• Steel and Composite Structures
• /
• v.35 no.4
• /
• pp.599-609
• /
• 2020

The tension-only braced frames (TOBFs) are widely used as a lateral force resisting system (LFRS) in low-rise steel buildings due to their simplicity and economic advantage. However, the system has poor seismic energy dissipation capacity and pinched hysteresis behavior caused by early buckling of slender bracing members. The main concern in utilizing the TOBF system is the determination of appropriate performance factors for seismic design. A formalized approach to quantify the seismic performance factor (SPF) based on determining an acceptable margin of safety against collapse is introduced by FEMA P695. The methodology is applied in this paper to assess the SPFs of the TOBF systems. For this purpose, a trial value of the R factor was first employed to design and model a set of TOBF archetype structures. Afterwards, the level of safety against collapse provided by the assumed R factor was investigated by using the non-linear analysis procedure of FEMA P695 comprising incremental dynamic analysis (IDA) under a set of prescribed ground motions. It was found that the R factor of 3.0 is appropriate for safe design of TOBFs. Also, the system overstrength factor (Ω₀) was estimated as 2.0 by performing non-linear static analyses.

• Journal of Digital Contents Society
• /
• v.6 no.2
• /
• pp.107-112
• /
• 2005

We need a research for representing and processing of multimedia data in database because of increasing the importance and utilization of the data owing to development of internet technology. RDBMS supports only the storing-structure to store multimedia, but the support for data type, representation and query of multimedia is insufficient. To cope with this problem, ISO/IEC standardized SQL multimedia(SQL/MM) for multimedia data. However, ORDBMS supports SQL/MM, but RDBMS does not support it. Therfore, this theis proposes a query interpreter to support SQL/MM in MS-SQL 2000 as one of RDBMS and introduces a image retrieval application using it. The quary interpreter supports the function to convert SQL/MM into SQL, and additionally the function of the image duplication check. The image processing application using a query interpreter can easily be integrated and operated with traditional RDBMS-based system.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.22 no.6
• /
• pp.641-647
• /
• 2011

This paper describes a design and fabrication of SDLVA. The SDLVA operates 0.5~2.0 GHz with -70~0 dBm dynamic range. The SDLVA is consisted of 5-stage RF block, 2-stage detector block and summation circuit using clamping op-amp to improve video linearity. The result of measure, SDLVA of RF path has over 73 dB small-signal gain and 10.1~12.2 dBm saturation power. The video path has 25 mV/ dB${\pm}$1.0 mV and under ${\pm}$1.5 dB video linearity.

• Korean Journal of Environmental Agriculture
• /
• v.26 no.2
• /
• pp.171-178
• /
• 2007

Diffusion and accumulation of ethoprophos in fruit such as apple and two types of pears were examined by dipping them into the solution of ethoprophos. The effective diffusivities of ethoprophos at the skin and flesh of apple and pear were determined by simulation their experimental accumulation curves with calculated ones from the model assuming consecutive diffusion of ethoprophos from skin to flesh. Its effective diffusivity at the flesh with higher content of water were higher, $\sim10^{-10}\;m^2/s$, regardless of the types of fruits, while that at the skin was small, $\sim10^{-12}\;m^2/s$ and increased with the order of 'Niitaka' pear < 'Whangkeumbae' pear < 'Fuji' apple. The variation in the concentration of ethoprophos in its solution did not induce any change in affecting its effective diffusivity at the flesh of 'Whangkeumbae' pear, but the increase in the concentration caused the increase in its effective diffusivity at the skin. The penetration rate of ethoprophos at the skin was an important factor in determining its accumulation rate in fruit.

• Journal of the Korean Society of Propulsion Engineers
• /
• v.10 no.1
• /
• pp.64-71
• /
• 2006

For SUAV is required to have the capacity of VTOL and fast forward flight, the SUAV development program has decided to adopt the tiltrotor mechanism which includes helicopter and turboprop mechanisms. From the engine point of view, the key engine parameters such as engine operating mechanism, engine control scheme, the dynamics characteristic of power train, engine intake/exhaust concept, and engine installation requirements should fulfill the requirements of the two different mechanisms, helicopter and turboprop. And for the maximum efficiency of the rotor, rotational speed for the two modes are 20% different, the power train shall find a way to make it so. Meeting these specific requirements for the tiltrotor mechanism, this research begins with a conventional OTS(off-the-shelf) turboshaft engine survey and minimizes engine modification to develop an economical propulsion system. The engine technical review has been performed on the basis of those requirements and capabilities.

