• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 춘계학술대회
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• pp.323-325
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• 2016

Cloud Computing시대가 도래하였다, 중요 자료는 Clouding하고, 단말기에 한정 받지 않고, 정보를 처리할 수 있다. 최근 Cloud와 Mobile의 접속으로 업무환경이 개선되고, 의사결정이 즉시적으로 이루어지고 있다. 하지만, 정부의 중요한 의사결정과 같은 경우에는 보안성이 필요하다. 본 논문에서는 IoT, Cloud, Bigdata, Mobile을 적용한 Smartwork System에서 네트워크 접근 및 통제를 연구한다. DB정보에 접속할 때의 인증, 권한, 보안 Level 별로 보안등급 서비스를 연구한다. 본 논문의 연구는 Smartwork System을 위한 정보보호로서 공공기관, 중요정보기관의 정보처리 및 의사결정시스템 설계 및 구축의 기초자료로서 이용될 것이다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권1호
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• pp.413-435
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• 2018

Although the accuracy of handwritten character recognition based on deep networks has been shown to be superior to that of the traditional method, the use of an overly deep network significantly increases time consumption during parameter training. For this reason, this paper took the training time and recognition accuracy into consideration and proposed a novel handwritten character recognition algorithm with newly designed network structure, which is based on an extended nonlinear kernel residual network. This network is a non-extremely deep network, and its main design is as follows:(1) Design of an unsupervised apriori algorithm for intra-class clustering, making the subsequent network training more pertinent; (2) presentation of an intermediate convolution model with a pre-processed width level of 2;(3) presentation of a composite residual structure that designs a multi-level quick link; and (4) addition of a Dropout layer after the parameter optimization. The algorithm shows superior results on MNIST and SVHN dataset, which are two character benchmark recognition datasets, and achieves better recognition accuracy and higher recognition efficiency than other deep structures with the same number of layers.

• 대한건축학회논문집:구조계
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• 제35권5호
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• pp.169-179
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• 2019

During the initial design stage of apartment complex, the photovoltaic(PV) system has been considered as an alternative of renewable energy system and planned to install at the rooftop floor level in general. The electric power generation characteristics can be influenced by the block layout, building orientation and roof top structure because of azimuth angle, tilt angle, and partial shading. This study aims to investigate power generation characteristics of photovoltaic system in apartment buildings by considering the partial shading conditions due to the block layout, building orientation and roof-top structures. For the photovoltaic module arrangement planning in rooftop floor level, shading areas were firstly analyzed due to the adjacent building structure. And the annual and seasonal power generation of PV system were analyzed through the PVsyst simulation results. The results show that shading period at the roof top surface can be increased due to the parapet and water tank. Initial design power capacity can be decreased by considering the daily insolation period and distance between PV modules through the shading simulation. As the number of PV modules decreases, the annual power generation can be decreased. However annual power generation per unit area of PV modules can be increased and performance ratio can be increased above 80%. Also the power generation of PV system can be critically affected by building orientation and the performance ratio can be drastically decreased in east-oriented buildings due to the shading problems caused by adjacent structures at roof top level such as parapet and water tank.

• 한국게임학회 논문지
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• 제12권5호
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• pp.35-42
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• 2012

플레이어의 게임공간에 대한 상호작용이 타 장르에 비해 직접적인 FPS게임은 특정 테마를 바탕으로 공간에서의 유리한 지점 확보 및 적의 제거가 주된 플레이이다. 본 논문은 근미래전테마 위주의 Hullett과 Whitehead 연구의 10가지 패턴을 기준으로 과거전, 현대전, 근미래전 3가지 테마에 대한 9종의 FPS게임 디자인패턴을 분석하였다. 그 결과, 10가지의 패턴 외에 주류 패턴으로써 '엄폐물 요소'의 중요한 역할을 발견하였고 '엄폐물 요소'의 패턴 속성을 분석하여 레벨디자인을 위한 효율적인 엄폐물 패턴의 활용방법을 제시하였다. 이러한 결과는 테마에 따른 FPS게임의 레벨디자인을 위한 실증적인 가이드라인으로 활용 될 수 있다.

• 산업공학
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• 제6권1호
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• pp.47-54
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• 1993

Sequential Numbering System(SNS) is one of the production and inventory management system, which is more effective and practical to minor enterprises than Material Requirement Planning (MRP) system or Just-in-Time(JIT) system. The purpose of the paper is the structured analysis of SNS as the first phase of software development. Data Flow Diagram(DFD), Data Dictionary(DD), and Mini-Specs are used to analyze the system through the second level. The result can be exploited to SNS software design and programming.

