• Journal of the Korean Society for Precision Engineering
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• v.13 no.3
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• pp.42-48
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• 1996

In this paper, a position correction system of industrial robot for door-chassis assembly tast is developed in connection with the position correction algorithm shown in Part I. Tow notches and a hole of auto chassis are selected as the reference measure points and a vision based error detection algorithm is devised to measure in accuracy of less than 0.07mm. And also, the transformation between base and tool coordinates of the robot is shown to send the suitable correction quantities caaording to robot's option. The obtained algorithms were satisfactorily implemented for a real door-chassis model such that the system could accomplish visually acceptable door-chassis assembly task.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.5
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• pp.2048-2053
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• 2011

The aim of this paper is to propose an energy harvesting system by converting mechanical energy of revolving door into electrical energy. The method of energy harvesting system is discussed on two methods: one is the energy-harvester using gear shaft coupling system, and the other is the energy-harvester using spiral spring system. The former is generated by coupling the shaft of rotating door with generator system, while the latter is generated by connecting end-effector of door with the string of generator system. We present the experimental results for two developed energy-harvester. Finally, a comparison between these results is presented to show the validity of energy-harvester.

• Current Optics and Photonics
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• v.1 no.2
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• pp.90-94
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• 2017

Visible light identification (VLID) is a user identification system for a door lock application using smartphone that adopts visible light communication (VLC) technology with the objective of high security, small form factor, and cost effectiveness. The user is verified by the identification application program of a smartphone via fingerprint recognition or password entry. If the authentication succeeds, the corresponding encoded visible light signals are transmitted by a light emitting diode (LED) camera flash. Then, only a small size and low cost photodiode as an outdoor interface converts the light signal to the digital data along with a comparator, and runs the authentication process, and releases the lock. VLID can utilize powerful state-of-the-art hardware and software of smartphones. Furthermore, the door lock system is allowed to be easily upgraded with advanced technologies without its modification and replacement. It can be upgraded by just update the software of smartphone application or replacing the smartphone with the latest one. Additionally, wireless connection between a smartphone and a smart home hub is established automatically via Bluetooth for updating the password and controlling the home devices. In this paper, we demonstrate a prototype VLID door lock system that is built up with LEGO blocks, a photodiode, a comparator circuit, Bluetooth module, and FPGA board.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.560-563
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• 2015

Door lock system is used for the conventional method by using a key or a card, a pad Replication, loss, and the risk of damage, and has a problem that exposure to others. In this paper, Bluetooth communication and OTP built into smartphones in order to complement the existing door lock system problems OTP(One-Time-Password), Hide-Key utilizing the authentication method and the Arduino smartphone-based design of wireless OTP door lock system by enabling users it allows for more convenient and safe life free from the risk of theft and robbery.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.10a
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• pp.261-263
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• 2017

Future science fiction science film science fiction film can easily see the appearance of the futuristic inquiry. Even if a person does not open the door by force, the door is opened and closed by the system. Even now, such a door can be found easily. However, in the past, people who have not been able to perceive people have been used only in public places such as department stores and marts, where there are many people who are inundated. However, a lot of researches are being done now, and we are pursuing convenience in everyday life by integrating the image processing technology that has been developed and developed many times, by implementing the automatic door which is not infringed by the personal life and is impossible for anyone to access.

• Archives of design research
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• v.5 no.1
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• pp.7-20
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• 1992

Since 80th, in the monetary markets due to the escalation of creditable promptness dealing of financial goods, Korea monetary business has been confronted with structual contradictions. The first like a men power reduction, inorder to meet and satisfying with cost reduction policy of the holding firms and secondly, escalation and expention of business networks or facilities inorder to meet and satis~'ing with customers continuously seeking for prompt, acurate, and helpfulness service nearly like one similar to a door to door service. Accordingly, the firms eventually poured mere sweaty money into procuring such devices for upgrading. On the contrary, however, regardless the escalation monetary expenditure may be, inorder to promote quality of the same devices are keen necessary because present days customer groups were tended to receives ample service almost like door to door service without moving too$$\mu$h apart from the immediate spot where they belongs tl or veryspot of where actually they spend instead of deep consideration of natures, quality or sttractiveness of service medias what they can received from. Under the present circumstance, the financial business firms, however, would highly suffering and recei\ulcornerves pressures from imblalance natures ofincoming and out go of the business budget due to excessive inc1ease of managerial expences. For these reasons, therefor, in order to solves, compensates, improves, and developes most effective fina\ulcornerncial service for customers can use under most pleasant environment, the establishment of adequate standardization of such service devices based on the foregoing environmental circumstances. This analytical study, therefor, mainly aimed and emphasized based on pre- estimatimation of proper de\ulcornervlopment and use of the unattended servicing devices such as Cash Dispenser and Auto Teller Machine bygeneralization, automating. and innovation of design to meet compactness and door to door like convenient service for customers which can be achieved by performing constant comparative analysis and continual study toward development of such devices those of which produced by Five (5) major domestic producers aro~nd the country.

