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Thalamo-cortical system involving higher-order nuclei in patients with first-episode psychosis

  • Cho, Kang Ik K.;Kwak, Yoo Bin;Hwang, Wu Jeong;Lee, Junhee;Kim, Minah;Lee, Tae Young;Kwon, Jun Soo
    • BMB Reports
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    • v.51 no.9
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    • pp.427-428
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    • 2018
  • Based on the piling reports of disruptions in the thalamus of patients with schizophrenia, the alteration in the thalamo-cortical system has been regarded as the core pathophysiology. As the thalamus is composed of distinctive nuclei with different cytoarchitecture and cortical connections, nuclei specific investigations have been actively conducted in post-mortem studies. In addition, the importance of early changes has been highlighted, which in turn has led to investigations of the thalamo-cortical system using non-invasive neuroimaging methods. From this perspective, the early structural changes in the thalamo-cortical system, such as the thalamo-cortical connection and nuclei specific microstructural changes (which are coherent with findings from post-mortem methods) will be briefly discussed. The main findings, which are the reduced thalamo-prefrontal connection and reduced microstructural complexity in the higher-order nuclei detected in first-episode psychosis patients, suggest the occurrence of early alterations within and between the communication hub of the brain and cortex. These findings suggest not only directions for further studies for unveiling the thalamo-cortical system related pathophysiology, but also the possibility of using the reduced microstructural complexity in the higher order nucleus as a biomarker for schizophrenia.

Rotordynamic Analysis and Experimental Investigation of the Turbine-Generator System Connected with Magnetic Coupling (마그네틱 커플링으로 연결된 터빈-발전기 시스템의 로터다이나믹 해석 및 실험적 고찰)

  • Kim, Byung Ok;Park, Moo Ryong;Choi, Bum Seok
    • The KSFM Journal of Fluid Machinery
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    • v.16 no.3
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    • pp.32-38
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    • 2013
  • This paper deals with the study on the rotordynamic and experimental analysis of turbine-generator system connected with a magnetic coupling. Although magnetic coupling has been used to torque transmission of chemical processing pump rotating at under 3,600rpm, magnetic coupling in this study is applied to high-speed turbine-generator system using a working fluid that is refrigerant such as ammonia or R-124a. Results of rotordynamic design analysis are as follows. The first, shaft diameter nearest to outer hub of magnetic coupling has a big effect on the $1^{st}$ critical speed of generator rotor. The second, if the $1^{st}$ critical speeds of turbine rotor and generator rotor have enough to separation margin in comparison to rated speed, the $1^{st}$ critical speed of turbine-magnetic coupling-generator rotor train has enough to separation margin regardless of connection stiffness of magnetic coupling. The analytical FE model is guaranteed by impact test on the prototype and condition monitoring such as measurements of vibration and bearing temperature is also performed.

A Study on the Policy Improvement of Youth Facilities in Seoul, South Korea (서울시 청년시설의 정책적 개선방향 연구)

  • Yoo, Hae-Yeon;Park, Yeon-Jeong
    • Journal of the Architectural Institute of Korea Planning & Design
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    • v.35 no.5
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    • pp.31-40
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    • 2019
  • The purpose of this study is to propose policy implications of youth facilities that will be expanded by analysing at the current status of youth facilities in Seoul. The study was conducted as a process of improvement directions through prior researches and analysis of policy, survey of cases and analysis of status. First, the appearance background and status of youth facilities were analyzed for the study. It also looked at research institutes and Seoul Metro Government's policies and systems. Second, the space composition of 10 youth facilities operated by the Seoul Metropolitan Government was analyzed according to local characteristics, programs and policies. Third, based on this, the policy implications of youth facilities were derived. As a result of the study, the following results were derived : First, the need to link youth facilities with policies to "live" solutions, secondly, DB of information and connection to youth facilities and jobs and thirdly, connection with major public institutions and facilities to promote active use, and finally, development of space provision and support systems and programs considering characteristics of local governments.

