Mobile IPv6환경에서 이동노드의 효율적인 위치 관리 방안

신충수,문영성,Shin Chung-Soo,Mun Young-Song 한국정보처리학회 2006 정보처리학회논문지 C : 정보통신,정보보안 Vol.13 No.2

Mobile IP는 노드의 이동성을 제공함으로써 보다 향상된 서비스를 제공해 준다. Mobile IP에서 이동노드는 이동시마다 홈 주소와 외부 네트워크에서의 주소를 바인딩 하기 위한 메시지를 홈에이전트에게 보내야 한다. 이러한 이동관리 메시지는 노드 자체의 처리비용과 네트워크상의 많은 트래픽을 유발할 수 있다. Paging Hierarchical Mobile IPv6(PHMIPv6)는 위치 관리 비용을 줄이기 위해 Hierarchical Mobile IPv6 (HMIPv6) 환경에서 페이징 기법을 적용하여 이동노드의 상태를 고려한 위치 관리를 수행한다. PHMIPv6에서 이동노드는 통신 중이지 않을 경우 도메인 내부에서 이동을 하여도 위치 바인딩 메시지를 보내지 않음으로써 위치 관리에 사용되는 비용을 절약할 수 있다. 그러나 외부에서 패킷이 도착 시 수행하는 페이징 메카니즘의 비용이 크기 때문에 상황에 따라 많은 위치 관리 비용이 발생할 수 있다. 본 논문에서는 PHMIPv6의 문제점을 분석하고 이동관리 시그널을 줄이기 위한 방안을 제안한다. 제안방안은 효율적으로 페이징 시그널을 줄임으로써 전체적인 위치 관리 비용을 줄이게 되고, 서브넷 수에 의존하지 않고 동작함으로써 HMIPv6 보다 약 50% 정도의 성능향상을 보였다. The Mobile IPv6 provides the enhanced internet services to user by supporting a node's mobility. In Mobile IPv6(MIPv6), the mobile node sends the binding message which binds home address(HoA) with care-of address(CoA) to the home agent whenever it changes its point of attachment to the internet. To reduce the mobility management signal message the Paging Hierarchical Mobile IPv6(PHMIPv6) is proposed. The mobile node does not send the binding message within the domain if the mobile node's state is idle. Therefore the mobility signal message cost can be reduced. However, when the mobile node's session arrival rate is high the many mobility management signal cost are needed because the paging cost is very high. In this paper, we analysis the drawback of PHMIPv6 and propose the scheme which can reduce the mobility management signal cost. The proposed scheme works independent of the number of subnet in the domain. Therefore the proposed scheme can improve the mobile node's mobility management scheme.

Mobile Telephone Usage in Public Spaces in Seoul Metropolitan Area

Woong K. Park 한국언론학회 2008 Asian Communication Research Vol.5 No.2

One of the most (in) visible developments in mediated-communication is continual exchange of information within the realms of public/private space by the use of mobile telephone. It is expected that 1,467 million (or more) mobile telephones will be in use worldwide. For the first time this figure was expected to be higher than the corresponding figure for conventional landline (wired) phones. However, the adoption and wide-spread use of mobile telephone and its technology, became an instrument that collapsed previous forms of public and private spaces/lives. My aim in this paper is to observe and describe the forms of interactions, which used to be private, but now are conducted in public space by the usage of mobile telephone. How does the usage of mobile telephone affect the notions and experiences of private/public spaces/time/and place? Indeed, the advent of mobile telephone has contributed to the reorganization of work and leisure. It has created instant meeting places, with more accuracy and mobility. The mobile phone is becoming a truly ubiquitous device. Koppoma (2000) argues that mobile telephone has revolutionized traditional social structures. However, we should not haste our observation and judgment here-mobile phone use amplifies and reformulates already existing cultures and norms. The increased speed of connectivity and information transmission, as well as the increased facility of transportation/movement may have changed our notions of time, of the nature of the present, and of distance. Mobile telephones change our notion of time as something non-linear, rather than linear -more fluid than rigid, more flexible than fixed. We are witnessing uncoupling of the spaces of social, economic, and cultural interactions, flow and mobility from the particularities/expectations of individual places. People with mobile telephones reconstruct and reformulate the way space, time, and places are used, appropriated, and mediated. This transformation of the complex interplay of how space, time, and places are used will support new development and social dynamics.

