高强度 콘크리트를 充塡한 角形鋼管短柱에 關한 硏究

姜賢植,林書亨 진주산업대학교 2001 산업과학기술연구소보 Vol.- No.8

This paper presents an experimental study on the behavior of square hollow section stub columns filled with high strength concrete (fc=l,000㎏/㎠). Several specimen were tested to investigate the effect of the infilled concrete and the thickness to width ratio on the ultimate strength of stub column. From the test results, the effect of inner concrete on the failure mode, the ultimate strength, initial stiffness and deformation capacity was discussed. As a result of this study, we found that the square section members filled with High strength concrete did not show the confinement effect. The purpose of this study is to evaluate the characteristics of CFT stub columns filled with high strength concrete. It would be the basic data for the design standard of Concrete Filled Tubular structures of our country.

물리교육의 효율적인 교수-학습 지도 방안 : 빛 단원을 중심으로 learning methods of physics education

강현식,박승태,양동익 全北大學校 敎育大學院 1983 敎育論叢 Vol.3 No.-

Teaching physics education, various materials have been used. But many kinds of equipments are not sufficient and their operations are very complecate. On the other hand, it takes a lot of time for preparations. The physical experiments should decide the directions of lectures and motivate the learning students. The most remarkable discovery made by physical science is physical phenomena itself. The central problem in teaching physics today is to establish the principles of physics which consist of the basis of all physical phenomena. And the demonstration experiments are used frequently inside and outside the classrooms, and the operations of experiments are convinient to impulse of interests of students. In order to update the teaching and learning method of physics education effectively, we have studied“LIGHT”in high school's physics using improved method by the experiments though the analysis and investigation of the measuring results.

Cu_2-xCd_xTe-CdTe Heterojunction에 의한 태양전지 제작 및 그 특성 연구

姜鉉植 全北大學校 基礎科學硏究所 1980 基礎科學 Vol.3 No.1

N-type single crystals of "CdTe : I"and "CdTe : In"were grown by bridgmann method and studied on their basic characteristics, i. e. lattics constants and energy band gap were 6.48 A˚, 1.44eV. Also, electrical resistivity, carrier mobility, and carrier concentration were about 10^-2Ω-cm, 300∼400㎠/V sec and about 10^17/㎤∼10^18/㎤. So, above characteristics were satisfied sufficiently to make the solar cell devices. Next, Cu_(2-x)Cd_xTe-CdTe Heterojunction solar cells were made by chemical reaction that was replaced Cd ions of the CdTe crystal to Cu ions of coporous solution at the temperature 95℃, during the 2-minute. Also, their fundamental properties, i.e. J-V characteristics, Voc(open circuit voltage)and J_sc(closed circuit current)vs. photon flux density, Load characteristics and V_oc and J_sc vs. photon wavelength were measured. The resulting efficiency were about 5% according to the photon flux density and about 2.75% by Load characteristics. The Load characteristics were compared to si-solar cells that efficiency was 4.30%. So, we conclude that the Cu_(2-x)Cd_xTe-CdTe Heterojuntion solar cell is excellent one, if we should develop their technology to be made mass product.

오존/초음파에 의한 산업폐수처리 연구

강현식,김성원 대한환경공학회 1999 대한환경공학회 학술발표논문집 Vol.1999 No.4

다신호 VSB 디지털 변복조 시스템에서의 시스템 성능 분석과 근사식 ( System Performance Evaluation and Approximate Result for Multilevel VSB )

강현식,이호경 대한전자공학회 1996 대한전자공학회 학술대회 Vol.1996 No.1

CFT 圓型短柱의 中心壓縮擧動에 關한 硏究

姜賢植 진주산업대학교 2000 산업과학기술연구소보 Vol.- No.7

The use of composite members to improve the compressive strength of steel structure is a practice that has become common nowadays and its efficiency has already been proved by several researches and experiments. The result of concrete filled circular tubular(CFCT) stub column tests is introduced in this paper. The main parameter of this test is the diameter to thickness ratio of circular hollow section. From the test results, the effect of inner concrete on the ultimate strength and the deformation capacity is discussed. The ultimate strength of test result is compared with that of calculated one which is obtained by the SRC design code of Japan, Europe, Korea, USA and Belarus and the simplified method. The purpose of this paper is to investigate the inelastic behavior of CFCT stub column and evaluate the confinement effect of infilled concrete.