• Geophysics and Geophysical Exploration
• /
• v.16 no.1
• /
• pp.45-52
• /
• 2013

We developed a Impulse Response Measurement System, including hardware system and data analysis software, for non-destructive test of slab structure. And, we carried out impulse response measurements on the pavement to test performance of the system. In the field test, the developed system measured impulse response stably and showed parameters immediately. Test results showed that dynamic stiffness and average mobility varies significantly depending on the characteristics of the pavement materials. Some data showed anomalous values those reflect variations in pavement itself or subsurface ground. Developed system gives informations of conditions of slab structure easily and quickly. So, 2-D monitoring with the system will be helpful in maintaining various slab structures.

• Archives of Pharmacal Research
• /
• v.18 no.5
• /
• pp.325-331
• /
• 1995

The objective of this study was to find a rational dosage form for vaginal mucosal delivery of LHRH. Vaginal absorption of LHRH was estimated by measuring its ovulation inducting effect in rat and in vitro vaginal membrane permeation study in rabbit. THe effects of different hydrogel bases, such as Polycarbophil and Pemulen compared with solutions on vaginal membrane permeation of LHRH were investigated. Sodium laurate, disodium ethylenediamine brane permeaiton of LHRH were investigated. Sodium ethylenediamine tetraacetate (EDTA) and sodium tauro-24, 25-dihydrofusidate (STDHF), which are effective peptidase inhibitors were chosen as additives to a LHRH hydrogel delivery system and LHRH solutions. A Polycarbophil compared with a solution formulation 3.4 times increase in LHRH vaginal membrane permeability compared with a solution formulation. Vaginal membrane permeability from the Polycarbophil was greater than that from Pemulen hydrogels. This may be due to the larger bioadhesive values. LHRH solution with EDTA(2%), STDHF(1%) and sodlaurate(0.5%) showed 4.1 times, 4.8 times and 6.0 times of ovulation inducing activity compared with control. These results suggest that enzyme inhibition effect of EDTA, STDHF and sod, laurate may be result in substantial enhancement of vaginal absorption. By administraiton of Polycarbophil hydrogels containing LHRH the ovulation inducing activity was 3.3 times greater than the solutions. This result indicates the bioadhesive hydrogels as well as peptidase in hibition significantly improved absorption of LHRH. By coadministration with these inhibitors the ovulation inducing activity of Polycarbophi hydrogel containing LHRH was comparable with subcutaneous administration in ovulation inducing activity.

• Journal of Digital Convergence
• /
• v.13 no.3
• /
• pp.127-135
• /
• 2015

This study has become a construction company will help you establish a Management Accounting System target model to move forward. Research method was to present the basic concepts and techniques used in managing complex accounting convergence look at the whole construction industry. For the successful deployment of a construction company management accounting system Responsibility Accounting System, Target Profit, Target Cost, and requires a key technique of Performance Evaluation, which the CEO's firm determination and persistence for support, proactive communication in the field and headquarters staff, the goal organizations and institutions to support the model, the standardization is required. This study is based on case studies in the future through the Delphi Method and AHP are needed.

• Journal of Digital Convergence
• /
• v.13 no.2
• /
• pp.115-120
• /
• 2015

As the cloud services, the underlying technology of the digital convergence environment, have been widely adopted in the business, personal information protection has been recognized as one of the major issues to resolve. When cloud services are used to process the personal information, the personal information protection law speculates the establishment of a contract or service level agreement(SLA). This research presents 7 privacy indicators and 13 metrics which can be included in cloud SLA, based on the analysis of related regulation and standards and the SMART(Specific, Measurable, Action-oriented, Relevant and Timely) model. The proposed indicators are examined using the Focus Group Interview method in terms of materiality and feasibility. The results show that all the proposed indicators are meaningful and useful.

• Journal of Digital Convergence
• /
• v.14 no.1
• /
• pp.189-194
• /
• 2016

Recently, there is increasing demand for image processing technology while activated the use of equipments such as camera, camcorder and CCTV. In particular, research and development related to 3D image technology using the depth camera such as Kinect sensor has been more activated. Kinect sensor is a high-performance camera that can acquire a 3D human skeleton structure via a RGB, skeleton and depth image in real-time frame-by-frame. In this paper, we develop a system. This system captures the motion of a 3D human skeleton structure using the Kinect sensor. And this system can be stored by selecting the motion file format as trc and bvh that is used for general purposes. The system also has a function that converts TRC motion captured format file into BVH format. Finally, this paper confirms visually through the motion capture data viewer that motion data captured using the Kinect sensor is captured correctly.