Sirvi Autor "Roja, Z." järgi

Nüüd näidatakse 1 - 9 9

Faults and the physical workload in sawing and packing-related woodworking processes when considering potential ergonomic solutions
(2018) Kalkis, H.; Roja, Z.; Babris, S.
The forest sector is a high - risk economic sector in Latvia, one in which manual work, awkward postures, the tightening up of individual muscle groups, and work monotony still exists. The aim of this study was to analyse the physical workload and fault modes, and their effects on the sawing and packing proce sses in woodworking when considering potential ergonomic solutions. Results show that packing operators and saw operators alike are exposed to severe loads, and these results coincide with survey results in which employees in these professions complain abo ut the physical load and mention lower back pain. Fault modes and their effects on the sawing and packing processes were analysed using Failure Mode and Effects Analysis, and the main errors which were revealed in packing operations were related to machine ry and lifting equipment, as well as to ergonomics and errors involving the human factor. The risk priority was calculated in terms of a figure. Financial indices were compared before and after any potential improvement in the sawing and packing processes. Analysis proves that investments in the improvement of ergonomics in relation to the automation of the production process saves human resources and is economically favourable when it comes to ensuring the sustainable development of the business in questio n.
Psychosocial risks analysis for employees in public administration
(2020) Pastare, D.; Roja, Z.; Kalkis, H.; Roja, I.
Nowadays psychosocial risks at work have a serious impact not only on the health of employees, but also on the economic performance of organisations, and this is the biggest challenge in working environment. In Latvia, employees in public administration comprise 11% of the total population. Hence the aim of this study was to analyse the causes of psychosocial risks and the differences in their prevalence among inspectorate officials employed in the State Administration compared to office staff employed by the State Administration. A modified Copenhagen Psychosocial Questionnaire from the Danish National Research Centre for the Working Environment was used to assess psychosocial risks at work. One public administration organisation was selected for the study, which involved 111 staff (60 inspecting officers and 51 office staff). The analysis of the results of the psychosocial risk assessment shows that there are statistically significant differences in the assessment of four out of 11 psychosocial risks to the working environment. The most common psychosocial work environment risk factor among inspectors is the inadequate attitude of management, but the most common risk factor among office employees is the lack of impact on work. To reduce the spread of psychosocial risks more effectively, an individual approach is required for each worker.
Psychosocial risks for health care workers in rehabilitation centre
(Estonian University of Life Sciences, 2024) Kalkis, H.; Roja, Z.; Metuma, V.
Psychosocial risks at work have a strong impact on workers in every economic field, especially in health care. The aim of this study was to analyze psychosocial risk impact on workers in 3 areas of work, including doctors or functional specialists, nurses and support staff at work for healthcare employees in one of Rehabilitation centers in Latvia. The Copenhagen Psychosocial Questionnaire was used to assess psychosocial risks at work. Main results show that the high scores for work atmosphere and social support from colleagues reflect the favourable social environment in the context of employee relationships, but doctors and functional specialists face significant psychosocial risks characterized by high quantitative and emotional demands, compounded by job insecurity and inadequate managerial support. Nurses contend with high physical and emotional risks influenced by unpredictable work patterns, unclear roles, and insufficient social support, while support staff confront high workload, role conflicts, and pervasive job insecurity, minimal recognition and unsupportive workplace atmospheres. In general critical aspects include work-life balance, appreciation and self-rated health are at work. Continuation of the research will be related to investigating the psychosocial risks with cognitive tests for each research group.
Psychosocial work environment risks for museum workers in Latvia
(Estonian University of Life Sciences, 2025) Priede, I.; Roja, Z.; Kalkis, H.; Sloka, B.
In Latvia, as elsewhere in the world, psychosocial risks at work are considered to be a topical occupational risk in every sector of the economy, including the cultural sector. The aim of this study was to investigate the psychosocial risks of the working environment for museum workers in Latvia. The study involved 303 respondents from different museums in Latvia. A staff survey was conducted, and psychosocial risks at work were assessed using the short version of The Copenhagen Psychosocial Questionnaire - COPSOQ III. The survey found that 73–77% of museum employees are women, with about a quarter of respondents reporting working more than 40 hours per week. Work is often performed in a forced posture, 28.1% of respondents complain of overwork, 70.3% of respondents report an unsuitable working environment, almost half of respondents indicate that they are exposed to harmful chemicals at work, and almost all employees report low pay. The results of the COPSOQ survey show that the main reasons why the majority of respondents have chosen to work in the existing museum are: the support of colleagues, a good atmosphere, the opportunity to use knowledge and skills, as well as the meaning of work. Future research will focus on using cognitive tests to better understand the psychosocial risks faced by museum workers.
