• Journal of the Ergonomics Society of Korea
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• v.28 no.3
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• pp.27-31
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• 2009

To evaluate the usability of a Kimchi refrigerator, we performed an evaluation test that consisted of an experiment and a post-hoc questionnaire survey. In this study, we focused on the older women who have less physical and cognitive ability than younger women. In physical usability, there was no significant difference between the older and the younger subject group. However, there was some significant statistical difference in the results of cognitive usability test. When the subjects debriefed their operations after finishing the experiment, the all subjects in the older group reported the difficulties in identifying the labels and icons in the control panel and in understanding operation sequences. Also, they couldn't learn and remember the operation procedures well. Based on the analysis of the video protocols, some causes of the problems were found and then several improvement ideas were suggested.

• Journal of the Korea Society of Computer and Information
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• v.10 no.4 s.36
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• pp.149-154
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• 2005

Computer center of university or company manages many non fault-tolerant servers and network devices to spare expenses. Because a service fault occurs sometimes by worm virus, system bug etc, we need a technique to detect it for continuing service. This paper introduces design and implementation of the system to observe many heterogeneous services, and web-based interface improving convenience of system manager. A system fault is reported to system managers via email or SMS by introduced service observation system, not service user. Then system managers can recover the system fault by this notification and minimize a fault period.

• Journal of Institute of Control, Robotics and Systems
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• v.13 no.12
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• pp.1173-1178
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• 2007

Ubiquitous sensor network (USN) is composed of many sensor nodes which are one of the simplest form of embedded system. In developing the sensor network system, a debugging tool is necessary to test and verify the system. Recently, a so-called packet analyzer has been developed for this purpose, and it supports IEEE 802.15.4 which is considered as the standard for the sensor network protocols. The major function of the packet analyzer is to take RF packets from sensor nodes and show the structure and the data of the packets graphically to the user. However, the conventional packet analyzers do not support remote control because they require a USB interface along with a personal computer. To make it available for remote control, we propose a new packet analyzer based on a server-client scheme in which a server program is implemented on embedded Linux and a client program is implemented on Windows for convenient use.

• Korean Journal of Materials Research
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• v.24 no.7
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• pp.381-387
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• 2014

The ${\beta}$-transus temperature in titanium alloys plays an important role in the design of thermo-mechanical treatments. It primarily depends on the chemical composition of the alloy and the relationship between them is non-linear and complex. Considering these relationships is difficult using mathematical equations. A feed-forward neural-network model with a back-propagation algorithm was developed to simulate the relationship between the ${\beta}$-transus temperature of titanium alloys, and the alloying elements. The input parameters to the model consisted of the nine alloying elements (i.e., Al, Cr, Fe, Mo, Sn, Si, V, Zr, and O), whereas the model output is the ${\beta}$-transus temperature. The model developed was then used to predict the ${\beta}$-transus temperature for different elemental combinations. Sensitivity analysis was performed on a trained neural-network model to study the effect of alloying elements on the ${\beta}$-transus temperature, keeping other elements constant. Very good performance of the model was achieved with previously unseen experimental data. Some explanation of the predicted results from the metallurgical point of view is given. The graphical-user-interface developed for the model should be very useful to researchers and in industry for designing the thermo-mechanical treatment of titanium alloys.

• Journal of Construction Engineering and Project Management
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• v.8 no.1
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• pp.10-21
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• 2018

Many construction projects involve a plethora of safety-related problems that can cause loss of productivity, diminished revenue, time overruns, and legal challenges. Incorporating data collection and analytics methods can help overcome the root causes of many such problems. However, in a dynamic construction workplace collecting data from a large number of resources is not a trivial task and can be costly, while many contractors lack the motivation to incorporate technology in their activities. In this research, an Android-based mobile application, Preemptive Construction Site Safety (PCS2) is developed and tested for real-time location tracking, trajectory prediction, and prevention of potential collisions between workers and site hazards. PCS2 uses ubiquitous mobile technology (smartphones) for positional data collection, and a robust trajectory prediction technique that couples hidden Markov model (HMM) with risk-taking behavior modeling. The effectiveness of PCS2 is evaluated in field experiments where impending collisions are predicted and safety alerts are generated with enough lead time for the user. With further improvement in interface design and underlying mathematical models, PCS2 will have practical benefits in large scale multi-agent construction worksites by significantly reducing the likelihood of proximity-related accidents between workers and equipment.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.13 no.1
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• pp.69-76
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• 1999

This paper proposed a design of intelligent supervisory control systems for maintenance of highway traffic information equiprrent and processing algorithm of equiprrent fault data. The fault data of highway traffic equipment are transmitted from rerrnte supervisory controller to central supervisory system by real time, the transmitted fault data are anaIyzed the characteristic using evaluation algorithm of fault data in central supervisory system. The evaluation algorithm includes a neural network and fault knowlOOge-base for processing the multi-generated fault data. For validating the evaluation algorithm of intelligent supervisory control systems, the rrethod of analysis used to the five pattern of binary signal by transmitted real time and the opTclting user-interface constructed in central supervisory system.

