Earticle

There has been a significant paradigm shift in the book industry from print to digital, with the increased use of electronic books (e-books) on e-book readers. The major online booksellers and publishers are devoting their energies to the growth of the e-book market, resulting in an upward spiral in e-book usage, and a resultant increase in the number of downloaded e-books in an e-book reader library. However, there are comparatively few features for e-book management and search in most e-book reader libraries, particularly in smartphone environments. In addition, the user interfaces of e-book management in e-book readers are highly diverse, which has led to major usability issues. In this paper, we analyze user preferences for e-book management and search in the libraries of the five most commonly used e-readers for the Android smartphone platform via a questionnaire survey. Then, we suggest ideal alternatives in addition to user-friendly features based on user preferences for managing e-book libraries, to allow users to more easily browse collections, thereby enhancing the usability of e-book readers.

Information security breach is a major risk in e-learning. This study presents the potential information security disruptions in Learning Management Systems (LMS) from the perspective of users. We use the Technology Acceptance Model approach as a user perception model of information security, and the results of a questionnaire comprising 44 questions for instructors and students across Indonesia to verify the model. The results of the data analysis and model testing reveals that lecturers and students perceive the level of information security in the LMS differently. In general, the information security aspects of LMSs affect the perceptions of trust of student users, whereas such a correlation is not found among lecturers. In addition, lecturers perceive information security aspect on Moodle is and Google Classroom differently. Based on this finding, we recommend that institutions make more intense efforts to increase awareness of information security and to run different information security programs.

Our prediction model is based on the development of "Semantic Location Model." It embodies geometrical and topological information which can increase the efficiency in prediction and make it easy to manipulate the prediction model. Data mining is being implemented to extract the inhabitant's location patterns generated day by day. As a result, the self-learning system will be able to semantically predict the inhabitant's location in advance. This context-aware system brings about the key component of the ubiquitous computing environment. First, we explain the semantic location model and data mining methods. Then the location prediction model for the ubiquitous computing system is described in details. Finally, the prototype system is introduced to demonstrate and evaluate our prediction model.

The one of important issues for the success ofwearable computer is developing its killerapplications. An application of user created content(UCC) in Ubiquitous Fashionable Computer (UFC)[1], introduced in this paper, is an efficient anduseful tool to create and manage user's multimediacontent. The UFC includes a gesture-based userinterface called iThrow. By using this device, userscan control UFC easily and intuitively. The scenarioof our UCC in the UFC is as follows. First a usercaptures an image by using the camera attached inthe UFC. For editing the captured image, the usersend it to a near kiosk by taking throwing action tothe kiosk, and then the image is displayed in thekiosk. The user can edit the image such as rotationor adjusting picture size, brightness, and contrastby taking various intuitive hand-gestures. Afterediting, if the user takes the throwing action again,the final image is uploaded and registered in hisblog automatically.

본 연구는 재난관리자원 통합관리시스템(KRMS)의 낮은 활용률을 설명하기 위해 사용자 및 전문가 기반 평가를 활용한 사용성 분석을 수행하였다. 전문가 휴리스틱 평가는 시스템의 효과성·효율성·만족 도·인터페이스·기타 요소를 중심으로 검토되었다. 그 결과 전체 평가 항목 중 ‘충족’ 항목은 없었고, ‘부분 충족’과 ‘미충족’이 대부분을 차지하였으며, 심각도 또한, 2점(보통 수준 문제)이 가장 높은 비중을 보였다. 한편 사용자 평가는 서울시 지방공기업 재난관리 담당자를 대상으로 대표 과업 기반의 시나리오 수행 후 SUS 설문을 실시하였다. SUS 점수는 평균 24.6점으로 나타나 국제적 기준에서 ‘Not Acceptable’ 수준에 해당하였으며, 복잡한 절차, 메뉴 구조의 과분절 및 낮은 직관성 등이 주요 어려움으로 확인되었 다. 종합하면 KRMS는 정보 구조와 절차 흐름의 복잡성이 높아 실제 업무 맥락에서 사용성이 제약되는 것으로 분석되었다. 본 연구는 공공 재난관리 시스템의 사용자 경험을 체계적으로 진단한 최초의 실증적 사례로서, 향후 KRMS의 개선 방향과 정책적 시사점을 제시하는 데 기초 자료를 제공한다.

