• Title/Summary/Keyword: 변경 영향 분석

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Steering System Design of Commercial Vehicle for Improving Pulling Phenomenon During Braking (상용차의 제동시 쏠림 개선을 위한 조향 연결점 설계)

  • Lee, Chang Hun;Lee, Dong Wook;Lee, Yong Su;Sohn, Jeong Hyun;Kim, Kwang Suk;Yoo, Wan Suk
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.3
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    • pp.379-385
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    • 2013
  • The tires, suspension type, and steering system can all cause pulling during braking. Among these, a drag link steering system and leaf-type suspension system are significant causes of vehicle pulling. In this study, the pulling problem is analyzed using the vehicle analysis program "ADAMS/CAR." The drag link and leaf spring behavior is analyzed to find the key reason for pulling. After this, the optimization program "Visual DOC" is used with "ADAMS/CAR" to find a steering link connection point to reduce pulling. After conducting this simulation, K&C (kinematic & compliance) test simulation with a modified connection point is conducted to determine whether the vehicle performance improves. Through a full braking simulation, it is verified that the pulling distance is reduced at braking.

Debates on the Reorganization of Administration District and Use of Maps in the Early Stage of French Revolution (프랑스 혁명 초기의 행정구역 개편을 위한 논의와 지도의 활용)

  • Jung, In-Chul
    • Journal of the Korean Geographical Society
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    • v.48 no.5
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    • pp.750-767
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    • 2013
  • The purpose of this study is to consider debates the reorganization of administrative districts and to investigate the role of maps in this debate during the early stage of French Revolution. For this, firstly, we examined the argument of reformers who attempted to change the administration system of the Old Regime. We found that physiocrats proposed map use for their attempt to reform this system. Secondly, we considered the debate on the theme of the new division of the kingdom on the basis of speeches or interventions delivered to the National Assembly. Robert de Hesseln's map, itself influenced by the geometric spirit shown by the map of Cassini, played an crucial role in the utopian ideas of revolutionaries who would divide France in administrative units of equal size geometric grid. Thirdly, the deputies decided the number and boundary of department on the basis of Hennequin's map. The final cut which resulted in very tense negotiations with local leaders was irregular polygons modeled on patterns of economic relations, and elements of relief and historical tradition. Fourthly, new administrative divisions are plotted on the map of Cassini and presented to the National Assembly. And it was declared as a new administrative division of France.

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The clinical effects of Rabeprazole sodium (Pariet$\circledR$) in the treatment of Laryngopharyngeal Reflux (인후두역류질환 ( Laryngopharyngeal Reflux Disease. LPRD )에서 Rabeprazole Sodium (Pariet$\circledR$)의 임상효과)

  • 최홍식;김한수;최현승
    • Proceedings of the KOR-BRONCHOESO Conference
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    • 2002.12a
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    • pp.9-9
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    • 2002
  • 이비인후과 영역에 있어서 위산 역류에 의한 질환의 진단은 쉽지 않고 분명하지 않은 점이 많지만, 병변의 영향은 광범위하며, 실제로 역류에 의한 증상을 가지고 내원하는 환자도 증가하는 추세이다. 인후두역류질환의 치료는 크게 생활습관의 변경, 약물복용, 항역류수술로 나눌 수 있으며, 사용약제는 크게 두 부류로 나누는데, 제산제, H2 수용체 차단제, PPI(Proton Pump Inhibitor) 제제와 같은 산억제 약물군과 Prokinetic 약물군이다. Rabeprazole sodium(Pariet(R))은 PPI 제제에 해당하는 약제로 기존의 omeprazole, lansoprazole, pantoprazole과는 달리 대사 과정 중 CYP2C19에 대한 의존도가 낮아, 개체 간 차이가 적고 빠르고 일정하게 산분비 억제 효과를 나타내는 것으로 알려져 있은 약물이다. 2001년 5월부터 2002년 4월까지 32개 병원에서 Pariet(R) 를 복용한 2166명의 환자를 대상으로 분석하였다. 복용기간에 따라 4군(1군;1-14일, 2군;15-28일, 3군;29-56일, 4군:57일 이상)으로 나누었으며, 8가지 증상(Heart burn, Regurgitation, Chronic cough, Hoarseness, Globus sensation, Chronic throat clearing, Sore throat, Dysphagia)에 대한 호전 여부 및 후두내시경상 개선 정도, 의사에 의한 유용도 평가, 부작용 발생 여부에 대해 연구하였다. 증상개선율 50%이상을 치료 반응군으로 했을때 전체 2166명중 1627명(75.1%)에서 증상의 호전을 보았으며, 이는 복용기간이 길수록 증가하였다. 후두 내시경상 개선 정도는 현저한 개선이 32.9%, 중등도 개선이 38.7%로 대부분 환자에서 객관적인 병변의 호전을 보였으며, 유용도 평가에서는 매우 유용이 37.6%, 유용이 50.3%로 치료효과에 대한 만족도도 높은 것을 알수 있었다. PPI 제제의 부작용으로 보고되고 있는 두통, 오심, 설사, 복통. 변비, 어지럼증. 피곤 중. 소수의 환자가 두통을 호소하였으나, 그다지 심각한 정도는 아니었다. 인후두역류증 치료제로서 Pariet(R) 는 비교적 안전하고 효과가 높은 약물임이 임상 연구 결과 밝혀졌기에 보고하는 바이다.

