• Journal of Welding and Joining
• /
• 제3권2호
• /
• pp.10-15
• /
• 1985

Roughness of the surface to be welded is one of the important factors affecting the weldabilities on the pressure welding. The purpose of this study is to investigate the influences of the surface roughness upon the welding process and the weldability of pressure welds, using Aluminium AA1050 plates treated by various surface polishing The results obtained are as following. 1. The optimum welding deformation is about 38(%)-42(%) in cold pressure weld. 2. The grinding work on the weld surface is superior to milling and paper polishing. 3. Weld pressure must be beyond $0.5kg/mm^2$ in order that the bond may be achieved.

• International Journal of Railway
• /
• 제6권4호
• /
• pp.131-138
• /
• 2013

We have studied the financial performance of Pakistan Railways and found that the financial indicator (net earnings ratio) of Pakistan Railways is consistently decreasing over the years, causing severe financial and operational crises. The implication of our study indicates that the '3Rs' Strategy (retrenchment, repositioning and reorganizing) should be put into practice and furthermore, favorable changes in environmental factors can also contribute towards organizational turnaround. This study would help the Government of Pakistan to think and plan more clearly about turnaround strategies that could improve the performance and growth of Pakistan Railways.

• The Journal of Asian Finance, Economics and Business
• /
• 제7권10호
• /
• pp.641-649
• /
• 2020

The study examines the effect of environmental factors on the international harmonization process of accounting on small and medium enterprises in Vietnam. These factors include legal environment, business environment, and cultural environment. The data is collected by a survey of 100 accountants and 100 auditors on the factors that affects the international harmonization process of accounting. The T-Tests indicate differences between the answers of the accountants and auditors. First, for the accountants, legal environment has the biggest effect on the harmonization process of accounting; while on the auditors, business environment has the biggest influence. Second, while the accountants consider costs higher than benefits in the harmonization process of accounting, the auditors assume that benefits are superior to costs that businesses spend. Third, both the accountants and the auditors indicate that the harmonization process of accounting should not be applied for all small and medium enterprises. From the study results, the author has given a different evaluation method that Vietnam should implement for international harmonization with the required adjustments as per the suitability with the status of businesses in Vietnam. The process of harmonization in accounting practices should not be indiscriminately applied to all the small and medium enterprises either.

• Nuclear Engineering and Technology
• /
• 제49권6호
• /
• pp.1287-1300
• /
• 2017

Based on the observation that ignoring the angle dependency of multigroup resonance cross sections within a fuel pellet would result in nontrivial underestimation of the spatial self-shielding of flux, a parametrized spectral superhomogenization (SPH) factor library (PSSL) method is developed as a practical means of resolving the problem. Region-wise spectral SPH factors are calculated by the normal and transport corrected SPH iterations after ultrafine group slowing down calculations over various light water reactor pin-cell configurations. The parametrization is done with fuel temperature, U-238 number density, fuel radius, moderator source represented by ${\Sigma}_{mod}V_{mod}$, and the number density ratio of resonance nuclides to that of U-238 in a form of resonance interference correction factors. The parametrization is successful in that the root mean square errors of the interpolated SPH factors over the fuel regions of various pin-cells are within 0.1%. The improvement in reactivity error of the PSSL method is shown to be superior to that by the original SPH method in that the reactivity bias of -200 pcm to -300 pcm vanishes almost completely. It is demonstrated that the environment effect takes only about 4% in the reactivity improvement so that the pin-cell based PSSL method is effective in the assembly problems.

• 한국전산구조공학회:학술대회논문집
• /
• 한국전산구조공학회 2005년도 춘계 학술발표회 논문집
• /
• pp.97-104
• /
• 2005

The seismic behavior of framed structure with Chevron-type bucking restrained braces were investigated and their behavior factors were evaluated following the procedure proposed in ATC-19 & ATC-34. Two types of structures, building frame systems and dual systems, with 4, 8, 12, and 16 stories were designed per the IBC 2000, the AISC LRFD and the AISC/SEAOC Recommended Provisions for BRBF. Nonlinear static pushover analyses were carried out to observe the plastic hinge formation and to identify the loads and the displacements at the yield and the ultimate states. Time history analyses were also carried out to compute the permanent displacement md the dissipated hysteretic energy. According to the analysis results, the response modification factors of model structures fumed out to be larger than what is proposed in the provision in low story structures, and a little smaller in medium-story structures. The dual systems, even though designed with smaller seismic load, showed superior static and dynamic performances.

