• Title/Summary/Keyword: Swing Component

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Prosthetic reconstruction with an obturator using swing-lock attachment for a patient underwent maxillectomy: A clinical report

  • Seong, Dong-Jae;Hong, Seoung-Jin;Ha, Seung-Ryong;Hong, Young-Gi;Kim, Hyo-Won
    • The Journal of Advanced Prosthodontics
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    • v.8 no.5
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    • pp.411-416
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    • 2016
  • Patients who underwent resection of maxilla due to benign or malignant tumor, or accident will have defect in palatal area. They get retention, support and stability from remaining tissues which are hardly optimal. The advantage of swing-lock attachment design is having multiple contacts on labial and lingual side of the abutment teeth by retentive strut and palatal bracing component. Because the force is distributed equally to abutment teeth, abutment teeth of poor prognosis can be benefited from it. It is also more advantageous to cover soft tissue defects which are hard to reach with conventional prosthesis. A 56-year-old female patient who had undergone a maxillectomy due to malignant melanoma complaining of loose and unstable surgical obturator. Surveyed crowns were placed on #12, 26, and 27. Teeth #11, 21, 22, and 23 had lingual rest seat and #24 had mesial rest seat to improve stability and support of the obturator. This clinical report presents the prosthetic management of a patient treated with obturator on the maxilla using swing-lock attachment to the remaining teeth.

Design of GA-Fuzzy Controller for Position Control and Anti-Swing in Container Crane (컨테이너 크레인의 위치제어 및 흔들림 억제를 위한 GA-퍼지 제어기 설계)

  • 허동렬
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2000.05a
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    • pp.16-21
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    • 2000
  • In this paper we design a GA-fuzzy controller for position control and anti-swing at the destination point. Applied genetic algorithm is used to complement the demerit such as the difficulty of the component selection of fuzzy controller namely scaling factor membership function and control rules. lagrange equation is used to represent the motion equation of trolley and load in order to obtain mathematical modelling. Simulation results show that the proposed control technique is superior to a conventional optimal control in destination point moving and modification.

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Design of a Fuzzy Controller for Position Control and Anti-Swing in Container Crane Systems Using Genetic Algorithms (유전알고리즘을 이용한 컨테이너 크레인 시스템의 위치제어 및 흔들림 억제를 위한 퍼지 제어기 설계)

  • 정형환;허동렬;오경근;주석민;안병철
    • Journal of Advanced Marine Engineering and Technology
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    • v.24 no.6
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    • pp.53-60
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    • 2000
  • In this paper, we design a GA-fuzzy controller for position control and anti-swing at the destination point. A genetic algorithm is used to complement the demerits such as the difficulty of the component selection of the fuzzy controller, namely, scaling factors, membership functions and control rules. Lagrange equation is used to represent the motion equation of trolley and load in order to obtain mathematical modelling. Simulation results show that the proposed control technique is superior to a conventional optimal control in destination point moving and modification.

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Zeolites: Their Features as Pressure Swing Adsorbents and CO2 Adsorption Capacity (제올라이트: 압력순환형 흡착제로서의 특성과 CO2 흡착성능)

  • Kim, Moon-Hyeon;Cho, Il-Hum;Choi, Sang-Ok;Choo, Soo-Tae
    • Journal of Environmental Science International
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    • v.23 no.5
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    • pp.943-962
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    • 2014
  • Industrial gas drying, dilute gas mixtures purification, air fractionation, hydrogen production from steam reformers and petroleum refinery off-gases, etc are conducted by using adsorptive separation technology. The pressure swing adsorption (PSA) has certain advantages over the other methods, such as absorption and membrane, that are a low energy requirement and cost-effectiveness. A key component of PSA systems is adsorbents that should be highly selective to a gas being separated from its mixture streams and have isotherms suitable for the operation principle. The six standard types of isotherms have been examined in this review, and among them the best behavior in the adsorption of $CO_2$ as a function of pressure was proposed in aspects of maximizing a working capacity upon excursion between adsorption and desorption cycles. Zeolites and molecular sieves are historically typical adsorbents for such PSA applications in gas and related industries, and their physicochemical features, e.g., framework, channel structure, pore size, Si-to-Al ratio (SAR), and specific surface area, are strongly associated with the extent of $CO_2$ adsorption at given conditions and those points have been extensively described with literature data. A great body of data of $CO_2$ adsorption on the nanoporous zeolitic materials have been collected according to pressure ranges adsorbed, and these isotherms have been discussed to get an insight into a better $CO_2$ adsorbent for PSA processes.

