• Nuclear Engineering and Technology
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• 제54권4호
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• pp.1295-1300
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• 2022

There has been increased interest in researching risk perception of radiation to implement successful risk communication, particularly given the recent worldwide nuclear policy movement regarding nuclear energy. This study aimed to investigate characteristics of risk perception among residents living near normally operating nuclear power plants in South Korea by identifying factors associated with risk perception. A survey was conducted with face-to-face interviews for 1200 residents aged 20e84 years by gender- and age-stratified random sampling. Risk perception was associated with trust perception in nuclear safety, but was not highly correlated with benefit perception for utilizing nuclear power. Relatively high risk perception was observed in women, older age groups, and residents not having experience of nuclear-related education or work. This association remained after adjusting for other factors including benefit perception, trust perception, and psychological distress. In addition to these individual characteristics, risk perception was also associated with a residential district's own unique context, indicating that a strategy of risk communication should be developed differently for residents facing nuclear-related circumstances. Given that risk perception can be changed, depending on social values such as safety culture and economic setting, further studies are required to understand the changing characteristics of radiation risk perception.

• Nuclear Engineering and Technology
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• 제53권3호
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• pp.825-832
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• 2021

A simulation-based approach is proposed to study the protective actions taken by residents during nuclear emergencies using cognitive findings. Human perception-based behaviors are not heavily incorporated in the evacuation study for nuclear emergencies despite their known importance. This study proposes a generic framework of perception-based behavior simulation, in accordance with the ecological concept of affordance theory and a formal representation of affordance-based finite state automata. Based on the generic framework, a simulation model is developed to allow an evacuee to perceive available actions and execute one of them according to Newton's laws of motion. The case of a shadow evacuation under nuclear emergency is utilized to demonstrate the applicability of the proposed framework. The illustrated planning algorithm enables residents to compute not only prior knowledge of the environmental map, but also the perception of dynamic surroundings, using widely observed heuristics. The simulation results show that the temporal and spatial dynamics of the evacuation behaviors can be analyzed based on individual perception of circumstances, while utilizing the findings in cognitive science under unavoidable data restriction of nuclear emergencies. The perception-based analysis of the proposed framework is expected to enhance nuclear safety technology by complementing macroscopic analyses for advanced protective measures.

• 대한임베디드공학회논문지
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• 제15권5호
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• pp.227-234
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• 2020

In this paper, we propose wav-U-Net to improve speech enhancement in heavy noisy environments, and it has implemented three principal techniques. First, as input data, we use 128 modified Mel-scale filter banks which can reduce computational burden instead of 512 frequency bins. Mel-scale aims to mimic the non-linear human ear perception of sound by being more discriminative at lower frequencies and less discriminative at higher frequencies. Therefore, Mel-scale is the suitable feature considering both performance and computing power because our proposed network focuses on speech signals. Second, we add a simple ResNet as pre-processing that helps our proposed network make estimated speech signals clear and suppress high-frequency noises. Finally, the proposed U-Net model shows significant performance regardless of the kinds of noise. Especially, despite using a single channel, we confirmed that it can well deal with non-stationary noises whose frequency properties are dynamically changed, and it is possible to estimate speech signals from noisy speech signals even in extremely noisy environments where noises are much lauder than speech (less than SNR 0dB). The performance on our proposed wav-U-Net was improved by about 200% on SDR and 460% on NSDR compared to the conventional Jansson's wav-U-Net. Also, it was confirmed that the processing time of out wav-U-Net with 128 modified Mel-scale filter banks was about 2.7 times faster than the common wav-U-Net with 512 frequency bins as input values.

• Nuclear Engineering and Technology
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• 제53권1호
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• pp.314-321
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• 2021

As Indonesia is rich in natural resources, nuclear power remains a low priority among energy alternatives. However, Indonesia needs to introduce nuclear power to improve the atmospheric environment and to support sustainable economic growth. This study conducted a two-stage survey of logit-probit and analytic hierarchy process to analyze the perception of Indonesian energy policymakers regarding the introduction of nuclear power, the potential for change, and key decision factors. The analysis confirms that the perception of nuclear power is positive and that the willingness to expand nuclear power can improve if negative conditions, such as underdeveloped technology level, foreign aid and assistance, and safety issues are addressed. In addition, it is confirmed that the policy makers consider political/social and environmental factors to be more important for decision-making. The results of this study can give inplications and be used as a key reference for Indonesia's nuclear power policy

