만삭 난관간질부 임신의 1예

홍기남,조태일,이은경,문영환 대한산부인과학회 1981 Obstetrics & Gynecology Science Vol.24 No.2

2008 지방재정,세제의 전망과 운용방향 ; 2008 지역개발정책의 기본방향 -낙후(특수)지역개발사업의 주요변화를 중심으로-

홍기남 한국지방재정공제회 2008 지방재정과 지방세 Vol.1 No.-

압축파괴에너지를 도입한 횡구속 고강도 콘크리트의 응력-변형률 모델

홍기남,심원보 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 논문집 Vol.23 No.1

In this paper, a stress-strain model for high-strength confined concrete is proposed using compressive fracture energy. In the compression test performed by author in Reference [6], an acrylic bar with strain gauges was embedded in the center of the specimen to measure the local strain distribution. It was found from the test that the local strain measurement by this acrylic rod is very effective. The local fracture zone length was defined based on the local strain distribution measured by the acrylic rod. Specifically, it was defined as the length where the local strain increases more than twice of the strain corresponding to maximum stress. In addition, the stress-strain relationship of confined concrete with compressive fracture energy is proposed on the assumption that the amount of energy absorbed by the compressive members subjected to the given lateral confining pressure is constant regardless of the aspect ratio and size. The proposed model predicts even results from other researchers accurately. 본 논문에서는 압축파괴에너지를 이용하여 고강도 구속콘크리트에 대한 응력-변형률 모델을 제안하였다. 참고문헌[5]에서 저자가 실시한 압축실험에는 변형률 게이지를 부착한 아크릴 막대를 실험체의 중앙부에 매립하여 압축부재의 국부 변형률 측정을 시도하였다. 이 아크릴 막대를 이용한 국부 변형률 측정은 매우 효과적인 것으로 나타났다. 압축파괴영역길이는 아크릴 막대로부터 측정된 국부 변형률 분포에 기초하여 정의되었다. 구체적으로, 구속콘크리트의 국소파괴영역길이는 압축강도 발현시의 변형률 의 2배 이상 변형률이 증가하는 영역으로 정의하였다. 또한, 동일한 횡구속압을 받는 압축부재에 흡수된 에너지양은 부재의 형상이나 크기에 관계없이 일정하다는 가정에서 압축파괴에너지를 도입한 구속콘크리트의 응력-변형률 관계를 제안하였다. 본 연구에서 제안된 모델은 본 연구의 실험결과뿐만 아니라 타 연구자들의 실험결과를 대체적으로 잘 예측하는 것으로 나타났다.

수영-스트레스에 의한 腦 Catecholamine 代謝의 變動에 있어서 甲狀腺-機能의 役割에 關한 硏究

洪起男,申炅浩,金炯健,全普權 고려대학교 의과대학 1989 고려대 의대 잡지 Vol.26 No.3

Effects of hyper-and hypothyroidism in the swim-stress(SS) induced changes of plasma corticosterone(CS) level and brain norepinephrine(NE) metabolism were studied in male mice pretreated with 1-thyroxine sodium(4㎎/㎏, i.p. inj. once a day for 5 days; T₄) and propylthiouracil (fed ad lib in 0.01% drinking water for 5 weeks : PTU). The circadian rhythm of spotaneous motor activity was not significantly altered by T₄ and PTU, respectively. The plasma thyroxine level was markedly increased by T₄ but reduced by PTU and the plasma thyrotropin level was markedly increased by PTU but decreased by T₄. The plasma CS level was not changed by PTU but moderately increased by T₄ Clonidine slightly increased the plasma CS level, but the clonidine effect was significantly enhanced by T₄-pretreatment. The brain NE and 3-methoxy-4-hydroxyphenylglycol(MHPG) contents were little affected by T₄ but significantly decreased by PTU. ThE SS-induced increase of plasma CS level was moderately decreased by PTU but increased by T₄. However, clonidine significantly inhibited the SS-induced increase, and the inhibitory effect of clonidine was little significantly affected by PTU and T₄ respectively. The brain MHPG content and MHPG/NE ratio were significantly decreased by clonidine bur increased by SS. THe clonidine-induced decrease of brain MHPG/NE ratio were not altered by PYTU or T₄. The SS-induced, and the inhibitory effect of clonidine was not affected by PTU and T₄ respectively. These results suggest 1) that the alteration of thyroidal function little affects the changes of brain NE in responses to swim-stress, but the stress-induced change of plasma corticosterone level may be somewhat modulated by the thyroidal function, and 2) that the hypothalamo-pituitary-adrenocortical stimulation in response to swim-stress seems to be mediated via hypothalamic noradrenergic activation, and the stress response may inhibited by the agonistic activity of clonidine on the presynaptic α₂-adrenoceptor.