Mobile Resource Reliability-based Job Scheduling for Mobile Grid

( Sung Ho Jang ),( Jong Sik Lee ) 한국인터넷정보학회 2011 KSII Transactions on Internet and Information Syst Vol.5 No.1

Mobile grid is a combination of grid computing and mobile computing to build grid systems in a wireless mobile environment. The development of network technology is assisting in realizing mobile grid. Mobile grid based on established grid infrastructures needs effective resource management and reliable job scheduling because mobile grid utilizes not only static grid resources but also dynamic grid resources with mobility. However, mobile devices are considered as unavailable resources in traditional grids. Mobile resources should be integrated into existing grid sites. Therefore, this paper presents a mobile grid middleware interconnecting existing grid infrastructures with mobile resources and a mobile service agent installed on the mobile resources. This paper also proposes a mobile resource reliability-based job scheduling model in order to overcome the unreliability of wireless mobile devices and guarantee stable and reliable job processing. In the proposed job scheduling model, the mobile service agent calculates the mobile resource reliability of each resource by using diverse reliability metrics and predicts it. The mobile grid middleware allocated jobs to mobile resources by predicted mobile resource reliability. We implemented a simulation model that simplifies various functions of the proposed job scheduling model by using the DEVS (Discrete Event System Specification) which is the formalism for modeling and analyzing a general system. We also conducted diverse experiments for performance evaluation. Experimental results demonstrate that the proposed model can assist in improving the performance of mobile grid in comparison with existing job scheduling models.

모바일커머스 환경에서 품질, 제도 개선이 이용자 신뢰에 미치는 영향

김종락 한국인터넷전자상거래학회 2019 인터넷전자상거래연구 Vol.19 No.6

Smartphone mobile shopping environment is different from internet shopping mall environment. In particular, in order to increase the consumer's confidence in building a mobile shopping environment, a mobile-centric system environment that is completely different from the conventional Internet e-commerce usage environment is required. The researches related to the mobile shopping environment, which have been studied so far, are based on factors that affect the usability and usability of the mobile environment, content quality, and systemic mechanisms. Therefore, this study aimed to understand the causal relationship between mobile content quality and institutional environmental improvement factors on user's mobile shopping trust factors in the user-centered environment. We will develop an optimal use environment for institutional improvement factors of mobile system. Furthermore, it is expected to give practical implications for the establishment of business strategy for building the optimized mobile commerce user environment in the future. On the other hand, this study further refined and refined each item of content quality and institutional mechanism characteristics based on the previous results of optimized online shopping mall quality and institutional improvement factors verified through previous studies. In conclusion, due to the lack of institutional mechanisms such as content quality constraints that consumers experience through mobile shopping and security systems that cant be perceived negatively if they are t institutionalized, the Internet shopping mall environment in terms of user environment is ultimately Constraints will appear when trading via mobile. Therefore, this study empirically explores the relationship between quality and institutional improvement factors on user trust in mobile m-commerce environment, which is more limited than e-commerce. Furthermore, it is expected to provide practical information on marketing strategies for improving the commercial environment for social media by extending the theory in the future.

Systematic Literature Review : Security Challenges of Mobile Banking and Payments System

Md. Shoriful Islam 보안공학연구지원센터 2014 International Journal of u- and e- Service, Scienc Vol.7 No.6

Mobile banking is more easily and fast banking today, but its challenges to payments security system. Many organization or financial institutions are now incorporating mobile banking and financial services as a key component of their growth strategy, and use of the mobile phone to conduct banking and financial services tasks continues to rise among early adopters. Large number of security challenge of mobile banking and payment system have been proposed in to the current research issues, our goal is to gain insight into the current status of mobile banking and payment system security challenge research issues published to date, conducted a systematic literature review mobile banking security challenges that have been claimed between January 2008 to December 2012.this paper presents the result of the systematic review, 10 publication and 20 were selected as primary studies, from which a large number of challenges were elicited. By applying qualitative data analysis methods to extracted data from the review. However among the majority of consumers, security threats are most commonly listed as the primary reason for not trying mobile banking. This review will attempt to technically address these largely unfounded consumer security fears while helping to lay a roadmap for financial institutions successful implementation of mobile banking technology. A clear and emerging new channel in the space of banking and payments is mobile. A key challenge with gaining user adoption of mobile banking and payments is the customer’s lack of confidence in security of the services. Understanding the mobile banking and payments market and ecosystem is critical in addressing the security challenges. There are new security risks introduced with mobile banking and payments that must be identified and mitigated.

