sometimes necessary to consider not just the single-phase permeability but also the capillary pressure and relative permeability characteristics of the fault rocks present. Finally, all the relevant static and dynamic data must be appraised critically. However, the interpretation of such data is usually non-unique and misinterpretations can create errors in the production-related fault seal analysis. Where these basic guidelines are followed, it has been our experience that the project time required to achieve a history match of production data is dramatically reduced. In addition, as the history match is more geologically reasonable, the model is often more reliable for predicting the long-term behaviour of the reservoir. This gives confidence in the model's forecast to guide development planning and day-to-day field management decisions.

コンゴ沖Ｔｓｈｉａｌａ油田における擬似地震探査記録を用いた貯留層構造解釈

Reservoir structural study was conducted in the offshore Tshiala oil field, Democratic Republic of Congo. In reservoir characterization, accurate structural interpretation is crucial as the reservoir structure is treated as one of hard data.In order to construct high-frequency reservoir model from seismic data, new method for the improvement of seismic resolution was developed. This method, called pseudo-seismic processing, consists of the following steps. High-frequency reflectivity series are derived through the combination of two deconvolution schemes, and then pseudo-seismic traces are generated by convolving an objective wavelet.This procedure enables the reliable correlation of seismic data with the detailed reservoir structure at the well locations, and high-frequency 3D reservoir structure can be interpreted. Constructed model using this method together with geostatistics was proved to be useful as the excellent history matching was achieved in reservoir simulation.

Extending SCAT: Additional Techniques for Identifying Domain Boundaries and Determining How Azimuth Frequency Distribution Varies with Depth: ABSTRACT

For accurate structural interpretation of dipmeter data, it is important to project well bores onto sections correctly. Current methods include the DVA and tangent plots of Bengtson's statistical curvature analysis techniques (SCAT). However, if the well bore crosses domain boundaries, i.e., surfaces across which the projection type (cylindrical or conical) or structural axis changes, all current methods fail: the plots show composite patterns that are difficult to interpret, if not misleading. Thus, methods for detecting domain boundaries, so that data from different domains can be analyzed separately, become important. The authors have developed and extensively tested a rapid, graphical method based on a series of AD plots - plots of apparent dip in arbitrary directions vs. measured depth. (SCAT's T and L plots thus become AD plots in the T and L directions.) In addition, the authors have developed an algorithm for calculating the most likely L direction of a given data set. They apply this calculation to equally spaced intervals and show the results on a separate plot, thereby providing interpreters with another aid for detecting domain boundaries. Another important requirement is to determine how azimuth-frequency distribution (AFD) varies with depth. The traditional method - displaying rose diagrams atmore » equally-spaced intervals - has two drawbacks: first, interpreters must study this display carefully to understand how AFD varies with depth; second, rose diagrams themselves are often misleading. In contrast, only a quick glance at a stack of rectangular historgrams is necessary for determining how AFD varies with depth; moreover, historgrams always depict AFD faithfully.« less

SEISMIC VELOCITIES FROM SURFACE MEASUREMENTS

The purpose of this paper is to discuss field and interpretive techniques which permit, in favorable cases, the quite accurate determination of seismic interval velocities prior to drilling. A simple but accurate formula is developed for the quick calculation of interval velocities from “average velocities” determined by the known [Formula: see text] technique. To secure accuracy a careful study of multiple reflections is necessary and this is discussed. Although the principal objective in determining velocities is to allow an accurate structural interpretation to be made from seismic reflection data, an important secondary objective is to get some lithological information. This is obtained through a correlation of velocities with rock type and depth.