http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
C-MEMS 기반 디바이스의 패키징을 위한 탄소 박막이 집적된 Through Silicon Via 기술 개발
곽종현(Jong-Hyun Kwak),김범상(Beomsang Kim),김신관(Shin-Kwan Kim),김건호(Gun-Ho Kim),신흥주(Heungjoo Shin) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Through silicon via (TSV) is an important component in microelectromechanical systems (MEMS) packaging used for electrical connections through a silicon chip. A widely used approach in TSV fabrication is to fill the TSV holes with metals or electrically conductive adhesives. However, they are not compatible with MEMS devices that require high temperature (e.g. C-MEMS technology including high temperature pyrolysis processes) or harsh chemical processes. In this paper, we introduce a novel method of TSV technology compatible with C-MEMS process. By sealing the top side of TSV holes with an electrically conductive thin carbon film derived by the pyrolysis of photoresist, good electrical connection through TSVs (~ 10 Ω) was secured even after C-MEMS-based humidity integration via high temperature process (~ 700 ℃).
주행차량(走行車輛)에 의한 도로교(道路橋)의 진동특성(振動特性)에 관한 실험적(實驗的) 연구(?究)
장동일,곽종현,이희현,Chang, Dong Il,Kwak, Jong Hyun,Lee, Hee Hyun 대한토목학회 1988 대한토목학회논문집 Vol.8 No.2
본(本) 논문(論文)에서는, 국내(國內)에 가설(架設)되어 있는 30개(個) 교량(橋梁)들에 대한 정동적시험(靜動的試驗)으로부터 얻어진 동적특성(動的特性)에 관한 기본자료(基本資料)를 정리(整理)하여, 교량진동(橋梁振動)의 주(主)된 원인이 되는 사항에 대해 살펴보았다. 시험(試驗)은 교량(橋梁)의 중앙하부(中央下部)에 변위측정기(變位測定機)와 변형(變形)게이지를 설치(設置)한 뒤 단일만재차량(單一滿載車輛)을 주행(走行)시켜 실시(實施)하였으며, 이때 얻어지는 동적(動的)데이타는 강제진동(强制振動)과 자유진동(自由振動)으로 구분(區分)하여 시간영역해석(時間領域解析)을 통하여 분석(分析), 교량(橋梁)의 진동특성(振動特性)을 연구(硏究)하였다. 여기서 얻어진 자료(資料)는 국내(國內)에서 초보적 단계에 있는 도로교(道路橋)의 진동거동예측(振動擧動豫測)에 귀중한 자료(資料)를 제시할 것이다. In this paper, main effects of bridge vibration were investigated by arranging static and dynamic test data on 30 highway bridges. The test were conducted using displacement transducers and strain gages attached at midspan of each bridges over which a heavy test vehicle was running. Then, vibrational characteristics of the bridges were obtained in the time domain analysis by distinguishing the forced and free vibration state. The results obtained in this paper will be used properly to simulate the vibrational behaviour of the bridges which is in the state of the beginning in the domestic.
장동일,곽종현,박용걸,Chang, Dong Il,Kwak, Jong Hyun,Bak, Yong Gol 대한토목학회 1988 대한토목학회논문집 Vol.8 No.2
본 연구의 목적은 변동하중을 받는 구조부재의 피로거동을 해석하는 것이다. 이 연구의 해석과정은 다음과 같다. (1) 도로교의 실동응력파측정 및 통계적해석 (2) 등가의 일정진폭하중과, 통계적해석에 의해 모형화된 변동하중하(下)의 피로시험 (3) 등가응력개념의 RMC 모델에 의한 변동하중하(下)의 피로해석 등가응력개념에 의한 변동하중하(下)의 피로해석은 대부분의 구조용강재의 균열성장속도회귀지수가 $m{\fallingdotseq}3$이므로 이론적으로 RMC 모델이 합당하다. 변동하중하(下)의 피로시험해석결과 RMC 모델이 기존의 RMC 모델보다 변동하중에 의한 피로거동치(da/dN-${\Delta}K$, $N_f$)에 더 가까웠다. 또 변동하중하(下)에서 응력범위의 변화로 인한 interaction효과나 응력범위적용순서(sequence)효과 등은 피로수명에 거의 영향을 미치지 않으며, 응력범위변화속도가 클수록 피로균열성장속도가 빨라짐을 알 수 있었다. The principle objective of this study is to evaluate the fatigue behavior of structural steel components of highway bridges subjected to service stresses. The main aspects of this investigation are; 1) a measurement and statistical analysis of service stress cycles observed in highway bridge. 2) fatigue tests under equivalent constant-amplitude(CA) loading and simulated variable-amplitude(VA) loading 3) a evaluation of the fatigue behavior under VA-loading by eqivalent root mean cube (RMC) stress range. Theoretically, the RMC model is adequate in evaluation of fatigue behavior under VA-loading, because the regression coefficient (m) of crack growth rate is 3 approximately. The result of fatigue test shows that the RMC model is fitter than the current RMS model in fatigue evaluation under VA-loading. The interaction effects and sequence effects under VA-loading affect little fatigue life of structural components. As the transition rate of stress ranges is higher, the crack growth rate is higher.
