• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.43-44
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• 2000

대형선망어선의 효율적인 운항과 조업방법 개선을 위한 기초자료로 활용하기 위하여 2000년 4월 3일~5일 제주도 성산포로부터 북동쪽으로 24mile 떨어진 위치(33$^{\circ}$43'.6N, 127$^{\circ}$09'.1E)에서 동원식품 소속 동원호선단의 선단조업시 레이더 화면에 나타난 어로과정의 영상을 디지털카메라로 촬영하여 플로피디스크에 저장하고, 그때 얻어진 디지털신호를 후처리하여 분석한 결과를 보고한다. (중략)

• The Optical Journal
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• s.127
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• pp.23-28
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• 2010

사진시장에서 포토북의 인기가 뜨겁다. 필름카메라에서 디지털카메라로 세대교체와 함께 한동안 정체되어 있던 사진출력시장에 활기를 불어넣고 있다. 포토북이 이처럼 새로운 트렌드 아이콘으로 주목받게 된 요인은 기존의 앨범과는 또 다른 형태의 사진앨범으로, 디지털 카메라로 촬영한 사진을 나만의 책으로 만들 수 있다는 장점 때문이다. 특히 부모님 환갑잔치, 어린 자녀를 둔 젊은 부부, 연인끼리의 선물과 추억의 아이템으로 친구들과의 추억을 공유하는 우리들만의 추억으로 점점 그 인기를 더하고 있다. 포토북 뿐만 아니라 압축앨범, 포토 갤린더, 포토카드, 엽서, 휴대폰 고리용 미니북, 열쇠고리용 키북 등 다양한 리테일 상품들도 주목받고 있다.

• The Journal of the Korea Contents Association
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• v.10 no.3
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• pp.266-270
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• 2010

In case of the Dental X-ray apparatus, the diameter (or the field size) of the tip of the cone should be less than 7 cm according to the Diagnosis Radiation Equipment Safety Management. However, deviation from the field is not expected to be big as photography is made at close range from the skin. Also, as the size of film or digital detector used in intra-oral photography is $3\times4cm^2$, the size mentioned above can be considered to be much bigger. Furthermore, the patient dose by short-distance photography can not be ignored. Therefore, effect on the patient dose, resolution and image qualty was examined by reducing the cone diameter by 0.5 cm interval. The result showed that the patient dose was reduced and a partial improvement in picture contrast was observed. Therefore, it can be concluded from these results that further investigation may be worthwhile in terms of policy.

• Journal of the Korean Society of Radiology
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• v.81 no.4
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• pp.886-898
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• 2020

Purpose The purpose of our study was to evaluate digital breast tomosynthesis as a breast cancer screening modality for women with gynecologic cancer. Materials and Methods This retrospective study included patients with underlying gynecologic malignancies who underwent screening digital breast tomosynthesis for breast cancer. The cancer detection rate, recall rate, sensitivity, specificity, and positive predictive value (PPV) were calculated. PPV1 was defined as the percentage of all positive screening exams that have a tissue diagnosis of cancer within a year. PPV2 was defined as the percentage of all diagnostic exams (and Breast Imaging Reporting and Data System category 4, 5 from screening setting) with a recommendation for tissue diagnosis that have cancer within a year. PPV3 was defined as the percentage of all known biopsies actually performed that resulted in a tissue diagnosis of cancer within the year. For each case of screen-detected cancer, we analyzed the age, type of underlying gynecologic malignancy, breast density, imaging features, final Breast Imaging Reporting and Data System assessment, histologic type, T and N stages, molecular subtype, and Ki-67 index. Results Among 508 patients, 7 with breast cancer were identified after a positive result. The cancer detection rate was 13.8 per 1000 screening exams, and the recall rate was 17.9%. The sensitivity was 100%, and the specificity was 83.2%. The false negative rate was 0 per 1000 exams. The PPV1, PPV2, and PPV3 were 7.7, 31.8, and 31.8, respectively. Conclusion Digital breast tomosynthesis may be a promising breast cancer screening modality for women with gynecologic cancer, based on the high cancer detection rate, high sensitivity, high PPV, and high detection rate of early-stage cancer observed in our study.

