Da Young Ju

Kookmin University

Author Statistics

Papers

Citation

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i-10 index

Research Field

Gesture Interaction Design based on User Preference for the Elastic Handheld Device

Journal of the Ergonomics Society of Korea (2016)

Hoon Sik Yoo Da Young Ju

Objective: This study lays its aims at the definition of relevant operation method and function by researching on the value to be brought when applying smart device that can hand carry soft and flexible materials like jelly.BR Background: New technology and material play a role in bringing type transformation of interface and change of operation system. Recently, importance has been increased on the study of Organic User Interface (OUI) that conducts research on the value of new method of input and output adopting soft and flexible materials for various instruments.BR Method: For fulfillment of the study, 27 kinds of gestures have been defined that are usable in handheld device based on existing studies. Quantitative research of survey was conducted of adult male and female of 20s through 30s and an analysis was done on the function that can be linked to gestures with highest level of satisfaction. In order to analyze needs and hurdles of users for the defined gesture, a focus group interview was conducted aiming at the groups of early adopters and ordinary users.BR Results: As a result, it was found that users have much value regarding usability and fun for elastic device and analysis could be conducted on preferred gesture and its linkable functions.BR Conclusion: What is most significant with this study is that it sheds new light on the values of a device made of elastic material. Beyond finding and defining the gestures and functions that can be applied to a handheld elastic device, the present study identified the value elements of an elastic device - ‘usability and ‘fun’ -, which users can basically desire from using it.BR Application: The data that this study brought forth through preference and satisfaction test with the gestures and associated functions will help commercialize an elastic device in future.

USable

Interface (matter)

10.5143/jesk.2016.35.6.519

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Citations (1)

Data Preloading Technique using Intention Prediction

Lecture notes in computer science (2014)

Seung-Yup Lee Juwan Yoo Da Young Ju

10.1007/978-3-319-07227-2_4

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Citations (1)

Interior Design of Fully Autonomous Vehicle for Emotional Experience: Focused on Consumer’s Consciousness toward In-Vehicle Activity

Korean Society for Emotion and Sensibility (2018)

Ju Yeong Kwon Da Young Ju

10.14695/kjsos.2018.21.1.17

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Citations (8)

Multivariate zero-truncated/adjusted Charlier series distributions with applications

Journal of Statistical Distributions and Applications (2015)

Xiqian Ding Da Young Ju Guo‐Liang Tian

Although the univariate Charlier series distribution (Biom. J. 30(8):1003–1009, 1988) and bivariate Charlier series distribution (Biom. J. 37(1):105–117, 1995; J. Appl. Stat. 30(1):63–77, 2003) can be easily generalized to the multivariate version via the method of stochastic representation (SR), the multivariate zero-truncated Charlier series (ZTCS) distribution is not available to date. The first aim of this paper is to propose the multivariate ZTCS distribution by developing its important distributional properties, and providing efficient likelihood-based inference methods via a novel data augmentation in the framework of the expectation–maximization (EM) algorithm. Since the joint marginal distribution of any r-dimensional sub-vector of the multivariate ZTCS random vector of dimension m is an r-dimensional zero-deflated Charlier series (ZDCS) distribution (1≤r

Multivariate stable distribution

Univariate

Matrix t-distribution

10.1186/s40488-015-0029-5

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Autonomous Vehicle Simulation Project

International Journal of Software Engineering and Its Applications (2013)

Sang-Ho Lee Janghee Cho Da Young Ju

As the vehicle technology grows rapidly in these days, the factors of practicable tests are increasing. However, it can be exposed to critical conditions to perform field tests with unverified implementations, since when error occurs while driving, directly leads to an unpredictable accident. For this reason, there are various simulators in the market to ensure the safety and provide various kinds of results, yet they are only targeting high value industries with their remarkable expense, which makes private enterprises challenging to purchase. Therefore, in this paper, autonomous vehicle simulation software based on an open-source project is proposed to provide an extensible platform with public license to perform tests in the virtual world.

