Joonseok Park

Pusan National University | PNU · Division of Computer Science and Engineering

A cloud-computing company or user must create a virtual machine to build and operate a cloud environment. With the growth of cloud computing, it is necessary to build virtual machines that reflect the needs of both companies and users. In this study, we propose a bespoke virtual machine orchestrator (BVMO) as a method for constructing a virtual mac...

In this paper, we propose a smart contract broker to improve the reusability of smart contracts in a blockchain environment. The current blockchain platform lacks a standard approach to sharing and managing smart contracts, which makes it difficult for developers to reuse them and leads to efficiency issues. The proposed smart contract broker uses...

A cloud-computing company or user needs to create a virtual machine to build and operate a cloud environment. With the growth of cloud computing, it is necessary to build virtual machines that reflect the needs of companies and users. In this paper, we propose a Bespoke Virtual Machine Orchestrator (BVMO) as a method of constructing a virtual machi...

Smart environments, such as smart cities and streets, contain various heterogeneous devices and content that provide information to users and interact with each other. In a smart environment, appropriate content should be provided based on the situations of users. Additionally, when a user is in motion, it is necessary to provide content in a seaml...

With the popularization of cloud computing, various cloud services have emerged, and hybrid clouds that can take advantage of combining public and private clouds are attracting attention. However, because of their variety, determining a combination of cloud services suited to the user’s current environment and requirements is expensive when deployi...

Microservices are small-scale services that can operate independently. An application consisting of microservice units can be developed independently as a service unit, and it can handle individual logic without being affected by other services. In addition, it is possible to rapidly distribute the configured microservices by a container, and a con...

The advent of software-defined networking (SDN) has led to the paradigm of programmable network environments. Conceptually, the structure of SDN is divided into three layers: application, control, and infrastructure. The SDN controller in the control layer can configure and execute the routing of applications to the infrastructure layer consisting...

Recent years have seen a paradigm shift from PC-centric computing to cloud computing. The advent of cloud computing has led to the emergence of various cloud services and providers. Cloud service brokers (CSBs) were introduced to serve as intermediaries between cloud service providers and cloud users who wish to select an appropriate cloud service....

A paradigm shift from a PC-centric to a cloud computing environment has occurred because of rapid and continuous improvements in the IT environments. With the expansion of cloud computing, various types of cloud services are emerging, collectively known as XaaS (that is, “everything as a service”), including Infrastructure as a Service, Platform as...

Background/Objectives: When an IoT service failure occurs, it is difficult to identify the source of the problem. In order to ensure stale IoT services, error causes need to be identified and the flow of interconnection services controlled. Methods/Statistical Analysis: Two types of requirements, namely, platform-device direct connections, and plat...

Depending on the increase amongst various cloud services, the technology of the Cloud Service Broker (CSB) to find the most appropriate services to meet the needs of cloud service consumers has emerged. In order to advance for cloud services to be used through the CSB, it is important to ensure the quality level that meets the demands of consumers...

With the expansion of the cloud computing paradigm, various cloud services are emerging. As a consequence, the utilization of cloud services has increased. However, the complexity of cloud service usage is also increasing, because the cloud providers have different performance levels and prices for cloud services that offer similar functions. There...

With the recent advent of the cloud computing paradigm, the concept of a cloud service broker (CSB) is rapidly emerging. The general role of the CSB is to intermediate cloud services. However, to adopt and realize this concept, we need to identify the primary stakeholders, define key requirements, and define the overall structure of the CSB. It is...

클라우드 서비스가 증가하고 다양해짐에 따라 클라우드 서비스 소비자들의 요구사항을 만족하는 가장 적절한 서비스를 찾아주는 클라우드 서비스 브로커 기술이 나타났다. 클라우드 서비스 브로커를 통해 클라우드 서비스가 사용되는 것을 촉진시키기 위해서는 서비스 수준 협약(SLA) 기반의 협상 과정을 통해 소비자들의 요구사항에 맞는 품질 수준을 보장하는 것이 중요하다. 그러나 클라우드 서비스 유형 별로 품질 수준을 표현하는 측정 기준과 척도, 계산 방식이 상이하다. 따라서 클라우드 서비스의 품질에 대한 가변성을 분석하고, 분석된 품질 수준을 보장 및 개선하기 위한 SLA 모델이 필요하다. 본 논문에서는 cross-cutting 개념...

Advances in mobile technology and significantly increasing utilization of mobile devices such as smartphones and tablets have resulted in a paradigm shift from PC-centric computing to mobile computing. The results of careful analysis conducted of this mobile landscape indicate that there is a growing demand for smart, user-centric, situation-aware...