PCC를 충전한 강관단주의 중심축압축 거동 ( Behavior of CFT Columns Filled with PCC on Concentrically Compressive Load )

강현식,임서형,문태섭 대한건축학회 2002 大韓建築學會論文集 : 構造系 Vol.18 No.9

金屬眼鏡테의 鍍金에 關한 考察

姜賢植 대구보건대학 1991 대구보건대학 論文集 Vol.12 No.-

Spectacle frames are manufactured from either plastic or metals-usually nickel-silver, monel and high-nickel. The ratio of metal to plastic frames varies with fashion trends. At this writing, it appears that 70 to 80 percent of the frames are of the metal variety. A fairly large percentage of these are gold plated to achieve a yellowish finish. The rest either are nickel, chromium or rhodium plated to realize a white finish. Manufacturers of optical frames started to switch from goldfilled to electroplated gold during the mid-1960s, primarily for cost savings. At that time, they deposited 2~5㎛ of a bright nickel on the nickel-silver substrate to yield a quality finish. After the nickel deposit, the frames were preplated with a gold strike and the gold electroplated topcoat was applied. usually at a thickness of 3 to 5 ㎛. This thickness was sufficient to prevent attack through the gold to the base metal as a result of perspiration or cosmetic by the user. However, towards the mid-1970s, gold thickness sometimes was reduced to less than 1 ㎛ due to the high price of the metal. Pitting of the substrate resulting from perspiration or cosmetic became fairly common, especially in areas where humidity and temperatures were high. Some manufacturers did increase the total gold Thickness to overcome these problems, whereas others chose duplex plating of palladidm-gold alloy topcoated with a layer of hard acid gold to achieve the final desired color. Still others currently are evaluating organic coatings. Many optical frame manufacturers supply goods in a slightly pinkish flesh tone. Because these colors cannot be attained with the acid hard gold baths, these manufacturers must utilized color gold for the final desired tone. Again, the thickness of these color golds is less than 0.2 ㎛ which means they give the final color, and afford corrosion protection and wear resistance.

A Case of Ethosuximide-Induced Aplastic Anemia Successfully Treated with Methylprednisolone Pulse Therapy

강현식,김선형 대한소아혈액종양학회 2018 Clinical Pediatric Hematology-Oncology Vol.25 No.2

Aplastic anemia may develop secondary to environmental exposure to entities such as chemicals, medical drugs, and infectious agents. Fatal complications from antiepileptic medications may occur despite careful and appropriate use. We report the case of a 9-year-old girl with a presenting diagnosis of aplastic anemia following treatment with ethosuximide for absence seizures. Aplastic anemia can now be cured with stem cell transplantation or immunosuppressive therapy. In this case, however, because of the impossibility of bone marrow transplantation and the specific needs of the patient’s parents, three courses of methylprednisolone pulse therapy were administered. Following the therapy, there was improvement in pancytopenia and complete remission in the bone marrow. No adverse side effects of therapy were observed. The authors suggest that methylprednisolone pulse therapy may be a treatment for acquired aplastic anemia.

탄소강과 스테인리스강의 이종강종 용접접합부의 용착금속부 파단내력에 관한 실험적 연구

강현식,김태수 대한건축학회 2021 대한건축학회논문집 Vol.37 No.5

Since STS316L among austenitic stainless steels types contains the less carbon compared to STS316 and exhibits excellent intergranular corrosionresistance and plasticity, it has been used under the welded condition without heat treatment after field welding and seismic performancerequirement. This paper investigated the ultimate strength and weld metal fracture mechanism of carbon steel (SM355) and austenitic stainlesssteel (STS316L) fillet-welded connections with TIG (tungsten inert gas) welding through test results. Main variables of specimens are weld lengthand welding direction against loading. Fracture shapes of specimens were classified into three modes ; tensile fracture, shear fracture and blockshear fracture in weld metal except for specimens with the base metal tensile fracture. Material tensile strength of weld metal satisfied theminimum limitation of austenitic stainless steel weld rod (Y316L) in Korean Industrial Standards(KS). Ultimate strengths were compared accordingto the welding direction and weld length. C2A2TFW series with transverse fillet weld had the highest strength compared with other types(C2A2LFW series with longitudinal fillet weld and C2A2FW series with all round weld) based on identical weld length. It is known that currentdesign specifications such as KDS, AISC, ASCE and AISI underestimated the strength of specimens. 오스테나이트계 스테인리스강중에서 STS316L은 STS316에 비해 적은 탄소를 함유하고 있고 우수한 입계부식 저항성능과 소성변형 능력을 지니고 있기 때문에 현장용접 후에 별도 열처리가 필요없는 용접접합부나 내진성능이 요구되는 부재에 사용되어왔다. 이 논문에서는 실험을 통해 용접구조용 탄소강(SM355)과 오스테나이트계 스테인리스강(STS316L)의 이종강종을 티그용접한 용접접합부에서 최대내력과 파단메커니즘을 조사하였다. 실험체의 주요변수는 용접길이와 하중방향에 대한 용접방향으로 설정하였다. 실험체의 파단형태는 모재의 인장파단된 실험체를 제외하고는 용착금속의 인장파단, 전단파단 및 블록전단파단이 관찰되었다. 용착금속의 재료강도는 KS의 스테인리스강 용접봉(Y316L)의 설계강도를 만족하였다. 주요변수에 따른 접합부 파단강도가 비교되었고 동일용접길이에 대해 하중직각방향 용접선을 갖는 C2A2TFW 시리즈 실험체의 최대내력이 다른 두 시리즈의 실험체 내력보다 높게 나타났다. KDS, AISC, ASCE와 AISI의 현행기준식은 이종강종 용접접합부의 내력을 과소평가하였다.