• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제8권3호
• /
• pp.857-872
• /
• 2014

Recent researches reveal that great benefit can be achieved for data gathering in wireless sensor networks (WSNs) by employing mobile data collectors. In order to balance the energy consumption at sensor nodes and prolong the network lifetime, a multi-track large-scale mobile data collection mechanism (MTDCM) is proposed in this paper. MTDCM is composed of two phases: the Energy-balance Phase and the Data Collection Phase. In this mechanism, the energy-balance trajectories, the sleep-wakeup strategy and the data collection algorithm are determined. Theoretical analysis and performance simulations indicate that MTDCM is an energy efficient mechanism. It has prominent features on balancing the energy consumption and prolonging the network lifetime.

• International Journal of Knowledge Content Development & Technology
• /
• 제14권1호
• /
• pp.75-110
• /
• 2024

The study was meant to examine electronic theses and dissertations' development in Nigerian federal university libraries. The study adopted descriptive survey research design. The study population comprised forty-eight institutional repository librarians in eighteen Nigerian federal university libraries. The sample consisted of forty three librarians. A questionnaire was used for data collection. The data collected were analyzed with mean and standard deviation. Findings reveal that the policies available for developing electronic theses and dissertations (ETDs) in the libraries require submission of electronic copies of theses and dissertations by students, participation of digital/IR librarians in ETD development and provision of free access to ETDs; the libraries comply with standards of Open Archives Initiative Protocol for Metadata Harvesting and Search/Retrieval via URL using DSpace for building ETDs and taking advantage of such available ICT facilities as computers, scanners, CD-ROM, LAN, internet connectivity and printer. The libraries achieve ETD through digitisation, mandating submission of electronic versions of TDs by students and creation of IR. However, the process is hindered by technological obsolescence, financial problems, absence of clearly-defined ETD development policy, required ICT facilities and trained staff, copyright, irregular power supply and unstable internet connectivity. This study represents a fresh empirical investigation into electronic theses and dissertations' development in federal university libraries in Nigeria.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2004년도 추계학술대회 논문집 Vol.17
• /
• pp.444-447
• /
• 2004

A heart diagnosis system adopts hundreds of Superconducting Quantum Interface Device(SQUID) sensors for precision MCG(Magnetocardiogram) or MEG(Magnetoencephalogram) signal acquisitions. This system requires correct and real-time data acquisition from the sensors in a required sampling interval, i.e., 1 mili-second. This paper presents our hardware design and test results, to acquire data from 256 channel analog signal with 1-ksample/sec speed, using 12-bit 8-channel ADC devices, SPI interfaces, parallel interfaces, and 8-bit microprocessors. We chose to implement parallel data transfer between microprocessors as an effective way of achieving such data collection. Our result concludes that the data collection can be done in 250 ${\mu}sec$ time-interval.

• 한국문헌정보학회지
• /
• 제33권1호
• /
• pp.23-48
• /
• 1999

우리 나라 대학도서관의 정보기술 도입현황과 정보기술이 국내 대학도서관의 장서개발에 미치는 영향을 조사하였으며, 이러한 영향과 전자정보서비스 제공과의 관계를 분석하여 전자정보서비스 제공의 영향을 반영한 대학도서관의 장서개발 방향을 제시하였다. 이를 위하여 전국의 4년제 일반대학 134개교의 중앙도서관을 대상으로 1997년 12월 15일부터 1998년 1월19일까지 약 한 달간에 걸쳐 설문조사를 실시하였으며, 그중 회수된 유효자료 99부를 분산분석하였다.

• 한국문헌정보학회지
• /
• 제27권
• /
• pp.161-181
• /
• 1994

As information technologies are applied to the libraries in information society, the library services have been changing its feature. Therefore, the purpose of this paper is to explore and to establish a paradigm of the library services in information society. It is hypothesized that the application of information technologies leads to the change of the library services in information society. To prove the hypothesis, the data were collected from various research results carried out in the developed countries and by observing various libraries where the information technologies are extensively applied. The findings are as follows: 1. As information technologies are applied to the library, many new library services emerge for the society. 2. As the electronic data replace the paper data, the collection of a library becomes the collection of the libraries in the world. Therefore, the accessibility to the information network is more important than to own information in the library. Librarians select various electronic data according to the library policy which distinguishes their own library collection from others. The policy also solves the various problems related to weeding and preserving library collection. And the use of CD-ROM selection tools enable library users to select their own data. Now, the censorship becomes the concems of the library users, not the library. 3. The catalogs are reorganized for the electronic data for the international use. The most important information in the catalog is the location of the data and the multi access to the data are necessary. 4. As the information technologies are applied in book selection, cataloguing, information retreival and circulation, the library users are enable to service themselves in the library. And most of the routine works related to the information service are taken over by the library staffs. Professional librarians engage in user education, information marketing and fund raising. 5. Public libraries in information society serves those who have no access to the information. They help the illiterates. patients in the hospital, prisoners, and homeless in the city. Therefore, the information technologies enhance the role of librarians in professional work in the library as well as in the information society.