• 한국정보통신학회논문지
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• 제10권3호
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• pp.564-570
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• 2006

본 고에서는 임베디드 시스템을 위한 새로운 이벤트 중심의 실시간 시스템의 디자인의 최적화에 대한 연구를 논하고자 한다. 이를 위해서는 대단위의 분산처리시스템을 만족하기 위한 종료시한 초과 처리기의 구현이 필수적이며, 이때 실시간 시스템에서의 타이밍을 조절하고 계측할 수 있는 종료시 한이 사용되어야 한다. 이러한 타이밍의 요소들은 보통 모델과 실제 시스템사이의 인터페이스에서 동작하는데, 여기서 실시간 시스템의 디자인을 위한 다양한 그래픽 언어들이 종료시한을 효과적으로 처리하도록 제고한다. 이 연구를 통하여 사용자수준에서의 임베디드 시스템을 위한 종료시한 초과 처리와 함께, RonRT라는 툴을 이용한 최적화된 종료시한 초과 처리기를 증명해 보이고자한다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2000년도 춘계학술대회논문집
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• pp.1416-1422
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• 2000

The cross-flow fans have been widely used to constitute the air moving systems in many air-ventilating and air-conditioning devices. The cross-flow fan system has many design parameters which have crucial influence on the performance and the noise characteristics of the devices. As a result, there are many difficulties in the design stage of the devices and the general design guide has not been sufficiently established yet. This study presents the experimental results of the parametric investigation of some chosen design parameters, which are the shape of the stabilizer, the profile of the scroll casing, and the diffusion angle of the flow exit. The results are expressed as the fan performance and the specific sound pressure level characteristic. These parts have been found to have crucial effects on the system performance/noise characteristics and should be considered with care in the design stage.

• Journal of Computing Science and Engineering
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• 제6권2호
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• pp.79-88
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• 2012

Power continues to be a driving force in central processing units (CPU) design. Most of the advanced breakthroughs in power have been in a realm that is applicable to workstation CPUs. Advanced power management systems will manage temperature, dynamic voltage scaling and dynamic frequency scaling in a CPU. The use of power management systems for microcontrollers and embedded CPUs has been modest, and mostly focuses on very large scale integration (VLSI) level optimizations compared to system level optimizations. In this paper, a dynamic frequency controlling (DFC) technique is introduced, to lay the foundation of a system level power management system for commercial microcontrollers. The DFC technique allows a commercial microcontroller to have minor modifications on both the hardware and software side, to allow the clock frequency to change to save power; results in this study show a 10% savings. By adding an additional layer of software abstraction at the interrupt level, the microcontroller can operate without having knowledge of the current clock frequency, and this can be accomplished without having to use an embedded operating system.

• 전자공학회논문지
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• 제50권5호
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• pp.137-143
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• 2013

최근들어 기계중심의 기술에서 점차 인간 중심의 기술로 변화되어가려는 시도가 많이 이루어지고 있다. 지능 시스템 연구에 있어서도 과거의 단순 학습과 추론 방식에서 지금은 보다 인간과 흡사한 처리, 즉 인간다움을 묘사하는 기능을 구현하려는 방향으로 나아가고 있다. 특히 뇌공학적인 연구가 활발해 짐에 따라 두뇌기능을 공학적으로 응용하려는 연구가 많아지고 있다. 본 논문에서는 이러한 '관점' 이라는 가치관적 상위 요소를 반영할 수 있는 Super Value라고 하는 개념을 정의하고 이에 따라 유연한 추론을 할 수 있는 KEB(Knowledge-Emotion Binding)시스템을 제안하였다. Main Level과 Super Level의 계층적 구조로 추론 과정의 유연성을 부여하였으며 추론 메커니즘에 의하여 KEB 스레드가 추출이 되도록 설계하였다.

• 전력전자학회논문지
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• 제27권6호
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• pp.535-540
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• 2022

DC-link capacitors are reliability-critical components in a photovoltaic (PV) inverter. Typically, the lifetime of a DC-link capacitor is evaluated by considering the voltage and hot-spot temperature of the capacitor under the specific operating condition of the PV inverter. However, the output of the PV inverter is determined by solar irradiation and ambient temperature, which vary with the seasons; accordingly, the hot-spot temperature of the capacitor also changes. Therefore, the mission profile of the PV system should be considered to effectively evaluate the reliability of the DC-link capacitor. In this study, the reliability of the DC-link capacitor of a three-level NPC inverter is comparatively analyzed with and without considering the mission profiles of the PV system, where two mission profiles recorded in Arizona and Iza are considered. The accumulated damage of the DC-link capacitor is calculated based on the lifetime model by analyzing its thermal loading. Afterward, a reliability evaluation of the DC-link capacitor is performed at the component level and then at the system level by considering all capacitors by means of Monte Carlo analysis. Results reveal the importance of performing a mission-profile-based reliability evaluation during the design of high-reliability PV inverters to achieve the target reliability performance.