• 대한인간공학회지
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• 제18권2호
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• pp.81-89
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• 1999

User's characteristics on the screen adjustment of color TV were studied. Two experiments were performed. In the first experiment, the characteristic of screen adjustment according to TV program, ambient luminance, and gender was investigated. Twenty subjects (10 females and 10 males) were participated in this experiment. Set points of brightness, contrast, tint, and color were measured on TV screen and analyzed. Brightness and contrast were significant on gender at significant level 0.01 and color was significant on gender at significant level 0.1. Tint was significant on program at significant level 0.01. The second experiment was performed to supplement the first experiment. The influences of ambient luminance, presented image, screen setting criteria, and gender were investigated. We simplified the first experiment in the second one. We restricted dependent variables (screen control variables) to only two, brightness and contrast. Other control variables were fixed to middle values. Brightness and contrast were significant on gender and screen setting criteria at significant level 0.01. In conclusion, we found that ambient luminance and presented image had no significant effects on TV screen adjustment and TV program had only a significant effect on tint. However, we found that gender and screen setting criteria had significant effects in most conditions.

• 한국물환경학회지
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• 제29권2호
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• pp.165-169
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• 2013

Freshwater fish intake is a critical parameter for deriving water quality criteria and water quality standards for protection of human health based on human health risk assessment. Although the freshwater fish intake parameter should be accurate and representative of Korean fish consumption for the water quality criteria to be reliable, data are limited in Korea and have low reliability. In this study, Korean National Health and Nutrition Examination Survey data from 2008-2010 were analyzed to reevaluate freshwater fish consumption. Based on these results, an average consumption rate of 3.0 g/day per person, a $90^{th}$ percentile consumption rate of 0.0 g/day per person, an average consumption rate of 65.7 g/day per fish consumer, and a $90^{th}$ percentile consumption rate of 153.4 g/day per fish consumer were proposed for derivation of water quality criteria using a conservative approach and various exposure scenarios.

• 한국안전학회지
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• 제25권5호
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• pp.27-32
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• 2010

This study is to investigate and compare domestic hazardous toys with harmful substances with foreign toys so that we can find out management criteria for in cognitive infants. Actually, commercially used toys have been collected and tested to find out more effective management standard. it is tried to produce evaluation criteria of environmentally harmful substance but variety of product is needed for overcoming actual barrier due to lot of difficulty huge cost, time, objectiveness. Therefore, This study does not cover all the above. Establishment of evaluation criteria for product harmfulness made by Government or Local government should be continued to improve. Foreign reference material for toy product in Europe, USA, Japan have been investigated and domestic product have been collected and tested for containing heavy metals, formaldehyde, phthalate in the study. All the test have been made in accordance with KSM ISO 2124 to measure heavy metal transfer into body. Toy product used for the study have been purchased in the real market and some of them contains harmful elements with over standard. Post management system such as RAPEX to control periodically should be established for plastic toy with low quality product.

• 한방안이비인후피부과학회지
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• 제30권3호
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• pp.76-87
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• 2017

Objectives : This study aimed to analyze the recent acupuncture clinical trial on atopic dermatitis and to suggest the plan about how to improve its quality. Methods : Data were collected through electronic database including MEDLINE. We set up the search terms for "atopic dermatitis AND acupuncture" and limited period of data within 6 years and type for RCT(Randomized Clinical Trial), SR(Systemic Review). Results : Total 5 studies were selected. Two were RCTs, and the rest were SRs. RCTs were insufficient about acupoint selection criteria and foundation. SRs both pointed out that systematic clinical trial is required. Conclusions : Based on these, we suggested the plan as follows. 1. Selection criteria - We should reevalute the participants by using diagnostic criteria and scales. 2. Selection acupoints - We should present the foundation that why we choose these acupoints. 3. Establishing acupuncture and control group - We should make control group clearly after calculating the number of participants statistically. 4. Blinding - We should propse the method, type, procedure and evaluation about randomization. 5. Evaluation scale - We should select the suitable scales for research objectives.

