• 방송공학회논문지
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• 제24권3호
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• pp.387-394
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• 2019

본 논문에서는 부가 정보를 이용하는 오토 인코더 기반의 새로운 오디오 고대역 부호화 방법을 제안한다. 제안하는 방법은 MDCT 영역에서 동작하고, 부호화 할 정보만 입력하는 기존의 오토 인코더와 다르게, 과거와 현재의 저대역 정보로 구성된 부가 정보를 추가로 입력하여 오토 인코더의 복원 성능을 향상시킨다. 특히, 시간-주파수 영역의 부가 정보를 사용하여 시간에 따른 신호 특성을 고대역 복원에 활용하도록 한다. 제안하는 방법에서 부호화기는 매 프레임마다 오토 인코더가 생성한 4차원 latent 벡터와 이득 정보를 12비트로 양자화 하여 전송한다. 복호화기는 과거와 현재 프레임에서 복원된 저대역 정보와 전송 받은 정보를 오토 인코더에 입력하여 고대역 정보를 복원한다. 청취 평가를 통하여 제안하는 방법이 SBR에 비하여 약 1/2의 비트율로 SBR과 동등 품질의 고대역 정보를 복원하는 것을 확인하였다.

• The Journal of Asian Finance, Economics and Business
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• 제8권8호
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• pp.67-74
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• 2021

This study aims to examine and analyze the effect of Risk Profile, Good Corporate Governance (GCG), Earnings, Capital (RGEC), and Earnings per Share (EPS) on stock prices with financial distress as an intervening variable. The sampling technique used purposive sampling based on certain criteria and data used was secondary data, that is, annual reports of commercial banks in Indonesia for the period of 2012-2018 with a sample of 23 banks from a total population of 81 banks. This type of research is explanative with a quantitative descriptive approach to describe or explain quantitative data. The data obtained was analyzed using SEM (Structural Equation Model) with the AMOS Program. The results showed that RGEC, EPS, and financial distress affect stock prices. This is based on testing the direct effect as indicated by a p-value that is smaller than 0.05. Based on the mediation test, the results show that financial distress cannot mediate the effect of RGEC and EPS on stock prices as indicated by a p-value greater than 0.05. The implication of this research is very important for investors to analyze stock price changes based on RGEC, EPS, and financial distress to gain profits. In addition, there are various warning signs indicating that a company is experiencing financial distress or it is heading towards such a state. Being aware of these signs can help prevent failure.

• 대한통합의학회지
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• 제8권4호
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• pp.125-131
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• 2020

Purpose : Lower extremity orthoses have been used as conservative methods to recover gait of the stroke patients. The purpose of this study is to examine how newly designed pelvic belt orthosis can improve gait ability and dynamic balance of adults with Hemiparesis after stroke. Methods : 22 patients who had hemiparesis after stroke participated in this study. Two groups were randomly created by assigning 10 subjects to the experimental group and the rest of the 12 subjects to the control group. The control group was treated by conventional physical therapy and occupational therapy. Identical therapy protocols were used to treat the experimental group who were assigned to wear the pelvic belt orthosis during post measurement. This study has a group of independent variables including group, gender, age, height, MAS, lesion side, cause and a group of dependent variables including gait speed, cadence, step length, stride length, and dynamic balance. The GAITRite system was used to measure spatial-temporal gain parameters and the balance system SD to measure dynamic balance. The data was analyzed using R version 3.3.1. Random forest, boosting algorithm, and MANOVA test were conducted to determine the effects of independent variables on dependent variables. Results : This study has a group of independent variables including group, gender, age, height, MAS, lesion side, cause and a group of dependent variables including gait speed, cadence, step length, stride length, and dynamic balance. The independent variable "group" has the most important value, which is approximately 25.42 (%IncMSE) representing a value three times greater than the second important predictor "height." Conclusion : As a result of this research, the hypothesis is validated with conclusion that Pelvic Belt orthosis could be effectively used for improving gait ability and balance of the patients with post-stroke hemiparesis.

