• Proceedings of the SAREK Conference
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• 2009.06a
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• pp.973-978
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• 2009

In this study, the thermal environment characteristics of On-Off control and thermal difference proportional control method in floor radiant heating system were researched by computer simulation. For the analysis of unsteady heat transfer phenomena in household, the method of using electrical equivalent R-C circuit is applied, and radiation heat transfer between panel, ceiling and walls in household is calculated by enclosure analysis method. The parametric study on two control methods, conventional on-off control and temperature error based time control(T.E.B.T.C.) method, are performed to compare thermal heating control performances, respectively.

• Journal of Sensor Science and Technology
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• v.25 no.3
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• pp.189-195
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• 2016

In this paper, we newly introduce a visible light communication (VLC) repeater using the LED array in an LED lamp. The LED array is used for a light source in the repeater, which radiates light both for illumination and data transmission. A VLC repeater is made by adding some electronic circuits to the LED array including a photodetector, a demodulator, and a modulator. The repeater is installed on the ceiling of a room like a conventional LED lamp, receives the VLC signal from an arbitrary transmitter, recovers data, and radiates the signal to wide area in the room. We used a carrier frequency of 100 kHz for the uplink from a transmitter to the repeater, and 500 kHz for the downlink from the repeater to a receiver. The repeater is useful for increasing the transmission path to wide area over the obstacles that may exist between VLC transmitters and receivers.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.05a
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• pp.300-303
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• 2004

In this paper, floor impact noise reduction in a cruise ship cabin by using floating floor is studied. A mock-up is built by using 61 steel plate, and two identical cabins are made where 25t panel is used to construct wall and ceiling inside the steel structure. Various floating floor systems are tested for which normalized impact noise is measured according to ISO 140-7 It is shown that effect of VL(Visco-elastic Layer) is negligible when it is used between deck and mineral wool, since most vibration absorption occurs in the wool. In addition, direction of the mineral wool fiber affects impact noise significantly.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.05a
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• pp.131-136
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• 2004

Impact sounds, such as those created by footsteps, the dropping of an object or the moving of furniture, can be a source of great annoyance in residential buildings. The character and level of impact noise generated depends on the object striking the floor, on the basic structure of the floor, and on the floor covering. This study base on the evaluate of isolation performance of impact sound according to the impact noise reduction methods. Reduction methods consist of four ways. First way is increase thickness of bare floor and other ways are using the soft coverings on the floor and ceiling assembles. Last way is make floating floor with shock absorbing materials.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2000.06a
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• pp.843-848
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• 2000

This paper deals experimently with the difference between the cabins in ship-board and the reverberation chamber in sound transmission loss. Experimental results from the cabins show that there are various flanking transmission losses which deteriorate significantly the performance of the sound transmission loss. They also show that as a representative of the flanking transmission losses, sound leakages between a ceiling and a wall, the joints of the partitions, and the luminant devices play an important role. From the various measurements, it can be is concluded that unless one do not take any treatments on the flanking transmission loss, the field sound transmission loss will be considerably decreased by more than 10 dB, comparable to the sound transmission loss.

• Journal of Institute of Control, Robotics and Systems
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• v.13 no.8
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• pp.804-809
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• 2007

Initialization problem is defined for indoor mobile robot as a whole process from arrival to normal operation in a new environment. The unstructured environment make the process much more difficult compared to industrial robot in structured environments. We propose a simple and efficient initialization process based on artificial stars on ceiling. Important task points and paths connecting task points are defined based on the corresponding artificial stars. This approach can be used for all kinds of indoor mobile robots with landmarks used for indoor localization.

• Journal of the Korean housing association
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• v.9 no.3
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• pp.133-144
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• 1998

The purpose of this study is to analyze housing expectations and housing preferences of college students' first purchased house for the future. Data was collected through self-administered questionnaires for this study and the samples consisted of 797 college students. This study found that college students preferred a high-rise apartments, a 20-24 pyung (66.0㎡-79.2㎡) house in housing size and relatively new house. The housing features and interior features that college students like to have and expected to have in the first residence were different. Their housing expectations were fairly realistic considering their affordability. College students preferred to furnish video and audio equipments, exercise equipments and ceiling fans. They generally preferred hardwood floorings and decorative moldings and expected to have built-in closet in their master bedrooms. They expected to have linen closets and large mirrors in their bathrooms. They preferred ceramic tile counter tops, wood cabinets, vinyl floorings in their kitchens and they also preferred to use kitchen as a utility.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2004.11a
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• pp.67-73
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• 2004

The aim of this study is to analyze the tendency of the interior materials used for the apartment units of Mixed-use Apartment. One hundred fourteen cases of 15Mixed-use Apartment which were completed or under construction in Seoul and Bundang area before and after the year 2000 were the examples of this research. For the purpose of this research, following contents were analyzed accordingly. 1. The units were devided into entrance, living room, kitchen, bedroom and bathroom; and finishing material of the floor, wall and ceiling of each individual space were analyzed. 2. The units was categorized into three floor spaces(py) such as 30-49py, 50-70py, 80py and above. And each interior material of different floor spaces(py) were analyzed.

• Korean Institute of Interior Design Journal
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• no.23
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• pp.68-73
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• 2000

The purpose of this research is to develop interior construction cost-estimating system at the early stage of the project. Though general construction estimates are typically in quantitative, interior construction should be in rather qualitative. Therefore, design-concerned cost-estimating methods should be developed to manage interior projects from the early statge. 30 estimates of VIP-Zone interior projects, were examined to develop the general type of composition and material classification. The cost has been classified by construction parts such as wall, ceiling, floor, and doors & windows and their treatments. The composition and material related estimating system (CMRES) was consisted of the unit average costs of classification and the variation coefficients. The CMRESS was verified by the case study, and the results sowed that the difference between the actual estimate and the CMRES was competitively confident.

• Korean Institute of Interior Design Journal
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• no.23
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• pp.50-57
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• 2000

The purpose of this study was to examine the application tendency about the elements of the western classical style which appears in Korean commercial space. The examined objects were 436 pictures of 106 commercial spaces from the different monthly magazines between Sep. 1994 to Sep. 1999. The results of this study were as follows: 1. The tendency of application according to the kind of space, it has appeared much in restaurants and cafes which are being made into high-class centering around Kangnam area. As for the single application in commercial space, Renaissance style was shown most, and the cases applied through the mixture of Renaissance style and Neo-classic style appeared most. 2. The tendency of application arroding to the composition elements of space, the wall of Renaissance style and N대-classic style appeared similarly, and the ceiling of Renaissance style, the window and door of N대-classic style, the column of Renaissance style, and the furniture of Rococo style were being applied much.