• 자동차안전학회지
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• 제5권2호
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• pp.45-50
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• 2013

The whiplash Injuries due to rear collision occur frequently. As result, in many countries, seat performance is being assessed and developed to improve head whiplash injury in rear collision of passenger car. This study compares whiplash assessment methods in each country. Using the DFSS(Design for Six Sigma) method, the correlation between influence parameters of head restraints and whiplash injury criteria is analyzed. Four control factors are used in this study. And total 11 whiplash injury criteria from NCAP(New Car Assessment Program) of Korea, Europe, China and IIHS(Insurance Institute for Highway Safety) of USA are used for output response. By the experimental design, L9 orthogonal coordinate system is configured and is tested by sled test equipment, twice. By using average assay value and ANOVA, the correlation between control factors and injury criteria has been comprehended. Optimization design of head restraint according the regional seat safety assessment was derived through the correlation.

• 한국항공운항학회지
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• 제22권4호
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• pp.65-74
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• 2014

Unmanned aerial vehicles(UAVs) refer to the aircraft which carries no human pilot and is operated under remote control or in autonomous operational mode. As the UAVs can perform the dull, dangerous and difficult missions, various kinds of UAVs with different sizes and weights have been developed and operated for both civil and military application. As the avionics and communication technology related to the UAVs are matured, the demand for the UAVs is dramatically increased. Therefore, It is important to develope airworthiness process and regulations of the UAVs to minimize related risk to the man and environment. This paper describes related regulations and classification of the small UAVs for different international airworthiness authorities. The analysis of the CS-LURS verses Stanag 4702 and Stanag 4703 can provide guidelines for the generation of the airworthiness certification criteria for the small UAVs in civil sector. This paper conducted kinetic impact energy analysis of the loss of the small UAVs control scenarios and of the very small UAVs under 66 joules. Based on the analysis, the energy impact analysis can be considered before the design certification approval for the small UAVs.

• 한국항행학회논문지
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• 제19권2호
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• pp.91-97
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• 2015

이 논문은 항공 분야에서의 안전필수 소프트웨어를 평가하기 위한 고려사항을 기술한다. 항공 분야에서의 안전필수 소프트웨어의 평가를 수행하기 위해서는 해당 소프트웨어의 평가 수준에 대한 정보가 필요하다. 그 수준은 표준에 명시되어 있으나 소프트웨어 자체적으로 결정되는 요소가 아니며 시스템 안전 평가 결과 및 시스템 설계 결과에 의존적이다. 그러므로 소프트웨어 평가수준을 결정하기 위해 시스템 개발 및 시스템 안전 평가 표준에서 필요로 하는 정보에 대해 설명한다. 그리고 소프트웨어를 평가하기 위한 기존의 방법론들을 조사하고 항공기 지상 유도 및 통제 시스템 소프트웨어의 평가에 적용할 방법을 제시한다.

• 한국전자통신학회논문지
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• 제14권1호
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• pp.179-184
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• 2019

본 논문에서는 능동 소음 제어기(Active Noise Controller)의 잔류 소음을 청감적으로 감소시키는 설계법을 제안하였다. 이를 위한 구조로는 FELMS(Filtered-E Least Mean Squares) 알고리즘과 소음 평가 지수인 NC(noise criteria)를 사용하였으며, 능동 소음 제어기의 유효 동작 주파수 대역 내에서 NC 지수를 최소화하는 FELMS에 내장된 노이즈 쉐이핑 필터의 스펙트럼 조건식을 도출하였다. 제안한 조건을 만족하는 필터가 기존에 사용되었던 심리음향 기반의 필터보다 더 향상된 NC값을 나타내는 것을 시뮬레이션을 통해 확인하였다.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2005년도 추계학술발표회
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• pp.1055-1056
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• 2005

• 전자공학회논문지B
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• 제32B권10호
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• pp.1259-1268
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• 1995

This note presents the robust root clustering problem of interval systems whose characteristic equation might be given as either a family of interval polynomials or a family of polytopes. Corresponding to damping ratio and robustness margin approximately, we consider a certain class of D-region such as parabola, left-hyperbola, and ellipse in complex plane. Then a simpler D-stability criteria using rational function mapping is presented and prove. Without .lambda. or .omega. sweeping calculation, the absolute criteria for robust D-stability can be determined.