• 벤처창업연구
• /
• 제4권2호
• /
• pp.21-58
• /
• 2009

The Purpose of this study is working out of the scientific-theoretical and practical recommendations directed on perfection of strategic planning of development of the enterprises of mining and gold mining branch. The methodological basis of research is based on the economic theory developed by a domestic and foreign science. At processing, generalisation and a writing of materials of the master's thesis following methods were applied: - supervision, - comparison, - the analysis and synthesis, - methods of an induction and deduction, - statistical groupings, - average and relative sizes, - the system approach. Finally, the theoretical and practical importance of this research consists that results of research will allow generating a basis of statement of effective system of strategic planning of a long-term sustainable development of the gold mining enterprises reducing risk of acceptance of inefficient strategic decisions. I would like to express many thanks to the NGO "Semey- My Home" and "EastGeoResources" LLP for their help and support in providing the data collection and data analysis stages of my research from 2006.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2009년도 춘계학술대회 논문집
• /
• pp.360-364
• /
• 2009

To verify the suitability of the Railroad safety requirements analysis, the actions of the function which it follows in a given operation condition are composed of the rule model or the state model. And it test must be possible. The subject of condition transfer in compliance with the transfer condition which is an event of system it will be able to accomplish the operation of system. However, tasks allocated to the actor are the duty which is added in organization. This time, the start of duty task is started in compliance with an external or internal condition. If there are 9 tasks which have one objective, the relationship among the previous and the current internal tasks and next tasks which will given is able to show in logical model. Thus when planning an organization, the integral part of class must include Task, Role and Position. And this time we make a series of outputs of examination of organizing model and examples to meet the capable skill.

• 한국수학교육학회지시리즈A:수학교육
• /
• 제34권1호
• /
• pp.17-63
• /
• 1995

The exploration of Mathematics-learningmodel on the basis of Cognitive development The purpose of this paper is to sequenctialize Mathematics-learning contents, and to explore teaching-learning model for mathematics, with on the basis of the theory of cognitive development and the period of condservation formation for children. The Specific topics are as follows: (1) Systemizing those theories of cognitive development which are related to Mathematics - learning for children. (2) Organizing a sequence of Mathematics - learning, on the basis of experimental research for the period of conservation formation for children. (3) Comparing the effects of 4 types of teaching - learning model, on the basis of inference activity and operational learning principle. $\circled1$ Induction-operation(IO) $\circled2$ Induction-explanation(IE) $\circled3$ Deduction-operation(DO) $\circled4$ Deduction-explanation(DE) The results of the subjects are as follows: (1) Cognitive development theory and Mathe-matics education. $\circled1$ Congnitive development can be achieved by constant space and Mathematics know-ledge is obtained by the interaction of experience and reason. $\circled2$ The stages of congnitive development for children form a hierarchical system, its function has a continuity and acts orderly. Therefore we need to apply cognitive development for children to teach mathematics systematically and orderly. (2) Sequence of mathematical concepts. $\circled1$ The learning effect of mathematical concepts occurs when this coincides with the period of conservation formation for children. $\circled2$ Mathematics Curriculum of Elementary Schools in Korea matches with the experimental research about the period of Piaget's conservation formation. (3) Exploration of a teaching-learning model for mathematics. $\circled1$ Mathematics learning is to be centered on learning by experience such as observation, operation, experiment and actual measurement. $\circled2$ Mathematical learning has better results in from inductional inference rather than deductional inference, and from operational inference rather than explanatory inference.

• 한국자동차공학회논문집
• /
• 제2권4호
• /
• pp.27-38
• /
• 1994

In this paper, a simplified model of a hydraulic actuator system for a low-band type active suspension system is derived. To reduce the order of model, time constants of each chamber in hydraulic system are neglected except that of an accumulator. And the dynamics of a spool in the pressure control valve is regarded as a first-order system. The step response and the frequency response of the simplified second-order simulation model exhibit a good agreement with those of the actual system as well as those of the tenth-order simulation model. It is possible to simplify the tenth-order model to the second-order one. The low-band type active suspension model is built up by combining of a quarter car model test rig to testify the validity of the simplified model. The experimental results of suspension characteristics show that the simplified second-order hydraulic actuator model is reasonable to describe the dynamics of the actual hydraulic actuator system for a low-band type active suspension system.

