• Journal of the Korea Society of Computer and Information
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• v.16 no.8
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• pp.119-128
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• 2011

This paper introduces design space exploration of many-core processors that meet high performance and low power required by the beamforming algorithm of image signals of mobile ultrasound. For the design space exploration of the many-core processor, we mapped different number of ultrasound image data to each processing element of many-core, and then determined an optimal many-core processor architecture in terms of execution time, energy efficiency and area efficiency. Experimental results indicate that PE=4096 and 1024 provide the highest energy efficiency and area efficiency, respectively. In addition, PE=4096 achieves 46x and 10x better than TI DSP C6416, which is widely used for ultrasound image devices, in terms of energy efficiency and area efficiency, respectively.

• Electronics and Telecommunications Trends
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• v.38 no.2
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• pp.36-45
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• 2023

Segment routing (SR) is a source-based routing architecture in which a node steers packets adhering to service and topological requirements. Using programmable segments, SR enables end-to-end service connectivity to satisfy the network constraints of various services. SR can be implemented with both MPLS and IPv6 dataplanes. This survey presents the overview of SR for IPv6 dataplane (SRv6), network programming technologies based on SRv6, and the SR deployment status.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.6
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• pp.521-530
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• 2013

This paper proposes a task parallelism system (BioMP) to improve applications' execution time of multicore based mobile device. When application developers append the functions of parallel specification into the existing software, our proposed system supports the parallel processing of threads as well as a compatibility. BioMP improves the software in order that an existing large-scale source can recognize the multicore architecture. From our experiment, our idea improved the execution time of application until about 64% against the existing system in multicore environment based on quad core. In addition, BioMP does not require any additional modification of a mobile platform because BioMP is independent component. Consequently, when application developers release multicore-aware applications into the application store, users can immediately run without any modification of the mobile device.

• Electronics and Telecommunications Trends
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• v.28 no.2
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• pp.1-10
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• 2013

1980년대와 1990년대가 서버와 데스크톱 중심 컴퓨팅의 시대였다고 한다면 2000년대 들어 모바일 분야를 포함하는 임베디드 프로세서 시장이 급격히 확장되며 임베디드 중심 시대로 산업구조가 재편되고 있다. 그리고, 2010년대에는 임베디드 프로세서 시장이 더욱 확대되고 기술도 더불어 발전되고 있는데, 최근 기술을 주도하고 있는 뜨거운 용어 중의 하나가 이기종 멀티코어 컴퓨팅이라 할 수 있다. 시장이 요구하는 고성능 컴퓨팅을 수용하고 임베디드 기기의 특성상 저전력을 실현해야 하는 현실적 문제를 해결하기 위한 이기종 멀티코어 하드웨어가 임베디드 기기에도 적용을 앞다투고 있는 상황이며, 적절한 응용 콘텐츠에 맞춰 이기종 멀티코어 하드웨어를 활용하기 위한 소프트웨어에 대한 관심과 발전도 발 맞춰 진행되고 있다. 이에 본고에서는 임베디드 기기 분야에 한정하여 이기종 멀티코어 하드웨어와 소프트웨어의 기술 동향을 살펴보고자 한다.

• The KIPS Transactions:PartA
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• v.18A no.2
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• pp.45-52
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• 2011

In the past, a patient went to the room where an ultrasound image diagnosis device was set, and then he or she was examined by a doctor. However, currently a doctor can go and examine the patient with a handheld ultrasound device who stays in a room. However, it was implemented with only fundamental functions, and can not meet the high performance required by the focusing algorithm of ultrasound beam which determines the quality of ultrasound image. In addition, low energy consumption was satisfied for the mobile ultrasound device. To satisfy these requirements, this paper proposes a high-performance and low-power single instruction, multiple data (SIMD) based multi-core processor that supports a representative beamforming algorithm out of several focusing methods of mobile ultrasound image signals. The proposed SIMD multi-core processor, which consists of 16 processing elements (PEs), satisfies the high-performance required by the beamforming algorithm by exploiting considerable data-level parallelism inherent in the echo image data of ultrasound. Experimental results showed that the proposed multi-core processor outperforms a commercial high-performance processor, TI DSP C6416, in terms of execution time (15.8 times better), energy efficiency (6.9 times better), and area efficiency (10 times better).

• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.12
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• pp.1914-1924
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• 2016

In this paper, considering virtualized Evolved Packet Core(vEPC) network for 5G mobile network, we propose architecture for supporting Service Function Chaining(SFC) in 5G mobile network. Using SFC in 5G network, dynamic path configuration and providing network services based on subscriber and traffic information. SFC technology provides logical ordered set of network functions and delivers packet through providing logical path over the physical network. Based on the perspective of 5G core network in distributed manner, we design hierarchical SFC architecture to manage SFC for global path including vEPC and SGi-LAN network, and internal path between virtualized network functions in each cloud. In this paper, we define architecture and call flow for establishing data path using SFC. Finally, we design testbed architecture for real implementation based on open source software.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.33-36
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• 2014

최근 스마트폰이나 태블릿 PC 등의 모바일 디바이스가 상용화 되어감에 따라 그 안에서 핵심적인 처리기능을 담당하는 프로세서의 코어 수가 점차적으로 늘어나고 있다. 많은 수의 코어를 효율적으로 사용하기 위해 여러 가지 메커니즘이 구현되어 있으나, 단일 프로세스를 순차적으로 실행하는 경우 여전히 성능에서의 한계가 존재한다. 병렬화 되어 있지 않은 프로세스의 경우, Amdahl's Law[1]에 따르면 순차적으로 실행을 할 수 밖에 없는 부분이 존재하고, 이 부분은 하나의 코어에서만 실행되기 때문에 많은 연산 자원들이 낭비되는 현상이 발생한다. 본 논문은 다중 코어 환경에서 이러한 잉여자원을 효과적으로 사용하기 위해 Back-end Fusion 이라는 구조를 제안하여 프로세서의 성능 향상을 위한 연구를 진행하였다. Back-end Fusion 이란, 연산 처리를 담당하는 back-end 부분(execution unit, writeback 단계 등)을 필요에 따라 코어 간에 동적으로 재구성하여 성능을 향상시키는 메커니즘이다. 이 재구성된 프로세서의 back-end 를 효율적으로 사용하기 위해, 종속성과 로드 밸런스 등을 고려한 인스트럭션 분배 알고리즘을 함께 제안한다. Intel 사의 x86 Instruction Set Architecture(ISA)를 기반으로 한 시뮬레이터를 이용하여 Back-end Fusion 프로세서의 성능을 측정 해 본 결과 기존의 단일 코어 프로세서에 비해 평균 32.2%의 성능 향상을 확인할 수 있었다.

• Proceedings of the Korea Contents Association Conference
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• 2014.11a
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• pp.25-26
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• 2014

스마트폰의 폭 넓은 보급으로 인해 스마트폰 시장은 급격한 성장을 이루었고, 모바일 환경의 발전은 다양한 형태의 애플리케이션의 개발과 모바일 게임 시장의 성장으로 이어졌다. 모바일 게임에서 사용자간 상호작용은 중요한 요소가 되었다. 하지만 대부분의 모바일 게임들은 소셜네트워크상의 초대와 아이템의 제공, 스코어 비교 등에 그치는 등 제한된 영역에서의 상호작용에 그치는 경향이 있다. 이에 본 논문에서는 메시지 서버를 활용하여 다수의 모바일 디바이스를 유기적으로 연계, 모바일 디바이스의 화면이나 기능을 확장하고 게임세계와 현실세계의 접목을 통한 새로운 형태의 게임 가능성에 대해 연구하였다.

• Journal of the Korea Society of Computer and Information
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• v.16 no.1
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• pp.1-9
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• 2011

Recently, as mobile multimedia devices are used more and more, the needs for high-performance and low-energy multimedia processors are increasing. Application-specific integrated circuits (ASIC) can meet the needed high performance for mobile multimedia, but they provide limited, if any, generality needed for various application requirements. DSP based systems can used for various types of applications due to their generality, but they require higher cost and energy consumption as well as less performance than ASICs. To solve this problem, this paper proposes a single instruction multiple data (SIMD) based many-core processor which supports high-performance and low-power image data processing while keeping generality. The proposed SIMD based many-core processor composed of 16 processing elements (PEs) exploits large data parallelism inherent in image data processing. Experimental results indicate that the proposed SIMD-based many-core processor higher performance (22 times better), energy efficiency (7 times better), and area efficiency (3 times better) than conversional commercial high-performance processors.

• Smart Media Journal
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• v.9 no.3
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• pp.71-79
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• 2020

Mobile network is used by many users worldwide for diverse services, including phone-call, messaging and data transfer over the Internet. However, this network may experience massive damage if it is exposed to cyber-attacks or denial-of-service attacks via wireless communication interference. Because the mobile network is also used as an emergency network in cases of disaster, evaluation or verification for security and safety is necessary as an important nation-wide asset. However, it is not easy to analyze the mobile core network because it's built and serviced by private service providers, exclusively operated, and there is even no separate network for testing. Thus, in this paper, a virtual mobile network is built using OpenAirInterface, which is implemented based on 3GPP standards and provided as an open source software, and the structure and protocols of the core network are analyzed. In particular, the S1AP protocol messages captured on S1-MME, the interface between the base station eNodeB and the mobility manager MME, are analyzed to identify potential security threats by evaluating the effect of the messages sent from the user terminal UE to the mobile core network.