scholarly journals ANALISIS BEBAN KERJA MENTAL DAN FISIK OPERATOR HD KOMATSU 785-7 (STUDI KASUS: PT.SIMS JAYA KALTIM

ARIKA ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 37-50
Author(s):  
Hotma Kristian Silalahi ◽  
Lina Dianati Fathimahhayati ◽  
Willy Tambunan
Keyword(s):  
Task Load ◽  
Pulse Oxymeter ◽  
Nasa Task Load Index

Sims Jaya Kaltim merupakan salah satu perusahaan terkemuka dibidang kontraktor penyedia jasa pertambangan yang berfokus pada pengangkutan material Overburden (OB). Operator HD Komatsu 785-7 bertugas untuk mengangkut material dari disposal menuju ke dumpingan. Pengukuran beban kerja fisik menggunakan metode pengukuran %CVL (cardiovasculair load) selama 6 hari dengan pengukuran denyut jantung pada saat bekerja dan istirahat menggunakan alat pulse oxymeter lalu dihitung menggunakan rumus %CVL. Pengukuran beban kerja mental menggunakan metode NASA-Task Load Index dengan membagikan kuesioner kepada 30 operator HD Komatsu 785-7. Pengukuran dilakukan selama 6 hari kerja. Pengukuran dibagi menjadi 3 regu, satu regu terdiri dari 10 operator. Berdasarkan hasil pengukuran yang telah dilakukan didapatkan nilai rata-rata %CVL dengan rata-rata keseluruhan 17,00% yang berarti operator tidak mengalami kelelahan fisik karena <30% termasuk dalam kategori ringan. Hasil beban dengan rata-rata keseseluruhan sebesar 66,60 yang termasuk dalam golongan perkrjaan tinggi (61-80) yang berarti memerlukan perhatian khusus. Rekomendasi Usulan perbaikan yang diberikan kegiatan random fatique, kontroling pengisian KKH, kontroling jalan, dan kontroling debu.

scholarly journals Desktop lighting for comfortable use of a computer screen

Work ◽  
2021 ◽  
Vol 68 (s1) ◽  
pp. S209-S221
Author(s):  
Lu Han ◽  
Hechen Zhang ◽  
Zhongxia Xiang ◽  
Jinze Shang ◽  
Shabila Anjani ◽  
...  
Keyword(s):  
High Intensity ◽  
Motion Tracking ◽  
Tracking System ◽  
Computer User ◽  
Eye Tracker ◽  
Computer Screen ◽  
Task Load ◽  
Trunk Movements ◽  
Motion Tracking System ◽  
Nasa Task Load Index

BACKGROUND: The contrast between a bright computer screen and a dark ambient environment may influence comfort of the users, especially on their eyes. OBJECTIVE: The objective of this research is to identify the optimal desktop lighting for the comfortable use of the computer screen in a dark environment. METHODS: An experiment was designed where seven illumination setups were introduced for the users to perform their leisure tasks on a computer screen. Fifteen healthy subjects participated in the experiments. During each session, durations of the eye blinks, fixations and saccades of the user were recorded by an eye tracker. His/her neck and trunk movements were recorded by a motion tracking system as well. The comfort/discomfort questionnaire, localized postural discomfort questionnaire, NASA task load index and computer user questionnaire were used to record the overall comfort/discomfort, the local perceived physical discomfort, the cognitive workload, and general/eye health problems, respectively. RESULTS: Subjective and objective measurement results indicated that users felt more comfortable with high intensity warm lights using a computer screen. We also identified that the eye fixation durations, as well as the scores of two questions in the computer user questionnaire, have significant negative correlations with comfort. On the other side, the durations of blinks and the scores of three questions in the computer user questionnaire, were significantly correlated with discomfort. CONCLUSION: The warm (3000K) and high intensity (1500 lux) light reduced the visual and cognitive fatigue of the user and therefore improve the comfort of the user during the use of a computer screen.

