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김준호,노용래,Kim, Jun-Ho,Roh, Yong-Rae 한국음향학회 2010 韓國音響學會誌 Vol.29 No.8
본 논문에서는 판 형상의 구조물에 발생한 균열의 형상과 개수 등을 진단할 수 있는 Inter-Digital Transducer (IDT)형 Lamb 파 센서를 제안하고 그 타당성을 실험적으로 검증하였다. IDT형 Lamb 파 센서는 기존의 패치형 압전 센서보다 작동 주파수의 조절이 용이하고, finger의 형상에 의해 지향성을 조절할 수 있다는 등의 장점이 있다. 본 논문에서는 무지향성을 가지는 환상형 IDT형 센서와 높은 지향성을 가지는 사각형 IDT형 센서를 설계, 제작하고, 이들에 의해 알루미늄 판을 전파하는 Lamb 파의 전파시간과 진폭의 변화를 측정, 분석하여 판 내에 발생한 균열의 길이, 개수 및 각도를 평가하고, 제안한 IDT 센서의 효용성을 고찰하였다. In this paper, an Inter-Digital Transducer (IDT) type Lamb wave sensor is proposed to estimate the geometry and number of cracks on a plate structure, and its validity is checked through experiments. This IDT type sensor is more readily controllable than conventional patch type piezoelectric sensors to modify its operation frequency and directionality by altering its finger patterns. In this work, omni-directional annular IDT and highly directional rectangular IDT sensors are designed and fabricated. The IDT sensors are used to diagnose the length, number and orientation of cracks on an aluminum plate by measuring the amplitude and time of flight of Lamb waves. The results are analyzed to discuss the efficacy of the IDT sensors.
구강작열감증후군과 구강 내 Helicobacter pylori의 상호관련성
김준호,유지원,윤창륙,안종모,Kim, Jun-Ho,Ryu, Ji-Won,Yoon, Chang-Lyuk,Ahn, Jong-Mo 대한안면통증구강내과학회 2011 Journal of Oral Medicine and Pain Vol.36 No.2
Helicobacter pylori (H. pylori) is bacterial infection, with more than half of the world population infected and relates to many oral disease such oral lichen planus, recurrent aphthous ulceration, periodontal disease and halitosis and so on. Burning mouth syndrome(BMS) is defined as a burning sensation of the oral mucosa, lips, and/or tongue, in the absence of specific oral lesions. The etiology of BMS is suggested local, systemic and psychological factors and researchs related BMS and to infection of H. pyloir in the oral cavity are few. The purpose of this study was to evaluate relationship between burning mouth syndrome and H. pylori in the oral cavity. We recruited 21 subjects with burning mouth syndrome and 21 subjects as control group. Samples in the oral cavity were taken area of buccal mucosa, dorsum of the tongue and saliva. We analysed samples by nested polymerase chain reaction(PCR). The results were as follows: 1. Among 21 patients with burning mouth sydrome and 21 subjects of control group, 6(29%) and 3(14%) were positive respectively(P>0.05). 2. In detection rate of H. pylori in area taken sample, 3(14%), 2(10%) and 4(19%) were positive in buccal mucosa, dorsum of the tongue and saliva of patient and 2(10%) and 1(5%) were positive in dorsum of the tongue and saliva of control group(P>0.05). Conclusively, we can guess that H. pylori in the oral cavity is not related with burning mouth syndrome.
단상 스위치드 릴럭턴스 모터에 설치된 영구자석 기동장치의 디텐트 토크
김준호,이승민,Kim, Jun-Ho,Lee, Seung-Min 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.5
The single-phase switched reluctance motor(SRM) generates the positive torque in the restricted section. So, it can not started by itself and the torque ripple is heavier than poly-phase. For self-starting and fixing rotating direction, the rotor should be placed at the rising inductance slope when stationary. The parking permanent magnet locates the rotor in the fixed position, which can be started by it-self. It is very simple and cost effective but has some drawbacks. It affects the rotor during the operation, so the characteristics of motor, such as a torque, speed, and ripple are changed to go bad. This paper presents the detent torque of parking magnet starting device through the finite element analysis and experiments. The finite element analysis is performed at incremental rotor positions over one detent torque cycle for any one pole. The prototype, fabricated in the previous research, is used for the experiments. The inductance, instant torque, and detent torque are calculated using the terminal voltage and phase current. Finally, the finite element analysis result and the experiment result are compared for analysis and validity.