Implementation of PC based Motor Fault Diagnosis System (PC 기반 전동기 고장 진단 시스템의 구현)

  • Doo, Seung-Ho;Park, Jin-Bae;Kwak, Ki-Seok
    • Proceedings of the KIEE Conference
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    • pp.2195-2196
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    • 2006
  • This study is for implementation of PC based Motor fault diagnosis system. By using harmonics and current signals of the motor, this system diagnoses the motor condition by accumulated harmonic contribution rate. In this proposed system that was composed of 5 parts. A sensor, connection box, evaluation board, device server, and main computer are those. There were two types of sensor, one was harmonic sensor the other was current sensors. The signal was acquired by sensor, and transferred to evaluation board. Second one is connection box. Because the output type of sensor and input type of evaluation board is different, connection box was necessary. Third one was evaluation board. The signal from the sensor was converted to digital signal in evaluation board. And this signal was transferred to device server. Fourth one was device server. Device server transferred the data from evaluation board to main computer. And the last one was other parts controlled by main computer. In main computer, there were communication and diagnosis algorithms. The result was derived by main computer. In the result, there were 12 categories and 5 levels of motor conditions. The proposed system had some advantages comparing with stand alone type commercial motor fault diagnosis system. The first, by using remote access it was easier to get the conditions of motor. The second, there was no need to handle the sensors when users measured the motor signals. By this property, no one was necessary at motor location site. The third, this system was less restricted by times and places than commercial stand alone type diagnosis system. Therefore users can operate this system only using the main computer. Once the sensors are installed at the motor, users doesn't need to move to check up the condition of motors. Moreover, if there is ethernet hub, many motors can be not only diagnosed at once but also decreased its cost.

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Implementation of PC based Motor Fault Diagnosis System (PC 기반 전동기 고장 진단 시스템의 구현)

  • Doo, Seung-Ho;Park, Jin-Bae;Kwak, Ki-Seok
    • Proceedings of the KIEE Conference
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    • pp.563-564
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    • 2006
  • This study is for implementation of PC based Motor fault diagnosis system. By using harmonics and current signals of the motor, this system diagnoses the motor condition by accumulated harmonic contribution rate. In this proposed system that was composed of 5 parts. A sensor, connection box, evaluation board, device server, and main computer are those. There were two types of sensor, one was harmonic sensor the other was current sensors. The signal was acquired by sensor, and transferred to evaluation board. Second one is connection box. Because the output type of sensor and input type of evaluation board is different, connection box was necessary. Third one was evaluation board. The signal from the sensor was converted to digital signal in evaluation board. And this signal was transferred to device server Fourth one was device solver. Device server transferred the data from evaluation board to main computer. And the last one was other parts controlled by main computer. In main computer, there were communication and diagnosis algorithms. The result was derived by main computer. In the result, there were 12 categories and 5 levels of motor conditions. The proposed system had some advantages comparing with stand alone type commercial motor fault diagnosis system. The first, by using remote access it was easier to get the conditions of motor. The second, there was no need to handle the sensors when users measured the motor signals. By this Property, no one was necessary at motor location site. The third, this system was less restricted by times and places than commercial stand alone type diagnosis system. Therefore users can operate this system only using the main computer. Once the sensors are installed at the motor, users doesn't need to move to check up the condition of motors. Moreover, if there is ethernet hub, many motors can be not only diagnosed at once but also decreased its cost.

  • PDF

Implementation of PC based Motor Fault Diagnosis System (PC 기반 전동기 고장 진단 시스템의 구현)

  • Doo, Seung-Ho;Park, Jin-Bae;Kwak, Ki-Seok
    • Proceedings of the KIEE Conference
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    • pp.1689-1690
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    • 2006
  • This study is for implementation of PC based Motor fault diagnosis system. By using harmonics and current signals of the motor, this system diagnoses the motor condition by accumulated harmonic contribution rate. In this proposed system that was composed of 5 parts. A sensor, connection box, evaluation board, device server, and main computer are those. There were two types of sensor, one was harmonic sensor the other was current sensors. The signal was acquired by sensor, and transferred to evaluation board. Second one is connection box. Because the output type of sensor and input type of evaluation board is different, connection box was necessary. Third one was evaluation board. The signal from the sensor was converted to digital signal in evaluation board. And this signal was transferred to device server. Fourth one was device server Device server transferred the data from evaluation board to main computer. And the last one was other parts controlled by main computer. In main computer, there were communication and diagnosis algorithms. The result was derived by main computer. In the result, there were 12 categories and 5 levels of motor conditions. The proposed system had some advantages comparing with stand alone type commercial motor fault diagnosis system. The first, by using remote access it was easier to get the conditions of motor. The second, there was no need to handle the sensors when users measured the motor signals. By this property, no one was necessary at motor location site. The third, this system was less restricted by times and places than commercial stand alone type diagnosis system. Therefore users can operate this system only using the main computer. Once the sensors are installed at the motor, users doesn't need to move to check up the condition of motors. Moreover, if there is ethernet hub, many motors can be not only diagnosed at once but also decreased its cost.