• 한국정보통신학회논문지
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• 제24권11호
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• pp.1417-1423
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• 2020

본 논문에서는 수중에서 운동하는 무인잠수정의 경로점 유도법칙을 제안한다. 시선각 유도법칙과 수선경로 오차를 줄여가는 경로추종 유도법칙을 조합하여 효과적인 경로점 유도법칙을 설계하였고, 수선경로 오차의 거리에 따라 제어이득을 변화시켜 시스템의 안정성을 증가시켰다. 또한, 관성항법장치와 도플러속도계를 이용한 복합항법 시스템의 성능을 확인할 수 있는 HILS를 구성하였다. 같은 경로점 및 목표점을 입력 후 HILS 수행결과와 실해역 주행시험 결과를 비교하여, 제안한 유도법칙 및 HILS가 올바르게 구성되어 있음을 확인하였다.

• 한국항행학회논문지
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• 제24권6호
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• pp.601-606
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• 2020

본 논문에서는 연안 선박에서 사용 가능한 무선매체 중 Wimax/LTE 5G 시스템에 적용 가능한 마이크로스트립 패치 안테나를 설계하였다. 제안된 안테나의 기판은 FR-4 (er=4.3)이고 크기는 22 mm × 30 mm이며 마이크로스트립 패치 안테나를 이용하여 단순한 구조로 구성함으로서 Wimax/LTE 5G의 대역인 2.4 GHz와 3.5 GHz의 대역에서 사용할 수 있는 특성을 갖도록 설계하였다 시뮬레이션은 CST Microwave Studio 2014을 사용하였으며 시뮬레이션 결과 이득은 2.4 GHz일 때 2.41 dB, 3.5일 때 3.96 dB이다. S-Parameter 또한 원하는 주파수 대역에서 -10 dB (VSWR 2:1) 이하의 결과를 볼 수 있었고, 적은 변수와 소형화된 안테나를 설계하여 안테나를 휴대폰이나 전자기기에서 사용할 수 있도록 하였다.

• Nutrition Research and Practice
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• 제15권sup1호
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• pp.53-69
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• 2021

BACKGROUND/OBJECTIVES: To determine the weight change trend among the adult Turkish population after 1 yr of the coronavirus disease 2019 (COVID-19) pandemic and factors associated with weight change. MATERIALS/METHODS: This cross-sectional study was conducted between 26 February and 6 March 2021 using an online questionnaire that included questions for sociodemographic variables, eating habits, stress level, and the Three-Factor Eating Questionnaire-R18. Those who weighed themselves 1-2 weeks before the pandemic was declared in Turkey and remembered their weight were invited to participate in the study. Trends in weight and body mass index (BMI) change were calculated. The variables associated with a 1% change in BMI were assessed using hierarchical regression analysis. RESULTS: The study was conducted with 1,630 adults (70.25% female) with a mean age of 32.09 (11.62) yrs. The trend of weight change was found to increase by an average of 1.15 ± 6.10 kg (female +0.72 ± 5.51, male +2.16 ± 7.22 kg) for the first year of the COVID-19 pandemic. The rate of participants with a normal BMI (18.50-24.99 kg/m²) decreased to 51.91% from 55.75%. Consuming an "Increased amount of food compared to before the pandemic" was found to be the independent variable that had the strongest association with a 1% increase in BMI (β = 0.23 P < 0.001). The average change in the BMI was higher in older individuals than in those who were younger. A high stress level was associated with a decrease in BMI (β = -0.04 P = 0.048). CONCLUSIONS: In this study, the factors associated with weight change after 1 yr of the pandemic in the Turkish population was reported for the first time. A high stress level and increased weight gain trend still occur in Turkey after 1 yr of the pandemic.

• Journal of Genetic Medicine
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• 제18권2호
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• pp.110-116
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• 2021

Microdeletions of chromosome 22q11.2 are one of the most common microdeletions occurring in humans, and is known to be associated with a wide range of highly variable features. These deletions occur within a cluster of low copy repeats (LCRs) in 22q11.2, referred to as LCR22 A-H. DiGeorge (DGS)/velocardiofacial syndrome is the most prevalent form of a 22q11.2 deletions, caused by mainly proximal deletions between LCR22 A and D. As deletions of distal portion to the DGS deleted regions has been extensively studied, the recurrent distal 22q11.2 microdeletions distinct from DGS has been suggested as several clinical entities according to the various in size and position of the deletions on LCRs. We report a case of long-term follow-up of a female diagnosed with a 22q11.2 distal deletion syndrome, identified a deletion of 1.9 Mb at 22q11.21q11.23 (chr22: 21,798,906-23,653,963) using single nucleotide polymorphism array. This region was categorized as distal deletion type of 22q11.2, involving LCR22 D-F. She was born as a preterm, low birth weight to healthy non-consanguineous Korean parents. She showed developmental delay, growth retardation, dysmorphic facial features, and mild skeletal deformities. The patient underwent a growth hormone administration due to growth impairment without catch-up growth. While a height gain was noted, she had become overweight and was subsequently diagnosed with pre-diabetes. Our case could help broaden the genetic and clinical spectrum of 22q11.2 distal deletions.

