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Nickel allergy in patients with ear keloid
( Yeona Kim ),( Kihyuk Shin ),( Woo-il Kim ),( Min-young Yang ),( Won-ku Lee ),( Hoon-soo Kim ),( Hyun-chang Ko ),( Byung-soo Kim ),( Moon-bum Kim ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.2
Background: Keloids are thought to be the result of abnormal wound healing related to inflammation on the reticular dermis. Dermatologists often encounter patients with ear keloid. However, there is a lack of research on factors that can affect the development of ear keloids. Objectives: To investigate the relationship between nickel allergy and ear keloids. Methods: A questionnaire survey and patch test was conducted on patients who attended department of dermatology at Pusan national university hospital between October 2016 and November 2018. Results: A total of 17 patients (mean onset age 21.4) with ear keloids were included. All 17 patients were female. All patients had history of piercing on keloid site and the piercings were made of alloy. In 9 patients (52.9%), keloid was dominant on the posterior surface of the ear noted keloid. Before keloid formation, 10 patients (58.8%) reported inflammatory signs and most patients (88.2%) complained about itching or pain. Half of patients (58.8%) presented positive result of nickel patch test and 4 patients showed positive result of cobalt. Conclusion: In a previous Korean studies, 34% subjects had nickel allergy, while this study found a higher percentage of patients with nickel allergy. Keloid dominant on the posterior surface could explain by earring’s metallic backs made of nickel. These results suggest not only mechanical force but inflammation induced by metal allergy like nickel could contribute the keloid formation.
( Yeona Kim ),( Kihyuk Shin ),( Woo-il Kim ),( Won-ku Lee ),( Gun-wook Kim ),( Hoon-soo Kim ),( Hyun-chang Ko ),( Byung-soo Kim ),( Moon-bum Kim ),( Min-young Yang ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Meralgia paresthetica (MP) is a compression neuropathy of the lateral femoral cutaneous nerve (LFCN). It results pain, paresthesia, and sensory loss within the territory of LFCN. Obesity, diabetes mellitus, pregnancy and injury during surgery are common associated factors. Rarely, neoplasm could be a cause of MP by pressing the LFCN. A 27-year-old man presented with localized burning pain on right antero-lateral thigh for a year. A soft flesh-colored nodule was identified on the same site. He had family history of neurofibromatosis type I. Physical examination showed numerous skin-colored nodules and cafe-au-late macules on trunk compatible with neurofibromatosis. The nodule was excised for pain control. However, pain was persistent even after excision. MRI was done to evaluate the pain. MRI revealed multiple nerve sheath tumors on the pelvic cavity. Especially, 75 X 49 mm sized tumor on showed the findings of malignancy and was considered as the cause of pain. The tumor on the lumbar plexus was excised and histopathologic finding was consistent with malignant peripheral nerve sheath tumor (MPNST). Though, pain was relived after surgery, lung metastasis was found in follow-up CT. He chose hospice care rather than chemotherapy. To our knowledge, MP associated with MPNST arising from neurofibroma has not been reported in the Korean dermatology literature. If neuropathic pain is localized on the thigh, MP might be considered as the entity.
Attitude Control System Design & Verification for CNUSAIL-1 with Solar/Drag Sail
Yeona Yoo,Seungkeun Kim,Jinyoung Suk,Jongrae Kim 한국항공우주학회 2016 International Journal of Aeronautical and Space Sc Vol.17 No.4
CNUSAIL-1, to be launched into low-earth orbit, is a cubesat-class satellite equipped with a 2 m × 2 m solar sail. One of NUSAIL’s missions is to deploy its solar sail system, thereby deorbiting the satellite, at the end of the satellite’s life. This paper presents the design results of the attitude control system for CNUSAIL-1, which maintains the normal vector of the sail by a 3-axis active attitude stabilization approach. The normal vector can be aligned in two orientations: i) along the antinadir direction, which minimizes the aerodynamic drag during the nadir-pointing mode, or ii) along the satellite velocity vector, which maximizes the drag during the deorbiting mode. The attitude control system also includes a B-dot controller for detumbling and an eigen-axis maneuver algorithm. The actuators for the attitude control are magnetic torquers and reaction wheels. The feasibility and performance of the design are verified in high-fidelity nonlinear simulations.
( Yeona Kim ),( Dae-lyong Ha ),( Jin-hwa Son ),( Jung-soo Lee ),( Kihyuk Shin ),( Kyunghyung Seo ),( Hoon-soo Kim ),( Hyun-chang Ko ),( Moon-bum Kim ),( Jun Young Kim ),( Byung-soo Kim ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: Patients with long standing psoriasis who have failed with conventional medicine seek for complementary and alternative medicine (CAM). Biologic revolution in the field of psoriasis since late 2000s has progressed expecting 90%-100% clearance of disease. The frequency and type associated with usage of CAM may have changed after these advances. Objectives: To investigate the change with the use of CAM in Korean psoriasis patients before and after the development of biologics. Methods: From March to June 2020, patients with psoriasis who visited the Pusan National University Hospitals (Busan and Yangsan) filled out a face-to-face structured questionnaire. These results were compared with the results from our previous study done approximately 10 years ago. Results: A total 207 patients were included. Compared with the previous result, the frequency of using of CAM (67.63%) were increased (p<0.0001). Oriental medicine (45.41%) was still been most commonly used, followed by health supplements and bath therapy. The biggest reason for using of CAM was 'to try all potential treatments'. Meanwhile, negative concern about the conventional medicine (13.53%) was significantly decreased (p<0.0001). Conclusion: Although the efficacy of conventional therapies has been increased after the development biologics, CAM usage tends to be more prevalent among Korean psoriasis patients. Therefore dermatologist should recognize the use of CAM to better empathize with their psoriasis patients.
