Myung Hwan Yun

• Doctor of Philosophy
• Professor (Full) at Seoul National University

Background The conventional Work Triangle principle has long been a guiding concept in kitchen design, aiming to optimize workflow and minimize workload. However, with the advent of modern appliances and evolving lifestyles, the effectiveness of the Work Triangle in addressing the diverse activities and needs of contemporary kitchens is increasingl...

Global automakers are implementing strategies to increase the adoption of electric vehicles (EVs) due to environmentally friendly policies. While extensive research has been conducted on various aspects of EVs, there is a lack of understanding from the perspective of human factors that could impact EV usability. This study, therefore, aimed to fill...

There are various studies to investigate the factors that affect driving experiences in the automobile environment and auditory experiences as variables. These factors might eventually affect users' sensitivity and performance of driving-related and non-driving-related tasks. Research on mechanical and electrical technology development is significa...

The auditory experience of driving electric vehicles (EVs) has been studied as a means of conveying vehicle status information and improving user satisfaction. However, the driving experience and user preferences may vary depending on the driving context, including user characteristics. Thus, this study aims to 1) classify users based on their char...

Motion sickness is a significant research topic that can impede the widespread adoption of Internal combustion vehicles (ICV), electric vehicles (EV), and automated vehicles (AV). As the technologies for EVs and AVs continue to advance, Numerous studies have been conducted to investigate motion sickness in vehicle environments considering more deta...

This study aims to explore the classification of lower body types among Korean women using the Fuzzy C-means clustering approach. It is important to investigate various shapes of the human body in product design. Previously, most studies focused on specific body parts or targeting specific user groups, and considered variations based on factors suc...

This paper investigates the ChatGPT research landscape, key themes, and connections of recent studies in three major domains of computer science (CS), social science (SS), and medical (MED). 822 studies containing ‘ChatGPT’ in the title, keywords, and abstract were collected from research databases such as Scopus, Web of Science, and ScienceDirect....

Purpose: This study proposes a therblig-based evaluation technique as a new accessibility tool for physical products like home appliances that spinal cord injured users occasionally use. Material and methods: This study recruited nine spinal cord injured users for the interview and observation regarding home appliance usage and analytically stru...

Multimodal interaction (MMI) is being widely implemented, especially in new technologies such as augmented reality (AR) systems since it is presumed to support a more natural, efficient, and flexible form of interaction. However, limited research has been done to investigate the proper application of MMI in AR. More specifically, the effects of com...

Vehicle sound design is gaining attention in the automotive industry, especially for Electric Vehicles (EV). For EVs, acceleration sound is critical for both user experience (UX) and safety. Despite the abundance of UX-related studies investigating the external presentation of acceleration sound for EVs, internal presentation of acceleration sound...

This study aims to explore the eating-out experience of people with vision impairment (VI) with the persona method. People with VI are not privileged with information due to limited accessibility. Previous studies have suggested kiosks are the main barrier in the eating-out experience of people with VI. However, the quality of the experience of peo...

The purpose of this study is to determine the differences in stress-level and attentional functions between experienced and novice drivers during intersection-related hazard situations. A simulation experiment was conducted on 21 licensed drivers (15 males and 6 females, mean age 27.86 ± 3.32), categorized into two groups (experienced and novice) b...

Background: Today, sedentary lifestyles are very common for children. Therefore, maintaining a good posture while sitting is very important to prevent musculoskeletal disorders. To maintain a good posture, the formation of good postural habit must be encouraged through posture correction. However, long-term observation is required for effective po...

Objective The study aims to develop a mHealth application for seizure management based on the human system integration (HSI) approach. Background Unmet healthcare needs among people with epilepsy continue to exist despite the advancement in healthcare technology. Current seizure management methods are found to be ineffective. Therefore, a more eff...

Various types of biosignals can be measured and utilized to monitor and predict user behavior. In particular, by using wearable sensors and imaging techniques, it has become possible to obtain related information while minimizing user behavior disruption. However, existing analytic models for user behavior prediction do not accurately grasp the fea...