클라우드 컴퓨팅 패러다임이 성행하면서 IaaS, PaaS, SaaS 유형의 클라우드 서비스가 나타났다. 제공되는 클라우드 서비스의 다양화로 인해 클라우드 테넌트(사용자)의 요구사항에 적합한 클라우드 서비스를 중개하는 기술인 서비스 브로커 기술이 최근 들어 관심을 받고 있다. 클라우드 서비스를 중개하기 위해서 다양한 클라우드 서비스의 체계적인 등록, 분석, 검색을 지원할 수 있는 클라우드 서비스 명세 모델이 필요하다. 본 논문은 클라우드 서비스가 가질 수 있는 공통성과 가변성을 반영하여 다양한 유형의 클라우드 서비스를 명세하기 위한 가변성 기반의 클라우드 서비스 분석 모델을 제시한다.

As the prevalence of cloud computing increases, various cloud service types have emerged, such as IaaS, PaaS, and SaaS. The growth and diversification of these cloud services has also resulted in the development of technology for cloud service brokers (CSBs), which serve as intermediate cloud services that can assist cloud tenants (users) in deploy...

With the recent advent of mobile devices such as smart phones and tablet PCs, everyone wants to receive personalized service and control the environment using a mobile device (i.e., ubiquitous computing). To fulfill this requirement, the necessary, key technology is situation awareness. Today, ontology-models are widely used for representing and co...

The high portability and mobility of mobile devices have given rise to critical concerns with regard to mobile situation-aware services that utilize user situation information in the mobile domain. Mobile situation-aware services for mobile devices are provided by collecting and analyzing data, from which the user situation is inferred through an i...

Recently, the Web Ontology Language (OWL) and Semantic Web Rule Language (SWRL) have been widely used to construct situation-aware environments. However, incorrect situations can be inferred, and these decrease the quality of situation-aware services. SWRL rules are one of the main causes of incorrectly inferred situations. Therefore, in this paper...

Software product-line engineering is the successful reuse of technology when applied to component-based software development. The main concept and structure of this technology is developing reusable core assets by applying commonality and variability, and then developing new software reusing these core assets. Recently, the emergence of service-ori...

With the emergence of SOA (service oriented architecture), a business process can be realized as a Web service. A business process can be viewed as a requirement phase artifact and Web service can be viewed as a development phase artifact. By reducing the gap between a business process and Web service, we can extend the reusability, flexibility, an...

The business processes of an enterprise are its core asset, enabling a prompt and flexible response to business changes. Recently, business processes have attracted considerable interest with the emergence of service-oriented computing environments. In these environments, the business process acts as a connection point between the business and info...

Through the introduction of SOA(Service Oriented Architecture), enterprises have recently had the benefit of legacy software reuse, heterogeneous environment integration, and ROI(Return On Investment) maximization. SOA consists of a service client, service provider, and service registry. Within this environment, we proposed a service with variabili...

To cope with requirement changes flexibly and rapidly, the existing component-based paradigm is being evolved into a service-oriented computing paradigm. The main characteristic of the service-oriented computing paradigm is that service-oriented applications are developed as loosely coupled services that reflect business concerns. This paradigm als...

Today, the software environment paradigm is shifting to service-oriented computing, based on key features that reflect business concerns. The SOMA and SOUP methodologies can be used to develop service-oriented applications. However, these approaches focus on developing monolithic service applications. Therefore, we propose a feature-based reusable...

Service-oriented computing is an emerging environment for business agility in the software industry. Today, there is a focus on developing service-oriented software. In this environment, service is a key feature reflecting business concerns. However, there is still debate about how best to reflect business concerns in services and how to create mor...

Service-Oriented Architecture (SOA) is a conceptual architecture that was proposed for supporting service-oriented computing. To obtain a successful design and development of service-oriented software, an architectural view model to represent and document various aspects of service-oriented software based on the SOA conceptual template is required....

Commonality and variability play central roles in all product line development processes. Indeed, at each phase of core assets development, variabilities can exist at different levels of abstraction and in addition can be concretized by different artifacts. In this paper, we suggest a 2-dimensional framework for analyzing variabilities of core asse...

Ubiquitous computing (ubicomp) environments provide access to information and computing resources for users at any time and anywhere. In the approaching ubiquitous ear, many self-adaptive applications are emerging. These can be made to adapt to the environment within which the application operates. Context information is the key to producing self-a...

The realization of a smart home is accelerating with the approach of the ubiquitous computing era. A smart home should provide proper service as user's preference. In addition, it should guarantee appropriate responses to changes in the external environment. To achieve these objectives, a smart home requires a service definition that is provided by...