Jeonghun Cho

POSEIDON: A framework for application-specific Network-on-Chip synthesis for heterogeneous chip multiprocessors

In recent years, the rise in the number of cores being integrated on a single chip has led to a greater emphasis on scalable communication fabrics that can overcome data transfer bottlenecks. Network-on-Chip (NoC) architectures have been gaining widespread acceptance as communication backbones for multi-core systems, due to their high scalability, predictability, and performance. However, NoCs are also power hungry, and synthesizing a NoC fabric for a particular application requires solving a multitude of non-trivial design problems. Due to the large design space associated with various possible NoC configurations and design constraints, it is critical to automate the exploration process and arrive at a customized NoC that meets performance goals, while minimizing power and peak temperature. In this paper, we present a novel application specific NoC synthesis framework (POSEIDON) that combines multiple algorithms and heuristics to efficiently explore the solution space. Our results indicate that the proposed framework provides a reduction of up to 15.7% in power consumption, 21.08% in average latency, 27.05% in total energy, and 42.7% in energy-delay product compared to state-of-the-art approaches, as well as a 4.2% reduction in peak temperature when the framework is customized for thermal-aware synthesis.

The Trend of the Security Research for the Insider Cyber Threat

In this paper, we discuss an insider security which has been one of the biggest issues in the network security. By surveying and analyzing an issue of previous studies, we suggest an effective approach for future research. Approximately 90% of the information leakage incidents are recently being performed by internal workers. It is coming as a more serious problem than outsider attacks. The information leakage incident makes an organization or a company not only loses information but also gives a hard blow to the image. To prevent economic loss and damage to the image in advance, we need various research and development for effective solution.

Implementation of the personal healthcare services on automotive environments

One of the main purposes of personal healthcare devices is for elderly people with chronic illness that needs a health monitoring continuously in common life. There are several standard specifications for personal healthcare devices to interact each other safely and compatibly. Depending on evolution of technology, the elderly and the chronic disease can have their own personal healthcare devices, and they can monitor themselves easily. However, some kind of limitation is still remaining in their life even if they have powerful smart devices. In situation that they need to drive and go to get treatment and to prepare medicine, automotive system does not support interfaces for personal healthcare devices. Therefore, we discuss about several standards of the personal healthcare devices and interfaces for connection of personal healthcare device. Also, automotive environments that include various network interfaces for infotainment and interconnection between infotainment system and devices and platform are considered. After that, we propose several implementations of personal healthcare services to support standard of personal healthcare devices on automotive system.

A Study on Implementation of IVI Applications for Connected Vehicle Using HTML5

Applications and networking are the key functions for connected vehicle. And applications of In-Vehicle Infotainment (IVI) system are one of the important characteristics in the automotive industry. Because of the fast evolution of electronic technologies, automotive industry cannot adopt new technology easily. IVI platform standard was developed by automotive OEM and suppliers but the problems still exist. In this paper, we propose an implementation technique of applications that are based on HTML5 and a simple way to access the mobile network. XML-based configuration is used to represent the capability of the vehicle, IVN signals of the production vehicle is used to validate the interaction between IVI system and vehicle. The application works well with native application APIs and HTML5 APIs as well as interact with vehicle and mobile network.

A new addressing mode for the encoding space problem on embedded processors

The complexity of todays applications increases with various requirements such as execution time, code size or power consumption. To satisfy these requirements for performance, efficient instruction set design is one of the important issues because an instruction customized for specific applications can make better performance than multiple instructions in aspect of fast execution time, decrease of code size, and low power consumption. Limited encoding space, however, does not allow adding application-specific and complex instructions freely to our instruction set architecture. To resolve this problem, conventional architectures increases free space for encoding by trimming excessive bits required beyond the fixed word length. This approach however shows weakness in terms of the complexity of compiler, code size and execution time. In this paper, we propose a new instruction encoding scheme based on the dynamic implied addressing mode (DIAM) to resolve limited encoding space and side-effect by trimming. Our DIAM-based approach uses a special program memory to store extra encoding information. We also suggest a code generation algorithm to fully utilize the DIAM. In our experiment, the architecture augmented with DIAMs shows about 10% code size reduction and speed up on average, as compared to the base architecture without DIAMs.