A Study on the Out-of-Step Detection Algorithm using Frequency Deviation of the Voltage (전압의 주파수 편의를 이용한 동기탈조 검출 알고리즘에 관한 연구)

  • 소광훈;허정용;김철환
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.3
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    • pp.175-181
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    • 2004
  • The protection against transient instability and consequent out-of-step condition is a major concern for the utility industry. Unstable system may cause serious damage to system elements such as generators and transmission lines. Therefore, out-of-step detection is essential to operate a system safely. The detection of out-of-step is generally based upon the rate of movement of the apparent impedance. However such relay monitors only the apparent impedance which may not be sufficient to correctly detect all forms of out-of-step and cannot cope with out-of-step for a more complex type of instability such as very fast power swing. This paper presents the out-of-step detection algorithm using voltage frequency deviation. The digital filters based on discrete Fourier transforms (DFT) to calculate the frequency of a sinusoid voltage are used, and the generator angle is estimated using the deviation of the calculated frequency component of the voltage. The proposed out-of-step algorithm is based on the assessment of a transient stability using equal area criterion. The proposed out-of-step algorithm is verified and tested by using EMTP MODELS.

A component-based construction process control system for increasing modifiability (변경 용이성 증대를 위한 컴포넌트 기반의 건설공정관리시스템)

  • Kim, Eui-Ryong;Kim, Sin-Ryeong;Kim, Young-Gon
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.15 no.6
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    • pp.303-309
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    • 2015
  • The construction process and safety management are an important means of the total projects for the decision-making. As an important management tool of cost, resources and risks of the project, the analysis and evaluations are recorded as an important asset of company. Also, it has become a safety device that could reduce risk factors repeatedly by the decision-making methods for the future similar projects. Component-based software, by reusing the useful part, which was prepared without newly developing all that, by building a new software product, the long-term continuous/steady through the provision of a component-based software, by securing a sales base, it should be the development and supply a wide range of applications. In this paper, we propose the construction process control systems for increasing modifiability of process creation and modification for business efficiency in accordance with the diverse trends in the construction process as a low-cost niche through a component-based software supplier to solve these problems.

Operating Optimization and Economic Evaluation of Multicomponent Gas Separation Process using Pressure Swing Adsorption and Membrane Process (압력 순환 흡착과 막 분리공정을 이용한 다성분 기체의 분리공정 조업 최적화 및 경제성 평가)

  • Kim, Hansol;Lee, Jaewook;Lee, Soobin;Han, Jeehoon;Lee, In-Beum
    • Korean Chemical Engineering Research
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    • v.53 no.1
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    • pp.31-38
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    • 2015
  • At present, carbon dioxide ($CO_2$) emission, which causes global warming, is a major issue all over the world. To reduce $CO_2$ emission directly, commercial deployment of $CO_2$ separation processes has been attempted in industrial plants, such as power plant, oil refinery and steelmaking plant. Besides, several studies have been done on indirect reduction of $CO_2$ emission from recycle of reducing gas (carbon monoxide or hydrogen containing gas) in the plants. Unlike many competing gas separation technologies, pressure swing adsorption (PSA) and membrane filtration are commercially used together or individually to separate a single component from the gas mixture. However, there are few studies on operation of sequential separation process of multi-component gas which has more than two target gas products. In this paper, process simulation model is first developed for two available configurations: $CO_2$ PSA-CO PSA-$H_2$ PSA and $CO_2$ PSA-CO PSA-$H_2$ membrane. Operation optimization and economic evaluation of the processes are also performed. As a result, feed gas contains about 14% of $H_2$ should be used as fuel than separating $H_2$, and $CO_2$ separation should be separated earlier than CO separation when feed gas contains about 30% of $CO_2$ and CO. The simulation results can help us to find an optimal process configuration and operation condition for separation of multicomponent gas with $CO_2$, CO, $H_2$ and other gases.

