• Title/Summary/Keyword: Programming characteristics

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Performance Comparison of Python and Scala APIs in Spark Distributed Cluster Computing System (Spark 기반에서 Python과 Scala API의 성능 비교 분석)

  • Ji, Keung-yeup;Kwon, Youngmi
    • Journal of Korea Multimedia Society
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    • v.23 no.2
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    • pp.241-246
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    • 2020
  • Hadoop is a framework to process large data sets in a distributed way across clusters of nodes. It has been a popular platform to process big data, but in recent years, other platforms became competitive ones depending on the characteristics of the application. Spark is one of distributed platforms to enable real-time data processing and improve overall processing performance over Hadoop by introducing in-memory processing instead of disk I/O. Whereas Hadoop is designed to work on Java and data analysis is processed using Java API, Spark provides a variety of APIs with Scala, Python, Java and R. In this paper, the goal is to find out whether the APIs of different programming languages af ect the performances in Spark. We chose two popular APIs: Python and Scala. Python is easy to learn and is used in AI domain in a wide range. Scala is a programming language with advantages of parallelism. Our experiment shows much faster processing with Scala API than Python API. For the performance issues on AI-based analysis, further study is needed.

The Fabrication and Characteristics of p-channel SONOS Charge-Trap Flash Memory (p채널 SONOS 전하트랩 플래시메모리의 제작 및 특성)

  • Kim, Byung-Cheul;Kim, Joo-Yeon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2008.10a
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    • pp.604-607
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    • 2008
  • In this study, p-channel silicon-oxide-nitride-oxide-silicon (SONOS) transistors are fabricated and characterized as an unit cell for NAND flash memory. The SONOS transistors are fabricated by $0.13{\mu}m$ low power standard logic process technology. The thicknesses of gate insulators are $20{\AA}$ for the tunnel oxide, $14{\AA}$ for the nitride layer, and $49{\AA}$ for the blocking oxide. The fabricated SONGS transistors show low programming voltage, fast erase speed, and relatively good retention and endurance.

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Multibody Elastic Contact Analysis by Modified Linear Programming (수정된 선형계획법을 이용한 다물체 탄성 접촉 문제 해석)

  • 이대희;전범준;최동훈;임장근;윤갑영
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.13 no.1
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    • pp.1-8
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    • 1989
  • A general and efficient algorithm is proposed for the analyses of multibody elastic contact problems. It is presumed that there exists negligible friction between the bodies. It utilizes a simplex type algorithm with a modified entry rule and incoporates finite element method to obtain flexibility matrices for arbitrarily shaped bodies. The multibody contact problem of a vehicle support on an elastic foundation is considered first to show the effictiveness of the suggested algorithm. Its solution is compared favorably with the existing solution. A contact problem among inner race, rollers and outer race is analyzed and the distribution of load, rigid body movements and contact pressure distributions are obtained. The trend of contact characteristics is compared with that of the idealized Hertzian solutions for two separate two-body contact problems. The numerical results obtained by directly treating a multibody contact are believed to be more exact than the Hertzian solution for the idealized two separate two-body contact problems.

Optimization of LCD Panel Cutting Problem Using 0-1 Mixed Integer Programming (0-1 혼합정수계획법을 이용한 LCD 패널 절단 문제 최적화)

  • Kim, Kidong;Park, Hyeon Ji;Shim, Yun-Seop;Jeon, Tae Bo
    • Journal of Sensor Science and Technology
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    • v.26 no.4
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    • pp.274-279
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    • 2017
  • LCD(Liquid Crystal Display) panel cutting problem is a sort of two dimensional cutting stock problem. A cutting stock problem is problem that it minimizes the loss of the stock when a stock is cut into various parts. In the most research of the two dimensional cutting stock problem, it is supposed that the relative angle of a stock and parts is not important. Usually the angle is regarded as horizontal or perpendicular. In the manufacturing of polarizing film of LCD, the relative angle should be maintained at some specific angle because of the physical and/or chemical characteristics of raw material. We propose a mathematical model for solving this problem, a two-dimensional non-Guillotine cutting stock problem that is restricted by an arranged angle. Some example problems are solved by the C++ program using ILOG CPLEX classes. We could get the verification and validation of the suggested model based on the solutions.

Computational Thinking as an Enneagram Centered-type (에니어그램 중심유형으로 보는 Computational Thinking)

  • Kim, Se-min;Hong, Ki-cheon;You, Kang-soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2017.10a
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    • pp.644-646
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    • 2017
  • In this study, the university conducted an inspection of the classes of students in the school-grain classes of liberal arts classes and conducted a thorough classification. Each of the students' characteristics is divided into those who have experienced programming in elementary and secondary schools. As a result, classes were classified and followed by Scratch programming classes. The difference between pre-scan and post-test is the identification of the centre of gravity and the different methods of teaching the teaching methods accordingly. Through this study, we learned how to understand and appreciate the difficulties we face while studying computing.

