Partial Discharge Characteristics in LLDPE-Natural Rubber Blends

Aulia,Mohd Hafizi Ahmad,Zulkurnain Abdul-Malek,Yanuar Z. Arief,Kwan Yiew Lau,Novizon 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.3

Partial discharges (PD) lead to the degradation of high voltage cables and accessories. PD activities occur due to the existence of impurities, voids, contaminants, defects and protrusions during the manufacture and installation of power cables. Commonly, insulation failures occur at cable joints and terminations, caused by inhomogeneous electric field distributions. In this work, a blend of natural rubber (NR) and linear low density polyethylene (LLDPE) was investigated, and the optimal formulation of the blend that could resist PD was discussed. The experiments were conducted under a constant high voltage stress test of 6.5 kV AC and the magnitude of partial discharge activities was recorded using the CIGRE method II. Pattern analysis of PD signals was performed along with the interpretation of morphological changes. The results showed that the addition of 10 wt% of NR and 5 wt% of Alumina Trihydrate (ATH) provided promising results in resisting PD activities. However, as the NR content increased, more micropores existed, thus resulting in increased PD activities within the samples.

Partial Discharge Characteristics in LLDPE-Natural Rubber Blends: Correlating Electrical Quantities with Surface Degradation

Aulia, Aulia,Ahmad, Mohd Hafizi,Abdul-Malek, Zulkurnain,Arief, Yanuar Z.,Lau, KwanYiew,Novizon, Novizon The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.3

Partial discharges (PD) lead to the degradation of high voltage cables and accessories. PD activities occur due to the existence of impurities, voids, contaminants, defects and protrusions during the manufacture and installation of power cables. Commonly, insulation failures occur at cable joints and terminations, caused by inhomogeneous electric field distributions. In this work, a blend of natural rubber (NR) and linear low density polyethylene (LLDPE) was investigated, and the optimal formulation of the blend that could resist PD was discussed. The experiments were conducted under a constant high voltage stress test of 6.5 kV AC and the magnitude of partial discharge activities was recorded using the CIGRE method II. Pattern analysis of PD signals was performed along with the interpretation of morphological changes. The results showed that the addition of 10 wt% of NR and 5 wt% of Alumina Trihydrate (ATH) provided promising results in resisting PD activities. However, as the NR content increased, more micropores existed, thus resulting in increased PD activities within the samples.

The Bullet Launcher with A Pneumatic System to Detect Objects by Unique Markers

Jasmine Aulia,Zahrah Radila,Zaenal Afif Azhary,Aulia M. T. Nasution,Detak Yan Pratama,Katherin Indriawati,Iyon Titok Sugiarto,Wildan Panji Tresna 한국정보통신학회 2023 Journal of information and communication convergen Vol.21 No.3

A bullet launcher can be developed as a smart instrument, especially for use in the military section, that can track, identify,detect, mark, lock, and shoot a target by implementing an image-processing system. In this research, the application of objectrecognition system, laser encoding as a unique marker, 2-dimensional movement, and pneumatic as a shooter has been studiedintensively. The results showed that object recognition system could detect various colors, patterns, sizes, and laser blinking.Measuring the average error value of the object distance by using the camera is ±4, ±5, and ±6% for circle, square and triangleform respectively. Meanwhile, the average accuracy of shots on objects is 95.24% and 85.71% in indoor and outdoor conditionsrespectively. Here, the average prototype response time is 1.11 s. Moreover, the highest accuracy rate of shooting results at 50cm was obtained 98.32%.

Frailty among Older Adults Living in Nursing Homes in Indonesia: Prevalence and Associated Factors

Aulia Rizka,Andika Indrarespati,Noto Dwimartutie,Muhadi Muhadi 대한노인병학회 2021 Annals of geriatric medicine and research Vol.25 No.2

Background: Frailty syndrome is a predictor of all-cause mortality among older adults living in nursing homes. However, data on the prevalence of frailty among individuals living in nursing homes, particularly in middle-income countries, are limited. Thus, this study aimed to determine the prevalence of frailty and identify its associated factors among older adults living in nursing homes in Indonesia. Methods: This cross-sectional study of older adults living in six nursing homes in Indonesia was conducted between May and December 2019. Data on demographic characteristics, physical activity (Physical Activity Scale for the Elderly), cognitive status (Abbreviated Mental Test), nutritional status (Mini Nutritional Assessment Short-Form), depression (Geriatric Depression Scale), comorbidity, frailty state (Cardiovascular Health Study criteria), dietary pattern (24-hour food recall), handgrip strength, and gait speed were evaluated. Bivariate and multivariate analyses were performed to identify factors independently associated with frailty. Results: This study recruited a total of 214 participants with a mean age of 73.68±4.30 years. The prevalence rates of frailty and malnutrition were 46.5% and 58%, respectively. The results showed that physical frailty was associated with malnutrition (odds ratio=4.23; 95% confidence interval, 1.730–10.380). Conclusion: Frailty was prevalent and strongly associated with malnutrition among older adults living in nursing homes in Indonesia.

