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임성환,구범모,김민아,김승우 대한이비인후과학회 2019 대한이비인후과학회지 두경부외과학 Vol.62 No.7
Malignant melanoma can be classified as both cutaneous and mucosal types. The former comprisesmore than 98% of all melanomas and is related to ultraviolet exposure, whereas the latteroccupies only 1.3%. More than half of mucosal melanoma arises in the head and neck region,and the sinonasal tract is also one of its predilection sites. On the other hand, themetastatic melanoma of head and neck is lower incidence than primary lesion and the unknownprimary site is about two to five percent. Moreover, a lymphatic metastasis to the posteriorneck is a more unusual clinical pattern. A 71-year-old man with a solitary subcutaneousposterior neck mass visited our clinic. He was confirmed with metastatic melanoma in thelymph node through excisional biopsy. However, the primary site was not found with wholeradiologic examinations. We report a very rare disease entity with a brief literature review.
임성환,구범모,박보나,조현상 대한이비인후과학회 2019 대한이비인후과학회지 두경부외과학 Vol.62 No.7
Schwannomas are slow-growing, benign neurogenic tumors arising from the sheath of myelinatednerve fibers. They usually occur in the head and neck region. Only 4% of schwannomasfound in the head and neck region originate in the sinonasal tract. Schwannoma of the nasalseptum is rarer, and only few cases have been previously reported in the literature. Weexperienced a rare case of the schwannoma of the posterior nasal septum in a 71-year-old woman. She was treated successfully by transnasal endoscopic surgery. No recurrence was detectedwithin 18 months follow-up period.
외이도 암으로 오인된 외이도 골부에 발생한 표피 낭종 1예
임성환,구범모,박보나,조현상 대한이비인후과학회 2018 대한이비인후과학회지 두경부외과학 Vol.61 No.12
Epidermal cysts are generally benign tumors that usually originate from the skin caused byinflammation of hair cortex and proliferation of epidermal cells within the dermis; however,for these cysts to occur in the bony external auditory canal (EAC) is rare. They are often presentas a solitary, painless lesion and usually asymptomatic and the diagnosis depends on theresults of the histological examination. In treatment, the cyst wall must be completely removedsurgically. We recently encountered a 82-year-old male with a mass in the right EAC. An otoscopic examination showed a polypoid mass on the bony EAC, which was finally diagnosedas epidermal cyst after an initial misdiagnosis as EAC carcinoma. We report the rare,unique case with literature review.
Development of a Microbial Time-Temperature Integrator System using Lactic Acid Bacteria
임성환,최우영,손병현,홍광원 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.2
A microbial time-temperature integrator (TTI)system was developed using lactic acid bacteria (Weissellakoreensis) obtained from baechukimchi. Activation energy(Ea), which represents the temperature dependence of theTTI response, was calculated using the Arrhenius equation. Ea values for the color change (ΔE value), maximumspecific growth rate (μmax), and pH change of the TTImeasured under different isothermal conditions (5, 10, 15and 20oC) were 99.88, 95.91, and 93.38 kJ/mol, respectively. According to the time taken to reach the TTI endpoint bythe initial inoculum level of W. koreensis (6.2, 5.5, 4.5, and3.4 log CFU/mL), a negative correlation was observed in63.5, 101.8, 115.1 and 166.6 h. In addition, initial bacterialcounts decreased significantly up to almost 4% at 20oC in3 months when W. koreensis viability was measured at thefreezing point of the microbial TTI system (20 and −80oC)for 1 week, 1 month, 2 months, and 3 months. However,viability was about 95% at 80oC. This microbial TTIsystem would be useful to monitor the quality of food withsimilar Ea values during storage or distribution.
임성환,김승우,Lim, Sung Hwan,Kim, Seung Woo 대한후두음성언어의학회 2018 대한후두음성언어의학회지 Vol.29 No.1
Trauma, congenital malformation and aging process can be a cause of the deviation of laryngeal prominence in the thyroid cartilage. Among these, the senility is the most common cause. Usually, ossification in the thyroid cartilage has occurred symmetrically, but the asymmetrical event leads to the shift of laryngeal prominence. Also, such deformity can provoke protrusion of false vocal fold. A 75-year-old man with hoarseness and globus sense in throat visited our clinic. Five years ago, he experienced a blunt trauma on left midline neck and had a concave deformity in the left thyroid cartilage lamina. Laryngoscopic findings revealed a marked protrusion in the left false vocal fold. We performed the laryngeal microsurgery to discriminate the tumorous condition. The pathology revealed non-pathologic mucosa. We report a unique and didactic case with a brief literature review.
임성환 한국 비쥬얼 디자인학회 1998 한국디자인포럼 Vol.3 No.-
After 1970s sales have been focused in the sense that sellers deliver the products as special meanings which reflect their distinctive features rather than they sell the products which only show their physical traits. This change has been resulted from the better understanding of marketing management, emphasis on the importance of the advertising messages, and appearance of new diversified scientific advertising marketing techniques. Therefore the semiotics in the advertisement is very useful area of communication, because we can analyze the culture of consumers, the behavior of consumers and the meaning which lies in the products and advertisement and also because it creates new meaning actively. With this hypothesis the main discourse will show the common meaning of the signs which is created through both of the natural and artificial images, the functions and roles of the signs which deliver messages through media, analysis of their influence in terms of psychological stimulus, tracking the continuous relations between the signs and reason, and the logical background which will help us to produce effective advertising messages based on the data obtained. Accordingly we could measure the effect that the signs influence upon the people's psychology and the process of thinking and we could search the characteristic of signs in group as a common meaning. With the proper usage of signs we also could find the possibility that the effect of delivering messages can be maximized.
풍동실험을 통한 능동위상배열레이더에서 다층레이돔에 작용하는 공기력과 풍압의 실험적 연구
임성환,강광희,최지호,이승호,권순덕,Yim, Sung-Hwan,Kang, Kwang-Hee,Choi, Ji-Ho,Lee, Seung-Ho,Kwon, Soon-Duck 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.1
In this paper, we investigated the sensitivity of aerostatic force coefficients of multi-layer radom in the various wind speeds. The test was conducted in KOCED Wind Tunnel Center in Chonbuk National University, and wind speeds were in the range from 5 m/s to 26 m/s in order to determine the Reynolds number independence. The test results of present multi-layer radom were not affected by the Reynolds number, The maximum positive pressure coefficient was found to be 1.08 at the center of the front of the plane in angle of attack of 0 degree, the maximum negative pressure coefficient was -2.03 at the upper right corner in angle of attack of 120 degree, while maximum drag coefficient was 1.11 in angle of attack of 180 degree.