Separation of $CH_4/CO_2/N_2$ Mixture by Pressure Swing Adsorption (PSA법을 이용하여 $CH_4/CO_2/N_2$ 혼합가스 중에서 메탄의 분리)

  • Cho, Woo-Ram;Jeong, Gu-Hyun;Shin, Young-Hwan;Yoo, Hee-Chan;Na, Byung-Ki
    • Clean Technology
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    • v.17 no.4
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    • pp.389-394
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    • 2011
  • A compact adsorption-based process for removal of carbon dioxide and nitrogen from natural gas has been discussed. Among the adsorption-based processes, especially, the pressure swing adsorption (PSA) process has been a suitable unit operation for the purification and separation of gas because of low operation energy and cost. A step cycle is made up of pressurization, feed, equalization, blowdown and rinse. In this work, the PSA process is composed of zeolite 13X and carbon molecular sieve (CMS) for removal of carbon dioxide and nitrogen from mixed gas containing $CH_4/CO_2/N_2$ (75:21:4 vol%). A CMS selectively removes carbon dioxide and a zeolite 13X separates nitrogen from methane. CMS is investigated experimentally due to the high throughput of the faster diffusing component ($CO_2$). The gas composition of top, bottom and feed tank was measured with the gas chromatography (GC) using TCD detector, helium as carrier gas and packed column for analysis of methane, carbon dioxide, and nitrogen.

A Study on the stabilization of Crane system using GA-fuzzy controller (GA-퍼지 제어기를 이용한 크레인의 안정화에 관한 연구)

  • Oh, K.G.;Hur, D.R.;Joo, S.M.;Chung, H.H.
    • Proceedings of the KIEE Conference
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    • 2000.07d
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    • pp.2473-2475
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    • 2000
  • In this paper, we design a GA-fuzzy controller for position control and anti-swing at the destination point. Applied genetic algorithm is used to complement the demerit such as the difficulty of the component selection of fuzzy controller, namely, scaling factor, membership function and control rules. Lagrange equation is used to represent the motion equation of trolley and load in order to obtain mathematical modelling.

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Preparation of NaX Zeolite Coated Honeycomb Adsorbents and It's Carbon Dioxide Adsorption Characteristics (NaX 제올라이트가 담지된 허니컴 흡착제의 제조 및 이의 이산화탄소 흡착특성)

  • Yoo, Yoon-Jong;Kim, Hong-Soo;Singh, Ranjeet;Xiao, Penny;Webley, Paul A.;Chaffee, Alan L.
    • Applied Chemistry for Engineering
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    • v.20 no.6
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    • pp.663-669
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    • 2009
  • The honeycomb adsorbent was prepared for adsorbing and seadsorbent was prepared by using zeolite sheet, which contained zeolite as component. The steady-state adsorption properties and surface morphologies were analyzed and breakthrough characteristics were ananlyzed by providing 16% carbon dioxide mixed gas. By thermal regeneration, carbon dioxide concentration properties were analyzed, and the adsorptive separation process was compared between thermal swing adsorption and pressure swing adsorption after adsorbent temperature change during heating. The breakthrough results of the honeycomb showed possibility parating carbon dioxide from combustion exhaust gas, which had deep impact on climate change, and the characteristics of the adsorbent were studied. Na-X zeolite was coated on a honeycomb prepared with ceramic sheet or active carbon sheet so that the two honycomb can be used at high temperature. Third honeycomb of rotary adsorptive concentration process.