• 한국산업융합학회 논문집
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• 제25권2_2호
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• pp.193-198
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• 2022

In this paper, we introduce the improved control method are communicated between a master and a slave robot in the teleoperation systems. When the master and slave robots are located in different places, time delay is unavoidable under the network environment and it is well known that the system can become unstable when even a small time delay exists in the communication channel. The time delay may cause instability in teleoperation systems especially if those systems include haptic feedback. This paper presents a control scheme based on the estimator with virtual master model in teleoperation systems over the network. As the behavior of virtual model is tracking the one of master model, the operator can control real master robot by manipulating the virtual robot. And LQG/LTR scheme was adopted for the compensation of un-modeled dynamics. The approach is based on virtual master model, which has been implemented on a robot over the network. Its performance is verified by the computer simulation and the experiment.

• Nuclear Engineering and Technology
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• 제53권3호
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• pp.894-900
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• 2021

This paper examines sorption of Pd(II) onto illite, MX-80 bentonite, and Queenston shale in Na-Ca-Cl solutions of varying ionic strength (IS) from 0.01 to 6.0 mol/L (M) and pH_c ranging from 3 to 9 under atmospheric conditions. A 2-site protolysis non-electrostatic surface complexation and cation exchange model was applied to the Pd sorption onto illite and MX-80 using PHREEQC, and the model results were compared to the experimental ones obtained in this work. Surface complexation and cation exchange constants were estimated for both illite and MX-80 through the optimization process to bring the predicted distribution coefficients from the model into alignment with the experimentally derived values. These optimized surface complexation constants were compared to existing linear free energy relationships (LFER).

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제3권11호
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• pp.471-478
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• 2014

데이터베이스 복제(Replication)는 분산 데이터베이스 환경에서 신뢰성, 가용성, 과부하 방지 등을 위하여 이용되며, 마스터/슬레이브(Master/Slave), 멀티마스터(Multi-Master)와 같이 두 가지 모델이 존재한다. 멀티마스터 데이터베이스는 다중 데이터베이스에 삽입 및 갱신을 위한 동기화에 따른 복잡도 증가와 비용 증가와 같은 문제를 지닌다. 이러한 이유로 데이터의 삽입과 수정이 빈번히 일어나는 환경에는 마스터/슬레이브 모델을 이용한 데이터베이스 복제가 적합하다. 하지만 마스터/슬레이브 데이터베이스 역시 시스템에서 각 트랜잭션이 마스터로 접속해야 할지, 슬레이브로 접속해야 할지를 선택하기 위한 기준이 명확히 존재하지 않는 문제를 지닌다. 따라서 이 연구에서는 마스터/슬레이브 데이터베이스 모델에서 AOP(Aspect Oriented Programming) 기반의 데이터베이스 트랜잭션 라우팅 알고리즘을 제안한다. 이를 위하여 AOP에 기반하여 애플리케이션을 횡단 관심사로 분리하고 각 관심사들을 모듈화 하여 트랜잭션을 마스터 데이터베이스 및 슬레이브 데이터베이스로 라우팅한다. 이 논문은 시나리오 기반의 기능 통합 테스트를 통하여 제안 알고리즘의 안정성(Stability) 및 성능이 우수함을 평가한다.

• 산업공학
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• 제9권2호
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• pp.129-141
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• 1996

Recently, the tire mold of a passenger car is made almost via aluminum casting, and it is necessary to prepare a master model of the tire for the casting. Because of the geometrical feature of tire, as well known, the master model must be machined by a 5-axis NC machine. The paper proposes a procedure to model and machine the master model. The approach includes (a) transformation of 2D drawing of tire into 3D geometry, (b) modeling surfaces of tire, and (c) inverse kinematics of a 5-axis NC machine. An implementation of the proposed procedure is also presented.

• 환경영향평가
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• 제9권4호
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• pp.323-338
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• 2000

A Korean air dispersion modeling software, AirMaster, was developed on a basis of dispersion theories adopted in U.S. EPA's ISC3 (Industrial Source Complex - version 3) model to assess the air quality impact from the stacks. Key characteristics of AirMaster are as follows: 1) The building downwash effect can be easily simulated; 2) The screen, long term, and short term models can be run independently; 3) The input data to run the model such as meteorological and terrain data are supplied automatically from the databases in AirMaster; and 4) The modeling procedure is easy and simple under the GUI window environment. In order to validate AirMaster, comparisons with ISC3 model and Indianapolis tracer experiment were carried out. It was shown that AirMaster was identical to ISCST3 and ISCLT3 models in predicting the 1 hr to annual concentrations from the stack under various stack emission and meteorological conditions. The 1 hr concentrations predicted by AirMaster also showed a good agreement with the Indianapolis tracer measurements.

