• Journal of the Regional Association of Architectural Institute of Korea
• /
• v.20 no.6
• /
• pp.97-104
• /
• 2018

Recently, as the shape and function of high-rise buildings have become more complex, engineering for reflecting the constructability in the design phase has the increasing importance. However, engineering tasks are not performed at the appropriate level and timing in most projects, which leads to inefficient work such as design changes and reworks. Hence, this study investigated the constructability knowledge, design elements, and supporting tools required to conduct engineering tasks related to temporary work at the design phase, and also analyzed the relationship between these factors using the correlation analysis. As a result, when the engineering tasks are applied in the design phase, constructability knowledge related to 'construction method and process' is the most important and the design factor related to 'layout/arrangement' should be considered as the most important factor. Based on the results of this study, the project participants can efficiently use necessary constructability knowledge during the design phase and facilitate effective decision-making and design alternatives for enhancing constructability.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.16 no.2
• /
• pp.261-270
• /
• 2021

In this study, the design methodology of LCL filter for grid-connected three-phase inverter was studied. First, the advantages and disadvantages of applying typical filter structures as a filter for grid connection of a three-phase inverter were analyzed. Next, filter design methodologies for grid connection of a three-phase inverter were analyzed, and an effective filter design methodology was determined to satisfy the harmonic requirements in grid connection. In order to verify the effectiveness of the design methodology, EMTP models such as a three-phase inverter, a three-phase LCL filter, and a performance evaluation system to evaluate the performance of the designed filter were developed using EMTP-RV. Next, an LCL filter was designed for an application example of a three-phase inverter, and the waveforms of the output voltage and outage current of the three-phase inverter were checked through EMTP-RV simulation work. In particular, the validity of the design methodology was verified by confirming that the magnitude of the current ripple was reduced to a limited magnitude through waveform analysis of the output current.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.13 no.8
• /
• pp.3698-3703
• /
• 2012

The architectural design process is consisted of the phase of programming and the phase of the design. The contemporary architectural scheme, as a datascape, a rhizome structure and a diagram, is based on the concept of modern physics. And it is applied on the phase of design by synthesizing data. Like this, the design of the architectural field is accomplished in the phase of design. For design of the architectural field, the characteristics of the architectural field is considered as the viewpoint of design in the procedure. First, according to the area which is defined by relations of environments, around architectures and so on, the net system of relations is designed as area. Second, design the linkage between building and space, building and building, space and space, according to the correspondence each other. Third, design the method or form of connecting building and space to one as a building and a space are no longer divided but are understood by one. As a result, for the design of architectural field, it is necessary to define the criteria by the characteristics of architectural field and the architectural field is designed by process.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2004.11a
• /
• pp.1032-1035
• /
• 2004

Pressure distribution is measured by way microphones to identify noise sources in the space. For example, beam-forming method or acoustic holography use phase information to identify the source. Therefore, the phase is significant information to correctly identify the source position. However, due to the microphone characteristics and measuring systems, measured signals always have errors, which make the identification difficult. Therefore, phase calibration of microphones is needed. Duct and speaker systems are generally used as calibrators. Acoustic characteristics of the calibrator are, of course, functions of many Parameters of the system: i.e. duct size, frequency, and microphone spacing. In this paper, design parameters which effect on the performance and size of the calibrators are considered. Then the parameters would be applied to design and real product of the phase-calibrator.

• Proceedings of the KIEE Conference
• /
• 2003.04a
• /
• pp.88-90
• /
• 2003

SRM has a characteristic of a robust, simple structure and wide operating ranges. So, recently it has studied and developed in many kinds and forms with the technology of power electronics and analysis and design by use of computer. Also, It is used in a very wide range of industrial applications. In particular, single phase switched reluctance motor has a merit in practical use because it has simple operating drives and control systems, very high energy density per unit volume comparing with three phase SRM. But it must have a starting device. In this paper design procedures of single phase SRM development for blower drives are presented. It is selected the design parameters by compared with design theory of general electric machine and poly phase SRM. Also it is simulated the designed prototype model by FEM for the prediction of characteristics.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2016.10a
• /
• pp.745-746
• /
• 2016

The design phase is a process that is embodied to be interpreted and implemented in a requirement of the system information in the analysis phase. In the design phase, the design privacy, information security test plan is established, activities are carried out.

• Korean Journal of Construction Engineering and Management
• /
• v.9 no.4
• /
• pp.154-162
• /
• 2008

Ministry of construction and transportation has been enforcing extensionally design phase VE(Value Engineering) to the construction costing more than 10 billion won, an importance of design phase VE accordingly is raising to get rid of a waste of cost and noneffective factors previously in construction projects. Although there are legal supports and technical effects, an effect about an introduction of design phase VE can not be applied properly because of several problems at the process. So, in this study, present competency factors of design phase VE to highly raise the output through organizing an effective team at the beginning stage of design phase VE. Find out 29 competency factors through characteristics of design VE team for the check list, classify by team knowledge, team work skill, and team attitude. Get an efficiency regarding importance and find out Competency Evaluation items of design VE team, present a Competency Evaluation plan for indicating an objective standard to Competency Evaluation by measuring relative importance as to each Competency Evaluation item.

• Journal of Power Electronics
• /
• v.19 no.2
• /
• pp.344-352
• /
• 2019

To achieve high efficiency and reliability, multiphase interleaved converters with coupled inductors have been widely applied. In this paper, a coupled inductor design method for 2-phase interleaved boost converters is presented. A new area product equation is derived to select the proper core size. The wire size, number of turns and air gap length are also determined by using the proposed coupled inductor design method. Finally, the validity of the proposed coupled inductor design method is confirmed by simulation and experimental results obtained from a design example.

• Korean Journal of Computational Design and Engineering
• /
• v.18 no.5
• /
• pp.348-358
• /
• 2013

Since the safety accidents on the construction sites take large part of total industry disasters, research on the construction safety has been getting important. Recently, as BIM technology allows cooperation between designer and constructor groups, it becomes more active worldwide than before to study on the ways of accomplish construction safety improvement in the design phase. In this paper, we suggested a checklist for assuring construction safety in the phase of design, and performed automatic evaluation by using a BIM quality checking tool. This shows that it is possible for us to find out the construction safety has been improved in the design phase. Once the standard checklist and assurance process are developed, they are expected to play a great role of reducing disasters in the construction industry.

• Korean Journal of Computational Design and Engineering
• /
• v.3 no.4
• /
• pp.211-222
• /
• 1998

Parametric design is an important modeling paradigm in CAD/CAM applications, enabling efficient design modifications and variations. One of the major issues in parametric design is to develop a geometric constraint solver that can handle a large set of geometric configurations efficiently and robustly. In this appear, we propose a new approach to geometric constraint solving that employs a graph-based method to solve the ruler-and-compass constructible configurations and a numerical method to solve the ruler-and-compass non-constructible configurations, in a way that combines the advantages of both methods. The geometric constraint solving process consists of two phases: 1) planning phase and 2) execution phase. In the planning phase, a sequence of construction steps is generated by clustering the constrained geometric entities and reducing the constraint graph in sequence. in the execution phase, each construction step is evaluated to determine the geometric entities, using both approaches. By combining the advantages of the graph-based constructive approach with the universality of the numerical approach, the proposed approach can maximize the efficiency, robustness, and extensibility of geometric constraint solver.