• 한국경영과학회지
• /
• 제19권2호
• /
• pp.229-244
• /
• 1994

In many applications of simulation-optimization, when comparing two or more alternatives, it is crucial to be able to estimate the confidence intervals on the outputs of interest with a reasonable level of accuracy. This acuracy has often been tested by the closeness of the coverage of the estimated confidence interval to the intended coverage. In this paper two variations to the Batch-Means Method of estimating the confidence intervals are presented and their performance are compared with the original method. The results indicate that the Batch Means Method modified by factors obtained by a second order autoregressive method is superior to the original and the one modified based on factors obtained from autocorrelation analysis.

• 한국주거학회논문집
• /
• 제1권2호
• /
• pp.91-101
• /
• 1990

The purpose of this study is to make use of the results, which have been obtained by field survey on the physical elements of daylight enviorment and by research on the subjective response of the students in classrooms, as fundamental data to improve the learning circumstances of classroom. This field survey was made for the students who are doing visual activities most of their time in a classroom formed by luminous environment. Two classrooms of H` Middle School are selected for this study. One is facing the south and the other is facing the east, The classfoom facing the southe was superior in daylight factor and illuminance, while both classrooms were poor in equality. Three factors(brightness, spaciousness, and glare) were drawn in the whole indoor visual environment and two factors(uniformity and reflection) were drawn in the warking plane environment.

• Journal of Electrochemical Science and Technology
• /
• 제7권1호
• /
• pp.1-12
• /
• 2016

The production of oxygen and hydrogen from solar water splitting has been considered to be an ultimate solution for energy and environmental issues, and over the past few years, nano-sized semiconducting metal oxides alone and with graphene have been shown to have great promise for use in photocatalytic water splitting. It is challenging to find ideal materials for photoelectrochemical water splitting, and these have limited commercial applicability due to critical factors, including their physico-chemical properties, the rate of charge-carrier recombination and limited light absorption. This review article discusses these main features, and recent research progress and major factors affect the performance of the water splitting reaction. The mechanism behind these interactions in transition metal oxides and graphene based nano-structured semiconductors upon illumination has been discussed in detail, and such characteristics are relevant to the design of materials with a superior photocatalytic response towards UV and visible light.

• 한국전자파학회:학술대회논문집
• /
• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
• /
• pp.198-202
• /
• 2003

An engineer prefers DIFM receiver which is superior to instantaneous response rather than superheterodyne receiver which has a scan rate in normal wide band receiver designing. But DIFM receiver has weak point in sensitivity and continuous wave signal because of special environments. In this paper we propose the method which is certificated through simulation and prototype testing to improve sensitivity of DIFM receiver. And we analyze the important factors of DIFM receiver from our results.

• Journal of Animal Science and Technology
• /
• 제58권2호
• /
• pp.7.1-7.13
• /
• 2016

Canola meal is derived from the crushing of canola seed for oil extraction. Although it has been used in swine diets for a long time, its inclusion levels have been limited due to concerns regarding its nutritive value primarily arising from results of early studies showing negative effects of dietary canola meal inclusion in swine diets. Such effects were attributable to the presence of anti-nutritional factors (ANF; notably glucosinolates) in canola meal. However, due to advances in genetic improvements of canola that have led to production of cultivars with significantly lower ANF content and improved processing procedures, canola meal with a superior nutritive value for non-ruminant animals is now available. Therefore, the aim of this paper is to review the recent studies in the use of canola meal as feedstuff for swine, the factors influencing its use and the strategies to overcome them. First a historical overview of the development of canola is provided.