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1998년도 제13차 학술회의논문집
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• pp.329-334
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• 1998

This work is concerned with the problem of tracking a maneuvering target. In this paper, an error monitoring and recovery method of perception net is utilized to improve tracking performance for a highly maneuvering tar-get. Many researches have been performed in tracking a maneuvering target. The conventional Interacting Multiple Model (IMM) filter is well known as a suboptimal hybrid filter that has been shown to be one of the most cost-effective hybrid state estimation scheme. The subfilters of IMM can be considered as fusing its initial value with new measurements. This approach is also shown in this paper. Perception net based error monitoring and recovery technique, which is a kind of geometric data fusion, makes it possible to monitor errors and to calibrate possible biases involved in sensed data and extracted features. Both detecting a maneuvering target and compensating the estimated state can be achieved by employing the properly implemented error monitoring and recovery technique. The IMM filter which employing the error monitoring and recovery technique shows good tracking performance for a highly maneuvering target as well as it reduces maximum values of estimation errors when maneuvering starts and finishes. The effectiveness of the pro-posed method is validated through simulation by comparing it with the conventional IMM algorithm.

• 복식
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• 제52권1호
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• pp.89-101
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• 2002

The purpose of this study was to characterize purchase behavior at internet shopping mall and the preference for fashion design through analysis Net generations. The subjects for this sample were teen-agers and university students who had dwelled at pusan and ulsan in south korea. This study had 824 samples who had purchasing of fashion apparels at the internet shopping mall. The sampling data in this survey was analyzed by frequency analysis, factor analysis, T-test, Duncan-test, MANOVA and ANOVA of SPSS WIN package. The results of the study were as follows: 1. It was proved that among 824 individuals, 790(95.9%)individuals uses internet or pc communication and 33 individuals don't use any of them. 35.1% of using internet people have been using that for 1∼2 years. And they used internet for 1∼3 hours in a day(52.9%). And Net generations preferred Internet Shopping Mall because they didn't need to take the troubles of shopping and parking, but at the same time, they seemed to have distrust because they couldn't check the products personally. 2. People who decide to purchase by products and pursuit of information prefer cuffs, collar design, people of pursuit of convenience prefer sleeve, neckline, pants design, people of advertising and pursuit of services prefer cuffs, sleeve, collar, neckline, pants design and color. People who was dependent on perception of danger when they purchase preferred color and pattern. 3. It was proved that purchase attitude for men at internet shopping mall was convenience and for women, advertising and pursuit of services. 1318 teenagers decided to purchase mainly by advertising and pursuit of services at internet shopping mall and semi-adult are less dependent on that factors than 1318 teenagers did. Under high school educational course Net generation was dependent on the factors of advertising and pursuit of services when they purchase at internet shopping mall and above university educational course Net generation decide to purchase by the factors of products and pursuit of information. Also, people whose average income was above 3 million won ware dependent on the factors of advertising and pursuit of services and people whose income was under one million won was decide to purchase by the factors of perception of danger. People whose monthly expenditure on purchase was above 50,000 won ware depend on advertising and pursuit of services more than people whose expenditure was under 50,000 won did.

• 한국의류학회지
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• 제26권1호
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• pp.39-49
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• 2002

The purpose of this study was to characterize the effect of Net fashion value regarding to the factors of purchase-decision at internet shopping mall and the preference for fashion design. The subjects for this sample survey, were junior high school and university students who had dwelled at pusan and ulsan in south korea. This study had 824 samples of each aged from 13 to 24 who had purchasing ability of fashion apparels at the interned shopping mal1. The sampling data in this survey was analyzed by frequency analysis, factor analysis, T-test, LSD-test, MANOVA and ANOVA of SPSS WIN package. The results of this study was as follows; 1. It was proved that advertising, pursuit of services and products, pursuit of information were considered first from Net generations fashion value. Next things were perception of danger and pursuit of convenience. It was proved that they considered it important A/S, recall, exchange and post management. 2. It was proved that there was difference at the preference for fashion design of according to Net generations fashion value. Color was considered to be the most important one. 3. Men had higher political value than women and 1318 teenagers had higher fashion value than semi-adult. Under high school educational course Net generation had more theoretical value than above university educational course Net generation did. Also, with the factor of average monthly income, political value was considered to be the most important. People whose monthly expenditure on purchase was above 50,000 won had higher social value than people whose expenditure was under 50,000 won but under 50,000 won had higher political value than above 50,000 won did.

