• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 추계학술대회
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• pp.159-160
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• 2018

본 논문에서는 GPS 센서 정보와 영상정보를 이용한 객체 검지에 대한 개발과 중앙의 제어장치에 전송되는 GPS 센서 정보와 영상정보를 통한 상황관리 모니터링 시스템 개발을 위한 하드웨어 구성 설계에 대해 고려한다.

• 음성과학
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• 제15권2호
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• pp.119-129
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• 2008

The purpose of this study were to develop short form versions of MacArthur-Bates Communicative Development Inventories - Korean and to discuss clinical implications. Two short versions were developed: one for $9\sim17$ month-olds(including 69 words and 17 object manipulation skills) and the other for $18\sim35$ month-olds (including 128 words and 5 grammatical items). Short versions seemed to be representative of full versions and showed developmental validity. Short versions showed concomitant validity with SELSI which is a standardized test for Korean children under 37 month-olds. Norm tables for words and criteria for object manipulation and grammaticality are also provided. M-B CDI-K short versions could be used as a preliminary screening tool to identify Korean children with language impairment economically and efficiently. Cautions using short versions of M-B CDI-K are discussed.

• Child Studies in Asia-Pacific Contexts
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• 제4권1호
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• pp.47-63
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• 2014

The purpose of this study was to develop a screening test for children at risk of reading underachievement and to investigate the effectiveness of the early-stage intervention program. In the first part of the study, we recruited 155 elementary first grade students for a screening test. Phonological deletion, digit naming, object naming, and sound-letter correspondence knowledge of a screening test, all assessed at the beginning of the school year, predicted the reading ability at the end of the school year. In the second part of the study, we analyzed the difference in the reading ability between fourteen children who participated in the intervention program and eighteen non-participating children. Reading ability was assessed by evaluating word recognition, oral reading fluency, reading comprehension, and pseudo-word recognition. The reading ability of intervention group improved more compared to control group, and the difference between two groups accentuated over time. However, final analysis conducted in November revealed that two groups did not differ significantly in oral reading fluency. This suggests that, unlike word recognition and comprehension, fluency might not dramatically improve in a short period.

• 문화기술의 융합
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• 제8권3호
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• pp.571-580
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• 2022

해양침적쓰레기는 유령어업으로 인한 폐어구들로 인해 많은 피해와 쓰레기 추정량 편차 증가 등의 문제를 일으키는 주요 원인이 된다. 본 논문에서는 폐어구 사용량, 유통량, 유실량, 회수량에 대한 실태 파악을 위해 실시간 해양침적쓰레기 감지 인공지능 시스템을 구현하고, 성능 개선을 위한 방법에 대해 연구한다. 실시간 객체인식에 우수한 성능모델인 yolov5모델을 활용하여 시스템을 구현하였고, 성능개선 방법으로는 학습데이터의 '데이터 선별 과정'과 '클래스 세분화' 방법을 적용하였다. 결론적으로 비선별된 데이터셋과 클래스가 세분화된 데이터셋의 객체인식 결과보다 불필요한 데이터를 선별하거나 특징 및 용도에 따라 유사 항목을 세분화 하지 않은 데이터셋의 객체인식 결과는 해양침적쓰레기 인식에 개선된 결과를 보인다.

• 대한의용생체공학회:의공학회지
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• 제28권1호
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• pp.95-101
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• 2007

Recently, small-animal imaging technology has been rapidly developed for longitudinal screening of laboratory animals such as mice and rats. One of newly developed imaging modalities for small animals is an x-ray micro-CT (computed tomography). We have developed two types of x-ray micro-CT systems for small animal imaging. Both systems use flat-panel x-ray detectors and micro-focus x-ray sources to obtain high spatial resolution of $10{\mu}m$. In spite of the relatively large field-of-view (FOV) of flat-panel detectors, the spatial resolution in the whole-body imaging of rats should be sacrificed down to the order of $100{\mu}m$ due to the limited number of x-ray detector pixels. Though the spatial resolution of cone-beam CTs can be improved by moving an object toward an x-ray source, the FOV should be reduced and the object size is also limited. To overcome the limitation of the object size and resolution, we introduce zoom-in micro-tomography for high-resolution imaging of a local region-of-interest (ROI) inside a large object. For zoom-in imaging, we use two kinds of projection data in combination, one from a full FOV scan of the whole object and the other from a limited FOV scan of the ROI. Both of our micro-CT systems have zoom-in micro-tomography capability. One of both is a micro-CT system with a fixed gantry mounted with an x-ray source and a detector. An imaged object is laid on a rotating table between a source and a detector. The other micro-CT system has a rotating gantry with a fixed object table, which makes whole scans without rotating an object. In this paper, we report the results of in vivo small animal study using the developed micro-CTs.