This study analyzed the usability of the Korea Disaster Management Resource Integrated Management System (KRMS) using combined user- and expert-based evaluations to explain its low utilization in practice. Expert heuristic evaluation assessed effectiveness, efficiency, satisfaction, interface quality, and related factors, and found that none of the items were rated as “met,” with most judged “partially met” or “not met.” Severity ratings indicated that level 2 (moderate problems) accounted for the largest proportion. User evaluation was conducted with disaster management practitioners from a local public enterprise in Seoul, who completed representative task scenarios and the System Usability Scale (SUS). The average SUS score was 24.6, placing KRMS in the “Not Acceptable” range in international benchmarks. Key difficulties included complex procedures, overly segmented menu structures, and low intuitiveness, suggesting that structural and procedural complexity constrains usability in real work contexts and informing future system improvement and policy considerations.

Based on the software quality evaluation framework, this study examines determinants affecting user satisfaction of a learning management system, which is a versatile web-based educational tool. In particular, we explore five quality attributes (capability, usability, performance, reliability, and documentation) of a learning management system in both the PC context and the smartphone context. A data from a survey with 213 students was analyzed by an ordered logit regression. The findings show that in the PC context, capability, usability, and reliability significantly affect user satisfaction, and usability has the greatest influence; in the smartphone setting, performance as well as the three dimensions has significant influence on user satisfaction, and usability and reliability have strong influence. Documentation has no significant impact on user satisfaction of learning management systems in both contexts.

The focus of Enterprise Architecture (EA) efforts has been on business architecture, technology architecture, data Architecture, application architecture and their integration. However, lesser amount of attention has been given to one of the most critical EA element; Users (Human capital of enterprise; commonly referred as stakeholders). As a result, existing EA Management Systems (EAMS) have become Old-Big content-centric document-repositories which are unable to provide meaningful information about user’s needs and their functional scope so that to develop technological solutions to meet those requirements. In order to address this critical issue we argue that a User-centric approach, supported by semantic technology, has the potential to represent a new and improved way of practicing this discipline. In this context, we present a novel ontology-based strategy named as User-centric Semantic-oriented EA (U-SEA) framework. Based on this framework we develop User-centric Semantic-oriented Enterprise Architecture Management (U-SEAM) approach composed of a knowledge-based repository and a recommender system with special emphasize on reasoning-based mechanisms. Our approach is generic enough to be used in a wide variety of User-centric EAM applications. The obtained results show computational feasibility to manage and govern EA as well as reduce complexity with respect to existing EAM approaches.

본 연구는 경주국립공원의 지구유형별 특성에 따른 관리정책에 대한 이용자의 인식 차이를 비교해 보고자 경주국립공원을 방문한 이용자를 대상으로 2012년 7월에서 8월까지 설문조사를 실시하였다. 경주국립공원 이용자의 특성, 이용행태, 공원관리정책에 대한 인식을 조사항목으로 설정하였다. 먼저, 경주국립공원 8개 지구의 주요자원과 탐방객의 이용특성을 기준으로 지구유형을 분류하였다. 불국사와 석굴암을 주요 자원으로 주로 경관감상 및 휴양을 위한 관광을 목적으로 하는 이용객들이 많이 찾는 토함산 지구는 관광형, 역사문화 학습과 환경 교육을 위한 탐방객들이 많이 찾는 남산과 대본지구는 역사문화교육형으로 분류할 수 있었으며, 남은 화랑, 서악, 소금강, 구미산 지구는 건강증진을 위한 체력 단련, 등산, 산책이 주목적으로 주민들이 많이 이용하는 공간으로 근린공원형으로 분류할 수 있었다. 관광형의 경우, 문화유적탐방을 위한 이용자가 집중되는 곳으로 이용자제한 정책을 통해 탐방객들의 만족도를 높일 수 있는 방안에 대해 고려해야 할 것으로 판단되었고, 역사문화교육형은 이용행위규제 방법에서 관리자 단속권한이 강화될 필요성이 있다고 인식하고 있었다. 반면, 근린공원형 지구의 이용자들은 대부분의 정책에 대해 가장 낮은 필요도를 느끼고 있었는데, 이러한 결과들을 통해 경주국립공원은 각 지구별로 이용자들이 느끼는 정책의 필요도가 다르다는 것을 알 수 있었다. 이러한 결과는 향후 경주국립공원의 지구별 이용자의 인식 차이를 반영한 정책 도입에 기초자료로 활용할 수 있을 것으로 기대된다.

