새로운 유한요소 세분법에 관한 연구

황정선 空軍士官學校 1997 論文集 Vol.39 No.-

after an initial element mesh has been generated, a first analysis run, and the areas of the mesh requiring improvement identified, one must improve the el-ement discretization in those areas.here we propose the new mesh refinement technique for improving finite element discretizatins. it is based on moving no-dal positions while retaining the same element topology. by using the proposed technique, the given domain is rezone for a fixed number of quadrilateral elements such that fine elements are generated within the severely deformed re-gion and coarse elements elsewhere. loosely speaking, the area of an element is inversely proportional to the deformation measure at its centroid.

소비자중심 친환경농산물 활성화 방안

황정선 한국소비자원 2008 월간소비자정책동향 Vol.- No.8

노인장기요양시설 이용자 실태분석

황정선 한국소비자원 2010 월간소비자정책동향 Vol.- No.15

미래세대 소비자의 신소비문화 창출을 위한 소비자교육 체계화 방안

황정선 한국소비자원 2003 消費者問題硏究 Vol.- No.26

Factors Affecting Sentence-in-Noise Recognition for Normal Hearing Listeners and Listeners with Hearing Loss

황정선,김경현,이재희 대한청각학회 2017 Journal of Audiology & Otology Vol.21 No.2

Background and Objectives: Despite amplified speech, listeners with hearing loss oftenreport more difficulties understanding speech in background noise compared to normalhearinglisteners. Various factors such as deteriorated hearing sensitivity, age, suprathresholdtemporal resolution, and reduced capacity of working memory and attention can attributeto their sentence-in-noise problems. The present study aims to determine a primaryexplanatory factor for sentence-in-noise recognition difficulties in adults with or without hearingloss. Subjects and Methods: Forty normal-hearing (NH) listeners (23-73 years) andthirty-four hearing-impaired (HI) listeners (24-80 years) participated for experimental testing. For both NH and HI group, the younger, middle-aged, older listeners were included. Thesentence recognition score in noise was measured at 0 dB signal-to-noise ratio. The abilityof temporal resolution was evaluated by gap detection performance using the Gaps-In-Noise test. Listeners’ short-term auditory working memory span was measured by forwardand backward digit spans. Results: Overall, the HI listeners’ sentence-in-noiserecognition, temporal resolution abilities, and digit forward and backward spans were poorercompared to the NH listeners. Both NH and HI listeners had a substantial variability in performance. For NH listeners, only the digit backward span explained a small proportion ofthe variance in their sentence-in-noise performance. For the HI listeners, all the performancewas influenced by age, and their sentence-in-noise difficulties were associated withvarious factors such as high-frequency hearing sensitivity, suprathreshold temporal resolutionabilities, and working memory span. For the HI listeners, the critical predictors of thesentence-in-noise performance were composite measures of peripheral hearing sensitivityand suprathreshold temporal resolution abilities. Conclusions: The primary explanatoryfactors for the sentence-in-noise recognition performance differ between NH and HI listeners. Factors affecting sentence-in-noise recognition performance differed between NHand HI listeners. The working memory was the primary predictor of the sentence-in-noisescores for the NH individuals. In contrast, a combination of factors seemed to contributedto speech-in-noise understanding for the HI listeners. Given this, we must be careful not togeneralize findings from the NH listeners to the HI individuals.

