Gu-Min Jeong

Kookmin University, Sŏul, Seoul, South Korea

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Publications (56)11.92 Total impact

  • Source
    Sang-Il Choi, Gu-Min Jeong
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    ABSTRACT: We present a composite vector selection method for an effective electronic nose system that performs well even in noisy environments. Each composite vector generated from a electronic nose data sample is evaluated by computing the discriminant distance. By quantitatively measuring the amount of discriminative information in each composite vector, composite vectors containing informative variables can be distinguished and the final composite features for odor classification are extracted using the selected composite vectors. Using the only informative composite vectors can be also helpful to extract better composite features instead of using all the generated composite vectors. Experimental results with different volatile organic compound data show that the proposed system has good classification performance even in a noisy environment compared to other methods.
    Sensors 01/2014; 14(4):6938-51. · 2.05 Impact Factor
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    ABSTRACT: In this paper, we present the design of an advanced course on mobile embedded software, especially focused on Android programming for various embedded system applications. With the popularity of smartphone applications, there are numerous books and classes for smartphone programming. However, fast growing mobile technologies have led to a huge gap between advances in industry and university educational programs. Furthermore, trends in device convergence based on smartphones necessitate a broadened and diversified treatment of application domains such as automotive embedded systems and smart robots. Consequently, an advanced project course in mobile embedded software requires a complete redesign of its contents to meet these multiple goals. We describe our experience in redesigning an Android programming course to satisfy both the fundamental educational needs and industry trends. Based on the proposed design, we offered a successful course, "CS 190: Mobile Embedded SW with Android" at UC Irvine in Spring Quarter 2012, and describe our experience with the offering.
    Proceedings of the Workshop on Embedded and Cyber-Physical Systems Education; 10/2012
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    ABSTRACT: We propose a pixel selection method in a face image based on discriminant features for face recognition. By analyzing the relationship between the pixels in face images and features extracted from them, the pixels that contain a large amount of discriminative information are selected, while the pixels with less discriminative information are discarded. The experimental results obtained with various face databases show that the proposed pixel selection method results in improved recognition performance, especially in the presence of illumination or facial expression variations. Additionally, the proposed method greatly reduces the memory size and computational load in the face recognition process.
    Pattern Recognition Letters 07/2012; 33(9):1083–1092. · 1.27 Impact Factor
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    ABSTRACT: In this paper, we propose a WPAN (Wireless Personal Area Net-work) platform for converged network services integrating a cellular network and a WPAN. We mainly focus on an easy-to-develop and easy-to-use WPAN platform for wireless communication services using both networks. The pro-posed WPAN platform consists of a WPAN handset platform, a WPAN con-nection scheme, and a WPAN server platform. The WPAN handset platform provides abstract WPAN API (Application Programming Interface) set and ap-plication management module. Using the WPAN connection scheme, the user can enjoy converged network services in a convenient way. The WPAN server platform manages the overall services and digital devices that are connected to the handset. Compared to the existing WPAN related platform, we consider the need for the integrated service components allowing for the development of WPAN applications in the handset and their convenience for the user. Also, illustrative services and devices are implemented using the proposed method, which show the applicability of the proposed WPAN platform.
    Int. J. of Computers. 04/2012; VII:73-89.
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    Sang-Il Choi, Gu-Min Jeong, Chunghoon Kim
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    ABSTRACT: We present an effective portable e-nose system that performs well even in noisy environments. Considering the characteristics of the e-nose data, we use an image covariance matrix-based method for extracting discriminant features for vapor classification. To construct composite vectors, primitive variables of the data measured by a sensor array are rearranged. Then, composite features are extracted by utilizing the information about the statistical dependency among multiple primitive variables, and a classifier for vapor classification is designed with these composite features. Experimental results with different volatile organic compounds data show that the proposed system has better classification performance than other methods in a noisy environment.
    Sensors 01/2012; 12(12):16182-93. · 2.05 Impact Factor
  • Gu-Min Jeong, Chanwoo Moon, Hyun-Sik Ahn
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    ABSTRACT: This letter investigates an iterative learning control with advanced output data (ADILC) scheme for non-minimum phase (NMP) systems when the number of NMP zeros is unknown. ADILC has a simple learning structure that can be applied to both minimum phase and NMP systems. However, in the latter case, it is assumed that the number of NMP zeros is already known. In this paper, we propose an ADILC scheme in which the number of NMP zeros is unknown. Based on input-to-output mapping, the learning starts from the relative degree. When the input becomes larger than a certain upper bound, we redesign the input update law which consists of the relative degree and the estimated value for the number of NMP zeros.
    IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences 01/2012; E95.A(8):1416-1419. · 0.24 Impact Factor
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    ABSTRACT: This paper presents the paradigm shift and the state of the art of LBS(Location Based Service) in the recent mobile environment. The advent of smartphone, especially, HW(Hardware) for localization, the middleware for LBS and map DB(Database), leads a big step towards LBS as a killer application. The LBS grows very fast with various smartphone applications. In feature phone, the service area of LBS was limited and the main usage was finding buddy. However, in smartphone, LBS merges other killer applications such as SNS(Social Network Service), AR(Augmented Reality), game, mobile commerce and so on. The abrupt evolution of technology and service requires appropriate laws and systems for the future development. KeywordsLBS–Smartphone–Platform–Applications
    10/2011: pages 251-258;
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    ABSTRACT: This paper improves the performance of Feature Feedback and presents its application to face recognition. Feature Feedback has been introduced as a method which focuses on preprocessing the input data before classification. After extracting the features from original, Feature Feedback identifies the important part of the original data through the reverse mapping from the extracted features to the original space. In the feature extraction step, original feature feedback used PCA before LDA to avoid the small sample size problem but it has been shown that this may cause loss of significant discriminatory information. To overcome that problem, in the proposed method, we introduce feature feedback using regularized Fisher's separability criterion to extract the features and apply it to face recognition using the Yale data. The experimental results show that the proposed method works well.
    Convergence and Hybrid Information Technology - 5th International Conference, ICHIT 2011, Daejeon, Korea, September 22-24, 2011. Proceedings; 01/2011
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    ABSTRACT: In this paper, we propose a method of analyzing vibration sensor data for smartphone camera applications and apply it to the smartphone. Vibration is one of the main features influencing the quality of camera image. Based on these facts, we need a method to prevent the image-blurring phenomenon on a smart phone. In this paper, we have performed an analysis and reconstruction the data from installed sensor on the smart phone in order to compute accurate vibration values. An implementation of smartphone application shows the validity and applicability of the proposed method for assisting smartphone camera function.
    ICT Convergence (ICTC), 2011 International Conference on; 01/2011
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    ABSTRACT: In this paper, we present a control system allowing users to control R-Learning robot using Android smart phone. The presented control system consists of an application for Android smartphone and an application embedded in R-Learning robot. Two important roles of this system are assuring safety and working as an assistant. Therefore, if smartphone is used with R-Leaning, we can provide more functions to teachers and students and it will be helpful to the learning. Technically, when robot using smartphone, the program embedded in robot will receive related information and control values from smart phone and move robot to desired position. Also, the smartphone displays the related information to the teacher different from that of robot.
    ICT Convergence (ICTC), 2011 International Conference on; 01/2011
  • Sang-Il Choi, Gu-Min Jeong
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    ABSTRACT: Shadows that occur on face images due to illumination variation can change the appearance of a face and degrade face recognition performance. In this paper, we propose a new shadow compensation method based on the Fourier analysis for handling illumination variation. The face image deteriorated by shadow is restored by using the auxiliary magnitude, which compensates for the magnitude of the Fourier transform distorted due to the illumination variation. The experimental results for the CMU-PIE and Yale B databases show that the proposed method results in improved recognition performance under illumination variation.
    IEEE Signal Processing Letters 01/2011; 18:23-26. · 1.67 Impact Factor
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    ABSTRACT: In this paper, we propose and implement the automated brightness control system using distance measuring sensor for reducing the power consumption of emotional lighting device. In order to reduce the power consumption of emotional lighting devices which express continuous color changes, the proposed device measures the distance continuously using ultrasonic sensor and by using this, it also performs PWM Dimming control. The lighting device is composed of micro controller, LED driver, ultrasonic sensor, communication module and so on. And the device performs the real time brightness control by adapting the measured distance information from ultrasonic sensor to PWM signals. From this experiment, we implement the active lighting system which minimizes unnecessary power consumption during user's absence by adapting existing energy reducing techniques.
    The Journal of the Institute of Webcasting, Internet and Telecommunication. 01/2011; 11(6).
  • Multimedia, Computer Graphics and Broadcasting - International Conference, MulGraB 2011, Held as Part of the Future Generation Information Technology Conference, FGIT 2011, in Conjunction with GDC 2011, Jeju Island, Korea, December 8-10, 2011. Proceedings, Part I; 01/2011