The survey was taken from July to August 2012 by users who visited Gyeongju National Park to compare the perceived gap of users regarding management policy by characteristic of Gyeongju National Park district type in this study. Gyeongju National Park users' characteristic, use pattern and perception regarding park management policy were created as survey items. First, district type was classified based on use pattern of the visitor and the key resources of 8 districts in Gyeongju National Park. Tohamsan District, which has many visitors for the purpose of scenery appreciation and recreation with Bulguksa and Seokguram Grotto, is classified as tourism type, Namsan and Daebon District, which bring in many visitors seeking to learn about historical culture and environmental education, could be classified as historical culture education types, and Hwarang, Seoak, Sogeum River, Gumisan District are places residents use for physical training, hiking and walking to improve health, thus classifying them as neighborhood park types. People perceived that the tourism type is where users for historical artifact tours are concentrated, thus consideration for plans that can improve visitors' satisfaction from a user limit policy is required, and a manager's right to control use behavior must be reinforced in historical culture education types. On the other hand, users of neighborhood parks found the lowest necessity for most of the policy, and this showed that users of each of Gyeongju National Park's districts felt differently about the need for policies. This result is expected to be utilized as a database for introducing policy that reflects the perception of users in each districts of Gyeongju National Park in the future.

본 연구는 이용객의 올바르지 못한 행위로 일어나는 관광지의 훼손을 방지하기 위해 공원녹지 분야의 이용자 관리 중 커뮤니케이션 기법의 이용 관리에 관한 정보 제공을 제시하고 이를 도입하기 전 관광지에서의 적용 가능성을 살펴보고자 하였다. 그와 더불어 관광지 관리 및 훼손행위 규제, 훼손행위 감소를 위한 이용자관리 수용 여부 등 이용자관리에 관한 관광객의 인식을 파악하였다. 본 연구결과에 따르면 이용객들은 관광지 훼손의 심각성을 인지하며, 훼손행위가 관광지 만족도에 영향을 미침에 따라 규제의 필요성에 대해 긍정적으로 대답하였다. 특히, 이용 관리 정보와 관련하여 이용 관리 정보 제공 유무에 따라 자원훼손에 대한 책임인식이 다른 것으로 나타났는데, 정보를 제공받은 집단이 제공받지 못한 집단에 비하여 환경 및 자원훼손에 대한 책임인식이 높게 나타나 앞으로 자원훼손 예방에 있어 이용 관리 정보가 중요한 요인으로 파악되었다. 또한, 그와 더불어 이용자 관리 중 법적 규제, 관리사무소의 계도 등도 적극적으로 수용할 것으로 나타나 앞으로 관광지 차원의 이용자 관리방안 정립이 필요한 것으로 나타났다.

