• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.11
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• pp.89-96
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• 2016

The performance of anti-submarine sonar detection is required to improve by the development of submarine noise reduction technology. because of the need of an anti-submarine detection ability, known for superior beamforming performance, adaptive beamforming algorithms have been considered as an alternative beamforming algorithm of a conventional beamforming algorithm. In order to achieve improved performance by applying an adaptive beamforming algorithm to the sonar system, the adaptive beamforming algorithm applicability of system must be verified, To do this, the performance index for the system applicability must be established. In this paper, a tracking initiation probability of the adaptive beamforming algorithm and the conventional beamforming algorithm was calculated and the performance of both techniques was quantified, a system applicability of the adaptive beamforming algorithm was reviewed.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.5
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• pp.777-782
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• 2017

The Signal Intelligence (SIGINT) system based on the adaptive beamformer, comprised of the AOA estimator followed by the interference canceller, is a cutting edge technology for collecting various signal information utilizing all sorts of devices such as the radar and satellite. In this paper, we present the efficient adaptive SIGINT structure consisted of an AOA estimator and an adaptive beamformer. For estimating AOA information of various signals, we employ the Multiple Signal Classification (MUSIC) algorithm and for efficiently suppressing high-power interference signals, we employ the Minimum Variance Distortionless Response (MVDR) algorithm. Also, we provide computer simulation examples to verify the performance of the presented adaptive beamformer structure.

• Membrane Journal
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• v.21 no.4
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• pp.329-335
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• 2011

A new type of diagnostic membranes based on methoxyethoxy and trifluoroethoxy co-substituted polyphosphazene has been prepared to measure blood glucose level of diabetics. Final absorbances at 680 nm through activated polyphosphazene membranes were measured at various concentration of glucose in plasma or blood. The end-point results of varing absorbance values as time (K/S) was found to have a linear relationship toward the blood glucose concentration. The effects of substitution rates with hydrophilic groups and hydrophobic groups on the measurements of glucose concentration were studied. Dose-response slope (DRS) values between glucose concentration and K/S values increased as the hydrophilic substitution rates increased. However, in more than 30% of the substitution rates, it was difficult to measure exact concentration level of glucose because DRS increased rapidly.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.1
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• pp.386-395
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• 2014

Sexual satisfaction depends a lot of various factors. The study was conducted to understand middle-aged women's sexual function, sexual communication, and sexual satisfaction and to determine factors influencing sexual satisfaction. As a descriptive correlation study, data was collected during Oct. in 2012 to Jan. in 2013 from 126 middle-aged women in Korea. Sexual function, sexual communication, and sexual satisfaction were averaged 25.02 (range of score 2~36), 3.12 (out of 5), and 2.36 (out of 4), respectively. Sexual satisfaction had a positive correlation with sexual function and sexual communication. Sexual function, sexual communication, and last formal education were influencing factors on sexual satisfaction. Sexual satisfaction of middle-aged women was considered their physical and psychological aspects. Nurses should become aware of the wider consideration that need to be made in relation to the general and sexual quality of life when caring for middle-aged women.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.3
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• pp.9-14
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• 2020

In this paper, Qualification Model of frequency synthesizer is designed for X-band SAR system and performed electrical and environment test. Designed frequency synthesizer generate 13.65 GHz with very low phase noise performance. The integrated phase noise from 10Hz to 1MHz is -37.91 dBc. IRF performances are analyzed according to phase noise and jitter. Also, thermal and structure analysis are achieved for stable operation in space environment. Designed frequency synthesizer is consist of 2 modules of 6U size and generate L-band, C-band, Ku-band. The result of this study would enhance the design ability of RF module and help the frequency synthesizer design for SAR payload system.

• Membrane Journal
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• v.27 no.2
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• pp.138-146
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• 2017

The new types of phenoxy-carboxylatophenoxy cosubstituted polyphosphazene were synthesized with various substitution rates. Diabetic diagnostic membranes were prepapared with these types of polyphosphazenes and final absorbances at 680 nm through these membranes were measured at various concentrations of glucose in blood. Basically, the end-point results of varying absorbance values according to time (K/S) had a linear relationship to the glucose concentration. The effects of substitution rates with hydrophilic carboxylatophenoxy groups and hydrophobic phenoxy groups on the glucose concentration measurements were examined. It was very difficult to measure glucose concentration in less than 10% of the hydrophilic substitution rates, because the glucose penetration rate was too slow. But dose-response slope (DRS) values between glucose concentration and K/S values increased as the hydrophilic substitution rates increased in more than 10% of the hydrophilic substitution rates. However, in more than 30% of the hydrophilic substitution rates, DRS value was too rapidly increased, because glucose penetration rate was too fast.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.10 no.5
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• pp.786-795
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• 1999

