• 드라이브 ㆍ 컨트롤
• /
• 제13권1호
• /
• pp.1-9
• /
• 2016

Nowadays automatic transmission equipped vehicles prevail in construction and agricultural equipment due to their convenience in driving and operation. Though domestic vehicle manufacturers install imported electronic controlled transmissions at present, overseas products will be replaced by domestic ones in the near future owing to development efforts over the past 10 years. For passenger cars, there are many kinds of shift control algorithms that enhance the shift quality such as feedback and learning control. However, since shift control technologies for heavy duty vehicles are not highly developed, it is possible to improve the shift quality with an organized control method. A feedback control algorithm for neutral-into-gear shift, which is enabled during the inertia phase for the master clutch slip speed to track the slip speed reference, is proposed based on the power transmission structure of TH100. The performance of the feedback shift control is verified by a vehicle test which is implemented with firmware embedded TCU. As the master clutch engages along the predetermined speed trajectory, it can be concluded that the shift quality can be managed by a shift time control parameter. By extending the proposed feedback algorithm for neutral-into-gear shift to gear change and shuttle shift, it is expected that the quality of the shift can be improved.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 1999년도 춘계종합학술대회
• /
• pp.266-271
• /
• 1999

무선국의 통신장비에 할당된 주파수 자원은 한정되어 있으나 통신량의 계속적인 증가에 따라 이것 그러므로 SSB, VHF 둥 기존의 통신장비를 원격제어로 운용하는 무선국에서 간단한 방법으로 채널의 변환, PTT제어, 송신주파수 및 출력을 모니터할 수 있는 시스템을 구현하고자 한다. 송수신기와 단말기 사이의 제어신호 교환은 음성신호가 전달되는 2선의 트위스트 실선 또는 전화회선을 공유하며, ASK에 의한 채널의 up/down과 PTT의 제어, 양측에 MCS-51계열의 프로쎄서를 사용하여 FSK에 의한 시리얼통신으로 송신제원을 모니터할 수 있는 H/W의 설계 그리고 단신방식의 통신운용에 따른 순차적인 통신시퀸스와 프로토콜 및 데이터전송에 대한 알고리즘을 연구하였다. 통신시퀸스의 S/W 는 멀티-프로세싱 기법을 활용하여 마스터 프로쎄서에 의한 다수의 단말기 프로쎄서에서 특정의 송수신기에 접속을 요구하는 회선접속시스템으로 연계될 수 있도록 하였다.

• 한국철도학회논문집
• /
• 제20권5호
• /
• pp.602-611
• /
• 2017

철도시스템에서 이동 중인 열차와 지상과의 정보교환은 위치검지, 열차제어 등 다양한 분야에서 매우 중요한 역할을 수행하고 있다. 열차와 지상간의 정보전송을 위한 매체로 대부분 궤도회로가 사용되어 왔으나, 궤도회로는 지상에 선로를 따라 연속적으로 설치되어야 하므로 설치 및 유지보수 비용의 증대를 초래한다. 이러한 문제를 해결하고자 최근에는 연속적인 정보전송(무선통신)과 불연속적인 정보전송(트랜스폰더)을 혼합하는 방식으로 변화되고 있다. 본 연구에서는 400km/h의 고속으로 이동하는 열차에서 지상과 차상간 정보전송이 가능한 트랜스폰더 시스템을 개발하기 위하여, 현장설치 및 유지보수가 효율적인 수동형 태그에 구동전원을 공급하기 위한 무선전력전송용 리더 및 태그 안테나를 설계하고, 시뮬레이션 및 시작품 제작을 통하여 그 성능을 확인하였다.

• Parasites, Hosts and Diseases
• /
• 제47권3호
• /
• pp.269-273
• /
• 2009

A 57-year old man who was admitted to an emergency room of a tertiary hospital with hemoptysis developed malarial fever 19 days later and then died from severe falciparum malaria 2 days later. He had not traveled outside of Korea for over 30 years. Through intensive interviews and epidemiological surveys, we found that a foreign patient with a recent history of travel to Africa was transferred to the same hospital with severe falciparum malaria. We confirmed through molecular genotyping of the MSP-1 gene that Plasmodium falciparum genotypes of the 2 patients were identical. It is suggested that a breach of standard infection control precautions resulted in this P. falciparum transmission between 2 patients in a hospital environment. This is the first report of a nosocomial transmission of falciparum malaria in Korea.

• 한국콘텐츠학회논문지
• /
• 제8권1호
• /
• pp.177-185
• /
• 2008

응용분야를 계속 확장해가고 있는 무선 센서네트워크에서 매체접근제어 (MAC)에 관한 연구는 주로 에너지 효율을 높이는데 집중되어왔으며 전송지연(Latency)에 관한 연구는 상대적으로 적다. 그러나 센서 네트워크의 특성상 다중 홉(multi-hop) 전송이 빈번하게 일어나는 환경에서 종단 간 전송지연은 특히 시간 종속적인 응용분야에서는 중요한 성능상 제약이 될 수 있다. 본 논문에서는 분산적인 전송전력제어방식을 이용하여 다중 링크를 동시에 개설할 수 있도록 함으로써 센서네트워크의 전송 전력을 줄임과 동시에 네트워크의 공간 활용도를 향상시키고 전송지연시간을 개선 할 수 있는 매체접근제어(MAC) 방식을 제안하였다. 시뮬레이션을 통한 성능 검증 결과 제안하는 방식인 TPCS-MAC은 센서노드의 전력소모를 줄임과 동시에 특히 다중 홉(multi-hop) 센서네트워크에서 발생하는 종단 간 지연 (end-to-end latency) 문제를 개선하는 것으로 판명되었다.

