• Title, Summary, Keyword: Phase wrapping

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Software Designing Simulator for Controlling Multiple-Mechanism Carrier System

  • Nakamura, Kotaro;Kumagai, Koji;Sato, Seiji;Sato, Shoichi
    • 제어로봇시스템학회:학술대회논문집
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    • pp.450-450
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    • 2000
  • This paper presents a software design simulation method for controlling multiple mechanism carrier system (MMCS), which is mainly used in a wrapping machine or a case packing machine. This method uses a mechanical tool-work interactive model proposed in this paper, in order to represent the interactive behaviors between some tools and a work driven by their tools, in which low effect states of a work are defined. Based on this method, a 3-D simulation system has been built. It consists of shape modeling of each device, behavior definitions of tools, and control logic using if-then expression. By applying it to a ase packing machine having about 30 mechanical devices and 100 inputs/outputs for control, the effectiveness of this method has been shown in general verification of control logic specification in an early software design phase and the possibility of smooth communication tool between mechanical and software designers.

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$TiO_2$ Nanotubes Preparation and Its Formation Mechanism

  • Kang, Young-Gu;Shin, Ki-Seok;Ahn, Sung-Hwan;Hahm, Hyun-Sik
    • Journal of the Korean Applied Science and Technology
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    • v.27 no.4
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    • pp.487-493
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    • 2010
  • There has been a controversy on the formation mechanism of $TiO_2$ nanotubes. This study was conducted to elucidate the formation mechanism of $TiO_2$ nanotubes. $TiO_2$ nanotubes were prepared by a hydrothermal method. $TiO_2$ nanotubes formation mechanism was investigated by controlling the formation time. It was found that $TiO_2$ nanotubes were formed by growing, not by wrapping of sheets. The phase structure of hydrogen titanate nanotubes was different from that of $TiO_2$ nanotubes. It is important to wash the sodium titanate nanotubes with an acidic solution to get hydrogen titanate nanotubes and then to calcine the hydrogen titanate nanotubes around $400^{\circ}C$ to obtain $TiO_2$ nanotubes.

Magnetic Shielding with Thin Magnetic Materials near Power Cables (박판 자성 재료를 이용한 전력 케이블 인근의 자기장 차폐)

  • Kim, Sang-Beom;Soh, Joon-Young;Shin, Koo-Yong;Jeong, Jin-Hye;Myung, Sung-Ho
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.7
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    • pp.639-647
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    • 2009
  • In this work, wrapping conductors with thin magnetic materials is proposed as a magnetic shielding method. The 0.1 mm thick metal sheets of mu-metal, grain-oriented electrical steel, and non-oriented electrical steel were produced from commercial alloy sheets through cold rolling and followed high temperature annealing. In case of 3-phase electric currents, mu-metal was the best in shielding performance at a B-field magnitude of about 100 ${\mu}T$, whereas silicon steels were better than mu-metal at a B-magnitude over 500 ${\mu}T$. In addition, wrapping with silicon steel(inner) together with mu-metal(outer) resulted in a shielding factor less than 0.1 even at 500 ${\mu}T$. These results are due to changes in hierarchy of magnetic permeabilities of the materials with increasing magnetic field strength. In case of single-phase electric current, B-magnitude outside the magnetic shell was rather increased compared to the unshielded case. This result is explained by vector composition of B-fields near magnetic shielding materials.

The 1970's Fashion Trend at Vogue Magazine: If you can't wrap it, tie it, sling it, fling it

  • Ahn, Insook
    • Journal of Fashion Business
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    • v.17 no.6
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    • pp.76-87
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    • 2013
  • The purpose of this study is to understand how the silhouette changed throughout 1970s and assess how US women express their identities through their dress, which may explain societies' attitudes through the way women dresses. US Vogue fashion magazines were used to explore all the information on fashion and style trends, social trends, beauty, and travel. A content analysis was performed on the issues of the March and September for the years 1970 to 1979. The findings for this study about the 1970s were all about perpetual change, constantly moving forward with innovation. The color ranged from bright, cheery and bold to deep and passionate to subtle neutrals. There were a few constant colors through the decade like white, black and navy. Occasionally the trend would completely change from one season to the next within the same year. They would be full and oversized and then be slim and body conscious. The one trend that stayed true for the entire decade was wrapping. Skirts, pants, dresses, tops, shoes and jewelry; everything wrapped in one-way or another. Clothes steadily became more revealing as the years progressed. Fabrics over all were soft and knitted. Casual and comfortable was the phase heard most often. In the 1970s there was constant change in prints. They were bold and large or subtle and small, ethnic or floral. Hair was mostly smooth and sleek however towards the style moved to a fuller look.

