• Title/Summary/Keyword: Embedded data

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Development of Traffic State Classification Technique (교통상황 분류를 위한 클러스터링 기법 개발)

  • Woojin Kang;Youngho Kim
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.22 no.1
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    • pp.81-92
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    • 2023
  • Traffic state classification is crucial for time-of-day (TOD) traffic signal control. This paper proposed a traffic state classification technique applying Deep-Embedded Clustering (DEC) method that uses a high dimensional traffic data observed at all signalized intersections in a traffic signal control sub area (SA). So far, signal timing plan has been determined based on the traffic data observed at the critical intersection in SA. The current method has a limitation that it cannot consider a comprehensive traffic situation in SA. The proposed method alleviates the curse of dimensionality and turns out to overcome the shortcomings of the current signal timing plan.

Development of the Embedded System-based Real-time Internal Status Identification System for Overhead Bin (임베디드 시스템 기반 오버헤드 빈 내부 상황 실시간 식별 시스템 개발)

  • Jaeeun Kim;Hyejung Lim;Sungwook Cho
    • Journal of Aerospace System Engineering
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    • v.17 no.2
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    • pp.111-119
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    • 2023
  • Internal storage state, weight data, and weight-centered calculation values for overhead bin can all be seen in this paper's real-time internal status identification system. The suggested system offers such valuable data via a range of sensors, including load cells and switch arrays. The proposed system could locate internal free space, locate the center of gravity, and give real-time visual information. It was developed utilizing an embedded system and the C programming language. These features led to the creation of smart overhead bins and real-time cargo loading monitoring technologies, both of which could one day aid in the creation of a cargo loading automation system.

Dual Image Reversible Data Hiding Scheme Based on Secret Sharing to Increase Secret Data Embedding Capacity (비밀자료 삽입용량을 증가시키기 위한 비밀 공유 기반의 이중 이미지 가역 정보은닉 기법)

  • Kim, Pyung Han;Ryu, Kwan-Woo
    • Journal of Korea Multimedia Society
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    • v.25 no.9
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    • pp.1291-1306
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    • 2022
  • The dual image-based reversible data hiding scheme embeds secret data into two images to increase the embedding capacity of secret data. The dual image-based reversible data hiding scheme can transmit a lot of secret data. Therefore, various schemes have been proposed until recently. In 2021, Chen and Hong proposed a dual image-based reversible data hiding scheme that embeds a large amount of secret data using a reference matrix, secret data, and bit values. However, in this paper, more secret data can be embedded than Chen and Hong's scheme. To achieve this goal, the proposed scheme generates polynomials and shared values using secret sharing scheme, and embeds secret data using reference matrix and septenary number, and random value. Experimental results show that the proposed scheme can transmit more secret data to the receiver while maintaining the image quality similar to other dual image-based reversible data hiding schemes.

Development of a Real-time Error-detection System;The Case study of an Electronic Jacquard

  • Huh, Jae-Yeong;Seo, Chang-Jun
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.2588-2593
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    • 2003
  • Any system has the possibility of an error occurrence. Even if trivial errors were occurred, the original system would be fatally affected by the occurring errors. Accordingly, the error detection must be demanded. In this paper, we developed a real-time error detection system would be able to apply to an electronic Jacquard system. A Jacquard is a machine, which controls warps while weaving textiles, for manufacturing patterned cloth. There are two types of mechanical and electronic Jacquard. An electronic Jacquard is better than a mechanical Jacquard in view of the productivity and realizability for weaving various cloths. Recent weaving industry is growing up increasingly due to the electronic Jacquard. But, the problem of wrong weaving from error data exists in the electronic Jacquard. In this research, a real-time error detection system for an electronic Jacquard is developed for detecting errors in an electronic Jacquard in real-time. The real-time system is constructed using PC-based embedded system architecture. The system detects the occurring errors in real-time by storing 1344 data transferred in serial from an electronic Jacquard into memory, and then by comparing synchronously 1344 data stored into memory with 1344 data in a design file before the next data would be transferred to the Jacquard for weaving. The information of detected errors are monitored to the screen and stored into a file in real-time as the outputs of the system. In this research, we solve the problem of wrong weaving through checking the weaving data and detecting the occurred errors of an electronic Jacquard in real-time.

