• Title, Summary, Keyword: App state

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GUI-based Detection of Usage-state Changes in Mobile Apps (GUI에 기반한 모바일 앱 사용상태 구분)

  • Kang, Ryangkyung;Seok, Ho-Sik
    • Journal of IKEEE
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    • v.23 no.2
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    • pp.448-453
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    • 2019
  • Under the conflicting objectives of maximum user satisfaction and fast launching, there exist great needs for automated mobile app testing. In automated app testing, detection of usage-state changes is one of the most important issues for minimizing human intervention and testing of various usage scenarios. Because conventional approaches utilizing pre-collected training examples can not handle the rapid evolution of apps, we propose a novel method detecting changes in usage-state through graph-entropy. In the proposed method, widgets in a screen shot are recognized through DNNs and 'onverted graphs. We compared the performance of the proposed method with a SIFT (Scale-Invariant Feature Transform) based method on 20 real-world apps. In most cases, our method achieved superior results, but we found some situations where further improvements are required.

A Study on gamification exercise encouragement app based on GPS location information (GPS위치 정보를 기반으로 한 운동독려 게임화 앱 연구)

  • Park, Hyun-Joo;Keum, Chung-Ki
    • Journal of the Korea Convergence Society
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    • v.11 no.4
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    • pp.119-124
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    • 2020
  • In this paper, in order to encourage the user's exercise, we presented an exercise goal that considers the user's weight and exercise state, and dealt with a study on an app that gives a goal using GPS information. Unlike the vague numbers and times suggested in the existing app, it is presented specifically with the surrounding buildings or structures using GPS information. In addition, to use competitive psychology to exercise encouragement, it shows the movement information of people connected to the app and allows users to use the competitive psychology to get the effect of exercising many people. The app creates coordinates of major buildings and sets markings using the Naver Map SDK location information to present specific targets. It is easy for users to get bored if they give a goal every time, and the boredom that the user feels decreases the interest in the exercise. In order to not to lose interest in athletic interest. the app switches to game mode and give a light goal that doesn't matter user's weight or exercise status, and rewards user for achieving the suggested goals. Game mode is added to app that connects a person's will to practice. It adds fun elements to create interest, and uses competitiveness to help you live a healthy life with a steady workout. Technically, to improve the accuracy of smart-phone map display using GPS and the tilt processing was to be able to display the exact location.

The Effect of Background Services on Android Smartphone Performance (백그라운드 서비스가 안드로이드 스마트폰의 성능에 미치는 영향)

  • Ahn, Woo Hyun;Oh, Yunseok;Oh, Jaewon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.22 no.3
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    • pp.399-410
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    • 2018
  • In Android smartphones, many apps are developed as service apps to run in the background. If the memory is insufficient, Android forcibly terminates not only user apps that have not used the CPU for a long time, but also service apps. However, a service app is automatically re-launched after a short period of time, so that it continuously consumes memory space. This paper analyzes the number of running service apps and their memory usage in users' smartphones. The number of service apps accounts for up to 65% of the total number of running apps, and their memory usage accounts for up to 55% of the total memory. Moreover, we investigate the effect of the number of running service apps on the response time of smartphones and apps. As the number of service apps increases, the launching time of user apps increases to 22 times. The booting time and app installation time significantly increase with the number of service apps.

Privacy Situation and Countermeasures of Financial Apps based on the Android operating system (모바일 앱 개인정보 침해현황 및 대응방안 (금융, 안드로이드 운영체제 중심으로))

  • Kim, Bo;Lim, Jong-In;Jo, Yong-Hyun
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.14 no.6
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    • pp.267-272
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    • 2014
  • Customers who register at mobile banking service through startphone has 40Mil in first quarter of 2014, which was increased 8.5%(3.6Mil) compare to figure from end of year 2013. Average 1 trillion 627.6billion won is dealing through smartphone banking in daily and three for increased psychological bullying caused by malignant code which change normality to malignant. The results of the analysis current state of affairs of personal information collection management authority required in finance smartphone app service and also recommend solution for protecting finance consumers plans to minimized collecting personal information in smartphone finance app service.

Vortex dynamics in YBa$_2Cu_3O_7$ single crystals measured by micro Hall-probe array (Micro Hall probe array를 이용한 YBa$_2Cu_3O_7$ 단결정 내부의 자속 운동 측정)

  • Shim, Seong-Yeop;Hwang, Hyeon-Guk;Lee, Chang-Woo;Lee, Tae-Won;Kim, Dong-Ho
    • 한국초전도학회:학술대회논문집
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    • v.9
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    • pp.189-195
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    • 1999
  • We have studied the vortex dynamics in YBa$_2Cu_3O_7$ single crystals with columnar defects using micro Hall-probe array. The Hall-probe array technique allowed a simultaneous measurement of the time and spatial dependence of the vortex density so that more detailed information on flux dynamics could be obtained. We found that field profiles inside sample were similar to the Bean's critical state model from the magnetic hysteresis measurement. Normalized relaxation rates were maximum near the center and decreased toward the edge if applied field H$_{app}$ is greater than the penetration field H. But applied magnetic field H$_{app}$ is less than H, relaxation rates were minimum near the center and increased toward edge. We found that glassy exponent ${\mu}$ has the value of ${\sim}$ 1 whose corresponding vortex motion is half-loop excitation. However, single vortex creep, ${\mu}$ ${\sim}$ 1/7, was also found at 30 K and H$_{app}$ ${\cong}$ H'. Calculation of activation energy, U, was possible from direct analysis of the local relaxation data using the basic diffusion equation. From these results, we found that U increases logarithmically with time and U around center was lower than that at the edge.

