• 한국정보통신학회논문지
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• 제13권4호
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• pp.629-635
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• 2009

본 논문에서는 하나의 국부 발진기를 갖는 FSK 이중통신 방식의 원격제어 무선 전송부를 설계 제작한다. 전 이중 방식의 FSK 양방향 동시통신 회로에서는 양방향 동시 통신을 위한 송수신 주파수를 설정하고, 반 이중방식에서는 송수신 신호를 발생하는 절체형 발진기 회로를 설계한다. 양 FSK 이중통신 방식의 원격제어 무선 전송부는 채널주파수간 간섭을 배제하기 위한 채널 사용 검지 및 자동 채널 설정 회로를 설계 구현하였으며, 400MHz 대역에서 50kHz 채널 간격을 갖는 위상동기 회로 구성의 Colpitz 형 국부발진주파수 회로와 10mW 이내의 소형 소출력 특성을 갖는다. 전 이중 방식의 송수신 주파수는 21.4MHz IF주파수의 2배 주파수인 42.8MHz주파수 간격으로 설계 구현하였다.

• 한국실내디자인학회논문집
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• 제23권4호
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• pp.248-256
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• 2014

According to data from the national office of Statistics Korea and Ministry of Health and Welfare, as the elderly population increases, the dementia elderly population continues to increase and its future population growth rate is expected to be even faster. In particular, the Dementia Management Act has been in effect since February 2012, and active efforts has been made for a policy for the dementia management. The purpose of this study is to establish standards on building plans based on the appropriate scale and spatial configuration on facilities planning for the elderly with dementia. Specifically, the basic data were collected with a request for a total of 103 points on the basis of a database of group homes in the survey managed by the Japan Association of Group Homes. Specific information of the research includes the management body of facilities operation, scale of the facilities, number of units and configuration of personal living space, and the collected survey data and drawings were statistically proceed and analyzed using the SPSS WIN 20.0. analysis results are summarized as follows. first, most of the group homes come to the small size of the 1-2 story home ; the approximate number of units is one or two per home, and each unit consists of nine rooms. second, a number of group homes with the building area of $300m^2$ have the U-shaped arrangement which is advantageous in the extension and facilities maintenance. In conclusion, this study is to be the fundamental data for judgments that can be used to establish standards for the facilities for the dementia elderly whose population continues to increase. In addition, further study is necessary to establish suitable design conditions of our country.

• 한국실내디자인학회논문집
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• 제18권6호
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• pp.202-210
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• 2009

This research was undertaken to prove the relationship between street mall activation and architectural plan design. The research methodology was established based on the analysis of data of two existing street malls in Korea (Western Dome & LaFesta) and theoretical studies of outdoor space design. The findings from this study are the following: First, building blocks with segments in every 50m or so are ideal for detailed communication between visitors and building contents. Second, the ratio of width of main corridor and building height should be less than 1 to provide intimate feel and keep visitors' attention concentrated in the facility. Third, store unit should have more storefronts to be exposed more to passers-by and lead more pedestrian traffic. Fourth, shape of store unit would rather be wide and shallow, instead of narrow and deep, to have more exposure to the central corridor. Fifth, the building block of the busiest(most expensive) area that is usually at the main entrance area of street mall should be flexible to fit more smaller units to maximize the profitability. Sixth, the main entrance of store should face the main pedestrian corridor to induce the influx of visitors. Lastly seventh, anchor tenant that has strong name recognition is usually located on basement or higher level to induce pedestrian traffic into the mall, key tenants that are strong and familiar brand names should be located at the corner of building block with spacing to attract visitors, provide even distribution of traffic, and support wayfinding, and local tenant should be located at small units along the central corridor or remainder spaces occurred from building core layout.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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• pp.667-670
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• 2007

A new series of highly bright and efficient poly(pphenylenevinylene) s (PPV)s based on polyhedral oligomeric silsesquioxanes (POSSs) was synthesized via the Gilch polymerization method. The three POSScontaining PPVs are as follows: POSS05- PPV(containing 5 mol % POSS-appended PPV units), POSS25-PPV(containing 25 mol % POSS-appended PPV units), and POSS100-PPV(containing 100 mol % POSS-appended PPV units; this is the first ${\pi}-conjugated$ polymer composed of 100 mol % POSSsappended repeating units). The POSS-containing PPVs exhibit higher glass transition temperatures $(64-77^{\circ}C)$ than that of MEH-PPV $(58^{\circ}C)$, indicating that electroluminescence (EL) devices fabricated with these polymers should have good thermal stabilities. Light-emitting diodes (LEDs) with the configuration of ITO/PEDOT:PSS/polymer/Ca/Al were fabricated using the novel POSS-containing PPVs. Surprisingly, the luminescence efficiency (0.48 cd/A at $10540\;cd/m^2$) of the binary blend consisting 5 wt % of POSS25-PPV and 95 wt % of MEH-PPV was found to be enhanced by a factor of 6.4 with a maximum brightness of $11010cd/m^2$ (at 14.3 V).