The Influence of Related Party Transaction and Corporate Governance on Firm Value

Aulia Fuad RAHMAN,Yeterina Widi NUGRAHANTI 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.6

This study aims to examine the effect of political connections on firm value through related party transaction (RPT) as a mediator in the context of emerging Indonesian economy. This study also aims to investigate the moderating role of corporate governance mechanism on the relationship between political connections and RPT. The theory used as the basis for this research is agency theory. The corporate governance mechanism tested in this study consists of independent board of commissioners, institutional ownership and board of commissioner size. Tobin’s Q is used to measure firm value. The population of this study is all companies listed on the Indonesia Stock Exchange in 2015–2018. Purposive sampling was conducted, and 271 non-financial companies (1,084 firm-years) were identified as the samples. For testing the hypotheses, panel generalized least square (GLS) using EViews 10 was used. The findings showed that political connection had a negative impact on firm value. The results also showed that RPT abnormal account receivables and RPT abnormal asset non-account receivable mediate the relationship between political connections and firm value. In addition, it is found that corporate governance mechanism, especially the proportion of independent board of commissioners and institutional ownerships, weakens the positive effect of political connection on RPTs.

Proarrhythmogenic Effect of the L532P and N588K KCNH2 Mutations in the Human Heart Using a 3D Electrophysiological Model

Aulia Khamas Heikhmakhtiar,Abebe Tekle Abrha,Da Un Jeong,임기무 대한의학회 2020 Journal of Korean medical science Vol.35 No.29

Background: Atrial arrhythmia is a cardiac disorder caused by abnormal electrical signaling and transmission, which can result in atrial fibrillation and eventual death. Genetic defects in ion channels can cause myocardial repolarization disorders. Arrhythmia-associated gene mutations, including KCNH2 gene mutations, which are one of the most common genetic disorders, have been reported. This mutation causes abnormal QT intervals by a gain of function in the rapid delayed rectifier potassium channel (IKr). In this study, we demonstrated that mutations in the KCNH2 gene cause atrial arrhythmia. Methods: The N588K and L532P mutations were induced in the Courtemanche-Ramirez-Nattel (CRN) cell model, which was subjected to two-dimensional and three-dimensional simulations to compare the electrical conduction patterns of the wild-type and mutant-type genes. Results: In contrast to the early self-termination of the wild-type conduction waveforms, the conduction waveform of the mutant-type retained the reentrant wave (N588K) and caused a spiral break-up, resulting in irregular wave generation (L532P). Conclusion: The present study confirmed that the KCNH2 gene mutation increases the vulnerability of the atrial tissue for arrhythmia.

