• Journal of The Korea Institute of Healthcare Architecture
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• v.10 no.1
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• pp.29-38
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• 2004

The purpose of this study is to analyze the air ventilation system in apartment houses focused on the air circulation and pilotis. The air ventilation system is used with the data which were obtained by the environmental health, urban climate, air pollution, ventilation path. The architectural element was pilotis concept connected with piloti ratio, piloti position and piloti type. The summaries of this study were as follows; 1) the well-being apartment concept, 2) the heat island phenomenon, 3) the oxygen density of air, 4) the definition of ventilation path, 5) the pilotis connected with residential environment improvement. In addition, the detailded case study to the air ventilation system in apartment houses be needed.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.11a
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• pp.52-57
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• 2001

In this paper, the optimum designs of air-bearing surface(ABS) are achieved effectively by using reduced basis concept which can reduce the number of design variables although the design space is distended. Generally, the optimization method is more effective than the trial and error. However, the efficiency of the former is largely dependent on the number of the design variables. In order to reduce the number of design variables and increase the efficiency, reduced basis concept is applied. We can define the desired design as a linear combination of basis designs using this concept. From this optimization method with reduced basis concept, we easily obtain the optimum designs of ABS whose target flying heights are 25, 20, 15 nm.

• Korean Journal of Child Studies
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• v.25 no.4
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• pp.93-114
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• 2004

The purposes of the present study were to identify the stages of early concept development of the air in young Korean children and to compare the stages with those reported by Piaget. The subjects were 87 four, five, and six-year-old children from one kindergarten, two day care centers, and an elementary school, all located in Seoul. To collect the children's ideas of the air, individual interviews were conducted based on Piaget's Clinical Interview method. According to the results, the children formulated very unique concepts of the air, showing artificialism, anthropocentric finalism, animism, and dualism. Their concepts of the air showed a consistent developmental process which is very similar to the stages proposed by Piaget. This implies that young children's misconcepts and idosyncratic ideas are very natural and can not be eliminate easily by artificial instruction. This also means that children's internal ideas themselves should be the starting point of education.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.19 no.2
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• pp.37-44
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• 2011

This paper summarizes the HVO concept and procedures, presents a summary of the research and results, and outlines areas where future HVO is required. This concept enables people to get their destinations through shortest paths with advanced air traffic control system and equipments. The concept's key feature is that pilots maintain their own separation from other aircraft using air-to-air datalink and on-board software which are needed for supporting flight information present on the high Way in the sky display and airborne internet. By assigning Self-Controlled Area which assume pilot have separation responsibility, controllers evaluated SATS HVO concept as a successful method on the view of reduced workload and increased traffic level on high volume operation.

• Journal of Electrical Engineering and Technology
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• v.10 no.3
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• pp.1349-1355
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• 2015

It is difficult to calculate the magnetic force of an object of magnetic material in contact with other objects using the existing methods, such as Maxwell stress tensor method, magnetic charge method, or magnetizing current method. These methods are applicable for force computation only when the object is surrounded by air. The virtual air-gap concept has been proposed for calculating the contact force. However, its application is limited to magneto-static system. In this paper, we present the virtual air-gap concept for contact surface force in the eddy-current system. Its validity and usefulness are shown by comparison between numerical and experimental examples.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.45 no.1
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• pp.10-19
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• 2022

Recently, the Defense Advanced Research Projects Agency(DARPA) in the United States is studying a new concept of war called Mosaic Warfare, and MUM-T(Manned-Unmanned Teaming) through the division of missions between expensive manned and inexpensive unmanned aircraft is at the center. This study began with the aim of deriving the priority of autonomous functions according to the role of unmanned aerial vehicles in the present and present collaboration that is emerging along with the concept of mosaic warfare. The autonomous function of unmanned aerial vehicles between the presence and absence collaboration may vary in priority depending on the tactical operation of unmanned aerial vehicles, such as air-to-air, air-to-ground, and surveillance and reconnaissance. In this paper, ACE (Air Combat Evaluation), Skyborg, and Longshot, which are recently studied by DARPA, derive the priority of autonomous functions according to air-to-air collaboration, and use AHP analysis. The results of this study are meaningful in that it is possible to recognize the priorities of autonomous functions necessary for unmanned aircraft in order to develop unmanned aerial vehicles according to the priority of autonomous functions and to construct a roadmap for technology implementation. Furthermore, it is believed that the mass production and utilization of unmanned air vehicles will increase if one unmanned air vehicle platform with only essential functions necessary for air-to-air, air-to-air, and surveillance is developed and autonomous functions are expanded in the form of modules according to the tactical operation concept.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.27 no.3
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• pp.343-348
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• 2003

In this study, optimum designs of the air-bearing surface (ABS) are achieved using the reduced basis concept which can effectively reduce the number of design variables without cutting down on the design space. Even though the optimization method is easier and more applicable to handle than the trial-and-error method, its efficiency is largely dependent on the number of the design variables. Hence, the reduced basis concept is applied, by which the desired design can be defined as a linear combination of basis designs. The simulation results show the effectiveness of the proposed approach by obtaining the optimum solutions of the sliders whose target flying heights are 25, 20, and 15nm.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.30 no.4
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• pp.1-8
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• 2022

In this study, we propose trajectory-based arrival management using CDO (Continuos Descent Operations). The operational procedures with TBO (Trajectory-Based Operations) concept were established to allow aircraft and ground system to share the trajectories with each other in real time. The proposed operational concept was validated in the air traffic control simulation environment, which consists of controller working position, pseudo pilot system, air traffic generation system, and controllers' decision support system for arrival management using CDO. Simulation results compared with actual flight data indicate that proposed concept could improve the efficiency of traffic flow management in terms of total descending time and fuel consumption. And it was confirmed that if there is a system that can share and utilize the synchronized trajectory, it can be helpful to control arrival aircraft and apply CDO concept.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.35 no.12
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• pp.41-48
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• 2006

For the Designing a Dedicated Outdoor Air System with Ceiling Radiant Cooling Panels the concept of a dedicated outdoor air system(DOAS) with parallel sensible cooling was born from the decoupled system concept, which can be summarized as decoupling of ventilation and air-conditioning functions, or decoupling of sensible and latent load functions. First , remove the latent loads from the outside air(OA) intake and generated in spaces using a 100% OA ventilation system(i.e., DOAS). Second, remove the space sensible loads using a parallel mechanical cooling system, such as fan coil units, conventional variable air volume , and ceiling radiant cooling panel(CRCP) independent of the ventilation system.

• The Korean Journal of Air & Space Law and Policy
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• v.4
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• pp.37-49
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• 1992

In the changing glabal order, international aviation order is also challenged. Regionalism including EC integration press us to review and renew traditional international aviation legal order. Under such a significant circumstances, this paper examines the legal concept of freedoms of air and air cobotage and problems of their expanded applications. The papar particularly analyzes various concepts of cabotage and arguments in the interpretations of article 7 (cabotoge) of Chicago Convention and presents alternatives of future direction to accommodate problems which world aviation community faces today.