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황원주 ( Hwang Won Ju ),김종우 ( Kim Jong Woo ),하상수 ( Ha Sang Su ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
The purpose of this experimental study is to increase the strength of mortar mixed with activated Hwang-Toh (AHT) and granulated blast furnace slag (GGBS) as a compound for the development of eco-friendly concrete. The compressive strength test was carried out by making mortar specimens with a certain ratio of AHT and GGBS. The percentage of AHT were at 30% and 50% and the GGBS were a 40% and 50% as Major variables. The results of this study showed that for specimens with percentage of AHT at 30% with GGBS increased above the strength of the mortar without the binding. However, the compressive strength of experimentation with percentage of AHT at 50% with partially replace GGBS has decreased by more than the mortar without the binding. Therefore, further study is deemed necessary.
황경층,윤종호,최재하,김성청 충북대학교 산업과학기술연구소 2002 산업과학기술연구 논문집 Vol.16 No.2
As the machine tool industry progresses, the performance of cutting tools also needs to be of good quality and specialized. If the existing metal cutting tool tip is coated properly, its life would be longer and the machining of a difficult-to-cut material also could be possible. For the development of the high quality cutting tool, the applicabilities of TiCN coating deposited by PVD on the cutting insert were experimentally investigated. The various analyses such as SEM micrograph, XRD pattern, AFM surface morphology, and hardness were performed to cross-check the possibility and availability of TiCN coated tool in the field.
황진하,박종회,김주한 충북대학교 건설기술연구소 2004 建設技術論文集 Vol.23 No.1
The structural system identification using neural networks is presented in this study. Among the neural networks, backpropagation neural network is adopted to fulfill the damage assessment. When the damages occur, the structural responses are changed and the responses contain the damage locations and extents. The static displacements of the truss structure are induced by the various damage states under the static load. In the neural networks the displaces are the inputs and the damage locations and extents are the outputs. The simulation informs that it is efficient to apply the neural network to the damage detection.
해상 유류 유출 사고 후, 유류 해양 오염에 따른 주요 해산 어ㆍ패류내 PAHs 추적
황인영,박정규,박관하,김정상,정흥배,배철한 한국환경독성학회 2001 환경독성보건학회지 Vol.16 No.2
Marine organisms such as fish (Sebastes schlegeli) and mussels were cultured in sea water tanks placed at Dukpo area which was contaminated by the two oil spill accidents. Results showed that PAHs concentrations in fish tissue were higher than in fish liver. This was explained by the cytochrome P450 IA induction in fish liver after PAHs exposure. Other studies showed that higher PAHs levels were detected in mussels cultures in oil contaminated area than in control site. From these results, we concluded that Dukpo area is still polluted by oil including PAHs and it takes a long time to recover of oil contamination after the oil spill accidents.
황진하,박종희,정진덕,김주한 충북대학교 건설기술연구소 2003 建設技術論文集 Vol.22 No.2
A conceptual design for the development of a remote structural monitoring system is presented in this study. First of all, to satisfy the engineering and customer requirements, requirements/functional analysis for the remote structural monitoring systems are performed in context of the systems approach. The problem definition is given, And the market competitors are analyzed by benchmarking and the alternatives are evaluated. Based on the informations from the above stage, the key elements of the systems are extracted through the functional decomposition and the schematic specifications are described.
황경충,윤종호,최재하,김성청 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.4
Inconel 690 alloy has widely been used in power plant and high temperature facilities because it has high thermal resistance and toughness. But, we have little design data about the creep behaviors of the alloy. Therefore, in this study, an apparatus has been designed and built for conduction creep tests under constant load conditions. A series of creep tests on Inconel 690 alloy have been performed to get the basic design data and life prediction of inconel products and we have gotten the following results. First, the stress exponents decrease as the test temperatures increase. Secondly, the creep activation energy gradually decreases as the stresses becomes bigger. Thirdly, the constant of Larson-Moller parameters on this alloy is estimated about 10. And last, the fractographs at the creep rupture show both the ductile and the brittle fracture according to the creep conditions.
