• 한국컴퓨터정보학회논문지
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• 제28권11호
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• pp.125-134
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• 2023

본 논문은 함정 전투체계에서 효율적인 탐색레이더 연동단 설계 방법을 제안한다. 제안된 탐색 레이더 연동단은 함정 전투체계 소프트웨어에서 공용화 모듈(Module)을 표준화한 구조를 적용하였다. 링크(Link)별 오류탐지 기능을 구현하여 링크 단절시 링크 단절에 대한 인지 속도를 높였다. 또한 HCI(Human-Computer Interaction)를 위해 주기적으로 전송하던 메시지를 데이터그램(Datagram)의 변화가 있을 때만 송신하여 콘솔(Console)의 처리 부하를 줄일 수 있다. 특히 제안 방법은 함정에서 저가형 상용 탐색레이더 채택 등으로 프로세싱(Processing) 능력이 뛰어나지 못한 경우 사격에 대한 명중 확인 및 영점 조절과 관련하여 워터폴 스코프(Waterfall Scope)와 시간 제한 물기둥 인지 방법으로 탐색레이더의 기능을 보완해줄 수 있다. 이를 통해 운용자의 사격 명중 판단이 용이해지고, 오인지 확률을 줄일 수 있으며, 탐색레이더의 가용자원을 추가로 확보할 수 있다.

• 한국환경과학회지
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• 제33권1호
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• pp.1-8
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• 2024

When situated in green landscapes, water bodies play a crucial role in positively influencing mood and mental health, yet research on the cognitive mechanisms underlying these therapeutic effects is lacking. This study is intended to examine differences in brain function among adult males exposed to forest landscapes with or without water bodies. The wooded landscapes included views of a waterfall, a valley, and a forest without water. The control group was exposed to a local urban landscape. Twelve adult males participated in a field experiment in which prefrontal cortex (PFC) activity was measured using near-infrared spectroscopy (NIRS). In the experiment, participants engaged in low-intensity walking in three forested areas with similar vegetation and climatic conditions. Participants showed significant differences in left PFC activity depending on whether they were in the three forested landscapes or in the control landscape (P < 0.01). An analysis of variance (ANOVA) confirmed that significantly lower left PFC activity was recorded in the wooded landscape containing a water view . Notably, the lowest PFC values recorded in the landscape with a waterfall view suggest that landscapes with dynamic water flow may be associated with greater therapeutic benefits in terms of PFC activity than static landscapes. Our results underscore that water is a critical aspect of a landscape due to its therapeutic benefits and should be incorporated in the planning and design of green spaces for health promotion.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2004년도 가을 학술발표논문집 Vol.31 No.2 (2)
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• pp.445-447
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• 2004

최근의 정보시스템 개발은 컴포넌트 기반 소프트웨어 개발로서 반복적인 소프트웨어 개발 공정을 따른다 반복(Iteration)이란 정보시스템 개발 생명주기(SDLC)의 요구사항, 분석, 설계, 개발, 테스트 과정을 기존의 Waterfall방식으로 개발하지 않고, 각 단계들을 반복적으로 수행하여 시스템을 개발하는 방식이다. 따라서 기존의 단계, 액티비티 그리고 하위의 타스크에 해당하는 산출물 완성유무를 가지고 프로세스 측면의 공정 진척을 적용하게 되면 프로젝트 현 시정의 공정 상태를 명확하게 파악하는 것이 불가능하다. 본 연구에서는 최근의 컴포넌트 기반 소프트웨어 개발에서 요구되어지는 유스케이스 기반의 프로덕트 중심의 공정 진척 관리에 필요한 기법들을 연구하였다. 본 논문에서는 유스케이스가 분석, 설계, 개발, 테스트, 배포되는 과정에 있어서 산출물 기반 진척관리에 대한 기법을 제안함으로서 반복적인 소프트웨어 개발에서의 진척 관리 체계화를 증대할 수 있는 기법을 제시한다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 추계학술대회논문집
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• pp.641-645
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• 2008

In this paper, vibration sources of the BLOC motor are identified and the motor vibrations are reduced by structural modification. For vibration characteristic identification, vibration signals measured by an accelerometer when the BLOC motor is moving. These signals are presented in a waterfall plot in order to find the dependency of frequency components on the motor speed. It is found that main vibration source is BLOC motor test rig. From finite element analyses and some experiments, it is also found that resonances occur because the natural frequencies of the test rig exist in usual driving speed rang. To shift the natural frequencies outside the driving rang, the test rig is modified increase stiffness. It is verified that considerable amount of vibration are reduced by the structural modification.

