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다중 압력분포 기반의 착석 자세 분류를 위한 CNN 모델 구현
서지윤,노윤홍,정도운,Seo, Ji-Yun,Noh, Yun-Hong,Jeong, Do-Un 한국융합신호처리학회 2020 융합신호처리학회 논문지 (JISPS) Vol.21 No.2
근골격 질환은 착석 자세로 업무 및 학업을 장시간 진행하거나 잘못된 자세 습관으로 발생하는 경우가 많다. 일상생활에서 근골격 질환을 예방하기 위해서는 실시간 착석자세 모니터링을 통해 잘못된 자세를 바른 자세로 유도하는 것이 가장 중요하다. 본 논문에서는 의자에 밀착된 착석 정보를 무 구속적으로 검출하기 위하여 다채널 압력센서 기반의 자세 측정 시스템과 사용자의 착석 자세 분류를 위한 CNN 모델을 제안한다. 제안된 CNN 모델은 착석 자세 정보를 기반으로 압력분포에 따른 사용자의 5가지 자세 분석이 가능하다. 필드테스트를 통한 자세 분류 신경망의 성능평가를 위하여 10명의 피실험자를 대상으로 분류결과에 대한 정확도, 재현율, 정밀도 및 조화 평균을 확인하였다. 실험 결과, 99.84%의 accuracy, 99.6%의 recall, 99.6%의 precision, 99.6%의 F1을 확인하였다. Musculoskeletal disease is often caused by sitting down for long period's time or by bad posture habits. In order to prevent musculoskeletal disease in daily life, it is the most important to correct the bad sitting posture to the right one through real-time monitoring. In this study, to detect the sitting information of user's without any constraints, we propose posture measurement system based on multi-channel pressure sensor and CNN model for classifying sitting posture types. The proposed CNN model can analyze 5 types of sitting postures based on sitting posture information. For the performance assessment of posture classification CNN model through field test, the accuracy, recall, precision, and F1 of the classification results were checked with 10 subjects. As the experiment results, 99.84% of accuracy, 99.6% of recall, 99.6% of precision, and 99.6% of F1 were verified.
배꼽에 발생한 비습진성 피부 질환의 임상 및 조직 소견에 대한 고찰
서지윤 ( Ji Yun Seo ),김안나 ( Anna Kim ),백유상 ( Yoo Sang Baek ),송해준 ( Hae Jun Song ),전지현 ( Jiehyun Jeon ) 대한피부과학회 2021 대한피부과학회지 Vol.59 No.7
Background: Umbilical skin lesions are rare but diverse and are rarely diagnosed by biopsy. Objective: This study aimed to analyze the clinical and histopathological features of umbilical skin lesions that require histopathological investigation and to aid in the diagnosis of diseases in patients with umbilical skin lesions. Methods: We performed a retrospective analysis of the patients who visited Korea University Medical center for umbilical skin lesions between January 2008 and December 2019. Age, sex, clinical features, etiologies, and histopathological features were obtained from the patients’ medical records. Results: In total, 41 cases of histologically confirmed umbilical lesions were observed. There were 29 female patients (70.73%). The lesions included hypertrophic scars (11/41), epidermal cysts (7/41), verruca (6/41), seborrheic keratosis (4/41), nevus (4/41), steatocystoma (2/41), and one case each of endometriosis, hidrocystoma, neurofibroma, soft fibroma, foreign body granuloma, tick bite, and heterotopic gastric mucosa. Conclusion: The most common umbilical skin lesions were hypertrophic scars, probably because of the increasing number of laparoscopic surgeries. Compared to the known trends in other countries, fewer biopsies were performed on the umbilical lesions for the diagnosis of metastatic cancer in this study, which might have been due to the low incidence of advanced gastric cancer and the early detection of cancer through endoscopy and computed tomography scan in Korea. Clinically, changes in treatment modality and diagnostic development can alter the frequency of the previously well-recognized diseases; therefore, medical personnel should be aware of the changing incidence of related diseases. (Korean J Dermatol 2021;59(7):501∼506)
정경묵 ( Kyung Muk Jeong ),서지윤 ( Ji Yun Seo ),송진영 ( Jin Young Song ),전지현 ( Jiehyun Jeon ),송해준 ( Hae Jun Song ),백유상 ( Yoo Sang Baek ) 대한피부과학회 2019 大韓皮膚科學會誌 Vol.57 No.8
Subcorneal pustular dermatosis (SPD), also known as Sneddon-Wilkinson’s disease, is a rare pustular eruption that occurs mainly in middle-aged women and rarely during childhood. Clinically, the pustules are distributed on the trunk and proximal region of the limbs, and cultures of the pustules consistently do not reveal bacterial growth. Histopathology shows subcorneal pustules containing polymorphonuclear leukocytes and chronic progression. SPD is a rare condition, especially in children, and only one case has been reported in Korea. Here, we report a case of 4-year-old girl as an educational case for the diagnosis and treatment of pediatric SPD. (Korean J Dermatol 2019;57(8):488∼491)
정병주(Byung Joo Chun),허순(Soon Huh),서지윤(Ji Yun Seo) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
Nowadays, more improved and complicated design requirements are demanded for RV. Package layout for space efficiency and rear impact protection, as well as controllability and stability, are essential for these kinds of vehicle. A new developed multi-Jink rear suspension system is proposed. A system composed of two upper control links, a single lower link and a trailing can make lower rear side members and rear floor height about 30㎜~50㎜ than competitors, Enlarged interior space and flat floor can be possible, and rear impact protection can be enhanced as well.