Advanced verification on WBAN and cloud computing for u-health environment

The Wireless Body Area Network (WBAN) that can collect measured vital signs through sensors enables continuous monitoring of the elder and of chronic diseases. As smart devices become popular, development of the WBAN becomes easier. Our research implemented an integration platform that consists of WBAN and cloud computing based on the Transmission Control Protocol (TCP). We optimized the WBAN and the TCP as a sampling rate control. A sampling rate is the number of transfer data per second. The sampling rate is an important factor in the resolution of waveforms, though high sampling rates can cause a decline in network performance. A smart device performs three threads, such as Bluetooth, main, and TCP. The Bluetooth thread was implemented to collect vital signs from sensing nodes. The main thread performs computations for drawing waveforms and transmits data to the TCP thread. The TCP thread transmits vital signs to a server. We verified our proposed integration platform with formal verification and simulation. We expect to contribute to the platform development of WBAN and to cloud computing.

A Low-Power Microcontroller with Accuracy-Controlled Event-Driven Signal Processing Unit for Rare-Event Activity-Sensing IoT Devices

A specially designed microcontroller with event-driven sensor data processing unit (EPU) is proposed to provide energy-efficient sensor data acquisition for Internet of Things (IoT) devices in rare-event human activity sensing applications. Rare-event sensing applications using a remotely installed IoT sensor device have a property of very long event-to-event distance, so that the inaccurate sensor data processing in a certain range of accuracy error is enough to extract appropriate events from the collected sensing data. The proposed signal-to-event converter (S2E) as a preprocessor of the conventional sensor interface extracts a set of atomic events with the specific features of interest and performs an early evaluation for the featured points of the incoming sensor signal. The conventional sensor data processing such as DSPs or software-driven algorithm to classify the meaningful event from the collected sensor data could be accomplished by the proposed event processing unit (EPU). The proposed microcontroller architecture enables an energy efficient signal processing for rare-event sensing applications. The implemented system-on-chip (SoC) including the proposed building blocks is fabricated with additional 7500 NAND gates and 1-KB SRAM tracer in 0.18 um CMOS process, consuming only 20% compared to the conventional sensor data processing method for human hand-gesture detection.

TEST: Testing Environment for Embedded Systems Based on TTCN-3 in SILS

The Testing and Test Control Notation Version 3 (TTCN-3) is an internationally standardized language for defining test specifications for a wide range of computer and telecommunication systems. Since embedded systems software is frequently used in case that safety is a primary issue and reliability is critical in the systems, it is necessary for the embedded systems software to use a systematic testing method such as TTCN-3. Unfortunately, the difference of testing environment between embedded and PC-based software makes developers hard to test the software, and hence products not tested thoroughly could be released in the market, which can be a potential disaster. In this paper, we review the TTCN-3 testing system and suggest a modified TTCN-3 testing environment for embedded systems software in Software In the Loop Simulation (SILS). A simple example shows our demonstration of testing embedded systems software based on the proposed TTCN-3 testing system.

Cloud computing for u-health and automotive environment

Recently ubiquitous health which can monitor individual health condition always and everywhere is being researched. The elderly and the chronic disease can have their own personal healthcare devices and they can monitor themselves easily. But some kind of limitation is still remaining in their life even if they have powerful smart devices. They need to go to get treatment and to prepare medicine but automotive system does not support interfaces for personal healthcare devices. We consider performance of Bluetooth in order to build efficient network that consist of compliant IEEE 11073 medical devices in automotive environment. Also, to manage efficient automotive, interconnection between IVN and smart device is considered.

Distributed hierarchical service network for automotive embedded system

Automotive embedded systems are connected with In-Vehicle Network (IVN) to provide complex functionality, flexibility and scalability. As many as automotive embedded systems are connected to the IVN, design of IVN is complicated. Also, Performance of IVN cannot be assured. This paper proposes distributed hierarchical service network architecture to solve the problems. Proposed network architecture has two layers, service management layer and service control layer. Service management layer manages services dynamically without a central supervisor and time-controlled scheme. Also, Service management layer can disperse network traffic. This makes design of IVN easier and assures performance of IVN. We show simple system architecture and service management scheme. Network service architecture we proposed can be easily applied to automotive embedded system from simple area to complex area with various IVNs.