Mo/SiO₂/Si(100)기판 위에 MOCVD법으로 성장시킨 AIN박막이용 GHz대역의 FBAR제작에 관한 연구

양충모,김성권,차재상,박구만,Yang, Chung-Mo,Kim, Seong-Kweon,Cha, Jae-Sang,Park, Ku-Man 한국조명전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.4

본 논문에서는 $Mo/SiO_2/Si(100)$ 기판 위에 MOCVD(Metal-Organic-Chemical-Vapor Deposition)법을 이용하여 C축 방향으로 성장시킨 AIN(Aluminum Nitride) 박막을 이용하여 GHz대역 무선 통신에서 사용할 수 있는 FBAR(Film-Bulk-Acoustic Resonator)을 제작하였다. 제작된 공진부의 공진주파수와 반공진주파수는 각각 3.189[GHz]와 3.224[GHz]으로 측정되었으며, Q값(Quality Factor)과 유효한 전기기계 결합계수(${k_{eff}}^2$)는 각각 24.7과 2.65[%]로 평가되었다. AIN의 증착(Deposition) 조건은 $950[^{\circ}C]$의 기판표면(Substrate) 온도, 20Torr의 압력, 25000의 N/Al의 V/III비로 증착하였다. $4{\times}10^{-5}[\Omega{cm}]$의 Mo 하부전극 고유저항과 $Mo/SiO_2/Si(100)$ 기판 위에 AIN(0002) FWHM(Full-Width at Half-Maximum) 4를 갖는 C축 방향성의 AIN 박막을 성공적으로 성장시켰다. 따라서 증착된 AIN박막의 FWHM값은 GHz대역 무선 통신용 RF(Radio Frequency) 밴드 패스 필터 설계에 유용하게 사용될 것이다. In this paper, it is reported that film-bulk-acoustic resonator with high c-axis oriented AIN film on $Mo/SiO_2/Si(100)$ using metal-organic-chemical-vapor deposition was fabricated. The resonant frequency and anti-resonant frequency of the fabricated resonator were observed with 3.189[GHz] and 3.224[GHz], respectively. The quality factor and the effective electromechanical coupling coefficient(${k_{eff}}^2$) were measured with 24.7 and 2.65[%], respectively. The conditions of AIN deposition were substrate temperature of $950[^{\circ}C]$, pressure of 20Torr, and V-III ratio of 25000. A high c-axis oriented AIN film with $4{\times}10^{-5}[\Omega{cm}]$ resistivity of Mo bottom electrode and $4[^{\circ}]$ of AIN(0002) full-width at half-maximum(FWHM) on $Mo/SiO_2/Si(100)$ was grown successfully. The FWHM value of deposited AIN film is useful for the RF band pass filter specification for GHz-band wireless local area network.

同軸形 色素레이저의 製作 및 出力 特性

朴成培,鄭謨基 대구대학교 기초과학연구소 1987 基礎科學硏究 Vol.4 No.-

A coaxial flashlamp-pumped dye laser is developed and its output characteristics is investigated. The laser is pumped by an argon flashlamp which is placed along the same axes with dye cell. Rhodamine 6G dye in ethanol is used as Iasant and the dye solution is circulated by gravity. The Iaser pulse duration is measured to be 0.5 μsec (FWHM) when the duration of pumping Iight pulse is 7 μsec (FWHM) with dye concentration of 5 × 10^(-4)mo1/L. The peak output power of laser is saturated when the pressure of argon flashlamp is 450 torr.

A Study on Factors Related to Residential Satisfaction in Different Income Brackets

Park,Nae-Sik,Chung,Cheol-Mo 한국주거환경학회 2018 주거환경(한국주거환경학회논문집) Vol.16 No.3

Ⅰ. Introduction Ⅱ. Theoretical Study Ⅲ. Frame of analysis Ⅳ. Analysis of the factors affecting residential satisfaction according to the income bracket Ⅴ. Conclusion 본 연구는 소득계층에 따라 주거만족도에 영향을 미치는 요인이 무엇인지를 파악하기 위하여 「2016년 주거 실태조사」를 활용하여 회귀분석으로 주거만족도 영향 요인을 분석하였다. 분석결과 첫째, 주거만족도에 물리적 요인과 입지적요인, 사회․환경적요인은 양(+)의 영향을 미치는 것으로 나타났다. 둘째, 주거만족도에 주택면적이 양(+)의 영향을 미치는 것으로 나타났다. 이는 주택면적이 클수록 주거만족도가 높게 나타났다. 셋째, 주거만족 도에 주택유형더미가 영향을 미치는 것으로 나타났다. 전체가구에서는 양(+)의 영향을 미치는 것으로 나타났으 나, 저소득층과 고소득층에서는 음(-)의 영향을 주는 것으로 나타났다. 넷째, 주거만족도에 지역더미가 양(+)의 영향을 미치는 것으로 나타났다. 이는 수도권에 거주하는 가구가 주거만족도가 높게 나타나는 것으로 나타났다.