The main goal of this study is to develop a model of subjective feelings for frontal visibility, often called the feeling of ‘openness’, for automobile drivers. Moreover, this study proposed a method to overcome the limitations of the rating scale method, although it has been used in a great number of studies. To this end, eight potential design va...

Clutter in tactical situation displays (TSD) is a persistent problem that affects pilots’ performance. Decluttering methods such as dimming, dotting, small-sizing and removal have been used in several display types to reduce clutter. This study aims to investigate the effects of different decluttering methods applied in TSD on pilots’ visual search...

Leans illusion is a type of Spatial Disorientation (SD) that pilots often experience which can adversely affect flight performance. For pilots’ flight safety, research on how to effectively overcome SD such as leans illusion is important. The purpose of this study is to identify the overcoming effect of Galvanic Vestibular Stimulation (GVS) technol...

Among various personal mobility devices, the electric kick scooter is the most actively distributed product worldwide in the form of personal use or sharing services. With the dissemination, numerous accidents related to electric kick scooters occurred. In order to verify the factors that increase the risk of using electric kick scooters, we design...

Interest in the development of multimodal interaction modalities (e.g. visual, auditory, haptics etc.) has become more prominent. Despite this strong interest in multimodality, research on this domain remains to be quite a few. The present study aims to review the current literature regarding multimodal interaction in intelligent systems, specifica...

Navigation is a representative task in a virtual environment (VE). The locomotion methods affect the navigation performance and can cause involuntary movements by the users, which may cause critical safety problems. Thus, this study examined the effects of different locomotion methods on the users’ involuntary position shift (IPS) and navigation pe...

Background: Despite the benefits of using electronic medical record (EMR) systems, existing studies show that many healthcare providers are uncertain regarding their usability. The usability issues of these systems decrease their efficiency, discourage clinicians, and cause dissatisfaction among patients, which may result in safety risks and harm....

Smart glasses require additional structures to perform smart functions, which increases their weight and results in an uneven weight distribution. Excessive weight increase and weight balance issues could cause discomfort; thus, guidelines regarding the appropriate weight profile of smart glasses are needed. The aim of this study is to propose an a...

Efficient visual search and accurate target detection are crucial during flight operations. Despite the continuous effort to improve cockpit displays, visual complexity remains to be a problem that affects pilots’ search and detection performance. This has become more evident with the integration of high fidelity and information loaded cockpit disp...

This paper systemically reviews and clarifies the state-of-the-art HRI evaluation studies especially for the usability of social robots. A total of 36 articles were collected through a keyword, abstract, title search from various online search engines. Afterwards, 163 measures were selected and reviewed carefully. This research was classified into...

Smartphones are currently among the most common handheld devices. Previous studies on such handheld touchscreen devices focused on thumb operations or reach zones by measuring individual muscle or joint angles. However, they were limited to thumb operations and did not consider grasping. In this study, we investigated the grasp types of touchscreen...

Disabled and elderly populations may not fully appreciate the benefits of advanced technologies and every-day products due to accessibility issues. However, the diverse characteristics of disabled and elderly users make conducting user research a challenging task for stakeholders who oversee the needs of developing accessible products. They need a...

BACKGROUND: Circumstances in flight can adversely affect a pilots spatial abilities and lead to spatial disorientation (SD), increasing the potential for fatal accidents. To systematically understand the impact of SD, it is important to quantitatively and qualitatively analyze pilots flight performance and mental stress, and to verify the effective...

Spatial disorientation (SD) can adversely affect a pilot’s flight mission and cause critical flight accidents. To ensure a pilot’s flight safety, it is important to understand the impact of SD on a pilot’s flight performance and mental stress levels, and it is necessary to verify the effectiveness of using verbal reports (VR) for pilots to overcome...

The aim of this study is to compare the cross-cultural differences in product preference among users from different countries, taking Mi band 3 as a case study. With the development of global market, more and more products and services are sold across the globe. Users from different cultures have different behaviors, cognitive styles, and value sys...

Customer needs and user contexts play an important role in generating ideas for new products or new functions. This study proposes a novel framework for identifying customers’ unmet needs on online social media using the Context Tree through the Hierarchical Search of Concept Spaces (HSCS) algorithm. The Context Tree represents the hierarchical str...

