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Infrared Thermography Characterization of Defects in Seamless Pipes Using an Infrared Reflector
Heesang Park,Manyong Choi,Jeonghak Park,Jeajung Lee,Wontae Kim,Boyoung Lee 한국비파괴검사학회 2012 한국비파괴검사학회지 Vol.32 No.3
Infrared thermography uses infrared energy radiated from any objects above absolute zero temperature, and the range of its application has been constantly broadened. As one of the active test techniques detecting radiant energy generated when energy is applied to an object, ultrasound infrared thermography is a method of detecting defects through hot spots occurring at a defect area when 15~100 kHz of ultrasound is excited to an object. This technique is effective in detecting a wide range affected by ultrasound and vibration in real time. Especially, it is really effective when a defect area is minute. Therefore, this study conducted thermography through lock-in signal processing when an actual defect exists inside the austenite STS304 seamless pipe, which simulates thermal fatigue cracks in a nuclear power plant pipe. With ultrasound excited, this study could detect defects on the rear of a pipe by using an aluminium reflector. Besides, by regulating the angle of the aluminium reflector, this study could detect both front and rear defects as a single infrared thermography image.
LENS SPACES ADMITTING MINIMAL SYMPLECTIC FILLINGS WITH THE SECOND BETTI NUMBER ONE
Heesang, Park,Dongsoo, Shin Korean Mathematical Society 2023 대한수학회보 Vol.60 No.1
We classify lens spaces with the Milnor fillable contact structure that admit minimal symplectic fillings whose second Betti numbers are one.
P259 : Application of parallel-polarized light(PPL) images with green light in various skin diseases
( Heesang Kye ),( Tae Hyung Ryu ),( In Hyuk Kwon ),( Dai Hyun Kim ),( Jae Eun Choi ),( Soo Hong Seo ),( Young Chul Kye ),( Hyo Hyun Ahn ) 대한피부과학회 2014 대한피부과학회 학술발표대회집 Vol.66 No.2
Background: The characteristics of skin can be analyzed by parallel-polarized light(PPL) photography. PPL image with green light-emitting diodes(LED) show more quantitative difference than white depending on the state of skin. Objectives: To determine skin diseases appropriate for PPL images with green and white LED. Methods: For 10 cases of each disease; acne, atopic dermatitis, nummular eczema, rosacea, seborrheic dermatitis, pruritus and xerotic dermatitis, on every lesion and normal skin, PPL images were taken with green and white LED and converted to CIELAB coordinates. Skin hydration level, disease severities and clinical grading of dryness were evaluated. Results: In atopic dermatitis, severity had correlation with a* (r=-0.67420, p=0.0325) and b* (r=0.67420, p=0.0325) in green LED. In rosacea, dryness of lesion had correlation with severity (r=0.67776, p=0.0154) and L* (r=-0.71758, p=0.0086), a* (r=0.67941, p=0.0151) in green LED. In xerotic dermatitis, severity had correlation with dryness (r=0.98837, p<0.0001) and skin conductance (r=-0.78377, p=0.0073) of lesion. Dryness of lesion had correlation with L* (r=-0.69228, p=0.0265), a* (r=0.69228, p=0.0265) and b* (r=-0.69228, p=0.0265) in green LED. Conclusion: In atopic dermatitis, rosacea and xerotic dermatitis, dryness and skin conductance value had significant correlations with some of L*, a*, b* in green LED, and disease severity. Applied properly, PPL images with green LED could be utilized for evaluation of various skin diseases.