대학이러닝 학습자의 모바일학습에서 학습행태, 학습스타일, 학업성취도에 대한 연구

노혜란,최미나 한국교육정보미디어학회 2019 교육정보미디어연구 Vol.25 No.3

The purpose of this study is to investigate how mobile learners behave in university e-learning, to investigate whether there is a difference in mobile learning behaviors according to the learners’ learning style, and whether learner traits and mobile learning behaviors have an effect on academic achievement. In order to analyze the mobile learning behavior, we collected the access log data of LMS for students who took e-learning courses that can take mobile courses at S university in Chungbuk in the first semester of 2015. Four mobile learning behavior questionnaires were developed by analyzing the related research. Gregorc’s learning style tools were used to analyze the learning style, and academic achievements were made using the course grades. A total of 85 subjects were available. The results of this study are as follows: First, as a result of analyzing the learner’s mobile learning behavior, the learners learned an average of 1,290 minutes during the semester, and they learned that they spent 1,169 minutes on the PC and 121 minutes on the mobile. As total leaning time increased, PC learning time increased, but mobile learning time tended to decrease. Second, the results of one-way ANOVA on the difference of mobile learning behaviors according to the learners’ learning styles showed that the abstract sequential type learners perceived mobile learning to be more helpful than the abstract random types. Third, as a result of the multiple linear regression analysis, it was found that the performance of the humanity and social sciences students and the smaller the proportion of mobile learning in the total learning time are the greater the academic achievement. 본 연구는 대학이러닝에서 학습자들의 모바일 학습행태가 어떠한지를 살펴보고, 학습자의 학습스타일에 따라 모바일 학습행태에 차이가 있는지, 학습자 특성과 모바일 학습행태가 학업성취도에 영향을 미치는지를 탐색해 보고자 하였다. 모바일 학습행태를 분석하기 위하여 2015년 1학기에 충북의 S대학교에서 모바일 수강이 가능한 이러닝 강좌를 수강한 학생을 대상으로 LMS의 접속 로그 데이터를 수집하여 누적 PC 학습시간과 모바일학습 시간을 조사하였고, 관련 선행연구를 분석하여 4개의 모바일 학습행태 측정문항을 개발하였다. 학습스타일의 분석을 위해 Gregorc의 도구를 활용하였으며 성취도는 수강과목의 학점을 활용하였다. 유효한 대상자는 총 85명이었다. 연구결과 첫째, 학습자의 모바일 학습행태를 분석한 결과 수강 학기 동안 학습자는 평균 1,290분을 학습했는데 PC로 1,169분, 모바일로 121분을 학습한 것으로 나타나 PC로 수강하는 시간이 많은 것으로 분석되었으며, 총 학습 시간이 증가할수록 PC 학습시간은 증가하였으나, 모바일 학습시간은 감소하는 경향을 보였다. 둘째, 학습자의 학습스타일에 따라 모바일 학습행태에 차이가 있는지에 대한 일원분산배치분석 결과, 추상임의형보다 추상순차형의 학습자가 모바일 수강이 더욱 도움이 된다고 인식하는 것으로 나타났다. 셋째, 학습자의 특성과 모바일 학습행태가 학업성취도에 미치는 영향을 알아보기 위하여 중다선형회귀분석을 실시한 결과, 인문사회계열 학생일수록, 총 학습시간 대비 모바일 학습비중이 작을수록 성취도가 커지는 것으로 나타났다.

