• Title/Summary/Keyword: Housing design

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Development of a Kiln Dry Schedule for Lindera erythrocarpa Grown in Hongsung, Chungnam Province, Korea (충남 홍성지역에서 자란 비목나무(Lindera erythrocarpa)의 열기건조스케쥴 개발)

  • Kang, Chun-Won;Kang, Ho-Yang
    • Journal of the Korean Wood Science and Technology
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    • v.46 no.1
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    • pp.10-16
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    • 2018
  • Lindera erythrocarpa is a less utilized species in Korea although that it has straight stem and it grows up to 40 cm in diameter. A proper kiln-dry schedule is required in advance to utilize an unknown species. Terazwa's quick oven-dry method was used to find it and which was confirmed by drying 25 mm thick boards in a kiln. The average green moisture content and the average green specific gravity of Lindera erythrocarpa are 72.3% and 0.53, respectively. Prospective kiln-drying conditions obtained by Terazwa's quick oven-dry method are a initial dry-bulb temperature of $50^{\circ}C$, a initial wet-bulb depression of $4^{\circ}C$ and a final dry-bulb temperature of $75^{\circ}C$, which are in a good agreement with USDA FPL kiln-dry schedule of T5-D4. 25 mm thick boards dried in a kiln with T5-D4 kiln-dry schedule did not have any severe drying defects such as honycombing and warping. A severer kiln-dry schedule of T8-C5 was developed and applied to another kiln-drying run to confirm it.

A Weight Analysis for Measuring the Management Performance of Strategic Business Units of Large Construction Companies (대형건설기업의 경영성과 측정을 위한 전략사업본부 비중분석)

  • Lee, Dong-Hoon;Park, Hye-Sung;Kim, Jung-Chul;Kim, Sun-Kuk
    • Journal of the Korea Institute of Building Construction
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    • v.13 no.6
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    • pp.530-540
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    • 2013
  • The business environment that affects the management performance can be characterized by each Strategic Business Unit (SBU) since construction companies win overseas contracts due to the fairly good construction situations while experience a decline in the local housing market. Environmental changes can alter the strategic importance of the SBU when measuring the management performance. However, large construction companies apply BSC (Balanced Score Card) for collective calculation to determine the management performance, making it difficult to reflect the strategic importance of SBU. This method may create a distorted image of management performance that fails to take environmental changes into consideration, and as such it needs to be improved. Yet, there are no studies on the weight of each SBU considering environmental changes. Thus, the current study intends to analyze the weight of SBU for company-wide measurement of the performance of large construction companies. In addition, a model for analysis of SBU importance is proposed to respond to the constantly changing environmental situations and to modify the weight. For analysis of SBU weight, a questionnaire was conducted with 23 experts and hands-on workers, and the questionnaire result was quantitatively analyzed by applying the FD-AHP method. It is expected that the result will enable a model to be proposed to calculate the weight per division in a manner that reflects environmental changes and minimizes strategic distortion when measuring the management performance of large construction companies.

A Study on Design and Implementation of Low Noise Amplifier for Satellite Digital Audio Broadcasting Receiver (위성 DAB 수신을 위한 저잡음 증폭기의 설계 및 구현에 관한 연구)

  • Jeon, Joong-Sung;You, Jae-Hwan
    • Journal of Navigation and Port Research
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    • v.28 no.3
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    • pp.213-219
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    • 2004
  • In this paper, a LNA(Low Noise Amplifier) has been developed, which is operating at L-band i.e., 1452∼1492 MHz for satellite DAB(Digital Audio Brcadcasting) receiver. The LNA is designed to improve input and output reflection coefficient and VSWR(Voltage Standing Wave Ratio) by balanced amplifier. The LNA consists of low noise amplification stage and gain amplification stage, which make a using of GaAs FET ATF-10136 and VNA-25 respectively, and is fabricated by hybrid method. To supply most suitable voltage and current, active bias circuit is designed Active biasing offers the advantage that variations in $V_P$ and $I_{DSS}$ will not necessitate a change in either the source or drain resistor value for a given bias condition. The active bias network automatically sets $V_{gs}$ for the desired drain voltage and drain current. The LNA is fabricated on FR-4 substrate with RF circuit and bias circuit, and integrated in aluminum housing. As a reults, the characteristics of the LNA implemented more than 32 dB in gain. 0.2 dB in gain flatness. lower than 0.95 dB in noise figure, 1.28 and 1.43 each input and output VSWR, and -13 dBm in $P_{1dB}$.