우레탄기를 포함하는 벤조퀴논 / 디아민 중합체의 합성과 특성분석
김준호,노시태,김동국,이치규 ( Jun Ho Kim,Si Tae Noh,Dong Kook Kim,Chi Gyu Lee ) 한국공업화학회 1993 공업화학 Vol.4 No.4
용해성과 접착력을 향상하기 위하여 우레탄 그룹을 함유하는 디아민-퀴논 중합체를 합성하고 특성분석을 행하였다. 디이소시아네이트와 저분자량의 디올을 반응시켜 NCO말단 프리폴리머를 합성한 다음 NCO그룹을 아민으로 변화시켜 우레탄기를 함유하는 디아민을 제조하였다. 이때 NC0/0H몰 비율을 1.2에서 2.1까지 변화시켜 디아민 분자량을 변화시켰다. 이러한 디아민기를 함유하는 프리폴리머를 p-벤조퀴논과 반응시켜 디아민-벤조퀴논 중합체를 제조하였다. 중합체의 분석에는 분광분석기와 크로마토그래피를 이용하여 분자구조 분석과 분자량을 측정하였으며, 용해도와 열적 거동도 측정·검토하였다. To improve the solubility and adhesion strength of diamine-quinone polymers, urethane group was introduced into the polymer backbone. Urethane group containing polymeric diamines(UDA) were prepared firstly by the decarboxylation of the NCO group in NCO terminated prepolymer obtained from the reaction of MDI and 1.6-hexandiol. The reaction mole ratio of NC0/0H was changed from 1.2 to 2.1 to increase the molecular weight of diamine. From the addition reaction of UDA and p-benzoquinone in THF or DMSO solvent, five kinds of urethane group containing diamine/quinone polymers(PUAQ) were prepared according to the diamine used. IR, NMR, UV-visible spectroscopy and GPC were used to characterize the molecular structure and molecular weight of UDAs and PUAQs. Thermal analysis of polymer by DSC and TGA were carried out according to the molecular weight differency. Also solubility test of UDA and PUAQ with 10 different solvents were carried out to predict the coating property of the polymers.
고로슬래그 미분말과 알칼리 자극재로서 순환골재를 사용하는 콘크리트의 강도발현 특성
김준호,한민철,한천구,Kim, Jun-Ho,Han, Min-Cheol,Han, Cheon-Goo 한국건설순환자원학회 2014 한국건설순환자원학회 논문집 Vol.2 No.2
본 연구에서는 자원순환형으로 재활용되는 순환골재(RA)를 고로슬래그 미분말(BS) 콘크크리트에 치환하여 강도발현특성을 확인하므로 RA의 실용화에 기여하고자하는 연구이다. 즉, BS치환 콘크리트에 RA를 순환잔골재(RFA) 순환굵은골재(RCA)로 나누어 천연잔골재(NFA) 천연굵은골재(NCA)에 치환율을 실험변수로 하여 실시하였다. 실험결과 RFA RCA의 치환율이 증가함에 따라 강도가 증가하는 것을 확인하였는데, 이는 RA의 미수화 시멘트에 의한 알칼리자극재(Alkali Activation) 역할을 하여 BS의 불투수성 피막을 파괴하여 잠재수경성 반응을 촉진시킨 것으로 판단된다. 그러나, 재령 365일에서는 RA의 알칼리가 거의 소비되어 효과를 발휘하지 못하고, 또한 RA의 낮은 품질특성에 기인하여 강도가 다소 저하하나, 천연골재(NA)만을 사용한 시험체에 비해 약 90 % 전후의 강도를 나타내어 다소 양호한 값이며, BS의 치환할 경우 오히려 NA 시험체보다 높은 강도를 나타내어 우려할 사항은 아닌 것으로 분석되었다. The objective of this study is to evaluate the strength development of blast furnace slag concrete in response to the use of recycled aggregate as alkali activator. The influence of the amount of recycled aggregate was evaluated depending on different ratios of replacement for each RFA and RCA to NFA and NCA, respectively. The results indicated that as replacement of RFA and RCA increased, their strength exhibited to be increased. This was due to the fact that the latent hydraulic properties of blast furnace slag was activated by the alkali in recycled aggregates. However, in case of 365-days, it showed lower compressive strength than using NA(natural aggregates) which could be explained as the exhaustively use of alkali containing in RA. The specimens using RA showed about 90% of compressive strength comparing with specimens using NA.