모바일 미디어 인식 유형에 관한 연구 : 모바일세대(M generation)를 중심으로

이호은 한국주관성연구학회 2007 주관성연구 Vol.- No.15

Mobility is the most remarkable feature of Mobile communication which would be used by 30billion people, about 45% of whole population, in 2010. Mobility would accelerate the individualism and help to develop the human communication method by increasing the time people use the mobile media. The Mobile Media which is essential to Mobile communication is leading the digital revolution. However, the important thing in technical development is what people would experience and the cultural meaning. Mobile media does not only just another new media for human communication, but also a content composing the cultural ecosystem in modern society. In this paper, I'm going to take a hard look at the generation who has grown up with mobile media which is outstanding change in human society. They have got the mobile phone when they were in elementary school or middle school. They communicate within these mobile media and keep the relationship with developed network technology. Also, as they have manifest opinion, the big brother or any large corporate doesn't make a little dent on them (at all). But the important thing is that this generation has just started, and could give us a clue as to see the futures. Based on their mobile phone usage preferences, 3 types of mobile users were identified. Their ideal mobile usage is post-report about their preferences to mobile. 1) The First N=16) ; The Mobile culture-oriented in everyday-life They are making the best use of mobile. They even use the information in wireless internet. The most remarkable thing is not even conventional function from any other media, even their physical method has been changed, they have used actively. They are picking up as they need. For example, they may search the map of underground, use as an flashlight, take a memo when they need. On the other hand, they do not care about complicate things, they are not interested in interact between their devices. Also, they prefer all-in-one device. 2) The Second (N=6) ; The Digital culture-oriented actively. Not like the first group, they access the exiting media through mobile. They uses mobile media as a method to access another media. This group uses mobile banking, get the mobile tickets in theatre or market. Even they don’t use them everyday-life, but they make the mobile another method which enriches life. However, they think that exiting mobile phone cannot be alternative of physical media. 3) The Third (N=1) does not have any specialty. 4) Identities between these 3 groups Between the patterns mentioned above, some identity such as MP3, Mobile banking sercive, Games, P2P and Dictionaries can be found, not included GPS, Comic books, Cyworld (popular website in Korea. Structuring own homepage), etc. It means that people uses the mobile when the media is proper. Especially, they may not use under hardness to apply.Easy accessibility and convenience could be the most essential function of mobile phone to Mobile generation. Specially, convenience of mobility attracted to 20’s chasing much faster thing. Individualism of mobile also have been regarded as one of features of mobile. After all, the advantage is that it can be a individual media as well as a information channel. Information in mobile still can help private business done. Such as Mobile banking, mobile makes official service private business. As culture is the result of conventional habits and acts, emergent example of mobile generation’s usage can explain the culture in the future.

디지털 모바일 컨텐츠상의 애니메이션 캐릭터 특성에 관한 연구

이성신 ( Hong Gil Dong ),윤찬종 ( Yoon Chan Jong ) 한국디자인트렌드학회 2005 한국디자인포럼 Vol.12 No.-

휴대폰 화면에 자신만의 캐릭터를 띄우는 모바일 애니메이션 캐릭터 다운로드 서비스는 지난 2002년부터 모바일 컨텐츠 분야의 최대 수익사업으로 자리를 잡고 있다. 21세기가 시작되고, `이동성을 가진 것(모바일)`에 대한 소비자들의 관심이 커지면서 모바일 환경이 크게 변화하였는데 이 변화는 캐릭터 산업의 발전에 크게 기여하였다. 캐릭터의 활용공간과 활용소스가 확장되어 그 가능성을 거의 무한하게 만들었다는 점이다. 모바일의 `꽃` 으로 불리는 컨텐츠 시장은 2002년 이후로 외형상 폭발적인 성장세를 보였고, 각 이동통신사가 무선 포털을 통해 제공하는 컨텐츠 수가 10,000여 개를 넘은지 오래다. 여기에 애니메이션 캐릭터는 일반 캐릭터 구성요소에 움직임이라는 동적요소를 불어넣어 영상 애니메이션처럼 자연스럽지는 않지만 소비자들의 큰 관심을 끌어 커다란 시장으로 발전하였다. 그러나 캐릭터 산업 환경의 변화가 반드시 모바일 컨텐츠 산업에 있어서 기회요인으로만 작용하지 않을 수도 있다. 매체의 특성에 따라 고객의 니즈(needs)가 다양화되면서 다양한 캐릭터 애플리케이션의 개발과 새로운 이슈를 스스로 발굴해야하는 등 관련 종사자에게 많은 과제를 던져주고 있기 때문이다. 이러한 점을 비추어 볼 때 새로운 환경과 기존의 환경을 접목시키려는 보다 효과적인 캐릭터 모델과 컨텐츠가 필요한 시기라고 할 수 있다. 따라서 본 연구에서는 이러한 문제점의 한 방법 으로서 모바일 컨텐츠와 애니메이션 캐릭터의 구성요소를 파악하여 모바일 애니메이션 캐릭터의 특성을 분석하고, 향후 개발 가이드라인을 제시하고자 한다. 모바일 애니메이션 캐릭터는 그 특성에 따른 다양한 상품화를 위한 캐릭터 디자인 작업에 중점을 두어야 하며 상품을 위한 기획과 디자인을 위한 명확한 캐릭터 상품 조사와 캐릭터 상품화 후의 이미지 유지 및 업그레이드 작업을 통한 캐릭터의 생명을 장기적으로 지속시켜 주어야 한다. 또한 모바일 애니메이션 캐릭터는 고객과 직접적으로 접촉하는 수단이기에 그만큼 고객과의 친밀도가 중요하다. 모바일 기기의 빠른 발달에 더불어 좀 더 변화적이고 다양한 캐릭터의 특성을 나타내야 할 것이며 응용요소(표정, 배경, 액세서리, 색채, 패션 등)에 따른 개별적 연구가 진행 되어야 할 것이다. Mobile character download service displaying user`s own character on mobile phone screen has been settled as the maximum profit service in the area of mobile contents since 2002. As the 21st century began and consumers` interest in `something mobile` has been increased, mobile environment has been also changed greatly and these changes have contributed to the development of character industry. Utilization space and source of character have been extended and their potential have been infinite. Contents market called `flower` of mobile showed an explosive growth in external aspect since 2002 and the number of contents provided through wireless portal by mobile communication service companies was already over 10,000. Animation character has inspired dynamic factor of movement to general character components and has been developed to an influential market by attracting consumers` concerns. However, changes of character industry environment have not been acted as an opportunity factor in mobile contents industry. As consumers` needs vary depending on the characteristics of media, it throws many tasks to those who must develop various character applications and new issues. In light of these factors, more effective character model and contents which combine new environment with existing environment are needed. Therefore, this study aims to understand components of mobile contents and animation character as a solution of these problems, analyze characteristics of mobile animation character and suggest future development guideline. Mobile animation character must focus on character design work for a variety of merchandising and character life should be continued through clear character goods survey for planning and designing merchandising, and post-image maintenance and upgrade of merchandising character. In addition, since mobile animation character is a means to a direct contact with customers, its familiarity with customers is important. More varied and diversified characteristics of character should be expressed with a rapid development of mobile equipments and individual researches on applied factors (look, background, accessory, color, fashion, etc.) should be developed.