• 동력기계공학회지
• /
• 제15권5호
• /
• pp.16-21
• /
• 2011

The large scale decisive battle will be gradually reduced on the sea in the future and surface combatant ship installed advanced weapon units as well as propulsion system will be continuously increased. The high level of military technology leads to appear state-of-the-art weapon system using high power energy. As a results, fossil fuel powered main prime mover as diesel engine and gas turbine which are composed of mechanical propulsion system should be decreased from combatant ship in the near future. The new building naval combatant ship with the latest technology has electric based propulsion method of the hybrid type combined with mechanical and electrical drive. U.S. and Royal Navy, especially, select the integrated fully electric based propulsion system for the next generation combat ship and play an important roll for developing them. In this context, this paper was focused on the deduction of implications through analyzing the combatant ship propulsion system using diesel and gas turbine engine which are promoted on the worldwide.

• 한국건설관리학회논문집
• /
• 제17권3호
• /
• pp.143-155
• /
• 2016

최근 건설 중장비 운용의 용이성 향상, 작업 효율성 제고 및 안전성 향상을 위해 어라운드 뷰 모니터링(Around View Monitoring) 시스템을 건설 중장비에 적용하려는 시도가 증가하고 있다. 그러나 현재까지 개발된 대부분의 선행기술은 차량형 장비를 위해 개발되었으며, 일부 건설 중장비에 적용되고 있는 AVM 시스템의 경우도 원천기술이 차량형 장비를 대상으로 개발됨에 따라 건설 중장비의 특성을 반영하지 못하고, 탑뷰로 표현할 수 있는 영역이 제한된다는 한계점을 지닌 것으로 분석되었다. 따라서 본 연구의 목적은 건설 중장비에 특화된 건설 중장비 AVM 시스템의 파일럿타입을 개발하는 것이다. 이를 위해 본 연구에서는 선행연구 및 기술개발동향 분석, 개발 요구사항 도출, 최적 센서 선정, 시스템 디자인, AVM 알고리즘 구축 등을 수행하여 건설 중장비 AVM 시스템 파일럿타입의 개발하고, 실험실 실험을 통해 시스템의 개선요구사항을 도출하였다. 개발된 시스템을 활용한 실험실 실험 결과, 최소 20fps 이상의 영상 Refresh Rate를 확보함에 따라 장비주변의 현황(장애물, 사람 등)에 대한 실시간 모니터링이 가능하고, 앵글 센서(Angle Sensor)를 통해 수집된 데이터를 토대로 붐, 암, 버킷의 현황이 AVM 디스플레이 위에 적합하게 표현되는 것을 확인할 수 있었다. 또한 1)AVM 영상의 품질 향상을 위한 보간(Interpolation) 방법의 개선, 2)다양한 건설 중장비 유형 및 제원에 적용 가능할 수 있도록 이를 지원하는 칼리브레이션(Calibration) 모듈의 개발이 필요한 것으로 분석되었다.

• Journal of Electrical Engineering and Technology
• /
• 제11권4호
• /
• pp.801-809
• /
• 2016

The electrically excited synchronous generator (EESG) is applied in wind turbine systems recently. In an EESG control system, electrical torque is affected by stator flux and rotor current. So the control system is more complicated than that of the permanent-magnet synchronous generator (PMSG). Thus, the higher demanding of the control system is required especially in case of wind turbine mechanical resonance. In this paper, the mechanism of rotor speed resonant phenomenon is introduced from the viewpoint of mechanics firstly, and the characteristics of an effective damping torque are illustrated through system eigenvalues analysis. Considering the variables are tightly coupled, the four-order small signal equation for torque is derived considering stator and rotor control systems with regulators, and the bode plot of the closed loop transfer function is analyzed. According to the four-order mathematical equation, the stator flux, stator current, and electrical torque responses are derived by torque reference step and ramp in MATLAB from a pure mathematical deduction, which is identical with the responses in PSCAD/EMTDC simulation results. At last, the simulation studies are carried out in PSCAD software package to verify the resonant damping control strategy used in the EESG wind turbine system.