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Core-loss Reduction on Permanent Magnet for IPMSM with Concentrated Winding (집중권을 시행한 영구자석 매입형 동기전동기의 철손 저감)

  • Lee, Hyung-Woo;Park, Chan-Bae;Lee, Byung-Song
    • Journal of the Korean Society for Railway
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    • v.15 no.2
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    • pp.135-140
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    • 2012
  • Interior Permanent Magnet Synchronous motors (IPMSM) with concentrated winding are superior to distributed winding in the power density point of view. But it causes huge amount of eddy current losses on the permanent magnet. This paper presents the optimal permanent magnet V-shape on the rotor of an interior permanent magnet synchronous motor to reduce the core losses and improve the performance. Each eddy current loss on permanent magnet has been investigated in detail by using FEM (Finite Element Method) instead of equivalent magnetic circuit network method in order to consider saturation and non-linear magnetic property. Simulation-based design of experiment is also applied to avoid large number of analyses according to each design parameter and consider expected interactions among parameters. Consequently, the optimal design to reduce the core loss on the permanent magnet while maintaining or improving motor performance is proposed by an optimization algorithm using regression equation derived and lastly, it is verified by FEM.

Spatial Optimization Approaches to Redistricting for National Assembly Election: A Case Study on Yongin City (공간 최적화 기법을 이용한 국회의원 선거구 획정 -용인시를 사례로-)

  • Kim, Myung Jin;Kim, Kamyoung
    • Journal of the Korean Geographical Society
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    • v.48 no.3
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    • pp.387-401
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    • 2013
  • Redistricting of National Assembly Election has a significant effect on the results of election because it has a strong tendency to be performed with political intentions rather than the equivalent representativeness of population and region. This paper focuses on proposing an alternative for restricting of National Assembly Election in terms of implementation, that is, an procedural and systematic approach, not allowing for political or arbitrary intervention. A spatial optimization model conforming with criteria for political redistricting such as population equality, contiguity, and spatial compactness is developed and applied to Yongin City where are some controversy over the redistricting of the 19th National Assembly. Modeling results show that it is possible to derive National Assembly Election districts based on the information of basic spatial units without political consideration or arbitrary intervention. In addition, The districts derived from the model improved population equality compared with the existing districts.

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Study on CO2 Decomposition using Ar/CO2 Inductively Coupled Plasma (아르곤/이산화탄소 혼합가스의 유도 결합 플라즈마를 이용한 이산화탄소 분해 연구)

  • Kim, Kyung-Hyun;Kim, Kwan-Yong;Lee, Hyo-Chang;Chung, Chin-Wook
    • KEPCO Journal on Electric Power and Energy
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    • v.1 no.1
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    • pp.135-140
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    • 2015
  • Decomposition of carbon dioxide is studied using $Ar/CO_2$ mixture inductively coupled plasmas (ICP). Argon gas was added to generate plasma which has high electron density. To measure decomposition rate of $CO_2$, optical emission actinometry is used. Changing input power, pressure and mixture ratio, the plasma parameters and the spectrum intensity were measured using single Langmuir probe and spectroscope. The source characteristic of Carbon dioxide ICP observed from the obtained plasma parameters. The decomposition rate is evolved depending on the reaction and discharge mode. This result is analyzed with both the measurement of the plasma parameters and the dissociation mechanism of $CO_2$.