The purpose of this paper is to devise a user management plan for tourism destinations in parts of park and open green spaces to prevent resource damage through depreciative behavior by tourists. Also, the possibility of the introduction of user management has been considered in order to complement this in these kinds of park and open green spaces. As explained in prior results, tourists have had the opportunity of taking part in many experiences which furnish cultural and historical information, but have never had experiences which furnish information in utilization and management such as prohibited behavior at tourism destinations, responsibility for damage, etc. The furnishing of information on utilization and management plays an important role in understanding responsibility in resource damage. For example, groups who have been given information on utilization and management appear to be much more responsible toward resources and environmental damage. For this reason, this must be a very important element for preventing damaging behavior at tourism destinations. Tourists can be made to understand that tourism destinations can be very seriously damaged by users. In order to control these damaging behaviors which occur from other users and to meet the needs of the tourism destinations being visited, it is necessary to establish a user management plan.

본 연구는 공공도서관의 ESG경영이 도서관 인식, 이용자 만족도 및 재이용 의도에 영향을 미치는가를 파악하기 위해 연구모형을 설계하고 검증하였다. 이를 위해 서울지역 25개와 경기지역 6개 등에서 도서관을 이용하는 이용자를 대상으로 설문조사를 실시하여 유효표본 247부를 연구에 사용하였다. 분석 결과, ESG경영의 환경과 사회는 도서관 인식과 이용자 만족도에 정(+)의 영향을 미치는 결과를 보였으며, 도서관 인식은 이용자 만족도와 재이용 의도에 정(+)의 영향을, 마지막으로 이용자 만족도는 재이용 의도에 정(+)의 영향을 미치는 것으로 확인되었다. 결과적으로 ESG경영이 도서관 인식, 이용자 만족도 및 재이용 의도에 영향을 미침으로서 일상적인 삶 속으로 확장된 효과를 다양하게 공공도서관에 반영되는 것으로 추론할 수 있다. 또한 도서관은 이용자들에게 윤리적이고 도덕적인 의미가 상대적으로 크기 때문에 ESG경영을 통해 긍정적이고 진정성 있는 만족도를 제공한다면 이용자들의 재이용 의도를 보이는 것을 확인할 수 있다. 도서관에 도움이 될 수 있는 전략과 개선방안을 제시하였다는 점에서 실무적으로 의의를 지닌다.

In this study, we designed and verified a research model in order to determine whether ESG management for public libraries affects the perception of libraries, user satisfaction, and the intention to revisit. A survey was conducted among the users of six public libraries in the Gyeonggi region and 25 libraries in Seoul, and 247 valid responses from the survey were analyzed. The analysis revealed that the environment and society factors of ESG management had a positive effect on the perception of libraries and user satisfaction. It also showed that the libraries' perception had a positive impact on user satisfaction and the intention to revisit, and user satisfaction showed a positive correlation for the intention to revisit. From the analysis, we can infer that the effects of ESG management were reflected in everyday life via public libraries as ESG management of the public libraries influenced the perception of libraries, user satisfaction, and the intention to revisit. We confirmed that users showed the intention to revisit if the library provides positive and sincere satisfaction through ESG management, due to public libraries having ethical and moral significance to users. We have also put forward practical marketing strategies and identified areas for enhancement that can prove beneficial to public libraries.

개방형 운영체제인 리눅스는 전통적인 웹, 메일, DNS, FTP 등의 서버뿐만 아니라, 클라우드 및 빅데이터 인프라 구축에도 사용되고 있다. 또한 데스크톱이나 모바일 기기, 스마트 TV 및 자동차 등에도 탑재되고 있다. 특히, 사물인터넷 시대로 접어드는 현 시점에서는 리눅스가 차지하는 비중이 더 커질 것으로 예상되고 있다. 리눅스의 사용이 증가함에 따라 보안이 중요한 요소로 부각되고 있고, 리눅스 시스템 보안의 핵심은 사용자 관리에 있다. 본 논문에서는 리눅스의 사용자를 분류하고, 사용자 관련 파일의 역할을 분석하였다. 마지막으로 리눅스의 사용자별 보안 관리 기법에 대해 알아보고, 유용한 사용자 보안 도구에 대해 분석하였다.