The 37<SUP>th</SUP> Progress In Electromagnetics Research (PIERS) in Shanghai

Aulia Dewantari,김수민,전세연,김재흥,가민호 한국전자파학회 2017 전자파기술 Vol.28 No.2

A Study on English Reading Strategy Use of Korean College Students

( Aulia Djunaedi ),이정원 ( Jeong Won Lee ) 충남대학교 인문과학연구소 2013 인문학연구 Vol.45 No.3

본 연구의 목적은 한국의 대학생들이 어떠한 영어 읽기 전략을 사용하는 지에 대해 알아보고 그들이 이러한 영어 읽기 전략을 사용하는데 있어 어떤 태도를 견지하고 있는지에 대해 살펴보는 것이다. 이 연구를 위해 Mokhtari와 Sheorey(2002)가 도입한 읽기 전략 조사(Survey of Reading Strategies)를 사용했는데, 이 조사지는 학생들이 자신들의 읽기 전략에 대해 더 잘 인식할 수 있도록 돕는 간단하면서도 효과적인 도구로 알려져 있다. 이 연구에는 120명의 한국 대학생들이 참가했다. 연구 자료는 설문지와 면담을 통해 얻어졌는데, 먼저 설문지는 연구 참여자들이 사용하는 영어 읽기 전략에는 어떤 것이 있는지 알아보고, 그들이 이 전략을 사용하는데 있어서 어떤 태도를 견지하고 있는지를 도출해내기 위해 사용되었고, 면담은 설문 조사를 통해 얻어진 응답에 대해 더 자세하고 혹시 있을지 모를 부가적인 정보를 얻기 위해 실시되었다. 이러한 두 가지 방법을 통해 얻어진 결과로는 한국의 대학생들은 총체적 읽기 전략(global reading strategies)을 가장 선호하지 않았으며, 지원 읽기 전략(support reading strategies)을 가장 빈번히 사용하는 것으로 드러났다. The purpose of the current study is to discover which English reading strategies Korean university students use and which attitude they have toward their reading strategy use. For this study, the Survey of Reading Strategies (SORS) introduced by Mokhtari and Sheorey (2002) was adopted, which is presented as a simple, yet effective tool for enabling students to develop a better awareness of their reading strategies. This study involves 120 Korean university students. The data were by means of questionnaire and interview. The questionnaire was used to elicit the participants`` English reading strategy use and attitude toward using strategies, while interview was performed to get more detailed and additional, if any, information about their responses on the questionnaire. When both questionnaire and interview data obtained from the Korean university students are combined, the results show that global reading strategies are the students`` least favorite, and that support reading strategies are the most frequently used by Korean university students.

Surgical management of male genital lymphedema: A systematic review

Aulia, Indri,Yessica, Eva Chintia Korean Society of Plastic and Reconstructive Surge 2020 Archives of Plastic Surgery Vol.47 No.1

Genital lymphedema (GL) is an uncommon and disabling disease that manifests as enlargement of the genital region resulting from the disturbance of lymphatic drainage. Although conservative treatment such as decompression is typically the first-line approach, surgical intervention has been shown to be effective in certain cases. This study aimed to systematically review studies evaluating available surgical alternatives for the treatment of male GL. A systematic search strategy using keyword and subject headings was applied to PubMed, Scopus, EMBASE, and Cochrane Library in May 2019. Studies investigating various surgical techniques to treat penile and scrotal lymphedema were included. The potential risk of bias of included trials was evaluated using the methodological index for non-randomized studies (MINORS). In total, 13 studies met the inclusion criteria, nine of which were determined to be high-quality. The average MINORS score was 12.45 for studies involving excision and 14 for studies involving lymphovenous anastomosis (LVA). The most common reason for a low score was a failure to describe the inclusion criteria. Recurrence of lymphedema during follow-up was reported in four studies involving excision and in no studies involving LVA. In general, the quality of the included literature was considered to be fair. Although surgical intervention might not always prevent the recurrence of lymphedema, all of the studies reported improved quality of life after the procedure. This study could be used as the basis for evidence-based guidelines to be applied in clinical practice for managing male GL.

Current Perspectives in Vaginal Laxity Measurement: A Scoping Review

Aulia Indri,Valeria Michelle 대한성형외과학회 2023 Archives of Plastic Surgery Vol.50 No.5

This scoping review aimed to identify and categorize the available measurement options for vaginal laxity (VL), their indications of use, and whether these measurements can sufficiently provide objective clinical judgment for cases indicated for vaginal rejuvenation with many treatment options nowadays. Systematic searches were conducted on five electronic databases, manually searching articles' bibliographies and predetermined key journals with no date or study design limitations. We included all studies involving VL in their inclusion criteria, treatment indications, and outcome parameters. We used the Arksey and O'Malley frameworks as the guideline in writing this scoping review. Of the 9,464 articles identified, 66 articles and 11,258 subjects were included in the final analysis. The majority of studies were conducted in obstetrics and gynecology (73%), followed by plastic surgery (10%), medical rehabilitation (4.5%), dermatology (4.5%), and others (8%). Most studies originated from the North American region (30%). The following measurement tools were used: (1) interviews, (2) questionnaires, (3) physical/digital examinations, (4) perineometers, and (5) others. Our results suggested that subjective perception of laxity confirmed by directed interview or questionnaire is sufficient to confirm VL. Additional evaluation of pelvic floor muscle through digital examination or perineometer or other preferred tools and evaluation of sexual function through validated questionnaire (Female Sexual Function Index, Female Sexual Distress Scale-Revised, etc.) should follow to ensure holistic care to patients. Future research on the psychometric properties (reliability and validity) of commonly used measurements and the correlation in between subjective and objective measurements should be initiated before their clinical applications.