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.

CdTe 단결정 반도체의 전기 광학적 특성

강현식 全北大學校 基礎科學硏究所 1981 基礎科學 Vol.4 No.1

Temperature dependence of the band gap and several Interband defect levels of a CdTe; I single crystal which were prepared by Bridgemann method, were evaluated from a series experiment of transmission, photoconductivity, photoluminescence, dark current, and photocurrent variations v.s. light intensity as a function of temperature. The energy band gap were measured 0.61 eV, temperature coefficient β=-4.3×10 exp (-4) eV/^ok by photoconductivity experiments. The interband defect levels, V^-2_cd(0.11eV, β=-1.0×10 exp (-5) eV/^ok), Iodine impurity level(0.012eV at low temperature) and uncertain another level(0.049eV) which were guessed the Oxygen level were observed from above experiments. Also, several, phonon spectrum, LO(0.021 eV), TO_1(0.017eV), and TA_1(0.009eV were observed from photoluminescence experiments in temperature range 38 ^ok∼115^ok.

복합강구조물 설계에 정성분석기법을 적용하기 위한 기초연구

강현식,임서형,박용걸 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 논문집 Vol.10 No.1

강관은 그 효용성. 디자인적인 심미성, 그리고 건축 기술의 발전으로 건설시장에서 주요 부재로 널리 사용되고 있다. 그러나 많은 불확실성과 다양한 변수들을 다루는 강관 접합부 상용 프로그램이 확고하게 정착되어 있지는 않다 본 연구에서는 정성분석 프로그램이 소개되어 있으며 그 분석 결과는 2차원적인 영역으로 결과를 제시해 주고 있기 때문에 많은 경험과 지식이 없는 엔지니어들에게 유용한 자료가 될 것으로 사료된다. 실제로 비렌딜 트러스 설계 예제를 통해 캐나다와 국내 규준, 이론해석 결과와의 비교, 그리고 정성분석 프로그램의 예비 설계 적용 가능성을 확인하였다. Steel hollow section members have been widely used as a major material in the construction market due largely to their efficiency, their aesthetic appeal and to the technical development. But it is true that the commercial Program for dealing with a joint problem using hollow section members is not firmly established due to its uncertain and variable design parameters. The qualitative analysis program developed by using computer is introduced in this study. The results of that analysis are shown in the two-dimensional space in variable ranges and diagrams, so it would be useful to whom have not many experiences and knowledges. It is represented that the differences between Canadian code and the Korean standard for the connections of hollow section members. And It is verified that the software is applicable to the Preliminary design in steel tubular structures.

경피적 도관 배액술과 경화요법으로 치료한 후복막 낭성 림프관종 1예

강현식,김승형,김봉수,강기수,Kang, Hyun-Sik,Kim, Seung-Hyung,Kim, Bong-Soo,Kang, Ki-Soo 대한소아소화기영양학회 2010 Pediatric gastroenterology, hepatology & nutrition Vol.13 No.1

후복막 낭성 림프관종은 양성종양으로 매우 드문 질환이다. 수술적 절제가 원칙이나, 경화요법을 우선적으로 고려할 수도 있다. 9세 남자가 병원 방문 4일 전부터점점 심해지는 복통을 주소로 입원하였다. 혈색소 농도가 입원 당일 12.8 g/dL에서, 입원 3병일째 10.6 g/dL로 감소한 소견이 있었다. 복부 전산화 단층촬영에서 크고 종양내부에 격막이 있는 분엽상의 후복막 낭종($10{\times}9.5{\times}5cm$) 한 개가 좌측 신장 주위 공간에서 관찰되었다. 종양 내부에는 출혈이 동반되어 있었으며, 하장간막정맥이 종양에 의해 둘러싸여져 있었다. 수술적 치료의 위험도가 매우 높을 것으로 판단되어 낭종조영술을 시행하였고, 경피적 도관 배액술과 에탄올 경화요법을 시행하였다. 추적 검사로 시행한 복부 전산화 단층촬영에서 종양의 크기가 현저히 감소된 소견을 보였다. 환자는 퇴원 후 13개월 째 현재까지 낭종의 재발없이 건강하게 지내고 있다. 결론적으로, 수술적 치료의 위험이 높은 후복막 낭성 림프관종이 있는 경우 경피적 도관 배액술과 경화요법을 우선적으로 고려해야 할 것이다. Retroperitoneal cystic lymphangiomas are benign, extremely rare tumors. Although surgical resection is the treatment of choice, sclerotherapy should be considered initially. A 9-year-old boy was admitted due do worsening abdominal pain of 4 days duration. Serial complete blood counts revealed a hemoglobin level of 12.8 g/dL on admission to 10.6 g/dL on hospital day 3. An abdominal computed tomography (CT) scan showed a large, lobulated, septated, retroperitoneal cystic mass ($10{\times}9.5{\times}5cm$) in the left anterior pararenal space with intracystic hemorrhage surrounding the inferior mesenteric vein (IMV). Because of the high operative risk, we performed a tubogram of the cystic mass, percutaneous catheter drainage (PCD), and ethanol sclerotherapy. The follow-up abdominal CT scan showed that the cystic mass had decreased in size. He is well without relapse of the retroperitoneal cystic mass for 13 months after discharge. Sclerotherapy with PCD should be considered as initial therapy for patients with retroperitoneal cystic lymphangiomas at high surgical risk.

