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Spark 기반의 분산 시간 count-min 스케치 기법
Fadhilah Kurnia Putri,안성아,권준호 한국정보과학회 2017 데이타베이스 연구 Vol.33 No.1
Due to the rapid development of Internet of Things (IoT) technologies, large volumes of traffic data are generated from IoT sensors. One of the crucial applications is to answer top-K queries over data stream from IoT devices. In this paper, we extended the existing temporal count-min sketches in a distributed mode: CM-Sketch on sliding window (CMSS) and Exponential-CM Sketch (ECM). These two techniques are implemented on a Spark engine and utilized for answering the approximate top-k query processing over taxi trip dataset. Our experimental results shows that CMSS performs better than ECM in terms of the memory consumption and execution time, whereas ECM produce more accurate results than CMSS. 사물 인터넷 (Internet of Things, IoT) 기술의 급속한 발전으로 인해 많은 양의 교통 데이터가 다양한 IoT 센서로부터 생성된다. 중요한 응용 중의 하나는 IoT 디바이스로부터 생성된 데이터 스트림에 대한 top-k 질의에 대한 답을 구하는 것이다. 이 논문에서는 기존의 시간 count-min 스케치를 분산 모드로 확장한 슬라이딩 윈도우에 기반한 count-min 스케치 기법(CMSS)와 지수 count-min 스케치 기법 (ECM)을 제안한다. 이 두 기법은 Spark을 이용하여 구현이 되었으며, 택시 여행 데이터 셋에 대한 근사 top-k 질의처리를 위해 사용한다. 실험 결과를 통해 CMSS 기법이 메모리 소비 및 실행 시간 측면에서 ECM 기법 보다 우수하고, ECM 기법은 CMSS보다 더 정확한 결과를 반환하는 것을 보인다.
( Fadhilah Kurnia Putri ),안성아 ( Seong A An ),( Magdalena Trie Purnaningtyas ),정한유 ( Han You Jeong ),권준호 ( Joonho Kwon ) 한국정보처리학회 2015 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.4 No.9
IoT(사물인터넷) 기술의 빠른 개발로 인하여 기존의 택시들은 디스패처와 위치 시스템을 통해 서로 연결되고 있다. 일반적으로 현대의 택시들은 경로 정보를 획득하기 위한 목적으로 GPS(Global Positioning System)를 탑재하고 있다. 택시 운행 데이터들의 경로 빈도를 분석하여, 주어진 질의 시간에 해당하는 빈번한 경로를 찾을 수 있다. 그러나 위치 데이터의 용량이 매우 크고 복잡하기 때문에 택시의 운행 이벤트의 위치데이터를 분석된 빈도 정보로 변환할 때에 확장성 문제가 발생한다. 이 문제를 해결하기 위하여, NoSQL 데이터베이스에 기반한 택시 운행 데이터에 대한 Top-K 질의 시스템을 제안한다. 첫째, 원시 택시 운행 이벤트를 분석하고 모든 경로들의 빈도 정보를 추출한다. 추출한 경로 정보는 NoSQL 문서-지향 데이터베이스인 MongoDB에 해시 기반의 인덱스 구조로 저장한다. 주로 발생하는 경로에 대한 효율적인 Top-K 질의 처리는 몽고DB의 상에서 이루어진다. 미국 뉴욕시의 실제 택시 운행 데이터를 이용한 실험을 통하여 알고리즘의 효율성을 검증하였다 Due to the rapid development of IoT(Internet of Things) technology, traditional taxis are connected through dispatchers and location systems. Typically, modern taxis have embedded with GPS(Global Positioning System), which aims for obtaining the route information. By analyzing the frequency of taxi trip events, we can find the frequent route for a given query time. However, a scalability problem would occur when we convert the raw location data of taxi trip events into the analyzed frequency information due to the volume of location data. For this problem, we propose a NoSQL based top-K query system for taxi trip events. First, we analyze raw taxi trip events and extract frequencies of all routes. Then, we store the frequency information into hash-based index structure of MongoDB which is a document-oriented NoSQL database. Efficient top-K query processing for frequent route is done with the top of the MongoDB. We validate the efficiency of our algorithms by using real taxi trip events of New York City.