Accidents related to electric kick scooters, which are widespread globally, are increasing rapidly. However, most of the research on them concentrates on reporting accident status and injury patterns. Therefore, while it is necessary to analyze safety issues from the user’s perspective, interviewing or conducting a survey with those involved in an...

Virtual reality (VR) has been implemented in various applications such as gaming, e-learning, rehabilitation, etc. Although many studies have been conducted to evaluate the user experiences (UX) of various applications in VR, there are few studies evaluating the UX of VR in a holistic view. Since user experience means holistic feelings caused by at...

When developing a user-oriented product, it is crucial to consider users’ affective needs. Various semantic differential (SD) methods have been used to identify affect regarding materials, and this is the most important property in products. This study aims to determine which of the three conventional SD methods (absolute evaluation 1 [AE 1], absol...

Wrist-worn wearable technologies such as smartwatches are seen to be one of the breakthrough devices that would help older adults age successfully. However, to date, there is still a lack of systematic evaluation of smartwatch adoption for older adults. Thus, in order to gain a better understanding of older adults’ attitude towards the acceptance o...

The military backpack used by the infantry imposes the greatest load on the body and, thus, is also the cause of most user complaints. This study (1) establishes a systematic development procedure for a military backpack that reflects user opinion; (2) suggests a usability questionnaire tool that can identify realistic user needs; and (3) proposes...

Virtual reality (VR) is receiving attention enough to be considered as its revival age in both industrial and academic field. Since VR systems have various types of interaction with users and new types of interaction are constantly being developed, various studies investigating user experience (UX) of VR systems are continuously needed. However, th...

To develop a flexible display, smartphones with edge screens with curved displays on both sides of the main screen have been used widely. Considering that small differences in the form of smartphones, such as length, width, and thickness, could affect user experience, the effects of the curvature of the edge screen should be identified. This study...

This study explores TV viewers’ user experience (UX) of the conversational agent (CA) assisted interactions while watching TV. In the human-computer interaction field, the user experience is primarily measured through performance and subjective self-reported data. But TV is an entertainment medium, the user experience of TV viewers should be determ...

The naval multi-function console provides various types of information to the operator. It is equipment that is key for submarine navigation, and fatal human errors can occur due to the mismatch between the console specifications and the operator’s body size. This study proposes a method for deriving console specifications suitable for the body siz...

To achieve marketing success, automobile companies are constantly striving to develop design elements that can create effective experiences for customers and establish their brand identity. Among the various design elements, engine sound is an important feature, which has been widely studied to understand the subjective feeling of the sound quality...

Clutter problem of modern cockpit displays can occur frequently due to a large amount of information. So, decluttering less important information is required to minimize search time to find target information and prevent human error in interpreting display information. This study is to compare human search performance by visual complexity levels an...

Virtual reality (VR) is receiving enough attention to be regarded as a revival era and technologies related to the implementation of VR systems continue to evolve. VR systems are applied not only in entertainment but also in various fields such as medicine, rehabilitation, education, engineering, and military (Aïm, Lonjon, Hannouche, & Nizard, 2016...

Background: The use of school furniture with a height that is anthropometrically mismatched can lead children into taking awkward postures while sitting. In Korea, desks and chairs for primary schools have seven different height levels, and these levels are regulated by the national standard KSG-2010. These levels serve to accommodate children of...

The study on XR’s; a superset of augmented reality (AR), virtual reality (VR), and mixed reality (MR), headsets was found to be sporadic and decentralized especially with regards to studies on the hardware of the virtual environment system. However, as the interest on artificial reality such as XR is increasingly on the rise, there is lack of study...

The cover image is based on the Research Article Exploring the relationship between psychoacoustic and affective variables in a shutter‐press sound by Ye Lim Rhie, Ga Won Kim, and Myung Hwan Yun et al., https://doi.org/10.1002/hfm.20794.

Purpose Sitting in a chair is a typical act of modern people. Prolonged sitting and sitting with improper postures can lead to musculoskeletal disorders. Thus, there is a need for a sitting posture classification monitoring system that can predict a sitting posture. The purpose of this paper is to develop a system for classifying children’s sittin...