Open operating system, Linux is the traditional Web, E-mail, DNS, FTP server, as well as being used in Cloud and Big data infrastructure. In addition, Linux is also used like a desktop or mobile devices, smart TV and cars. In particular, stepping up to the IoT era at this time is expected to be greater proportion occupied by Linux. As the use of Linux has increased security has emerged as an important factor. User management is core of Linux system security. In this paper, Classifying Linux user and analyzed the role of the user-specific file. Finally, we analyzed the linux management technologies and useful user security tools.

이 연구는 의학도서관 이용자의 대출기록을 이용하여 자료이용행태를 분석하고 이를 통해 이용자를 위한 효율적인 장서구성과 도서관서비스 개선에 목적이 있다. 이를 위해 A 의학도서관에서 2012년부터 2014년까지 최근 3년간 발생한 대출기록 90,420건의 신분별/주제별 대출 통계와 상위 대출빈도 도서, 상호대차 서비스 이용 데이터를 수집하여 분석하였다. 연구 대상은 학부생과 대학원생, 교수직, 수련직, 일반직을 포함한 병원 직원을 대상으로 하였다. 그 결과, 의학도서관 이용자들은 기술과학 분야의 자료와 문학자료, 사회과학 분야 자료를 집중적으로 대출하였다. 특히 장서구성대비 문학자료에 대한 요구가 상대적으로 다른 주제 영역에 비해 높았다.

The aim of this study is supporting efficient development of library collection and improvement of library service for users by analyzing utilization patterns of library collection using circulation statistics of medical library users. With this purpose, circulation statistics were extracted from 90,420 cases of circulation records in A library for recent 3 years (from 2012 to 2014). Specifically, circulation data categorized according to status and subject, loan data of most popular books and use data of inter-library loan service were collected and analyzed. Subject groups of this study are undergraduate students, graduate students and incumbent hospital employees including faculty members, training members and nondoctor members. For the result, medical library users intensively lent materials of Technology (Applied Sciences), Literature and Social science areas. Especially, the demand of the materials of literature was higher than the demand of the other subject areas compared in the base of collection development.

중앙 집중형 이동성 관리 프로토콜인 PMIPv6은 모든 제어 트래픽과 데이터 트래픽을 함께 처리하는 local mobility anchor (LMA)에 전적으로 기반하여 동작하기 때문에 코어망으로의 방대한 트래픽 집중 현상 및 삼각 라우팅(triangle routing) 등의 심각한 문제점을 안고 있다. 따라서, 본 논문에서는 이러한 문제점들을 완화시키고자, 이동 사용자별 traffic locality를 고려한 PMIPv6 기반의 향상된 분산형 이동성 관리 기법을 제안한다. 성능 분석 결과, 이동 사용자가 거의 통신없이 상대적으로 이동성만 매우 큰 특수한 경우를 제외한 대부분의 경우에 있어, 제안 기법이 PMIPv6보다 매우 우수한 성능을 보임을 입증하였으며, 병목현상에 빠지기 쉬운 코어망의 LMA의 부하를 에지망의 mobile access gateway (MAG)들로 분산시킬 수 있는 효과적인 대안이 될 수 있음을 확인하였다.

Proxy mobile IPv6 (PMIPv6), which is a centralized mobility management protocol, are dependent on a local mobility anchor (LMA) to process all control and data traffics. Therefore, it has serious problems such as the tremendous traffic concentration into the core network and the triangle routing. In this paper, therefore, in order to alleviate these drawbacks, we propose a PMIPv6-based enhanced distributed mobility management scheme considering a user's traffic locality. Performance evaluation results indicate that in most cases, except for when a user's mobility rate is relatively very higher than the traffic rate, the proposed scheme shows better performance result than that of PMIPv6. Besides, it is demonstrated that the proposed scheme can be an effective alternative that can distribute the significant loads on the LMA of the core networks to the MAGs of the edge networks.