Revocation Protocol for Group Signatures in VANETs: A Secure Construction
( Nur Fadhilah Mohd Shari ),( Amizah Malip ),( Wan Ainun Mior Othman ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.1
Vehicular ad hoc networks (VANETs) enable wireless communication between vehicles and roadside infrastructure to provide a safer and more efficient driving environment. However, due to VANETs wireless nature, vehicles are exposed to several security attacks when they join the network. In order to protect VANETs against misbehaviours, one of the vital security requirements is to revoke the misbehaved vehicles from the network. Some existing revocation protocols have been proposed to enhance security in VANETs. However, most of the protocols do not efficiently address revocation issues associated with group signature-based schemes. In this paper, we address the problem by constructing a revocation protocol particularly for group signatures in VANETs. We show that this protocol can be securely and efficiently solve the issue of revocation in group signature schemes. The theoretical analysis and simulation results demonstrate our work is secure against adversaries and achieves performance efficiency and scalability.
Development of a Photoplethysmogram Based Heart Abnormality Detection Technique
Lina Fadhilah Umadi,Siti Nurfarah Ain Mohd Azam,Khairul Azami Sidek 보안공학연구지원센터 2016 International Journal of Bio-Science and Bio-Techn Vol.8 No.4
In this study, the development of Cardioid based graph photoplethysmogram heart abnormality detection technique is presented. PPG signals in this work were collected from an online public repository called MIMIC II Waveform Database, Version 3 Part 1 with sampling rate of 250 Hz. Each recording has one minute of PPG signals. Distinctive features were extracted, and then the Cardioid based graph was plotted as the result of the differentiation of the signals. In addition, the different shapes of closed-loop created were then observed and assessed. From the Cardioid loop, the area and standard deviation were computed to distinguish between normal and abnormal heartbeats. Based on the results, these values for abnormal heartbeat were higher than the value of normal heartbeat thus signifying the differences between two categories of heart conditions. Therefore, the results of this study suggest the capability of the proposed mechanisms to determine heart abnormality and act as an alternative to the current detection system.
Evaluation of the Capacity of Rural Communities in Indonesia to Improve the Economic Welfare
RIANI Westi,FADHILAH Alya Muthia,HARYADI Sigit 한국유통과학회 2022 The Journal of Industrial Distribution & Business( Vol.13 No.9
Purpose: This study evaluates the ability to improve the economic welfare of rural communities in Indonesia by using the inequality measures of the distribution of information between leaders and their people as a variable that weakens the capacity of increasing the welfare. Research Design, Data, and Methodology: The research designed by developing an instrument using data validity and reliability testing. Before, primary data collected through interviews, questionnaires, observation, and documentation on the selected respondents. Then, the research method used is mixed methods research, in which quantitative and qualitative methods combined. Result: The finding from this study is that there is an inequality measure in the form of a high gap between the score of information distribution obtained by the village government compared to the score of the community, which has led to the welfare of the village which is still at a moderate level and not ready to become a prosperous society. Conclusion: The weakness of the village community is related to two things, namely the behavior and knowledge of the community about the issues, so the implication is that there must be a strong effort from the central government to ensure that technology is more evenly distributed to all villagers.
Kamaruddin, Mohamad Anuar,Ismail, Norli,Fauzi, Noor Fadhilah,Alrozi, Rasyidah,Hanif, Mohamad Haziq,Norashiddin, Faris Aiman Techno-Press 2021 Advances in environmental research Vol.10 No.1
Anaerobic digestion (AD) refers to the biological process which can convert organic substrates to biogas in the absence of oxygen. The aim of this study was to determine the capability of feedstock to produce biogas and to quantify the biogas yield from different feedstocks. A co-digestion approach was carried out in a continuous stirred tank reactor operated under mesophilic conditions and at a constant organic loading rate of 0.0756 g COD/ L.day, with a hydraulic retention time of 25 days. For comparison, mono-digestion was also included in the experimental work. 2 L working volumes were used throughout the experimental work. The seed culture was obtained from composting as substrate digestion. When the feedstock was added to seeding, the biogas started to emit after three days of retention time. The highest volume of biogas was observed when the seeding volume used for 1000mL. However, the lowest volume of biogas yield was obtained from both co-digestion reactors, with a value of 340 mL. For methane yield, the highest methane production rate was 0.16 L CH4/mg. The COD with yield was at 8.6% and the lowest was at 0.5%. The highest quantity of methane was obtained from a reactor of Euphorbiaceae peel with added seeding, while the lowest methane yield came from a reactor of Euphorbiaceae stems with added seeding. In this study, sodium bicarbonate (NaHCO3) was used as a buffering solution to correct the pH in the reactor if the reactor condition was found to be in a souring or acidic condition.