• 유공압시스템학회논문집
• /
• 제6권1호
• /
• pp.10-16
• /
• 2009

Automatic power transmission systems consisted of a torque converter and several planetary gear sets, clutches and brakes are controlled by a hydraulic shift control circuit and an electronic transmission control unit. The hydraulic circuit serves for the operation of the torque converter and lubrication oil supply of the transmission system as well as for the actuation of clutches for the automatic gear shift. The complicated hydraulic control circuit constructed by many spools, solenoids, orifices and flow passages are integrated into one small valve block and it is powered by one hydraulic pump. In this paper, a test equipment was developed to measure the oil consumption of each component at various wide operating conditions. Test data about 730 sets acquired from five test items are analyzed and discussed on the oil capacity of the circuit.

• 한국안전학회지
• /
• 제16권4호
• /
• pp.200-207
• /
• 2001

회전하는 기계에서 전달되는 조화적인 진동력이 수동 및 능동 진동 격리기를 통하여 중간 지지구조물에 어떻게 전달되는 것인가를 연구하였다. 이를 위하여 이론적인 모델은 모든 축에 대하여 수평과 수직방향의 힘과 모멘트를 고려하여 작성되었으며, 실험은 중간 구조물에 전달되는 회전방향 및 직선방향의 진동을 최소화하기 위하여 2단으로 구성된 중간 지지구조물에 부착된 진동 액츄에이터를 사용하였다. 진동원에 의하여 발생된 진동이 에러 센서에서 측정되었으며 제어원과 에러센서사이의 전달함수가 측정되었다. 1-100Hz사이의 주파수 범위에 있어서 기존의 수동격리기와 직렬로 설치된 능동격리기를 통하여 전달된 힘이 실제로 감소되었음을 실험결과를 통하여 확인하였다.

• Smart Structures and Systems
• /
• 제24권1호
• /
• pp.1-14
• /
• 2019

Transmission tower-line system is one of most critical lifeline systems to cities. However, it is found that the transmission tower-line system is prone to be damaged by earthquakes in past decades. To mitigate seismic demands, this study introduces a tuned-mass damper (TMD) using superelastic shape memory alloy (SMA) spring for the system. In addition, considering the dynamic characteristics of both tower-line system and SMA are affected by temperature change. Particular attention is paid on the effect of temperature variation on seismic behavior. In doing so, the SMA-TMD is installed into the system, and its properties are optimized through parametric analyses. The considered temperature range is from -40 to $40^{\circ}C$. The seismic control effect of using SMA-TMD is investigated under the considered temperatures. Interested seismic performance indices include peak displacement and peak acceleration at the tower top and the height-wise deformation. Parametric analyses on seismic intensity and frequency ratio were carried out as well. This study indicates that the nonlinear behavior of SMA-TMD is critical to the control effect, and proper tuning before application is advisable. Seismic demand mitigation is always achieved in this wide temperature range, and the control effect is increased at high temperatures.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
• /
• pp.33-33
• /
• 2000

In this paper a new distributive control system for BA(Building Automation ) lighting control used on general microprocessors is presented. For optimal lighting control and saving energy, The system have to control the group and pattern lighting control as well as individual light control at one time. Tn this paper, This functions are accomplished with low-cost and simple microprocessor. A plurality of modulated light control terminals are connected to the central control unit through a pair of power line. This power line provide both power and signal to the each terminal and the data is transmitted through cyclic time division multiplex transmission. With this structure a low-cost distributive control system for lighting applications has been achieved, allowing energy and maintenance saving and reliability increase of the light control system.

• Tuberculosis and Respiratory Diseases
• /
• 제80권1호
• /
• pp.21-26
• /
• 2017

It is well established that health care workers (HCWs) have a considerably higher risk of occupationally acquired tuberculosis (TB). To reduce the transmission of TB to HCWs and patients, TB infection control programs should be implemented in health care settings. The first and most important level of all protection and control programs is administrative control. Its goals are to prevent HCWs, other staff, and patients from being exposed to TB, and to reduce the transmission of infection by ensuring rapid diagnosis and treatment of affected individuals. Administrative control measures recommended by the United States Centers for Disease Control and Prevention and the World Health Organization include prompt identification of people with TB symptoms, isolation of infectious patients, control of the spread of the pathogen, and minimization of time spent in health care facilities. Another key component of measures undertaken is the baseline and serial screening for latent TB infection in HCWs who are at risk of exposure to TB. Although the interferon-gamma release assay has some advantages over the tuberculin skin test, the former has serious limitations, mostly due to its high conversion rate.