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광섬유 ROTDR 센서를 이용한 사회기반시설물의 보안에 관한 연구
박형준,고광락,권일범 한국비파괴검사학회 2003 한국비파괴검사학회지 Vol.23 No.2
광섬유 ROTDR(Rayleigh optical time domain reflectometry) 센서를 이용하여 중요 보안 대상체인 사회기반시설물에 침투하는 침입자의 위치와 무게 정도를 탐지할 수 있는 기초 연구를 수행하였다. 넓은 면적을 감지할 수 있는 매설형 광섬유 센서탐지판을 제작하고, 인가된 침입물체의 위치와 무게에 따른 신호특성을 고찰하였다. ROTDR 센서는 펄스 폭이 30 ㎱이고, 광섬유의 길이는 10㎞ 이상이다. 위치탐지오차는 약 3m 이내였으며, 무게에 따른 탐지능력은 20kgf, 40kgf, 60kgf의 세단계를 구분할 수 있음을 알 수 있었다. A detection technique is studied to determine the location and the weight of an intruder into infrasturcture using fiber optic ROTDR(Rayleigh optical time domain reflectometry) sensor. Fiber optic sensing plates buried in sand are prepared to measure the intruder effects. The signal of ROTDR was analyzed to confirm the detection performance. The constructed ROTDR system could be used up to 12 ㎞ at the pulse width of 30 ㎱. The location error was less than 3 m and the weight could be detected into three levels of grade, such as 20 kgf, 40 kgf and 60 kgf.
[P057] A case of atypical fibroxanthoma
( Byoung Yong Koh ),( Won Choi ),( Kyoung Geun Lee ),( Ki Bum Myung ),( Seung Hyun Cheong ),( Hyung Jin Hahn ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1
Atypical fibroxanthoma is uncommon, pleomorphic, and spindle cell cutaneous neoplasm. Clinically, it presents commonly as a solitary red or pink papule or nodule on the head or neck. Exposure to ultraviolet light most likely contributes to the development of it. A 74-year old man presented with about 1.0 x 1.0 cm sized, skin-colored, and intracutaneous nodule on the left elbow with the onset of several years. Skin excisional biopsy was perfomed. Histologically, it revealed well-circumscribed and nonencapsulated highly cellular dermal tumor consisting of proliferation of bizarre spindle cells, epitheloid cells, and multinucleated giants cells. The spindle cells showed pleomorphic and hyperchromatic nucleus and frequent atypical mitoses. CD68 and CD10 stains were positive in spindle cells but CD34, desmin, smooth muscle actin, and S-100 protain were negative. Herein we report a rare case of atypical fibroxanthoma.
[P275] A case of atypical mycobacterial infection
( Byoung Yong Koh ),( Won Choi ),( Kyoung Geun Lee ),( Ki Bum Myung ),( Seung Hyun Cheong ),( Hyung Jin Hahn ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1
Atypical mycobacteria are abundant in soil and water. These skin infections may be acquired by direct inoculation into the skin or by hematogenous spread from a visceral focus. The clinical and pathological manifestations of the infections were variables. The skin lesions were often resembling panniculitis showing multiple subcutaneous nodules. A 77-year-old man presented with erythematous, infiltrated, and tendered nodules on scalp, forehead, both eyebrows, neck, and trunk. Duration of the lesions was over a month. He had a medical history of peripheral neuritis on taking oral corticosteroid and gabapentin. Two specimens were taken from the forehead and neck. Histologically, the specimen from nodular lesion on the forehead showed inflammatory infiltrates of lymphohistiocytes and large and voluminous macrophages. The specimen form nodular lesion on the neck revealed lymphohistiocytic infiltration and spindle cell transformation of macrophages forming a histoid-like lesions in the dermis. AFB stain was positive for numerous acid-fast bacilli in the dermis. Mycobacterial culture was done and it showed no growth for mycobacterium. He was successfully treated with oral clarithromycin 500mg twice a day for over four months. Here, we report a case of atypical mycobacterial infection.
