• Journal of Information Processing Systems
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• 제13권6호
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• pp.1575-1584
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• 2017

As interest in big data has increased recently, NoSQL, a solution for storing and processing big data, is getting attention. NoSQL supports high speed, high availability, and high scalability, but is limited in areas where data integrity is important because it does not support multiple row transactions. To overcome these drawbacks, many studies are underway to support multiple row transactions in NoSQL. However, existing studies have a disadvantage that the number of transactions that can be processed per unit of time is low and performance is degraded. Therefore, in this paper, we design and implement a multi-row transaction system for data integrity in big data environment based on HBase, a column-based NoSQL which is widely used recently. The multi-row transaction system efficiently performs multi-row transactions by adding columns to manage transaction information for every user table. In addition, it controls the execution, collision, and recovery of multiple row transactions through the transaction manager, and it communicates with HBase through the communication manager so that it can exchange information necessary for multiple row transactions. Finally, we performed a comparative performance evaluation with HAcid and Haeinsa, and verified the superiority of the multirow transaction system developed in this paper.

• 동력기계공학회지
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• 제2권1호
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• pp.39-44
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• 1998

Computational grids used in the numerical simulation of multi staged turbomachinery flow fields are generated. A multiblock structure simplifies the creation of structured H-grids about complex turbomachinery geometries and facilitate the creation of a grid for multi-row topologies. The numerical algorithm adopts the combination of the algebraic and elliptic method to create the internal grids efficiently and quickly. The input module is made of the results of the preliminary design, i.e., flow-path, aerodynamic conditions along the spanwise direction, and the blade profile data. The final grids generated from each module of the system are used as the preprocessor for the performance prediction of the single row cascades and the flow simulation inside the multi staegd blade passage. Application to low pressure compressor of industrial gas turbine engines was demonstrated to be very reliable and practical in support of design activities.

• 대한전자공학회논문지
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• 제21권4호
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• pp.84-89
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• 1984

In the design of digital system, designers use multi-layer LSI to connect all signal sets between circuit modules. This paper suggests how to minimize upper street congestions and lower congestions in the single-row routing, a routing method of multi-layer LSI. This paper suggests the heuristic algorithm which minimize upper street congestions and lower street congestions by suggesting interval graph and relational operator and finding out of the order of signal sets The algorithm was implemented on a VAX-11/780 computer and illustrated by means of examples.

• 한국추진공학회지
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• 제16권3호
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• pp.69-76
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• 2012

본 논문에는 유도탄 사출시스템의 사출성능 향상을 위해 침식연소 현상이 발생하지 않는 상태에서 가스발생기의 압력 기울기를 증가시키는 방법에 대해 기술하였다. 안정연소를 얻기 위해 그레인에 반경방향홀을 뚫는 방법과 그레인의 길이대 직경비를 줄이는 방법을 고안하여 이를 적용, 연소시험을 실시하였다. 시험결과 반경방향홀 그레인을 적용했을 경우 침식연소 방지효과는 좋았으나 사출성능을 저하시키는 쪽으로 성능이 변화하였다. 반면에, 다열형 그레인을 적용시 침식연소 방지효과와 함께 사출성능을 향상시키는데 유용한 것으로 나타났다.

• 소음진동
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• 제11권2호
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• pp.336-345
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• 2001

This research presents a nonlinear model to analyze the ball bearing nitration due to the waviness in a rigid rotor supported by multi-row ball bearings. The waviness of a ball and each races is modeled by the superposition of sinusoidal function, and the position vectors of inner and outer groove radius center are defined with respect to the mass center of the rotor in order to consider five degrees of freedom of a general rotor-bearing system. The waviness of a ball bearing is introduced to these position vectors to use the Hertzian contact theory in order to calculate the elastic deflection and nonlinear contact force resulting from the waviness while the rotor has translational and angular motion. They can be determined by solving the nonlinear equations of motion with five degrees of freedom by using the Runge-Kutta-Fehlberg algorithm. Numerical results of this research are validated with those of prior researchers. The proposed model can calculate the translational displacement as well as the angular displacement of the rotor supported by the multi-row ball bearings with waviness. It also characterizes the nitration frequencies resulting from the various kinds of waviness in rolling elements, the harmonic frequencies resulting from the nonlinear load-deflection characteristics of ball bearing. and the sideband frequencies resulting from the waviness interaction.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2011년도 제37회 추계학술대회논문집
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• pp.432-439
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• 2011