  • PDF

Implementation of PC based Motor Fault Diagnosis System (PC 기반 전동기 고장 진단 시스템의 구현)

  • Doo, Seung-Ho;Park, Jin-Bae;Kwak, Ki-Seok
    • Proceedings of the KIEE Conference
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    • pp.1229-1230
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    • 2006
  • This study is for implementation of PC based Motor fault diagnosis system. By using harmonics and current signals of the motor, this system diagnoses the motor condition by accumulated harmonic contribution rate. In this proposed system that was composed of 5 parts. A sensor, connection box, evaluation board, device server, and main computer are those. There were two types of sensor, one was harmonic sensor the other was current sensors. The signal was acquired by sensor, and transferred to evaluation board. Second one is connection box. Because the output type of sensor and input type of evaluation board is different, connection box was necessary. Third one was evaluation board. The signal from the sensor was converted to digital signal in evaluation board. And this signal was transferred to device server. Fourth one was device server. Device server transferred the data from evaluation board to main computer. And the last one was other parts controlled by main computer in main computer, there were communication and diagnosis algorithms. The result was derived by main computer. In the result, there were 12 categories and 5 levels of motor conditions. The proposed system had some advantages comparing with stand alone type commercial motor fault diagnosis system. The first, by using remote access it was easier to get the conditions of motor. The second, there was no need to handle the sensors when users measured the motor signals. By this property, no one was necessary at motor location site. The third, this system was less restricted by times and places than commercial stand alone type diagnosis system. Therefore users can operate this system only using the main computer. Once the sensors are installed at the motor, users doesn't need to move to check up the condition of motors. Moreover, if there is ethernet hub, many motors can be not only diagnosed at once but also decreased its cost.

  • PDF

A Study on Changes in Competitive Factors: focused on Asian Neighbor ports (항만경쟁요인의 변화에 관한 연구 - 아시아 역내 인접 항만을 중심으로 -)

  • 이충배;이정민;양재훈
    • Journal of Korea Port Economic Association
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    • v.19 no.1
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    • pp.43-68
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    • 2003
  • With development of Asia's economy, the ports in trunk route have increased its handling capacity According to previous studies, main determinants to become hub-port are referred to location, connection inland transport with hinterland, port service availability and efficiency, cost of port handling, socio-economic stability and port information system etc. This study aims to investigate the changes in factors determine port's competitiveness particularly in Asian neighbor ports such as Hong Kong port and Shenzen port, and Singapore port and the Port of Tanjung Pelapas in Malaysia by comparing and analyzing main indicators relating to those ports. In conclusion, main reasons which gained competitiveness by newly developed ports such as Shenzen port and the Port of Tanjung Pelapas were port price and massive hinterland space offered.

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A Study on the Service Improvement through the Analysis of Current Status of e-Trade Platform Usage (전자무역 플랫폼의 이용현황 분석과 서비스 고도화 방안)

  • Lee, Sang-Jin
    • International Commerce and Information Review
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    • v.11 no.3
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    • pp.47-71
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    • 2009
  • In order to implement e-trade infrastructure through the radical innovation of trade process, e-trade platform which is called 'uTradehub' has been developed for three years. After pilot operation of this platform in 2007, the formal service of e-trade such as logistics, customs and foreign exchanges had been provided in 2008. However, the usage of e-Trade platform is not the level of users' satisfaction because trade-related communities have not actively participated into e-trade platform and several functions with users requirements are necessary to develop additionally. In this regard, there are strong demands to suggest some strategies for application and usage proliferation of e-trade platform. Therefore, this paper would like to evaluate the current status of e-trade platform service and usage by the theoretical consideration of preceding researches and practical analysis of statistical data. Then, it will explore several service improvement ideas in terms of system supplementation and integration, electronic documents standardization, radical change of using fee, global connection, user oriented education and advertisement.

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Multi-level structural modeling of an offshore wind turbine

  • Petrini, Francesco;Gkoumas, Konstantinos;Zhou, Wensong;Li, Hui
    • Ocean Systems Engineering
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    • v.2 no.1
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    • pp.1-16
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    • 2012
  • Offshore wind turbines are complex structural and mechanical systems located in a highly demanding environment. This paper proposes a multi-level system approach for studying the structural behavior of the support structure of an offshore wind turbine. In accordance with this approach, a proper numerical modeling requires the adoption of a suitable technique in order to organize the qualitative and quantitative assessment in various sub-problems, which can be solved by means of sub-models at different levels of detail, both for the structural behavior and for the simulation of loads. Consequently, in a first place, the effects on the structural response induced by the uncertainty of the parameters used to describe the environmental actions and the finite element model of the structure are inquired. After that, a meso-level FEM model of the blade is adopted in order to obtain the detailed load stress on the blade/hub connection.