• 대한전기학회논문지:시스템및제어부문D
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• 제54권3호
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• pp.174-179
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• 2005

This paper presents 3D line segment extraction method, which can be used in generating 3D rooftop model. The core of our method is that 3D line segment is extracted by using line fitting of elevation data on 2D line coordinates of ortho-image. In order to use elevations in line fitting, the elevations should be reliable. To measure the reliability of elevation, in this paper, we employ the concept of self-consistency. We test the effectiveness of the proposed method with a quantitative accuracy analysis using synthetic images generated from Avenches data set of Ascona aerial images. Experimental results indicate that the proposed method shows average 30 line errors of .16 - .30 meters, which are about $10\%$ of the conventional area-based method.

• 한국실내디자인학회논문집
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• 제37호
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• pp.12-20
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• 2003

The purpose of this study is to propose a new design principles and to analyze the pattern of art and architecture applying fractal concepts. As this study is based on fractal geometry as a natural science, 1 intented to explain the concepts and provide some methods of generating fractal properties. Two major aspects are discussed. Frist, fractals are geometric shapes that are self-similar, in other words, they iterate a basic shape at ever increasing a decreasing dimensions. Self-similarity, irregularity, and scaling are fundamental characteristics of fractal geometry. Second, the fractal concepts of art and design can be analyzed and used as a critical tool. In both criticism and design, fractals provides a tool In fine, fractal geometry can be provided endless possibilities for artists and designers intended in expressing the more complex underlying rhythms and organic patterns of nature.

• Bulletin of the Korean Chemical Society
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• 제7권6호
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• pp.428-433
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• 1986

It is demonstrated by using a highly positive uranium ion as a test case that the exact relation between the small and the large components of a Dirac spinor in relativistic self-consistent-field (RSCF) calculations is not fully satisfied by the kinetic balance condition only even for two electron systems. For a fixed number of large component basis functions, total energies are sensitive to the change of the size of the small component basis sets even after the kinetic balance condition is fully satisfied. However, the kinetic balance condition appears to be a reasonable guideline in generating reliable and practical basis sets for most applications of RSCF calculations. With a complete small component basis set, energies from RSCF calculations exhibit a variational behavior, implying the stability of the present RSCF procedure.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 춘계학술대회
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• pp.441-445
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• 2009

본 논문에서는 Self-Programmable Cellular Automata(SPCA)를 기반으로 하여 최대주기수열을 생성하는 방법을 제안한다. 최근 긴 주기의 수열을 생성하기 위해서 CA의 차원을 증가시키거나, 상태전이 단계마다 각 셀의 전이규칙을 바꾸는 PCA를 사용하여 왔다. 본 논문에서는 셀의 전이 규칙에 역동성을 부여하기 위하여 각 셀의 상태전이 규칙을 각 시간 단계마다 바꿈으로써 더 긴 주기의 수열을 생성하고 생성된 수열의 랜덤성을 높이고자 한다.

• 한국환경농학회지
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• 제15권1호
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• pp.116-127
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• 1996

일본 공개특허공보에 명시된 내용을 주요 자료로 하여 무논 투척처리용 점보제의 연구동향을 파악하고, 액상제제의 수중 확산성 측정실험을 통하여 점보제의 연구방향을 설정하고자 하였다. 일본에서 점보제의 연구는 발포성 제제와 액상농약 포장제제를 중심으로 하여 이루어지고 있었다. 발포성 점보제의 연구는 처리지점에서 농약이 고농도로 집적되는 현상을 극복하는데 노력이 집중되고 있으나, 범용적인 제법의 확립과 실용화에는 더 많은 시일이 소요될 것으로 생각되었다. 반면에 액상농약 포장점보제는 비교적 최근에 유화용출형 제제를 중심으로 연구되어 왔으며, 제조방법과 제제의 성능면에서 발포성 점보제에 비하여 실용화 가능성이 더 큰 것으로 판단되었다. 유제의 수중 확산성은 액상수화제보다 좋았으며, 수면의 부유물에 의해 확산이 저해되었으나 그 정도는 크지 않았다. 또한 유제의 비중이 1보다 작을 때 수중 확산성이 우수하여 유화용출형 점보제의 개발 가능성은 충분한 것으로 사료되었다.

• Journal of Power Electronics
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• 제5권2호
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• pp.109-119
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• 2005

This paper deals with the performance analysis of static compensator (STATCOM) based voltage regulator for self­excited induction generators (SEIGs) supplying balanced/unbalanced and linear/ non-linear loads. In practice, most of the loads are linear. But the presence of non-linear loads in some applications injects harmonics into the generating system. Because an SEIG is a weak isolated system, these harmonics have a great effect on its performance. Additionally, SEIG's offer poor voltage regulation and require an adjustable reactive power source to maintain a constant terminal voltage under a varying load. A three-phase insulated gate bipolar transistor (IGBT) based current controlled voltage source inverter (CC- VSI) known as STATCOM is used for harmonic elimination. It also provides the required reactive power an SEIG needs to maintain a constant terminal voltage under varying loads. A dynamic model of an SEIG-STATCOM system with the ability to simulate varying loads has been developed using a stationary d-q axes reference frame. This enables us to predict the behavior of the system under transient conditions. The simulated results show that by using a STATCOM based voltage regulator the SEIG terminal voltage can be maintained constant and free from harmonics under linear/non linear and balanced/unbalanced loads.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제41회 하계 정기 학술대회 초록집
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• pp.211-211
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• 2011

