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Clinical Analysis of Allergic Rhinitis in Seoul
방진현,김영재,신현수,이봉재 대한비과학회 1996 Journal of rhinology Vol.3 No.2
The incidence and clinical features of allergic rhinitis vary as the way of life changes with the development of industry. The aim of this study is to reevaluate the clinical characteristics of allergic rhinitis in Seoul, Korea. A prospective study using a questionnaire, physical findings and in vivo and in vitro tests results was performed in 1,775 patients with allergic rhinitis living in or around Seoul. Allergic rhinitis was most common in the second decade, while its onset was most common in the first decade. In more than half of patients, nasal obstruction was the chief complaint among four major symptoms. Patients with perennial symptoms exceeded those with seasonal symptoms in number, at a ratio of 3:1. Forty percent of patients had a family history of allergic diseases. The color of the turbinate mucosa was pinkish in most patients and only 21.7% showed typically pale, edematous mucosa. The number of eosinophils in nasal secretion and in blood and total serum IgE level were significantly higher in allergic rhinitis patients compared to nonallergic subjects ; however, the proportion of patients with eosinophilia and high IgE level was low, which represents low sensitivity. The common offending allergens were house dust mites, cat fur, dog hair and mugwort in order of frequency. Most patients revealed positive skin test reactions for multiple allergens and only 6.5% of patients demonstrated pure pollinosis. The predominance of chronic nasal obstruction as a presenting symptom and the pinkish mucosal color indicate that late phase reaction is more important for chronic and persistent symptoms than acute phase reaction. Perennial type of allergic rhinitis far exceeds seasonal type from the view point of both symptomatic seasons and offending allergens. Laboratory test results including eosinophil counts in blood and nasal secretions and serum IgE level could be used only as adjunctive tools due to their low sensitivity.
Alloy 282 초내열합금 모재 및 용접부의 기계적 특성과 미세조직에 미치는 시효열처리 조건의 영향
방진혁,강용준,김남규,서성문,이상훈,송상우,강남현 대한금속·재료학회 2020 대한금속·재료학회지 Vol.58 No.8
The effect of aging heat treatment conditions on the mechanical properties and microstructure of the base and weld metal of Alloy 282 superalloy was investigated. The aging heat treatment conditions employed in this study were as follows: two-steps (1010 °C for 2 hours plus 788 °C for 8 hours) and one-step at 788 °C, 738 °C, and 688 °C for 4 hours. The base metal with the one-step aged condition exhibited lower hardness but longer creep life than that treated with the two-step aged condition. The base metal subjected to the two-step aging exhibited the highest hardness and the shortest creep life, mainly due to the precipitation of Mo-rich M6C-type carbides and coarse γ' (Ni3(Al,Ti)) phase. For the weld metal, regardless of aging heat treatment conditions, creep elongation and life decreased significantly compared to the base metal, due to the coarse effective grain size and inhomogeneous distribution of γ' precipitates.
박만수,방진현,정재걸,이덕희,정승문,류대식 대한영상의학회 2001 대한영상의학회지 Vol.45 No.2
골종은 골막에서 형성된 비정상적으로 치밀한(dense) 돌출성 종괴로 정상적인 골조직을 가지고 있는 양성종양이다. 대부분 두개골이나 안면골(특히 전두동. 사골동)에서 호발한다 외이도에서 생기는 경우는 드물며 외이도에 발생시 외골종과의 감별이 중요하다 외이도 골종은 대개 딱딱하고 통증이 없으며 경(stalk) 혹은 목을 가지고 외이도의 골조직과 연결되어 있다. 저자들은 외이도에 생긴 골종 1예를 경험하였기에 보고 하고자 한다. An osteoma is a protruding mass composed of abnormally dense but otherwise normal bone and arises in the periosteum. It is usually found in the skull or facial bone, most often in the frontal or ethmoid sinuses, rarely occurring in the external auditory canal. The mass is usually hard and painless, and is connected to the osseous canal by its stalk or neck. Differential exestotic diagnosis is important. We report a case of osteoma of the external auditory canal.
프리캐스트 콘크리트 패널 분절 아치 시공을 위한 선설치 앵커의 인발 강도 평가
안진희,임홍재,방진수,전석현 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 논문집 Vol.24 No.2
Precast concrete segment arch system has an economic and construct ability that combined with advantage of precast concrete and arch behavior. A precast concrete segment arch system with outrigger is consisted of segmented precast panels, a steel outrigger rib, and V-strip to connect precast panels with a steel outrigger rib and cast-in-place anchors in precast panels to connect V-strip should have sufficient pull-out capacity to form its arch shape by site lifting for assembled precast panels and outriggers. However, it is difficult to secure its embedment depth due to the relatively shallow thickness of precast panel. It can be also occurred that flexure deformation of precast panels caused by its pull-out behaviors. In this study, pull-out capacity of cast-in-place anchor was examined for construction of precast concrete segment arch system with outriggers. Therefore, a total of 24 precast panel specimens were fabricated to examine pull-out capacities of cast-in-place anchor in precast panels, and installation depth of anchors, diameter of anchors and wire mesh effects for the precast panel were examined. From this pull-out tests, its pull-out capacities and failure modes were evaluated and the type of the cast-in-place anchor applicable to the precast concrete segment panel arch system with outriggers was determined from comparison of the design specification values. 프리캐스트 콘크리트의 장점과 및 석조 아치의 거동을 접목한 콘크리트 패널 분절 아치 시스템은 가설재가 불필요한 시공성을 확보할 수 있는 경제적 시공법이다. 프리캐스트 새그먼트 패널의 연속 배치로 구성된 아치는 인양 및 시공을 위한 V형-스트립 연결부의 선설치 앵커 설치가 필수적이다. 그러나 좁은 폭과 얇은 두께의 콘크리트 패널은 선설치 앵커의 충분한 묻힘 깊이 확보를 보장할 수 없고 앵커 인발 거동 시 패널의 휨변형을 동반하는 등 앵커 저항성능 확보를 위한 콘크리트 패널의 기하학적 영향이 고려되어야 한다. 따라서 본 연구에서는 프리캐스트 패널과 강재 아웃리거로 구성된 아치구조의 제작시 설치되는 선설치 앵커의 인발 강도 평가를 위한 실험 연구를 수행하였다. 이를 위해 실제 아치 시스템과 동일한 크기의 프리캐스트 콘크리트 패널을 제작하였으며, 선설 앵커의 직경, 앵커 묻힘 깊이, 와이어 매쉬 사용 등의 영향에 따라 총 24개 실험체의 선설치 앵커 인발 강도를 측정하였다. 또한 측정 변수에 따른 설계기준강도 확보 및 파괴 모드 평가를 통해 프리캐스트 콘크리트 패널 분절 아치 구조에 적용 가능한 선설치 앵커의 형태를 결정하였다.