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Joseph Kwaku Ahialey,Ho-Jung Kang 한국무역학회 2019 Journal of Korea trade Vol.23 No.6
Purpose - First, this study contextually examines the governance codes of South Africa and South Korea. Second, it analyzes board features of South African (JSE) Mainboard and South Korean (KRX) KOSPI-listed companies. Design/methodology - This review is qualitative and uses data from the annual reports of the selected markets’ companies, respective exchanges’ official web sites and corporate governance-related web sites in order to examine the corporate governance practices in the two markets. In addition, Nvivo is employed in analyzing the content of the corporate governance codes of the selected countries. Findings - Our analysis indicates that the corporate governance codes of the two countries are evolving to keep up with the international trend of principles-based approach. The composition of the board of directors (BODs) of non-financial companies of both South Africa and South Korea shows no significant variation between the companies with regards to the executive (inside) and nonexecutive (outside) directors. On the contrary, there is a significant variation between South African and South Korean listed companies with respect to diversity. Originality/value - While previous studies are centered on the impact of governance codes on performance, this study intends to contextually evaluate the codes and features of South Africa and South Korea listed companies. This is essential and timely for regulators and policy makers given the importance of corporate governance features such as board independence and diversity in recent times.
A Multi-winding Transformer Model for Predictive SMPS Design and Analysis
Philip Kwaku Fosu Okyere 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper outlines the applicability of a multi-winding transformer model for the predictive analysis and design of switched-mode power supplies (SMPSs). The transformer model is PSPICE-compatible and its parameters are obtained from the physical dimensions and material properties of the transformer. Skin and proximity effects in the conducting layers, as well as transformer parasitic capacitances and non-linear core properties, are considered. The model has proven very useful for the predictive design and analysis of SMPS transformers, especially those of forward-converters and enables the prediction of conducted EMI in SMPSs at an early design stage, even before the construction of the first prototypes.
The Weekend and January Effect in the Ghana Stock Market
Joseph Kwaku Ahialey(조셉),Ho-Jung Kang(강호정) 한국콘텐츠학회 2015 한국콘텐츠학회논문지 Vol.15 No.8
본 연구의 목적은 가나증권거래소 종합지수를 바탕으로 가나 증권 시장에서 주말 효과 및 1월 효과가 나타나고 있는지를 분석하고자 하는 것이다. 이를 위해 가나 증권시장에 상장된 기업을 대상으로 2005년 1월 4 일부터 2013년 12월 31일까지 9년간의 일별종가와 종합지수를 나타내는 ASI 및 CI를 토대로 회귀분석을 이용하여 두 효과를 검증하였다. 회귀분석 결과에 따르면 가나 증권 시장에서는 주말효과가 나타나지 않아 선행 연구 결과와 다르게 나타났으며 이는 연구기간과 연구 자료가 다르기 때문인 것으로 사료된다. 월간효과의 회귀 분석 결과, ASI가 사용된 2005년부터 2010년까지 6년의 기간 전체를 대상으로 분석한 결과 4월 효과가 나타났으며, ASI가 사용된 기간을 3년을 기준으로 두 개의 기간으로 구분하여 분석한 결과 2005년부터 2007년까지의 기간은 4월 효과가 보이지 않지만 2008년부터 2010년까지 기간의 경우에는 4월 효과가 나타났다. CI가 사용된 2011년부터 2013년까지 기간의 경우에는 1월 효과가 존재하는 것으로 나타났다. The aim of this study is to analyze the Weekend and January effect in the Ghana Stock Exchange (GSE) using daily closing prices of GSE-All Share Index (ASI) and Composite Index (CI) between the period of January 4th, 2005 and December 31st, 2013. The dataset covers the period of 2005 to 2010 (6 years) for the ASI and 2011 to 2013 (3 years) for the CI. The following results are obtained based on a parametric regression using dummy variables. First, no weekly effect or anomaly is documented for both GSE-ASI and GSE-CI. Second, market abnormalities are captured for both GSE-ASI and GSE-CI over their respective entire periods. However, no consistent April effect is found for ASI when the period was segregated into two periods of three years. The April effect is uncovered for the GSE-ASI at 5% significant level while the January effect is found for the GSE-CI at 1% significant level.
Performance Evaluation of Multi-Objective Heat Pump System
Selorm Kwaku Anka,Kwesi Mensah,Boafo Nicholas Lamptey,Samuel Boahen,Kwang Ho Lee,Jong Min Choi 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
This paper experimentally analyzed the performance of a water-to-water multifunctional heat pump with the variation of heat source, heat sink temperatures. The heat pump is designed with a single stage cycle for heating or cooling only, and a two stage cycle comprising of low stage and high stage cycles for hot water production. In single stage cycle cooling and heating modes, COP increased by 11.4% and 20℃ as ID EWT and OD EWT increased by 15℃ respectively. In two-stage multi-objective modes, COP increased by 27.4% respectively as OD EWT increased by 15℃.