• 한국지하수토양환경학회지:지하수토양환경
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• 제6권3호
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• pp.61-71
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• 2001

A regional master recession curve model to predict groundwater discharges in a given basin was presented. Considering a stream-aquifer system, both theoretical and experimental baseflow equations were compared and a practical groundwater discharge equation was derived, The groundwater discharge equation was expanded and transformed to the discharge equation at the basin exit. For practical use, the equation was expressed as a function of watershed area, the mean slope of basin and the recession constant. To verify the model, the model was applied to Ssang-chi basin where long-term and temporal hydrological data at the upper basin were collected. Our results show that a master recession curve of unmeasured area can be predicted.

• Journal of Radiation Protection and Research
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• 제30권2호
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• pp.61-67
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• 2005

노심설계 해석체계로 사용하는 HELIOS-MASTER코드를 이용하여 SAMRT연구로 사용 후 핵연료 저장조에 대한 임계도 해석체계를 개발하였다. 저장조의 기하학적 모형에 대한 거시 단면적을 HELIOS코드를 이용하여 생산하고, 저장조의 3차원 모델에 대한 임계도를 MASTER코드로 평가하였다. 또한 3차원 MCNP계산을 통하여 HELIOS-MASTER체계를 이용한 임계도 평가의 타당성을 검증하였다 HELIOS-MASTER코드 체계를 이용한 임계도 해석결과가 약간 보수적인 방향으로 허용오차 범위 내에서 정확도를 유지하였다. HELIOS-MASTER 코드 체계는 3차원 연소계산이 가능하기 때문에 차후에 연소이력을 고려한 사용후 연료 저장조에 대한 임계해석에 유용할 것이다.

• 한국주거학회논문집
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• 제19권6호
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• pp.9-20
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• 2008

The residential environment is a place which reflects the gradual evolution of human consciousness because it is a cultural space the term, 'houses' is not relevant in this context as it literally means 'contains'. The long history of human living habits cannot be 'contained' within a space, but can be 'expressed' by a space and by the way the space is used. Furthermore, due to the way it is typically constructed, the basic characteristics of the house usually cannot be rapidly changed to accommodate new habits. However, recent changes that have taken place to the characteristics of the traditional master room suggest that traditional societal values associated with patriarchy have diminished. The current trend where priority is given to children's education also affects such a change. Existing researches related to the master room is confined to the behavioral use of the space and the composition of the physical space, while research on the master room its plane type has not been carried out. Therefore, in this study, apartment model houses are selected, and are classified according to the types of master room. An analysis is then carried out of the master room based on the occupants' requirements in terms of consciousness. Any planning modifications where required are then suggested. This research comprises the followings stages. First, an examination is carried out of existing research on the master room in order to understand its background and spatial components. A definitiones of related terms is also provided. Second, an analysis is carried out of the model houses exhibited at Suwan District, examining the typical standard that has been selected for the master room. Third, an analysis is conducted of the topics and questions to be selected for a questionnaire. Fourth, an analysis is carried out of the consciousness, satisfaction and requirements of the residents, as respondents in the questionnaire, related to the master room. and Research is then conducted of the architectural methods for planning the master room. Finally, future countermeasures for planning the master room are described based on the above analysis and research findings.

• International Journal of Precision Engineering and Manufacturing
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• 제9권3호
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• pp.75-78
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• 2008

Tire molds are manufactured by aluminum casting, direct five-axis machining, and electric discharging machining. Master models made of chemical wood are necessary if aluminum casting is used. They are designed with a three-dimensional computer-aided design system and milled by a five-axis machine. In this paper, a method for generating and machining a tire surface model is proposed and demonstrated. The groove surfaces, which are the main feature of the tire model, are created using a parametric design concept. An automatically programmed tool-like descriptive language is presented to implement the parametric design. Various groove geometries can be created by changing variables. For convenience, groove surfaces and raw cutter location (CL) data are generated in two-dimensional drawing space. The CL data are mapped to the tread surface to obtain five-axis CL data to machine the master model. The proposed method was tested by actual milling using the five-axis control machine. The results demonstrate that the method is useful for manufacturing a tire mold.

• 제어로봇시스템학회논문지
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• 제17권3호
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• pp.254-257
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• 2011

This study was performed to development a dental three-dimensional laser scanning system and measure the accuracy of new adjustable lower dental impression trays. Multiple impressions of a resin master model were made with custom, stock and new adjustable trays and vinyl polysiloxane impression material. The lower master model and resulting cast were compared using an dental scanning system. Each 3D image was superimposed onto the lower master model image and analyzed with custom software. Multiple measurements of the lower master model and casts were analyzed to determine the accuracy of tray types.