다방향 채널형 단부정착장치를 이용한 CFRP판 보강 RC 보의 휨거동

홍기남,한상훈 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 논문집 Vol.12 No.2

본 논문의 목적은 채널형 단부정착장치를 사용하여 CFRP판으로 보강한 철근콘크리트 보의 구조적 거동을 평가하는 것이다. 총 12개의 시험체를 제작하였으며, 이 중에는 보강판의 효율성을 높이기 위해 채널형단부정착장치를 사용한 시험체와 사용하지 않은 시험체가 있다. 모든 시험체의 단면 크기는 동일하며, 주철근량과 콘크리트의 강도를 변화시켰다. 하중재하는 모든 시험체에서 4점 휨시험으로 진행되었으며, 각 재료의 변형률, 균열, 하중, 및 파괴모드가 시험 중에 측정되었다. 모든 시험체의 시험결과는 변형, 강도, 그리고 파괴모드 측면으로 분석되었다. 실험결과에 대한 분석를 통해서 채널형 단부정착장치를 사용한 RC보는 그 파괴모드가 급작스런 부착파괴에서 변형이나 강도적 측면에서 구조적 성능이 매우 향상된 연성적 파괴모드로 전환되는 것을 확인할 수 있었다. The aim of this paper is to clarify the structural performance of RC beams strengthened with Carbon Fibre Reinforced Polymer(CFRP) plates using channel-type anchorage system. Twelve RC beams were specifically designed without and with a channel-type anchorage system, which was carefully detailed to enhance the benefits of the strengthening plates. All the twelve beams were identical in terms of their geometry but varied in their internal reinforcement, concrete strength. All the beams were tested under four point bending and extensively instrumented to monitor strains, cracking, load capacity and failure modes. The structural response of all the twelve beams is then critically analyzed in terms of deformability, strength and failure processes. It is shown that with a channel-type anchorage system, a brittle debonding failure of a strengthened beam can be transformed to an almost ductile failure with well-defined enhancement of structural performance in terms of both deformation and strength.

석분 슬러지를 사용한 인공골재 콘크리트의 역학특성

홍기남,박재규 한국안전학회 2012 한국안전학회지 Vol.26 No.6

In this study, ambient temperature curing artificial aggregate were developed by using crushed-stone sludge. In order to evaluate the mechanical properties, the artificial aggregate was tested on 7 items. Test results showed that the artificial aggregate mostly satisfied the basic requirements of normal aggregate. The concrete with the artificial aggregate made by weathered rock and granite sludge was tested on the compressive test and flexural test. From the test results, It is confirmed that the concrete with the granite artificial aggregate develope the higher compressive strength than the crushed rock aggregate and the concrete with artificial aggregate concrete have the lower elastic modulus and flexural strength than the concrete with crushed rock aggregate

복합신소재를 이용한 구조물 보수보강설계

홍기남 한국복합신소재구조학회 2020 복합신소재학회논문집 Vol.11 No.4

Uniaxial Compression Behavior of High-Strength Concrete Confined by Low-Volumetric Ratio Lateral Ties