• International Journal of Human Ecology
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• 제13권1호
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• pp.117-128
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• 2012

This study compares the net effect of wearing different shoulder/arm armor systems on garment impediment perception and wearer acceptability. Two independent variables in this study were armor systems and shoulder/ arm movements. There were four armor systems of control garment and arm armor systems A, B, and C as well as five types of arm/shoulder movements, (shoulder flexion, should extension, shoulder abduction, shoulder horizontal flexion, and shoulder horizontal extension). Ten male volunteers wearing size medium battle dress uniform (BDU) with recent relevant military experience participated in this study. The volunteers performed shoulder/arm movements (while wearing each armor treatments) and completed the garment impediment perception as well as wearer acceptability scales. The body areas of neck side, shoulder top, and armscye front showed the highest frequency of reported impediments. Resistance to movement and localized pressure were the most frequently mentioned types of impediment. The armor system B had the most areas of impediment, and was rated as more restrictive than the control garment and armor system A for each movement. For wearer acceptability, no significant differences were found between the control garment and armor system A for all eight items; this indicated that subjects did not perceive a difference between wearing the control garment and armor system A. There was a trend for wearer acceptability to decrease from wearing the control garment to armor systems A to C to B.

• 한국융합학회논문지
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• 제13권2호
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• pp.1-12
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• 2022

본 연구는 장애 유아에 대한 최근 10년간의 사회적 인식을 알아보기 위해 인터넷 기반의 빅데이터 분석 시스템인 Textom을 활용하였다. Textom으로 수집된 자료는 데이터 클리닝 과정을 거쳐 빈도가 높은 순으로 50개의 키워드가 선정되었으며, 의미연결망 분석을 위해 UCINET6으로 중심성 분석과 CONCOR분석을 실시하였다. 분석된 자료는 NetDraw를 활용하여 시각화하였다. 그 결과 '교육, 요구, 부모, 통합교육' 등의 키워드가 빈도수, 연결 및 위세 중심성에서 높은 순위를 차지하였다. 그리고 매개 중심성은 '부모, 교사, 문제, 프로그램, 상담'이 높은 순위를 차지하였다. CONCOR분석에서는 '장애, 유아, 진단, 프로그램'의 키워드를 중심으로 하는 4개 군집이 형성되었다. 이러한 연구 결과를 바탕으로 장애 유아에 대한 사회적 인식의 주제가 무엇인지 살펴보고, 주제별 시사점을 논하였다.

• 한국측량학회지
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• 제39권3호
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• pp.141-148
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• 2021

본 논문은 SegNet과 ResNet을 조합한 딥러닝을 이용하여 횡단보도를 검출하는 방법을 제안한다. 시각 장애인의 경우 횡단보도가 어디에 있는지 정확히 아는 게 안전한 교통 시스템에서 중요하다. 딥러닝에 의한 횡단보도 검출은 이 문제에 대한 좋은 해결책이 될 수 있다. 로봇 시각 기반 보조 기술은 지난 몇년 동안 카메라를 사용하는 특정 장면에 초점을 두고 제안되어 왔다. 이러한 전통적인 방법은 비교적 긴 처리 시간으로 의미있는 결과를 얻었으며 횡단보도 인식을 크게 향상시켰다. 그러나 전통적인 방법은 지연 시간이 길고 웨어러블 장비에서 실시간을 만족시킬 수 없다. 본 연구에서 제안하는 방법은 취득한 영상에서 횡단보도를 빠르고 안정적으로 검출하기 위한 모델을 제안한다. 모델은 SegNet과 ResNet을 기반으로 개선되었으며 3단계로 구성된다. 첫째, 입력 영상을 서브샘플링하여 이미지 특징을 추출하고 ResNet의 컨벌루션 신경망을 수정하여 새로운 인코더로 만든다. 둘째, 디코딩 과정에서 업샘플링 네트워크를 통해 특징맵을 원영상 크기로 복원한다. 셋째, 모든 픽셀을 분류하고 각 픽셀의 정확도를 계산한다. 이 실험의 결과를 통하여 수정된 시맨틱 분할 알고리즘의 적격한 정확성을 검증하는 동시에 결과 출력 속도가 비교적 빠른 것으로 파악되었다.