• Journal of information and communication convergence engineering
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• v.9 no.2
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• pp.212-216
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• 2011

Digital watermarking has gained importance in recent years in copyright protection and multimedia. This paper proposes a secure and novel watermarking system based on complemented Maximum Length Cellular Automata (MLCA) and Two-Dimension Cellular Automata Transform (2D CAT). In this watermarking scheme, the original watermark is first encrypted by complemented MLCA with the private keys, and then the encrypted watermark is embedded into the CAT domain of the cover image, at last use the inverse CAT for the transformed image, the watermarked image is obtained. Experiment results show that this new method is more secure and provides robust performance against watermarking attacks.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.11
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• pp.2375-2380
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• 1997

The need for developing effective coding techniques for various multimedia services is increasing in order to meet the demand for image data. In this paper, a zeroblock coding algorithm is proposed for progressive transmission of images. The zeroblock coding algorithm is constructed as an embedded coding so that the encoding and decoding process can be terminated at any point and allowing reasonable image quality. Some features of zeroblock coding algorithm are 1) coding of subband images by prediction of the insignificance of blocks across subband leels, 2) aset of sate transition rules for representing the significance map of blocks, and 3) block coding by vector quantization using a multiband codebook consisting of several subcodebooks dedicated for each subband at a given threshold.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.931-934
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• 2007

멀티미디어 디스플레이 시장현황과 성장추이를 보면 현재 멀티미디어 디스플레이는 '진화 중'이라는 표현이 적당할 것으로 보인다. 다양한 종류의 시스템을 인식시키기 위한 호환성이 개선됐고 네트워크 기능 까지 추가 되는 등 계속해서 여러 가지 기술이 응집되고 있다. 무선 랜은 랜 케이블이 없어도 되기 때문에 케이블 연결을 최소화해야 하는 멀티미디어 디스플레이에 필요한 요소이다. 본 논문에서는 IEEE 802.11g wireless mini pci를 탑재한 ARM계열 임베디드 장비에서 C/C++를 사용하여 보다 효율적이고 뛰어난 uClinux기반의 멀티미디어 디스플레이 무선 랜 네트워크 사용자 인터페이스의 구현에 대해서 논의 하고자 한다.

• Proceedings of the Korea Society for Simulation Conference
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• 2002.05a
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• pp.249-252
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• 2002

IEEE 802.11의 매체 접근 제어 MAC 프로토콜은 두가지 운영 방법을 제공한다. 하나는 실시간 응용 서비스가 아닌 데이터를 지원하기 위한 임의 접근 (random access)모드이고 다른 하나는 실시간 응용 서비스를 지원하기 위한 폴링 (polling) 모드이다. 폴링 모드는 PCF (Point Coordination Function) 라 불리우는 비경쟁 (non contention) 방식의 MAC 프로토콜이다. PCF 는 노드의 지연 (delay)의 증가와 처리율(throughput) 의 감소가 가장 큰 문제가 된다. 처리율 향상을 위해 ERR (Embedded Round Robin) 방식이 제안되었다. 그러나 ERR은 노드의 지연이 여전히 문제로 남아있다. 본 논문에서는 노드의 지연과 처리율을 동시에 향상시킬 수 있는 QRR (Request Round Robin)을 제안한다. 시뮬레이션에 의하여 제안한 QRR 이 ERR보다 성능향상이 됨을 보인다.

• International Journal of Internet, Broadcasting and Communication
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• v.4 no.2
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• pp.12-16
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• 2012

This paper presents a learning framework that fits the digital age - an e-Friendly PLE. The learning framework is based on the theory of connectivism which asserts that knowledge and the learning of knowledge is distributive and is not located in any given place but rather consists of the network of connections formed from experiences and interactions with a knowing community, thus, the newly empowered learner is thinking and interacting in new ways. The framework's approach to learning is based on conversation and interaction, on sharing, creation and participation, on learning not as a separate activity, but rather as embedded in meaningful activities such as games or workflows. It sees learning as an active, personal inquiry, interpretation, and construction of meaning from prior knowledge and experience with one's actual environment.

• Proceedings of the IEEK Conference
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• 2000.11b
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• pp.349-352
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• 2000

In this paper, a SIMD 64bit MAC (Multiply -Accumulate) unit is designed. It is composed of two 32bit MAC unit which supports SIMD 16bit operations. As a result, It can process two 32bit MAC operations or four 16bit operations in one cycle. Proposed MAC unit is described in Verilog HDL. After functional verification is performed, MAC unit is synthesized and optimized with 0.35$\mu\textrm{m}$ standard cell library. The synthesis result shows that this MAC unit can operate at 80㎒ of clock frequency in 85$^{\circ}C$, 3.0V, worst case process and 125㎒ of clock frequency at 25$^{\circ}C$, 3.3V, typical case process. It achieves 320Mops of performance, and is suitable for embedded DSP processors.

• Proceedings of the IEEK Conference
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• 2003.07e
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• pp.2363-2366
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• 2003

With the increasing use of multimedia technologies, image compression requires higher performance as well as new features such as embedded Tossy to lossless coding, various progressive order, error resilience and region-of-interest coding. In the specific area of still image encoding, a new standard, the JPEG2000, has been currently developed. This paper presents a new compression scheme based on JPEG2000. In the proposed scheme, gray coding is applied to the wavelet coefficient. Since gray coding produces an image whose bit plane is will clustered. The proposed method improves compression efficiency of the JPEG2000.

• Journal of Korea Society of Industrial Information Systems
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• v.19 no.2
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• pp.51-58
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• 2014

As WSNs(Wireless Sensor Networks) are being deployed widely in diverse application areas, their management and maintenance become more important. Recent sensor node software takes modular software architectures in pursuit of flexible software management and energy efficient reprogramming. To realize an flexible and efficient modular architecture particularly on resource constrained mote-class sensor nodes that are implemented with MCUs(Micro-Controller Units) of a single address space. an appropriate module linking model is essential to resolve and bind the inter-module global symbols. This paper identifies a design space of module linking model and respectively their implementation frameworks. We then establish a taxonomy for module linking models by exploring the design space of module linking models. Finally, we suggest an implementation framework respectively for each module linking model in the taxonomy. We expect that this work lays the foundations for systematic innovation toward more flexible and efficient modular software architectures for WSNs.

• Journal of the Semiconductor & Display Technology
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• v.7 no.4
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• pp.57-62
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• 2008

Image retrieval is one of the most exciting and rapidly growing research issues in the field of multimedia technology. This paper proposes a new method that performs search the relevant images by using query-by-example. The proposed method for search and retrieval of images utilizes the location information where the image had been taken. The system associates the photo images with their corresponding GPS coordinates that are used as metadata for searching. Experimental results show that the proposed method demonstrates better performance improving up to 59% of average recall and 49% of average precision. Moreover, we learned from the experimental results geo-location information embedded within the image header is more effective and positive on the search and storage.

• Journal of the Korea Society of Computer and Information
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• v.21 no.2
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• pp.17-23
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• 2016

NUI is a motion interface. It uses the body of the user without the use of HID device such as a mouse and keyboard to control the device. In this paper, we use a Pi Camera and sensors connected to it with small embedded board Raspberry Pi. We are using the OpenCV algorithms optimized for image recognition and computer vision compared with traditional HID equipment and to implement a more human-friendly and intuitive interface NUI devices. comparison operation detects motion, it proposed a more advanced motion sensors and recognition systems fused connected to the Raspberry Pi.