How Does Variability in Cash Flows and Returns Influence How Top Executives Are Paid?

I invoke agency theory to evaluate how top executives’ compensation contracts are structured, conditional on risk in the firm’s operating environment, focusing on the total, fixed, and variable components. The results suggest that companies exert some effort to adhere to agency theoretic principles in designing top executive compensation contracts. However, imperfections in the pay setting process mean that there is ample room for powerful CEOs to seek rents. Furthermore, when risk in the operating environment is measured with volatility in returns, non-CEO top executives sometimes bear greater risk than CEOs, collecting a greater percentage of their compensation in variable pay than most CEOs. The results are most distinct in the extreme deciles of volatility, suggesting that firms may be paying greater attention to compensation design in the most extreme settings of volatility. I offer potential explanations for this phenomenon

Copilot Security: A User Study

Code generation tools driven by artificial intelligence have recently become more popular due to advancements in deep learning and natural language processing that have increased their capabilities. The proliferation of these tools may be a double-edged sword because while they can increase developer productivity by making it easier to write code, research has shown that they can also generate insecure code. In this paper, we perform a user-centered evaluation GitHub's Copilot to better understand its strengths and weaknesses with respect to code security. We conduct a user study where participants solve programming problems, which have potentially vulnerable solutions, with and without Copilot assistance. The main goal of the user study is to determine how the use of Copilot affects participants' security performance. In our set of participants (n=25), we find that access to Copilot accompanies a more secure solution when tackling harder problems. For the easier problem, we observe no effect of Copilot access on the security of solutions. We also observe no disproportionate impact of Copilot use on particular kinds of vulnerabilities

Is GitHub's Copilot as Bad as Humans at Introducing Vulnerabilities in Code?

Several advances in deep learning have been successfully applied to the software development process. Of recent interest is the use of neural language models to build tools, such as Copilot, that assist in writing code. In this paper we perform a comparative empirical analysis of Copilot-generated code from a security perspective. The aim of this study is to determine if Copilot is as bad as human developers - we investigate whether Copilot is just as likely to introduce the same software vulnerabilities that human developers did. Using a dataset of C/C++ vulnerabilities, we prompt Copilot to generate suggestions in scenarios that previously led to the introduction of vulnerabilities by human developers. The suggestions are inspected and categorized in a 2-stage process based on whether the original vulnerability or the fix is reintroduced. We find that Copilot replicates the original vulnerable code ~33% of the time while replicating the fixed code at a ~25% rate. However this behavior is not consistent: Copilot is more susceptible to introducing some types of vulnerability than others and is more likely to generate vulnerable code in response to prompts that correspond to older vulnerabilities than newer ones. Overall, given that in a substantial proportion of instances Copilot did not generate code with the same vulnerabilities that human developers had introduced previously, we conclude that Copilot is not as bad as human developers at introducing vulnerabilities in code

Human Factor Analysis Framework for Ghana’s Mining Industry

In an attempt to incorporate human factors into technical failures as accident causal factors, researchers have promoted the concept of human factor analysis. Human factor analysis models seek to identify latent conditions within the system that influence the operator’s action to trigger an accident.  For an effective application of human factor analysis models, a domain-specific model is recommended. Most existing models are developed with category/subcategory peculiar to a particular domain. This presents challenges and hinders effective application outside the domain developed for. This paper sought to propose a human factor analysis framework for Ghana’s mining industry. A comparative study was carried out between three dominated accident causation models and investigation methods in literature; AcciMap, HFACS, and STAMP. The comparative assessment showed that HFACS is suitable for incident data analysis based on the following reason; ease of learning and use, suitability for multiple incident analysis and statistical quantification of trends and patterns, and high inter and intra-coder reliability. A thorough study was done on HFACS and its derivative. Based on recommendations and research findings on HFACS from literature, Human Factor Analysis, and Classification System – Ghana Mining Industry (HFACS-GMI) was proposed. The HFACS-GMI has 4 tiers, namely; External influence/factor, Organisational factor, Local Workplace/Individual Condition and, Unsafe Act. A partial list of causal factors under each tier was generated to serve as a guide during incident coding and investigation. The HFACS-GMI consists of 18 subcategories and these have been discussed. The HFACS-GMI is specific to the Ghanaian Mines and could potentially help in identifying causal and contributing factors of an accident during an incident investigation and data analysis.   Keywords: Human Factor Analysis, Causal Factor, Causation Model, Mining Industr