본 논문에는 유도탄 사출시스템의 사출성능 향상을 위해 침식연소 현상이 발생하지 않는 상태에서 가스발생기의 압력 기울기를 증가시키는 방법에 대해 기술하였다. 안정연소를 얻기 위해 그레인에 반경방향홀을 뚫는 방법과 그레인의 길이대 직경비를 줄이는 방법을 고안하여 이를 적용, 연소시험을 실시하였다. 시험결과 반경방향홀 그레인을 적용했을 경우 침식연소 방지효과는 좋았으나 사출성능을 저하시키는 쪽으로 성능이 변화하였다. 반면에, 다열형 그레인을 적용시 침식연소 방지효과와 함께 사출성능을 향상시키는데 유용한 것으로 나타났다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권11호
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• pp.5474-5490
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• 2017

Although two-dimensional principal component analysis (2DPCA) has been shown to be successful in face recognition system, it is still very sensitive to illumination variations. To reduce the effect of these variations, texture-based techniques are used due to their robustness to these variations. In this paper, we explore several texture-based techniques and determine the most appropriate one to be used with 2DPCA-based techniques for face recognition. We also propose a new distance metric computation in 2DPCA called Row Assembled Matrix Distance (RowAMD). Experiments on Yale Face Database, Extended Yale Face Database B, AR Database and LFW Database reveal that the proposed RowAMD distance computation method outperforms other conventional distance metrics when Local Line Binary Pattern (LLBP) and Multi-scale Block Local Binary Pattern (MB-LBP) are used for face authentication and face identification, respectively. In addition to this, the results also demonstrate the robustness of the proposed RowAMD with several texture-based techniques.

• Wind and Structures
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• 제6권5호
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• pp.387-402
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• 2003

In the past decades, much effort has been made towards the study of single-mode-based vibration controls with dynamic energy absorbers such as single or multiple Tuned Mass Dampers(TMDs). With the increase of bridge span length and the tendency of the bridge cross-section being more slender and streamlined, multi-mode coupled vibrations as well as their controls have become very important for large bridges susceptible to strong winds. As a simple but effective device, the TMD system especially the semi-active one has become a promising option for such coupled vibration controls. However, despite various studies of optimal controls of single-mode-based vibrations with TMDs, research on the corresponding controls of the multi-mode coupled vibrations is very rare so far. For the development of a semi-active control strategy to suppress the multi-mode coupled vibrations, a comprehensive parametric analysis on the optimal variables of this control is substantial. In the present study, a multi-mode control strategy named "three-row" TMD system is discussed and the general numerical equations are developed at first. Then a parametric study on the optimal control variables for the "three-row" TMD system is conducted for a prototype Humen Suspension Bridge, through which some useful information and a better understanding of the optimal control variables to suppress the coupled vibrations are obtained. This information lays a foundation for the design of semi-active control.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 추계학술대회 논문집
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• pp.212-215
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• 2005

The needs of larger screen in mobile device would be increased as the time of ubiquitous and convergence is coming. And, the type of mobile device has been evolved from bar, slide to row. Recently, the study on the multi-display screen which has seamless gap between two display panel has been published, and moreover the System On Chip(SOC) design strategy of core chip has been the most promising Field-Programmable Gate Array(FPGA) technology in the display system. Therefore, in this paper, we proposed the design technique of SOC and evaluated the effectiveness with Very high speed Hardware Description Language(VHDL) Intellectual Property (IP) for the operation of multi display device driver. Also, This IP design would be to allow any kind of user interface in control system.

• 한국컴퓨터정보학회논문지
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• 제16권5호
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• pp.135-145
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• 2011

오늘날 센서 기술의 발전 및 보급으로 인해 USN 기반의 실시간 모니터링 응용에서의 센서 데이터 처리 시스템에 대한 연구가 활발히 진행 되고 있다. 센서 데이터는 시간에 따라 빠르게 변화하고 연속적인 저수준 상태의 방대한 양의 데이터를 생성하는 특성을 갖는다. 하지만 엔드유저는 상대적으로 고수준 상태의 데이터에 관심이 있기 때문에 빠르게 변화하고 연속적인 대량의 저수준 센서 데이터를 효과적으로 처리하는 시스템이 필수적이다. 본 논문에서는 USN 기반의 화재감시 응용에서 OLAP(On-Line Analytical Processing) 기술을 이용한 다차원 분석 질의 처리 기능과 학습기반 분류기를 통한 이상치 탐지 기능을 제공하는 센서 데이터 처리 시스템을 제안한다. 실험 시나리오를 통해 우리의 센서 데이터 처리 시스템에 대한 타당성을 검증하며 실험에 필요한 다양한 센서 데이터는 자체 개발한 센서 데이터 생성기를 이용한다.