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Digital Image Watermarking using Inner Product and Adaptive Quantization (내적과 적응성 양자화를 이용한 디지털 영상의 워터마킹 방법)

  • 이승욱;김진호;호요성
    • Journal of Broadcast Engineering
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    • v.6 no.1
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    • pp.50-57
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    • 2001
  • A digital watermarking is a newly developed scheme to embed invisible or inaudible information Into the host data in order to insist the copyright of the owner or the creator. This paper describes a robust data embedding scheme that employs inner product and adaptive quantization. Compared to the previous works for digital watermarking, our proposed scheme can embed relatively large amount of Information, since a secrete key Is not directly relaxed to the watermark data. A secret key is used for the design of random direction vectors. which are taken Inner product with the DCT transformed feature set data. In odder to achieve robustness against malicious attacks. we exploit the Properties of human visual system In designing the random direction vectors which behave as embedded noises. Experimental results show that we can recover the embedded information without utilizing the original host data. We also demonstrate that the ownership assertion is possible even though The watermarked data may undergo common signal processing operations, such as JPEG compression. clopping. and filtering.

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Efficient Generation of a Feature Profile in a Set of Similar Video Data (유사 비디오 데이터 집합에서 효율적인 특성정보 프로파일 생성 기법)

  • Park Dong Cheol;Chang Joong-Hyuk;Lee Won-Suk
    • The KIPS Transactions:PartD
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    • v.12D no.2 s.98
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    • pp.219-232
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    • 2005
  • With the rapid progress of computer technology in recent years, a digital video data has been used in many applications. As a result, various technologies have been introduced to discover knowledge embedded in a video database. However, few researches on data mining for a video database have been performed due to the unclear boundary of the information in a large amount of a video stream. This paper proposes an efficient generation method of a feature profile in a set of similar video data. To extract the information embedded in original video data efficiently, several refinement techniques are also presented. These methods include merging pixels, restricting preferred areas, removing noises under a minimum repeat factor, extracting important key frames, generating derived blocks and applying weights to dynamic and static areas differently. Finally, the performance of these methods is evaluated by comparing a result profile obtained by a data mining process with original video streams.

Fixed Time Synchronous IPC in Zephyr Kernel (Zephyr 커널에서 고정 시간 동기식 IPC 구현)

  • Jung, Jooyoung;Kim, Eunyoung;Shin, Dongha
    • IEMEK Journal of Embedded Systems and Applications
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    • v.12 no.4
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    • pp.205-212
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    • 2017
  • Linux Foundation has announced a real-time kernel, called Zephyr, for IoT applications recently. Zephyr kernel provides synchronous and asynchronous IPC for data communication between threads. Synchronous IPC is useful for programming multi-threads that need to be executed synchronously, since the sender thread is blocked until the data is delivered to the receiver thread and the completion of data transfer can be known to two threads. In general, 'IPC execution time' is defined as the time duration between the sender thread sends data and the receiver thread receives the data sent. Especially, it is important that 'IPC execution time' in the synchronous IPC should be fixed in real-time kernel like Zephyr. However, we have found that the execution time of the synchronous IPC in Zephyr kernel increases in proportion to the number of threads executing in the kernel. In this paper, we propose a method to implement a fixed time synchronous IPC in Zephyr kernel using Direct Thread Switching(DTS) technique. Using the technique, the receiver thread executes directly after the sender thread sends a data during the remaining time slice of the sender thread and we can archive a fixed IPC execution time even when the number of threads executing in the kernel increases. In this paper, we implemented synchronous IPC using DTS in the Zephyr kernel and found the IPC execution time of the IPC is always 389 cycle that is relatively small and fixed.