Qualimetry as productivity criteria in metal-cutting operations
(2020) Maksimov, D.; Kalkis, H.; Perevoschikov, Y.; Roja, Z.
The qualimetry method will allow an objective assessment of the performance of metal-cutting machines and the production capacity of machinery, as well as an objective assessment of their use in multi-product manufacturing, applying the qualimetry approach and qualimetry indicators, which are based on the concept of qualification of metal removing during machine operations. The aim of the study is to develop methods for measuring the performance of metal-cutting machines and open the way to create a regulatory framework based on quantitative indicators of the equipment quality. Qualimetry measured volume of metal removing allows setting the maximum possible productivity (quali-power) of metal cutting machinery, based on a small number of basic quality indicators contained in the machinery data sheets. It is essential that the quali-power of the machinery is an objective indicator of its quality, independent of the specific conditions of its operation at any given time. Hence the productivity criteria in metalworking cutting operations can be measured.
Sleep hygiene and psycho-emotional load for office employees
(Estonian University of Life Sciences, 2023) Stelle, S.; Freiberga, P.; Kalkis, H.; Roja, Z.
The development of technology and changes in the world have dramatically increased the psycho-emotional risk exposure for office employees. At the work with computer and digital devices in the offices, employees are exposed to several risk factors of the work environment and one of the most frequent complaints is psycho-emotional load caused by various issues. There is no denying that sleep is one of the basic human needs, and sleep quality is important for maintaining and preserving good health and wellbeing. Sleep hygiene includes a set of various measures, such as the regularity of waking up and going to bed, that can affect and improve the quality of sleep. Sleep quality is closely related to mental health, as poor mental health can negatively affect sleep quality and vice versa. Reduced psycho-emotional load is associated with better sleep hygiene and also good sleep hygiene is associated with reduced psycho-emotional load. Health promotion measures and a work environment that supports sleep health could reduce psycho-emotional load experienced by employees, increase work ability, productivity and reduce the risk of accidents at the workplace. The aim of this study was to investigate psycho-emotional load and sleep hygiene importance for office employees.
Use of qualimetry method in production labour estimation
(2019) Maksimov, D.; Kalkis, H.; Perevoschikov, Y.; Roja, Z.
Every work process of production organization involves employees and employer interaction with each other by “agreement”. Such agreement is contracted based on the implementation of concrete types of work processes in particular workplaces. The general the total number of workplaces are continuous interaction areas of people to transform substance, energy and information. The solution of the assigned tasks requires the methodology for designing product quality, analyzing market consumer needs, forecasting potential prices and detecting effectiveness in order to present the strategic objectives in digital values. This study is part of a larger investigation which involves principles of economic metrology and qualimetry of work. The purpose of the research is to demonstrate use of qualimetry in the production organization, based on experience of several years in many industry organisations by focusing on engineering.
Work posture load evaluation in medium size metal processing enterprise in Latvia
(2019) Kalkis, H.; Roja, Z.; Bokse, K.; Babris, S.; Roja, I.
The aim of this study was to evaluate the exposure of individual workers to ergonomic risk factors associated with upper, lower extremities and trunk WRMSDs and to assess entire body posture for risk of WRMSDs. The company that produces finished metal products (ironing boards) was chosen for the research. Rapid Entire Body Assessment (REBA) was used to assess the entire body posture for risk of WRMSDs. Rapid Upper Limb Assessment (RULA) method was used for ironing boards employees to evaluate exposure of the neck, trunk, arms and legs in relation to physical load. Our study proved that employees are subjected to WRMSDs due to the load on certain body parts during the work: shoulder and neck area, lower back, legs and arms. Forced work postures are an essential risk factor at work. Assemblers and packers are subdued to high risk level, but inspectors – to medium risk level, which corresponds to evaluation with RULA and REBA methods.
Work strain predictors in construction work
(2017) Roja, Z.; Kalkis, H.; Roja, I.; Zalkalns, J.; Sloka, B.
The aim of this study was to predict the work strain indicators for construction workers and to work out measures for prevention of strain at work. Subjective and objective research methods were utilized in the research, including survey, work intensity measurements (Borg Scale), work strain index, fatigue index and work ability index determination, objective blood pressure and pulse measurements. Statistical analysis with significance calculations was carried out. The limitation of this study is the small number of subjects involved in the research. Subjective evaluation of fatigue index and strain index resulted in moderate and somewhat hard work heaviness categories accordingly to Borg Scale. Measurements of heart rate, blood pressure approved work strain of employees of both professions does not exceed the admissible heart rate limit during physical load. The research proved that the strongest work strain predictors were connected with psycho-social risks rather than with physical ones.

Sirvi Autor "Roja, Z." järgi

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