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A Study on the Effect of Format String on Secure Programming in C Language (C언어에서 포맷 스트링이 프로그램 보안에 미치는 영향)

  • Lee, Hyung-Bong;Cha, Hong-Jun;Choi, Hyung-Jin
    • The KIPS Transactions:PartC
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    • v.8C no.6
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    • pp.693-702
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    • 2001
  • One of the major characteristics of C language is that it allows us to use pointer type variables to access any area of virtual address space. So, we can read/write/execute from/to virtual memory area not controlled delicately by operating system. We can access such memory area by using format string and it can be a vulnerability of C language from the point of secure programming. In this paper, we analyze in detail the process of security attack based on format string and then exploit a new virus style attack which is stepwise and durable with some actual scenarios to warn the severity of it, and grope for some preliminary responding actions.

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A Study on Interior Space Programming and spatial Cognition of the High-Speed Train station (고속철도 역사 실내공간 구성과 표현에 관한 연구)

  • 오인욱
    • Korean Institute of Interior Design Journal
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    • no.18
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    • pp.103-109
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    • 1999
  • The purpose of this research is to suggest the ultimate solution to the interior elements and ways to express specific function within interior design of the new high-speed train station in Korea through careful studies based on the characteristics of each areas in the stations. During the research, it became very clear that the most important points in designing of the high speed train station's interior space can be found from close examination on whether each space allocation was thoughtfully organized to provide enough space to accommodate various activities of the users. Another point is to realize, within the space program, that there should be a clear understanding of the future expansion plan and reserving sufficient areas for the future growth. Also the problem of requiring larger floor areas to accommodate various functions divided by separate units must be recognized simultaneously during the programming. The new high-sped train must be able to function as a multi service facility of the future. In summary this research is to present datas and suggestion to various areas in the station and redefine its new meaning of train station space program with much borader concept which can be adopted to the process of better space programing.

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Estimating Producer Risk Preferences and Production Responses using a Regional Optimization Model (지역단위 최적화모형을 이용한 농업생산자 위험선호도와 생산반응 분석)

  • Kwon, Oh-Sang;Lee, Seoungho
    • Journal of Korean Society of Rural Planning
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    • v.26 no.3
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    • pp.25-38
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    • 2020
  • The purpose of this study is constructing a regional-level crop acreage choice model incorporating the impacts of producer risk aversion, and applying the constructed model to the Korean policy that promotes rice paddy conversion into non-rice crop fields. The study adopts the approach of Paris (2018) which estimates the absolute risk aversion coefficient inside of a positive mathematical programming model. A panel data set of 143 cities/counties is used for the empirical study where agricultural land in each region is allocated to 8 crops. Our estimated absolute risk aversion coefficients are smaller than those of Paris (2018), but are a little bit larger than those of the existing Korea studies based on survey or econometric methods. We found that there are close relationships among the estimated risk aversion, regional characteristics, and farming patterns. We also found that incorporating the estimated risk attitudes results in substantial differences in the impacts of the rice paddy conversion policy.

Analysis of Inheritance Anomaly due to Integrated of Inheritance and Concurrency (상속성과 병행성 통합에서 오는 상속 변칙 분석)

  • 오승재
    • Journal of the Korea Society of Computer and Information
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    • v.6 no.4
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    • pp.38-44
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    • 2001
  • The integration of concurrency and object-oriented programming paradigm has been a goal of researchers for over a decade. The concurrent object-oriented programming languages used for various concurrent applications development. However, concurrency and inheritance have conflicting characteristics, thereby inhibiting their simultaneous use without heavy breakage of encapsulation. This conflicting phenomenon is known as inheritance anomalies, have been limited in applicability and have not addressed all the issues that synchronization raises. In this paper, the behavior description equation is introduced for the solution for the conflicting phenomenon, between inheritance and object-based concurrency. As a result, it can solve the several inheritance anomalies and is not necessary to redefine method. Therefor, it offers flexible concurrency model with an emphasis on the reuse of both synchronization and function code.

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Development of Software Education Products Based on Physical Computing (피지컬 컴퓨팅 기반 소프트웨어 교육용 제품 개발)

  • Kim, Eung-Kon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.14 no.3
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    • pp.595-600
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    • 2019
  • Educational tools for infants and younger students are becoming smarter as ICT-based digital technology convergence extends according to the development of technology. As the digital interaction function of smart education tools gives students greater immersion and fun, a learning might become a play to the students. The technologies used in the implementation of smart education tools come from the disciplines of robotics, computer engineering, programming, and engineering and mathematical foundations and these can be integrated into the field of education itself. This paper designs and implements a product based on optimized physical computing for R&D and education in consideration of the characteristics of educational tool robots used in the field education. It was developed to enable physical education for sensing information processing, software design and programming practice training that is the basis of robot system.