Estimation of Instantaneous Sea Level Using SAR Interferometry

  • Kim, Sang-Wan;Won, Joong-Sun
    • Korean Journal of Remote Sensing
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    • v.18 no.5
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    • pp.255-261
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    • 2002
  • Strong and coherent radar backscattering signals are observed over oyster sea farms that consist of artificial structures installed on the bottom. We successfully obtained 21 coherent interferograms from 11 JERS-1 SAR data sets even though orbital baselines (up to 2 km) or temporal baselines (up to 1 year) were relatively large. The coherent phases preserved in the sea farms are probably formed by double bouncing from sea surface and the sea farming structures, and consequently they are correlated with tide height (or instantaneous sea level). Phase unwrapping is required to restore the absolute sea level. We show that radar backscattering intensity is roughly correlated with the sea surface height, and utilize the fact to determine the wrapping counts. While the SAR image intensity gives a rough range of absolute sea level, the interferometric phases provide the detailed relative height variations within a limit of $2{\pi}$ (or 15.3 cm) with respect to the sea level at the moment of the master data acquisition. A combined estimation results in an instantaneous sea level. The radar measurements were verified using tide gauge records, and the results yielded a correlation coefficient of 0.96 with an r.m.s. error of 6.0 cm. The results demonstrate that radar interferometry is a promising approach to sea level measurement in the near coastal regions.

Preliminary Study on the MR Temperature Mapping using Center Array-Sequencing Phase Unwrapping Algorithm (Center Array-Sequencing 위상펼침 기법의 MR 온도영상 적용에 관한 기초연구)

  • Tan, Kee Chin;Kim, Tae-Hyung;Chun, Song-I;Han, Yong-Hee;Choi, Ki-Seung;Lee, Kwang-Sig;Jun, Jae-Ryang;Eun, Choong-Ki;Mun, Chi-Woong
    • Investigative Magnetic Resonance Imaging
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    • v.12 no.2
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    • pp.131-141
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    • 2008
  • Purpose : To investigate the feasibility and accuracy of Proton Resonance Frequency (PRF) shift based magnetic resonance (MR) temperature mapping utilizing the self-developed center array-sequencing phase unwrapping (PU) method for non-invasive temperature monitoring. Materials and Methods : The computer simulation was done on the PU algorithm for performance evaluation before further application to MR thermometry. The MR experiments were conducted in two approaches namely PU experiment, and temperature mapping experiment based on the PU technique with all the image postprocessing implemented in MATLAB. A 1.5T MR scanner employing a knee coil with $T2^*$ GRE (Gradient Recalled Echo) pulse sequence were used throughout the experiments. Various subjects such as water phantom, orange, and agarose gel phantom were used for the assessment of the self-developed PU algorithm. The MR temperature mapping experiment was initially attempted on the agarose gel phantom only with the application of a custom-made thermoregulating water pump as the heating source. Heat was generated to the phantom via hot water circulation whilst temperature variation was observed with T-type thermocouple. The PU program was implemented on the reconstructed wrapped phase images prior to map the temperature distribution of subjects. As the temperature change is directly proportional to the phase difference map, the absolute temperature could be estimated from the summation of the computed temperature difference with the measured ambient temperature of subjects. Results : The PU technique successfully recovered and removed the phase wrapping artifacts on MR phase images with various subjects by producing a smooth and continuous phase map thus producing a more reliable temperature map. Conclusion : This work presented a rapid, and robust self-developed center array-sequencing PU algorithm feasible for the application of MR temperature mapping according to the PRF phase shift property.

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A Design Technique of Meta-Model for Reengineering from Legacy to CBD (레거시로부터 CBD로의 재공학을 위한 메타 모델 설계 기법)

  • Kim Chul-Jin;Cho Eun-Sook
    • Journal of Korea Multimedia Society
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    • v.8 no.3
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    • pp.398-412
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    • 2005
  • There is an increasing interest in migration legacy systems to new hardware platforms and to new software development paradigms. The reason is that high maintenance costs and lack of documentation. In order to migrate or transform legacy system, various approaches such as screen scrapping, wrapping, semi-development, and re-development, tools, and methodologies are introduced until now. However, architecture or requirements level's transformation is not suggested because most of those approaches focus on code-level transformation or a few model-level transform. In this paper, we suggest a meta-model driven approach applying 3D space concept, which can be applied into architecture and requirement phase. Proposed integrated model drives seamless migration or co-evolution from code to architecture of reverse engineering and from architecture to code of forward engineering.

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A Study on the Optimum Generation Condition of Ultrasonic Guided Waves for Insulation Pipelines (단열된 배관의 유도초음파 최적 발생조건 선정에 관한 연구)

  • Lee, Dong-Hoon;Cho, Hyun-Joon;Kang, To;Park, Dong-Jun;Kim, Byung-Duk;Huh, Yun-Sil;Lee, Yeon-Jae
    • Journal of the Korean Institute of Gas
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    • v.20 no.6
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    • pp.50-57
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    • 2016
  • Pipeline is one of the most abundant components in petrochemical plant. It plays a critical role in transporting fluids. Some pipelines are thermally insulated by wrapping them with insulating materials to prevent the loss of energy. However, when corrosion begins under insulation, it cannot be easily seen without unwrapping the cover, and thus corrossion should be detected using a non-destructive ways such as ultrasound guided wave. In this paper, the piping where the CUI (Corrosion Under Insulation) which occurs in the insulation parts guided waves effectively the optimum condition which is theoretical for selected guided waves phase velocity dispersion curve and wave-structure. The results of this study are expected to be directly utilized for onsite inspection of pipeline's CUI in many petrochemical plants.