Oh-Cheon Kwon

Design and implementation of status based application manager for telematics

The applications for telematics are not any more limited to classical embedded control system but cover a broad range from driver assistance to infortainment and vehicle information management. To manage various kinds of telematics application, we need furthermore new application manager for the automotive domain that allow to support the different software types specifically, corresponding to their vehicles status and later on integrate the system parts to one reliable and manageable system. This paper is intended to suggest an architecture for applications management in the field of in-vehicle software. This architecture is based on international standards, such as OSGi framework and AMI-C Specification

An approach to composition of EJB components using C2 style

EJB (Enterprise JavaBeans) is the server-side component model, and its purpose is to reduce the complexity of software development and to increase software reusability. Many concerns for development of EJB components have recently been raised. However, it is difficult to compose EJB components provided by third parties through the plug-and-play technique. Therefore, the composition method by Lego block styles is needed for EJB components. In this paper, the authors propose an approach to composition of EJB components using the C2 architectural style. In order to support EJB composition, our approach generates EJB wrappers that can be used in composing EJB components based on the C2 style. Also, our approach enables developers to create a new composite EJB for a C2 architecture, which is a large grained component and is composed of EJB components.

Component adaptation using adaptation pattern components

CBD (component-based development) or COP (component-oriented programming) has recently been adopted as a better method for software development. However, in order for CBD technology to be more successful, binary components developed and deployed by a third party or a vendor should be adaptable if the components do not meet a component users requirements. A component user usually requires component adaptation if the provided interface and the required interface of a component are mismatched, or if a component attribute and method need to be modified. In this paper, an adaptation method for binary components using adaptation pattern components is proposed. The proposed method solves the problem of a component becoming ever larger as it is continuously adapted. The conventional method of component adaptation - by a wrapping technique - repeatedly performs the wrapping of an existing component whenever component adaptation is required, even if it is for the same reason each time. However, the adaptation technique proposed in this paper provides a new mechanism for supporting component adaptation by using reusable adaptation pattern components.

Maintenance with reuse: an integrated approach based on software configuration management

Software reuse has recently been considered the best solution to enhance the productivity of a software development team and to reduce maintenance costs. In addition, software configuration management (SCM) is a central part of software maintenance as it is associated with changing existing software, and is a discipline for controlling these changes and improving the maintenance process, thereby enhancing the quality of a software product. Thus, both software reuse and SCM have been proposed for making a significant improvement in productivity, quality and cost. However, so far these two technologies have been investigated separately. In order for software reuse and SCM to produce effects by synergy, both approaches require to be introduced into a maintenance environment together. Since software reuse and SCM, and software reuse and software maintenance have many similarities and relationships in their activities, these disciplines can be integrated within a software maintenance environment. The authors have therefore developed an integrated process model for maintenance with reuse (MwR) that supports SCM for a reuse library which is actively maintained for use in a maintenance environment. In this paper the MwR model and its prototype are described, followed by evaluation using a case study and conclusions.

Context-based preference analysis method in ubiquitous commerce

As the age of ubiquitous commerce is upon us, personalization service is getting interested. Therefore, the recommendation methods that offer useful information to the customers become more important. However, most of them depend on a specific method and are restricted to the e-commerce. For applying these recommendation methods into U-commerce, first it is necessary that the extended context modeling and systematic connection of the methods to supplement some deficiency of each recommendation method. Therefore, we propose a modeling technique of context information related to personal activity in commercial transaction and show incremental preference analysis method, using preference tree which is closely connected to recommendation method in each step. And also, we use an XML indexing technique to efficiently extract the recommendation information from a preference tree.

