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Clinico-dermoscopic features of atypical dermatofibroma
( Haneul Oh ),( Byeong Geun Park ),( Jae Yeong Jeong ),( Tae Jun Park ),( Hwa Jung Ryu ),( Il-hwan Kim ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: Dermatofibroma is a common benign skin neoplasm that is usually easy to recognize, but in some cases its differentiation from atypical dermatofibroma may be difficult. Dermoscopy, which is widely used in recent years, may be helpful in early detection of atypical dermatofibroma. Objectives: To describe the clinical and dermoscopic features of atypical dermatofibroma and to differentiate from typical type. Methods: We retrospectively searched the database of patients from Department of Dermatology, Korea University Ansan Hospital from 2010 to 2019, who had skin biopsy or excision operation with the resulting pathology report of typical and atypical dermatofibroma. Results: Of the 220 patients diagnosed with dermatofibroma, 20 (9.1%) cases were identified as atypical deramtofibroma. In comparison of clinical features, the atypical type was not significantly different from the typical type. However, dermoscopy findings of atypical dermatofibroma showed several distinct features. Peripheral homogeneous pigmentation and central white network pattern was the most common finding, which is only found in 6% of the typical dermatofibroma. Conclusion: Atypical dermatofibroma is clinically difficult to distinguish from the typical counterpart and biopsy is essential for diagnosis. If dermatofibroma is suspected and exhibits uncommon dermoscopy findings, it may be an atypical type and should be treated with caution when treating because of the tendency to recur and metastasis.
A case of HIV-associated psoriasis successfully treated with acitretin
( Haneul Oh ),( Jae Yeong Jeong ),( Tae Jun Park ),( Bo Young Kim ),( Hwa Jung Ryu ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
HIV-associated Psoriasis is more severe, tends to be non-responsive to treatment, and has more limitations on treatment options. However, reports on HIV-associated psoriasis are very rare in Korea. A 22-year-old male patient with a history of three years of HIV infection visited our dermatology clinic because of psoriasis exacerbations. He was diagnosed with psoriasis two years ago and was well controlled with topical steroid/calcipotriol ointment. But skin lesions recently worsened without the decrease in CD4 T-cell count and responded poorly to therapy with a topical ointment. He was on antiretroviral therapy without change, had 391 cells/mm3 of CD4 T-cell count. Because of the impaired immunological status of the patient, acitretin 20 mg daily was started as initial treatment instead of traditional severe psoriasis treatment such as MTX, Cyclosporin. When he visited our clinic a month later, most of the scales and papuloerythematous skin lesions had disappeared. Acitretin 20 mg daily was continued for 2 more months and the patient has not experienced relapse until now. HIV-associated psoriasis is a condition that requires careful treatment selection, because of the high risk of worsening the conditions of an already impaired immune system existing in these patients. we hearin report a case of HIV-associated psoriasis successfully treated with acitretin
A case of primary cutaneous perivascular epithelioid cell tumor (PEComa)
( Haneul Oh ),( Jae Yeong Jeong ),( Sook In Ryu ),( Bo Young Kim ),( Hye Rim Moon ),( Il-hwan Kim ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Primary cutaneous perivascular epithelioid cell tumors (PEComa) are rare, recently described mesenchymal tumors composed of perivascular epithelioid cells. These rare tumors are characterized by the co-expression of melanocytic and muscle markers. A 66-year-old female was referred to our dermatology clinic because of a suspected clear cell neoplasm in excisional biopsy performed at local clinic. According to the patient, the lesion was a 1 cm-sized asymptomatic nodule on her right knee. On histopathological examination, the tumor was a dermal tumor composed of nests of epithelioid cells exhibiting clear cytoplasm and showed involvement of resection margins. In immunohistochemistry, tumor cells were positive for HMB-45, Vimentin and CD-10. These clinical and histological findings were consistent with a diagnosis of primary cutaneous PEComa. Because of the marginal positive lesion, additional excision was performed and no lesion remained in the pathologic report. After a complete excision, the patient has not experienced relapse until now. We herein reported a rare case of primary cutaneous PEComa in a 66-year-old female with diagnosis based on clinical and histologic findings. This case indicated primary cutaneous PEComa is rare but could occur and mimic other cutaneous tumors including clear cell fibrous histiocytoma, claear cell sarcoma and melanocytic neoplasms with balloon cell change.
전하늘(Haneul Jeon),김소연(Soyeon Kim),전동수(Dongsu Jeon),정형진(Hyungjin Jeong),이동훈(Donghun Lee) 대한기계학회 2022 大韓機械學會論文集A Vol.46 No.2
본 논문은 multimodal human-robot interactions를 위해 개발된 지능형 소셜 로봇들의 성능평가를 위한 테스트 벤치 개발에 대하여 기술한다. 로봇과의 자연스러운 physical and emotional interactions에 대한 소비자들의 성능 기대치가 점차 높아지고 있기 때문에, 지능형 로봇은 그 세대가 거듭될수록 요소 인지 및 판단 기능들이 고도화뿐만 아니라 서로 복잡하게 통합되고 있다. 하지만 우리는 이러한 지능형 로봇들의 인지 및 판단을 위한 인공지능기술에 쏟는 노력 대비 지능형 로봇의 성능들을 종합적으로 평가하기 위한 방법 및 기술 분야에는 상대적으로 많은 성과가 없었던 것에 주목할 필요가 있다. 따라서 본 연구에서는 소셜 로봇의 HRI 성능평가를 위한 테스트 벤치 개념을 제안하고, 그 핵심 구성 요소로서 평가지표 및 평가시나리오의 개발에 주목하고자 한다. 테스트 벤치는 최대 2인의 피험자와 통합 HRI 기능을 탑재한 로봇 원형 Cube의 위치 및 자세를 실시간으로 측정할 수 있는 모션 캡쳐 시스템 및 운영/결과 분석을 위한 운영 콘솔로 구성된다. 피험자 인식/재인식, 피험자 및 소리 종류와 위치 추정과 관련된 5가지 성능지표를 제시하고 최종적으로 Cube의 인식 및 판단 견실성을 가늠할 수 있다. 결론 부분에서 시나리오별 성능의 종합적 평가 결과 및 소셜 로봇의 성능 개선 방향을 제시한다. This study describes the development of a test bench for the performance evaluation of intelligent social robots developed for multimodal human-robot interactions (HRI). As consumers" performance expectations for natural physical and emotional interactions with robots are gradually increasing, the generation of intelligent robots continues. Currently, the cognitive and judgment functions are not only advanced, but also complexly integrated with each other. However, there has been relatively little achievement in the field of methods and technologies for comprehensively evaluating the performance of intelligent robots compared to the efforts devoted to artificial intelligence technology for cognition and judgment of these intelligent robots. Therefore, the concept of a test bench for evaluating the HRI performance of social robots is proposed in this study with a focus on the development of evaluation indicators and evaluation scenarios as the key components. The test bench consists of a motion capture system that can measure the position and posture of a robot Cube equipped with integrated HRI functions with up to two subjects in real time, and an operating console for operation/result analysis. Five performance indicators related to subject recognition/re-recognition, subject and sound type and position estimation are presented, and finally the reliability of the Cube recognition and judgment can be evaluated. In conclusion, the comprehensive evaluation results of the performance for each scenario and the direction of improvement of social robot performance are presented.