Nanostructures, with a diversity of shapes, built on substrates have been developed within many research areas. Lithography is one powerful, but complex, technique to make structures at the nanometer scale, such as platinum nanowires for studying CO catalytic reactions [1], or aluminum nanodisks for studying the plasmon effect [2]. In this work, we approach a facile method to construct nanostructures using noble metals on a titania thin film by using self-assembled structures as a pattern. Here, a large-scale silica monolayer is transferred to the titania thin film substrates using a Langmuir-Blodgett trough, followed by the deposition of a thin transition metal layer. Owing to the hexagonal close-packed structure of the silica monolayer, we would obtain a metal nanostructure that includes separated metallic triangles (islands) after removing the patterning silica beads. This nanostructure can be employed to investigate the role of metal-oxide interfaces in CO catalytic reactions by changing the patterning silica particles with different sizes or by replacing the oxide support. The morphology and chemical composition of the structure can be characterized by scanning electron microscopy, atomic force microscopy and X-ray photoelectron spectroscopy. In addition, we modify these islands to a connected island structure by reducing the silica size of the patterning monolayer, which is utilized to generating hot electron flow based on the localized surface plasmon resonance effect of the metal nanostructures.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제11권3호
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• pp.91-98
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• 2022

최근 가상공간과 물리공간이 디지털 융합된 메타버스에 대한 관심이 높아지면서 물리공간에서의 많은 활동이 웹 기반의 가상공간에서 이루어질 전망이다. 따라서 분산 식별자 기반 가상공간 환경에서 사생활과 상호 신뢰를 확보할 수 있는 자기주권 신원시스템에 대한 연구가 요구된다. 본 논문에서는 분산 식별자 기반 자기주권 신원시스템을 위해 Hyperledger Indy와 DIDComm 오픈 소스를 기반으로 분산 식별자, 비대칭 키, DID 문서를 생성하여 블록체인과 지갑에 등록하는 절차, DIDComm 메시지로 구성된 신뢰할 수 있는 통신 방법을 개발하고 검증하였다. 이는 통신 참여자 간의 신뢰를 위한 추가적인 정보 교환 및 검증 가능한 자격증명을 교환하여 서로를 검증하는데 활용이 가능하다

• 한국산업융합학회 논문집
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• 제26권6_2호
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• pp.1047-1053
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• 2023

An experimental study was performed on the collision nozzle system that generates microbubble by air self-suction using a venturi nozzle. This study experimentally investigates the pressure of a pump and a dissolution tank, water flow rate, air self-suction amount and microbubble generation amount. The experimental conditions were varied by changing the diameter of the collision nozzle (d_e=4,5,6,7,8mm), the pumping power(0.5hp, 1.0hp) and the capacity of the dissolution tank(4.4L, 8/8L). The pressure change of the pump according to the outlet diameter of the collision nozzle showed that the 1.0hp pump power operated more stably than the 0.5hp pump. The pressure change in the dissolution tank was shown to decrease rapidly as the outlet diameter of the nozzle increased. The flow rate of recirculating water was shown to increase as the nozzle diameter increased. Additionally, it was shown that the pump capacity of 1.0hp increased the flow rate more than that of 0.5hp. The self-suction air flow rate was shown to occur above d_e=6mm, and the air flow rate increased as the nozzle diameter increased. Also, as the pump capacity increased, the self-suction amount of air increased. It was shown that the amount of microbubble less than 50mm generated was maximum when the nozzle diameter was 6mm, the pump power was 1.0hp, and the dissolution tank capacity was 8.8L.

• 가정과삶의질연구
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• 제27권3호
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• pp.201-212
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• 2009

The purpose of research is to investigate patterns and diffusion of consumer participation on Internet UCC based on digital contents services. A sample survey of internet users was conducted, responses were collected from 629 respondents and consumer streaming data were analyzed. Some of the practical implications of the results are follows. Research can find out that patterns of user participation in UCC. The major genres of UCC are like daily lives of individuals, humors, parodies of star entertainers and types of contents like still pictures or images, texts are relatively highly generated comparing with multimedia UCC. Although participants have been being increased in UCC recently, the consumers as prosumers who are classified in contents generating group are ten percents at the most. In generating community-based UCC such as posting answers of questions and activities in Blog, prosumers who are in contents making group(recreational group) show more positive attitudes than simple participants(consuming only). The results of multiple regression analysis indicated that fun & entertainment, arousal, self-expression, user friendly web interface variable commonly posited a significant effect in multimedia UCC Services between two groups. Information sharing and perceived usefulness posited a significant effect in recreational group.