• 한국소음진동공학회논문집
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• 제21권6호
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• pp.521-528
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• 2011

A variety of noise control methods have been developed as an interest on noise issues increases. Among them, noise control methods using masking effect, a phenomenon to reduce the ability to notice the unwanted sound by proper sound, to implement a pleasant sound environment have been studied under the name of soundscape. We proposed a novel vector base amplitude panning(VBAP) based noise control method to apply to the building environment. The proposed method could improve the amenity inside the building to reproduce the sounds with excellent masking effect on the incoming path of noise using the control speakers, considering the direction of noise source. The directional masking sounds can be generated by using VBPA technique. To verify the performance of the proposed method, we carried out the subjective test for the degree of amenity according to direction of the masking sound. Subjective test results showed that it is possible to improve the amenity inside the building by controlling the direction of masking sound considering the human's auditory characteristic.

• 한국인쇄학회지
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• 제6권1호
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• pp.59-66
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• 1988

One of the rising problems in the field of environmental engineering is the eutrophic phenomenon which appears in the closed water basin. This study is the elimination orthophosphate by adsorption, which is indispensible nutritive element for eutrophication Ziriconium(IV) oxide hydrate-activatedcarbon complex. which has excellent adsorptivity for orthophosphate and can easily be reused after desorption process has been made and used as adsorbents. The main purpose of this study is to obtain intraparticle diffusivity which is basic data for the design of adsorption operation the experimental results were as follows. 1. Optimum condition which gave maxinum adsorption of orthophosphate was ph5 2. Equilibrium adsorption showed good consistency with Freundlich type. q=10.80C1/2.08 3. Pore diffusivity and surface diffusivity obtained the kinetic experiment of batch adsorption were respectivity 5.38 and 2.06 ($\textrm{cm}^2$/sec)

• Journal of the Korean Statistical Society
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• 제30권1호
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• pp.139-151
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• 2001

Although lots of works are done in influence diagnostics, results in the multivariate analysis are quite rare. One of recent works done by Fung(1995) is about the single case influence diagnostics in the linear discriminant analysis. In this paper we extend Fung's results to the multiple cases diagnostics which are necessary in the linear discriminant analysis for two reasons among others; First, the masking effect cannot be detected by single case diagnostics and secondly two populations are concerned in the discriminant analysis, i.e., influential cases can occur in one or both populations.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 추계학술대회논문집 II
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• pp.1114-1119
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• 2001

Previously, we have analyzed Vehicle interior noise by dBA based analysis. However, dBA based analysis can not describe the various sound phenomenon that consumer hear. Sound quality matrics can describe various sound phenomenon that dBA based analysis could not explain. In this paper, we will demonstrate the difference of between dBA based analysis and real sound feeling, and analyze sound examples by sound metrics and Principle Component Analysis. In this way we can analyze vehicle interior noise more effectively.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제11권12호
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• pp.517-524
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• 2022

사람의 자세추정(Human pose estimation)은 사람의 관절 키포인트를 추출하여 자세를 추정하는 방법이다. 폐색현상(Occlusion)이 발생하면, 사람의 관절이 가려지므로 관절 키포인트 추출 성능이 낮아진다. 폐색현상은 총 3가지로 행동할 때 스스로 가려짐, 다른 사물에 의해 가려짐과 배경에 의해 가려짐으로 크게 나뉜다. 본 논문에서는 폐색현상 증강기법을 활용하여 효과적인 자세추정방법을 제안한다. 자세추정방법이 지속적으로 연구되어왔지만, 자세추정방법의 가려짐 현상에 관한 연구는 상대적으로 부족한 상태이다. 이를 해결하기 위해 저자는 사람의 관절을 타겟팅하여 의도적으로 가리는 데이터 증강기법을 제안한다. 본 논문에서의 실험 결과는 의도적으로 폐색현상 증강기법을 활용하면 폐색현상에 강인하며 성능이 올라간 것을 보여준다.

• 방송공학회논문지
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• 제8권1호
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• pp.11-18
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• 2003

본 논문에서는 잡음 에너지에 의한 지각적 간섭현상 해석을 통한 지각적 컨벌루션 잡음 제어에 의한 음질 개선 방법을 연구하였다. 지각적 컨벌루션 잡음은 잡음에 의한 신호의 지각적인 특성 변화 및 잡음 추정오차에 의한 잔여 잡음의 영향을 반영하는 것이다. 실험 결과 임계대역 여기 에너지를 통한 지각적 부가 잡음 제어 필터와 순음도 변화도를 통한 지각적 컨벌루션 잡음 제어 필터가 대등한 음질 개선 성능을 나타내었으며, 다양한 잡음 환경에서도 우수한 음질 개선을 나타냄을 확인 할 수 있었다.