Whereas smart products have emerged as a new product category, almost no studies have introduced product sounds that give a smart impression. Moreover, technological development has increased the need to shape or design consequential sounds, which have been recognized to depend on the mechanical properties of a product. Therefore, we introduce an a...

The technical performance of recent automobiles is highly progressed and standardized across different manufacturers. This study seeks to derive a semantic space of engine acceleration sound quality for end users and identify the relation with sound characteristics. For this study, two affective attributes: ‘refined’ and ‘powerful’, and eight acous...

This study investigated the effect of task demand transitions at multiple levels of analysis including behavioral performance, subjective rating, and brain effective connectivity, while comparing human data to Adaptive Control of Thought-Rational (ACT-R) simulated data. Three stages of task demand were designed and performed sequentially (Low-High-...

In the era of numerous consumer products with advanced technologies, there are unexpectedly large number of population being discriminated – although unintentional – from benefits of such products, namely people with disabilities. To prevent such discrimination, many countries and organization have published design guidelines for manufactures to ac...

Inclusive design means a design that is designed to enable everyone to use products, architecture, and environmental services more easily and safely, regardless of the presence or absence of disability and age.

As the technical performance of products progresses, it is becoming more important to design products that satisfy customers' affective experiences. Hence, many studies about Kansei engineering or Kansei design have been conducted to develop products that can satisfy customers' affective experiences. In the Kansei design method, it is important to...

With growing interest in the topic of smart computing and context-aware services, identifying driver's intention has become important in automotive industry. Among existing studies on driver assistance systems, few studies have used the concept of the levels of processing (LOP) to understand driver's information processing. This paper introduces ex...

This study analyzed the anthropometric mismatch between the height systems of the primary school furniture and children in Korea. The results revealed that the height systems of present desks matched the height of only half of the children. The cause of this was a drawer attached underneath the desk board. In case of the height system of present ch...

Background Personal Mobility Device (PMD) refers to ‘Smart Mobility’ or ‘Micro Mobility’ for one or two persons, and it is appreciated as an environmental-friendly means operated by electric resources (Burns, 2013). According to Transparency Market Research in 2016, the world’s personal transport market is expected to grow two times bigger from 201...

Musculoskeletal disorders (MSDs) have been recognized as one of the main occupational health problems among health care workers. Many studies have suggested the influence of psychosocial factors on MSDs. The objective of this study is to look into the association between psychosocial factors and the prevalence of MSDs symptoms among internship doct...

Sitting on a chair in an awkward posture or sitting for a long period of time is a risk factor for musculoskeletal disorders. A postural habit that has been formed cannot be changed easily. It is important to form a proper postural habit from childhood as the lumbar disease during childhood caused by their improper posture is most likely to recur....

The sound of a door opening on a vehicle has a main influence on psychological comfort and affective satisfaction for the vehicle. This study aims to evaluate the auditory pleasantness of the door opening sound and to derive the sound parameters, which can optimize that pleasantness. Fourteen different door opening sounds were selected and recorded...

This study aims to analyze and categorize user experience (UX) of smartphones by utilizing social media data (Twitter). Social media (e.g., Facebook, Twitter) can be helpful for observing natural UX through the users’ words. It is a potentially valuable source of data that can be used to examine the thoughts of millions of people. To gather UXs of...

The cover image, by Ilsun Rhiu et al., is based on the Research Article Affective experience of physical user interfaces: Similarities and differences among control types, DOI 10.1002/hfm.20722.

The estimation of stature using foot and hand dimensions is essential in the process of personal identification. The shapes of feet and hands vary depending on races and gender, and it is of great importance to design an adequate equation in consideration of variances to estimate stature. This study is based on a total of 5,195 South Korean males a...

Eye mouse devices are operated by ocular movements, which have proven to be useful for disabled people who find eye control to be the easiest input method. However, there are few studies comparing the two typical click methods for eye mouse (blink and dwell) in identical experimental conditions for general object selection operations. Especially, i...

This study aims to determine similarities and differences in affective experience when manipulating 3 physical user interfaces (PUIs): button, touch screen, and jog dial inputs. First, we conducted literature and expert reviews to identify key affective experiences of PUI manipulation. As a result, seven affective experiences (Softness, Elasticity,...