• 한국산학기술학회논문지
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• 제10권1호
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• pp.158-164
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• 2009

웹 카메라를 이용한 실시간 도난 방지 시스템은 움직임 객체를 구분하고 행동에 대한 분석을 통해서 그에 상응한 대응을 실시간으로 하여야 한다. 카메라를 통한 실시간 영상에서 객체의 움직임 검출은 불필요한 잡음, 조명의 변화, 가려짐 현상 등에 따라 정확한 움직임을 검출하는 것이 어렵다. 본 논문에서는 이중카메라와 초음파 센서를 이용하여 특정객체의 정확한 움직임검출을 위한 향상된 검출방법인 실시간 도난방지 시스템을 제안하였다 즉, 초음파 센서를 위치변화 측정을 위한 요소로 사용하였고, 전면과 상단의 카메라의 정보를 통해 특정객체를 지속적으로 추적할 수 있음을 실험을 통해 검증하였다 실험결과 제안한 시스템은 97.4%의 객체 추출률을 얻을 수 있었으며, 객체의 가려짐 현상에서 지속적이고 정확한 추적을 할 수 있었다.

• 한국안전학회지
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• 제34권1호
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• pp.82-89
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• 2019

The importance of aviation safety has been emphasized recently due to the development of aviation industry. Despite the efforts of each country and the improvement of screening equipment, screening tasks are still difficult and detection failures are frequent. The purpose of this study was to examine the effect of feedback on improving signal detection performance applying a Simulated Baggage Screening Program(SBSP) for improving aviation safety. SBSP consists of three parts: image combination, option setting and experiment. The experimental images were color-coded to reflect the items' transmittance of the x-rays and could be combined as researchers' need. In the option, the researcher could set up the information, incentive, and comments needed for training to be delivered on a number of tasks and times. Experiment was conducted using SBSP and participant's performance information (hit, missed, false alarms, correct rejection, reaction time, etc.) was automatically calculated and stored. A total of 50 participants participated and each participant was randomly assigned to feedback and non-feedback group. Participants performed a total of 200 tasks and 20(10%) contained target object(gun and knife). The results showed that when the feedback was provided, the hit, correct rejection ratio and d′ were increased, however, the false alarms and miss decreased. However, there was no significant difference in response criteria(${\beta}$). In addition, implications, limitations of this study and future research were discussed.

• 한국산업보건학회지
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• 제22권1호
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• pp.73-81
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• 2012

Object: The aim of this study is to suggest a list of priority chemicals for the Hazard & Risk Evaluation of Chemicals (HREC) controlled by the Industrial Safety and Health Act (ISHA). Method: Screening assessment was done for 642 chemicals whose exposure threshold limit values were set by the Ministry of Employment and Labor (MOEL). Hazard data were collected from Korea Occupational Safety & Health Agency (KOSHA) and/or other toxicity database. Exposure data were obtained from KOSHA internal database. The hazard and exposure scores of chemicals were listed by order of priority in accordance with GHS classification and exposure index data. Result: From the result of screening risk assessment for 642 chemicals, we extracted a list of 13 priority chemicals for HREC performed by the ISHA. A priority list of 27 chemicals which have carcinogen, mutagen and/or reproductive toxicity but not controlled by the ISHA was suggested for additional evaluation as "chemicals for special management".

• 전자통신동향분석
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• 제35권6호
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• pp.37-47
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• 2020

Today, the volume of international trade by airplanes and ships is rapidly increasing, and the volume of trade over land is expected to increase as inter-Korean relations change. In customs processes, humans inspect using the naked eye; therefore, computer vision technology can be used to assist customs inspectors responsible for X-ray security screening. In particular, because of recent advances in deep learning technology, algorithms for image understanding and object detection performance are improving, and studies on their application to X-ray screening have been published. This manuscript describes trends in artificial intelligence X-ray image-reading technology to detect prohibited items. X-ray inspection AI technology is similar to the Sphinx, which was the guardian of the pyramids in ancient Egyptian mythology.

• 한국콘텐츠학회논문지
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• 제18권11호
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• pp.484-492
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• 2018

본 연구의 목적은 수화물 검사 과제에서 장 복잡성과 위험물품 종류가 탐지율과 반응시간에 미치는 효과를 검증하는 것이었다. 참가자는 C 대학 학부생 62명이었고(남 45.2%, 여 54.8%), 평균 나이는 22.88세였다. 가상 수화물 심사(신호 탐지) 과제를 개발하여 사용하였고 참가자들은 실험에 대한 오리엔테이션과 과제 연습에 참가한 후 본 실험에 참가하였다. 참가자들은 총 200개의 수화물 검사 과제를 실시하였고 40개(20%)가 위험 물품을 포함하고 있었다. 본 연구의 독립변인 중 장 복잡성은 상(20개), 중(14개), 하(8개) 세 수준으로 위험 물품의 종류는 총, 칼, 액체, 그리고 라이터 4가지로 설정하였다. 종속변인은 위험 물품이 있는 이미지 중 표적 신호를 탐지한 비율(%)이었다. 연구 결과 장이 복잡할수록 탐지율이 유의미하게 감소하였고, 반응시간은 증가하였다. 그리고 위험 물품의 종류에 따라 탐지율과 반응시간은 달라지는 것으로 나타났다. 특히 칼의 탐지율이 가장 높았고 반응시간은 가장 짧았으며 액체의 탐지율이 가장 낮고, 반응시간은 길었다. 장 복잡성과 위험 물품의 상호작용 효과 역시 탐지율과 반응시간에 영향을 미쳤다. 칼은 장 복잡성에 영향을 받지 않았고, 라이터와 같이 작은 물품이 장 복잡성의 영향을 가장 크게 받은 것으로 나타났다.