Dynamics of Inventory Cost Optimization – A Review of Theory and Evidence

The inventory control models as an estimation tool for optimizing inventory cost and management of inventory is discussed in this paper. Various methods of estimating the Economic Order Quantity (EOQ), Safety Stocks under deterministic and stochastic situations are reviewed. Traditional methods of managing inventory such as accounting ratios analysis, two bin systems, perpetual inventory system and some others form part of this paper. Ratings of inventory or its classification in order of priority by unit and consumption value are also reviewed in the paper. Empirical evidence reviewed in this work tends to support the opinion that modern method of inventory control is far more effective and efficient than the traditional methods of control. Keywords: Inventory Control Models, Inventory Ratios, Economic Order Quantity

The effects of etonorgestrel implant (ImplanonR) on the lipid profile of Nigerian women

Background: Provision of contraceptive methods with minimal side effects will enhance uptake of contraception particularly in Nigeria where contraceptive prevalence rate remains low. The safety profile of ImplanonR, a long‑acting hormonal subdermal contraceptive containing etonogestrel, has not been adequately evaluated among Nigerian women.Objective: To assess the effects of etonogestrel subdermal implant (ImplanonR) on lipid profile among Nigerian women.Materials and Methods: The study was a longitudinal follow‑up of 54 consenting women selected over a 6‑month period at the Family Planning Clinic of the University College Hospital, Ibadan. After ImplanonR insertion, each woman was followed‑up monthly for a period of 12 months. Fasting venous blood samples were collected for quantification of serum lipids prior to insertion of the implant, then at 1st, 3rd, 6th, 9th, and 12th months of follow‑up.Results: The mean age of the women was 34.4 ± 5.6 with a range of 22–47 years. The modal number of children was 2 ranging from 1 to 6. Total cholesterol (TC) levels showed a general tendency toward a rise. The rise was, however, only significant in the 3rd and 12th months of use. Serum triglycerides showed a tendency toward reduced levels, which were only significant at the 6th and 9th months of use. High‑density lipoprotein (HDL) levels were consistently and significantly elevated above baseline levels. Beyond the 3rd month, low‑density lipoprotein (LDL) levels were lower but not significantly compared with baseline levels. HDL/TC and HDL/LDL ratios were consistently and significantly elevated in comparison with baseline values.Conclusion: Etonogestrel implant seems to cause significant effects on the lipid profile of Nigerian women. The increases were mainly in the HDL fraction, which suggests that the atherogenic and cardiovascular disease risks are reduced. We recommend larger studies to confirm our findings.Keywords: Implanon; laevonorgestrel; subdermal implan

Dealing with impact of COVID-19 on transportation in a developing country: Insights and policy recommendations

While developed nations have established policy frameworks for dealing with various macroeconomic shocks, developing countries respond to the influx of COVID-19 on heterogeneous scales, borne out of varying institutional bottlenecks. These inadequate transport facilities are not diversified enough to deal with an impending public health crisis. With the growing divergence in public transport management procedures and societal responses and willingness to adjust to a "new normal" transport procedures in time of COVID-19 and postpandemic, it becomes expedient to learn evidence-based policy responses to transport service delivery. Qualitative data from semi-structured interviews with commuters and operators were thematically analysed to understand the impact of COVID-19 on transportation in Lagos Nigeria. The analysis revealed that increased cost of transportation, financial sustainability, changes in travel needs and loss of revenue were the significant impacts of the pandemic. This study contributes such that transport stakeholders can better understand how to navigate their transportation needs at this time of global uncertainty. The understanding of these impacts advances policy recommendations that are most inclined to the development objectives of developing nations in the time of COVID-19 and beyond. The limitations and suggestions for further research were discussed

