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정지훈,이창희,손승현,정주혜,정신영,이상우,이재태,안병철 대한핵의학회 2017 핵의학 분자영상 Vol.51 No.2
Purpose Although Sjögren’s syndrome (SS) is the most commondisease causing xerostomia, autoimmune thyroid diseasescan also affect the salivary glands. The aim of our studywas to estimate the prevalence of thyroid diseases (TD) insubjects with symptoms of xerostomia and evaluate the efficacyof salivary gland scintigraphy (SGS) in the detection ofTD in patients with SS and without SS. Methods We retrospectively reviewed the SGS findings of173 subjects (men:women, 29:144) with symptoms ofxerostomia. Ejection fractions (EF) in the parotid and submandibularglands were calculated. Thyroid disease was diagnosedon the basis of the results of the visual assessment oftracer uptake in the thyroid gland on SGS images as well asserological thyroid function tests. Results Based on theAmerican-European Criteria, 94 patientswere diagnosed with SS. Hashimoto’s thyroiditis was diagnosedin 63 patients, subacute thyroiditis in 23, subclinicalhypothyroidism in five, and Graves’ disease in one. Therewere significant differences in the EF values of the parotidand submandibular glands between patients with TD andthose with undetermined diagnoses. Conclusions More than half of patients with xerostomia exhibitedTD. Thyroid assessment by SGS is feasible, and SGSappears to be useful for the patients with xerostomia caused byTD. SGS may be the first imaging modality capable of evaluatingboth salivary gland function and thyroid gland status inpatients with xerostomia. This strategy would make the requirementfor additional workup for thyroid disease.
정다운(Daun Jeong),정성훈(Jeong Seong-Hun),김재윤(Jaeyun Gim),정지훈(jihoon Jung),공경보(Kyeongbo Kong) 한국방송·미디어공학회 2022 한국방송공학회 학술발표대회 논문집 Vol.2022 No.11
최근 인공지능 기반 객체 탐지 기술이 발전함에 따라 영상 감시, 얼굴 인식, 로봇 제어, IoT, 자율주행, 제조업, 보안 등 다양한 분야에 활용되고 있다. 이에 본 논문은 발전된 객체 탐지 알고리즘을 이용하여 비전문가에겐 생소한 컴퓨터나 전기 장치 등의 단자(terminal) 모양을 구별하는 방법을 제안한다. 이를 위해 객체 탐지 프로그램인 You Only Look Once (YOLO) 알고리즘을 이용하여 입력한 단자들의 모양을 검출하는 알고리즘을 구성하였다. 일상에서 쉽게 볼 수 있는 단자들의 이미지(VGA, DVI, HDMI, DP, USB-A, USB-C)를 라벨링하여 데이터셋을 구축하였고, YOLOv4와 YOLOv5 두 버전의 알고리즘을 사용하여 성능을 검증하였다. 실험 결과 mean Average Precision(mAP) 기준 최대 92.9%의 정확도를 얻을 수 있었다. 전기 장치에 따라 단자의 모양이 다양하고, 그 종류 또한 많기 때문에 본 연구가 방송 기술 등의 여러 분야에 응용될 것으로 기대된다.
무기체계 개발을 위한 한국형 국방 RMF 구축 방안 연구
안정근,조광수,정한진,정지훈,김승주 한국정보보호학회 2023 정보보호학회논문지 Vol.33 No.5
Recently, various information technologies such as network communication and sensors have begun to be integrated into weapon systems that were previously operated in stand-alone. This helps the operators of the weapon system to make quick and accurate decisions, thereby allowing for effective operation of the weapon system. However, as the involvement of the cyber domain in weapon systems increases, it is expected that the potential for damage from cyber attacks will also increase. To develop a secure weapon system, it is necessary to implement built-in security, which helps considering security from the requirement stage of the software development process. The U.S. Department of Defense is implementing the Risk Management Framework Assessment and Authorization (RMF A&A) process, along with the introduction of the concept of cybersecurity, for the evaluation and acquisition of weapon systems. Similarly, South Korea is also continuously making efforts to implement the Korea Risk Management Framework (K-RMF). However, so far, there are no cases where K-RMF has been applied from the development stage, and most of the data and documents related to the U.S. RMF A&A are not disclosed for confidentiality reasons. In this study, we propose the method for inferring the composition of the K-RMF based on systematic threat analysis method and the publicly released documents and data related to RMF. Furthermore, we demonstrate the effectiveness of our inferring method by applying it to the naval battleship system.