A Study on the Solution of Y2K Problem (Y2k 문제 해결 방안)

  • 박민수;최수길
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 1999.11a
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    • pp.270-273
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    • 1999
  • Y2k will be able to enormous disaster. The many make an effort to find a solution to problem of Y2k. Problem of Y2k must solution to as follow. First, problem of Y2k solution organization must constructed. Second, in step with each stage-the first, developing and complete stage, stage of Y2k solution must be constructed. Third, solution of Y2k must construct to hierarchy. hierarchy structure constructed form six stage to first stage, first stage is investigation resources, second stage is estimation influence, third stage is planing conversion, fourth stage is working conversion, fifte spot, sixth stage is diffusion on the spot.

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The Wireless Communication for Marine Buoy (해상 브이용 무선 통신체계)

  • Oh, Jin-Seok;Jeon, Joong-Sung
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.9
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    • pp.2140-2146
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    • 2014
  • Ocean buoys are operated for safe navigation and collecting ocean data. Recently, to reducing marine buoy's damage by ocean weather's bad condition and collision with vessels has been conducted in several field research. This paper's experiment is buoy condition monitoring about predefined data form by users. As a result using Wireless remote control board applying a radio signal processing algorithms, it can observe buoy's state at an interval of three minutes on the land. Acquired data type is changeable according to ocean weather condition or buoy's purpose of using in advance. Also, this paper conducted an experiment such as data-transmission's stability and wireless communication's availability. As results of the analysis of the transmitted data, the solar, wind and wave power indicates the maximum amount of power, 50 W, 20 W and 40 W respectively. The communication system proven through this research can apply to buoy or other ocean facility.

An Analysis and Retrofit of U-rib Fatigue Cracks in the Steel Deck Bridge (강바닥판 교량의 U리브 피로균열 해석 및 보강)

  • Ryu, Duck-Yong;Jung, Hie-Young
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.2
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    • pp.176-183
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    • 2010
  • In the steel deck box girder bridges, the deck is composed of deck plate, longitudinal and lateral direction ribs. The bridge, that is considered in this study, has been used for about 40 years and, recently, several cracks were found in the connection area of U-ribs. Further, additional cracks were occurred after some lateral rib plates and longitudinal frames were attached for the purpose of reinforcement. Therefore, the connection method in the U-ribs reinforcement was changed from the bolting to the weldment to get rid of stress concentration and further cracking. In this study, the stress in the U-ribs connection was analysed numerically and variable amplitude stress for the real traffic loads was measured experimentally before and after the frame reinforcement. Finally, the effects of reinforcement method were investigated and discussed.

A Study on Considerations in KCR4 through Changes of Cataloging Rules from AACR2 to RDA (AACR2에서 RDA로 목록규칙 변화에 따른 KCR4의 고려사항에 관한 연구)

  • Lee, Mi-Hwa
    • Journal of the Korean Society for information Management
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    • v.28 no.1
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    • pp.23-42
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    • 2011
  • This study is to compare the descriptive cataloging rules between AACR2 and RDA, and then to find a direction of future cataloging and KCR 4. RDA is new cataloging rules that embody the International Cataloging Principles(2009), FRBR and FRAD. It is a structure of bibliographic control of all kinds of resources, and the rules can be flexibly applicable in the international cataloging community. It is critical to embody RDA in KCR 4 because RDA is likely to affect the future cataloging through its collocation function and relation function to construct semantic web of OPAC. This study analyzed the descriptive rules of work, expression, and manifestation based on RDA draft(2008) of JSC for Development of RDA. It analyzed the changes in the cataloging rules from AACR2 to RDA in such descriptive areas as title, type of resources, statement of responsibility, edition, publication, physical description and series in the manifestation level, and the preferred access points in both expression and work levels. The findings of this study will provide implications in revising KCR4.