[P348] A case of eccrine porocarcinoma
( Byoung Yong Koh ),( Won Choi ),( Kyoung Geun Lee ),( Ki Bum Myung ),( Seung Hyun Cheong ),( Hyung Jin Hahn ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1
Eccrine porocarcinoma is a rare malignant cutaneous appendageal neoplasm that originates from the intraepidermal eccrine sweat duct. It usually occurs on the pre-existing lesion of benign eccrine poroma. It has propensity to affect the elderly and females. A 57-year old man presented with about 2.0 x 2.0 cm sized verrucous and keratotic nodule with central crateriform ulceration on the left first web space. Histopathological examination revealed cribriform and infiltrating intraepidermal aggregations composed of polygonal or cuboidal malignant cells invading into the dermis. The cells demonstrated conspicuous nuclear atypia with occasional mitosis. Ductal structures are present within the tumor nests. Immunoreactivity for EMA showed positivity within the tumor cells. He was referred to the department of plastic surgery and underwent wide excision and coverage by full thickness skin graft. We report a case of eccrine porocarcinoma
S-82 : Efficacy of cap-assisted colonoscopy, compared to standard colonoscopy
( Dong Jun Kim ),( Hyung Wook Kim ),( Cheol Woong Choi ),( Dae Hwan Kang ),( Su Bum Park ),( Joung Boom Hong ),( Byoung Hoon Ji ),( Seung Jei Park ),( Kyung Won Koh ),( Chang Seok Lee ) 대한내과학회 2013 대한내과학회 추계학술대회 Vol.2013 No.1
Background & Aims: Colonoscopy is an effective procedure for the detection of colon polyps. Early detection and removal of colon adenomatous polyps is important to prevention of colorectal cancer. A few studies showed that cap-assisted colonoscopy (CAC) improved polyp detection rate (PDR) and adenoma detection rate (ADR), but other studies showed different results. We evaluated PDR, ADR, large ADR, small ADR, and ADR of Right sided colon in expert group and trainee group, compared to standard colonoscopy (SC). Methods: Patients who underwent the first screening colonoscopy in Pusan National University Yangsan Hospital (PNUYH) were enrolled. The patients with poor or inadequate Aronchick scale was excluded. In expert group, three expert colonoscopists (more than 2,000 procedures) have performed procedures. In trainee group, twelve trainees have performed procedures. We retrospectively compared PDR, ADR, large ADR (polyp size ≥6mm), small ADR (polyp size ≤5 mm), and ADR of Right sided colon between CAC and SC group. We evaluate same factors between two groups in subgroup (expert and trainee) respectively. Results: A total of 420 colonoscopies were retrospectively analyzed in this study. CAC group is consist of 202 colonoscopies, and SC group is consist of 218 colonoscopies. Although PDR was higher in CAC group, but not significant (93/202 vs. 83/218, p=0.098). ADR was not different between both CAC and SC group (68/202 vs. 60/218, p=0.172). Large ADR was similar (27/202 vs. 21/218, p=0.23). Small ADR was higher in CAC group, but not significant (53/202 vs. 41/218, p=0.068). The ADR of Right-sided colon was higher in CAC group than SC group (49/202 vs. 35/218, p=0.036). Especially, ADR of Right-sided colon of CAC group was significantly higher in trainee group (38/155 vs. 23/173, p<0.01), but it was similar in expert group (11/47 vs. 12/45, p=0.718). Conclusion: CAC did not improve PDR and ADR than SC. But CAC significantly increased ADR of Right sided colon, especially in trainee group.
( Won Choi ),( Byoung Yong Koh ),( Kyoung Geun Lee ),( Ki Bum Myung ),( Hyung Jin Hahn ),( Seung Hyun Cheong ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.2
Background: Photoaged skin is characterized by actinic skin lesions such as wrinkling, elastosis, and premalignant and malignant lesions. Actinic keratosis (AK) is one of the most common precancerous lesions and multiple lesions of actinic keratosis are one of the risk factors of skin cancer. There have been only a few studies to investigate prevalences of actinic skin lesions and compare characteristics between single and multiple lesions in patients with AK. Objectives: The aim of this study was to evaluate prevalences of actinic skin lesions and compare characteristics between single and multiple lesions in patients with AK in Koreans. Methods: We retrospectively reviewed the medical records and biopsy specimens of 61 patients. Results: Frequencies of deep wrinkle, solar elastosis, cutis rhomboidalis nuchae, and senile purpura were higher in the multiple lesions group. The ratio of males to females was 1 : 3.43 and the mean age was 79 years in the multiple lesions group, which were higher than those were in the single lesion group (1 : 1.14, 72 years). The mean duration was longer in the multiple lesions group. Sun protective behavior was more frequent in the single lesion group and occupation of farmer was more common in the multiple lesions group. There was no statistically significant clinicopathologic difference between the two groups. Conclusion: This study would improve our understandings of the characteristics of actinic keratosis with both single and multiple lesions.
광노화 병변의 유병률 조사 및 단일성과 다발성 광선각화증 환자들의 특성 비교: 환자 61명에 대한 후향적 연구
고병용 ( Byoung Yong Koh ),명기범 ( Ki Bum Myung ),한형진 ( Hyung Jin Hahn ),정승현 ( Seung Hyun Cheong ) 대한피부과학회 2017 大韓皮膚科學會誌 Vol.55 No.9
Background: Photoaged skin is characterized by actinic skin lesions such as wrinkling, elastosis, and premalignant and malignant lesions. Actinic keratosis (AK) is one of the most common precancerous lesions, and multiple actinic keratosis lesions are one of the risk factors for skin cancer. Few studies have investigated the prevalences of actinic skin lesions and compared the characteristics of the lesions and the patients with sinle and multiple AK lesions. Objective: The aim of this study was to evaluate the prevalences of actinic skin lesions and to compare characteristics between single and multiple lesions in Korean patients with AK. Methods: We retrospectively reviewed the medical records and biopsy specimens of 61 patients. Results: Frequencies of deep wrinkle, solar elastosis, cutis rhomboidalis nuchae, and senile purpura were higher in the multiple lesions group. The ratio of males to females was 1:3.43 and the mean age was 79 years in the multiple lesions group, both of which were higher than those in the single lesion group (1:1.14, 72 years). The mean duration was longer in the multiple lesions group. Sun protective behavior was more frequent in the single lesion group, and the occupation of farmer was more common in the multiple lesions group. There was no statistically significant clinicopathological difference between the two groups. Conclusion: This study may improve our understanding of the characteristics of actinic keratosis with both single and multiple lesions. (Korean J Dermatol 2017;55(9):580∼587)