• Title/Summary/Keyword: door opening

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Design of Heavy Weight Door Hinge for Built-in Appliances (빌트인 가전기기용 고 중량 도어힌지의 설계에 관한 연구)

  • Choi, Seong-Dae;Byn, Yong-Kun;Kim, Gi-Man
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.7
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    • pp.41-47
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    • 2021
  • In this study, the hinges of heavy weight doors were designed and analyzed in line with the trend that built-in appliances are becoming larger and the weight of doors is also increasing. The main specification of the heavy weight door hinge is to allow the deflection at the end of the door to be less than 2 mm when opening and closing, including the automatic closing, slow closing, and closing force control functions. The structural analysis of the design mechanism, component design, and methods for improving the deflection are as follows: 1) Mechanism of the automatic closing function should sense automatically using the spring compression force at a specific angle by the contact between the cam and the cam module roller. 2) Through structural analysis, the maximum stress of the door was found in the link pin hole connected to the pin at each link. 3) Consequently, the pin holder was designed and applied, with little variance, but up to 93% of the specification limit.

Experiments of Water Mist System Application for Rack Storage (랙크식 창고에 대한 미분무 시스템 적용성 실험)

  • Myoung, Sang-Yup;Kim, Jong-Hoon
    • Journal of the Society of Disaster Information
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    • v.16 no.4
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    • pp.627-637
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    • 2020
  • Purpose: This experimental study was conducted to find out whether a water-mist fire suppression system can be applied to C.E.P., a representative combustible material of a rack storage. Method: First, it was confirmed whether the water-mist fire-extinguishing system used in this experiment was capable of extinguishing oil fires. After that, the C.E.P. boxes were loaded in the same small space as used in the oil fire experiment, and then the experiment was conducted on three scenarios; door opening, door closing, and door closing and increasing the internal load. The scenario was set considering the opening and space size conditions, which are important factors for the water-mist fire suppression. Result: Oil fire suppression tests have shown that fires are well extinguished in both the door open and closed conditions. In case of a fire of C.E.P. boxes in the same space condition as an oil fire, the fire was not extinguished in the door open condition. Fires were extinguished in the case with the door closed condition, but the afterglow was confirmed. Conclusion: In the oil fire suppression test, a water-mist fire suppression system extinguished a fire in both the door open and closed conditions. However, for the C.E.P fire, it was possible to extinguish only under the door closed condition, and there was a possibility of re-ignition.

Predicting Influence of Changes in Indoor Air Temperature and Humidity of Wooden Cultural Heritages by Door Opening on Their Conservation Environment (개방에 따른 실내 온습도 변화가 목조문화재 보존환경에 미치는 영향 예측)

  • Kim, Min-Ji;Shin, Hyun-Kyeong;Choi, Yong-Seok;Kim, Gwang-Chul;Kim, Gyu-Hyeok
    • Journal of the Korean Wood Science and Technology
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    • v.43 no.6
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    • pp.798-803
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    • 2015
  • This study was conducted to predict the effect of door opening in wooden cultural heritages (WCHs) on their conservation environment. For this prediction, measured relative humidity (RH) and surface wood moisture content (MC) of inner part of wood columns in open wooden building and neighboring closed wooden building were compared with minimum RH, including the duration of minimum RH, and MC required for spore germination and resultant growth of wood-degrading fungi reported in some literatures. Moisture conditions, namely RH of inside wooden building and MC of wood was unsuitable for decay and sap-stain fungi all the year round; however, moisture conditions during summer season was suitable for spore germination and resultant growth of surface mold fungi, regardless of door opening. When compared, the duration of minimum (75%) or higher RH and the number of wood columns with MC level greater than the minimum MC (15%) during summer season, the surface mold related to the conservation environment of inside wooden building was somewhat better in open building than in closed building. Rather, doors should be opened in closed building for reducing indoor RH as a necessary measure during summer season when outdoor RH is high.

Tracking of an Object using Image Processing and Kalman Filter on the Guidance System (길안내 시스템에서의 영상처리와 칼만필터 이용한 물체추적)

  • 송효신;지창호;배종일;이만형
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.500-504
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    • 2002
  • The purpose of this paper is to implement a guidance system for an object on the road. A watch camera equipped on the auto door recognizes the direction for the destination of an object, after that it determines whether opening or closing the door, and then the door is opened automatically, based on the decision. The motion of the moving object is approximated by using the technique of the image processing of tracking images and the affine model. The direction of the moving object is predicted from image information obtained by applying linear Kalman filter to the motion estimation in order to reduce the search region, the moving position, and the direction of the center of the object. Along with the guidance function, the system has the announcing function to the object. The experimental results confirm the veridity and applicability of the proposed system.