• Progress in Medical Physics
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• v.18 no.3
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• pp.144-148
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• 2007

Current digital radiography systems are rapidly glowing in clinical applications. The purpose of this study was to evaluate the characteristics of a mobile digital radiographic system. The performance of the mobile DR system was evaluated by measuring the modulation transfer function (MTF), noise power spectrum (NPS), and detective quantum efficiency (DQE). Measurements were made on a LISTEM Mobix-1000 generator and a Teleoptic PRA Alpha-R4000 detector. Imaging characteristics were measured for these two systems using the IEC-61267 defined RQA5 (kVp: 74, additional filtration: 21 mmAl) radiographic condition. The MTF at 10% was measured as 2.4 cycles/mm and the DQE(0) values for radiation exposure 0.19, 0.5, and 1.3 mR were measured as 54%, 55%, and 76%, respectively. The NPS curves gradually decreased at high spatial frequencies. This high DQE at low frequencies, may be useful for low frequency information. The results suggested that mobile DR system could be integrated with emergency ambulance system in teleradiologic imaging applications.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.763-764
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• 2017

The use of barcodes in mobile phones has become generalized, and barcodes are widely used in security-sensitive applications, including mobile payment and personal identification. Generally, images photographed by a mobile phone generate geometric distortion due to the shooting angle, resulting in low quality images. Embedding watermark for low quality images makes it difficult to satisfy transparency. To solve such problem, this paper focuses on the technique of embedding barcode images in the image taken by mobile phone and proposes barcode watermarking for protecting mobile-based ownership. The barcode watermark embedded in the image can be used to prove ownership since it is readable by a machine such as illegal copy.

• Journal of Korean Society of Archives and Records Management
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• v.10 no.1
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• pp.7-29
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• 2010

This article intends to establish a creation, management and preservation process of digital oral records. Because oral records is the work that will record memories of survivors, it is necessary of creating, managing and preserving reliable oral records; Oral records is the work that needs cooperations among interviewer, interviewee and cameraman, the formulation of systematic process can be called an essential issues. Moreover creating, managing and preserving digital oral records need the formulation of systematic process. Therefore this article establish creation process and management and preservation process of digital oral records based on examining a generic character of digital oral records.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.1090-1092
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• 2015

IT 기술의 급격한 발전에 따라 다양한 분야에서 자동화가 이루어지면서, 가정 내의 각종 기기들을 유기적으로 결합하여 편리함과 안전 확보를 꾀하는 홈 오토메이션 시스템도 빠르게 실용화되고 있다. 홈 오토메이션 기술을 활용하면 외부에서도 가스 및 전기, 디지털 도어록 등을 제어할 수 있다. 기존의 디지털 도어록은 대부분 비밀번호 입력을 통한 문의 개폐를 지원하므로 보안상의 허점이 있다. 본 논문에서는 사용자가 스마트폰 애플리케이션을 이용하여 디지털 도어록을 원격으로 개폐하고 문 앞의 대상을 감지해 사진을 촬영하고 사용자에게 알림으로써 편리성과 보안 기능이 강화된 스마트 도어록 시스템을 설계하고 구현한다.

• Journal of radiological science and technology
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• v.37 no.3
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• pp.169-175
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• 2014

According to database of medical institutions of health insurance review & assessment service in 2013, 1118 hospitals and clinics have department of radiology in Korea. And there are CT, fluoroscopic and general radiographic equipment in those hospitals. Above all, general radiographic equipment is the most commonly used in the radiology department. And most of the general radiographic equipment are changing the digital radiography system from the film-screen types of the radiography system nowadays. However, most of the digital radiography department are used the film-screen types of the radiography system. Therefore, in this study, we confirmed present conditions of technical items for general radiography used in hospital and research on general radiographic techniques in domestic medical institutions. We analyzed 26 radiography projection method including chest, skull, spine and pelvis which are generally used in the radiography department.

• Journal of the Korean Society of Radiology
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• v.10 no.2
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• pp.109-115
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• 2016

Despite of increasing the use of the digital imaging device in the radiology area, the setting on the optimal irradiation conditions are insufficient. In this study, the exposure dose and image quality by exposure condition of digital radiography device were compared. The exposure doses were obtained by adjusting the exposure condition as 5 steps respectively based on the exposure conditions that are currently used of CR and DR radiography devices. The acquired image has been assessed by 20 medical image professors using the assessment method of the Japanese Society for Tuberculosis Prevent. As a result, in the case of the CR system, the better image quality was obtained in the condition of 120 kVp and 1.5 mAs~2.4 mAs (quality score 91~95.5 points) than standard exposure condition(110 kVp, 3.2 mAs, 86 points). And exposure dose was evaluated as low with $61.3{\sim}98.4{\mu}Gy$ than standard condition($105.11{\mu}Gy$). In DR system, however, the image quality score was higher as 97~98.6 points in the lower tube voltage range (112 kVp, 2.4~3.2 mAs) condition than the standard exposure condition (125 kVp, 3.2 mAs, 91 points). In addition, the exposure dose was $61.5-77.2{\mu}Gy$ lower than standard condition($93{\mu}Gy$). In addition, the exposure dose was low as $61.5-77.2{\mu}Gy$ than standard condition($93{\mu}Gy$). With the results of this study, we confirmed that it is possible to reduce the patient exposure dose with the same image quality by adjusting the optimal exposure condition of digital device.