• 산업경영시스템학회지
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• 제25권6호
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• pp.7-11
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• 2002

This paper estimates defect and outbreak probabilities of each individual component from some subset of masked data where the exact component causing system failure might be unknown. A system consists of k components that fails whenever there is a defect in at least one of the components. Due to cost and time constraints it is not feasible to learn exactly which components are defective. Because, test procedures ascertain that the defective components belong to some subset of the k components. This phenomenon is termed masking. We describe a, b, c type in which a sample of masked subsets is subjected to intensive failure analysis. This recorded data of a, b, c type enables maximum likelihood estimation of defect probability of each individual component and leads to outbreak of the defective components in future masked failures.

• 한국산학기술학회논문지
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• 제11권4호
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• pp.1325-1332
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• 2010

미세증가감수지수 검사는 감각신경성난청의 세부 병변을 감별하기 위하여 사용되는 누가현상을 판별하는 검사이다. 본 논문은 PC 기반 소프트웨어로 구현한 미세증가감수지수 검사 소프트웨어를 기술한다. 구현된 소프트웨어는 검사자의 검사 참여 유 무에 따라 수동 검사와 자동 검사의 두 가지 모드를 제공함으로써 경제적인 검사가 진행 될 수 있게 한다. 또 필요할 경우에 자동으로 차폐를 수행한다. 그리고 1dB의 순간 상승음에 대한 검사뿐만 아니라 2dB와 5dB 상승음에 대한 검사도 지원함으로써 보다 정확한 검사 결과를 얻을 수 있도록 한다.

• 한국진공학회지
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• 제5권2호
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• pp.139-146
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• 1996

rf 마그네트론 스파터링법을 이용하여 투명 전도성 Sb-doped $SnO_2$ 박막을 증착하였으나 박막표면에서 막손상현상이 발생하였다. 특히 기판 중심부 및 타게트 부식부위에 대응하는 부분에서 발생된 막손상을 방지하고자 , 환원형의 마스크 유리가 타게트표면에서 1.5cm지점에 설치되었다. 또한 마그네트론 스파터링의 작동조건인 rf전력, 스파터링 가스압력 및 기판온도를 최적으로 조절하면서 박막의 균일성과 전기적 특성을 평가하였다. 작동조건을 이용한 실험결과에서 균일하고 막손상이 없는 박막을 증착하는 최적온도는 압력 변화에 따라 변하며, 비율은 50w의 rf전력에서 5mTorr당 약 $100^{\circ}C$정도였다. 유사하게 rf 전력？ md가에 대한 보상에서 최적온도는 적절한 비율로 내려간다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 추계학술대회 논문집 Vol.21
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• pp.259-259
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• 2008

The LTCC (Low Temperature Co-fired Ceramic) technology meets the requirements for high quality microelectronic devices and microsystems application due to a very good electrical and mechanical properties, high reliability and stability as well as possibility of making integrated three dimensional microstructures. The wet process, which has been applied to the etching of the metallic thin film on the ceramic substrate, has multi process steps such as lithography and development and uses very toxic chemicals arising the environmental problems. The other side, Plasma technology like ion beam sputtering is clean process including surface cleaning and treatment, sputtering and etching of semiconductor devices, and environmental cleanup. In this study, metallic multilayer pattern was fabricated by the ion beam etching of Ti/Pd/Cu without the lithography. In the experiment, Alumina and LTCC were used as the substrate and Ti/Pd/Cu metallic multilayer was deposited by the DC-magnetron sputtering system. After the formation of Cu/Ni/Au multilayer pattern made by the photolithography and electroplating process, the Ti/Pd/Cu multilayer was dry-etched by using the low energy-high current ion-beam etching process. Because the electroplated Au layer was the masking barrier of the etching of Ti/Pd/Cu multilayer, the additional lithography was not necessary for the etching process. Xenon ion beam which having the high sputtering yield was irradiated and was used with various ion energy and current. The metallic pattern after the etching was optically examined and analyzed. The rate and phenomenon of the etching on each metallic layer were investigated with the diverse process condition such as ion-beam acceleration energy, current density, and etching time.