Development and Evaluation of the Cohousing Teaching.Learning plan (가정과 주생활 교육을 위한 코하우징 교수.학습 과정안 개발 및 평가)

  • Kim, Mi-Hyang;Cho, Jae-Soon
    • Journal of Korean Home Economics Education Association
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    • v.23 no.2
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    • pp.55-69
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    • 2011
  • This study aims at developing and evaluating the cohousing teaching/learning plan for middle and high school. The plan was developed into 5 stages such as data collection and analysis, design, development, implement, and evaluation_ It was composed of 3 lessons with various teaching materials; the concept and necessity of cohousing, spatial composition, and making a cohousing village as the main theme. The 3 home economics teachers carried out the plan for 28 classrooms (1125 students) in 2 middle and I high school, during 23th, Aug., to 17th, Sep. 2010 in Kyunggido. The high level of understanding, learning processes, interest, satisfaction with the class reported by the students showed that the plan might be adequate to both high and middle school students. The teachers carried the lessons reported the similar positive responses to the plan with some suggestions to increase teaching hours, prepare class appliances, and prepractice the teaching materials.

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Design and Fabrication of APD-FET Module for 2.5 Gbps Optical Communicating System (광통신용 APD-FET 광수신모듈 설계 및 제작)

  • 강승구;송민규;윤형진;박경현;박찬용;박형무;윤태열;이창희;심창섭
    • Korean Journal of Optics and Photonics
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    • v.5 no.1
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    • pp.166-172
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    • 1994
  • The fiber optic receiver, ETRI APD-FET 1.0, is developed for the application of optical communication. This fiber optic receiver includes PD sub-module and pre-amplifier case. A single lens system is introduced for the PD sub-module. The sub-module consists of the avalenche photodiode(APD), GRIN rod lens, and a single mode fiber. The above components are enclosed into the stainless steel 304L housings. By bevelling the fiber end, the single mode fiber provides less than ~ 28 dB of optical return loss. The area of image focus is controlled by adjusting the length of spacer located in-between the fiber and the GRIN rod lens. The laser welding technique is applied to achieve the maximum coupling efficiency for the joining of each housing. In the pre-amplifier case, GaAs FET pre-amplifier workes for photocurrent amplification and the thermister is mounted to control the APD bias. The performance of ETRI APD-FET1.0 shows the sensitivity of - 30.3 dBm at $10^{-10}$ BER(bit error rate) and 2.5 Gbps optical random signal of $2^{23}-1$ word length. The fiber optic receiver is one of the essensial parts of the transmission module for B-ISDN. Also, the above optical packaging technology will be adapted for the developement of 10 Gbps transmission application 2.5 Gbps 5 Gbps

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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.

A Study on the Parking Space and Space of Detached Housing Area in Misagangbyeon-City (미사강변도시 단독주택지의 주차공간과 가구의 특성에 관한 연구)

  • Hwang, Yong-Woon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.10
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    • pp.785-793
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    • 2017
  • The guidelines for the district unit planning(DUP) of detached houses in the area of Misagangbyeon-City (MISA) do not consider the characteristics of the region. Therefore, this study was conducted to analyze the relationship between the blocks and parking lots of the detached houses area. The research results can be summarized as follows: 1) Detailed design guidelines are provided for apartment homes in MISA, but not for detached houses. 2) Apartment home and multi-family house parking lot equivaluation calculations exist in the DUP guidelines, however there are no regulations related to detached houses and the problem of parking for these residents is worsening which causes tension. 3) The DUP guidelines stipulate that the outer wall material of multi-family houses must be glass, however this is a dangerous material for use on the first floor, because cars that park close to this wall. 4) There is a significant risk to elementary and kindergarten students who must walk along the road in the inner blocks where cars are driving quickly. 5) There are a number of issues involved when planning parking lots without considering the characteristics of the area. The local government uses the traditional parking lot codes without considering the current regional characteristics, whereas the number of cars has dramatically increased. 6) The pedestrian mall is not currently being used for pedestrians, because it is full of parked cars due to the lack of parking space.