2014-2015년 동아시아의 기록적인 다년간 가뭄의 물리적 메커니즘
함유근,강선유,정예림,정지훈,Tim Li 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
2014-2015년에 한국에서 다년간의 가뭄이 발생하여 사회적⦁경제적으로 극심한 피해를 입었다. 한국에서 발생한 다년간의 가뭄 메커니즘을 연구한 결과, 북태평양의 Pacific Meridional Mode (PMM)에 관련된 해수면 온도 패턴이 원인으로 나타났다. 2014년 봄부터 2015/16년 겨울까지 약 2년 동안 양의 PMM 위상과 비슷한 패턴의 쌍극자 해수면 온도 아노말리가 지속되었다. 이러한 양의 PMM 기간 동안 지속된 아열대 지역의 길게 뻗은 말굽 모양의 양의 해수면 온도 아노말리 패턴은 한국의 다년 가뭄 유지하는 데 중요한 역할을 하였다. 아열대 중앙 태평양의 해수면 온도 상승은 대기의 비단열 가열을 강화하여 북태평양 서부에 대규모 저기압성 순환을 유발하였다. 대규모 저기압성 순환의 서쪽 가장자리에 있는 북풍으로 인해 한국에 건조한 공기가 유입되면서 강수량이 감소하고 이에 따라 표준강수 지수(SPI)의 음의 아노말리가 2년 동안 지속되었다. 기후 모델 대규모 앙상블 장기 적분 시뮬레이션 실험에서도 PMM과 관련된 해수면 온도의 상승이 동아시아의 다년간 가뭄 발생에 영향을 끼치는 것으로 나타났다. 2015/16년 겨울철에 양의 PMM 현상이 쇠퇴하는 한편, 슈퍼 엘니뇨가 절정에 이르게 되어 필리핀 고기압을 강화하였다. 이로 인해, 남풍이 유도되어 한국에 습한 공기가 유입됨으로써, 다년간의 가뭄이 종료되도록 유도한 것으로 나타났다.
손승현,이창희,정지훈,김춘영,정주혜,정신영,이상우,이재태,안병철 대한갑상선학회 2017 International Journal of Thyroidology Vol.10 No.1
Background and Objectives: The level of thyroid-stimulating hormone (TSH)-stimulated thyroglobulin (Tg) after thyroid hormone withdrawal (THW) is the most sensitive marker for detecting recurrence of differentiated thyroid cancer (DTC). In DTC, Tg production is regulated by TSH; however, TSH values after THW are never identical, even in the same patient. The objective of this study was to evaluate the influence of TSH on Tg levels after THW. Materials and Methods: TSH and Tg concentrations were measured twice at 2 and 3 weeks after THW in 309 patients with DTC. TSH and Tg levels at these time points were compared. The percent change in TSH (ΔTSH) and change in Tg level (%ΔTg) from 2 to 3 weeks after THW were calculated, and Pearson's correlation coefficients were calculated to determine whether ΔTSH could affect %ΔTg. Tg cutoff value for diagnostic imaging was 2 ng/mL. Results: The TSH and Tg values at 3 weeks were significantly higher than those at 2 weeks after THW. Tg values increased significantly to >2 ng/mL after 1 week in 38.5% of the patients with Tg values of 0.2-2 ng/mL at 2 weeks after THW. In patients with Tg values ≥2 ng/mL at 2 weeks after THW, Tg values increased significantly after an additional week of THW. ΔTSH correlated significantly with %ΔTg. Conclusion: TSH values differed according to time after THW, and Tg values differed significantly according to TSH values. Therefore, TSH values should be considered carefully when interpreting the meaning of Tg levels in patients with DTC.
임민철,박재윤,정지훈,김봉수,김영록,정운용 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.5 No.5
We comprehensively investigated the wrinkles of a stiff layer covering a spherical void embedded in a rubber matrix after the void experienced inflation or contraction. We developed an easy experimental way to realize the inflation and contraction of the voids. The inflation took place in a void right beneath the surface of the matrix and the contraction happened in a void at the bottom of the rubber matrix. In the inflation, the wrinkle at the center of the deformation was random, and the pattern propagated into rabyrinthine, herringbone, and then oriented parallel lines as the position was away from the center of the inflation to the edge. The cracks were concentric, which were perpendicular to the parallel wrinkled pattern. In the contraction, the wrinkle was simply concentric around the surface of the void without any crack. The cracks were found only near the center of the deformation. The strain distribution in the stiff layer after the inflation and contraction was theoretically analyzed with simulations that were in excellent agreement with the experimental results.