• 전기전자학회논문지
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• 제25권4호
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• pp.762-765
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• 2021

본 논문에서는 자동차의 위치 및 자세 추정에 사용되는 칼만 필터 가속기를 내장한 차량용 ECU(electronic control unit)를 설계하고 구현하였다. 프로세서 코어는 RISC-V를 사용하였으며 칼만 필터의 행렬 연산을 수행하는 가속기, 차량 내 통신에 사용되는 CAN(controller area network) 제어기, 센서 연결에 사용되는 LIN(local interconnect network) 제어기를 내장하였다. 칼만 필터 연산은 시간 업데이트와 측정 업데이트의 두 단계로 나뉘며 시간 업데이트 단계에서는 현재 상태변수와 오차 공분산을 예측하고 측정 업데이트 단계에서는 입력값을 받아 칼만 이득을 계산하여 값을 보정한다. 보통 소프트웨어에서는 곱셈에 부동소숫점 연산을 사용하지만 본 논문에서는 하드웨어 면적을 줄이기 위해 정밀도 분석을 고려한 고정소숫점 곱셈기를 사용하였다. 설계된 ECU는 Verilog HDL을 이용하여 검증하였으며 28nm 실리콘 공정으로 구현하였다. 28nm 실리콘 공정으로 구현하였을 때 동작 주파수는 100MHz, 면적은 0.37mm², 게이트 수는 76만 게이트였다.

• Asian Journal for Public Opinion Research
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• 제9권2호
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• pp.142-160
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• 2021

The Internet and digital devices have become an important part of life among the youth (age 17-24) of today. During the COVID-19 pandemic in Indonesia, Internet use in youth increased by 19.3%, with an average usage of 11.6 hours per day. Youths gain a lot of opportunities from the Internet, but, it also exposes them to various risks. Therefore, there is a need for measures to make the Internet a safe place for youth, in a balanced way that addresses opportunities alongside risks, through digital literacy. It is expected that through digital literacy, youths can take advantage of online opportunities, without being subjected to any dangers. This study aims to examine the relationship between the digital literacy, online opportunities, and online risks of young people, while at the same time examining the influence of digital literacy on those online risks and opportunities. This study employed the quantitative study approach (explanatory study). Cross-sectional surveys and structured questionnaires were used for data collection. The results showed that youth's (age 17-24) monthly expenses, age, and education levels were important factors for digital literacy and online opportunity; also, the digital literacy variable plays an important role and affects online risk and opportunity positively. Digital literacy has a greater influence on online opportunities than it has on online risks. As youths spend more time online, they become more digitally literate, which can enable them to benefit more from new technology. Unfortunately, those with greater digital literacy cannot find a way to avoid risks while seeking opportunities.

• 한국시뮬레이션학회논문지
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• 제19권1호
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• pp.133-141
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• 2010

본 연구는 층화추출법과 통제변수기법을 시뮬레이션 실험설계에서 동시에 사용하여 파라미터의 추정 효율성을 개선하는 방법을 제안하였다. 시뮬레이션을 수행하는 도중에 수집한 표준화 부가변수를 통제변수기법에 활용하여 파라미터 추정을 위한 반응변수의 오차를 줄이도록 하였으며 통제변수 구성에 사용되지 않은 부가변수를 층화변수로 활용하는 층화추출기법을 적용하여 통제반응변수의 변이성을 추가로 감소하였다. 반응변수와 통제변수 사이의 공분산 관계가 알려진 경우에 두 방법을 동시에 활용하여 파라미터를 추정하는 기법의 시뮬레이션 효율성을 이론적으로 도출하였다. 반응변수와 통제변수 사이의 상관관계 구조가 알려지지 않은 경우 선택된 모형의 시뮬레이션 결과는 제안된 층화 통제 추정기법이 층화추출법이나 통제변수기법을 개별적으로 적용하여 파라미터를 추정하는 것보다 우수한 것으로 나타나고 있다.