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Car Sealer Monitoring System Using ICT Technology (ICT 기술을 융합한 자동차 실러도포 공정 모니터링 시스템)

  • Kim, Ho Yeon;Park, Jong Seop;Park, Yo Han;Cho, Jae-Soo
    • Journal of Information Technology Services
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    • v.17 no.3
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    • pp.53-61
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    • 2018
  • In this paper, we propose a car sealing monitoring system combined with ICT Technology. The automobile sealer is an adhesive used to bond inner and outer panels of doors, hoods and trunks of an automobile body. The proposed car sealer monitoring system is a system that can accurately and automatically inspect the condition of the automobile sealer coating process in the general often factory production line where the lighting change is very severe. The sealer inspection module checks the state of the applied sealer using an area scan camera. The vision inspection algorithm is adaptive to various lighting environments to determine whether the sealer is defective or not. The captured images and test results are configured to send the task results to the task manager in real-time as a smartphone app. Vision inspection algorithms in the plant outdoors are very vulnerable to time-varying external light sources and by configuring a monitoring system based on smart mobile equipment, it is possible to perform production monitoring regardless of time and place. The applicability of this method was verified by applying it to an actual automotive sealer application process.

Design of Loss-reduction Mechanisms for Energy Recovery Devices in Reverse-osmosis Desalination systems (역삼투 담수시스템용 에너지회수장치의 손실극복 메커니즘 설계)

  • Ham, Y.B.;Kim, Y.;Noh, J.H.;Shin, S.S.;Park, J.H.
    • Journal of the Korea Society For Power System Engineering
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    • v.16 no.3
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    • pp.5-9
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    • 2012
  • Novel mechanisms for Energy Recovery Devices are proposed to diminish the pressure loss in the high-pressure reverse-osmosis system. In the beginning, the state-of-the-art in the design of Energy Recovery Devices is reviewed and the features of each model are investigated. The direct-coupled axial piston pump(APP) and axial piston motor(APM) showed 39% energy recovery at operating pressure of reverse osmosis desalination systems, 60 bar. Meanwhile, the developed PM2D model, in which APM pistons are arranged parallel to those of APP, is more compact and showed higher efficiency in a preliminary test. Loss-reduction mechanisms employing rod piston and double raw valve port are additionally proposed to enhance the efficiency and durability of the device.

Clamping Voltage Characteristics and Accelerated Aging Behavior of CoCrTb-doped Zn/Pr-based Varistors with Sintering Temperature

  • Nahm, Ghoon-Woo
    • Transactions on Electrical and Electronic Materials
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    • v.10 no.4
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    • pp.125-130
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    • 2009
  • The clamping voltage characteristics and accelerated aging behavior of CoCrTb-doped Zn/Pr-based varistors were investigated for different sintering temperatures. The best clamping voltage characteristics were obtained for the varistors sintered at $1330^{\circ}C$, with a clamping voltage ratio (K) of 1.63 at a surge current of 5 A and 1.75 at a surge current of 10 A. The varistors sintered at $1330^{\circ}C$ exhibited the highest stability, with -0.1% in $%{\Delta}E_{1\;mA}$, -0.2% in $%{\Delta}{\alpha}$, and +15.5% in $%{\Delta}J_L$ for E-J characteristics under a stress state of 0.90 $E_{1\;mA/120^{\circ}C$ /24 h. Furthermore, it exhibited $%{\Delta}{\varepsilon}_{APP}$' of -0.7% and $%{\Delta}tan{\delta}$ of +5.7% for dielectric characteristics under the same stress state.

Big Data Analysis and Prediction of Traffic in Los Angeles

  • Dauletbak, Dalyapraz;Woo, Jongwook
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.14 no.2
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    • pp.841-854
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    • 2020
  • The paper explains the method to process, analyze and predict traffic patterns in Los Angeles county using Big Data and Machine Learning. The dataset is used from a popular navigating platform in the USA, which tracks information on the road using connected users' devices and also collects reports shared by the users through the app. The dataset mainly consists of information about traffic jams and traffic incidents reported by users, such as road closure, hazards, accidents. The major contribution of this paper is to give a clear view of how the large-scale road traffic data can be stored and processed using the Big Data system - Hadoop and its ecosystem (Hive). In addition, analysis is explained with the help of visuals using Business Intelligence and prediction with classification machine learning model on the sampled traffic data is presented using Azure ML. The process of modeling, as well as results, are interpreted using metrics: accuracy, precision and recall.

Design and Implement of Secure helper using Smart-phone Auto recording App (스마트폰 자동 녹음 앱을 이용한 생활 안전 도우미 설계 및 구현)

  • Moon, Jeong-Kyung;Hwang, Deuk-Young;Kim, Jin-Mook
    • Convergence Security Journal
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    • v.15 no.7
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    • pp.111-118
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    • 2015
  • The violent crime has increased dramatically in our society. This is because our society has to change quickly. Strong police force, but this is not enough to solve the crime. And there are a lot of police to investigate the situation difficult to go out to the crime scene. So inevitably increase in the risk of crime. Researchers have conducted a number of studies to solve this problem. However, the proposed study how realistic are many points still lacking. herefore, we to take advantage of smartphones and high-speed Internet access technology to provide security services using the push service for rapid identification and crime situation in this study. Therefore, we would like to provide rapid service to identify criminal security situation using smart-phone app and push services on the high speed internet environments. The proposed system is to record the voice information received from the smart phone near the user presses the hot key is set in advance in real-time, and stores the audio information stored in the LBS information to the server through the authentication procedure. And the server uses the stored voice data and LBS Push service information to inform their families. We have completed the design of the proposed system. And it has implemented a smart phone app, the user authentication server. And using the state in which the push service from the authentication server by transmitting a message to a user to inform a family. But more must examine whether the proposed research is relevant in future studies.