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정찬우(Chan Woo Jeong),박상진(Sang Jin Park),김수홍(Soo Hong Kim),이일수(Eil Soo Lee) 대한피부과학회 2001 대한피부과학회지 Vol.39 No.8
Idiopathic calcinosis of the scrotum appears in childhood as multiple, asymptomatic nodules of the scrotal skin that gradually increase in size and number and sometimes discharge a chalky material. Histopathologic examination shows calcific deposits of various sizes that are present in the dermis and often surrounded by foreign body granulomatous inflammation. The pathologic mechanism of this condition is not clear, but there is accumulating evidence for dystrophic calcification of cyst rather than an idiopathic genesis. Here we present a 34-year-old otherwise healthy man who had a 10-year history of multiple, asymptomatic, firm, subcutaneous nodules of the scrotal skin, which sometimes discharged a chalky material. The nodules were completely excised and 45 nodules were observed in the histopathologic examination. In addition to the typical findings of idiopathic calcinosis of the scrotum, seven intact cysts were observed among 45 nodules. Among the seven cysts there were five pilar cysts and two indeterminate cysts with diffusely calcified keratinous content and attenuated walls. A mixture of calcified keratinous material and inflammatory infiltrates was detected. These findings suggest that idiopathic calcinosis of the scrotum may be deriven from the dystrophic calcification of cysts. (Korean J Dermatol 2001;39(8): 887-890)
경제협력개발기구(OECD) 회원국 및 기타 국가들에서 의료서비스와 연계된 피부미용사의 근무형태에 대한 연구
정찬우 ( Chan Woo Jeong ),한승경 ( Seung Kyung Hann ),허창훈 ( Chang Hun Huh ),송해준 ( Hae Jun Song ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.9
In 2008, Korea has enacted new ordinances about the role of estheticians, but this law can be interpreted ambiguously, restricting hiring of estheticians in medical clinics. The purpose of the study is to obtain information about medical-esthetic systems in other countries. We have taken a survey of this object from 30 OECD & Asian countries, and the questionnaires returned from a total of 22 countries (Australia, Austria, Canada, Denmark, Finland, France, Germany, Hungary, Japan, Netherlands, New Zealand, Norway, Portugal, Slovak Republic, Spain, Switzerland, Turkey, United Kingdom, United States, Singapore, Israel, and Thailand), were used for the final analysis. The results are summarized as follows. In most countries, estheticians working independently deal with only healthy, normal skin. In most countries, estheticians working independently have no right to operate any medical instruments. In all 17 countries that returned the questionnaires medical clinics can employ estheticians, and only theses estheticians who belong to the medical clinics can handle the non-invasive medical instruments under the supervision of doctors. In 17 countries that have related legal regulations, nurses, under the control of doctors, can perform wider range of duties in various settings than estheticians. The survey concludes that the duties of estheticians are closely related with medical skin care services and estheticians can perform various non-invasive medical procedures only under the control of doctors. From consulting a variety of medical-esthetic systems in other countries, we propose that the estheticians be allowed to work in medical clinics to provide better medical services for the patients and to make more chances of employment for themselves. (Korean J Dermatol 2008;46(9):1149~1154)
컴퓨터과학 : Drone의 자율주행 및 모듈 개발을 통한 Sensor Network 구축
정찬우 ( Chan Woo Jeong ),김상연 ( Sang Yeon Kim ),오진영 ( Jin Young Oh ),황교석 ( Gyo Seok Hwang ),박종화 ( Jong Hwa Park ) 한국컴퓨터교육학회 2015 한국컴퓨터교육학회 학술발표대회논문집 Vol.19 No.1
드론은 정보 취득이 필요한 탐사 등의 목적에서 지상의 무인 탐사 로봇에 비해 지상의 지형에 영향을 덜 받는 이점이 있다. 하지만 드론은 무게의 제한과 그로 인한 배터리의 용량 제한 문제가 있어 정보 수집 시간에 한계가 있다. 본 연구에서는 드론의 자율주행과 센서 모듈 개발을 통해 센서 네트워크를 구축하여 문제해결 방법을 제시하였다. 자율주행을 통해 직접 드론의 움직임을 제어하기 어려운 상황에서 목적지까지 드론이 비행한 후, 센서 모듈을 투하해, 센서 모듈이 정보를 수집함으로써 드론이 정보를 수집하기 위해 머무는데 소모되는 전력을 최소화하여 활동 범위를 넓히고 동시에 많은 곳의 정보를 취득할 수 있도록 하였다. 본 논문에서 센서 네트워크란 Arduino를 중심으로 드론과 센서 모듈들로 구성된 정보 수집을 위한 네트워크 시스템을 의미한다.
