• Archives of design research
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• v.17 no.1
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• pp.179-190
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• 2004

The human effort to make personal privacy and safety from outer environment has brought the improvement of security system through the technological development. Especially as a apartment dwelling and lifestyle is general, the role and function of door lock system is more important than ever. The research for user-centered approach and design on the door lock system should be implemented under the circumstances. This study has focused on the development of making safety as well as easy interface to design door lock system. The price also is competitive as compared with other door lock products. The goal of this study is to propose the alternatives not only to develop door lock design but also to search the innovative way of locking system design.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.10a
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• pp.86-88
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• 2017

The digital door lock is an electronic door lock that uses a password system and has the function of automatically locking the door when the door is closed, thus eliminating the worry about the door lock. As the technology has gradually developed, various authentication technologies such as semiconductor key system, RFID, and fingerprint recognition have been introduced. However, there is a danger of copying the door lock key, and there are password stealing and infringement. In this paper, we develop a remote control system that can unlock or open a smartphone to supplement the user's risk. The system you are going to develop can use WiFi to check if the door is locked or open on your smartphone, and you can lock or unlock the door remotely.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.7
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• pp.1439-1445
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• 2009

This paper introduces a simulation model regarding the process analysis of a digital doorlock mixed assembly process. The objective of the simulation model is to evaluate the performance of various design aspects of process alternatives. To develop the simulation model, a time study is performed for each process. Next, by using ARENA, a simulation model is conducted based on the process analysis and the line balancing methodology. We found out several problems for mixed assembly process, and then suggest several alternatives to improve the system.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.17 no.5
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• pp.76-83
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• 2018

A cabinet-door integrated finite element model was constructed for a built-in side-by-side refrigerator with an ice dispenser, and its deformation was analyzed using the ANSYS finite element software. As loads, the food load needed to fill in the cabinet and doors and the thermal load occurring during normal operation conditions were taken into consideration. The door height difference (DHD) and door flatness difference (DFD) between the two doors of the freezing and refrigerating compartments were derived. The DHD and DFD under the assembled condition without applied loads satisfied the acceptance criteria specified by the refrigerator manufacturer. It appeared that the food load increases the DFD slightly. The thermal load tends to increase the differences because of the thermal deformation, especially the DFD, of the cabinet and doors.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.305-306
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• 2016

In other areas, if the job or university or travel to other areas the firsth problem is Accommodation. When you get home to get around, There is no place to stay. Also of travelers want to Personal Space more than Space group. To solve this problem In this paper,It provides a house through a door lock that do not use the remote control system. The system provides a room that is available to users and can be controlled by setting the password to a remote door lock. In addition, by using the NFC provided a convenience so that the user can use forgotten the password. Information and reviews of the house were available to help you manage the cloud system.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.618-620
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• 2013

네트워크 및 컴퓨팅 기술의 발달로 데이터를 위탁 저장하고 이를 언제어디서든 다양한 단말로 처리 할 수 있는 클라우드컴퓨팅서비스가 활성화되고 있다. 특히 클라우드컴퓨팅 서비스 중 DaaS가 널리 사용되고 있다. 하지만, 위탁 저장된 데이터베이스에 신체 정보라던가 개인의 민감한 정보가 암호화 없이 저장된다면 서버에 저장된 데이터를 데이터 소유주의 동의 없이 공격자 및 비윤리적인 서버관리자가 열람할 수 있다는 보안 문제점이 있어 위탁 저장된 데이터베이스의 암호화가 필요하다. 하지만 기존에 사용되고 있는 암호화 알고리즘으로 암호화된 데이터를 안전하게 검색하기 위해선 암호화 데이터를 전부 데이터 소유자의 단말기에 내려 받고 전부 복호화해서 검색해야 하기에 데이터를 위탁 저장하는 의미가 퇴색된다. 이와 같은 문제를 해결하기위해 검색 가능한 암호시스템(Searchable Encryption System)이 등장하게 되었다. 하지만 기존의 검색가능 암호 시스템은 같은 키워드를 검색하기위해 생성된 트랩도어가 동일한 형태를 가지게 된다. 수많은 검색 쿼리들이 위탁저장소에 전송되며, 저장소의 관리자는 쿼리를 통해 키워드를 유추하고, 쿼리를 통해 사용자가 어떤 데이터를 저장하고 검색하는지 학습이 가능하기 때문이다. 따라서 본 논문은 동일한 사용자가 같은 키워드를 검색하더라도 매번 다른 트랩도어가 생성되도록 하여 비윤리적인 서버관리자가 검색 쿼리를 통해 검색 내용 및 데이터를 유추할 수 없도록 하는 일회용 트랩도어를 이용한 검색가능 암호 시스템을 제안한다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.05a
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• pp.147-148
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• 2023