  • Multimedia, Computer Graphics and Broadcasting - International Conference, MulGraB 2011, Held as Part of the Future Generation Information Technology Conference, FGIT 2011, in Conjunction with GDC 2011, Jeju Island, Korea, December 8-10, 2011. Proceedings, Part II; 01/2011
  • Multimedia, Computer Graphics and Broadcasting - International Conference, MulGraB 2011, Held as Part of the Future Generation Information Technology Conference, FGIT 2011, in Conjunction with GDC 2011, Jeju Island, Korea, December 8-10, 2011. Proceedings, Part I; 01/2011
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    ABSTRACT: In this paper, we introduce a control algorithm for robot simulator in educational platform. This platform is used to execute and check contents which are used for English education, making it more convenient for content developers. When the educational contents are executed, control values in contents are sent to the robot simulator to control its motion. In addition, robot motion can be controlled directly from the platform manually. Also, a PID controller is used to improve the performance of robot simulator.
    ICT Convergence (ICTC), 2011 International Conference on; 01/2011
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    ABSTRACT: Recently, bluetooth technology has become widely prevalent so that many laptops and mobile phones are equipped with bluetooth capability. In order to meet the increasing demand to interconnect these devices a new scatternet formation protocol named GBSFP (General Bluetooth Scatternet Formation Protocol) is proposed in this paper. GBSFP is the result of efforts to overcome the two major limitations of the legacy scatternet formation protocols as regards their real implementation, that all of the nodes should be within the Bluetooth communication range or that they should be time synchronized. In GBSFP, a node goes through three phases; 1) the Init phase to establish a bluetooth link to as many of its neighbors as possible, 2) the Ready phase to determine the role of each node, i.e., master or slave, and remove any unnecessary bluetooth links, and 3) the Complete phase to finalize the formation of the scatternet and begin data transmission. The simulation results show that GBSFP provides higher connectivity in many scenarios compared with BTCP and BlueStars.
    IEICE Transactions. 01/2010; 93-B:40-46.
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    ABSTRACT: We propose a data refinement and channel selection method for vapor classification in a portable e-nose system. For the robust e-nose system in a real environment, we propose to reduce the noise in the data measured by sensor arrays and distinguish the important part in the data by the use of feature feedback. Experimental results on different volatile organic compounds data show that the proposed data refinement method gives good clustering for different classes and improves the classification performance. Also, we design a new sensor array that consists only of the useful channels. For this purpose, each channel is evaluated by measuring its discriminative power based on the feature mask used in the data refinement. Through the experimental results, we show that the new sensor array improves both the classification rates and the efficiency in computation and data storage.
    Sensors 01/2010; 10(11):10387-400. · 2.05 Impact Factor
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    ABSTRACT: In this paper, we propose a new pattern recognition method using feature feedback and present its application to face recognition. Conventional pattern recognition methods extract the features employed for classification using PCA, LDA and so on. On the other hand, in the proposed method, the extracted features are analyzed in the original space using feature feedback. Using reverse mapping from the extracted features to the original space, we can identify the important part of the original data that affects the classification. In this way, we can modify the data to obtain a higher classification rate, make it more compact or abbreviate the required sensors. To verify the applicability of the proposed method, we apply it to face recognition using the Yale Face Database. Each face image is divided into two parts, the important part and unimportant part, using feature feedback, and the classification performed using the feature mask obtained from feature feedback. Also, we combine face recognition with image compression. The experimental results show that the proposed method works well. KeywordsFeature feedback-feature extraction-face recognition-feature mask-region differential JPEG compression
    International Journal of Control Automation and Systems 01/2010; 8(1):141-148. · 0.95 Impact Factor
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    ABSTRACT: In this paper, we analyze and simulate the capacity of Bluetooth AP (Access Point) for LBS (Location Based Service) with mobile phones and Bluetooth. Based on the modeling of connection setup times and data transmission times, we derive the capacity model of Bluetooth AP. Moreover, we consider content size and the statistics of incoming users for the simulation. From the simulation, we derive the possible number of users with capacity of the given Bluetooth AP in order to utilize the results in the real application environment.
    The Journal of the Institute of Webcasting, Internet and Telecommunication. 01/2010; 10(5).

Publication Stats

47 Citations
11.92 Total Impact Points

Institutions

  • 2005–2012
    • Kookmin University
      • • School of Electrical Engineering
      • • College of Electrical Engineering and Computer Science
      Sŏul, Seoul, South Korea
  • 2010–2011
    • Seoul National University
      • • School of Electrical Engineering and Computer Sciences
      • • School of Computer Science and Engineering
      Sŏul, Seoul, South Korea