전방 스피커 어레이 재생 방식 기반 음향 재현 성능 평가

유재현,장대영,이태진 한국방송∙미디어공학회 2015 방송공학회논문지 Vol.20 No.5

고화질, 고품질 방송에 대한 관심이 크게 증가하면서 영상 신호 뿐만 아니라 음향 신호의 고품질화를 요구하는 목소리도 높아지고 있다. 음향 신호의 고품질화에 기여하는 요소 중 하나는 가령, 10.2채널, 22.2채널 등과 같은 재생 채널 수의 확장이지만 이는 많은 수의 스피커를 설치해야만 하는 문제점이 발생한다. 이와 같은 문제를 해결하기 위한 한 가지 방법으로 전방 스피커 어레이를 통한 입체 음향 재생 방식을 들 수 있는데 본 논문에서는 스피커 어레이 기반 음장 재생 방식인 음장합성 기술 (Wave Field Synthesis, WFS)에 대한 소개 및 이론적인 분석을 하고 이 기술로 구현한 전방 스피커 어레이 시스템의 입체 음향 재현 성능을 확인하기 위한 주관 청취 평가 결과를 제시한다. 결론적으로, WFS에 기반한 전방 스피커 어레이 재생 방식이 디스크리트 5.1채널 재생 방식과 비교하여 만족스러운 음장감을 제공한다는 것을 알 수 있었다.

국내 인터넷상의 비만건강정보에 대한 평가 연구

유재현,손애리 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.6

The interest is closely related to the lives of modern people in the .21st Century. Exchanging information with others over the interest in any place through is possible nowadays and such exchanging information has been developed at rapid speed also in the areas of health and medical care. With increasing interest in their health, the tendency is that the number of the Internet users is on the increase. Such being the case, it has become urgently necessary to assess whether all information regarding health, medical care, products and services offered over the internet benefit the Internet users and the right information can be searched for and accessible. Under such circumstances, they have already developed barometers for such evaluation both at home end abroad, and have been evaluating the sites but the evaluation findings have been negative. This study was to evaluate sites ffering obesity health drawing increasingly keen interest of modern people and attempted to find out about the present conditions on such sites through their cross comparisons. We selected 210 local sites (14 public organizations and association, 34 general hospitals and clinics and 162 commercial organizations) by searching for such key words as obesity and diet at Rankey. com providing rankings in each area. The sites were evaluated and analyzed on the basis of 21 items under eight evaluation criteria such as contents, authorship, purpose, design, aesthetics, functionality, feedback, confidentiality and public interest, and caught hold of quality levels and present conditions of the sites. The research results showed most of the sites rated as short of expectation in respect of their contents and authorship, which amply attested to the necessity for the control of sites in the future as well as in the past. This seems to indicate that such control system as information certification system in the areas of health and medical care is required.

저축은행의 부도안PF대출 건전성 결정요인 분석 연구

유재현,노승한 한국부동산분석학회 2019 부동산분석학회 학술발표논문집 Vol.2019 No.1

Sinomenine, an Alkaloid Derived from Sinomenium acutum Potentiates Pentobarbital-Induced Sleep Behaviors and Non-Rapid Eye Movement (NREM) Sleep in Rodents

유재현,하태우,홍진태,오기완 한국응용약물학회 2017 Biomolecules & Therapeutics(구 응용약물학회지) Vol.25 No.6

Sinomenium acutum has been long used in the preparations of traditional medicine in Japan, China and Korea for the treatment of various disorders including rheumatism, fever, pulmonary diseases and mood disorders. Recently, it was reported that Sinomenium acutum, has sedative and anxiolytic effects mediated by GABA-ergic systems. These experiments were performed to investigate whether sinomenine (SIN), an alkaloid derived from Sinomenium acutum enhances pentobarbital-induced sleep via γ-aminobutyric acid (GABA)-ergic systems, and modulates sleep architecture in mice. Oral administration of SIN (40 mg/kg) markedly reduced spontaneous locomotor activity, similar to diazepam (a benzodiazepine agonist) in mice. SIN shortened sleep latency, and increased total sleep time in a dose-dependent manner when co-administrated with pentobarbital (42 mg/kg, i.p.). SIN also increased the number of sleeping mice and total sleep time by concomitant administration with the sub-hypnotic dosage of pentobarbital (28 mg/kg, i.p.). SIN reduced the number of sleep-wake cycles, and increased total sleep time and non-rapid eye movement (NREM) sleep. In addition, SIN also increased chloride influx in the primary cultured hypothalamic neuronal cells. Furthermore, protein overexpression of glutamic acid decarboxylase (GAD65/67) and GABAA receptor subunits by western blot were found, being activated by SIN. In conclusion, SIN augments pentobarbital-induced sleeping behaviors through GABAA-ergic systems, and increased NREM sleep. It could be a candidate for the treatment of insomnia.

