• 상하수도학회지
• /
• 제25권6호
• /
• pp.959-970
• /
• 2011

The frequent occurrence of sewer flooding and the intermittent discharge of non-point pollutions into the receiving water body are emerging issues recently due to the climate change and urbanization. These problems might be solved by introducing a multifunctional storage facility. Unlike a single-purpose storage facility, a multi-purpose storage facility should be operated at an instant to meet for flood prevention, reduction of non-point pollution and/or rainwater reuse. Considering various operational combinations it is suggested that prevention of sewer flooding coupled with reduction of non-point pollution is the most effective operational strategy for a multi-functional storage facility.

• 제어로봇시스템학회논문지
• /
• 제10권1호
• /
• pp.73-80
• /
• 2004

We have developed a general purpose motion controller using an FPGA(Field Programmable Gate Array). The multi-PID controllers and GUI are implemented as a system-on-chip for multi-axis motion control. Comparing with the commercial motion controller LM 629, since it has multi-independent PID controllers, we have several advantages such as space effectiveness, low cost and lower power consumption. In order to test the performance of the proposed controller, motion of the robot hand is controlled. The robot hand has three fingers with 2 joints each. Finger movements show that tracking was very effective. Another experiment of balancing an inverted pendulum on a cart has been conducted to show the generality of the proposed FPGA PID controller. The controller has well maintained the balance of the pendulum.

• Journal of the Optical Society of Korea
• /
• 제5권1호
• /
• pp.9-15
• /
• 2001

The ocean Scanning Multi-spectral Imager (OSMI) is a payload on the KOrea Multi-Purpose SATellite (KOMPSAT) to perform worldwide ocean color monitoring f the study of biological oceanography. OSMI performs solar and dark calibrations for on-orbit instrument calibration. The purpose of the solar calibration is to monitor the degradation of imaging performance for each pixel of 6 spectral bands and to correct the degradation effect on OSMI image during the ground station date processing. The design, the operation concept, and the radiometric characteristics of the solar calibration are investigated. A linear model of image response and a solar calibration radiance model are proposed to study the instrument characteristics using the solar calibration data. The performance of spectral responsivity and spatial response uniformity. The first solar calibration data and the analysis results are important references for further study on the on-orbit stability of OSMI response during its lifetime.

• 공학기술논문지
• /
• 제11권4호
• /
• pp.273-277
• /
• 2018

In the field of forest disaster prevention, drones are expected to save higher human resources than the existing manpower has, and produce high-efficiency results over time. However, operational limitations brought by short flight times have brought the environment of limited use of the various capabilities of the drone, and the existing development systems operating the multi-drone are mainly for performance purpose, so it is a difficult to use for forest disaster prevention. The purpose of this paper is to design the concept based on multi-drone operation procedure through analysis of mission of ground control system for forest disaster prevention.

• Journal of information and communication convergence engineering
• /
• 제21권1호
• /
• pp.45-53
• /
• 2023

This study constructs various scenarios required for landscape lighting; furthermore, a large-capacity general-purpose multifunctional controller is designed and implemented to validate the operation of the various scenarios. The multi-functional controller is a large-capacity general-purpose controller composed of a drive and control unit that controls the scenarios and colors of LED modules and an LED display unit. In addition, we conduct a computer simulation by designing a control system to represent the most appropriate color according to the input values of the temperature, illuminance, and humidity, using the neuro-control system. Consequently, when examining the result and output color according to neuro-control, unlike existing crisp logic, neuro-control does not require the storage of many data inputs because of the characteristics of artificial intelligence; the desired value can be controlled by learning with learning data.

• 한국안광학회지
• /
• 제20권1호
• /
• pp.35-42
• /
• 2015

목적: 콘택트렌즈 재질 및 렌즈에 침착된 단백질 종류에 따른 균의 흡착력을 비교하고 관리용품의 살균력 차이를 측정하고자 하였다. 방법: FDA 평가기준 및 방법인 Disinfection Efficacy Testing의 Part 2. Regimen Procedure For Disinfecting Regimens에 따라 균 흡착 및 관리용품의 살균력 측정실험을 실시하였다. 결과: 포도상구균을 제외한 녹농균, 세라티아균, 칸디다균은 etafilcon A 렌즈에 더 많이 흡착되었으며, 4종의 다목적용액은 칸디다균을 제외한 모든 균에서 거의 완벽한 살균력을 나타냈다. 눈물 단백질을 침착시킨 렌즈에서 세라티아를 제외한 모든 균은 알부민 침착 렌즈에서의 흡착이 많았으며, 다목적용액의 살균력은 라이소자임 침착 렌즈에 흡착된 균보다 알부민 침착 렌즈에 흡착된 균에서 높은 것으로 나타났다. 또한, 균의 종류에 따라 다목적 용액의 살균력이 달랐다. 결론: 균의 종류, 콘택트렌즈 재질, 침착된 눈물 단백질의 종류가 콘택트렌즈에 흡착되는 균의 양에 영향을 주며, 눈물 단백질의 침착은 다목적용액에 의한 살균력에 변화를 초래할 수 있음을 밝혔다. 이러한 살균력에 영향을 주는 요인에 의해 콘택트렌즈 위생상태가 달라지며 부작용 발생 여부가 영향을 받을 수 있음을 제안한다.