• 한국산림과학회지
• /
• 제82권2호
• /
• pp.128-138
• /
• 1993

본 연구는 한국(韓國)의 임업실정(林業實情)에 부합되는 산림소득세(山林所得稅)의 개선방안(改善方案)을 다루고 있다. 특히, 그러한 개선방안(改善方案)이 결과적으로 임업투자(林業投資)를 촉진시킬 수 있도록 하기 위한 특별한 고려가 이루어졌다. 현행 산림소득세제(山林所得稅制)와 같이 인공조임목(人工造林木)에 대한 완전면제(完全免除)보다는 임업투자(林業投資)가 이루어지는 즉시 손금(損金)으로 처리할 수 있는 제도의 확립이 매우 중요하다는 것을 연구결과(硏究結果)를 통하여 밝혔으며, 이에 대한 구체적인 적용방법(適用方法)등에 관하여도 다각적인 검토가 이루어졌다. 또한, 이러한 제도는 이미 선진국(先進國)의 경우에 있어서도 보편적으로 채택되고 있음을 제시하고 있다.

• 한국건설관리학회논문집
• /
• 제19권4호
• /
• pp.3-11
• /
• 2018

건설근로자공제회는 "고용복지와 퇴직공제 서비스로 건설근로자의 고용개선 및 생환안정에 기여"라는 목표로 여러 전략과제를 수행하고 있는데, 퇴직공제제도에 대한 과제가 그 중 하나이다. 퇴직공제제도는 일용직의 특성상 퇴직금 등 근로기준법상의 보호를 제대로 받지 못하는 건설근로자의 노후 소득과 생활보장을 위한 제도이며, 건설근로자공제회에서는 제도의 확산 및 효율적 관리를 위해 전자인력관리제 도입을 추진해 왔다. 2015년 9월부터 시작한 전자인력관리 시범사업은 금융형 전자카드(RFID기술기반) 및 지문을 이용하여 건설근로자들의 근로내역을 신고하고 퇴직공제부금을 납부하는 것으로 2017년 8월까지 총 36개의 건설현장에 적용되고 있다. 시범사업장의 효율적인 관리와 향후 추진계획을 위해 각 시범사업현장에 대한 현황 및 운영실적의 평가뿐만 아니라 전체 시범사업장의 종합적인 평가가 필요하다. 따라서 본 연구에서는 전자 인력관리 시범사업의 현황을 일괄적으로 평가하기 위한 성과지표를 개발하고 실제 적용을 통해 시범사업현장의 실태를 분석한 뒤 향후 추진전략을 도출하고자 한다.

• Architectural research
• /
• 제8권1호
• /
• pp.69-76
• /
• 2006

The purpose of this study is to suggest policies to improve the price escalation system in a construction contract through a Policy Delphi technique. The Delphi, including two times questionnaires and a group discussion, was conducted by joining 14 experts. Also, the escalation provisions of various countries were examined. Results of the Delphi showed that the minimum fluctuation rate for price escalation was desirable at a level of 3%. To compute the fluctuation rate, calculating the price fluctuation of overall articles was more desirable than using price indices. A bidding date was more reasonable as the initial date of change in price. Losses caused by price change should be shared between contractor and owner; therefore a deduction rate should be introduced in price escalation. Meanwhile, overhead and profit should be adjusted in proportion to the fluctuation rate; but advance payment or the delayed construction amount should be deducted from the adjusted amount.