Neural Correspondence to Human Cognition from Analysis to Intuition – Implications of Display Design for Cognition

2017 ◽  
Vol 61 (1) ◽  
pp. 51-55 ◽  
Author(s):  
Joseph K. Nuamah ◽  
Younho Seong
Keyword(s):  
Objective Measure ◽  
Mental Effort ◽  
Human Cognition ◽  
Behavioral Measures ◽  
Display Design ◽  
Percent Correct ◽  
Task Load ◽  
Frontal Midline Theta ◽  
General Difference ◽  
Nasa Task Load Index

Psychophysiological measures can be used to determine whether a particular display produces a general difference in brain function. Such information might be valuable in efforts to improve usability in display design. In this preliminary study, we aimed to use the electroencephalography (EEG) task load index (TLI), given by the ratio of mean frontal midline theta energy to mean parietal alpha energy, to provide insight into the mental effort required by participants performing intuition-inducing and analysis-inducing tasks. We employed behavioral measures (reaction time and percent correct), and a subjective measure (NASA-Task Load Index) to validate the objective measure (TLI). The results we obtained were consistent with our hypothesis that mental effort required for analysis-inducing tasks would be different from that required for intuition-inducing tasks. Although our sample size was small, we were able to obtain a significant positive correlation between NASA-Task Load Index and TLI.

Verbal Cues and Attentional Focus: A Simulated Target-Shooting Experiment

2017 ◽  
Vol 5 (1) ◽  
pp. 148-159 ◽  
Author(s):  
Louisa D. Raisbeck ◽  
Jed A. Diekfuss
Keyword(s):  
Attentional Focus ◽  
Focus Of Attention ◽  
Verbal Cues ◽  
Task Load ◽  
External Focus ◽  
Gun Barrel ◽  
Internal Focus ◽  
And Performance ◽  
Nasa Task Load Index ◽  
Learning And Performance

Performance benefits exist for an external focus of attention compared with an internal focus of attention for performance and learning (Wulf, 2013). It is unknown, however, if varying the number of verbal cues affects learning and performance. Focus of attention and the number of verbal cues were manipulated during a simulated handgun-shooting task. For the internal focus conditions, participants were told to focus on their hand, arm, and wrist, whereas the external focus instructions were to focus on the gun, gun barrel, and gun stock. To manipulate the number of verbal cues, participants received instruction to focus on a single verbal cue or multiple verbal cues. Shooting performance was assessed at baseline, acquisition, and at two separate retention phases (immediate, delayed) that included transfer tests. Participants completed the NASA—Task Load Index to assess workload following all trials. Participants who received one verbal cue performed significantly better during immediate retention than those who received three verbal cues. Participants who used external focus of attention instructions had higher performance and reported less workload at delayed retention compared to those who used internal focus instructions. This research provides further support for the benefits of an external focus and highlights the importance of minimizing the number of verbal cues.

scholarly journals Design and evaluation of UAV ground control station by considering human factors standards and guidelines

2021 ◽  
Author(s):  
Taiwo Amida
Keyword(s):  
Human Factors ◽  
Human Error ◽  
Ground Control ◽  
Task Load ◽  
Ground Control Station ◽  
Programming Techniques ◽  
Aerial Vehicle ◽  
Standards And Guidelines ◽  
Commercial Off The Shelf ◽  
Nasa Task Load Index

The majority of Unmanned Aerial Vehicle (UAV) accidents can be directly related to human error. For this reason, standards and guidelines focusing on human factors have been published by various organizations such as Transport Canada, FAA, EASA, NASA and military agencies. The objective of this thesis is to present a methodology for designing a Ground Control Station (GCS) using available standards and guidelines for human factors. During the design process, a detailed analysis was performed using human factors methods to ensure all requirements were met; each phase of the design follows the guidelines presented in the compiled human factors standards and guidelines. The GCS interface was developed using advanced programming techniques and commercial off-the-shelf software. Moreover, an operator workload evaluation was carried out using NASA task load index for validation of design methodology. It was found that the applied methodology not only improved the pilot workload, but also ensured that all user and stakeholders’ requirements are met.

scholarly journals 3D visualization in otosurgery

2020 ◽  
Vol 19 (6) ◽  
pp. 38-49
Author(s):  
D. M. Kuz’min ◽  
◽  
A. A. Fedotova ◽  
Keyword(s):  
Middle Ear ◽  
3D Visualization ◽  
Research Work ◽  
Three Dimensional ◽  
Middle Ear Surgery ◽  
Ear Surgery ◽  
Task Load ◽  
Additional Information ◽  
Surgical Field ◽  
Nasa Task Load Index

