• 한국위성정보통신학회논문지
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• 제12권2호
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• pp.83-88
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• 2017

본 논문에서는 저고도각 고이득 특성을 이용한 3 소자 CRPA 배열 안테나 설계를 제안하였다. 제안된 안테나는 급전패치와 방사패치로 구성되어 있으며, 급전패치에 동축케이블을 통해 급전부가 직접 연결되고 방사패치에 전자기적으로 간접급전되어 저고도각 이득 특성이 개선되는 구조를 가진다. 제안된 배열안테나의 성능 측정을 전파무반사실에서 수행하였으며, 전면 방향 이득은 2.8 dBic, 축비 특성은 2.7 dB, $75^{\circ}$의 저고도각 평균 이득이 -1.4 dBic를 나타내어 항재밍 성능을 갖는 CRPA 안테나로 적합함을 확인하였다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제27권3호
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• pp.71-78
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• 2021

Purpose: It is important to plan the ward module at a time when the size of beds, the floor area, and the construction budget are all set prior to the hospital design. In this context this study aims (1) to derive various factors affecting the ward module, and (2) to analyze the appropriate room module according to the type. Methods: Design factors related to hospital modules are derived through precedential studies, and the types of ward elevation are classified by reviewing the drawings of 18 case hospitals. And the detailed dimensions and area of the derived elements are analyzed. Results: The X-axis modules of the ward are switched to long span structural columns of 9.9 m, 12.6 m and 13.2 m, but the ward modules still represent 6.6 m. The Y-axis module of the ward shows a dimension of 9 to 9.9m in the process of changing a multi-person room into a four-person room. Type A of curtain wall with columns located on the wall of the room and type B of curtain wall located in the center of the room are analyzed due to their variations. The square window type, which forms the elevation of the square window by exposing the columns to the elevation, and the outframe type, which protrudes from the structural columns and beams, have elevation designs limited. There are, however, no obstacles to the interior space of the hospital room, so the wall composition and furniture arrangement are expected to be free. The ward area of Curtain Wall Type A, which can secure an effective area of 5.9m*5.0m, are 52.1m². The Curtain Wall Type A, Square window type, and the outframe type are 49.8m². Implications: As part of the hospital standard module plan for economical and reasonable hospital building planning, a type was proposed in this study in conjunction with the external design. It is hoped that it be a base for standard module research linked together to the Central Treatment department, Outpatient department and underground parking lot.

• Journal of Positioning, Navigation, and Timing
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• 제12권2호
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• pp.101-111
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• 2023

Many spoofing detection studies have been conducted to cope with the most difficult types of deception among various disturbances of GPS, such as jamming, spoofing, and meaconing. In this paper, we propose a spoofing detection scheme based on elevation masked-relative received power between GPS L1 and L2 signals in a system using a multi-band array antenna. The proposed scheme focuses on enabling spoofing to be normally detected and minimizes the possibility of false detection in an environment where false alarms may occur due to pattern distortion among elements of an array antenna. The pattern distortion weakens the GPS signal strength at low elevation. It becomes confusing to detect a spoofing signal based on the relative power difference between GPS L1 and L2, especially when GPS L2 has weak signal strength. We propose design parameters for the relative power threshold including beamforming gain, the minimum received power difference between L1 and L2, and the patch antenna gain difference between L1 and L2. In addition, in order to eliminate the weak signal strength of GPS L2 in the spoofing detection process, we propose a rotation matrix that sets the elevation mask based on platform coordinates. Array antennas generally do not have high usefulness in commercial areas where receivers are operated alone, but are considered essential in military areas where GPS receivers are used together with signal processing for beamforming in the direction of GPS satellites. Through laboratory and live sky tests using the device under test, the proposed scheme with an elevation mask detects spoofing signals well and reduces the probability of false detection relative to that without the elevation mask.

• 전자공학회논문지A
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• 제32A권10호
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• pp.64-72
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• 1995

In this paper, atmospheric turbulence and absorption under clear weather condition, which affect the optical satellite up-link communication between geo-satellites and earth station, were studied. In case of the up-link communication, the received optical power is weakened by pointing loss caused by beam tilt which is the main effect of turbulent atmosphere. This pointing loss directly has relation to the diameter of optical transmitting antenna. From the inverse proportion of the pointing and spaced loss, it is the regions where the diameter of transmitting antenna increases abruptly and the efficient design of transmitting antenna is impossible. In case of using channel coding, it was shown that the peak value of diameter moved to the lower regions of elevation angle with increasing the coding gain and its width was also decreased. In case of considering both coding gain and transmission rate on the design of transmitting antenna, it was known that more coding gain was necessary as transmission rate was increased.

