http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
정성수 창원대학교 일반대학원 2010 국내박사
Abstract A Study on Optimal Design and Driving Characteristics of Thin-type Ultrasonic Motor by Seong Su Jeong Dept. of Electrical Engineering Graduate School, Changwon, National University Changwon, Korea Directed by prof. Tae Gone Park Ph.D. In this study, novel structured thin-type ultrasonic motor has been proposed. It is possible to fabricate thin type ultrasonic motor by using simple punching skill. A thin metal plate was used as a cross shaped vibrator and sixteen ceramic plates were attached on upper and bottom side of the metal plate. From the thin stator, elliptical displacements of the four contact tips were obtained. When two harmonic voltages which have 90o phase difference were applied to the ceramics, the symmetric and anti-symmetric displacements were generated at inside of the tips to make the elliptical motion. A finite element analysis (ATILA) was used for simulating the motional pattern of contact tips of the stator. FEM enabled both ceramic length and parameters of width affecting longitudinal vibration to be analyzed. Afterward, reciprocal action of length, width was examined after FEM analysis about thickness of ceramics. In addition, stator characteristic about change of material and scale was analyzed. Optimal designed thin type ultrasonic motor was fabricated by using FEM analysis. Speed, torque, and current were measured by applying sinusoidal waves through driving equipment such as function generator, power amplifier: to measure characteristic of the motor. Two-drivers which generate sinusoidal waves and square waves were designed respectively, and then were compared through some experiments in order to be put to practical use. Below ones are operation characteristic of motor and result of optimal designed thin type ultrasonic motor. 1) As a result of FEM analysis, it is able to find out four resonances mode equally regardless of all sorts of models. Mode 1 had significant displacement among four resonance modes. Frequency was proportional to length of ceramic and inversely proportional to thickness. 2) As a result of FEM analysis about change of ceramic length and width, model 'W3T1L24' had the highest elliptical displacement. This consequence represented that is same to longitudinal vibration(transverse mode of ceramic). However, if the proportion of length to width is higher than the ratio of one to eight, it might cause buckling. 3) As a result of FEM analysis about change of ceramic thickness, model W3T1L24 and W3T1.5L27 had significant displacement. Maximum displacement represented reciprocal action which length was lengthened according to ceramic thickness. Speed and torque characteristic of W3T1L24, optimal motor model, was proportional to voltage. It showed 65[rpm] speed and 25[gfcm] torque at 30[Vrms]. 4) As a result of FEM analysis about material change of elastic body, magnitude of elliptical displacement was steel, brass, aluminum and copper in order. This was same to speed characteristic about motor fabrication. Torque characteristic was steel, copper, brass and aluminum in order. Besides, material which had high Young's modulus generated high speed and torque. 5) As a result of FEM analysis about scale change of stator, elliptic displacement wasn't proportional to scale. In addition, There is not much in it at speed and torque experiment. 6) Characteristic of optimal model ‘W3T1L24' was measured by using driving equipment. In conclusion, both maximum speed and minimum current was measured at 30[Vrms] voltage, 72.4[kHz] and 0.25[N] preload. 7) Two-drivers which generate sinusoidal waves and square waves were designed respectively, and then were compared through some experiments in order to be put to practical use. In conclusion, the drivers had similar characteristic of speed-torque at alike frequency and voltage. Characteristic was measured by utilizing newly devised driver generating sinusoidal waves and driver generating square waves. As a result, linear change of speed was measured at each range, 71.5~72.4[kHz] of driving equipment, 71.8~72.4[kHz] of sinusoidal waves driver and 71.9~72.4[kHz] of square waves driver, respectively. The linear parts of speed increased with frequency and the parts are necessary to put ultrasonic motor to practical use. In case of the sinusoidal wave driver, the current consumption was increased more than the driver using function generator and power amplifier because of losses of transformer and FET. On the other hand, the square wave driver made no difference with the driver using function generator and power amplifier. Therefore, it would be recommended to apply the square wave driver for practical use of the motor. Speed was in linearly inverse proportion to Torque. In comparison with driver generating sinusoidal wave, the characteristic of semi-conductor driver generating square wave was hardly different. Besides, it was also able to design more easily at low cost. So, it will be able to make driver unified as One-chip.