The main priority of middle ear surgery is to create a safe and optimal view of the surgical field, as well as the most accurate visualization of anatomical structures, which is a driving factor in the evolution of otosurgery. The additional information provided by three-dimensional (3D) images has been proven to improve understanding of the temporal bone anatomy and improve the operator’s ability to assess associated diseases, thereby optimizing surgical management. In the presented experimental research work, a new technique for visualizing the surgical field is described, which improves the quality of the operator’s work and expands the possibilities of middle ear surgery. On the basis of the Chair of Otorhinolaryngology of the Mechnikov North-Western State Medical University a remote adapter for an endoscopic tube was created, which allows you to broadcast the video image received from its distal end to virtual reality glasses. For a detailed understanding of the principle of information transmission in a new three-dimensional reality, we used concepts such as disparity and stereopsis. All research results were evaluated according to the NASA Task Load Index scale. Analyzing the results of the experiment, in the conditions of three-dimensional visualization of the surgical field, a lower level of subjective workload was revealed, which was regarded as a positive effect of the realization of the phenomenon of stereopsis, when performing manipulations on the middle ear.

scholarly journals The Michelangelo Effect: Art Improves the Performance in a Virtual Reality Task Developed for Upper Limb Neurorehabilitation

2021 ◽  
Vol 11 ◽  
Author(s):  
Marco Iosa ◽  
Merve Aydin ◽  
Carolina Candelise ◽  
Natascia Coda ◽  
Giovanni Morone ◽  
...  
Keyword(s):  
Virtual Reality ◽  
User Satisfaction ◽  
Cognitive Abilities ◽  
Healthy Subjects ◽  
Aesthetic Experience ◽  
Motor Task ◽  
Mozart Effect ◽  
Task Load ◽  
Creative Art ◽  
Nasa Task Load Index

The vision of an art masterpiece is associated with brain arousal by neural processes occurring quite spontaneously in the viewer. This aesthetic experience may even elicit a response in the motor areas of the observers. In the neurorehabilitation of patients with stroke, art observation has been used for reducing psychological disorders, and creative art therapy for enhancing physical functions and cognitive abilities. Here, we developed a virtual reality task which allows patients, by moving their hand on a virtual canvas, to have the illusion of painting some art masterpieces, such as The Creation of Adam of Michelangelo or The birth of Venus of Botticelli. Twenty healthy subjects (experiment 1) and four patients with stroke (experiment 2) performed this task and a control one in which they simply colored the virtual canvas. Results from User Satisfaction Evaluation Questionnaire and the NASA Task Load Index highlighted an appropriate level of usability. Moreover, despite the motor task was the same for art and control stimuli, the art condition was performed by healthy subjects with shorter trajectories (p = 0.001) and with a lower perception of physical demand (p = 0.049). In experiment 2, only the patients treated with artistic stimuli showed a reduction in the erroneous movements performed orthogonally to the canvas (p &lt; 0.05). This finding reminds the so-called Mozart effect that improves the performance of subjects when they listen to classic music. Thus, we called this improvement in the performance when interacting with an artistic stimulus as Michelangelo effect.

Perceived Mental Workload in an Endocopic Surgery Simulator

2005 ◽  
Vol 49 (11) ◽  
pp. 1014-1018 ◽  
Author(s):  
Martina I. Klein ◽  
Michael A. Riley ◽  
Joel S. Warm ◽  
Gerald Matthews
Keyword(s):  
Endoscopic Surgery ◽  
Mental Workload ◽  
Depth Information ◽  
Target Tissue ◽  
Task Load ◽  
Normal Hand ◽  
Multiple Resource ◽  
Nasa Task Load Index ◽  
Surgery Simulator ◽  
Experimental Effort

Endoscopic surgery–a procedure wherein a target organ is displayed on a monitor and physicians use graspers to manipulate the tissue - has benefits for patients in terms of reduced blood loss, infection, and pain. However, physicians' informal reports indicate that this type of surgery is challenging to perform. These challenges arise from the need to view the target tissue on a monitor, resulting in reduced depth information as well as a disruption of the normal hand-eye mapping. This study represents the initial experimental effort to assess the workload demands experienced in an endoscopic surgery simulator using the NASA-Task Load Index (TLX), a well validated workload measure, and the Multiple Resource Questionnaire (MRQ), a newly developed workload scale. The TLX revealed that the workload experienced in the simulator was indeed high. Additionally, the MRQ revealed different workload profiles associated with different levels of handeye mapping disruption.