Development of an Indigenously Made Diesel Fired Crucible Furnace

Most castings in Nigeria are imported, the poor performance of the manufacturing sector in Nigeria is indicative of the low state of the foundry industry of which majority are small–medium scale enterprises with an unsubstantial total productive cost and input to the upper limit of only between 5-20 million naira. This is quite very low compared to that in the US; put the market value of the annual casting shipments at 28-30 billion US dollars produced by approximately 3,200 foundries has been reported. These myriad of problems therefore, necessitated this research workThe technological advancement of any nation have been influenced and uplifted by the extent to which it can usefully harness and convert its mineral resources. The productions of metal in foundries and in all human lives have become a general practice. This work deals with the design, fabrication and performance evaluation of a diesel-fired crucible furnace suitable for use both in the rural and urban areas for casting of different types of metals using indigenously sourced materials and technology. The components of furnace were furnace casing, crucible, furnace cover, burner housing, furnace cover stand, base stand and burner. Mild steel sheet was used for the fabrication of the furnace, while the other components needed for the design were selected based on functionality, durability, cost and local availability. Experimental tests were performed to evaluate the performance of the furnace. The average heating rate of 19.54°C/min was recorded by the furnace and attained a temperature as high as 1420 °C. The furnace also had a melting rate of 454.55g/min for Aluminium. The thermal efficiency of the furnace was determined to be 10.80%. The low value was as result of the large energy wastage due to the type of insulator used in making the furnace wall. The furnace is environmental friendly without health hazards to the workers and can be moved from one place to another unlike the local one.Self-sponsore

A Shoveling-related Pain Intensity Prediction Expert System for Workers’ Manual Movement of Material

In this study, a fuzzy-based expert system called the Pain Intensity Prediction Expert System (PIPES) was developed to predict pain severity risk (PSR) in shoveling-related tasks. The primary objective was to develop a non-changing rating risk assessment ergonomics tool that both efficient and comparable with those obtained from human ergonomics experts in the field of application. PIPES used fuzzy set theory (FST) to make decisions about the level of pain associated with a selected worker base on the measured task variables, namely scooping rate, scooping time, shovel load, and throw distance as input and PSR as the result. Values obtained from variable measurements from a sand shoveling task were run with PIPES, and the results were compared with the workers’ self-reported pain (WSRP) intensity using a numeric rating scale (NRS) tool. The result of validation showed that there was a strong positive relationship between WSRP NRS and PIPES NRS, with a correlation coefficient of 0.70. The independent sample t-test for mean difference showed that WSRP had a statistically significantly lower level of NRS (4.35 ± 2.1) compared to PIPES (4.75 ± 2.2), t (38) = - 0.591, p = 0.558. With a significance level of 0.001 at 95% confidence, the groups’ means were not significantly different. The study developed an expert system, PIPES, which can be used as a computerized representation of ergonomics experts, who are scarce. PIPES can be applied to construction industries, sand mine locations, and any workplace where materials are manually moved using a shovel

Early sexual debut: prevalence and risk factors among secondary school students in Ido-ekiti, Ekiti state, South-West Nigeria

Background: Early adolescent sexual activity remains a recurring problem with negative psychosocial and health outcomes. The age at sexual debut varies from place to place and among different individuals and is associated with varying factors. The aim was to determine the prevalence and risk factors of early sexual debut among secondary school students in Ido-Ekiti, South-West Nigeria.Methodology: This was a cross-sectional study. The respondents were selected using multi-stage sampling technique. Pre-tested, semi-structured, self-administered questionnaire was used to collect data. Data was analyzed using SPSS version 15.Results: More than two-thirds, 40(67.8%), had early sexual debut. The prevalence of early sexual debut was about 11%. The mean age of sexual debut was 13.10±2.82; the mean age for early sexual debutants was 11.68±1.98. The mean number of sexual partners was 2.44±1.99. Male gender, having friends who engaged in sexual activities had association with early sexual exposure (p<0.05). Alcohol intake had the strongest strength of association for early sexual debut among the students.Conclusion: The high prevalence of early sexual exposure among the students calls for urgent interventions to stem the trend. This will help to reduce the devastating negative psycho-social and health sequels.Keywords: Sexual debut, prevalence, risk factors, Nigeri

Early sexual debut: prevalence and risk factors among secondary school students in Ido-ekiti, Ekiti state, South-West Nigeria.

Background: Early adolescent sexual activity remains a recurring problem with negative psychosocial and health outcomes. The age at sexual debut varies from place to place and among different individuals and is associated with varying factors. The aim was to determine the prevalence and risk factors of early sexual debut among secondary school students in Ido-Ekiti, South-West Nigeria. Methodology: This was a cross-sectional study. The respondents were selected using multi-stage sampling technique. Pre-tested, semi-structured, self-administered questionnaire was used to collect data. Data was analyzed using SPSS version 15. Results: More than two-thirds, 40(67.8%), had early sexual debut. The prevalence of early sexual debut was about 11%. The mean age of sexual debut was 13.10\ub12.82; the mean age for early sexual debutants was 11.68\ub11.98. The mean number of sexual partners was 2.44\ub11.99. Male gender, having friends who engaged in sexual activities had association with early sexual exposure (p<0.05). Alcohol intake had the strongest strength of association for early sexual debut among the students. Conclusion: The high prevalence of early sexual exposure among the students calls for urgent interventions to stem the trend. This will help to reduce the devastating negative psycho-social and health sequels

Risky sexual behavior and associated factors among sexually-active unmarried young female internal migrants working in Burayu Town, Ethiopia.