Zn_80.1Cd_19.9Te 단결정 반도체의 전기-광학적 성질

姜鉉植,金豊久 全北大學校 師範大學 1982 사대논문집 Vol.8 No.-

Zn_80.1 Cd_19.9 Te single crystal were grown by Bridgmann method, and lattice constant(a_o=6.160A。) was determined from X-ray diffraction. Temperature dependence of the band gap and defect level of the interband have been found for mearurement of transmission, photoconductivity, and dark current at 30°K∼300°K. The energy band gap was 2.157eV and temperature coefficient was -5.3x10^-4ev/°K. Also, a defect level has been found at 0.176 eV.

HALT 장비를 활용한 전력계통 디지털기기의 신뢰성 평가

강현식 한국신뢰성학회 2019 한국신뢰성학회 학술대회논문집 Vol.2019 No.5

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.

Cd_xZn_(1-x)Te 단결정을 이용한 초고속 THz 전자파의 emitter 특성연구 (Ⅲ)

강현식,정길환,김태규,이해익 전북대학교 과학교육연구소 2002 과학과 과학교육 논문지 Vol.27 No.-

Cd_xZn_1-xTe single crystal system is most ideal crystal for ultrawere investigated for ultrafast T-ray emitters, with composition ratio x=0.00, 0.05, 0.10, 0.15, 0.20, and 0.25. We have found that Cd_0.05Zn_0.95Te crystals are best emitters for T-ray generation, also for above all composition ratio x=0.05 crystals, T-ray emitting ability depended on resitivity were investigated. The results is that the crystals greater than 100Ω-㎝ are good emitters. We study on the Azumuthal angle dependence of the (110) plane and could be explane the 3fold symmetric variation of signals. Finally we could show the linearity is above the 10^5.

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

축압을 받는 비렌딜 트러스 설계에 관한 연구

강현식,임서형 진주산업대학교 농업기술연구소 2005 農業技術硏究所報 Vol.18 No.-

강관은 그 효율성 및 심미적 장점으로 건설시장에서의 이용이 확대되어가고 있으며, 그 기술의 발전 또한 괄목할 만하다. 그러나 강관 접합 문제를 다루는 상용 프로그램이 다양한 변수와 불확실성 문제를 해결할 만큼 확고히 구축되어 있지는 않은 실정이다. 컴퓨터를 이용한 정성분석기법 프로그램이 본 논문에 소개되었으며, 그 분석 결과는 다양한 범위의 영역으로 나타내 주기 때문에 많은 지식과 경험이 없는 엔지니어들에게 상당히 유용한 자료가 될 것이다. 강관을 이용한 비렌딜 트러스의 설계 예제를 통해 캐나다 규준과 국내 규준의 차이를 알아보고 이론해석 결과와 실험 결과와의 비교를 통해 그 강관 구조물 설계에 적용 가능성을 보여주었다. Steel hollow section members have been widely used as a major material in the construction market due largely to their efficiency, their aesthetic appeal, and to the technical development. But it is true that the commercial program for dealing with a joint problem using hollow section members is not firmly established due to its uncertain and variable design parameters. The qualitative analysis program developed by using computer is introduced in this study. The results of that analysis are shown in the two-dimensional space in variable ranges and diagrams, so it would be useful to whom have not many experiences and knowledges. It is represented that the differences between Canadian code and the Korean standard for the connections of hollow section members. And It is verified that the software is applicable to the preliminary design in steel tubular structures.