• 한국정밀공학회지
• /
• 제29권10호
• /
• pp.1110-1118
• /
• 2012

In this study, for reducing the residual vibration in high speed motion control stage, an improved 5th order polynomial motion profile was developed. When a stage is moving, the current through the motor coils has the same profile of input motion profile of acceleration, therefore the characteristics of the acceleration input profile directly affect on the performance of the amplifier that includes the current control loop. Commonly low cost amplifier and motor has a narrow current control bandwidth, therefore the proposed algorithm was designed based on this practical constraint. Simulation and experimental results showed that the proposed algorithm clearly has low residual vibration characteristics than conventional 5th order polynomial motion profile on the same drive condition.

• 방송공학회논문지
• /
• 제23권6호
• /
• pp.925-930
• /
• 2018

본 논문에서는 분리된 4-조각 매쉬형 반사판을 갖는 소형 이중 4-배열 미앤더 모노폴 안테나를 제안한다. 십자형 요소와 4-소각 매쉬형 반사판은 복사패턴 특성과 안테나 이득 개선에 기여했다. 제안된 안테나의 실험치는, 다이폴과 같은 복사패턴 특성을 보였다. 제작된 안테나의 최대 이득 실험치는 약 2.89dBi 로 나타났으며, 이것은 소형 안테나에서는 비교적 높은 이득 특성을 나타낸 것이다. 이 안테나는 이동통신 RFID 리더용, 의료용기기, 방송용, 홈네트워킹, 그리고 다른 소형 고이득 시스템에 응용될 수 있다.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2002년도 전력전자학술대회 논문집
• /
• pp.476-479
• /
• 2002

The proposed DC/DC converter employs a pair of neighboring printed-circuit-board windings as a coreless transformer Thus, the proposed DC/DC converter can be fabricated In an ultra low-profile fashion. The performance of the proposed low-profile DC/DC converter is confirmed with experiments on a prototype converter that delivers 58W of power at the maximum efficiency of $84\%$.

• Journal of electromagnetic engineering and science
• /
• 제15권4호
• /
• pp.245-249
• /
• 2015

In this paper, a low-profile dipole array antenna with monopole-like radiation for on-body communications is proposed. The proposed antenna, operating in the industrial, scientific, and medical (ISM) band, is designed with consideration of the human body effect. By placing eight planar dipole antenna elements symmetrically around the z-axis, the proposed antenna achieves monopole-like radiation characteristics with a low profile. The antenna has overall dimensions of $0.44{\lambda}_0{\times}0.44{\lambda}_0{\times}0.013{\lambda}_0$ at 2.45 GHz in the ISM 2.45 GHz band (2.4-2.485 GHz) and a 10-dB return loss bandwidth of 4.9% ranging from 2.4 to 2.52 GHz.

• 한국수학교육학회지시리즈D:수학교육연구
• /
• 제26권3호
• /
• pp.235-252
• /
• 2023

We investigated the classification of learner groups for students' mathematical modeling competency and analyzed the characteristics in each profile group for each country and variable using PISA 2012 data from six countries. With a perspective on measuring sub-competency, we applied the latent profile analysis method to student achievement for mathematical modeling variables - Formulate, Employ, Interpret. The findings showed the presence of 4-6 profile groups, with the variables exhibiting high and low achievement within each profile group varying by country, and a hierarchical structure was observed in the profile group distribution in all countries, interestingly, the Formulate variable showed the largest difference between high-achieving and low-achieving profile groups. These results have significant implications. Comparison by country, variable, and profile group can provide valuable insights into understanding the various characteristics of students' mathematical modeling competency. The Formulate variable could serve as the most suitable predictor of a student's profile group and the score range of other variables. We suggest further studies to gain more detailed insights into mathematical modeling competency with different cultural contexts.

• 동의신경정신과학회지
• /
• 제33권3호
• /
• pp.259-266
• /
• 2022

Objectives: The combination of Harm-Avoidance (HA) and Self-Directedness (SD) of Temperament and Character Inventory (TCI) has been reported pivotal for mental health; however its clinical usefulness in integrative medicine has not sufficiently reported. The purpose of this study was to illustrate multi-phasic mental health of subjective satisfaction with life, emotional well-being, and psychopathology, following the HA-SD profile groups. Methods: A total of 527 Korean university students reported HA and SD scores as to render their HA-SD profile, and multi-phasic mental health characteristics using Satisfaction with Life Scale (SWLS), Positive Affect and Negative Affect Schedule (PANAS), and Beck Depression Inventory (BDI) with composite well-being scales of SC (Sum of Self-Directedness and Cooperativeness score) and HI (Happiness Index, subtraction of Negative Affect (NA) score from Positive Affect (PA) score) as standardized. Pearson's correlation was used to report correlation coefficient, and the ANCOVA with age and sex as covariates, to show significant differences in mental health and well-being between the HA-SD profile groups. Results: The HA-SD profile groups showed distinctive multi-phasic mental health characteristics; health related scores of SWLS, PA, SC and HI decreased following the order of hS (low HA and high SD), HS (high HA and high SD), hs (low HA and low SD) and Hs (high HA and low SD) profile groups; however the non-health related scores of NA and BDI showed contrasting order. Conclusions: The HA-SD profile was found to be clinically useful for examining multi-phasic mental health and well-being status, and the TCI may be an imperative personality inventory for integrative medicine.