• 한국주거학회논문집
• /
• 제20권1호
• /
• pp.71-82
• /
• 2009

The purpose of our study is empirically to identify residents' satisfaction by multi-family public rental housing and to find out another improvement to solve the housing problems facing the poor in Daegu. As a new way of settling the housing problems for the poor in city, as you know, multi-family public rental housing program was introduced by the Korean government in 2004 but rarely empirically evaluated so far. in the Residents' Satisfaction, There are no evaluation of multi-family public rental housing program except Kim's study (2006). Based on 160 survey data, we evaluated the multi-family Public Rental Housing Program within the framework of affordability in economics, a satisfaction in building and in neighborhood by a statistical method. As a result, we find out that residents on multi-family Public Rental housing are satisfied with the multi-family Public Rental Housing Program by and large. For mitigating the housing and economic problem of the poor more, self-support program as well as assistance in housing are needed and multi-family Public Rental housing Program must include neighborhood program more.

• 한국공작기계학회논문집
• /
• 제16권3호
• /
• pp.37-43
• /
• 2007

Recent technological developments in machine tools have been focused on high speed, low vibration machining and high precision machining. And the concern with multi-functional machining has been increased for the last several years. Multi-tasking machines are widely used in machine tool industries. Laser multi-tasking machine has been developed for high precision and fewer vibration machining. The purpose of this study is to evaluate the effects of structural reinforcement on Laser multi-tasking machine which is comprehensively combined turning center and laser machine. Up to date, for the structural stability evaluation of a multi-tasking machine, the analysis model has been considered only the weight of the upper parts. The positions of upper parts on multi-tasking machine have not been considered in the model. So, the results of the present FE model have revealed some difference with measurement data in case of multi-tasking machine. Design of the machine and structural analysis is carried out by FEM simulation using the commercial software CATIA V5. In the result of the structural analysis, effectiveness of reinforcement of the bed was confirmed.

• Human Ecology Research
• /
• 제52권6호
• /
• pp.573-586
• /
• 2014

The purpose of this study was to review the conceptual framework of social constructionism and critical social constructionism in the research area of multi-cultural family homes, using a literature review. Fopp argued that social constructionism had an objectivation problem that only considered the actor side as a policy object; therefore he suggested a weaker social constructionist perspective with moderate relativism and the application of feminist epistemology to marginal life for maximizing objectivity. This article explores a conceptual framework for studying the reality of housing of multi-cultural families in Korea in the light of constructionist ideas and presents a review of empirical positivist data to support the framework. Based on results, using the social constructionist framework, five contexts (structural, institutional, organizational, operational, and intersubjective) were reviewed and ideas were suggested to develop an appropriate future situation for multi-cultural family homes. For a weaker social constructionist framework, three National Survey of Multi-Cultural Family Homes data sets were reviewed to determine the real condition of multi-cultural family homes. Further, from a feminist perspective, the empirical data of marginalized multi-cultural family homes were reviewed from the perspectives of gender inequality of decision making, cultural adaptation, and differentiation in housing related areas. In conclusion, two perspectives were useful for understanding multi-cultural family housing in Korea but must be compensated with substantial empirical data for a holistic approach.

• Journal of the Korean Society for Industrial and Applied Mathematics
• /
• 제24권3호
• /
• pp.243-291
• /
• 2020

In this paper, multi-block generalized backward differentiation methods for numerical solutions of ordinary differential and differential algebraic equations are introduced. This class of linear multi-block methods is implemented as multi-block boundary value methods (MB₂ VMs). The root distribution of the stability polynomial of the new class of methods are determined using the Wiener-Hopf factorization of a matrix polynomial for the purpose of their correct implementation. Numerical tests, showing the potential of such methods for output of multi-block of solutions of the ordinary differential equations in the new approach are also reported herein. The methods which output multi-block of solutions of the ordinary differential equations on application, are unlike the conventional linear multistep methods which output a solution at a point or the conventional boundary value methods and multi-block methods which output only a block of solutions per step. The MB₂ VMs introduced herein is a novel approach at developing very large scale integration methods (VLSIM) in the numerical solution of differential equations.