• Archives of design research
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• v.5 no.1
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• pp.21-36
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• 1992

Since 80th, in the monetary markets due to the escalation of creditable promptness dealing of financial goods, Korea monetary business has been confronted with structual contradictions. The first like a men power reduction, inorder to meet and satisfying with cost reduction policy of the holding firms and secondly, escalation and expention of business networks or facilities inorder to meet and satis~'ing with customers continuously seeking for prompt, acurate, and helpfulness service nearly like one similar to a door to door service. Accordingly, the firms eventually poured mere sweaty money into procuring such devices for upgrading. On the contrary, however, regardless the escalation monetary expenditure may be, inorder to promote quality of the same devices are keen necessary because present days customer groups were tended to receives ample service almost like door to door service without moving too$$\mu$h apart from the immediate spot where they belongs tl or veryspot of where actually they spend instead of deep consideration of natures, quality or sttractiveness of service medias what they can received from. Under the present circumstance, the financial business firms, however, would highly suffering and receives pressures from imblalance natures ofincoming and out go of the business budget due to excessive inc1ease of managerial expences. For these reasons, therefor, in order to solves, compensates, improves, and developes most effective financial service for customers can use under most pleasant environment, the establishment of adequate standardization of such service devices based on the foregoing environmental circumstances. This analytical study, therefor, mainly aimed and emphasized based on pre- estimatimation of proper devlopment and use of the unattended servicing devices such as Cash Dispenser and Auto Teller Machine by generalization, automating. and innovation of design to meet compactness and door to door like convenient service for customers which can be achieved by performing constant comparative analysis and continual study toward development of such devices those of which produced by Five (5) major domestic producers around the country.

• Fire Science and Engineering
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• v.33 no.1
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• pp.30-38
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• 2019

Mixing characteristics and backdraft dynamics were investigated using large eddy simulation for compartments initially filled with methane fuel. Four different opening geometries, i.e. conventional door opening case (Door) and the cases where horizontal door was implemented on the upper ($Slot_U$), middle ($Slot_M$) and lower part ($Slot_L$) of side wall, were considered in the simulations. For cases without ignition, the amounts of inflow oxygen and outflow fuel from the compartment opening were, from largest to smallest, Door > $Slot_U$ ~ $Slot_M$ > $Slot_L$. However, the fuel and oxygen were the best mixed for the $Slot_U$ case while the fuel and oxygen were not well mixed and in relatively separated two layers for the $Slot_L$ case. The global equivalence ratio defined by the amounts of fuel and oxygen in the compartment was not correlated reasonably with the peak pressure of backdraft. The peak pressure during backdraft was the highest for the $Slot_U$ case, a well mixed condition of fuel and air, and backdraft was not found for the $Slot_L$ where the pressure rise was not so high due to the mixing status. The peak pressures for the Door and $Slot_M$ cases were in between Door and $Slot_L$ cases. The peak pressure during backdraft was well correlated with the total amount of heat release until the instance of backdraft occurrence.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.11a
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• pp.155-156
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• 2023

In the case of steel door frames commonly found in general buildings, there are various assembly methods such as rivets, bolts, and welding, but the welding method is generally used. However, this welding joint method has many problems, such as distortion due to heat and damage due to external shock. In particular, when used as a fire door, problems may occur in the event of a fire due to distortion caused by heat from welding and the weak welded joint area. In the case of rivet or welded joints, when moved after assembly, joint loosening due to external shock may occur. Problems may arise where the bonding strength becomes weak. In addition, with the recent increase in high-rise buildings and larger buildings, when assembly is completed and brought to the site, a place is needed to store it, and in addition, there is a problem in that it has to be transported several times in small quantities to the installation site, which is another problem of time and cost loss. This is coming to the fore. In order to fundamentally solve this problem, we have researched and developed a non-welding door frame that can be assembled on site. We have researched and developed three assembly methods: screw-type, insert-type, and protrusion-type. Non-welded door frames are small in size and easy to package, making them advantageous for domestic and overseas exports.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.05a
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• pp.900-902
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• 2015

Doors are to be the most basics of our lives from opening, closing and even keeping our property. Hence, doors have been innovated to blend in and make our daily lives more convenient. However, we find it difficult to open and close the doors manually of offices or tour zones, where they open and close at a precise time everyday. To solve this, we added a dimension of time to previous Door Locks. By this, every door with this specific door lock will open and close at a certain time we want them to open or close. Also, through the application you can control the time or use it to open and close the doors remotely. In order to do this, we systemed the door lock time system based on Java Programing language to make it easy to communicate and open or close the doors through smart phone applications, with the C programming language for the ATmega128 which will open and close the doors.