Clinical study of Morbihan disease: analysis of 24 cases
( Yeona Kim ),( Kihyuk Shin ),( Woo-il Kim ),( Min-young Yang ),( Won-ku Lee ),( Hoon-soo Kim ),( Byung-soo Kim ),( Tae-wook Kim ),( Moon-bum Kim ),( Hyun-chang Ko ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.2
Background: Morbihan disease (MD), also known as edematous rosacea, is a rare variant of rosacea that involves chronic erythema and persistent upper-facial swelling. MD is not extremely rare disease, but there is little articles regarding its clinical features and course. Objectives: The aim of this study is to examine the clinical characteristics of MD. Methods: We reviewed clinical photographs, medical records of 24 cases diagnosed as MD visiting Pusan national university hospital (Pusan and Yangsan) since 2010. Results: The mean age of patients was 56 (range: 36-75) years old, and 19 (79%) patients were male. 10 patients (42%) showed unilateral upper-facial swelling. The most common subtype was erythematotelangiectatic rosacea (15, 62.5%), followed by ocular rosacea. No significant correlation was found among the severities of cutaneous finding, eyelid swelling and feature of rosacea. Patients were treated by various modalities (including systemic antibiotics, corticosteroids, isotretinoin etc.). However, only one quarter of patients noted partial and transient improvement. Conclusion: We have analyzed various clinical features of MD, and showed that upper-facial edema of MD and cutaneous rosacea features had no relationships. Our results support that although MD is described as a variant of rosacea, pathomechanism between typical rosacea and MD may be different.
A case of reflex sympathetic dystrophy (RSD) following prosthetic infection
( Yeona Kim ),( Kihyuk Shin ),( Woo-il Kim ),( Min-young Yang ),( Won-ku Lee ),( Gun-wook Kim ),( Hoon-soo Kim ),( Byung-soo Kim ),( Moon-bum Kim ),( Hyun-chang Ko ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.1
Reflex sympathetic dystrophy (RSD), known as complex regional pain syndrome type 1, is usually arises after trauma . RSD is characterized by hyperalgesia, sudomotor change and impaired motor function. Patients complain of changing in skin temperature, color, or swelling of lesion. It can often be misdiagnosed as soft tissue infection, vascular disease, and peripheral neuropathy. A 74-year-old female consulted to our clinic for evaluation for cutaneous infection of the right knee region. She presented with shiny erythematous patch accompany with hyperalgesia, swelling and heating sensation for 8 months. She also suffered motor weakness and knee stiffness. She had past history of repeated prosthetic infection after knee surgery several years ago. However, her symptom didn’t improve after treatment of antibiotics for 8 months. Bacterial culture from blood and skin tissue were both negative for pathogen. Radiologic and additional laboratory findings also showed no evidence of infection. Digital infrared thermal imaging showed localized hyperthermia on the lesion. She was finally diagnosed as RSD based on the above findings, and treated with oral pregabalin. RSD is rarely reported in the dermatologic literature, but it is not uncommon in practice. Therefore, dermatologists should consider the possibility of RSD when symptoms mimic skin infections not responding to antibiotics persist.
A case of unclassifiable phakomatosis pigmentovascularis
( Yeona Kim ),( Woo-il Kim ),( Min-young Yang ),( Won-ku Lee ),( Tae-wook Kim ),( Sung-min Park ),( Hyun-joo Lee ),( Gun-wook Kim ),( Hyun-chang Ko ),( Byung-soo Kim ),( Hoon-soo Kim ),( Moon-bum Kim 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.1
Phakomatosis pigmentovascularis (PPV) can be classified by Classic Hasegawa’s 5 types or new Happle’s 4 types. Though the new Happle’s has some points, it has demerits considering it excluded type I of Classic Hasegawa’s and didn’t cover combined extracutaneous disorders. Classic Hasegawa’s is divided into two subtypes, subtype A and B, based on whether there are only skin manifestations or combined extracutaneous disorders. Although both classifications encompass various congenital skin disorders from keratinocytic, melanocytic, or vascular origin and some extracutaneous disorders, some cases of PPV can’t be classified properly. A 17-month-old female infant presented with brownish macules on left neck, hyperkeratotic brownish plaques on left arm, whitish plaque on right hand dorsum, and erythematous linear patch on both legs. Skin biopsy from each lesion was consistent with agminated lentigines on left neck, epidermal nevus on left arm, connective tissue nevus on right hand dorsum and nevus flammeus on both legs. Discrepancy in the length of extremities was also noted. Therefore, this case was not properly classified by by Classic Hasegawa’s 5 types or new Happle’s 4 types, and so we finally diagnosed her condition as unclassifiable PPV. To the best of our knowledge, there has been no report of PPV with agminated lentigines, epidermal nevus, and connective tissue nevus like this case.