실험적 모드해석을 위한 장치구성 및 LabVIEW 프로그래밍
황진하,박종회,정진덕 충북대학교 건설기술연구소 2004 建設技術論文集 Vol.23 No.1
The purpose of this paper is to construct the vibration test equipments for experimental modal analysis which is more economical than commercial measurement equipments and to develop the analysis program which can be used to extract the dynamic characteristics of structures such as natural frequencies and mode shapes. To verify and validate the suggested hardwares and softwares for economical and accurate vibration test, a cantilever beam test was carried out and the results were compared with the numerical results which was calculated from FE analysis and theoretical values.
현장 재하시험을 통한 국내고용 교량에 대한 동적효과 분석
황진하,박종희,박광림 충북대학교 건설기술연구소 2002 建設技術論文集 Vol.21 No.2
A statistical analysis for estimation the dynamic characteristics of bridge structures is presented in this paper. The dynamic responses of the real bridges due to test vehicles and normal traffic loads are measured for 147 bridges with different types and span lengths etc. Using the measured data in field, correlation and regression analysis of vibration-related parameters are performed on SPSS, and the results are compared with Standard Specifications. From the results of this study, it considered that impact factors in Korean Specification seems to have low values, as the span length increases regardless of the structural types, and to give high load carrying factors.
황병호,이현종,강하영,유순희,조재현,조국란 江原大學校 森林科學硏究所 1997 Journal of Forest Science Vol.13 No.-
요 약 주요 소나무류잎의 특수성분을 분석하여 시판되고 있는 솔잎 가공식품의 기초데이터를 제공함과 동시에 임산화학 분야의 학문적 기초데이터를 축적하기 위하여 실시한 결과, 펙틴은 잣나무가 가장 높게 분석되었으며, 탄닌은 잣나무가 높게 분석되었고, 소나무와 해송은 유사하였다. 테르페노이드 성분중 α-pinene은 소나무와 잣나무에서, β-pinene은 리기다와 해송에서 높게 분석되었으며, 희귀성분으로는 잣나무에서 sabinene과 citronellol, 리기다에서는 α-pinene oxide 등이 분석되었다. 특히 소나무일체 다량 존재하는 성분은 α-pinene, β-caryophyllene, β-phellandrene, Δ3-carene, phytol 등 이었다. 향기성분의 주체인 α-pinene, limonene, bornylacetate들이 소나무와 잣나무에서 보다 많이 분석된 것으로 보아 삼림욕의 상쾌한 내용의 주체성분이라고 생각된다. ABSTRACT Pectin and tannin analysis were carried out to inverstigate any available components from Pinus densiflora, koraiensis, P. thunbergii and P. rigida. To analyze terpenoid components, the essential oils were extracted with steam distillation method from four kinds of pine needles. The essential oil was analyzed by GC and GC-MS spectroscopy.The results were summarized as follows: Pectin content was highest in P. koraiensis with 0.40%, and tannin content was highest in P koraiensis with 1.05. Major components of P. densiflora needles were α-pinene, β-caryophyllene, Δ3-carene and phytol. α-Pinene, Δ3-carene, β-caryophyllene, germacrene D, and camphene were found major components n P. koraiensis. Major components of P. thunbergii needles were β-pinene, α-pinene, β-caryophyllene and germacrene D. β-Pinene, α-pinene, humulene oxide and α-elemene were major components in P. rigida. Sabinene and citronellol were infrequent components in P. Koraiensis, and α-pinene oxide was present only in P. rigida. α-Pinene, limonene, and bornylacetate well known as the mail components of green air bath were found in P. densiflora and P. koraiensis.
황진하,박종회,정진덕 충북대학교 건설기술연구소 2002 建設技術論文集 Vol.21 No.1
A new method that performs multilevel design optimization for structural design is presented in this paper. This study demonstrates hybrid optimization method which combines a general mathematical programming algorithm with classical fully stressed design method. Systems optimization is achieved with system level constraints by the former, while the latter is exercised with local constraints in subsystem level. Numerical results for widely used truss models show the validity and efficiency of this study.