A Study on Current Use of Land in Green Areas and Improvement -Focused on Jeon-ju City-

Park,Ho Soo,Chung,Cheol Mo 한국주거환경학회 2018 주거환경(한국주거환경학회논문집) Vol.16 No.4

1. Introduction 2. Exploration of Theories and Earlier Studies 3. Case Analysis of Green Areas in Jeonju 4. Conclusion 본 연구는 도시계획구역 내 녹지지역의 무질서한 난개발과 경관 및 생태환경의 훼손을 방지하고 지역맞춤형 친환경적인 토지이용질서를 모색하기 위한 목적으로 전주시 녹지지역이 갖고 있는 실태를 파악하고 장기적인 개선방안을 도출하고자 하였다. 연구방법은 녹지지역내 거주하고 계신 주역주민 뿐만 아니라 직접 농지를 경작하고 계신 주민, 공장용지를 소유한 토지주 및 임대하여 사용중인 사업주 그리고 부동산 분야 개발전문가 등 4개의 그룹으로 대상을 구분하여 설문을 실시하였다. 이를 통해 전주시 녹지지역의 친환경적인 보전관리와 지역수요 맞춤형 녹지지역의 미래지향적 활용방안을 종합적으로 제안하고자 하였다. 분석결과 녹지지역의 통합적 관리와 보전 그리고 지역주민의 차별적인 개발수요에 대응하기 위해서는 지역맞춤형 지구단위 계획제도의 활성화 그리고 현재 난개발을 촉진하는 개발행위허가제와 관련제도에 대한 통합적인 정비 및 녹지 지역의 사회간접시설에 대한 확충이 단계적으로 추진되어야 하는 것으로 나타났다.

人蔘이 自然發生高血壓쥐에 있어서 血壓 및 血漿 Renin 活性度에 미치는 影響에 關한 實驗的 硏究

孫宜錫,朴陞哲,許鳳烈,李禎均,林憲吉,咸駿洙,梁忠模,韓哲洙,朴贊雄,金海中 대한의학협회 1979 대한의학협회지 Vol.22 No.9

검도 머리치기 유형에 따른 상지의 근전도 비교 분석

장언량,박영훈,염창홍,서국웅,이경순,강영택,양충모 釜山大學校 附設 體育科學硏究所 2004 體育科學硏究所 論文集 Vol.20 No.-

Of the fencing club members at D university in B city, the four skilled members and the 4 unskilled members were selected. The MVC of the left brachioradialis, right brachioradialis and left flexor carpi radialis, right flexor carpi radialis each was measured in each group according to the striking directions as they act 'striking left right head'......

발레 숙련도에 따른 센터에서 Grand Battement Jete´ a´ la seconde 동작의 운동학적 비교 분석

염창홍,박영훈,서국웅,양충모 한국운동역학회 2004 한국운동역학회지 Vol.14 No.2

C. H. YOUM, Y. H. PARK, K. W. SEO, C. M. YANG. Comparison of the kinematic analysis of grand battement jete ?la second in center between skilled and unskilled ballet majors. Korean Journal of Sport Biomechanics, Vol. 14, No. 2, pp. 153466, 2004. The purpose of this study was to investigate time of the phase, angle of the right ankle, knee, and hip joint, lateral angle of the trunk, mediolateral displacement of COM, and vertical displacement of COM between two groups while executing grand battement jets ?la seconde in a center exercise setting through 3D video analysis. The subjects participated in this study were skilled and unskilled 6 female ballet majors in Busan, respectively. The conclusions are as follows: 1. The time of the phase 2 was faster than P3. It shows a significant difference(p<.05) for P1 and P4 between skilled and unskilled groups. 2. The angle of the right ankle joint has a significant difference(p<.05) at E4 between skilled and unskilled groups. The angle of the right knee joint has no significant difference at all events between skilled and unskilled groups. The angle of the right hip joint has a significant difference(p<.001) at E3 between skilled and unskilled groups. 3. The lateral angle of the trunk has a significant difference(p<.05) at El and at E5 between skilled and unskilled groups. The skilled group of the lateral angle of the trunk was lower than the unskilled group. However the skilled group's lateral angle of the trunk was bigger than the unskilled group at E3. It has significant difference(p<.001) at E3 between skilled and unskilled groups. 4. The mediolateral displacement of COM has no significant difference at all events between skilled and unskilled groups. The vertical displacement of COM has a significant difference(p<.01) at E3 between skilled and unskilled groups.