팔라듐 전극 집적으로 국부적 pH 조정이 가능한 무효소 혈당 센서 개발
정우재(Woojae Jeong),김범상(Beomsang Kim),곽종현(Jong-Hyun Kwak),신흥주(Heungjoo Shin) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Non-enzymatic glucose sensors are attracting attention due to their thermal/chemical stability and cost-effective manufacturing. The common detection mechanism of non-enzymatic glucose sensors is based on the interaction of glucose with reactive hydrous oxide layer on metal electrode. Therefore, sufficient hydroxide ions and a large electrode surface area are advantageous for sensitive glucose detection. In this study, we present a non-enzymatic glucose sensor based on nanoporous carbon electrode with gold nanoparticle incorporated with a palladium microelectrode enabling local pH modulation; this allows for sensitive glucose detection (10-200 M) without the need for pretreatment and complex sample control device. In addition, the nanoporous carbon electrode with metal nanoparticles was fabricated at a wafer level using conventional microfabrication technologies including carbon-MEMS ensuring cost-effectiveness. The glucose sensor performance was tested by comparing glucose detection with and without pH modulation using the integrated palladium microelectrode.
곽종현,이종각,이종석,김종배 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.0201
본 연구는 총유사량의 산정에 기초가 되는 평균 유사 농도식 (1)또는 (2)를 유사이송개념에 의한 방법중 다중회귀분석에 의해 유도하고 그 결과를 실측치와 비교하였다. 평균유사농도식의 유도에는 175개의 현장자료와 305개의 실험자료가 포함된 480개의 실측자료가 이용되었으며, 다중회귀분석에 의한 관계식은 수심과 평균유속, 수로경사, Froude 수 및 하상재료의 중앙입경을 변수로 하는 5개의 독립변수로 하여 유도하였다. 유도된 관계식은 수심이 0.030~5.288m이고, 평균유속은 0.021~2.880m/sec이며, 수로경사는 0.000081~0.024348, 하상재료의 중앙입경은 0.084~28.650 mm, Froude수는 0.061~2.060 및 평균유사농도는 9.1~49,300 ppm의 범위 내에서 총유사량의 산정에는 물론 미계측 하천에서 총유사량의 개략치를 산정하여 유사이송의 문제를 해석하는 데에도 적용이 가능할 것으로 사료된다. The derived formulation (1) or (2) in this study was developed in order to compute the total sediment discharge from the one by the multiple regression analysis one of the determined method for averaged sediment concentration in the sediment transport concept, and the result compared with measured data. The used data set in derived formulation consist of the total 480 data including 175 and 305 measured data in natural channels and experimental channels, respectively. Also, the formulation was derived by the multiple regression analysis, and were composed of 5 independent variables of flow depth, mean velocity, channel slope, Froude number, averaged sediment concentration and median diameter in bed materials. Those variable values were ranged 0.030~5.288m in flow depth, 0.021~2.880m/sec in averaged velocity, 0.000081~0.024348 in channel slope, 0.084~28.650mm in particle median diameter, 0.061~2.060 in Froude number and 9.1~49,300ppm in averaged sediment concentration, respectively. And the derived formulation for the averaged sedliment concentration can be used analysis of sediment transport problems as well as approximation of total sediment discharge in natural alluvial rivers.
骨材의 粒度가 MORTAR 및 CONCRETE의 强度에 미치는 影響
郭鍾現 大田工業高等專門學校 1970 論文集 Vol.6 No.-
It is widely known that the grading of aggregate has a great influence on the strength of mortar and concrete. At present the various works of mortar and concrete, however, are being executed with emphasis chiefly on the proportion but slightly on the grading, of aggregate. This not only makes the construction flimsy dut brings forth a great loss of property and lives. In order to try and solve this problem an experiment has been made of the influence of the grading on the compression stress of mortar and concrete, whose results are summerized as follows: a) In the proportion of the same grading, both mortar and concrete have their strength dominated by the amount of the cememt used. b) In any proportion mortar and concrete have their strength lowered positively, if the water-cement ratio is not proper. c) Mortar has greater strength when the mixed ratio of the aggregate of higher grading is bigger than that of lower grading. d) In concrete, its strength is strong and commonly fit when one or two grading of sort is used intensively, but when the grading is mixed in permutaion it is reversed.