홍기남,한상훈 한국콘크리트학회 2005 콘크리트학회논문집 Vol.17 No.5

Presently, test results and stress-strain models for poorly confined high-strength columns, more specifically for columns with a tie volumetric ratio smaller than 2.0%, are scarce. This paper presents test results loaded in axial direction for square reinforced concrete columns confined by various volumetric ratio lateral ties including low-volumetric ratio. Test variables include concrete compressive strength, tie yield strength, tie arrangement type, and tie volumetric ratio. Local strains measured using strain gages bonded to an acryl rod. For square RC columns confined by lateral ties, the confinement effect was efficiently improved by changing tie arrangement type from Type-A to Type-B. A method to compute the stress in lateral ties at the concrete peak strength and a new stress-strain model for the confined concrete are proposed. Over a wide range of confinement parameters, the model shows good agreement with stress-strain relationships established experimentally.

Lithium과 Chlorpromazine의 腦組織中 Catecholamine 含量과 血漿 Corticosterone値에 미치는 影響

洪起男,千然淑 최신의학사 1984 最新醫學 Vol.27 No.3

FRCM으로 보강된 RC구조물의 화재 안전성에 관한 연구

홍기남,연영모,이수규 위기관리 이론과 실천 2019 Crisisonomy Vol.15 No.1

A concrete lining of a tunnel is spalled due to increasing internal air pressure when exposed to a prolonged fire caused by a car accident. The spalled-off concrete pieces expose steels to high temperature, which leads to their stress loss and eventually the collapse of a tunnel could be collapsed due to the deterioration of concrete and steel. Therefore, a fireproofing material should be applied to protect concrete lining and steel from high temperature. This paper selected a cementitious matrix with EVA polymer and a basalt fiber as the fireproofing materials and evaluated their fire-resistant performance by the RABT-ZTV fire loading tests using a liquefied petroleum gas(LPG). Their levels of depths are used as a test variable(20mm, 30mm or 40mm), and the interior temperatures of concrete, steel, and the cementitious matrix are obtained from embedded K-type thermocouples. Failure mechanism and thermal results of the interior concrete and cementitious matrix are discussed in detail. 고온의 화재에 노출된 터널 내 콘크리트는 폭렬로 인해 박락되게 된다. 충돌 또는 화재와 같은 외부위험으로부터 주철근을 보호하고 있는 콘크리트 커버의 박락은 주철근의 급격한 온도 상승을 일으키며 이는 철근의 응력 손실로 귀결된다. 결국 손상된 콘크리트와 응력이 손실된 강재는 제 역할을다 할 수 없게 되며, 구조물의 파괴로 이어지게 된다. 따라서 화재로 인한 철근콘크리트 구조물의피해를 최소화하기 위하여 내화재료와 같은 보호용 재료개발에 많은 연구가 진행되고 있다. 본 논문에서는 열 전도성이 낮고 충분한 부착강도 및 압축강도를 발현할 수 있는 폴리머 혼입 시멘트계매트릭스와 열 전이성이 낮아 내화성이 우수한 Basalt 섬유를 사용한 내화용 복합체의 내화성능을평가하고자 한다. 내화성능을 실험적으로 평가하기 위하여 5분 이내 최대온도 1,200℃까지 가열할수 있는 RABT-ZTV 화재시나리오를 적용하였으며 보강 두께(20mm, 30mm, 40mm)에 따른 복합체의내화성능을 평가하기 위하여 콘크리트 깊이 방향으로 K 타입 열전대를 설치하여 콘크리트, 주철근및 내화용 시멘트 매트릭스 내부 수열온도를 측정하였다. 실험결과 개발된 폴리머 혼입 시멘트계매트릭스는 400℃이상의 온도에서 내부 잉여수의 기화로 발생한 공극압 및 열응력에 의해 균열이발생하였고, 균열로 인한 매트릭스의 초기 박락이 발생하였다.