• 정보보호학회논문지
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• 제25권1호
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• pp.155-164
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• 2015

저장된 데이터에 대한 높은 가용성과 기밀성을 보장하는 정보분산 알고리즘은 클라우드 스토리지 등 장애 발생 비율이 높고 신뢰할 수 없는 분산 스토리지 시스템에서 유용한 방법이다. 스토리지에 저장되는 데이터의 양이 증가하면서 IT 자원을 효율적으로 활용하기 위한 데이터 중복제거기법이 많은 주목을 받고 있으며 이에 따라 데이터 중복제거가 가능한 정보분산기법에 대한 연구도 필요한 시점이다. 본 논문은 분산 스토리지 시스템에서 클라이언트 기반 중복 제거를 위한 정보분산 알고리즘과 소유권 증명 기법을 제안한다. 제안하는 방법은 저장공간 뿐만 아니라 네트워크 대역 절감이 가능하여 높은 효율성을 얻을 수 있으며 신뢰할 수 없는 스토리지 서버와 악의적인 클라이언트로부터 안전성을 보장할 수 있다.

• 정보처리학회논문지A
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• 제10A권6호
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• pp.685-690
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• 2003

새로운 무선인터넷 디바이스로써 주목받고 있는 PDA는 기능 개선을 위해서 다양한 애플리케이션 개발이 이루어지고 있으며 수시로 응용프로그램이 설치되어지고 있다. 또한 PDA는 전원이 방전 될 경우에 RAM(Random Access Memory)에 저장되어 있는 데이터가 모두 삭제되는 단점이 있어서 그때마다 프로그램을 다시 복원해야 한다. 본 논문에서는 PDA의 응용 프로그램을 설치할 경우에 사용자가 직접 애플리케이션을 설치해야 하는 기존의 문제점을 해결하기 위하여 자동으로 PDA 응용프로그램이 설치되는 시스템(PAIS : PDA Automatic Installation System)을 제안하였다. 이 시스템을 적용한 경우 사용자에게는 설치에 소요되는 시간과 노력을 감소시켜 편의를 제공하고, 기업에게는 프로그램 설치관련 홍보물 제작에 소요되던 비용을 절감 할 수 있는 효과가 있다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2000년도 춘계공동학술대회 논문집
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• pp.160-163
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• 2000

Due to the complexities of the real-world system, a water resource management program has to deal with various types of data. It appears that management personnel who has to use the program usually suffers from the technical burdens of handling large amount of data and understanding the optimization theory when they try to interpret the results. By combining the capabilities of database technology and modeling technique with optimization procedure we can develop a reliable decision supporting tool for multi-reservoir operation planning, which yields operating schedule for each dam in a river basin. We introduce two special data handling methodology for the real world application. First, by treating dams, hydro-electric power generating facilities and demand sites as separate database tables, the proposed data handling scheme can be applied to general water resource system in Korea. Second, by assigning variable names using predetermined key words, we can save searching time for identifying the moaning of the variables, so that we can quickly save the results of the optimization run to the database.

• 로봇학회논문지
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• 제15권2호
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• pp.184-189
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• 2020

This paper is a study on data augmentation for small dataset by using deep learning. In case of training a deep learning model for recognition and classification of non-mainstream objects, there is a limit to obtaining a large amount of training data. Therefore, this paper proposes a data augmentation method using perspective transform and image synthesis. In addition, it is necessary to save the object area for all training data to detect the object area. Thus, we devised a way to augment the data and save object regions at the same time. To verify the performance of the augmented data using the proposed method, an experiment was conducted to compare classification accuracy with the augmented data by the traditional method, and transfer learning was used in model learning. As experimental results, the model trained using the proposed method showed higher accuracy than the model trained using the traditional method.

• 에너지공학
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• 제27권2호
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• pp.81-88
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• 2018

Every day a huge amount of paper is being used, most of them are thrown after using. This directly impacts on the environment. Therefore, waste paper management is necessity to protect the environment from its annihilation and pollution. Paper recycling products consist of printing paper, newspaper, corrugated containers, magazine paper and so on. Reuse waste paper will reduce the consumption of wood and virgin pulp as recycling one ton of newsprint can save approximately 1 ton of wood, meanwhile recycling 1 ton of printing paper can save more than 2 tons of wood. With increasing recycling rates, lower quality paper fractions may be included. Thus the selection of a paper recycling technology is a crucial first design consideration. The paper recycling must be accompanied by appropriate technology to manage a huge volume of wastepaper. The specific objectives of this study were as follows: (1) comprehensive literature reviews of paper production and consumption, (2) figure out about paper recovery and utilization, (3) investigate the paper recycling in the sustainable times, (4) introduce eco-friendly recycling technology to paper industry.