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Development of Trawl Monitoring System ( 1 ) - Distance Measuring System between Trawl Doors - (트롤 모니터링 시스템의 개발에 관한 연구 ( 1 ) - 트롤 전개판의 전개 간격 계측 시스템 -)

  • Shin, Hyeon-Ok;Lee, Chun-Woo
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.33 no.3
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    • pp.189-193
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    • 1997
  • We make an ultrasonic system as a trial to measure the distance between trawl doors, and carried out a water tank ($24{\times} 24$m, water depth 1 m) experiment for confirming the practical use of the system in October 1996. This system calculates the distance between the pinger (50 kHz) and the transponder (50 kHz/70 kHz) attached each one on the trawl door by measuring the time-difference of receiving with two channels receiver on the trawler. This paper assums that both the length of the warp from the stern to the trawl door is same. At results the system shows a good relation between the distance and the time-difference of receiving while the location of the pinger is moved in variously in the water tank, and it was found that the method of measuring techniques on the prototype system could be applied to the measurement of the trawl door opening in the field experiment.

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Development of Door Outer Panel using High Strength Steel Sheet for Improving Dent Resistance (내덴트성 향상을 위한 고강도 도어 외판 개발)

  • Kim, I.S.;Kim, T.J.;Jung, Y.I.;Yoon, C.S.;Lim, J.D.
    • Transactions of Materials Processing
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    • v.16 no.4 s.94
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    • pp.254-259
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    • 2007
  • Dent resistance is an important characteristic to avoid damage on automotive outer panels. From a practical point of view, dents can be caused in a number of ways. Considering doors as an example, denting can occur from stone impacts or from the careless opening of an adjacently parked vehicle door. Denting can occur where the door surface is smooth and may not have sufficient curvature to resist dent. These exterior body parts are designed to improve dent resistance using a combination of work hardening and bake hardening. In brief, dent is affected by the shape of the parts and the material properties such as yield strength, strain and thickness. In this work, forming of door outer panel is investigated by Taguchi method. Main parameters are yield strength, thickness, blank size, blank holding force and so on. For the given value of design parameters, forming analysis of the eighteen cases are carried out according to L18 orthogonal array. After comparing the performance by simple conversion of simulation results into dent resistance, the final suggestion of the forming parameters is verified for the optimal improvement of dent resistance.

Welding Distortion Characteristics of Door Openings According to Changing Shape of Stiffener (Door Opening부의 보강재 형상변화에 따른 용접 변형 특성)

  • Lee, Dong-Hun;Seo, Jung-Kwan;Yi, Myung-Su;Hyun, Chung-Min
    • Journal of Ocean Engineering and Technology
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    • v.33 no.2
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    • pp.153-160
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    • 2019
  • Welding often results in welding distortion during the assembly process. The welding distortion of thin-plate structures such as the living quarters of ships and offshore installations is a more significant problem than in the case of thick-plate structures. Pre-stressing/heating and fairing, which are additional works to mitigate and control welding distortion, are inevitable, and the construction planning is accordingly delayed. In order to prevent welding distortion and minimize the additional work during the assembly process, increasing the plate thickness and/or the number of stiffeners may be a simple solution, but it may give rise to problems related to cost and weight. In this study, the welding distortion control effect of the type of stiffeners on the door openings of various living quarter structures was investigated using an experimental method and a finite element method. The results showed the feasibility of mitigating and controlling the welding distortion, and the optimum selection of the type of stiffeners was confirmed.

Pilot Case for Container Security Device (CSD) Based on Active RFID

  • Lee, Eun-Kyu;Moon, Young-Sik;Shin, Joong-Jo;Shon, Jung-Rock;Choi, Sung-Pill;Kim, Chae-Soo;Kim, Jae-Joong;Choi, Hyung-Rim
    • Journal of information and communication convergence engineering
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    • v.8 no.2
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    • pp.238-243
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    • 2010
  • CSD is Active RFID based Container Security Device which is proposed by the U.S Department of Home Security. It is mounted inside the container to sense opening of the container door. ConTracer is the CSD which is developed in this research whose major features are sensing door opening status as well as history inquiring on internal environment and shock to the container by mounting the temperature/ humidity/ shock sensors. Moreover, its RFID frequency bandwidth uses 433MHz and 2.4GHz to correspond actively to the frequency used by different countries. This paper introduces the development trend of CSD, compares the ConTracer which is developed thru this research and other company's CSD, and introduces CSD System which is designed and established using ConTracer. Finally, the implemented CSD System is verified by applying the demonstration service to container distribution between Korea and China.

A Study on the Improvement of the External User Services in University Libraries (대학도서관 외부이용자제도 개선방안에 관한 연구)

  • Jeong, Dae-Keun;SaKong, Bok-Hee
    • Journal of Korean Library and Information Science Society
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    • v.41 no.4
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    • pp.269-293
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    • 2010
  • Opening university library doors to the community is essential to meeting their demands and it is also the duty of university libraries. Since opening doors of university libraries have become more and more significant, this study analysed the conditions of the university libraries that have the open-door policy to external users and carried out an analysis of problems caused by the open-door policy. The following alternatives were suggested : the introduction of the membership system about the external users, the role division of university library and local public libraries, reinforcement of external library user education, and access management about external users.

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