• Title/Summary/Keyword: prime process

Search Result 243, Processing Time 0.028 seconds

A study on the Developmental Indicators of Urban Forest with Reference to User Recreational Satisfaction -Case study of Mt. Gum-Jung- (이용자의 레크리에이션 이용만족에 기초한 도시림의 개발지표 설정에 관한 연구 -부산시 금정산을 사례로-)

  • 박승범;김승환;남정칠;강영조;양위주
    • Journal of the Korean Institute of Landscape Architecture
    • /
    • v.23 no.4
    • /
    • pp.50-60
    • /
    • 1996
  • The purpose of this study is to investigate the prime factors that affect user satisfaction of area and facilities in urban forests, to classify those factors, to find out factorial structure of user satisfaction about them, and then to suggest important indicators in the urban forest planning, design, and development. The survey research was done using the self-administered questionnaire method by the people in the city of the Pusan who participated in recreational activities in the Mt. Keumjung. Factor analysis was used to extract the prime factors related to the recreational satisfaction concerning the area and facilities of the urban forest by the SPSS program, and then prime factors were used to investigate the factorial structure of user recreational satisfaction in the urban forest by the LInear Structure RELation program. According to the factor analysis concerning the 13 variables, 4 prime factors by the statistical values were considered as effective, indicating, 'health and recreational facilities', 'convenience and management facilities','facilities for the physical and psychological training' and 'historical and cultural areas'. The results of the causal structure analysis were identified as having significant effects mutually on endogenous variables, 'overall recreational satisfaction of the areas and facilities in the Mt. Keumjung','health and recreational facilities','convenience and management facilities','facilities for the psychological training', and 'historical and cultural areas'. But exogenous variables which have significant effects on endogenous variables were also indentified. Overall fits of both causal model were very good. The hypothetical causal structural equation models based on the results found partially significant correlation between dndogenous variables and between envogenous and exogenous variables. These significant relationships indiate important factors and variables that should be considered in planning, design, and development of the urban forests. Therefore, development direction of the Mt. Keumjung has to be analyzed as significant factors concerning user recreational satisfaction in a systematic was, recognized as important variables for planning process. The plan for development and management also should reflect the natural conservation policy from the environmental conservation movement like natural conservation advertisement and environmental education.

  • PDF

A Study On Reduce Scheme Of Design Error In Turn-Key Projects (턴키공사 설계오류 저감방안에 관한 연구)

  • Kim Byeong-Soo;Kim Kyong-Ju
    • Proceedings of the Korean Institute Of Construction Engineering and Management
    • /
    • autumn
    • /
    • pp.286-289
    • /
    • 2003
  • In turn-key projects, escalation of cost by design errors is not allowed because a contractor prepares the design. Therefore, cost escalation by design errors results in increasing the cost of the prime contractor. The rate of profit decreases finally. In addition, design errors bring not only schedule delay but also serious quality problem by unknown errors. This study tries to dissolve problems, that of cost increase. process delay and a falling-off in quality by investigating cause of design errors and presenting a scheme for reducing design errors.

  • PDF

Development of Alkali Metal Thermal-to-Electric Converter Unit Cells Using Mo/TiN Electrode

  • Seog, Seung-won;Choi, Hyun-Jong;Kim, Sun-Dong;Lee, Wook-Hyun;Woo, Sang-Kuk;Han, Moon-Hee
    • Journal of the Korean Ceramic Society
    • /
    • v.54 no.3
    • /
    • pp.200-204
    • /
    • 2017
  • Molybdenum (Mo), an electrode material of alkali metal thermal-to-electric converters (AMTEC), facilitates grain growth behavior and forms Mo-Na-O compounds at high operating temperatures, resulting in reduced performance and shortened lifetime of the cell. Mo/TiN composite materials have been developed to provide a solution for such issues. Mo is a metal that possesses excellent electrical properties, and TiN is a ceramic compound with high-temperature durability and catalytic activity. In this study, a dip-coating process with an organic solvent-based slurry was used as an optimal coating method to achieve homogeneity and stability of the electrodes. Cell performance was evaluated under various conditions such as the number of coatings, ranging from 1 to 3 times, and heat treatment temperatures of $800-1100^{\circ}C$. The results confirmed that the cell yielded a maximum power of 9.99 W for the sample coated 3 times and heat-treated at $900^{\circ}C$.