• 한국태양에너지학회 논문집
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• 제35권5호
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• pp.49-56
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• 2015

In this study a hybrid heating system based on geothermal source and solar heat was developed in order to save energy for greenhouse heating and its field performance was evaluated. Developed system are composed of following parts: water tank, heat exchanger, heat pump, fan coil unit and heat storage unit. The working performance test was carried out in a greenhouse cultivating oriental orchids being managed by $23^{\circ}C$. Field performance test results showed that average heating coefficient of performance ($COP_h$) was 3.4 for the period from mid-January to mid-March 2013. Heating coefficient of performance ($COP_h$) of developed hybrid heat pump system was more sensitive to water tank temperature than outside air temperature. This study showed that developed hybrid heat pump system has a potential to save the heating costs up to 91% compared to conventional agricultural oil heaters.

• 한국정보처리학회논문지
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• 제3권5호
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• pp.1187-1197
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• 1996

본 연구에서는 연구교육용 CAD 툴을 이용하여 이차원 디지탈필터를 설계 하고 모의 실험을 수행하였다. 이차원필터는 크게 일차원 디지탈필터와 선메모리 (line memory)로 구성되어있다. 일차원 디지탈필터에서의 속도 개선을 위하여 곱셈은 CSD (Canonical Signed Digit) 형태로 주어진 필터계수에 의하여 선이동방식 으로 수행 하며, 덧셈에는 CSA(carry-save adder)와 MA(Manchester adder)를 사용 하였다. 설계된 디지탈필터는, VHDL 모의실험의 경우 30 Mhz까지 동작하였으며, Berkeley CAD 툴에 의한 레이아웃 설계를 수행하여 IRSIM에 의하여 정상적인 동작을 확인하였다.

• 한국태양에너지학회 논문집
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• 제30권5호
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• pp.1-10
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• 2010

The aims of this study is to analyze that the double-skinned outer surface of building will be the effective measure to improve the use of space and save energy through the evaluation of the buildings renovation. In other words, it is significantly effective to increase the insulation of the outer surface where the most heat loss occurs; it is also energy-saving to convert the space created by pilotis in the southern and northern parts of the buildings into an double-skinned atrium. Research methods of this study are consisted with two steps, situation analysis and simulation analysis. IRISYS 1000 Series Imager was used for research of situation analysis and Visual DOE 4.0 was used for simulation analysis with the 1st Buildings of Jeju Special self-Governing Province. As results of simulation, it was proved that Double skin Method is more effective for green building than basic model. it was predicted to save 8.6% of energy by Double skin Method. Especially, in case of using of ventilation within double-skinned atrium, it was predicted that saving of energy was most effective than other method.

• 설비공학논문집
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• 제17권5호
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• pp.496-504
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• 2005

Heat recovery ventilators (HRV) are developed in order to satisfy both energy conservation and the improvement of indoor air quality as an alternative for current natural ventilation systems and local mechanical ventilation systems in kitchens and bathrooms. However, the performance of HRV system and the consequent effect on heating and cooling energy saving have not been sufficiently validated quantitatively in case of the application of HRVs in real residences. In this study, field measurement and computer simulation were conducted in both summer and winter period to assess the performance and validate energy conservation effect of HRVs. Under the Korea weather condition, average total heat recovery efficiency was $27\%$ in summer and $46\%$ in winter. According to the field measurement, HRV system can save the energy by $10\%$ in summer and 15$\%$ in winter. Furthermore, according to the simulation assessment, HRV system can save the energy by $17\%$ in summer and $17\%$ in winter.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제16권11호
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• pp.1066-1070
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• 2010

무선 네트워크 환경에서 단말기의 에너지 효율은 멀티미디어 스트리밍 서비스의 연속적인 이용을 위한 중요한 고려사항이다. 본 논문에서는 멀티미디어 스트리밍 서비스를 이용하는 무선 단말기의 에너지 효율을 향상시키기 위해서 IEEE 802.11e의 U-APSD(Unscheduled Automatic Power Save Delivery) 환경에서 동작하는 스트리밍 시스템인 BACASS(Buffer-Aware and Content-Aware Streaming System)를 제안하였다. BACASS는 SVC로 인코딩된 영상을 이용하는 네트워크 인지형 스트리밍 시스템을 기반으로, PSNR(Peak Signal to Noise Ratio)과 클라이언트 버퍼 정보를 이용해서 U-APSD의 DP(Doze Period)를 유도함으로써 에너지 효율을 향상 시킨다. 시뮬레이션 결과를 통해서 제안하는 BACASS가 단말기의 에너지 효율을 향상시킴을 보였다.