Implementation

Extensibility

10.14257/ijseia.2013.7.5.34

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Citations (7)

1G-14 Travel Experience with Collective Intelligence

The Japanese Journal of Ergonomics (2013)

Young Hoon Oh Da Young Ju

Smartphone has become a requisite for everyday life.We use it for checking e-mails, calling friends, and surfing mobile applications.Traveling with mobile phone is no exception.But existing media such as travel guidebook, blog, or current mobile applications are too difficult to organize information readily.Therefore, we propose the Collective Intelligence System (CIS) which resolves the inconvenience of travelers.The system is formed with the empirical knowledge of 'Local' and the check-in log of Social Network Service (SNS).As the system regulates certain reward for the tips, constituents are able to give helpful advice spontaneously.Moreover it can be applied to mobile application that the system provides usercentered travel route as well as share travel experience.We present Travel Preference Analysis (TPA) that analyzes the tendency of each user.It checks overall response to specific information when it is shown up on the mobile application.For example as user delete a destination among the given route, the application checks its character and try to figure out why it is excluded.Then TPA transfers the preference to the CIS.Therefore, the more users edit information, the better system improves the result.Our future work will explore more precise factors to provide user-centered travel experience.

Collective Intelligence

10.5100/jje.49.s476

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Social Curated Advertising Content Model on Facebook

한국콘텐츠학회 종합학술대회 논문집 (2012)

Yumin Shin Da Young Ju

Content (measure theory)

Source

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Citations (0)

A Magnetic Levitation System for Contactless Controlling Display Monitor Angles and Positions

대한인간공학회 학술대회논문집 (2013)

Young Hoon Shin Da Young Ju

Objective: We present our research on a system that controls position and orientation of display monitors using magnetic levitation. Background: Recently people spend longer and longer time than ever for watching various types of panel displays such as computer monitors, TVs and tablet pads. Watching a monitor in a fixed posture can cause physical problems in neck and back especially when viewing angle requires an uncomfortable posture. Method: In this paper, a magnetic levitation system is introduced that provides effortless noncontact control of monitor orientation and position/height for viewing comfort. It consists of: 1) multiple (two or more) permanent magnets that provide basic levitation, 2) multiple electromagnets that generate attractive and repulsive forces, and 3) a unit that controls the electromagnets for desired position and orientation. Results: Our system can accommodate most of the panel displays currently manufactured and may provide guidance for future their design. Conclusion: Good physical posture is important to the well-being of children, hospital patients, the old and the weak. Application: Our system can also be used to enhance the emotional and aesthetic satisfaction in viewing.

Magnetic Levitation

Electromagnet

Position (finance)

Source

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1G-36 Memorable Moment Extraction using the Pupil Dilation Analysis

The Japanese Journal of Ergonomics (2013)

Su Gon Kim Seong Hoon Moon Da Young Ju

These days, with the launch of Google glass, life-log which is recording videos and photos everyday has become reality.However, the stored data without indexing is meaningless and unattractive for users.Moreover, there is a problem that it is impossible to ensure storage for large amounts of data.Therefore, efficient meaningful data selection and automatic indexing will be important to be applied in practical use.In order to solve this problem, we propose a method that analyzing pupillary size variation through a camera device mounted on customized eye-glass.We use of the fact that if there are emotional changes, the pupillary size change.Recognition of emotional change is quite effective to extract a meaningful visual information automatically from the continuous recording of the view.Proposed system measures degree of expansion of the pupil diameter and picks a moment of rapid size change of pupil with camera.There are numerous studies to determine the emotional changes based on physiological signal processing such as EEG, ECG or GSR.Previous research usually attach the sensors to the body of the subjects in order to obtain a biological signal data although that is cause of discomfort.Hence, we propose new method to measure the size of the pupil only using lightweight camera.This has benefit that pupillary response time is much shorter than other signal and it can be reduced the analysis time remarkably.

Pupillary response

Dilation (metric space)

10.5100/jje.49.s559

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Citations (1)

Comparative Analysis of Requirements for Information Presentation on In-vehicle Display Systems by Driving Career

Transactions of Korean Society of Automotive Engineers (2016)

Bo Ram Gu Da Young Ju

The accelerated convergence of automobiles and ICT has led to an increase in in-vehicle electronic devices designed to enhance the safety and convenience of drivers. Consequently, the information presentation on in-vehicle display systems for drivers and passengers need to be taken into account in order to guarantee driving stability while satisfying the needs of UX-based design users. This study compared and evaluated requirements for information items shown on in-vehicle displays regarding driving safety and convenience by groups according to driving career. A total of 38 information items related to safety and convenience that can be displayed while driving and pulling over were collected. Their level of necessity was tested and evaluated by 234 drivers. Using the results, we conducted a comparative analysis on the requirements for information presentation on in-vehicle display systems by groups according to driving career.

Presentation (obstetrics)

Information display

Vehicle safety

Safe driving

10.7467/ksae.2016.24.6.668

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Citations (3)