• International Journal of Advanced Culture Technology
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• 제9권1호
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• pp.22-27
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• 2021

Morphology of contemporary city streets is composed of overlapping infrastructures corresponding to the new street within the established organization, contemporary system, future circumstance, and population. As well, two overlaid organizations and morphological, historical, social and physical development lead to sharp acute algle(triangular) site, and the architecture in this site has a restriction on the availability of the internal space and the external design due to outside shape sharpness. We want to have a positive effect on the internal and external design of the architecture in the future by categorization of the shape and processing characteristics of the acute angle corner of the trilateral site. The characteristics and design categorization shown in this case study are as follows. Constitution a unique and independent form, lead streets and shape a exclusive image of the landscape, alleviate sharpness by configuring a acute angle point as a plane, use void to give reserve character, replace roundness for companionability to induce ambience in the road, embrace the characteristics of the site and create internal spaces and functions, emphasize the characteristics of each stairs, retain of uniqueness and highlight the characteristics of a vertical elements.

• 전자공학회논문지
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• 제54권3호
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• pp.15-21
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• 2017

능동 소나시스템에서 수신 신호의 해상도를 높이기 위한 방법은 다양하게 연구되어 왔다. 본 논문에서는 착저 물체의 탐지 해상도를 높이기 위한 방법으로 소나의 평면 배열 (planar array) 설계를 수행하였다. 해상력이 높은 좁은 형태의 빔 패턴을 얻기 위해서는 평면 형태의 어레이를 고려하는 것이 필요하다. 어레이를 구성하는 개별 음향 트랜스듀서의 송신 주파수는 13 kHz를 사용하였다. 비대칭 크기를 갖는 목표물의 효율적인 탐지를 위해 어레이 디자인에서 방위각(azimuth angle)과 고도각(elevation angle)에 따른 해상도를 동시에 고려하기 위해 areal angle 개념을 사용하였다. 그에 따라 목표 해상도를 만족하는 areal angle을 먼저 구하고 이를 역산하여 각각 목표 방위각과 고도각을 계산하여 어레이의 설계를 진행하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1990년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 26-27 Oct. 1990
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• pp.643-647
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• 1990

Gunner primary sight(GPS) stabilization system lays line of sight(LOS) to find out a target and transmits informations to the fire control system (FCS). In a moving vehicle, accuracy of LOS and FCS depends on the design of GPS and servomechanism system. The heavy vibration of vehicle on the severe off-road environment degenerates the stabilization capability of GPS. In this study, to stabilize of elevation for GPS using the variable structure control, we derived the dynamic equation of GPS system and designed the variable structure controller. Computer simulation results fulfilled the static and dynamic stability of GPS using the variable structure control.

• 한국산학기술학회논문지
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• 제16권11호
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• pp.7745-7753
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• 2015

텔레비전의 가스 스프링은 롱 스트로크 (200 ~ 300mm, TV 상승 변위) 하에서 작동 할 때 피스톤 속도의 제어가 가능하다. 이 원리에 의해서 사용자는 높낮이 조절이 가능하다. 먼저 피스톤의 흐름 해석을 수행하였다. 정확한 관형 단면을 위한 피스톤 속도 조절기술을 조사하였다. 유동률 제어 및 높낮이 작용을 위한 피스톤 구조를 제안되었다. 본 연구는 대형 텔레비전 스탠드를 통해 50 인치 이상 TV의 가스 스프링의 개발을 위한 것이다. 최적 피스톤 로드 제어를 위한 중공축(외경 19.9mm, 내경 13.9mm)에 질소 개스(0.3m/s)를 주입하였다. 그 결과, 유동율이 증대함에 따라 피스톤 로드의 압력강하는 외력의 변화 없이 증대되었다. 결과적으로, 가스스프링을 통한 변위의 제어는 가능하다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2014년도 추계 학술논문 발표대회
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• pp.207-208
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• 2014

The construction of economic, efficient and stable process has been a major challenge as the building are getting high-rise and biger. Low-rise buildings widely have been used Euro-form in the past. Recently, we are mainly using Al-form which can respond to chang in the various structures. we should be used in combination with Al-form and Gang-form to ensure the quality and construction process, according to the change of various elevations. Recently construction project is reguired diversification of elevation. And we apply the open balcony on the general architecture as well as public housing. Accordingly, Al-form & Gang-form has been applied the change of elevation, We further apply design and construction as proposal of issues and alternatives.

• 산경연구논집
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• 제14권10호
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• pp.35-43
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• 2023

Purpose: The purpose of this study is to analyze the structural relationship between the possibility of socioeconomic class elevation of wage earners, happiness and organizational commitment, and life satisfaction. Research design, data and methodology: Data from the 24th fiscal year (2021) of the Korea Labor Panel data were used for analysis. Only wage earners who measured job satisfaction and organizational engagement were analyzed, and a sample of 9,138 respondents was finally used, excluding missing values. Structural Equation Modeling was performed using AMOS 23.0, and Maximum Likelihood Estimation (MLE) was used as a model estimation method. Results: First, the hypothetical structural model set up for the study was found to be suitable. Second, the Possibility of Socioeconomic Class Elevation of wage earners, happiness, and organizational commitment were found to have a direct impact on life satisfaction. Third, the possibility of improving the socio-economic status of wage earners affects life satisfaction, and happiness and organizational commitment appear to have a partially mediating effect. Conclusions: This study is significant in that it has increased interest in organizational participation and life satisfaction, which were not covered in previous studies on the possibility of wage workers moving up the socioeconomic class.