Evaluation of Groundwater Suitability for Irrigation in the Lambussie-Karni District of Ghana

The populace of the Lambussie-Karni District are mainly farmers who have resorted to the use of groundwater for irrigation during the dry season because of long drought and inadequate surface water bodies. The temporal variation of the groundwater quality for irrigation in the District was assessed using sixteen boreholes. Richard Plot indicates that groundwater in the study area is within the low salinity to low sodium hazard and medium salinity to low sodium hazard class. Wilcox Plot shows groundwater to be within excellent to good class in the catchment. Irrigation water quality index (IWQI) map was also developed to determine precisely the degree and areal extent of groundwater suitability for irrigation. ArcGIS 10.1 was used to generate thematic maps for sodium adsorption ratio (SAR), residual sodium carbonate (RSC), permeability index (PI), sodium percentage (Na %), HCO3-, pH and electrical conductivity. The results were compared to Food and Agricultural Organisations (FAO) standard guidelines. An IQWI map for the Lambussie- Karni District shows that groundwater is generally suitable for irrigation, about 24.57 % of the district will require crops which can tolerate high amount of salts. A percentage (39.82 %) of the catchment has groundwater, which is highly suitable for crops which are least resistant to salt. Keywords: Groundwater Suitability; Irrigation Water Quality; SAR; IWQI Map; Lambussie-Karni Distric

Livelihood and the risk of HIV/AIDS infection in Ghana: the case of female itinerant traders

Itinerant trading is the second major economic activity for women who constitute an important chain in the distribution of goods in West Africa. Historically they have played important roles in the political economy of Ghana. With the outbreak of AIDS these women, some of whom move far away from home sometimes for days or even weeks, stand the risk of being infected with HIV through their activities. Using a combination of methods including a survey, focus-group discussions and conversations with key informants, we examine how the trade is organized, the characteristics of the traders, and the risk factors that are likely to predispose them to contracting the AIDS virus. Itinerant women traders appear highly vulnerable, as women and as highly mobile people. This state of affairs, occasioned by the extremely difficult conditions in which the women work, is exploited for the sexual gratification of the men with whom they come into contact. The attempt to reduce the spread of AIDs through education has to target itinerant women traders at the points of transaction

Chemical Analysis of Freshwater Bodies in the Kumasi Metropolis and Its Environs, Ghana

One of the main environmental problems facing the city of Kumasi the second largest city in Ghana over the years has been the pollution of water bodies arising from anthropogenic activities. This has become a potential health threat to the inhabitants of the city which was formerly referred to as the garden city of Ghana and its environs. The most affected are the surrounding rural areas that rely solely on the rivers for drinking, domestic and agricultural purposes. This study focused on the extent of chemical pollution of these water bodies through the determination physicochemical parameters such as pH, temperature, conductivity, total dissolved solids (TDS), Total suspended solids (TSS), alkalinity, Total hardness, nitrates, sulphates as well as heavy metals and biological contamination through the determination of total coliform and Escherichia coli. Eight samples were taken from three main rivers in the Kumasi metropolis namely Wiwi, Sisa and Subin. This data showed variations in the parameters in the samples as follows: pH, 6.67-7.50; temperature, 28-29°C; electrical conductivity (EC), 220-2120 mS/cm; TDS,10-1800 mg/l; alkalinity, 24-124 mg/l; total hardness, 25-365 mg/l; nitrates, b/d-0.47 mg/l; sulphate,0.352-40.30 ; phosphates, 5.2-30 mg/l; Pb, 6.620-6.797 mg/l; Fe. 14.81-45.65 mg/l; Mn, 0.726-4.7427 mg/l; Cd, 0.156-0.219 mg/l; Cr, 0.03-0.10 mg/l; Ni, 0.002-0.018 mg/l; Cu 0.113-2.258 mg/l and Zn 0.368-5.255 mg/l.  However, all the results obtained for the levels of the metals exceeded the EPA Maximum contaminant level (MCL) with the exception of the zinc where only one of the samples exceeded the MCL level. Keyword: environmental, chemical pollution, Maximum contaminant level, physicochemical parameters, Kumasi-Ghan