Mobility-Aware Ad Hoc Routing Protocols for Networking Mobile Robot Teams

Das, Saumitra M.,Hu, Y. Charlie,Lee, C.S. George,Lu, Yung-Hsiang The Korea Institute of Information and Commucation 2007 Journal of communications and networks Vol.9 No.3

Mobile multi-robot teams are useful in many critical applications such as search and rescue. Explicit communication among robots in such mobile multi-robot teams is useful for the coordination of such teams as well as exchanging data. Since many applications for mobile robots involve scenarios in which communication infrastructure may be damaged or unavailable, mobile robot teams frequently need to communicate with each other via ad hoc networking. In such scenarios, low-overhead and energy-efficient routing protocols for delivering messages among robots are a key requirement. Two important primitives for communication are essential for enabling a wide variety of mobile robot applications. First, unicast communication (between two robots) needs to be provided to enable coordination and data exchange. Second, in many applications, group communication is required for flexible control, organization, and management of the mobile robots. Multicast provides a bandwidth-efficient communication method between a source and a group of robots. In this paper, we first propose and evaluate two unicast routing protocols tailored for use in ad hoc networks formed by mobile multi-robot teams: Mobile robot distance vector (MRDV) and mobile robot source routing (MRSR). Both protocols exploit the unique mobility characteristics of mobile robot networks to perform efficient routing. Our simulation study show that both MRDV and MRSR incur lower overhead while operating in mobile robot networks when compared to traditional mobile ad hoc network routing protocols such as DSR and AODV. We then propose and evaluate an efficient multicast protocol mobile robot mesh multicast (MRMM) for deployment in mobile robot networks. MRMM exploits the fact that mobile robots know what velocity they are instructed to move at and for what distance in building a long lifetime sparse mesh for group communication that is more efficient. Our results show that MRMM provides an efficient group communication mechanism that can potentially be used in many mobile robot application scenarios.

Interface, Mobile-Text and Modalities of Mobile Phones

Jae-Hyun Lee 서울대학교 언론정보연구소 2006 언론정보연구 Vol.43 No.1

Mobile phone has evolved from a voice-only medium into multimedia. Unfortunately, studies on mobile phones thus far have been unable to keep pace with developments in technology and service marketing. As a result, there are some biased tendencies in present day social and academic discourses on mobile phones. First, the marketing discourses are placing a strong emphasis on the technical developments of the mobile media. Second, there is a strong tendency in academic discourse to regard mobile phones as simply 'phones', namely a mono-medium. Thus, existing marketing and academic discourses have been incapable of providing a thorough understanding on the substance of the mobile phone. Only by understanding the media characteristics of the mobile phones can we understand its substance. In this context, I will attempt to approach this medium in three venues: interface, mobile-text, and modalities.