Steel doors, which are common in general buildings, do not seal the gap between the door and the floor, so drafts, noise, dust, and lights flow from the outside, and shielding devices are installed in various materials and methods, such as adding magnetic gate paper to the side of the door or installing a gasket under the door, but performance is limited. Accordingly, in order to fundamentally solve these problems, we researched and developed a double gap blocking device that can improve fire resistance and airtightness performance in steel doors. Unlike general products, the double gap blocking device has the advantage of maximizing airtight performance by forming an air layer in the center when the door is closed, as well as greatly improving the fire resistance performance, which is the basic performance of the fire door.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.582-584
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• 2023

연합학습(Federated Learning)에서는 여러 참가자가 서로 간의 데이터를 공유하지 않고 협력하여 하나의 모델을 학습할 수 있다. 그 중 수직 연합학습(Vertical Federated Learning)은 참가자 간에 동일한 샘플에 대해 서로 다른 특성(Feature)를 가지고 학습한다. 또한 서로 다른 특성(Feature)에는 입력의 라벨(Label)도 포함하기 때문에 라벨을 소유한 참가자 외에는 라벨 정보 또한 접근할 수 없다. 이처럼 다양한 참가자가 학습에 참여하는 경우 악의적인 참가자에 의해 모델이 포이즈닝 될 여지가 존재함에도 불구하고 수직 연합학습에서는 관련 연구가 부족하다. 포이즈닝 공격 중 백도어 공격은 학습 과정에 관여하여 특정 입력 패턴에 대해서 모델이 공격자가 원하는 타겟 라벨로 예측하도록 오염시키는 공격이다. 수직 연합학습에서는 참가자가 학습과 추론 모든 과정에서 관여하기 때문에 백도어 공격에 취약할 수 있다. 본 논문에서는 수직 연합학습에서의 최신 백도어 공격과 한계점에 대해 분석한다.

• Journal of Korea Society of Industrial Information Systems
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• v.17 no.7
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• pp.35-41
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• 2012

To control screen door installed in the subway platform, geared BLDC motors have been being used. However, because of the geared mechanisms, the control profile of the screen door in slow speed is very poor. Moreover, geared mechanism tends to leads system malfunctions and low efficiency. To overcome those problems, in this paper, the techniques of developing hi-efficiency direct drive gearless PMAC motor controller and application example to control the screen door of subway platforms are proposed. The developed system has advantages that; the energy efficiency has been increased by adopting gearless PMAC motor; the system break-down factor has been decreased due to the actuator mechanism has been simplified. In this paper, the screen door control system structure, PMAC motor drive circuit design, implementations of vector control algorithm, and test results are shown.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.5
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• pp.267-274
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• 2018

This paper introduces a smart door system composed of security system and secretary system. As ratio of single households increase, the security of household became more important. Also already there were a lot of artificial intelligence secretary system based on voice called smart home technology. But It has limits. It can not work without user's requests. That mean it is not automatic. And the voice recognition depend on user's pronounce. Thus in this paper, we design and develop smart door system that is added function of security and secretary. That can inform users that there are outsider in front of their house in real time. Also that can speak information such as user's requirements, delivery and weather information using TTS. As a result they can prevent crimes and use convenient secretary system.