진동시험에 의한 참외의 진동특성

김만수,정현모,김기석,박정길 충남대학교 농업과학연구소 2005 농업과학연구 Vol.32 No.1

During a long journey of agricultural products from the production area to markets, the quality of agricultural products was always affected by some degree of vibration. The vibration input during the transportation may cause serious agricultural product injury, and this damage is particularly severe whenever the vegetable inside package is free to bounce, and is vibrated at its resonant frequency. The objectives of this study were to determine the resonant frequency of the oriental melon and to investigate the relationships between resonant frequency and physical properties of the oriental melon such as mass, volume and major and minor axes. In this study vibration testing device was constructed to determine the vibration response of the oriental melon in frequency ranges of 5 to 150 Hz. The computer program for controlling the vibration shaker and the function generator and measuring the vibration characteristics of the oriental melon was developed. The ranges of resonant frequency and peak acceleration at resonance of the oriental melon were 51 to 73 Hz and 1.24 to 1.92 G-rms, respectively. The resonant frequency and the peak acceleration decreased with the increase of the sample mass, volume, major and minor axes of the oriental melon. Multiple regression models for resonant frequency and peak acceleration of the oriental melon as a function of mass, major axis and minor axis of the sample were developed and analyzed.

DJ-1 deficiency impairs synaptic vesicle endocytosis and reavailability at nerve terminals

Kyung, Jae Won,Kim, Jin-Mo,Lee, Wongyoung,Ha, Tae-Young,Cha, Seon-Heui,Chung, Kyung-Hwun,Choi, Dong-Joo,Jou, Ilo,Song, Woo Keun,Joe, Eun-Hye,Kim, Sung Hyun,Park, Sang Myun National Academy of Sciences 2018 Proceedings of the National Academy of Sciences Vol.115 No.7

<P>Mutations in DJ-1 (PARK7) are a known cause of early-onset autosomal recessive Parkinson's disease (PD). Accumulating evidence indicates that abnormalities of synaptic vesicle trafficking underlie the pathophysiological mechanism of PD. In the present study, we explored whether DJ-1 is involved in CNS synaptic function. DJ-1 deficiency impaired synaptic vesicle endocytosis and reavailability without inducing structural alterations in synapses. Familial mutants of DJ-1 (M26I, E64D, and L166P) were unable to rescue defective endocytosis of synaptic vesicles, whereas WT DJ-1 expression completely restored endocytic function in DJ-1 KO neurons. The defective synaptic endocytosis shown in DJ-1 KO neurons may be attributable to alterations in membrane cholesterol level. Thus, DJ-1 appears essential for synaptic vesicle endocytosis and reavailability, and impairment of this function by familial mutants of DJ-1 may be related to the pathogenesis of PD.</P>

洛東江 河口海城의 식물플랑크톤 極大城 變動에 관한 數値시뮬레이션 : Ⅱ. 식물플랑크톤 극대역 변동의 수치시뮬레이션 Ⅱ. The numerical simulation on variation of phytoplankton maximum region

이대인,김동명,김형철,이석모,박청길 한국환경과학회 2000 한국환경과학회지 Vol.9 No.5

It is very important to interprete and simulate the variation of phytoplankton maximum region for the prediction and control of red tide. This study was composed of two parts, first, the hydrodynamic simulation such as residual current and salinity diffusion, and second, the ecological simulation such as phytoplankton distribution according to freshwater discharge and pollutant loads. Without the Nakdong river discharge, residual current was stagnated in inner side of this estuary, and surface distribution of salinity was over 25psu. On the contrary, with summer mean discharge, freshwater stretched very far outward and some waters flowed into Chinhae Bay through the Kadok channel, and low salinity extended over coastal sea and salinity front occurred. From the result of contributed physical process to phytoplankton biomass, the accumulation was occurred at the west part of this estuary and the Kadok channel with the Nakdong river discharge. When more increased input discharge, the accumulation band was transported to outer side of this estuary. The frequently outbreak of red tide in this area is caused by accumulation of physical processes. The phytoplankton maximum region located inner side of this estuary without the Nakdong river discharge and with mean discharge of winter, but it was moved to outer side when mean discharge of the Nakdong river was increased. The variation of input concentration from the land loads was not largely influenced on phytoplankton biomass and location of maximum region. When discharge was increased, phytoplankton maximum region was transferred to inner side of the Kadok channel. On the other hand, when discharge was decreased, phytoplankton maximum region was transferred to inner side of this estuary and chlorophyll a contents increased to over 20㎍/L. Therefore, if any other conditions are favorable for growth of phytoplankton, decrease of discharge causes to increase of possibility of red tide outbreak.