Background : The use of paper-based prescriptions has presented ongoing challenges, including high storage and disposal costs. To address these issues and enhance efficiency, Samsung Medical Center developed e-PIMS, launched in 2022 as Korea’s first electronic pharmacy management system enabling real-time prescription tracking. This system digitizes pharmacy operations by integrating patient and medication data to optimize workflow. This study aims to evaluate e-PIMS’s operation and user satisfaction, providing foundational data for future improvements and adoption. Methods : The pharmacy department conducted an online satisfaction survey for pharmacists using e-PIMS, which was implemented in November 2022. The survey consisted of 8 questions and was conducted over 3 days, from October 14 to 16, 2024. Results : The survey achieved a response rate of 57.9% (80 participants). Regarding workflow improvement, the statement “Using e-PIMS is easier to manage and store than paper prescriptions” received the highest satisfaction score of 4.8 (±0.51). This was followed by “e-PIMS provides easier access to drug information” at 4.7 (±0.54), “e-PIMS reduces processing time compared to paper prescriptions” at 4.5 (±0.72), “e-PIMS makes it easier to track prescription audit history” at 4.1 (±0.72), and “e-PIMS helps prevent dispensing errors” at 3.8 (±0.91). Most items scored above 4.0, indicating positive feedback. In terms of usability, “e-PIMS is easier to learn than paper prescriptions” received the highest score of 4.6 (±0.49), followed by “e-PIMS is less prone to errors compared to paper prescriptions” at 3.8 (±0.71), and “I strongly recommend using e-PIMS” at 4.5 (±0.72). Conclusion : The study confirms that implementing e-PIMS effectively improves prescription management and enhances the efficiency of prescription review processes. The satisfaction survey results reveal positive feedback from users regarding workflow improvements and usability, demonstrating that e-PIMS successfully reduces unnecessary workloads and processing times.

연구의 목적은 공공도서관과 이용자 간 커뮤니케이션 및 경험을 분석하여 이용자 만족도에 영향을 미치는 요인을 파악하는 것이다. 현재 경영 및 마케팅 분야에서 다양하게 활용하고 있는 고객 경험 관리(CEM)를 적용하여 이용자의 경험을 세분화하여 분석하고자 한다. 이용자의 경험에 대한 접점을 도출하기 위하여 마케팅, 경영 분야의 CEM 연구를 검토하여 물리적 환경, 인적 요인, 커뮤니케이션, 서비스를 독립변수로 설정하고 감정적 즐거움을 매개변수, 이용자 만족을 종속변수로 설정하여 설문 문항을 구성하였다. 설문 방법은 온라인 및 오프라인(대면) 2가지 방법으로 실시하였으며 수집된 총 60개의 설문지를 기반으로 통계분석을 진행하였다. 연구 결과는 이용자의 물리적 환경과 편의성에 대한 경험이 높을수록 만족도가 높게 나타났으나 도서관 접근성은 크게 영향을 주지 않았다. 또한, 도서관 직원 태도나 문제해결능력은 이용자의 만족에 큰 영향을 미치며, 이때 친절함보다는 문제해결 능력이 더 중요한 영향을 주었다. 이때 정서적 즐거움은 매개효과를 가지는 것으로 나타났다.

This study aims to analyze communication and experiences between public libraries and to identify these factors affect user satisfaction. Customer experience management (CEM), which is currently used in various fields of management and marketing, was applied to segment and analyze user experiences. After reviewing CEM research in marketing and management to derive user experience points, set physical environment, human factors, communication, and service as independent variables, emotional pleasure as parameters, and user satisfaction as dependent variables. Based on this, questionnaire items were constructed. The survey method was conducted in two ways, online and offline (face-to-face), and statistical analysis was performed based on a total of 60 questionnaires collected. The results indicate the higher the user's experience with the physical environment and convenience, the higher the satisfaction level, but library accessibility had no significant effect. In addition, library staff attitude and problem-solving ability had a great influence on user satisfaction, and problem-solving ability had a more important influence than kindness and emotional pleasure was found to have an mediating effect.