Face & body tightening with threads made of PDO (polydioxanone), etc.
정찬우 ( Chan-woo Jeong ) 대한피부과학회 2021 대한피부과학회 학술발표대회집 Vol.72 No.2
Suture threads are a minimally invasive surgical technique for facial rejuvenation. Its use was initiated by Sulamanidze et al with propylene after Serdev introduced suture with polycaproamide; however, these types of suture increased inflammatory reaction. For correction of the aging face, surgeons are devising more procedures with fewer incisions and shorter postoperative recovery periods. Many of these procedures use absorbable and nonabsorbable sutures in the dermis and subcutis to lift lax skin. The polydioxanone suture is currently a great option for antiaging treatment, because besides the ease of applicability and good results, it also has a low incidence of adverse reactions. Recently, beside botulinum-toxin injections and hyaluronic acid fillers, thread lifts have established themselves as the third column of minimally invasive facial rejuvenation. Most commonly, various threads for this approach are made out of polydioxanone, a material known for decades from application in resorbable sutures. The clinical efficacy and the putative material safety of polydioxanone have fueled the popularity of thread lifts. Thread technique is a minimally invasive method for facial rejuvenation. Various devices for thread treatment using polydioxanone (PDO), etc are popular in aesthetic clinics in Korea. This lecture describes some cases in which polydioxanone threads were used to lift and tighten the patient's face. In this lecture, I will describe a new approach and correct principles of thread procedures in the field of anti-aging treatment. Skin tightening using PDO thread is a safe and effective procedure associated with only minor complications when performed on face and body sites, such as neck, breast, upper arm, axilla, waist, abdomen and knee et al.
정찬우(Chan Woo Jeong),이일수(Eil Soo Lee),여운철(Un Cheol Yeo),박수홍(Soo Hong Park),김명민(Myoung Min Kim),복혜숙(Hae Sook Bok) 대한피부과학회 2000 대한피부과학회지 Vol.38 No.6
Background:An alternative approach to oral PUVA therapy for psoriasis, psoralen bath plus UVA therapy(bath PUVA therapy) that avoids the adverse effects associated with oral PUVA therapy has increasingly been used during recent years. Objective:This study was performed to evaluate the efficacy and safety of bath-8-MOP-UVA therapy in the treatment of psoriasis. Methods:Twenty patients were enrolled in this study after determination of the minimal phototoxic doses(MPD). We evaluated the total treatment number, duration, final UVA dose and total cumulative UVA dose of bath-8-MOP-UVA therapy to reach grade 4 response and categorized each patient into clearing, improvement, or failure groups based on the therapeutic efficacy. We measured the PASI score at two week intervals. Blood samples were obtained from all twenty patients 2 hours after bath-8-MOP and plasma levels of 8-MOP were quantified by a reverse phase high performance liquid chromatography. Results:The following results were obtained from this study. 1. Phototoxicity testing with bath-8-MOP-UVA elicited mean MPD value of 3.5±1.3J/㎠. 2. The mean PASI score at 10 weeks was significantly decreased to 5.8±1.3 from baseline PASI score 20.1±4.3. 3. Among 20 patients, clearing was shown in 13 patients(65%), 6 patients(30%) were improved and 1 patients(5%) showed failure. 4. In clearing and improvement groups, the mean treatment number, duration, final dose of UVA and total cumulative UVA dose reaching grade 4 were 19.3±5.4, 49.9±13.5days, 5.2±1.3J/㎠ and 68.6±30.1J/㎠, respectively. 5. Five patients experienced side-effects. Two patients had intense tan, one withdrawing because of it and the other continued treatment. Three had pruritus that was controlled on oral antihistamines. Phototoxic or other classic adverse effects of oral PUVA therapy, such as nausea, vomiting and headaches, were not observed in any of our 20 patients. 6. All twenty patients had an undetectable plasma 8-MOP level. The lower limit of detection level was 20ng/㎖. Conclusion:Bath-8-MOP-UVA therapy for psoriasis is a very effective and safe alternative to oral PUVA therapy. (Korean J Dermatol 2000;38(6):756~761)