Monitoring vehicle outliers based on clustering technique

Display Omitted Develop a novel framework for monitoring vehicle outliers caused by complex vehicle states.Suggest techniques of clustering vehicle data needed in abnormal state monitoring.Show an approach identifying characteristics of clusters by sampling representative attributes.Analyze clustered data effectively through relations between vehicle data and states.Monitor current vehicle states and predict future phenomena through a location-based analysis. In this paper, we develop a novel framework, called Monitoring Vehicle Outliers based on a Clustering technique (MVOC), for monitoring vehicle outliers caused by complex vehicle states. The vehicle outlier monitoring is a method to continuously check the current vehicle conditions. Most of previous monitoring methods have conducted simple operations depending on uncomplicated analyses or expected lifetimes in regard to vehicle components. However, many serious vehicle outliers such as turning off during a drive result from the complex vehicle states influenced by correlated components. The proposed method monitors the current vehicle conditions based on not simple components like the previous methods but more complex and various vehicle states using a clustering technique. We perform vehicle data clustering and then analyze the generated clusters with information of vehicle outliers caused by complex correlations of vehicle components. Thus, we can learn vehicle information in more detail. To facilitate MVOC, we also propose related techniques such as sampling cluster data with representative attributes and deciding cluster characteristics on the basis of relations between vehicle data and states. Then, we demonstrate the performance of our approach in terms of monitoring vehicle outliers on the basis of real complex correlations between outliers and vehicle data through various experiments. Experimental results show that the proposed method can not only monitor the complex outliers by predicting their occurrence possibilities in advance but also outperform a standard technique. Moreover, we present statistical significance of the results through significance tests.

Detection of drowsy driving based on driving information.

A drowsy driving can bring severe traffic accidents. To prevent these accidents and give a warning to a driver, we analyzed the driving information collected from a vehicle simulator and made a model to detect drowsy driving based on vehicles behavior such as steering-related and lane-related information. It will be able to provide more effective service for drivers when applied to a vehicle augmented reality system.

Development of the eco-driving and safe-driving components using vehicle information

In this paper, we develop the components which can get the eco-driving and safe-driving information using various vehicle information as a detail development of Vehicle-IT Convergence Platform by Android platform based mobile devices (e.g., smartphone, tablet). These components use vehicle information (e.g., vehicle mileage information, sensor data) for analyzing the eco-driving and safe-driving information. The vehicle information is gotten through CAN (Controller Area Network) that is inner vehicle network protocol. The vehicle information which is collected by an OBD (On-Board Diagnostics) communication module is transferred to a mobile device through a bluetooth network. The vehicle drivers can change the wrong driving styles and behaviors for themselves as they check eco-driving and safe-driving information these components provide. Through reusing the Application Programming Interfaces (APIs) provided by the eco-driving and safe-driving components, vehicle-IT related companies can develop various mobile service applications more easily and quickly.

Design and Implementation of Component Adaptation Supporting Tool

In this research, the technique and tool for the adaptation of components are suggested. While reusing a component or assembling components, component adaptation should be required since the interfaces of component to be assembled might not be exactly matched. Sometimes, other attributes are needed for new business features or even the same business concept. So, in reusing or assembling a component, component adaptation techniques are essentially required. In this research, we proposed the following Component Adaptation by Binary Component Adaptation Techniques : and Component Adaptation by Adaptation Components. Also, we constructed a component adaptation supporting tool. As the results, we can adapt the existing components without source code and can reuse the existing components when the components do not meet new requirements or can not be directly connected with other components to be integrated.

E-RTO: an enhanced TCP retransmission timeout algorithm using SACK option

The TCP protocol has been widely accepted as a de facto standard for reliable transport of application traffic in the Internet society. However, challenges against TCPs performance arose with emergence of wireless network and has also devised various algorithms for improving its performance in the wireless network. In this paper, we cope with spurious timeout among various challenges. One of previous works, F-RTO efficiently treats delay spike which comes from retransmission of lost packets by reliable wireless link layer, but it does not handle delay spike with segment losses efficiently. We try to give a solution to this problem by introducing E-RTO algorithm and evaluate the performance of E-RTO through simulation by using ns-2. In the experiment, we show that throughput and goodput of E-RTO are improved rather than those of F-RTO and E-RTO does not violate its friendliness with other TCPs