BackgroundYoung female internal migrants are highly vulnerable to risky sexual behaviors (RSB) which may result in serious health problems such as unintended pregnancy, abortion and sexually transmitted infections including HIV. RSB includes early sexual debut (before 18 years), having multiple sexual partners, sex without a condom or inconsistent use of condom and sex under the influence of substance use. This study aimed to assess the magnitude and the factors associated with RSB among sexually-active unmarried young female internal migrants in Burayu Town, Ethiopia.MethodsA cross sectional study design was used for the study. A total of 267 respondents was recruited into the study using a simple random sampling technique. A semi-structured interviews-administered questionnaire was used to obtain information from the study participants. The collected data were cleaned, coded and entered into Epi data version 3.1 and then exported to SPSS Ver.21 for analysis. Multiple logistic regression models were used to indicate the association between dependent and independent variables.The resultsAbout 35% of the young female internal migrants had sexual debut before the age of 18 years; 64.4% had sex without condom or inconsistently used condom; nearly one quarter of the participants had multiple sexual partners, and 29.6% had sex under the influence of substance uses. The magnitude of RSB among the study participants was (79.1%). Sexting [AOR 3.47(95%; CI;1.10-11.94)], frequent engagement in social media [AOR 10.9(95%;CI;2.31-51.89)], feeling of embarrassment to buy condom [AOR 8.28(95%; CI; 2.10-32.62)], unfavorable attitude toward using condom for steady and loving relationship [AOR 5.72(95%; CI; 1.47-22.24)] were related with RSB while self-efficacy [AOR 0.15(95%: CI; 0.04-0.57)] to use condom and perceived risks of getting pregnant [AOR 0.05(95%; CI; 0.01-0.23)] were found to be protective factors.ConclusionThe study found high levels of RSB among sexually-active unmarried young female internal migrants. This finding suggests an urgent need of intervention to promote safe sex among this group. Special attention and prompt interventions are needed to promote the use of condoms

"I was raped by the broker on the first day of my arrival in the town." Exploring reasons for risky sexual behavior among sexually-active unmarried young female internal migrants in Ethiopia: A qualitative study.

BackgroundStudies revealed that internal migrants are one of the most vulnerable groups for poor sexual and reproductive health (SRH) information and services. Risky sexual behavior (RSB) is a threat to public health and might lead to serious health problems such as unintended pregnancy, abortion, and sexually transmitted infections (STIs) including HIV/AIDS. The reported prevalence of RSB among young female internal migrants in Ethiopia was as high as 70.3%. This requires in-depth understanding of the underlying cause. So, this study aimed at exploring reasons for RSB among sexually-active unmarried young female migrants in Ethiopia.MethodsA descriptive qualitative study was conducted using focus group discussions among sexually-active young female migrants working Burayu town. The focus group discussions were done in the local languages of participants (Afaan Oromo and Amharic). The recorded data were transcribed verbatim and translated into English for analysis and presentation in the study. The data were coded and Atlas.ti 7.5 software packages were used for data analyses. Then, the findings were thematically organized and analyzed using content analysis.ResultsThis study revealed that poor socio-economic status, social media indulgence, rape, substance use, poor knowledge of condom use, unfavorable attitude toward condom use, misconceptions about emergency pills, and the nature of the new environment and work place were responsible for RSB among internal migrants. The participants described that the migrants' economic conditions and workplace sexual violence are pushing them toward engaging in unprotected sex, being sexually abused, commercial sex, and transactional sex.ConclusionsInternal migrants' sexual behavior is a complex process influenced by multiple interrelating systems. We have explored a set of factors namely poverty, pressure and sexual abuse from brokers, sexual exploitation and abuses against domestic workers by their bosses, indulgence in social media, sexting, inadequate knowledge, and unfavorable attitude toward condom use that led young female internal migrants to risky sexual practices. An intervention to promote safe sex targeted to this population is urgently needed with a focus on an intervention to eliminate misconceptions about condoms, increase proper condom use, and end sexual violence. Moreover, a relevant policy is needed to safeguard internal migrants from sexual exploitation and abuses at their work place