• International journal of advanced smart convergence
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• 제10권1호
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• pp.142-150
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• 2021

Open-channel SSD is a new type of Solid-State Disk (SSD) that improves the garbage collection overhead and write amplification due to physical constraints of NAND flash memory by exposing the internal structure of the SSD to the host. However, the host-level Flash Translation Layer (FTL) provided for open-channel SSDs in the current Linux kernel consumes host memory excessively because it use page-level mapping table to translate logical address to physical address. Therefore, in this paper, we implemente a selective mapping table loading scheme that loads only a currently required part of the mapping table to the mapping table cache from SSD instead of entire mapping table. In addition, to increase the hit ratio of the mapping table cache, filesystem information and mapping table access history are utilized for cache replacement policy. The proposed scheme is implemented in the host-level FTL of the Linux kernel and evaluated using open-channel SSD emulator. According to the evaluation results, we can achieve 80% of I/O performance using the only 32% of memory usage compared to the previous host-level FTL.

• Journal of Multimedia Information System
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• 제9권3호
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• pp.201-208
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• 2022

Customized service is a vital and mandatory element for apps in improving their technical performance and app customer analysis. While apps require users' consent for their data extraction and usage, many of the terms and agreement forms are written intricately, making it harder for users to fully understand the whole concept of users' data collection for customized services. Ever since the Facebook-Cambridge Analytica scandal, personal data privacy has been re-examined, forcing many app companies to reinforce a reliable solution to data privacy issues. However, there has not been a secured solution, which worries many people about the future advanced issues when metaverse platforms are actively used in daily apps. The research aims to collect the reactions and behaviors of everyday app users who utilize apps with customized services to understand the nature of privacy data issues and the users' opinions about the future implementation of metaverse platforms. The method of the research was an online questionnaire that targeted university students. The study revealed many fearful and anxious reactions about personal data and further metaverse issues where most app users were uneducated about how current apps collect and utilize users' private data.

• Current Optics and Photonics
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• 제6권1호
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• pp.79-85
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• 2022

Tracers are one of the critical factors for improving the performance of velocimetry. Silver and gold nanoparticles as tracers with localized surface-plasmon resonance are analyzed for their scattering properties. The scattering cross sections, angular distribution of the scattering, and equivalent scattering cross sections from 53° and 1.5° half-angle cones at 532 nm are calculated, with particle sizes in the nanoscale range. The 53° and 1.5° half-angle cones used as examples correspond respectively to the collection cones for microscope objectives in microscopic measurements and camera lenses in macroscopic measurements. We find that there is a transitional size near 35 nm when comparing the equivalent scattering cross sections between silver and gold nanoparticles in water at 532 nm. The equivalent scattering cross section of silver nanoparticles is greater or smaller than that of gold nanoparticles when the particle radius is greater or smaller than 35 nm respectively. When the radius of the plasmonic nanoparticles is smaller than about 44 nm, their equivalent scattering cross sections are at least ten times that of TiO₂ nanoparticles. Plasmonic nanoparticles are promising for velocimetry applications.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권8호
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• pp.2801-2815
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• 2022

With the advent and realization of Software Defined Network (SDN) architecture, many organizations are now shifting towards this paradigm. SDN brings more control, higher scalability, and serene elasticity. The SDN spontaneously changes the network configuration according to the dynamic network requirements inside the constrained environments. Therefore, a monitoring system that can monitor the physical and virtual entities is needed to operate this type of network technology with high efficiency and proficiency. In this manuscript, we propose a real-time monitoring system for data collection and visualization that includes the Prometheus, node exporter, and Grafana. A node exporter is configured on the physical devices to collect the physical and virtual entities resources utilization logs. A real-time Prometheus database is configured to collect and store the data from all the exporters. Furthermore, the Grafana is affixed with Prometheus to visualize the current network status and device provisioning. A monitoring system is deployed on the physical infrastructure of the KOREN topology. Data collected by the monitoring system is further pre-processed and restructured into a dataset. A monitoring system is further enhanced by including machine learning techniques applied on the formatted datasets to identify the elephant flows. Additionally, a Random Forest is trained on our generated labeled datasets, and the classification models' performance are verified using accuracy metrics.