• International Journal of Aerospace System Engineering
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• 제9권2호
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• pp.1-9
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• 2022

The NEA release mechanism is used to provide restraint and release functions with low shock for critical deployment operations on solar arrays after launch. The GK3 solar array consists of 2 wings and 6 hold down points per panel. The NEA SSD9103S1 is a part of the GK3 solar array hold-down and release mechanism. Each NEA unit is equipped with two Z-diodes which provide power to a NEA unit connected in series after actuation of the fuse wire. This paper presents the hot firing test results of a quadrature NEA SSD9103S1 configuration. One output powers a maximum of 4 NEA SSD9103S1 units simultaneously. The necessary actuation pulse duration has been determined to meet margin requirement for thermal energy of minimum 4. Actuation thermal energy difference is about 6.6% between each half of two fired serial NEAs. Thermal energy margin at worst case is minimum 5.9 in case of an actuation pulse duration of 500 ms. Two series Zener impedance depend on current applied has been characterized by an additional actuation after all fuse wires are open circuit. Total number of actuation commands to the GK3 NEA unit reduce drastically from 24 in case of single NEA configuration down to 8 in case of parallel and quadrature NEA configurations. It can be accommodated by the existing HP2U Pyro design without any impact.

• 한국주거학회논문집
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• 제20권5호
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• pp.41-50
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• 2009

This case study is an effort to provide new knowledge on the U.S. elderly public housing focusing on the residents' perceptions of the environmental conditions. For this study, we conducted a survey using written questionnaires and interviews with 20 residents who rent in Columbia, MO. The recorded interview data was used for final analysis; primary findings are as follows: The residents reported relatively high satisfaction on their overall environmental conditions in the two target public housing, built in 1950s. As the most significant problem, residents perceive the lack of storage space for individual units, Partially attributed to space limitations. In addition, bathroom needs varied dramatically among residents based on their health and whether wheelchairs are used. Therefore, it was found that instead of standardized bathrooms, a customizable configuration for the resident's unique physical condition and accessibility must be considered. The residents also addressed their concerns about security for entrance and foyer areas. Due to the small living areas, they wanted to have available outdoor public space for various social activities. Furthermore, they reported the need for small social gathering areas while friends and family members are visiting them, in addition to their small living units, which average 49.8 sq. ft. each.

• 한국정밀공학회지
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• 제34권2호
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• pp.133-138
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• 2017

Inverter-Type refrigerators are known to consume less energy by varying the inverter frequency according to indoor temperatures and refrigerant pressure through indoor-outdoor communication. However, many commercial operators cannot afford to replace indoor units with ones capable of communication. In a non-communication configuration, indoor units are connected with an inverter-type outdoor unit without intercommunication abilities. The research goal is finding appropriate operating parameters to achieve energy efficiency. Thus, an operation algorithm with two modes is proposed, i.e., one to search the best operating parameters and one for normal operation with the best parameters. The experimental evaluation showed 11.27% reduction in energy consumption, indicating a good applicability of the algorithm.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제27권3호
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• pp.137-155
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• 2020

Redundancy is commonly employed to improve system reliability. In most situations, components in the standby configurations are assumed statistically similar but independent. In many realistic models, all parts in standby are not treated as identical as they have different failure possibilities. The operational structure of the system has subsystem-1 with five identical components working under 2-out-of-5: G; policy, and the subsystem-2 has two units and functioning under 1-out-of-2: G; policy. Failure rates of units of subsystems are constant and assumed to follow an exponential distribution. Computed results give a new aspect to the scientific community to adopt multi-dimension repair in the form of the copula.

• 한국문헌정보학회지
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• 제31권1호
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• pp.185-213
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• 1997

본 연구는 정보기술환경의 변화에 따라 대학의 정보관리조직구조를 CIO 조직체제로 변모해 온 과정과 새로운 CIO 조직구조 속에서 대학도서관과 컴퓨터센터의 상호협력관계를 구명하여 이를 국내대학에 적용시킬 수 있는 방안을 제시하였다. 주로 미국대학에서 활용하고 있는 다양한 CIO 조직 모형들의 특성과 이 모형에서 도서관과 컴퓨터센터와의 상호협력관계에 관한 실증적 분석이 이루어졌다.

• 말소리와 음성과학
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• 제13권1호
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• pp.45-51
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• 2021

End-to-end (E2E) automatic speech recognition (ASR) has achieved promising performance gains with the introduced self-attention network, Transformer. However, due to training time and the number of hyperparameters, finding the optimal hyperparameter set is computationally expensive. This paper investigates the impact of hyperparameters in the Transformer network to answer two questions: which hyperparameter plays a critical role in the task performance and training speed. The Transformer network for training has two encoder and decoder networks combined with Connectionist Temporal Classification (CTC). We have trained the model with Wall Street Journal (WSJ) SI-284 and tested on devl93 and eval92. Seventeen hyperparameters were selected from the ESPnet training configuration, and varying ranges of values were used for experiments. The result shows that "num blocks" and "linear units" hyperparameters in the encoder and decoder networks reduce Word Error Rate (WER) significantly. However, performance gain is more prominent when they are altered in the encoder network. Training duration also linearly increased as "num blocks" and "linear units" hyperparameters' values grow. Based on the experimental results, we collected the optimal values from each hyperparameter and reduced the WER up to 2.9/1.9 from dev93 and eval93 respectively.