A Study on the Expert System with Three State Inference & Rule Verification (삼상태 추론과 룰 검증이 가능한 전문가 시스템에 관한 연구)

  • Son, Dong-Wook;Park, Young-Moon;Yoon, Ji-Ho
    • Proceedings of the KIEE Conference
    • /
    • 1991.07a
    • /
    • pp.341-344
    • /
    • 1991
  • Rules in expert system have meaning of assigning never-happen-minterms. Overall logical relations of variables can be achived by making all prime implicants of never-happen-minterms. From prime implicants, two tables, which are necessary in the process of inference, are constructed. There are two inferencing modes. One excutes inference only one variable which the user is interested in, and the other excutes inference all variables simultaneously. Outputs of inference have not only 'true' or 'false' but also 'unknown' which is different from conventional expert system. In this paper, an efficient approach is presented, which can check logical inconsistency in knowledge base and contradiction between input facts and rules. The methods in the paper may be available in the field of diagnosis and alarm processing.

  • PDF

Partnership Enterprise Modeling Using FIDO-Integrated Systems Modeling Technique (FIDO 방법론을 이용한 기업 간 연계 프로세스 모델링)

  • Kim, Joong-In;Kim, Cheol-Han;Lee, Kyung-Huy
    • IE interfaces
    • /
    • v.15 no.1
    • /
    • pp.55-63
    • /
    • 2002
  • This paper utilizes the FIDO methodology (Function, Information, Dynamic, Organization modeling) which is an enterprise modeling tool that can describe inter-organizational interaction (specifically between prime and sub contractors in this experiment). FIDO follows the standard IDEFO rules in order to demonstrate how a cascading information flow can evolve from a customer to a prime to a subcontractor in a concurrent manner, in a supply chain environment. Background on these processes is presented, followed with the newly derived process and methodology. This is presented in a supply chain management context, and results from an actual experiment at Motorola utilizing subcontractors that supply custom machine parts is presented and reviewed.

ON FULLY IDEMPOTENT RINGS

  • Jeon, Young-Cheol;Kim, Nam-Kyun;Lee, Yang
    • Bulletin of the Korean Mathematical Society
    • /
    • v.47 no.4
    • /
    • pp.715-726
    • /
    • 2010
  • We continue the study of fully idempotent rings initiated by Courter. It is shown that a (semi)prime ring, but not fully idempotent, can be always constructed from any (semi)prime ring. It is shown that the full idempotence is both Morita invariant and a hereditary radical property, obtaining $hs(Mat_n(R))\;=\;Mat_n(hs(R))$ for any ring R where hs(-) means the sum of all fully idempotent ideals. A non-semiprimitive fully idempotent ring with identity is constructed from the Smoktunowicz's simple nil ring. It is proved that the full idempotence is preserved by the classical quotient rings. More properties of fully idempotent rings are examined and necessary examples are found or constructed in the process.

Effect of Thermomechanical Treatments on Microstructure and Mechanical Properties in Al-Li-Cu-Mg Alloy (Al-Li-Cu-Mg합금의 조직과 기계적 성질에 미치는 가공열처리의 영향)

  • Woo, Kee-Do;Cho, Hyun-Kee
    • Journal of the Korean Society for Heat Treatment
    • /
    • v.3 no.1
    • /
    • pp.8-16
    • /
    • 1990
  • Effects of thermomechanical treatments(TMT) on the microstructures and mechanical properties in Al-2.27%, Li-1.28%, Cu-0.63%, Mg-0.12%, Zr alloy were investigated. The TMT process improved the tensile strength. Growth of ${\delta}^{\prime}$, S' and $T_1$ phases was restrained by TMT processes while the density of ${\delta}^{\prime}$, S' and $T_1$ phases was increased by TMT processes. The TMT treated specimens tend to fail in inter-subboundary mode. The increases of strength by the T-HA processes were compared to those of the T-AHA processes.

