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The Design of Method for Efficient Processing of Small Files in the Distributed System based on Hadoop Framework (하둡 프레임워크 기반 분산시스템 내의 작은 파일들을 효율적으로 처리하기 위한 방법의 설계)

  • Kim, Seung-Hyun;Kim, Young-Geun;Kim, Won-Jung
    • The Journal of the Korea institute of electronic communication sciences
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    • v.10 no.10
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    • pp.1115-1122
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    • 2015
  • Hadoop framework was designed to be suitable for processing very large files. On the other hand, when processing the Small Files, it waste the resource of a distributed system, and occur performance degradation. It is shown noticeable the more the Small Files. This problem is caused by the Small Files, it can be solved through the merging of associated Small Files. But a way of merging of Small Files has some limited point. in this paper, examines existing limit of merging method, design merging method Small Files for effective process.

A Study on the Phenomenological Elements Appearing in Small-Scale Art Museums - From the Viewpoint of Phenomenology of Perception of M. Merleau-Ponty - (소규모 미술관에 나타나는 현상학적 요소에 관한 연구 - 메를로 퐁티의 지각의 현상학을 중심으로 -)

  • Choi, Jin-Seok;Kim, Moon-Duck
    • Korean Institute of Interior Design Journal
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    • v.23 no.3
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    • pp.212-221
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    • 2014
  • This study aims to analyze and explore phenomenological elements that appear in small-scall art museums with spatial concepts, such as top and bottom, depth, movement, and experienced space on the basis of Merleau-Ponty $Ph\acute{e}nom\acute{e}nologie$ de la perception.' Therefore, small-scale art museums may be regarded as an ideal space that can be analyzed with Merleau-Ponty's phenomenological theory since they should provide viewers with various spatial experiences in a limited space, breaking away from spatial limitations beyond appreciation of artworks. As research subjects, the range of art museums was limited to ones whose designs architectures or interior designers participated in out of all the small-scale art museums constructed after the 1990s, when the concepts and directing methods of spatial experience elements started being applied to art museums. Small-scale art museums chosen as cases were analyzed with Merleau-Ponty's spatial concepts explained earlier, and this study drew conclusions for each one. The significance of this study is that the results of this study can be used as efficient materials to reflect phenomenological elements on planning future small-scale art museums through further studies on various small-scale art museums.

A Basic Study on the Space Planning of the University Small Theater - Focused on the Space Analysis of the Small Theaters in Seoul - (대학 소극장의 공간 계획에 관한 기초적 연구 - 서울시 소재 소극장의 내부 공간 분석을 중심으로 -)

  • Jung, Won-Ju
    • Journal of the Korean Institute of Educational Facilities
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    • v.15 no.1
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    • pp.62-72
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    • 2008
  • The purpose of this research is to make a basic study of a small theater planned to be built on the university campus for the exclusive use of performing arts. For this, the documents and records of small theaters in Seoul was first reviewed. And then, some selected theaters among small theaters opened since 2000 was examined and analyzed by their blueprints, design maps and actual measurement on the spot. Since 1990s, the increase in per capital income, the advancement of culture and arts, and the accompanying increase in demand have prompted universities to open performing arts courses. Going beyond the concept of a multipurpose auditorium a space devoted to professional performances has been increasingly needed by many universities. Small theaters that have been the subjects of study have become extinct or changed for other uses due to the rapid changes in the performing environment. This research examined theaters that have opened since 2000 and analyzed the data on their stages and seats. This study is intended for providing preliminary data for building of a small theater on the university campus.

Advanced Small-Signal Model of Multi-Terminal Modular Multilevel Converters for Power Systems Based on Dynamic Phasors

  • Hu, Pan;Chen, Hongkun;Chen, Lei;Zhu, Xiaohang;Wang, Xuechun
    • Journal of Power Electronics
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    • v.18 no.2
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    • pp.467-481
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    • 2018
  • Modular multilevel converter (MMC)-based high-voltage direct current (HVDC) presents attractive technical advantages and contributes to enhanced system operation and reduced oscillation damping in dynamic MMC-HVDC systems. We propose an advanced small-signal multi-terminal MMC-HVDC based on dynamic phasors and state space for power system stability analysis to enhance computational accuracy and reduce simulation time. In accordance with active and passive network control strategies for multi-terminal MMC-HVDC, the matchable small-signal stability models containing high harmonics and dynamics of internal variables are conducted, and a related theoretical derivation is carried out. The proposed advanced small-signal model is then compared with electromagnetic-transient and traditional small-signal state-space models by adopting a typical multi-terminal MMC-HVDC network with offshore wind generation. Simulation indicates that the advanced small-signal model can successfully follow the electromechanical transient response with small errors and can predict the damped oscillations. The validity and applicability of the proposed model are effectively confirmed.