• 산경연구논집
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• 제15권5호
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• pp.39-46
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• 2024

Purpose: This study seeks to address the following research questions: (1) What are the fundamental principles of sports psychology that can be applied to business leadership? (2) How can these principles enhance business leadership effectiveness? As a result, the study may evaluate the necessity and benefits of incorporating sports psychology principles into business leadership practices. Research design, data and methodology: The data collection process in this study involved a systematic Literature review approach, following the prior literature analysis guidelines by numerous past studies. This methodical approach to selecting articles can be useful in synthesizing existing literature and can be referred to as Literature review and selection. Results: The literature analysis has indicated that there is much support for assumptions underpinning business leadership modules, which can be enhanced by applying sports psychology. This topic discusses the traits of self-positivity and mental toughness, goal perspective and interpersonal relationships within a team, and visualization in a sporting organization that can be implemented in business management to support organizational performance. Conclusions: All in all, it can be concluded that organizations must consider adopting Sports Psychology principles into their Leadership Development Programs. Psychological skills development training that includes mental toughness, goal setting, team cohesion,

• 한국산림과학회지
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• 제110권4호
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• pp.630-647
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• 2021

이 연구에서는 산지관리법에서 규정하고 있는 복구비 산출체계의 문제점과 그 개선방안을 파악하고, 이에 근거한 산지복구 표준모델을 개발하여 최적 복구비 산출체계를 도출하고자 전문가 그룹을 대상으로 델파이조사를 실시하였다. 그 결과, 현행 복구비 산출체계의 문제점으로 '토지이용 유형의 부적정', '산지경사 등급의 부적정', '산지복구 기준공종의 불충분'이 채택되었다. 이러한 문제점의 개선방안으로 토지이용 유형을 ① 산지전용허가·신고지 및 산지일시사용허가지, ② 산지일시사용신고지, ③ 토석채취(매각)·광물채굴허가지, ④ 토사채취허가지로 재편성하는 것, 산지경사 등급을 ① θ<10°, ② 10°≦θ<15°, ③ 15°≦θ<20°, ④ 20°≦θ<25°, ⑤ 25°≦θ<30°, ⑥ θ≧30°으로 세분화하는 것, 기존 17개 기준공종 중 3개 공종이 제외되고 15개 공종이 추가된 22개 기준공종 및 7개 추가공종으로 재편성하는 것이 합의되었다. 이상의 결과에 준하여 개발한 24개 표준모델을 토대로 산출한 복구비는 34,185~607,403천원 범위로 나타났으며, 여기에 추가공종, 할증 또는 할인, 감리비가 적용되면 토석채취(매각)·광물채굴허가지에서 최대 668,143천원에 이르는 것으로 나타났다. 이러한 표준모델에 의한 복구비 분포에 대해서도 전문가들의 의견은 높은 수준에서 합의가 이루어졌다. 이상의 연구결과는 대집행 복구사업의 원활한 수행을 위해 예치되는 복구비의 적정성을 확보하는 데에 기여할 수 있을 것으로 기대한다.

• Asia pacific journal of information systems
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• 제17권3호
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• pp.131-146
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• 2007

Recently, the role of IT service providers has been enlarged from managing a single function or system to reconstructing entire information management processes in new ways to contribute to shareholder value across the enterprise. This movement toward extensive and complex outsourcing agreements has been driven by the assumption that outsourcing information technology functions is a reliable approach to maximizing resource productivity. Hiring external IT service providers to manage part or all of its information-related services helps a firm focus on its core business and provides better services to its clients, thus obtaining sustainable competitive advantage. This practice of focusing on the strategic aspect of outsourcing is referred to as strategic sourcing where the focus is capability sourcing, not procurement. Given the importance of the strategic outsourcing, however, to our knowledge, there is little empirical research on the relationship between the strategic outsourcing orientation and outsourcing performance. Moreover, there is little research on the factor that makes the strategic outsourcing effective. This study is designed to investigate the relationship between strategic IT outsourcing orientation and IT outsourcing performance and the process through which strategic IT outsourcing orientation influences outsourcing performance, Based on the framework of strategic orientation-performance and core competence based management, this study first identifies core competency orientation as a proper strategic orientation pertinent to IT outsourcing and IT outsourcing process management capability as the mediator to affect IT outsourcing performance. The proposed research model is then tested with a sample of 200 firms. The findings of this study may contribute to the literature in two ways. First, it draws on the strategic orientation - performance framework in developing its research model so that it can provide a new perspective to the well studied phenomena. This perspective allows practitioners and researchers to look at outsourcing from an angle that emphasizes the strategic decision making to outsource its IT functions. Second, by separating the concept of strategic orientation and outsourcing process management capability, this study provides practices with insight into how the strategic orientation can work effectively to achieve an expected result. In addition, the current study provides a basis for future studies that examine the factors affecting IT outsourcing performance with more controllable factors such as IT outsourcing process management capability rather than external hard-to-control factors including trust and relationship management. This study investigates the major factors that determine IT outsourcing success. Based on strategic orientation and core competency theories, we develop the proposed research model to investigate the relationship between core competency orientation and IT outsourcing performance and the mediating role of IT outsourcing process management capability on IT outsourcing performance. The model consists of two independent variables (core-competency-orientation and IT outsourcing process management capability), and two dependent variables (outsourced task complexity and IT outsourcing performance). Comprehensive data collection was conducted through an outsourcing association. The survey data were analyzed using a structural analysis method. IT outsourcing process management capability was found to mediate the effect of core competency orientation on both outsourced task complexity and IT outsourcing performance. Further analysis and findings are discussed.