( Heesang Kye ),( Dai Hyun Kim ),( Soo Hong Seo ),( Hyo Hyun Ahn ),( Young Chul Kye ),( Jae Eun Choi ) 대한피부과학회 2015 Annals of Dermatology Vol.27 No.3
Tinea incognito is a dermatophytic infection induced by immunosuppressive agents that lacks the classic features of a typical fungal infection. Although the treatment of tinea incognito is simple and relatively easy, its clinical manifestation varies and can masquerade as various skin disorders, causing misdiagnosis and thus preventing prompt and appropriate treatment. Here, we report an interesting case of tinea incognito occurring after topical steroid administration in an immunosuppressed patient with dermatitis artefacta. A 40- year-old female patient who had been taking systemic glucocorticoid for 4 years for chronic inflammatory demyelinating polyneuropathy presented with itching multiple erythematous erosive lesions on the face and upper chest for 2 months. Initial biopsy produced nonspecific findings. The skin lesion was aggravated and became polycyclic and erythematous; after azathioprine was added, her chronic inflammatory demyelinating polyneuropathy became aggravated. A second biopsy confirmed hyphae in the cornified layer. Complete remission was achieved after admonishing oral terbinafine and topical amorolfine. (Ann Dermatol 27(3) 322∼325, 2015)
Hybrid Urbanscapes of PC Bangs and Their Socio-Spatial Effects on Human Bodies
Heesang Lee(이희상) 대한지리학회 2007 대한지리학회지 Vol.42 No.5
본 논문은 한국에서 피시방으로 불리는 인터넷 카페에 의해 생산된 도시경관의 성격과 함의, 그리고 피시방에서 실제와 가상공간 사이에 혹은 인간과 기계 공간 사이에 존재하는 사이보그로서 인간 육체의 활동과 경계에 대한 그들의 영향을 탐구한다. 두 부분으로 구성되어 있는 본 논문은 먼저 전자 건축 공간으로서 피시방의 거리경관을 조사하고 피시방의 도시 전자 공간을 하이퍼텍스트 공간의 의미에서 제시한다. 그런 다음, 피시방에서 인간-기계 혼성체 혹은 사이보그로서 존재하는 인간 육체에 대한 피시방의 영향을 조사한다. 실제와 가상 공간 사이의 혹은 인간과 기계 공간 사이의 제삼 공간, 경계 공간 혹은 혼성 공간으로서 피시방의 패러독스적 사회-공간적 특징은 다음과 같이 설명될 수 있다. 먼저, 피시방에서 사람들은 한편으로는 가상 공간에서는 이동하지만, 다른 한편으로는 실제 공간에서는 정적이라는 점에서 유목적이고 동시에 정착적인 경관이 나타난다. 둘째, 비록 피시방이 열린 공적인 전자공간으로서 역할을 하지만, 남성주의적인 젠더화된 공간을 형성하면서 보이지 않는 사회적 경계를 갖고 있다는 점에서 열린 공간이면서 닫힌 공간이다. 셋째, 피시방에서 인간 육체의 감각적 경계는 전자 네트워크를 통해 확장되지만, 동시에 그것의 사회적 경계는 자기중심적인 상상의 공간을 통해 수축된다. 그리하여 마지막으로, 피시방은 육화되고 젠더화된 경관을 갖고 있는 사회적 공간일 뿐만 아니라, 인간-기계의 결합의 사이보그 경관을 수반하는 비-장소로 특징지을 수 있다. This paper suggests an inquiry into the characteristics and implications of urbanscapes produced by Internet cafes, widely called PC Bangs in Korea, and their effects on the motions and boundaries of human bodies as cyborgs which exist in between actual and virtual spaces or between human and machine spaces in PC Bangs. The paper, which is organised into two main sections, first investigates the streetscapes of PC Bangs as electronic architectural spaces and suggests the urban electronic space of PC Bangs in terms of hypertext space. Then, it looks at the effects of PC Bangs on human bodies which exist as human-machine hybrids or cyborgs in PC Bangs. The paradoxical sociospatial characteristics of PC Bangs as third, liminal or hybrid spaces between actual and virtual spaces or between human and machine spaces can be explained as follows. Firstly, there appear both nomadic and sedentary landscapes in that people in PC Bangs move in virtual spaces on the one hand, and are static in actual spaces on the other hand. Secondly, both open and closed spaces are shaped in that although PC Bangs act as open or public electronic spaces, they involve invisible social boundaries, forming the gendered space of masculinism. Thirdly, the boundaries of the human body are extended and are shrunk at the same time in that while the sensory boundaries of the body in PC Bangs are extended through electronic networks, its social boundaries are shrunk through the imaginary space of solipsism. Thus and finally, PC Bangs can be characterised not only as social spaces entailing embodied and gendered landscapes, but also as non-places involving the cyborg landscapes of human-machine connections.