Reliability Evaluation of Extrapolated Failure Load of Drilled Shafts Embedded in Weathered Rock (풍화암에 근입된 현장타설말뚝의 외삽 파괴하중 신뢰성 분석)

  • Jung, Sung-Jun;Lee, Sang-Inn;Jeon, Jong-Woo;Kim, Myoung-Mo
    • Proceedings of the Korean Geotechical Society Conference
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    • 2009.09a
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    • pp.993-1000
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    • 2009
  • In general, a drilled shaft embedded in weathered rock has a large load bearing capacity. Therefore, most of the load tests are performed only up to the load level that confirms the pile design load capacity, and stopped much before the failure load of the pile is attained. If a reliable failure load value can be extracted from the premature load test data, it will be possible to greatly improve economic efficiency as well as pile design quality. The main purpose of this study is to propose a standard for judging the reliability of the failure load of piles that is obtained from extrapolated load test data. To this aim, eleven static load test data of load-displacement curves were obtained from testing of piles to their failures from 3 different field sites. For each load-displacement curve, loading was assumed as 25%, 50%, 60%, 70%, 80%, and 90% of the actual pile bearing capacity. The limited known data were then extrapolated using the hyperbolic function, and the failure load was re-determined for each extrapolated data by the ASCE 20-96 method (1997). Statistical analysis was performed on the reliability of the re-evaluated failure loads. The results showed that if the ratio of the maximum-available displacement to the failure-load displacement exceeds 0.6, the extrapolated failure load may be regarded as reliable, having less than a conservative 20% error on average. The applicability of the proposed standard of judgment was also verified with static load test data of driven piles.

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Development of a Kit for Realtime transmission of data acquired by Earthquake accelerometers (지진가속도 계측기의 실시간 자료 전송 Kit 개발)

  • Heo, Jeongpil;Kim, Kiseog;Lim, Inseub;Jin, Jocheol
    • Journal of the Society of Disaster Information
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    • v.10 no.2
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    • pp.254-262
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    • 2014
  • KISStool is developed and established by KIGAM, in order to link and share the earthquake data easily with institutes related, this study includes the development of a KISStool program format and protocol supporting Kit. The Kit has functions such as transforming and sending a seismic data. The functions of the kit are implemented in modules, which are running on the realtime basis. The firmware is embedded into the Kit, which transforms the seismic data into the formats, miniSEED and QSCD20. These data are sent to KISStool program. We have confirmed the results of the data transforming, transmissions and storage functions are conducted normally, the speed of transmission shows same level when comparing with a standard system. We expect that the firmware developed in this study will have high usability not only for linking with KISStool program through being embedded into incompatible digitizers, but also for improving performance of older ones.

An Area Efficient Low Power Data Cache for Multimedia Embedded Systems (멀티미디어 내장형 시스템을 위한 저전력 데이터 캐쉬 설계)

  • Kim Cheong-Ghil;Kim Shin-Dug
    • The KIPS Transactions:PartA
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    • v.13A no.2 s.99
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    • pp.101-110
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    • 2006
  • One of the most effective ways to improve cache performance is to exploit both temporal and spatial locality given by any program executional characteristics. This paper proposes a data cache with small space for low power but high performance on multimedia applications. The basic architecture is a split-cache consisting of a direct-mapped cache with small block sire and a fully-associative buffer with large block size. To overcome the disadvantage of small cache space, two mechanisms are enhanced by considering operational behaviors of multimedia applications: an adaptive multi-block prefetching to initiate various fetch sizes and an efficient block filtering to remove rarely reused data. The simulations on MediaBench show that the proposed 5KB-cache can provide equivalent performance and reduce energy consumption up to 40% as compared with 16KB 4-way set associative cache.