[행복일기] 주름 속에 숨겨진 미소

황정선 샘터사 2015 월간 샘터 Vol.550 No.-

메타분석을 활용한 통합기술수용모형의 개선 연구: KCI 등재 논문 분석을 중심으로

황정선,이홍주,Hwang, Jeong-Seon,Lee, Hong Joo 한국빅데이터학회 2017 한국빅데이터학회 학회지 Vol.2 No.2

통합기술수용모형(UTAUT)은 기술수용모형(TAM, Technology Acceptance Model)의 한계점을 개선하기 위해 8가지의 기존 이론을 종합하여 제시된 것으로, 최근 신기술의 수용 및 확산과 관련된 다양한 분야에서 활용되어지고 있다. 본 연구는 메타분석을 통하여 UTAUT를 이용한 연구의 주요요인에 대해 분석과 연구모형의 일관성에 대한 검증을 하였다. 이를 통해 주요요인의 관계와 추가적 요인에 대한 결과를 제시하고 해석하였다. 아울러 선행연구와의 비교분석을 통해 차이점과 시사점을 제시하였다. 메타분석 결과, 추가적 요인으로 만족감, 쾌락동기, 태도, 지각된 즐거움이 중요한 것으로 분석되었으며, 이 결과를 바탕으로 확장된 UTAUT 모형을 제시하였다. 또한, 국내 연구의 경우 행동의도를 높이는 활동이 실제 행동으로 이어지는데 가장 중요한 요인으로 나타났다. 본 연구의 결과는 신기술이나 신제품의 수용 및 확산을 연구하는 연구자 및 신제품을 출시하고자 하는 기업에 도움을 제공할 것으로 예상한다. The UTAUT was presented as a comprehensive of eight existing theories to improve the limit of Technology Acceptance Model (TAM), and it has been also utilizing in various fields related to acceptance and diffusion of new technology. In this study, we analyzed factors utilized in UTAUT through meta-analysis, and confirms the consistency of the model. We presented the principal factors and the additional factors. Moreover, we presented differences and suggestions through comparative analysis with previous researches. The meta-analysis showed that satisfaction, hedonic motivation, attitude, perceived enjoyment showed a important factors as additional factors. Based on this result, we presented an extended UTAUT model. In the case of Korea studies, it was found that increasing the degree of behavior intention is the most important factor leading to use behavior. The results of this research will be able to support researchers who research the acceptance and diffusion of new technologies, and companies trying to launch new products.

쐐기 형태의 공기 간극이 있는 두 프리즘 경계에서 빛의 전반사 임계각 및 좌절된 전반사의 터널링 깊이 측정의 정량적 접근

황정선,김상년 한국현장과학교육학회 2018 현장과학교육 Vol.12 No.2

전자기 파동의 전반사와 소멸파는 경계면에서 전자기학 맥스웰 방정식의 잘 알려진 해이다. 이 연구에서는 전반사 임계각과 좌절된 전반사에서 터널링한 빛의 세기 분포를 정량적으로 측정하기 위한 장치들을 제작하였다. 광원은 파장 633 nm인 적색 레이저를 ND 필터로 세기를 충분히 감쇠하여 사용하였다. 감쇠된 빛은 두개의 직각 프리즘사이의 아주 좁은 쐐기형태의 공기 간극에 입사시켰다. 프리즘 뭉치는 2개의 스테핑 모터로 각각 회전과 수평 병진 동작을 구동하였다. 프리즘 뭉치에 입사하는 초기 입사각을 측정하고 이 측정값으로부터 빛이 공기 간극에 입사하는 각을 계산하였다. 공기 간극에 입사하는 지점의 위치는 수평 병진 이동 거리 측정값을 이용하여 계산하였으며, 그 위치에서 터널링하는 최단 공기 간극의 두께를 계산하였다. 터널링하는 빛의 세기는 광자 계수용 PMT로 측정하였다. 결과적으로 전반사 임계각을 정밀하게 0.06% 상대 오차로 측정할 수 있었다. 임계각 근방에서 불연속으로 패턴이 급변하는 빛의 세기 분포를 얻었다. 또한 임계각 이상의 입사각으로 공기 간극 경계면에 도달한 빛의 FTIR 분포에서 사용한 광원의 공기 간극 터널링 깊이를 얻었다. It is well known fact from the boundary solutions of Maxwell equations that electromagnetic waves are totally reflected inside a dense medium whenever the angle of incidence exceeds certain critical angle. Besides being totally reflected, the incoming wave penetrates into the less dense medium as an evanescent wave and travels for some depth. In this work, to measure the air gap penetrating depth of evanescent wave quantitatively, so called the frustrated total internal reflection(FTIR) phenomena, we used the traditional double prism arrangement which has a very narrow wedge shaped air gap. Specifically in this work, prism arrangement were controlled automatically by the 2 stepping motors to operate both rotational and translational work effectively. We measured the intensity of the FTIR by use of PMT photon counting system. As results, we found intensity pattern exactly looks like to well known thin film interference pattern when the incident angles were less than the critical angle. On the other hand, we measured very different exponentially decaying FTIR intensity patterns when the incident angle exceeds critical angle. Finally, we experimentally checked that evanescent wave can be penetrate across the air gap depth approximately correspond to 2 wavelength distance with the 99% probability.

항공기 재료용 알루미늄 합금의 피로파괴특성 연구

황정선 空軍士官學校 2000 論文集 Vol.45 No.-

In this study, crack retardations by instantaneous or periodic additions of overloads in the constant-amplitude loading were preponderantly analyzed among the fatigue fracture characteristics on Al 7075-76 as a main material for aircraft structures. By a little addition of overload, the number of cycles to fracture was considerably increased In comparison with that of the constant-amplitude leading. It means that the fatigue fracture characteristic of Al 7075-76 is improved by the overload. As the size of the overload was increased, the number of cycles to fracture was increased tin the same manner.

한국인도 외국인이다

황정선 열린전북 2007 열린전북 Vol.2007 No.9