• 전자공학회논문지
• /
• 제49권12호
• /
• pp.149-155
• /
• 2012

SSD(Solid State Disk)는 다수의 NAND 플래시 메모리로 구성되었으며 내부에 고성능 컨트롤러와 캐시 버퍼를 포함한 스토리지 장치이다. NAND 플래시 메모리는 제자리 덮어쓰기가 안되기 때문에 파일시스템에서 유효페이지가 갱신 및 삭제시 무효페이지로 전환되어 완전히 삭제하기 위해서는 가비지 컬렉션 과정을 거쳐야한다. 하지만 가비지 컬렉션은 지연시간이 긴 Erase 연산을 포함하기 때문에 SSD의 I/O 성능을 감소시키고 마모도를 증가시키는 문제가 된다. 본 논문에서는 입력데이터에 대하여 유효데이터와 무효데이터에서 중복검사를 실행하는 기법을 제안한다. 먼저 유효데이터에 대한 중복제거 과정을 거치고 그 다음에 무효데이터 재활용 과정을 거침으로써 중복률을 향상시켰다. 이를 통하여 SSD의 쓰기 횟수와 가비지 컬렉션 횟수를 감소시켜 마모도와 I/O 성능이 개선되었다. 실험결과 제안한 기법은 유효데이터 중복제거와 무효데이터 재활용을 둘다 하지 않는 일반적인 경우에 비해서 가비지 컬렉션 횟수가 최대 20% 감소하고 I/O 지연시간이 9% 감소하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제13권12호
• /
• pp.5805-5825
• /
• 2019

Smartphones are important platforms because of their sophisticated computation, communication, and sensing capabilities, which enable a variety of applications in the Internet of Things (IoT) systems. Moreover, advancements in hardware have enabled sensors on smartphones such as environmental and chemical sensors that make sensor data collection readily accessible for a wide range of applications. However, dynamic, opportunistic, and heterogeneous mobility patterns of smartphone users that vary throughout the day, which greatly affects the efficacy of sensor data collection. Therefore, it is necessary to consider phone users mobility patterns to design data collection schedules that can reduce the loss of sensor data. In this paper, we propose a mobility-based weighted adaptive opportunistic scheduling framework that can adaptively adjust to the dynamic, opportunistic, and heterogeneous mobility patterns of smartphone users and provide prioritized scheduling based on various application scenarios, such as velocity, region of interest, and sensor type. The performance of the proposed framework is compared with other scheduling frameworks in various heterogeneous smartphone user mobility scenarios. Simulation results show that the proposed scheduling improves the transmission rate by 8 percent and can also improve the collection of higher-priority sensor data compared with other scheduling approaches.

• Journal of the Korean Data and Information Science Society
• /
• 제14권4호
• /
• pp.817-824
• /
• 2003

We employed a hierarchical document classification method to classify a massive collection of electronic medical records(EMR) written in both Korean and English. Our experimental system has been learned from 5,000 records of EMR text data and predicted a newly given set of EMR text data over 68% correctly. We expect the accuracy rate can be improved greatly provided a dictionary of medical terms or a suitable medical thesaurus. The classification system might play a key role in some clinical decision support systems and various interpretation systems for clinical data.

• 한국도서관정보학회지
• /
• 제54권4호
• /
• pp.1-24
• /
• 2023

본 연구는 학령인구 감소와 지방대학의 위기 상황에서 소규모 대학도서관의 장서 및 대출 이용 현황을 전국 대학도서관과 정량적으로 비교함으로 소규모 대학도서관을 위한 장서개발 지침의 근거를 제시하고자 하였다. 학술정보통계시스템에서 2010년부터 2022년까지의 통계치를 추출하여 4년제 대학도서관의 평균과 소규모 대학도서관의 재학생 수, 장서 수, 도서대출 수, 전자자료 이용건수 현황을 연도별, 권역별로 증가율, 1인당 이용량, 장서회전율, 연평균증가율로 비교·분석하였다. 분석결과 재학생 수는 전국 대학과 소규모 대학 모두 감소한 반면, 장서 수는 전국 대학도서관보다 소규모 대학도서관의 증가율이 30% 이상 높았다. 도서 대출 수는 두 그룹 모두 약 75% 감소하였고 전자자료 이용량은 230% 이상 대폭 증가하였다. 상관관계분석에서도 동일한 추세를 보이는데, 대출이 감소하면 전자자료 이용이 증가하였고 소규모 대학도서관은 증가치가 더 높았다. 소규모 대학도서관의 장서개발을 위해 전자자료 구입비 예산비율을 대폭 확대 조정이 필요하며 소규모 대학도서관간의 특성별 전자자료 공동이용을 위한 컨소시엄을 제안하였다.

• 한국건설관리학회:학술대회논문집
• /
• 한국건설관리학회 2006년도 정기학술발표대회 논문집
• /
• pp.181-186
• /
• 2006

Estimation based on current data of construction performances have become one of the critical subjects which many researchers have been interested in for the past decades. In order to accomplish accurate measurement and estimation of construction performances, the method of data collection stands the highest priority. However, there are many difficulties in data collection from construction jobsite due to the characteristics of the construction industry. With developments of new technologies in other industries, several technologies has recently initiated to be applied to construction field. Electronic tags based on the identification technology, automatic volume measurement based on laser scanning technology, and Global Positioning System (GPS) have been represented the technologies which show the high opportunity for being used in construction. This study reviews specific aspects of these technologies focused on the utilization in construction jobsite. Also, the challenges which these technologies need to overcome are discussed.