  • PDF

Activity-Theoretical Analysis on the Relation of Small Group Activity on Gifted Elementary Student's Concept Formation of Prime and Composite Numbers (소집단 활동체계와 초등영재의 소수와 합성수 개념 형성 사이의 관계 분석)

  • Kang, Young Ran;Kim, Jin Hwan
    • School Mathematics
    • /
    • v.16 no.3
    • /
    • pp.613-631
    • /
    • 2014
  • The aim of this study was to investigate how the small group activity system influences individual to form concepts of prime number and composite number through activity theory on learning process of mathematically gifted 5th-grade students. Student's worksheets, recorded video, and interview were gathered and transcribed for analyzing data. Process of concept formation and using symbol behavior were used to derive the stage of mathematical concept from students, and the activity system and stage of concept formation process were schematized through analysis of whole class activity system and small group activity system based on activity theory. According to the results of this study, two students who were in different activity groups separated into the state of semi-concept and the stage of complex thinking respectively, and therefore, social context and the activity system had effects on process of concept formation among the students.

  • PDF

A Study of Field Application Process of Public Key Algorithm RSA Based on Mathematical Principles and Characteristics through a Diagnostic (수학원리와 특성 진단을 기반으로 한 공개키 RSA 알고리즘의 현장 적용 프로세스)

  • Noh, SiChoon;Song, EunJee;Moon, SongChul
    • Journal of Service Research and Studies
    • /
    • v.5 no.2
    • /
    • pp.71-81
    • /
    • 2015
  • The RSA public key encryption algorithm, a few, key generation, factoring, the Euler function, key setup, a joint expression law, the application process are serial indexes. The foundation of such algorithms are mathematical principles. The first concept from mathematics principle is applied from how to obtain a minority. It is to obtain a product of two very large prime numbers, but readily tracking station the original two prime number, the product are used in a very hard principles. If a very large prime numbers p and q to obtain, then the product is the two $n=p{\times}q$ easy station, a method for tracking the number of p and q from n synthesis and it is substantially impossible. The RSA encryption algorithm, the number of digits in order to implement the inverse calculation is difficult mathematical one-way function and uses the integer factorization problem of a large amount. Factoring the concept of the calculation of the mod is difficult to use in addition to the problem in the reverse direction. But the interests of the encryption algorithm implementation usually are focused on introducing the film the first time you use encryption algorithm but we have to know how to go through some process applied to the field work This study presents a field force applied encryption process scheme based on public key algorithms attribute diagnosis.

Influence of Heat Treatment on Transformation Characteristics and Shape Recovery in Fe-X%/Mn-5Cr-5Co-4Si Alloy Ribbons (Fe-X%Mn-5Cr-5Co-4Si 합금 리본의 변태특성 및 형상기억능에 미치는 열처리 영향)

  • Kang, H.W.;Jee, K.K.;Jang, W.Y.;Kang, J.W.
    • Journal of the Korean Society for Heat Treatment
    • /
    • v.14 no.3
    • /
    • pp.160-166
    • /
    • 2001
  • The change of ribbon geometry, microstructure and shape recovery with Mn contents, wheel speed and various annealing temperature have been studied in Fe-X%Mn-5Cr-5Co-4Si (X%=15, 20, 24) shape memory alloy (SMA) ribbons rapidly solidfied by single roll chill-block melt-spinning process. The thickness and width of melt-spun ribbons are reduced, results in refining and uniformalizing grains with increasing wheel speed. In the ribbons melt-spun at a wheel speed of 15m/sec, both ${\varepsilon}$ and ${\alpha}^{\prime}$martensites are formed in ribbon 1 (15.5wt%Mn), while only ${\varepsilon}$ martensite is revealed in ribbon 2 (20.2wt%Mn) and ribbon 3 (23.5wt%Mn). The volume fraction of ${\varepsilon}$ martensite is decreased with increasing Mn contents, and those of ${\varepsilon}$ as well ${\alpha}^{\prime}$martensites are increased due to thermal stress relief and grain growth with increasing annealing temperature. Ms temperatures of the ribbons 1, 2 and 3 are fallen with increasing Mn contents. $M_s$ temperatures of the ribbons 1, 2 and 3 annealed at $300^{\circ}C$ for 3 min are risen abruptly, but are nearly constant even at higher annealing temperature, i.e., 400, 500 and $600^{\circ}C$ for 3 min. Shape recovery of the ribbons 1, 2 and 3 increased 30%, 52% and 69% with Mn contents, respectively. Shape recovery of ribbon 1 (15.5wt%Mn) formed ${\varepsilon}$ and ${\alpha}^{\prime}$martensites decreased because of the presence of ${\alpha}^{\prime}$martensite but those of ribbon 2 (20.2wt%Mn) and ribbon 3 (23.5wt%Mn) formed ${\varepsilon}$ martensite increased with increasing annealing temperature.

  • PDF