Moderating Effects of Work-family Conflict between Job·Organizational·Career Characteristics and Turnover Intention among Nurses in Small and Medium-sized Hospitals (중소병원 간호사의 직무·조직·경력 특성과 이직의도와의 관계에서 일-가정 갈등의 조절효과)

  • Choi, Hyun Ju
    • Journal of Korean Academy of Nursing Administration
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    • v.21 no.3
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    • pp.297-307
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    • 2015
  • Purpose: The purpose of this study was to identify moderating effects of work-family conflict in the relationship between job, organizational, career characteristics and turnover intention among nurses working in small and medium-sized hospitals. Methods: A self report questionnaire survey was completed by 286 nurses working in five small or medium-sized hospitals in P city. Data were gathered during October, 2014 and analyzed using the SPSS 21.0 program. Results: Work-family conflict had significant moderating effects between job, organizational, career characteristics and turnover intention of nurses working in small or medium-sized hospitals. Career commitment was the biggest factor in reducing turnover intention. Conclusion: The results of the study indicate that work-family conflict and career commitment are important factors in turnover intention among nurses working in small and medium-sized hospitals. Therefore, to understand job and organizational career characteristics of nurses in small and medium hospitals, consideration must be given to the role of conflict in the nurses' workplace and homes. Support from the organization focusing on career development, and provision of an innovative system for the environment of small hospitals are needed.

CALS Implementation Policy for Information-based Management of Small and Medium Companies (중소기업의 정보화를 위한 CALS 도입 정책 방안)

  • 김철환
    • The Journal of Society for e-Business Studies
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    • v.2 no.1
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    • pp.1-20
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    • 1997
  • This study aims to suggest CALS implementation strategies and policies for information-based management of small and medium companies in Korea. At the turning point from traditional document-based management to recent digital-based one, it is well known that implementation of CALS concept is crucial for advancing business management of small and medium enterprises In order to attack the aim, this paper critically analyzes the empirical difficulties and obstacles of the current information-based management of small and medium companies in Korea. On the basis of the above analysis, this paper suggests the strategic plans and policies of CALS implementation for small and medium enterprises in Korea as follows. First, government should provide the supporting policies and proper system so that the large enterprise can be linked with small and medium companies for sharing necessary information. Second, similar enterprises should be integrated on the basis of information and automation evaluation. Third, implementation strategies and plans should be advanced on the basis of the informationalized phases with respect to the technology level of small and medium enterprises. For more efficient CALS implementation, this paper also proposes the following subsidiary policies. First, it is substantially important to publicize the nation-wide spreading of CALS mind. Second, it is strongly recommended to educate and train CALS specialist on a consistant basis. Third, government should support the enterprises by providing sufficient fund for CALS implementation. Fourth, the ideal CALS implementation models for small and medium enterprises should be developed. Fifth, the consulting and training program for CALS implementation should be established through ECRC (Electronic Commerce Resource Center). My study was based upon the enterprises' responses to the questionaires I made

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Case Study of Spatial Planning for the Efficient Use of Small Dwelling Space (소규모 주거공간의 효율적 활용을 위한 공간계획 사례연구)

  • Park, Si-Yoon;Kim, Jeong-Ah
    • Journal of the Korean housing association
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    • v.25 no.1
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    • pp.15-22
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    • 2014
  • In the domestic housing market, uncompleted lot-solid apartments and unoccupied residences are increasing in the medium-large scale area whose rents and transactions have been unstable, as going through the financial crisis and economical recession. Demands for small-scale housings are steadily increasing by practical consumer group who don't need large places, which are often not needed for the current people who are spending most of their time outside of their houses. Therefore, this study proposes the useful methods for spatial planning for small-scale houses for multiple households, including variable form, levels form, multi-level form, and smart-sizing. For efficient spatial planning for that purpose, here, small-scale housings are not limited to places for families with 1-2 members, but considered as one of broader approaches to graft various households and families. In addition, we examined the existed trends of researches about spatial utility of small-scale places, and did the research about the status of small-scale housing developments, and then proposed the direction for future small-scale housings by analyzing the advanced examples.