NASA-Task Load Index--Modified

2011 ◽  
Author(s):  
Jane S. Prichard ◽  
L. A. Bizo ◽  
R. J. Stratford
Keyword(s):  
Task Load ◽  
Nasa Task Load Index

Workload of learners during simulated paediatric cardiopulmonary resuscitation

2020 ◽  
pp. bmjstel-2020-000652
Author(s):  
Ann L Young ◽  
Cara B Doughty ◽  
Kaitlin C Williamson ◽  
Sharon K Won ◽  
Marideth C Rus ◽  
...  
Keyword(s):  
Emergency Medicine ◽  
Cardiopulmonary Resuscitation ◽  
Descriptive Study ◽  
Emergency Nurses ◽  
Physical Demand ◽  
Task Load ◽  
Mental Demand ◽  
Simulation Based ◽  
Workload Distribution ◽  
Nasa Task Load Index

IntroductionLearner workload during simulated team-based resuscitations is not well understood. In this descriptive study, we measured the workload of learners in different team roles during simulated paediatric cardiopulmonary resuscitation.MethodsPaediatric emergency nurses and paediatric and emergency medicine residents formed teams of four to eight and randomised into roles to participate in simulation-based, paediatric resuscitation. Participant workload was measured using the NASA Task Load Index, which provides an average workload score (from 0 to 100) across six subscores: mental demand, physical demand, temporal demand, performance, frustration and mental effort. Workload is considered low if less than 40, moderate if between 40 and 60 and high if greater than 60.ResultsThere were 210 participants representing 40 simulation teams. 138 residents (66%) and 72 nurses (34%) participated. Team lead reported the highest workload at 65.2±10.0 (p=0.001), while the airway reported the lowest at 53.9±10.8 (p=0.001); team lead had higher scores for all subscores except physical demand. Team lead reported the highest mental demand (p<0.001), while airway reported the lowest. Cardiopulmonary resuscitation coach and first responder reported the highest physical demands (p<0.001), while team lead and nurse recorder reported the lowest (p<0.001).ConclusionsWorkload for learners in paediatric simulated resuscitation teams was moderate to high and varied significantly based on team role. Composition of workload varied significantly by team role. Measuring learner workload during simulated resuscitations allows improved processes and choreography to optimise workload distribution.

scholarly journals A-111 The Relationship between Bilingualism and Perceived Workload on the Symbol Digit Modalities Test in Traumatic Brain Injury Survivors

2020 ◽  
Vol 35 (6) ◽  
pp. 904-904
Author(s):  
Lopez-Hernandez D ◽  
Litvin P ◽  
Rugh-Fraser R ◽  
Cervantes R ◽  
Martinez F ◽  
...  
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Language Use ◽  
Group Differences ◽  
Task Load ◽  
Language Groups ◽  
Perceived Workload ◽  
Nasa Tlx ◽  
Nasa Task Load Index ◽  
The Relationship

Abstract Objective We evaluated perceived workload (measured by the NASA Task Load Index; NASA-TLX) as related to Symbol Digit Modalities Test (SDMT) performances in monolingual and bilingual traumatic brain injury (TBI) survivors and healthy comparison participants (HC). Method The sample consisted of 28 TBI survivors (12 monolinguals & 16 bilinguals) and 50 HC (20 monolinguals & 30 bilinguals). SDMT written (SDMT-W) and SDMT oral (SDMT-O) were used to evaluate group differences. Results ANCOVA, controlling for age, revealed that the HC group outperformed the TBI group on SDMT-W, p = .001, and SDMT-O, p = .047. Furthermore, bilinguals outperformed monolinguals on SDMT-W, p = .017. On the NASA-TLX, an interaction emerged on temporal demand rating, p = .023, with TBI bilinguals reporting higher temporal demand on SDMT tasks compared to TBI monolinguals, while the HC monolingual participants reported higher temporal demands ratings compared to HC bilingual participants. Furthermore, monolingual participants showed higher levels of frustration with regard to the SDMT task compared to bilingual participants, p = .029. Conclusion Our data revealed TBI survivors underperformed on both SDMT trials compared to the HC participants. Also, bilingual participants demonstrated better SDMT-W performances compared to monolingual participants. Furthermore, our TBI bilingual sample reported themselves to be more rushed to complete the SDMT compared to monolingual TBI sample, but they were less frustrated. Meanwhile, our HC monolingual sample felt more rushed to complete the SDMT tasks compared to HC bilingual participants, but they were less frustrated. While we observed differences in workload ratings between language groups, it is unclear if language use, and/or other variables are driving these results.

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