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가상현실 콘텐츠 산업의 성장 측면에서 반드시 해결해야 할 중요한 과제인 사이버 멀미의 감소는 산업계는 물론 학계에서도 많은 관심의 대상이다. 하지만 사이버 멀미 현상에 대한 오랜 관심과 연구에도 불구하고 해결책은 미흡한 실정이다. 본 논문에서는 사용자가 몰입형 가상현실을 체험할 때 사이버 멀미를 효과적으로 측정할 수 있는 도구를 개발하여 사이버 멀미를 감소시킬 수 있는 방안을 마련함을 목적으로 한다. 먼저 선행 연구에서 사용한 사이버 멀미 측정 방법에서 사이버 멀미에 관련된 공통적인 요인을 분석하여 각각 하위 요소들로 도출하였다. 이를 토대로 몰입형 가상현실에서 효과적인 사이버 멀미 측정 평가도구 모델을 제시하고자한다. 해당 평가 도구 모델을 사이버 멀미 감소는 물론 연구에 참고 되었으면 한다. The decline of cybersickness, an important task that must be addressed in terms of growth of the virtual reality content industry, is a subject of much attention not only in the industrial sector but also in academia. However, despite the long-standing interest in and research on cybersickness, the solution is insufficient. In this paper, the purpose of this paper is to develop a tool to effectively measure cybersickness when users experience immersive virtual reality, and come up with measures to reduce cybersickness. First, the common factors related to cybersickness were analyzed in the method used in the preceding study, and each was derived as a subcomponent. Based on this, we are going to present an effective cybersickness measurement assessment tool model in immersive virtual reality. We would like to refer the assessment tool model to the study as well as to the reduction of cybersickness.
Trichilemmal cysts are cysts of epithelial origin with a distinctive keratinization pattern that simulates that of the human anagen hair follicle between bulge and sebaceous gland and in the sac surrounding catagen hairs. This type of keratinization of the outer root sheath epithelium occurs when it is freed from the internal cover of its inner root sheath. Over 90 percent of trichilemmal cysts occur on the scalp. The others are located on the face, neck and trunk. A 34-year-old female had a solitary, skin-colored nontender subcutaneous nodule on the 5th finger of her right hand. We clinically diagnosed this skin lesion as an epidermal cyst. However, histopathologic examination revealed a stratified squamous epithelium without a granular layer, which corresponded to trichilemmal keratinization. The contents of the cyst consisted ofa homogenous eosinophilic material. The cyst was diagnosed as a trichilemmal cyst. (Korean J Dermatol 2009;47(8):945~947)
Dermatofibrosarcoma protuberans is a slow-growing malignant tumor of soft tissue usually occurring on the trunk or proximal extremities. It commonly affects 20 to 50-year-old persons and measures less than 5 cm in diameter. It starts as an erythematous indurated papule or plaque, and can enlarge over several years. It shows aggressive local invasion but a low rate of distant metastasis. A 63-year-old female presented with a 5-month-history of a rapidly growing cutaneous lesion on the abdomen. Physical examination revealed an 8×10 cm sized, violaceous, polypoid firm mass superimposed on the violaceous to brownish indurated plaque and surrounding nodule. Histopathologic examination showed an infiltrating mass composed of spindle shaped cells that were arranged in a storiform growth pattern within the whole layer of dermis. The cellular mass extended into the subcutaneous fat layer in a honeycomb pattern. The tumor cells were positive for CD-34 stain. Additionally, some areas of tumor showed myxoid change. Magnetic resonance imaging demonstrated a homogenously-enhancing, and protruded mass invading the subcutaneous fat layer. The diagnosis of dermatofibrosarcoma protuberans was established and it was treated by wide local excision. We report a case of giant, polypoid dermatofibrosarcoma protuberans presenting with rapid growth. (Korean J Dermatol 2010;48(4):318~321)
최창민 ( Chang Min Choi ), 조희령 ( Hee Ryung Cho ), 유박린 ( Bark Lynn Lew ), 심우영 ( Woo Young Sim ), 이준영 ( Jun Young Lee ), 안규중 ( Kyu Joong Ahn ), 송해준 ( Hae Jun Song ), 김규한 ( Kyu Han Kim ), 조광현 ( Kwang Hyun Cho ), 이은소) 대한피부과학회 2010 大韓皮膚科學會誌 Vol.48 No.3
Background: Social interests and the prevalence of skin disease have increased rapidly along with social development and improvement of life quality. Information on skin diseases and aesthetics are available through the internet and mass media. However, there have been few studies on the value of this information and the treatment-seeking behavior of patients. Objective: To evaluate the recognition of skin health and diseases in patients who visit dermatology clinics and to improve the role of dermatologists in the process. Methods: From March, 2008, to April, 2008, 1901 patients were asked to complete a questionnaire in 62 dermatologic hospitals. The questions covered: purposes of visiting the clinic; duration of skin disease; treatment-seeking behavior; recognition of the prescribed medicine; compliance and common sense about representative skin problems. Results: Patients visited the dermatologic clinic because of skin disease for 67.39% of patients, esthetic treatment in 22.88% of patients, and both in 9.73% of patients. For visits to a dermatology clinic for skin problems, 61.28% of patients visited a clinic but 38.72% did not. Most (81.38%) patients followed the doctor`s prescription. Most negative responses to prescribed medicine were due to the internet and mass media or wrong information from pharmacists (52.24%). Moreover, patients who learned about skin diseases and prescription medicines through the internet usually lacked compliance and common sense regarding their skin problems. Conclusion: The internet can provide good information about healthy skin and skin diseases, but we have to consider its disadvantages of exaggeration and misbelief. The effects of this tool have been overstated and excessively publicized in comparison to actual established clinical results. Use of the internet may delay diagnosis and decrease compliance. Consequently, dermatologists have to provide correct information to minimize the disadvantages of internet information. Patients who have abnormal skin problems should visit dermatologic clinics to be evaluated and treated appropriately. (Korean J Dermatol 2010;48(3):184~190)
Erlotinib is a low-molecular-weight quinazoline derivative that inhibits the activation of epidermal growth factor receptor (EGFR) tyrosine kinase through competitive binding of the adenosine triphosphate binding domain of the receptor. Patients undergoing anti-EGFR therapy frequently present with cutaneous reactions like a sterile follicular and pustular rash, xerosis, pruritus, paronychia, hair abnormalities and mucositis, which can cause serious discomfort and negatively affect the compliance with anti-EGFR therapy. We report here on an interesting case of hair abnormalities induced by erlotinib (Tarceva(R)) and this presented as eyelash lengthening and hair curling in a 62-year-old woman. (Korean J Dermatol 2011;49(4):382∼384)