인터넷 오픈마켓에서 쇼핑동기가 고객 만족도에 미치는 영향

유재현,박철 한국고객만족경영학회 2009 고객만족경영연구 Vol.11 No.3

This study investigated antecedents and consequences of consumer satisfaction toward Internet open market. The results of the study were as follows. First, economic motivation, convenience motivation, and recreational motivation influenced on consumer satisfaction. But social motivation did not appear significant to consumer satisfaction. Second, consumer satisfaction is positively related to re-usage intention and WOM. Based on the results, managerial implications for Internet open market were discussed. Finally, the limitation of this research and further research issues were suggested. 최근 온라인 소매업을 선도하고 있는 업태는 인터넷 오픈 마켓이다. 본 연구는 기존 문헌을 바탕으로 오픈 마켓 사이트에서의 쇼핑동기, 만족도, 재이용의도, 구전의도간의 인과모델을 제시하고 실증하였다. 그 결과 경제적 쇼핑동기, 편의적 쇼핑동기, 쾌락적 쇼핑동기는 만족도에 긍정적인 영향을 미쳤고, 사회적 쇼핑동기는 통계적으로 유의한 영향을 미치지 못하였다. 또한 만족도는 재이용의도와 구전의도에 유의한 영향을 미치는 것으로 나타났다. 이러한 실증결과를 바탕으로 오픈 마켓 활성화를 위한 마케팅적 시사점을 토의하고, 연구의 한계점과 향후 연구방향을 마지막에 제시하였다.

성인 여성의 슬관절 등속성 회전력과 등장성 최대근력간의 상관성과 차이율

유재현,송창호,이철원 한국코칭능력개발원 2004 코칭능력개발지 Vol.6 No.2

본 연구는 등속성 운동장비의 최대회전력과 등장성 운동장비의 최대근력(1RM) 간의 상관관계를 파악하고 두 장비의 측정결과에 대한 굴신비율과 좌우편차에 대한 차이를 검증하기 위해 여자 대학생 21(21.76±2.3O세)명을 대상으로 연구에 착수하였다. 슬관절 등장성 최대근력(1RM)은 Cybex사의 Knee Extension Machine과 Knee Flexion Machine을 사용하여 IRM을 측정하였고 슬관절 등속성 회전력은 Isokinetic Rehabilitation and Testing System을 이용하여 변인별 결과들을 평가하였다. 결과는 첫째, 장비간 슬관절 좌·우 신전근의 상관성은 통계적으로 유의한 수준에서 높게 나타났고, 좌·우 굴곡근의 상관성 또한 통계적으로 유의한 수준에서 높게 나타났다. 둘째, 등속성 최대회전력측정과 등장성 최대 근력검사에서 굴곡근의 좌·우 편차는 통계적으로 유의한 차이를 보이지 않았고 신전근에서도 통계적으로 유의한 차이를 보이지 않았다. 등속성 최대 회전력측정과 등장성 최대 근력검사의 굴신비율에서는 좌측에서는 통계적으로 유의한 차이를 나타내었으나, 우측에서는 각각 통계적으로 유의한 차이를 보이지 않았다. 결론적으로 등장성 장비를 이용한 최대근력(IRM)의 평가가 등속성 장비를 이용한 측정과 높은 상관을 보이고 좌우편차에서도 유의한 차이가 보이지 않으므로 등장성 장비를 통한 근력측정의 유용성이 있다고 판단된다. 하지만 두측정 장비 간 좌측의 굴신비율에서 유의한 차이를 나타낸바 여성의 등장성 근력 최대근력 측정에서는 세분화된 부하의 증가가 필요할 것으로 생각된다. The growing popularity of resistance training has lead to a need for estimating strength. Muscular strength can be measured or estimated. The purpose of this study was to compare the maximum strengths, the flexor and extensor ratios, and left and right differences between the isotonic maximum strength(lRM) and the isokinetic peak torque at knee joint in adult women. The subjects of the experiment were consisted of early twenties female without disabilities. The average age of subjects was 20.76 with ±2.30 deviations. Isotonic test used by Knee Extension Machine and Knee Flexion Machine for testing 1RM, and lsokinetic test used by lsokinetic Rehabilitation and Testing System for peak torque of quadriceps and hamstrings respectively. In results, this study were shown as followed. 1) The correlation of extensor between test machines showed r=O.724(p<O.00l) on left, and r=O.812(p<O.00l) on right. Flexor showed r=O.745(p<O.00l) on left, and r=O.747(p<O.001) on right. The significance statistically showed high correlations between isotonic one repetition maximum and isokinetic peak torque. 2) The deviations of strengths between left and right muscles were not significantly different on both test machines. 3) The differences between flexor and extensor ratios were not significantly different on right of both test machines. But left were significantly different. In conclusion. the results of these data suggests that 1RM of isotonic test was predicted factors of isokinetic peak torque. Thus, we hope the field exercise specialists to reference for management of exercise participants.