• Journal of Power Electronics
• /
• 제6권1호
• /
• pp.83-93
• /
• 2006

A new high efficiency and low profile on-board DC/DC converter for digital car audio amplifiers is proposed. The proposed converter shows low conduction loss due to the low voltage stress of the secondary diodes, a lack of DC magnetizing current for the transformer, and a lack of stored energy in the transformer. Moreover, since the primary MOSFETs are turned-on under zero-voltage-switching (ZVS) conditions and the secondary diodes are turned-off under zero-current-switching (ZCS) conditions, the proposed converter has minimized switching losses. In addition, the input filter can be minimized due to a continuous input current, and an output inductor is absent in the proposed converter. Therefore, the proposed converter has the desired features, high efficiency and low profile, for a viable power supply for digital car audio amplifiers. A 60W industrial sample of the proposed converter has been implemented for digital car audio amplifiers with a measured efficiency of $88.3\%$ at nominal input voltage.

• 한국식품영양과학회지
• /
• 제21권6호
• /
• pp.681-685
• /
• 1992

돼지고기에서 분리한 bacteriocin 생성능이 우수한 젖산균을 동정하기 위하여 이미 알려진 몇가지 젖산균을 참고균으로 하여 10% denaturing polyacrylamide gel에 전기영동으로 전개한 5S rRNA 와 tRNA 등 150개 이하의 핵산으로 구성된 저분자량 RNA(Low Molecular Weight RNA : LMW RNA) profiles에 나타난 15~25개의 밴드 양상이 균에 따라 차이점을 보여 동정에 효과적으로 이용할 수 있었다. 새로 분리한 젖산균은 참고균과는 다른 균종이었다. APT, TSB, MRS의 3종류 다른 배지에서 배양하여도 LMW RNA profiles에는 차이가 없었으며, 겔상의 밴드 전개거리를 3개의 표준 분자량 물질을 이용하여 만든 표준곡선을 사용하여 상대핵산단위(relative nucleotide units : RNU)로 나타낸 밴드의 양상을 도표화 하는 것이 profiles를 서로 비교 하는데 편리하였다.

• 전자공학회논문지A
• /
• 제28A권9호
• /
• pp.708-714
• /
• 1991

In this paper, the noise contribution to the permit tivity profile reconstructed by the spectral inverse scattering scheme is investigated and a low-pass filter is proposed to reduce such the noise effects. Numerical simulations showed that the reconstructed profiles are affected by extremely large error. The suggested low-pass filter made it possible to reconstruct the permittivity profile nearly similar to the original. Furthermore, the optimal condition to the low-pass filter agreed well with the physical meaning even if several variables involved in the inverse scattering scheme were changed.

• 대한감각통합치료학회지
• /
• 제10권2호
• /
• pp.1-9
• /
• 2012

목적 : 감각처리기능은 지각 및 인지기능 뿐만 아니라 작업수행을 위해서 가장 기본적으로 요구되는 능력이다. 아동의 경우 감각처리 문제로 인해 두드러지는 기능장애를 나타내지만 성인의 경우 살아가면서 감각에 적응하거나 그냥 무시한 채 지내기 때문에 흔히 감각처리기능을 간과하게 된다. 하지만 감각에 대한 생리적 특질은 변하지 않는 것이며 외부로부터 들어오는 불편한 감각자극으로 인해 우리는 무의식적으로 영향을 받고 있기 때문에 이를 조절하기 위해 본인의 감각처리특성을 파악하는 것이 무엇보다 중요하다. Adolescent/Adult Sensory Profile은 일상생활에 기반을 둔 감각처리기능을 설문형식으로 평가한다. 하지만 이런 설문형식의 평가는 응답자의 주관이나 그 외 다양한 요인들로 인해 결과의 타당도가 낮은 편이다. 따라서 본 연구는 Adolescent/Adult Sensory Profile의 촉각 처리영역 점수와 촉각탐지과제를 통해 측정한 촉각역치간의 상관관계를 알아봄으로써 이 평가도구의 일부 영역 (촉각 처리영역)의 타당도를 검증하고자 한다. 연구방법 : 본 연구에서는 Adolescent/Adult Sensory Profile의 촉각처리영역의 네 가지 항목(저등록, 감각민감, 감각추구, 감각회피)의 점수를 촉각탐지과제를 통해 얻어진 개인의 촉각역치 값과 비교하여 상관분석을 실시하였다. 연구결과 : Adolescent/Adult Sensory Profile의 촉각처리영역 중 저등록 및 감각추구 항목은 촉각역치 값과 양의 상관관계를 보였으며, 반면 감각민감 및 감각회피 항목의 경우 촉각역치 값과 음의 상관관계를 나타냈다. 특히나 촉각의 역치가 높을수록 저등록 항목의 점수가 높게 나타났으며 통계적으로 유의미하였다. 결론 : 촉각의 촉각역치가 높을수록 감각등록이 적으며 Adolescent/Adult Sensory Profile의 촉각처리영역의 저등록 관련된 설문문항이 촉각탐지과제를 통한 촉각역치 측정값과 상관관계가 높은 것으로 나타나 설문문항의 타당도가 높음을 보여주었다.