• Journal of Power Electronics
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• v.2 no.4
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• pp.250-257
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• 2002

This paper introduces the Interactive Power Electronics Seminar - iPES - a new software package for teaching of fundamentals of power electronic circuits and systems. iPES is constituted by HTML text with Java applets for interactive animation, circuit design and simulation and visualization of electromagnetic fields and thermal issues in power electronics. It does comprise an easy-to-use self-explaining graphical user interface. The software does need just a standard web-browser, i.e. no installations are required. iPES can be accessed via the World Wide Web or from a CD-ROM in a stand-alone PC by students and professionals. Due to the underlying software technology iPES is very flexible and could be used for on-line learning and could easily be integrated into an e-learning platform. The aim of this paper Is to give an introduction to the iPES-project and to show the different areas covered. The e- learning software is available at no costs at $\underline{www.ipes.ethz.ch}$ in English, German, Japanese, Korean, Chinese and Spanish. The project is still under development and the web page is updated in about 4 weeks intervals.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.6A
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• pp.848-854
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• 2000

Network management in TMN concerns to the operating system and communication equipments in network, and defines them as objects. GDMO(guidelines for the Definition of Managed Objects) is used to describe those objects. GDMO is not directly used for managing the network, but translated into a language with object-oriented paradigm. And GDMO refers to ASN.1(Abstract Syntax Notation One) for manage objects. This paper presents design and implementation techniques for the translator which automatically translates the specification of ASN.1 and GDMO to the object-oriented language for generating MIB(Managed object Instance Base). This system, unlike the existing source code generator, is designed to generate various object-oriented languages automatically, which are used to generate Managed object Instance Base(MIB). And the system includes various graphic user interface to enhance the development environment of ASn.1 and GDMO

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.463-466
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• 2004

최근 Device 의 대중화로 모바일 폰 사용자는 언제 어디서라도 정보서비스 및 멀티미디어 동영상 서비스를 쉽게 접할 수 있게 되었다. 하지만, 작은 화면과 불편한 User Interface 를 가진 모바일 Device 의 한계와 양적인 컨텐츠의 증가로 인하여 사용자가 원하는 정보를 Access 하기에는 너무 많은 시간과 비용이 소요되고 있다. 본 논문에서는 사용자의 Accessibility 욕구를 충족하고 시간과 비용을 절감하기 위한 방법으로서 무선 인터넷 환경에서의 추천 시스템을 기반으로 방대한 분량의 뉴스 컨텐츠 가운데 개인화 된 뉴스를 선별, 제공해 주는 지능형 추천 시스템을 설계 구현하고자 한다. 본 논문은 인공 지능 분야 중 에이전트의 추천 역할과 기능면에서 Collaborative Filtering 방법이 갖고 있는 계산 속도 문제에 대한 대안으로서, 유사한 선호도의 사용자를 특성에 따라 분류하기 위해 군집분석을 이용했으며, 각 군집별로 뉴스 카테고리를 Weighting 한 후, 뉴스 컨텐츠를 Scoring, Listing하여 사용자가 읽은 뉴스에 대한 평가를 기록하고 이틀 각 군집별로 반영하는 방법을 수행하였다. 추가로 뉴스 컨텐츠의 사용자 만족도를 평가하기 위하여 뉴스를 처음부터 끝까지 읽은 완독률을 측정기준으로 제시하고 일반적인 무선 인터넷 환경하의 뉴스 메뉴체계와 비교하여 설계된 시스템의 성능에 대한 유효성을 검증하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.233-236
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• 2004

일반적으로 디지털 카메라나 캠코더, PC와 같은 제품에서 만들어진 이미지나 오디오 파일들은 다른 멀티 미디어 제품에서 재생하기 위하여 각종 휴대용 메모리카드에 저장된다. 본 논문에서는 이런 메모리 카드에 저장되어 있는 이미지나 오디오를 다양한 기능과 고 화질,고 음질을 제공하는 디지털 TV에 적용할 수 있는 시스템을 제안하고 있다. 제안한 시스템은 크게 JPEG 모드와 MP3 모드로 나누어지는데, JPEG 모드에서는 이미지 회전, 확대 및 화면 이동 등의 기능과 다양한 슬라이드 쇼를 제공하고 MP3 모드에서는 선택 재생, 전체 재생, 반복 재생 등의 기능을 제공함으로써 사용자들이 일반 가정에서 디지털 TV의 다양한 멀티미디어 기능을 즐길 수 있도록 하였다. 또한 사용자들에게 편리한 User Interface(UI)를 제공함으로써 PC 에 익숙하지 않은 사용자들도 쉽게 이용할 수 있을 것으로 기대된다.