핀테크 서비스의 확산의도에 영향을 미치는 요인에 관한 연구 : 간편결제 서비스를 중심으로

유재현,박종찬,김기훈 한국산업경제학회 2018 산업경제연구 Vol.31 No.1

Mobile simple payment services based on Pin Tech are rapidly growing through both the spread of smart-phone and revitalization of mobile shopping. And Pin-Tech is emerging as a new growth engine for ICT and retailers as well as financial companies. Accordingly, various studies on the mobile simple payment services have been reported. However, most of the researches related to the existing mobile simple payment services are just about the research on the current status and prospect of mobile simple payment services or the simple acceptance of mobile payment services. In addition, studies on continuous acceptance have mainly focused on applying TAM or UTAUT, and there is not many researchs on the spread of mobile simple payment services. Hence, in this study, we developed a diffusion model for the factors affecting the spread of Pin-Tech based mobile simple payment services and conducted robust empirical analysis. As a result of the analysis, network externality, usefulness, and social image have a positive effect on satisfaction. And satisfaction has a positive effect on diffusion intention. Based on these empirical analysis, marketing implications for mobile simple payment services are discussed. Finally, the limitation of this research and further research issues are suggested. 스마트폰의 보급과 모바일 쇼핑의 활성화에 힘입어 핀테크 기반의 간편결제 서비스는 빠르게 성장하고 있으며, 이것은 금융기업 뿐만 아니라 ICT 및 유통 기업의 신 성장 동력으로 작용하고 있다. 이에 따라 핀테크 기반의 간편결제 서비스에 관한 다양한 연구들이 보고되고 있다. 그러나 기존의 간편결제 서비스에 관련된 연구들은 간편 결제서비스의 현황 및 전망에 관한 연구나 단순 수용에 관한 연구들이 대부분이었다. 또한 지속적 수용에 관한 연구들도 TAM이나 UTAUT를 적용하는 데 초점이 맞추어져 있고 간편결제 서비스의 확산에 관한 연구는 미비한 실정이다. 이에 본 연구에서는 핀테크 기반 간편결제 서비스의 확산에 영향을 미치는 요인에 관한 확산모델을 제안하고 실증 분석을 실시하였다. 분석결과, 네트워크 외부성과 유용성, 사회적 이미지는 만족에 긍정적인 영향을 미치는 것으로 나타났다. 그리고 만족은 확산의도에 긍정적인 영향을 미치는 것으로 나타났다. 이러한 실증 결과를 바탕으로 간편결제 서비스에 관한 마케팅적 시사점을 제시하였다. 마지막으로 연구의 한계점 및 향후 연구 방향을 제시하였다.

지구환경문제와 도시계획

유재현 대한국토도시계획학회 1992 도시정보 Vol.11 No.8

補益方劑間의 聯關性 確立에 對한 文獻的 硏究

유재현,이병욱,김재광,제갈경환,노종성,변성희,김상찬 대한한의학방제학회 2024 대한한의학 방제학회지 Vol.32 No.4

Objectives : In the Eastern Asian traditional herbal medicine, the number of herbal formulas has increased due to the accumulation of clinical experience. In order to understand the modified herbal medicine, much analysis has been conducted on the constituent drugs, effects, and clinical applications. However, these study patterns make it difficult to identify disease mechanisms, utilization of herbal formula and herbal formula interrelationships. For alleviate these difficulties, it is important to understand the diseases mechanism and it’s flow by comparing and analyzing the interconnection between formulas. In this study, the interconnection between Tonify formulas (TF; 補益劑) was investigated by analyzing and comparing of 59 herbal formulas. Methods : On the basis of Herbal Formula textbook, the TF herbal formula was bibliographically analyzed for ingredients, effects, clinical applications, disease causes and mechanisms. Results : In order to improve cognition of the interrelationship between TF herbal formulas, the formulas ingredients, effect, applications, disease causes etc. of each formula were analyzed. As a result, the 26 types of herbal formula interrelationships were identified by 4 classes. Conclusions : Finally, this study established the interrelation of TF herbal formula as one figure. This result could contribute to improve cognition on the interrelationship of TF herbal formulas.

다양한 분산형전원과 분산형전원 연계 조건을 고려한 배전계통 해석 장치 개발

유재현,최승연 대한전기학회 2023 전기학회논문지 P Vol.72 No.3

This paper presents a distribution system analysis program developed based on various distributed generations (DGs) and distributed generation connection codes. The program can perform an accurate analysis to improve the stability and reliability of the distribution system, considering the fault characteristics of the inverter-based DGs, the DG isolated operation, and the DG connection codes. Finally, the program can use the multi-slacks in the case of loop distribution systems. This paper deals with establishing and verifying an interface to the analysis program.