• 대한원격탐사학회지
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• 제11권3호
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• pp.101-116
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• 1995

최근 안전성과 경제성을 고려한 교통자료획득 방법으로 인공위성 영상자료를 사용하는 기술이 논의되어졌다. 본 논문은 인공위성영상을 이용한 고속도로 교통량 측정 자동화에 관한 연 구로서, 현재 사용되고 있는 교통량 측정방법의 단점 및 문제점을 평가, 분석하였으며, 본 보고서 에서 제안된 인공위성영상을 이용한 방안의 적용 및 가능성을 연구, 분석 하였다. 기존 인공위성 영상자료의 해상도가 교통자료획득에 적합하지 않으므로, 사진영상에 제안된 방 안을 도입하여, 실효성에 바탕을 둔 적용 여부를 검증하였다. 차량종류 및 교통량 측정에 필요한 인공위성영상의 해상도를 구하기 위하여 세 단계 (1m, 2m, 3,)의 사진영상해상도가 검토되었으며, 본 연구에서 제안된 일련의 영상처리 결과를 분석하였다. 전색성(panchromatic) 영상에서 도로와 차량의 반사율이 유사함으로, 도로상에서 차량을 탐지하 기 위하여 차량의 반사율을 이용하지않고 차량그림자의 반사율을 이용하였으며, 두가지 처리방법 이 제시되었다. 또한 차량종류를 구분하기위하여 여러가지 형태계수를 개발, 적용하였으며, 처리 과정을 상세히 설명하였다.

• 한국방사선학회논문지
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• 제8권7호
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• pp.423-428
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• 2014

현재까지 TFT 기반의 평판형 어레이를 이용한 디지털 X선 영상장치가 이용되어 왔다. 그러나, 최근 광계수형 센서 기술에 대한 많은 연구가 수행되고 있다. 본 연구에서는 광계수형 X선 영상 센서의 정량적 성능 평가를 위한 기시법 제시를 통해 광도전체 물질의 물성을 평가하였다. 먼저 광계수형 X선 영상 센서의 검출물질인 광도전체의 누설전류 및 X선 민감도 측정을 수행하였으며, 신호 정형 시간 결정을 위한 상승시간 특성을 평가하였다. 또한 광도전체에 입사하는 단위면적당 포톤수를 정의하기 위해 IEC 62220-1-2 권고안을 바탕으로 셋업 연구를 수행하였으며, 이를 바탕으로 전하수집효율를 평가하였다. 그 결과 광도전체 층의 누설전류는 $200pA/mm^2$, X선 민감도는 $7{\mu}C/cm^2R$이며, 상승 시간은 $0.765{\mu}s$으로 평가되었다.

• 한국건설관리학회논문집
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• 제4권2호
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• pp.66-73
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• 2003

최근 수행되는 건설프로젝트가 대형화$\cdot$복잡화되면서 많은 공종에서 다양한 협력업체가 투입되게 되며, 기존의 관리 방식으로는 급격히 늘어나는 자원 및 작업의 정보를 관리하는데 한계점이 드러나고 있다. 이러한 현장공사의 효율적인 관리를 위해서 다양한 공사정보 관리 시스템들이 제시되고 있으나, 시공업체 중심의 시스템 관리와 협력 업체의 참여도 및 이해도 부족과 협력업체의 재무, 기술, 관리 측면에서의 영세성으로 인해서 효율적인 적용이 어려운 것으로 나타나고 있다. 또한 현장공사관리에 기초 자료로 제공되는 작업일보의 정보들을 수집/분석/관리하는데 상당한 시간과 인력이 소모되고, 정보의 사용주체와 사업수행단계가 바뀜에 따라 정보가 손실되며, 정보매체 및 입력방법과 입력주체가 바뀜에 따라 정보가 왜곡되고 누락되는 등 다양한 문제점이 나타나고 있다. 따라서 본 연구에서는 현장에서 작성되는 작업일보에서 인력/작업 정보 수집의 현황을 파악하여 작업일보의 기능 및 문제점을 분석하고, 작업일보의 업무 및 정보흐름을 분석하여 개선방향을 제시하는 것을 목적으로 하고 있다. 더 나아가, 작업일보의 작성프로세스를 개선하고, 협력업체 중심의 정보입력 및 관리를 통한 공사의 생산성을 향상시킬 수 있는 작업일보의 개선방향을 제시하고자 한다.