본 연구에서는 건설 기록정보관리시스템 만족도에 영향을 미치는 요인간의 인과관계를 분석하기 위해 A건설회사에서 자체적으로 구축 개발된 건설 기록정보관리시스템을 사용해 본 경험이 있는 종사자 129명을 대상으로 설문조사를 실시하였다. 외부변수로는 시스템품질, 정보품질, 서비스품질을 선정하였으며 인지된 이용의 용이성, 인지된 유용성을 매개변수로 선정하였다. 종속변수로는 시스템의 만족도를 선정하여 외생변수 및 매개변수가 종속변수에 어떻게 영향을 미치는지에 대해 구조방정식을 적용하여 분석하였다. 연구결과 시스템품질은 인지된 이용의 용이성, 인지된 유용성 및 만족도에 직 간접적으로 모두 유의미한 영향을 미쳤으며 정보품질은 인지된 이용의 용이성에만 직접적으로 영향을 미치는 것으로 나타났다. 서비스품질은 통계적으로 유의미하게 영향을 미치지 않는 것으로 나타났다.

To be able to present authenticity, or to cope with patent related cases or any possible law suite for intellectual. The purpose of this study was to investigate factors affecting the satisfaction of records and information management system on the construction industry. Data was collected through a survey of 129 employees who work for A engineering company. Independent variables in this study included system quality, information quality, and service quality. Latent variable was selected as easy of use and usefulness. Dependent variable was user's satisfaction for the system. The results of analysis of structural equation modeling showed that system quality was found to have both direct and indirect impacts on user's satisfaction. On the other hand, information quality was significant only in direct impact on ease of use. Service quality was not statistically significant in the effect on user's satisfaction.

광대역 네트워크의 발달과 함께 멀티미디어 산업의 발달은 IPTV와 같은 디지털 콘텐츠 시장의 확산을 가져오고 있다. IPTV는 TV와 PC의 장점을 융합시켜 멀티미디어 콘텐츠를 보다 쉽고, 편리하게 제공할 수 있어 여러 서비스가 상용화 되고 있다. 기존의 IPTV 서비스는 일반 사용자를 위한 VoD기반의 서비스에 초점을 맞추어 왔다. 그러나 서비스의 용도가 다양해짐에 따라 장소, 특성, 사용자에 맞는 IPTV 서비스가 필요하다. 본 논문에서는 사용자 맞춤형 채널관리를 이용한 다운로드기반의 IPTV 서비스를 제안하고 이를 설계하였다. 먼저 콘텐츠를 사용자가 작성한 맞춤형 채널대로 미리 다운로드를 한 후 셋탑박스 내에서 채널 내에 구성된 시간대가 되면 재생하는 방식으로 IPTV 특성대로 원하는 시간에 원하는 콘텐츠를 제공받을 수 있다. 또한 콘텐츠에 대한 시간별 분산 다운로드를 통하여 서비스의 안정성을 높일 수 있다. 이것은 일반 IPTV보다 적은 비용으로 서비스 구축 및 유지관리가 가능하기 때문에 기반시설이 미비한 사업체에 보다 적합하고 특정 목적에 이용할 수 있는 서비스 모델이다. 본 논문에서는 제안한 시스템을 위해 필요한 요소들을 알아보고 프로토콜을 정의함으로써 개발자들이 시스템 구축에 도움이 되도록 설계해 본다.

While the broadband network and multimedia technology are being developed, the commercial market on digital contents as well as IPTV has been widely spreading. Especially IPTV is providing various useful services since it makes using multimedia contents easier and more convenient by combining the strong points of both TV and PC system. Until now, IPTV system has been focused on VoD service as a general usages. However, various IPTV services are recently demanded since they can have special features for some specific places and occasions. So in this paper, we propose a design of the download based IPTV system using user-specific channel management. At first, program contents previously scheduled by users are downloaded and are played at settop-box according to the prescribed time table. This system has some advantages of giving users easy access to any wanted media contents in anytime that is IPTV's characteristics. And we can increase stability of services by using time slot distributed download for contents. Because this service can be constructed and maintained at relatively low cost, we confirm that this service model is more suitable to some companies with small infrastructure and special purposes. Accordingly, in this paper, we look into necessary elements and define some protocols for system in order to help other developer build this system.

