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Austine Efut Ofem,Godwin Chidi Ugwunnadi,Ojen Kumar Narain,Jong Kyu Kim 경남대학교 기초과학연구소 2023 Nonlinear Functional Analysis and Applications Vol.28 No.3
In this article, we introduce the hyperbolic space version of a faster iterative algorithm. The proposed iterative algorithm is used to approximate the common fixed point of three multi-valued almost contraction mappings and three multi-valued mappings satisfying condition $(E)$ in hyperbolic spaces. The concepts weak $w^2$-stability involving three multi-valued almost contraction mappings are considered. Several strong and $\triangle$-convergence theorems of the suggested algorithm are proved in hyperbolic spaces. We provide an example to compare the performance of the proposed method with some well-known methods in the literature.
Austine D. D’Souza,Shrikantha S. Rao,Mervin A. Herbert 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.9
A vast majority of the research on friction stir welding(FSW) is mainly focused on welding of aluminium alloys. The researchstudies in this paper are based on one such alloy known as Al–Ce–Si–Mg aluminium alloy, of which, the microstructure andother mechanical properties of the friction stir welded joints are yet to be studied. The plates of Al–Ce–Si–Mg aluminiumalloy were friction stir welded using a non consumable, rotating tool with triangular profile pin and circular shoulder, withdifferent combinations of tool rotation speeds and weld speeds. The microstructure, hardness and mechanical properties ofthe weld were analyzed. The microstructure of the weld zones revealed that, the average grain size at the bottom of the NuggetZone (NZ) is 5 ± 0.12 μm and gradually increases to 15 ± 0.23 μm at the top of the NZ. In the TMAZ the grain size is20 ± 0.14 μm and is bigger compared to the NZ. In the HAZ, the grain size is around 37 ± 0.21 μm and is bigger than that inthe TMAZ. The maximum Vickers hardness value at the NZ center is 231.9 ± 2 Hv, and uniformly reduces to 100 ± 2.4 Hvin the TMAZ and 65 ± 1.3 Hv in the HAZ and then increases to 98 ± 1 Hv in the base material (BM). The maximum ultimatetensile strength (UTS) of FSW joint was found to be around 102.55 ± 3 MPa with elongation at fracture of 2.5%. The BMUTS was 154 ± 4.5 MPa. For a tool rotation speed of 800RPM and a weld speed of 20 mm/min a maximum joint efficiencyof 67%. was obtained. Hence these were chosen as the optimum process parameters to join the alloy Al–Ce–Si–Mg by FSW.
Female Director and Tax Aggressiveness of Listed Insurance Firms: Insights from Nigeria
Sunday Oseiweh OGBEIDE,Austine ODILU 한국웰빙융합학회 2019 웰빙융합연구 Vol.2 No.1
This study empirically examined the effect of female director on tax aggressiveness of listed insurance firms in Nigeria. The main objective of this research was to empirically investigate the effect of female board members on tax aggressiveness, determine the composition and representation of female directors on the board of insurance companies, find out how tax aggressive are listed insurance firms and apply the BLAU (1977) index method to measure female director representation as a departure from conventional approaches specifically in the Nigerian context in the reference period, 2014 to 2018. The population of the study consists of all the quoted insurance firms as at 31st December, 2016. A sample of twenty eight (28) quoted insurance firms was selected and data were collected over the period. Inferential statistic consisting of the General Method of Moment was used for the data analysis. The results obtained reveal that board size is negative and exerts significant impact on tax aggressiveness in insurance firms in Nigeria. The study therefore recommends that the Federal government has to come up with a policy to respond to the marginalization of female on the insurance firm corporate board in Nigeria. The aim of this policy thrust should be targeted at reducing politics and biasness against women on the corporate boards of listed insurance firms.
Female Director and Tax Aggressiveness of Listed Insurance Firms: Insights from Nigeria
Sunday Oseiweh OGBEIDE,Austine ODILU 한국웰빙융합학회 2019 웰빙융합연구 Vol.2 No.2
This study empirically examined the effect of female director on tax aggressiveness of listed insurance firms in Nigeria. The main objective of this research was to empirically investigate the effect of female board members on tax aggressiveness, determine the composition and representation of female directors on the board of insurance companies, find out how tax aggressive are listed insurance firms and apply the BLAU (1977) index method to measure female director representation as a departure from conventional approaches specifically in the Nigerian context in the reference period, 2014 to 2018. The population of the study consists of all the quoted insurance firms as at 31st December, 2016. A sample of twenty eight (28) quoted insurance firms was selected and data were collected over the period. Inferential statistic consisting of the General Method of Moment was used for the data analysis. The results obtained reveal that board size is negative and exerts significant impact on tax aggressiveness in insurance firms in Nigeria. The study therefore recommends that the Federal government has to come up with a policy to respond to the marginalization of female on the insurance firm corporate board in Nigeria. The aim of this policy thrust should be targeted at reducing politics and biasness against women on the corporate boards of listed insurance firms.
김정윤,조희찬,( L. G. Austin1 ) 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
일반적으로 제품 생산에 활용되는 습식 볼밀 운전 조건 하에서는 굵은 입자들이 1차 분쇄 모델에 의해 예상되는 것보다 적게 배출되는 내부 분급 현상이 나타난다. 이러한 현상을 이해하기 위해서 4가지 방법의 보정 방법을 적용하여 보았다. 첫째는 밀 배출구에 가상의 분급 장치의 존재를 가정하는 것이고, 두 번째는 입도별로 다른 체류 시간을 가정하는 것이다. 셋째는 분쇄율(Specific rates of breakage) 공식을 수정하여 시간에 따라 분쇄율이 변한다고 가정하는 것이고, 넷째는 1차 분쇄 모델이 아닌 비 1차 분쇄 모델(non-first order breakage kinetics)을 도입하는 것이다. 네 가지 방식에 대해 문헌에 제시된 분쇄 실험 결과를 활용하여 적용 작업을 수행하였으며, 넷째 방법을 제외한 다른 방법들은 보정 작업이 간단한 반면 분쇄가 진행됨에 따라 각 방법들에 적용되는 변수값들의 변화폭이 크게 나타났다. 반면 넷째 방법에서는 보정 작업은 복잡하지만 변수값들의 변화가 작았다. 이는 내부 분급 현상이 비 1차 반응에 의해 주로 발생한다는 것을 의미한다고 하겠다.