Small Firms' Adoption Intention of Inter-Firm Electronic Linkages (소기업의 기업간 전자적 연결 도입 의도에 관한 연구: 기대 가치와 거래 관계 특성의 관점)

  • Lee, Won-Jun;Kang, Youn-Jung;Kim, Kil-Sun
    • Asia pacific journal of information systems
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    • v.15 no.2
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    • pp.171-193
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    • 2005
  • Small firms are considered as the last mile in electronic networks of business enterprises. Since small firms lack in their resources and capabilities for IT deployment, it seems a challenging project to make them electronically linked to their trading partners. This study aims to investigate the factors that influence the intent of small firms to adopt electronic linkage to their trading partners. This study considers the context where small firms already have transaction relationships with partner firms and where their adoption of electronic linkage may influence the nature and performance of the transactional relationships. This study considers the expected value of electronic linkage and the joint actions of the trading firms as the major factors. Its research model also includes traditional factors such as influences from the industry and the trading partner, the support of CEO, and the readiness of the trading partner. Based on the survey data from more than 1000 small firms, the present study performs regression analysis and finds that all but one factor are significant in explaining the variations in the adoption intention of small firms. The exception is the joint action, which is shown to decrease the intention. Based on the results, this study offers business and policy implications that would be useful to business managers and policy makers.

A Study of the effective model and method development through Factory Saemaul Undong activity for selfcontrol small group activity in Korea (공장새마을운동 활성화를 통한 자주관리 소집단분임조활동의 추진모형과 효과적인 실천방법개발에 관한 연구)

  • 신용백
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.13 no.22
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    • pp.99-111
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    • 1990
  • The first national QC Circle Convention sponsored by Industry Advancement Administration in 1975 was the beginning of employees group activity from a national point view. Subsequently some events such as the first nationwide Factory Seamaul activity small Group Convention, which was supervised by the ministry of Trading and Industry and Factory Seamanulundong promotion Center, paved the way for proliferation of the group activity through all kinds of manufacturing. Although since November 1982 these two conventions has been united, many problem have been disclosed that are against the basic principle more or less. Worker's small group activity is, essentially, a trouble shooting oriented voluntary small group within their working place to improve the surroundings creatively. In practice, however, many groups are so typical and so impetuous of the material effect that it is worried to be inclined to outform rather than contents. Effective small group activities are presumed to he successful only with labor management cooperation on the basis of human-oriented management philosophy. The small group activities are also prevalent in service sector. More derivative methods have been developed and more members are willingly participating in training programs. The small group which is basically a horizontal organization unit, promotes communication within the whole organization. In consideration of the social circumstances and traditions, the flexible model of the small group activities suitable to the corporate environment, will contribute to industrial development.

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A Experimental Comparison Analysis for the Characteristics of Impulse Noise Caused by Shooting of Small Arms (소구경 화기의 사격음 특성에 대한 비교분석 연구)

  • Park, Mi-You;Shim, Cheul-Bo;Hong, JunSeok
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.26 no.5
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    • pp.578-583
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    • 2016
  • In order to provide a basis data for design of small arms and their silencer, an experimental study on firing noise of small arms was performed around the muzzle of a gun. For this experimental comparison analysis, the target small arms were included most operating small arms in our country. The sound pressure levels were measured at a certain distance which was predetermined according to US army firing test procedure, TOP 3-2-045. By this experimental study, the sound pressure levels of 5.56 mm caliber small arms are 143 dB ~ 145.4 dB and 7.62 mm caliber small arms are 144 dB ~ 145.2 dB. Between the heavy machine gun K12 and M60, the sound pressure level of K12 is slightly lower than M60.Also silencer for K14 snifer rifle was tested. Using this result, it has been found that the reduction effect of the silencer is 15.4 dB but the improvements of silencer performance in the high frequency range have to be studied later on.