• International Journal of Contents
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• 제2권2호
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• pp.1-5
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• 2006

The modeling and animation of natural phenomena have received much attention from the computer graphics community. Synthetic of natural phenomena are required for such diverse applications as flight simulators, special effects, video games and other virtual realty. In special effects industry there is a high demand to convincingly mimic the appearance and behavior of natural phenomena such as smoke, waterfall, rain, and fire. Particle systems are methods adequate for modeling fuzzy objects of natural phenomena. This paper presents particle system API(Application Program Interfaces) for generating special effects in virtual reality applications. The API are a set of functions that allow C++ programs to simulate the dynamics of particles for special effects in interactive and non-interactive graphics applications, not for scientific simulation.

• 산업기술연구
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• 제24권B호
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• pp.83-87
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• 2004

A reduced structure model of a wind turbine generator is designed and manufactured. Mode data are obtained by modal testing and analytical method. Vibration response is measured and investigated under various speed condition by using a waterfall plot. Possibility of severe resonance is observed and the mechanism is explained by using the mode data. Simplified theoretical model gives the 1st resonance frequency of wind turbine structure model. The theoretical model can be applied in the design stage of the wind turbine structure to avoid the severe resonance problem.

• Journal of information and communication convergence engineering
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• 제18권3호
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• pp.194-200
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• 2020

Cities in Indonesia include diverse scattered industrial centers comprising industries that can sustain the existing economic pace. For industrial data collection, the city government still relies on census that consumes extensive time and money. The public are unfamiliar with industries owing to their lack of industry information; therefore, the market share is not optimal. In addition, the opportunity to procure investors for business development is limited. A Geographic Information System (GIS) is a computer system that can record, store, write, analyze, and display geographical data. Using the Rapid Application Development (RAD) method, GIS was developed on a website platform to provide information on industry profiles, types of production, investment values, industry maps, and industrial locations in each village and sub-district to a wider community. The RAD method was chosen compared to the waterfall method because it could accelerate website development process.

• ETRI Journal
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• 제34권4호
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• pp.629-632
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• 2012

This letter investigates the combination of the Chase-2 and sum-product (SP) algorithms for low-density parity-check (LDPC) codes. A simple modification of the tanh rule for check node update is given, which incorporates test error patterns (TEPs) used in the Chase algorithm into SP decoding of LDPC codes. Moreover, a simple yet effective approach is proposed to construct TEPs for dealing with decoding failures with low-weight syndromes. Simulation results show that the proposed algorithm is effective in improving both the waterfall and error floor performance of LDPC codes.

• 한국소음진동공학회논문집
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• 제21권6호
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• pp.546-552
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• 2011

In this study, noise sources of a reducer which is combined a spiral bevel gear and a planocentric gear are identified by experimental method and the noise was reduced by the structure modification of the reducer. In order to identify the noise sources, noise and vibration signals were measured by microphone and accelerometer and these signals were analyzed with waterfall plot. In addition, the frequency response functions were obtained to prove the noise and vibration sources. It was found that the resonance was generated by the gear mesh frequencies and natural frequency of the reducer. The noise of the reducer could be reduced by structure modification.

• 산업기술연구
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• 제26권A호
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• pp.81-88
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• 2006

The Chun-cheon Citizen's Bell was cast in memory of hosting the 2010 world leasure conference and a striking ceremony was held at the city hall on December 31, 2005. In this study, vibration and sound of the bell are measured and the property of the magnificent sound of the bell is scientifically investigated. Frequency components making the sound are identified and how the frequency components decrease with time is observed using waterfall plot(3-dimensional frequency spectrum). Beat characteristics of the hum(1st frequency) and the fundamental(2nd frequency)are examined by experiment. Directivity of the sound radiation of the bell is examined by measuring the vibration and sound in several directions. Duration of the vibration and the sound is estimated using damping ratio.