To detect the precise of arrival of target signal in real ocean environments, Inverse beamformnig(IBF) solutions to the Inverse beamforming integral equation are surveyed theoretically and the performance properties of the IBF are analyzed with simulations. IBF-Cardioid beamforming algorithm is proposed for port/starboard discrimination and the performance gains are studied with simulations. It is shown that IBF has a 3 dB array noise gain advantage over CBF under ideal conditions. This 3 dB array noise gain advantage is proven by theocratical studies and simulations. This array noise gain advantage leads to a minimum detectable level advantage for IBF output compared with CBF output. The fact that the IBF beamwidth is narrower than the CBF beamwidth by a factor of 0.68 proves the performance of detection and spatial resolution improvement. Comparing the simulation results of IBF-Cardioid beamforming and Conventional Cardioid beamforming, it is shown that IBF-Cardioid beamformer have performance enhancement in minimum detection level, detection accuracy and resolution.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.2
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• pp.311-320
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• 2019

This study is a descriptive study to investigate the relationship between sexual function, sleep quality, and depression in male cirrhosis patients. Data were collected from a structured questionnaire from August 16, 2017 to January 30, 2018. Data were collected by t-test, ANOVA, Scheffe test, Pearson correlation. AS a result, the lower the sexual function of male cirrhosis patients, the lower the quality of sleep (r=-.232, p =.005) and the higher the depression score (r=-.381, p<.001) The lower the score, the higher the score of depression (r=.561, p<.001). Sexual function, quality of sleep and depression were found to be statistically significant. The results of this study can be used as basic data for the development of nursing intervention for male cirrhosis patients.

• Proceedings of the KIEE Conference
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• 2008.09a
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• pp.64-66
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• 2008

현재 전압변성기는 기존의 철심형 전압변성기에서 전자식전압변성기로 변화하고 있으며, 전자식 전압변성기의 비오차와 위상각 오차를 정확하게 평가하는 것은 전자식 전압변성기의 보급에 중요하다. 표준전압변성기 두 대와 전압변성기 비교기를 이용하여 22 kV급 전자식 전압변성기의 비오차와 위상각 오차를 평가할 수 있는 시스템을 구축하였으며, 시스템의 불확도를 분석하였다.

• The Monthly Diabetes
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• s.209
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• pp.16-18
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• 2007

5년 전부터 경구혈당강하제를 먹고 있는 56세 남자로 발기부전을 주소로 비뇨기과 외래를 방문했다. 약 3$\sim$4년 전부터 성기의 강직도가 좀 떨어졌지만, 부부관계를 끝까지 할 수는 있었는데, 최근 1년 전부터는 관계 도중에 사정을 하지도 않았는데 발기가 소실되어 버리는 경우가 생겨 당황하게 되기도 하였다. 급기야는 발기가 제대로 되지 않아 부부관계를 전혀할 수가 없어서 몇 번 시도 하다가 실패한 후로는 시도조차하지 않고 지내고 있다고 한다. 정력에 좋다는 건강보조식품을 먹어도 별로 도움이 되지 않는 것 같아서, 친구에게서 얻은 비아그라를 한알 먹어 보았는데, 효과를 보지는 못했다고 한다. 간혹 새벽발기도 되는 때가 있고, 이전 같지는 않지만 마음이 동할때도 있지만, 몇 번의 좌절을 겪은 후라 선뜻 시도하기가 두렵다고 하였다. 성기능을 평가하는 설문인 국제발기능지수로 보았을 때 11점으로 중등도의 발기부전이었고, 기본적인 혈액검사와 남성호르몬 수치는 정상이었다. 위와 같은 경우가 당뇨병에 의한 발기부전의 가장 흔한 예 중 하나인데, 대개 발기력의 약화가 서서히 진행되고, 성관계의 실패로 몇 번 당황한 후로는 의기소침 해져서 잠자리를 멀리하게 된다. 남성호르몬 수치가 정상이고 새벽발기도 간혹 되므로 경구용 발기부전 치료제가 우선적으로 선택될 수 있다. 이전에 친구에게서 얻어 먹은 비아그라는 약이 진짜인지 가짜인지가 불분명 하고, 무엇보다 복용법을 정확히 지키지 않아서 효과가 없을 수 있다.