• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.3086-3091
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• 2011

Many types of door system are used in the Electric Multiple Unit (EMU). The door system is categorized to the two types of door system, sliding door and plug door. The sliding door is widely used in the EMU but has weak point for the noise problem. The plug door has advantages for the noise reduction characteristic. Nowaday electric door system is widely used and motor is a main part of driving system in the door system. We have to know the exact driving position of door system to control proper operation of the door. Actually encoder or tachometer is used for the position controlling, but it makes price increase and failure increase. In this paper, we study and describe motor current calculation method to contol and know exact driving position of door system.

• 한국의료질향상학회지
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• 제3권1호
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• pp.144-152
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• 1996

Background : Because of introduction of nationwide health care system in 1989 and the improvement of socioeconomic status of population the number of outpatient visiting university hospital has good facilities and manpower has increased. So the waiting time for medical service at university hospital are lengthened. Particularly outpatients complain that waiting for prescribed drugs at pharmacy depart are long. Reducing waiting time at pharmacy depart door-to-door delivery system that the patients applying for door-to-door delivery receive prescribed drug at home without waiting at pharmacy depart were studied. The objective of this study is to analysis the opinion of outpatients for door-to-door delivery system, to study the appropriateness of adopting the system and to produce ideal model for the system. Method : Outpatients waiting drug at pharmacy depart were questioned about door-to-door delivery system. to find the factors affect utilizing the system the logistic regression was used. Result : 83.3% of the patients want to utilize the system without charging, and 72.9% of the patients want to utilized system with charging. 68.3% of patients with charging want to use this system because of long waiting time at pharmacy depart. 50% of patients who do not want to use door-to-door do not use this system because of incorrect delivery. The affecting factors to utilize the system were sex, waiting time, fee. Conclusion : The model for door to door delivery system. 1. door-to-door personnel reside in hospital and the patient want to utilize the system apply for the delivery with charging. 2. The applied drugs dispense at spare time. 3. Delivery company gathers drug at appointed time and delivers. 4. The delivery fee is 2,000-3,000 won. 5. To prevent from loss and changing the drug the name of patient on packet are printed and drug packet are sealed. 6. The company submit the confirm sheet which are written that the patient received drug correctly to hospital. 7. The delivery time of drug is reserved for the convenience of receiving.

• 한국시스템다이내믹스연구
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• 제12권1호
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• pp.89-114
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• 2011

With steady increase in the demand for door-to-door delivery services, courier service providers are facing a constant pressure to reduce delivery price in order to secure quantity order and to improve the efficiency and reliability for customer service. The objective of this research is to explain the structure of the door-to-door delivery including door-to-door delivery service demand, sorting capacity in the hub-terminal, and the system performance measures such as service reliability networks using causal loop diagram(CLD). Based on causal relation, this research describes a comprehensive approach to examine how capacity reliability contributes to the renewal of the firm's competences through its reciprocal relationship with travel time reliability and connectivity reliability. Also, this research suggests the policy alternatives to improve effectiveness and efficiency of door-to-door delivery network in response to increase customer satisfaction and profit maximization of the courier service providers: operational, tactical, and strategic levels.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2000년도 전력전자학술대회 논문집
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• pp.564-567
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• 2000

Recently A Elevator system is specially important in human. life Also a elevator door is important to a elevator system. Normally a elevator door was moved by arm chain or belt. In this paper velocity pattern generation method was proposed for elevator door and reopen method which need to elevator door system was proposed, and descript the inverter system design method for the elevator door.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1348-1356
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• 2011

The passenger side entrance door is very important system that make boarding and getting off the passengers. During the passenger door closing, there is some obstacles between door panels, passenger door can detect the obstacle and obstacle is remained between door panels, vehicle can no possible to move. But passenger door can not detect the obstacle if obstacle is too thin such as clothes and belts. So, anti-drag system is applied the to make detect these thin obstacle. Therefore, we survey the characteristic, function and its activation scenario of anti-drag system and present the passenger door system that latest applied anti-drag system that can be a help to make design.

• 산업기술연구
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• 제29권A호
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• pp.155-159
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• 2009

Recently, a Elevator system is specially important in human life. Also a elevator door is important to a elevator system. In this paper, induction motor drive system using vector control was developed with high performance for elevator door system. For this, velocity pattern generation method was proposed. The proposed system is verified by experimental result with 400[w] induction motor drive system for the elevator door.

• 산업기술연구
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• 제25권B호
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• pp.189-193
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• 2005

In this paper we proposed the remote control system for the door lock by the unified modem with the wireless and the power line modem. We developed the management system program between the door-lock system and the proposed unified modem. The infrared communication system was used between the Door-Lock system and the power line modem. With the unified developed modem and the Door-Lock system, it is possible to control remotely the developed system in the internet service area.

• 한국철도학회논문집
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• 제5권2호
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• pp.112-117
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• 2002

Reduction of noise level in the cabin of urban transit unit is an important issue to enhance the comfortability of passengers. It is made clear that a cause of increased noise level in cabin is the imperfect airtightness of entrance doors. In this study, the sliding-plug door system is developed to reduce the noise level of cabins by securing the airtightness of entrance door. The sliding-plug door system is composed of air-driven engine, swing arms, guide rails, guide rollers and locking devices. It is economical owing to using the previous door engine system. It is also adequate for the platform system of our subway station. It was tested to prove the reliability of system and was applied to standard urban transit unit. The effectiveness of noise reduction in cabin resulting form the sliding-plug door system was confirmed by test results.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 추계학술대회
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• pp.86-88
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• 2017

디지털 도어락은 비밀번호 방식을 적용한 전자식 도어락이며, 문을 닫을 때 자동으로 문을 잠궈주는 기능이 있어 외출 시 문단속에 대한 걱정을 없애주었다. 이러한 편의성을 무기로 점차 시장이 확대되어 나갔으며, 기술이 점차 발전함에 따라 반도체 키 방식, RFID, 지문인식 등 여러 가지 인증 기술이 추가로 도입되었다. 그러나 도어락 키의 복사 위험이 있고, 비밀번호 도용 및 침해가 있다. 이 논문에서는 사용자가 이러한 위험을 보완하기 위해 스마트 폰으로 잠금을 해제 하거나 열 수 있는 원격제어 시스템을 개발한다. 개발하려는 시스템은 와이파이를 이용하여 스마트 폰으로 문이 잠금이 되었는지 열려있는지 확인이 가능하고, 원격으로 문을 잠그거나 열 수 있다.

• 한국안전학회지
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• 제35권1호
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• pp.12-17
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• 2020

This paper analyzes functions of component parts of D-Urban Railway's door system along with operation obstacle risks on frequency(the number of occurrences/year) and severity(delay time/the number of occurrences). Based on this, the paper presents improvements and current system's problems after obstacle risks of EMU and door system are appled. The obstacle of door system causes corrosion of main parts such as DCU due to heat problem of operation environment, problems of maintenance methods and deterioration. DCUs on PCBs with more than 50% pattern corrosion cause problems. Even though the number of door system's obstacle occurrences for the last 5 years is 42, along with 104 minutes of operation obstacle, EMU operation obstacle risk is low(Level 1), which indicates there is limit in matrix of railway risks presented by the standard of railway safety management system. Therefore, it is necessary to have railway risk matrix suitable for the field. Finally, the paper deducts the obstacle risks through frequency and severity. Since 2017 when the risks of EMU and door system's obstacle, that of EMU has been 24(47% reduced) and that of door system has been average 9.5 per year(23% reduced).