First One Hundred Days of Oil Production in Ghana

This paper discusses the events and happenings in Ghana within the first onehundred days of oil production. Using elite interviews and media reports, thepaper chronicles several challenges and problems including lack oftransparency, secrecy, consensus building, discontentment, etc that haveoccurred in the oil industry. Given that these were the same challenges thatcharacterized the preparatory processes prior to oil production, the paperargues that the challenges and problems of the oil industry within the firsthundred days of oil production are not mere teething problems but signs ofgreater challenges to come. The paper concludes on the note that timeousand prompt solution to these challenges is crucial in ensuring that the oilbecomes a blessing to the nation in so far as development and promotion ofgood governance and democracy are concerne

Effect of Cleopatra mandarin rootstock age on bud ‘take’ of Late Valencia sweet orange

Cleopatra mandarin is preferred to rough lemon as rootstock material for budding because of the susceptibility of the latter to major citrus diseases such as gummosis and phytophtora infections. However, Cleopatra mandarin rootstocks have poor bud ‘take’. The experiment was conducted at CSIR-Plant Genetic Resources Research Institute, Bunso to determine the effect of Cleopatra mandarin rootstock age on bud ‘take’ of Late Valencia sweet orange variety. Cleopatra mandarin rootstocks of ages 9 months, 10 months, 11 months and 12 months were budded with Late Valencia sweet orange variety using the chip budding technique in a randomised complete block design. There were 25 budded seedlings for each age group and replicated four times. Results obtained indicated that younger Cleopatra mandarin rootstock favoured bud ‘take’more than older ones. Higher bud ‘take’ was recorded in the 9-month old rootstocks followed by the 10-month old ones. Bud ‘take’, however, decreased with age of the rootstock. Differences in bud ‘take’between younger rootstocks (9 and 10 months old) were insignificant. There were, however, significant differences between bud‘take’ of younger rootstocks and older rootstocks (11 and 12 months old)

Seasonal Variation in Heavy Metal Content of Lake and Underground Water in Some Selected Towns around the Bosomtwe Crater Lake

The levels of Arsenic, Iron, Lead, Zinc, Chromium, Cadmium and Nickel in water samples from Lake Bosomtwe and Bore Holes in some towns around the Lake have been determined using Atomic Absorption Spectrophotometer (Varian AAS 220). The levels of Arsenic, Cadmium and Nickel were generally small and were below the detection limit of the instrument. The results showed seasonal variations in the mean levels of Pb, Fe, Zn and Cr in water from the Bosomtwe Crater Lake. There were significant correlations between the mean levels of Fe and Pb in the underground water in the two seasons whilst Zn and Cr showed weak correlation in underground water for the wet and dry seasons. The levels of the metals in the bore holes were generally below the WHO standard values compared to the levels of the metals in the water samples from the lake. The mean pH values for water samples from the bore holes in the towns around the Bosomtwe Crater Lake were within the WHO standard of 6.50-8.50. Keywords: Lake Bosomtwe, Borehole, Crater, Heavy metals, Atomic Absorption Spectrophotometer