• Smart Structures and Systems
• /
• v.19 no.4
• /
• pp.341-350
• /
• 2017

Based on the super elastic properties of the shape memory alloy (SMA) and the inverse piezoelectric effect of piezoelectric (PZT) ceramics, a kind of hybrid semi-active control device was designed and made, its mechanical properties test was done under different frequency and different voltage. The local search ability of genetic algorithm is poor, which would fall into the defect of prematurity easily. A kind of adaptive immune memory cloning algorithm(AIMCA) was proposed based on the simulation of clone selection and immune memory process. It can adjust the mutation probability and clone scale adaptively through the way of introducing memory cell and antibody incentive degrees. And performance indicator based on the modal controllable degree was taken as antigen-antibody affinity function, the optimization analysis of damper layout in a space truss structure was done. The structural seismic response was analyzed by applying the neural network prediction model and T-S fuzzy logic. Results show that SMA and PZT friction composite damper has a good energy dissipation capacity and stable performance, the bigger voltage, the better energy dissipation ability. Compared with genetic algorithm, the adaptive immune memory clone algorithm overcomes the problem of prematurity effectively. Besides, it has stronger global searching ability, better population diversity and faster convergence speed, makes the damper has a better arrangement position in structural dampers optimization leading to the better damping effect.

• Transactions of the Korean Society for Noise and Vibration Engineering
• /
• v.25 no.7
• /
• pp.487-495
• /
• 2015

A generalized special program called planetary transmission analysis(here in after PTA) is developed to improve planetary gear noise in automatic transmission. PTA is capable of analyzing any typical one-degree-of-freedom automatic transmission gear train containing any number of simple, compound or complex-compound planetary gear sets. The kinematics module in PTA can compute the rotational speeds of gears and carriers and calculate the order frequencies to predict the planetary noise components. The power flow analysis module performs a complete static force analysis providing forces, moments, or torques of gears, bearings, clutches and connections. Based on the given type and number of planetary gear sets, the search algorithm determines all possible kinematic configurations and gear tooth combinations in a required set of gear ratios, while eliminating whole kinematic redundancies and unfavorable clutching sequences. By using PTA program, planetary internal speeds of new developed automatic transmission are early obtained; therefore, possibility of the noise problem could be predicted in early design stage. As implementing PTA in planetary gear NVH development procedure, planetary gear noise was successfully reduced by 10 dBA.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.18 no.1
• /
• pp.67-73
• /
• 2000

The water quality of inland stream is polluting with industrialization and urbanization, and with that water quality of lake also deteriorated, to manage water quality pollution problem of lake, new water quality management method is needed. As a pilot study of the method that manage water quality of lake using GSIS(Geo-Spatial Information System), we study the method which automatically extract the hydraulic characteristic informations of lake in GSIS environment. Also, as an example of practical use of the extracted hydraulic characteristic information of lake, we carry out the characteristic analysis of waterbody flow using finite different method. With the automation the extraction procedure of hydraulics characteristic information needed in characteristic analysis of waterbody flow, we carried out the analysis efficiently. Particularly, with the extraction of section information on lake not in layout form, in analyzable form, we make the analysis that section information of lake was indispenably required(e.g. stratification analysis) possible in GSIS environment.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.15 no.10
• /
• pp.2209-2216
• /
• 2011

In this paper, we design a 32-bit eFuse OTP memory for PMICs using MagnaChip's $0.18{\mu}m$ process. We solve a problem of an electrical shortage between an eFuse link and the VSS of a p-substrate in programming by placing an n-well under the eFuse link. Also, we propose a WL driver circuit which activates the RWL (read word-line) or WWL (write word-line) of a dual-port eFuse OTP memory cell selectively when a decoded WERP (WL enable for read or program) signal is inputted to the eFuse OTP memory directly. Furthermore, we reduce the layout area of the control circuit by removing a delay chain in the BL precharging circuit. We'can obtain an yield of 100% at a program voltage of 5.5V on 94 manufactured sample dies when measured with memory tester equipment.

• The KIPS Transactions:PartB
• /
• v.10B no.5
• /
• pp.543-552
• /
• 2003

An increasing in quantity of multimedia data brought a new problem that expected data should be retrieved fast and exactly. The adequate representation is a key element for the efficient retrieval. For this reason, MPEG-7 standard was established for description of multimedia data in 2001. However, the content of the standard is massive and the approach method is not clear for real application system yet, because of properties of MPEG-7 standard that has to include a lot of potential cases. In this paper, we suggested implementation scheme of retrieval system with using of only visual descriptors and presented the performance results of developed system. From the result of developed system, MPEG-7 VIRS (Video/Image Retrieval System), we analyzed the retrieval results between using individual descriptor and using multiple descriptors, and showed a layout for real application system.

• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.47 no.2
• /
• pp.40-50
• /
• 2010

The studies of PMOS transistors in CMOS technologies are reviewed- focusing on the snapback and breakdown behavior of the parasitic PNP BJTs in high current regime. A new failure mechanism of PMOSFET devices under ESD conditions is also analyzed by investigating various I/O structures in a $0.13\;{\mu}m$ CMOS technology. Localized turn-on of the parasitic PNP transistor can be caused by localized charge injection from the adjacent diodes into the body of the PMOSFET, significantly degrading the ESD robustness of PMOSFETs. Based on 2-D device simulations the critical layout parameters affecting this problem are identified. Design guidelines for avoiding this new PMOSFET failure mode are also suggested.

• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.44 no.9
• /
• pp.34-39
• /
• 2007

Serial links via backplane channels suffer from severe signal integrity problems which are normally caused by channel imperfections, such as flat loss, frequency-dependent loss, reflection, etc. Particularly, the frequency-dependent loss causes ISI(Inter-Symbol-Interference) at signal waveforms. Therefore, adaptive equalizing techniques have been exploited in many products to facilitate the ISI problem. In this paper, we present an analog adaptive equalizer circuit designed in a $0.18{\mu}m$ CMOS process. It achieves 10Gb/s data transmission through a long 34-inch backplane channel(or transmission line). The post-layout simulations demonstrate $8ps_{p-p}$ jitter with 10mW power dissipation. The core of the adaptive equalizer occupies the area of $0.56mm^2$.

• Journal of the Society of Disaster Information
• /
• v.8 no.2
• /
• pp.119-137
• /
• 2012

In this study, the damages and condition of road pavement were analyzed using pavement management system (PMS) for the structural improvement. Problems of road pavement management were issued by in-depth interview with workers in charge of plant, construction and supervision. By surveying advanced road pavement management, the way how to improve road pavement management in Seoul was discussed. In conclusion, it is necessary to take measures against road heavy traffic and heavy rain in summer. It was found that the problem of early damages of road pavement due to uniform layout with analyzing life cycle cost (LCC). According to the results of survey, it was suggested to strength practical training and to control precisely the temperature of pavement in the process of production and construction.

• Journal of the Korean Institute of Landscape Architecture
• /
• v.26 no.3
• /
• pp.45-51
• /
• 1998

This research is concerned with environment problems related to Munhwa-Maul where Korean government are financially much supporting in developing housing sites and constructing houses. The purposes of this research are to find out the problems and to present the practical guidelines in order to improve an environmental quality of Munhwa-Maul in which will be under construction in the near future. The method for finding out the problems are based upon the most atisfaction and dissatisfaction of residents with opened interview. Both Mueur Munhwa-Maul and Umo Munhwa-Maul are considered for this research because Mueur Munhwa-Maul is characterized with a modern village where is located far from the city while Uo Munhwa-Maul, near the city. Also, these Munhwa-Mauls have been firstly constructed. The interview participants are 34 persons in all. They are confined to Mueur Munhwa-Maul and Umo Munhwa Maul that have been firstly constructed in Kyeongook. According to the interviews, each 60% of both Mueur Munhwa-Maul interview participants and Umo Munhwa-Maul ones have shown the their most positive satisfaction in a new housing and facility. It can be seen from that these figures that housing environment including facility of both Munhwa-Mauls is surely improved and successful. On the other hand, 43.8% of Mueur Munhwa-Maul participants and 14% of Umo Munhwa-Maul ones have particularly shown the most negative satisfaction in a size of housing lot. Also, 15.6% of Mueur Munhwa-Maul interview participant and 44% of Umo Munhwa-Maul ones have stated the most dissatisfaction in a traffic convenience. The reasons showing these differences are likely that 90% of Mueur Munhwa-Maul residents are farmer while 85% of Umo Munhwa-Maul ones are not farmer. With this results the purpose of munhwa-Maul project that government has been supporting and the reality of Umo Munhwa-Maul could be never coincident. Therefore, it can be inferred that housing layout should be reconsiderd to be appropriate for agriculture and that the government should carefully consider the contributions of new housing lot to real farmers. In addition, we can say that Munhwa-Maul project should be firstly accomplished in the district far from the city rather than near the city.

• Journal of Navigation and Port Research
• /
• v.44 no.3
• /
• pp.219-226
• /
• 2020

The container terminal operators established a re-marshalling plan to reduce the loading operation time and the release operation time. Re-marshalling is to rearrange the containers in the container yard to the advantageous position to shorten the working time using the spare time of the automated yard crane. This study assumed the automated container terminal with a perpendicular layout and deals with the inter-bay re-marshalling planning problem in a yard block. The inter-bay re-marshalling plan determines the container to be moved, the location to be relocated, and the sequence of relocation operations. This study presents a mixed integer programming model that simultaneously determines the storage location and the operation sequence while satisfying the spatial availability during the re-marshalling. Numerical experiments are conducted to understand re-marshalling operation using a beam search method.