Greenhouse Design for Subtropical Plants in Apartment Housing Complexes in Temperate Regions (온대지역 공동주택단지의 아열대 식물용 온실 설계)

  • Kim, Jai-Sik;Kim, Jeong-Moon
    • Journal of the Korean Institute of Landscape Architecture
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    • v.36 no.6
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    • pp.34-42
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    • 2009
  • This study was executed to introduce a greenhouse style "Evergreen Park" to apartment complexes to target hands-on resident participation and application rather than a mere viewing of the plants as a way to provide convenient and profitable service to residents in a year-round center of usable outside space. The four key points can be summarized as follows: first, subtropical plants are evergreen broad-leaved trees, which maintain their green during all four seasons the leaves are thick and glossy. Greenhouses geared toward these subtropical trees-mainly broad-leaved evergreen species-are in planning to introduce these unique, elegant plants to temperate regions. Residentswill not only gain an education regarding these species but will be provided with the best quality evergreens at very reasonable maintenance costs. Second, subtropical plants greenhouses introduced in apartment complexes are suggested for structures connected via underground passage as well as free-standing structures so as to make use of geothermal heating and apply to reducing sunlighting. Third, as a way to provide (1) health & relaxation(evergreens, herb garden, water space), (2) community & education (plant flea market/plant hospital, plant-related lecture(exhibition), hands-on experience program), (3) a vine garden for year-round use such festivities as a Butterfly Festival, Aroma festival, Smile Oak Nuts, Candlelight Festival and Christmas Photo Site. Lastly, it has been suggested that the operation and maintenance of these greenhouses will be both by resident council operation management and by outsourcing company operation management.

A Study on the Ultra Small Size 25 Watt High Power Amplifier for Satellite Mobile Communications System at L-Band (L-band 위성통신 시스템을 위한 극소형 25 Watt 고출력증폭기에 관한 연구)

  • Jeon, Joong-Sung;Ye, Byeong-Duck;Kim, Dong-Il
    • Journal of Navigation and Port Research
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    • v.26 no.1
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    • pp.22-27
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    • 2002
  • The 25 Watt hybrid MIC SSPA has been developed in the frequency rang from 1.6265 GHz to 1.6465 GHz for uplink of INMARST's earth station. To simplify the fabrication process, the whole system is designed of two parts composed of a friving amplifier and a power amplifier. The Motorolas MRF-6401 is used for driving part, the Motorolas MRF-16006 and MRF-16030 is used the power amplifier. We reduced weight and volume of high power amplifier through arranging the bias circuits in the same housing. The realized SSPA has more than 30 dB for gain within 20 MHz bandwidth, and the voltage standing wave ratios(VSWR) of input and output port are less than 1.7, respectively. The output power of 44 dBm is achieved at the 1 dB gain compression point of 106365 GHz These results reveal a high power amplifier of 25 Watt which is the design target. The Proposed SSPA manufacture techniques in this paper can be applied to the implementation of high power amplifiers for some radars and SCPC.

Survey of Natives Resettlement Consciousness in Urban Regeneration Project -Centered on the Re-Maintenance Promotion District of Asan City- (도시재생사업 추진에 있어 원주민 재정착 의식조사 -아산시 재정비촉진지구를 중심으로-)

  • Koo, Si-On
    • The Journal of the Korea Contents Association
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    • v.10 no.4
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    • pp.282-291
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    • 2010
  • This study is carried out in order to suggest the effective method to enhance the resettlement of natives for re-maintenance promotion district of Asansi. This study is carried out through current status survey, native survey, and examining related laws, and the result of study is as follows. First, as a result of examining the intention of resettlement for the residents and merchants who live in the project district, 84% of residents and 80% of merchants wish to resettle. Second, in order to enhance the rate of resettlement, driving project to satisfy the demands of residents and merchants is needed. For this, house supplying policy and complex design technique for corresponding this tendency is needed because they prefer to live a single houses or housing attached to shopping street of 100 million won valued below as well as apartments,. And new types of business which can activate the function of the old city are needed, but making commercial space where current merchants can constantly do business activities is demanded. Third, the expansion of urban regeneration concept which have economics, society, culture, welfare and community as well as physical environment improvement are emphasized is needed. Fourth, the role of government for urban regeneration should be strengthened, and institutional improvement should be supported. Government needs to constantly support including financial supporting in order for the regeneration of regional city, and especially should scout for the policies which community can be maintained and should support first. For this, utilizing public lands inside project district into leading project, government should utilize into "constructing rental houses for natives", inducing the leading key facilities. Fifth, various plan techniques for the resettlement of natives of other advanced countries should be examined and be achieved.