This Study aims at identifying factor and variables which have significant effects on user satisfaction with recreational resources and facilities in Juwang National Park and there-by establishes indicies of planning and / or management of the park. To test the causal models of this research, the data was gathered by self-administered questionnaires from users in Juwang National Park. The analysis of the data was conducted in two phases. The first analysis dealt with exploratory gactor analysis which identified major factors involved in satisfaction with recreational facilities in Juwang National Park. The second analysis tested the fit of causal models of this research to the data using LISREL methodology. The factor analysis identified six significant factors in satisfaction with recreational resources, The six factors are convenient park facilities, natural landacape resources, linear park facilities, mineral springs and Buddhist temples, commercial and sleeping accommodations, rest areas and open space for passive recreational activity. The second phase analysis tested the fit of the causal model for satisfaction with recreation facilities to the data. The phase identified statistically significant causal links among overall satisfaction with the park, and other indigenous factors and exogenous variables. From these causal relationships, implications for future management of Juwang National Park were suggested.

최근에 분산ID관리처럼 개인정보를 주체적으로 관리하는 기술이 주목받고 있지만, 기존에 제시된 블록체인 기반의 접근제어 연구들은 사용자에게 충분한 수준의 개인정보 접근제어 방안을 제공하지 못하고 있다. 본 논문은 퍼미션 블록체인 기술과 표준화된 프라이버시 보호 기술을 결합한 방안을 제안한다. 사용자의 접근제어 개입을 위해 프라이버시 제어 표준인 UMA2를 준용하는 토큰 기반의 사용자 접근제어 서비스를 블록체인 분산어플리케이션에 적용하였다. 블록체인과 UMA2를 연동함으로써 기존 블록체인이 제공하지 못했던 사용자 중심의 접근제어 기능을 제공한다. 또한 UMA2의 단점인 엔터티의 프라이버시 문제와 보안성, 가용성 이슈를 해결하였다.

Recently, user-driven privacy control technology, such as distributed ID management, has been gaining attention. However, the existing blockchain-based access control studies have not provided a sufficient level of privacy control method to users. This paper proposes a method that combines permissioned blockchain technology and a recent privacy control standard. To allow users to participate in privacy control, a token-based user access control service that conforms to the UMA2 standard was applied to the blockchain dApp. By combining the blockchain and UMA2, the proposed method provides a user-centered privacy control function that the existing blockchain could not provide. In addition, we solved the problem of privacy, security, and availability of entities, which are the disadvantages of UMA2.

The purpose of this study is to establish the databases of pollutant sources and water quality measurement data by utilizing GIS, and making the user interface for the management of pollutant sources. Yeongsan Estuarine Lake was formed of a huge levee of 4.35 km constructed by an agricultural reclamation project. Water quality of the reservoir has been degraded gradually, which mainly attributes to increase of point and non-point source pollutant loads from the lake's watershed of 33,374.3 $\textrm{km}^2$ into it. Application of GIS to establishment of the database was researched of pint source such as domestic sewage, industrial wastewater, farm wastes, and fishery wastes, and non-pont source such as residence, rice and upland field, and forest runoffs of the watershed of the lake. NT Acr/Info and ArcView were mainly utilized for the database formation. Land use of the watershed using LANDSAT image data was analyzed for non-point source pollutant load estimation. Pollutant loads from the watershed into the reservoir were calculated using the GIS database and BOD, TN, TP load units of point and non-point sources. Total BOD, TN, TP loads into it reached approximately to 141, 715, 2,094 and 4,743 kg/day respectively. The loads can be used as input parameters for water quality predicting model of it. A user-friendly interface program was developed using Dialog Designer and Avenue Script of AcrView, which can perform spatial analysis of point and non-point sources, calculate pollutant inputs from the sources, update attribute data of them, delete and add point sources, identify locations and volumes of water treatment facilities, and examine water quality data of water sampling points.