Body mass index (BMI) is most widely used as an indirect measure of fat mass due to its convenience. However, according to previous studies, the poor degree of agreement in obesity classification between BMI and percent body fat was found (Al-Mohaimeed, Ahmed, Dandash, Ismail, & Saquib, 2015; Flegal et al., 2009; Freedman & Sherry, 2009); usefulnes...

As the penetration rate of Smartphone grows high and the market gets saturated, the technological and aesthetic progress for manufacturers are heavily demanded to sustain their market share. To meet such demands, manufacturers continuously improve the design of their products. As the design of smartphone varies by manufacturers, there have been man...

The purpose of this study is to examine the difference in the tactile perception between designers and customers for leathers in vehicle interiors and to derive preference models that describe the relationship between the tactile perception and physical measurements the leathers. An experiment was performed on ten natural leathers manufactured in t...

This paper aims to establish a systematic process of developing a brand driving sound. Firstly, principal factors of a brand sound identity are extracted from factor analysis of many sample cars. As a result, brand sound positioning map is drawn using jury test data. Also, the multiple regression analysis of subjective and objective test results is...

Background: Musculoskeletal disorders (MSDs) have been recognized as one of the main occupational health problems for dentists. Many studies have suggested that dentists experience work-related pain or discomfort in the neck, shoulder, and back, as well as in other parts of the body. Objective: This study aimed to examine the relationship betwee...

A console of a submarine is a collection of user interfaces composed of control devices and two vertically installed displays. Since console operators receive most visual information from these displays for a long time, it may cause musculoskeletal disorders and psychological discomfort if the screen is not in the right position. Therefore, the aim...

Objective: This research is aimed to promote the use of robotic agent among older people by providing analysis of robotic agent in various acceptance factors. Background: Due to the increase of older adult population, having the ability to independently participate in social activities for older people has been recognized as a solution to problems...

This study aims to study lower body type classification using fuzzy clustering technique. Knowledge about human body is important in product design. Previously, most studies used the crisp classification methods, but this method had limitations in explaining human body types. For this research, firstly we collected lower body analysis and preproces...

Smart TV means a multi-purpose TV that can go beyond conventional TV functions and enable the Internet and various application programs. Smart TV is expected to play a more important role in the era of Internet of Things. In this study, the design guidelines of GUI for smart TV are focused on the aspects of visibility and operability among various...

These days, the importance of Human Factors and Ergonomics (HF&E) when producing military systems is being increasingly recognized. However, existing literature and guidelines have predominantly focused on the minimum requirements rather than optimal parameters when HF&E departments have associated with designers and engineers. Thus, in this paper,...

The aim of this study was to understand impressions of product sounds by combining quantitative and qualitative findings through an empirical study using 10 camera shutter sounds. The evaluated impressions were smartness, friendliness, and satisfaction. Subjective ratings using 29 sound descriptors and paper-and-pencil interviews were performed wit...

A new Brain-Computer Interface (BCI) technique, which is called a hybrid BCI, has recently been proposed to address the limitations of conventional single BCI system. Although some hybrid BCI studies have shown promising results, the field of hybrid BCI is still in its infancy and there is much to be done. Especially, since the hybrid BCI systems a...

PRISMA checklist. (PDF)

With increasing recognition of user experience (UX), it became important to identify UX issues from customers’ opinions expressed in a form of text which is unstructured qualitative data. Since reliability of qualitative data has little been investigated, it requires much time and effort for researchers to define meanings and values from the qualit...

The aim of this study is to determine the effect of form factors (curvature rate, depth) of mobile devices on hand comfort when using large-screen curved mobile devices. To that end, four muscles (APB, APL, FDI, EDC) were selected and mockups for experiment were developed with four curvature rate levels (flat/100/200/300R) and five depth levels (3/...

This study attempted to identify the effect of the panel stiffness on the customers' affect, which was not addressed in the research field of affective engineering. For this, this study derived four affects related to the panel stiffness from literature and pre-experiment : hardness, deform consistency, thickness and satisfaction and prepared a que...