정성수 전주대학교 문화산업대학원 2018 국내석사
현재 미래의 가장 큰 이슈는 “경량화” 로서 산업 전반에 걸쳐 이에 대한 연구가 활발히 진행되어지고 있다. 이중 각종 현가장치에서 가장 중요한 요소로 사용되는 압축 코일스프링의 경우 대부분 금속재질을 사용하고 있으나 금속재질의 특성상 부식에 취약하며 치핑(Chipping)이 발생하는 등의 문제점을 가지고 있다. 따라서, 본 논문에서는 압축 코일스프링의 재질에 탄소복합재료CFRP(Carbon Fiber Reinforce Plastic)를 적용함으로서 기존 금속재질에 대한 문제를 해결 하고자 하였다. 또한 압축 코일스프링의 3D 모델링 및 ANSYS를 이용한 유한요소 해석을 통해 스프링상수 도출 및 이론값과의 비교를 통해 해석의 신뢰성을 확보하고 기존 금속 재질 코일스프링을 대체하기에 적합한지에 대해 확인하였다. 기존 금속 재질의 대표로 선정한 Structural Steel의 스프링상수 값은 해석 값과 이론값이 7.3N/mm 와 7.0N/mm로 확인되었고 이는 일방향 탄소섬유(0°)의 최대값인 1.09N/mm 와 1.25N/mm에 비해 현저히 높음으로 일방향 탄소섬유로 기존 금속재질의 스프링의 성능을 구현 해 내기에는 어려움이 있다는 것을 확인 하였다. 따라서 일방향 탄소섬유의 90도방향 하중에 대한 취약함을 대체하기 위하여 직조탄소섬유(0/90°)의 물성을 대입하여 추가적으로 해석을 진행하였고 여러 가지 설계인자들을 변경 해 가며 얻어낸 직조탄소섬유(0/90°)의 최대값은 6.47N/mm 와 7.21N/mm로 기존 금속재질인 Structural Steel의 상수 값에 대비하여 이론값 103%, 해석 결과 값 88.6%를 도출 해 내었다. 또한 해석 값과 이론값의 오차율을 계산하여 전체 데이터들의 정확성에 대한 검토를 진행 하였고 오차율은 평균 2.4%로 비교적 만족스러운 신뢰성을 확보할 수 있었다. 따라서 탄소섬유는 기존 금속재질의 단점을 극복하면서 탄소소재 자체의 장점을 유지할 수 있는 코일 스프링으로서의 적용 가능성을 확인하였으며 향 후 개발에 따라 상용화 가능성에 대한 충분한 근거를 수립하였다. Currently, the biggest issue in the future is "lightweight", and research is being actively conducted throughout the industry. In the case of compression coil springs used as the most important elements in various suspension devices, most of them use metal materials, but they are susceptible to corrosion due to the nature of the metal material and have a problem of chipping. Therefore, in this paper, we tried to solve the problem of existing metal materials by applying carbon composite material (CFRP) to the material of compression coil spring. In addition, the 3D modeling of the compression coil spring and the finite element analysis using ANSYS are used to obtain the spring constant and to compare with the theoretical value to confirm the reliability of the analysis and confirm whether it is suitable to replace the coil spring of the existing metal material. The spring constant value of the structural steel selected as representative of the existing metal material is the analytical value and the theoretical value It is confirmed that the strength of spring of conventional metallic material is uni-directional carbon fiber, which is 7.3N/mm and 7.0N/mm, which is significantly higher than 1.09N/mm and 1.25N/mm, which are maximum values of unidirectional carbon fiber(0°) We have found that it is difficult to implement. Therefore, in order to substitute the weakness of unidirectional carbon fiber with 90degree directional load, the property of woven carbon fiber(0/90°) The maximum values of the woven carbon fibers(0/90°) obtained by varying various design parameters were 6.47N/mm and 7.21N/mm in comparison with the constant values of the conventional metallic material, Structural Steel. Theoretical value 103%, and the analysis result value 88.6%. In addition, the error rate of the analytical value and theoretical value was calculated and the accuracy of the whole data was examined. The average error rate was 2.4%, which was relatively satisfactory. Therefore, it is considered that carbon fiber is a suitable substitute for coil spring that can overcome the disadvantages of existing metal materials and maintain the advantages of carbon material itself. It is thought that there is enough possibility to be developed and commercialized.
AMF기술을 적용한 SWRO 생산수의 잔류붕소제거 및 해수로부터의 붕소회수에 관한 연구
정성수 한국해양대학교 대학원 2013 국내석사
In this study, we have developed an efficient technique to remove boron from SWRO permeate water (1.51 mg B/L) and recover it from seawater (4.5 mg B/L) based on the adsorption membrane filtration (AMF) process. CRB05, a commercial boron selective resin (BSR) produced in Mitsubishi chemical Co., is used as an adsorbent. The commercial BSR (300-850um) is grinded to make fine-grain BSR with diameter 10-3000um. The performance by the fine-grain BSR is compared with that by the commercial BSR without grinding for each process of AMF (boron adsorption by BSR, boron desorption from saturated BSR using acid, and regeneration of BSR using base). In the process of boron adsorption from SWRO permeate water, the optimal performance is achieved at 1 g/L of BSR/solution ratio, 150 rpm of stirring speed, and 10 min of reaction time by using the fine-grain BSR, which results in maximum adsorption capacity of 11.68mg B/g BSR. Particularly the reaction time using the fine-grain BSR is shortened by 6 times compared to the commercial BSR. Furthermore, the adsorption capacity is increased by 3 times. In the process of boron adsorption from seawater, on the other hand, the optimal performance occurs at 0.1 g/L of BSR/solution ratio, 100 rpm of stirring speed, and 5 min of reaction time by using the fine-grain BSR, where the reaction time is 60 times shorter than that by the commercial BSR. In the meantime, there is no noticeable difference between SWRO permeate water and seawater in the efficiency of boron desorption from saturated BSR using sulfuric acid and hydrochloric acid. The optimal concentration and volume of sulfuric acid are 0.05M and 1.6L/kg-BSR, respectively, while those of hydrochloric acid are 0.25M and 2.2L/kg-BSR, respectively. Up to 100% of boron is desorbed under the optimal conditions. It is found that both commercial and fine-grain BSRs can be reused with only ±3% of variance in the efficiency of adsorption. The desorbed boron in acid solution is solidified into B(OH)3 by heating and cooling. In addition, the solid boron is formed as sodium borate and calcium borate by reacting with NaOH and Ca(OH)2, respectively, at 140℃.
리브가 있는 수축 및 확대 직사각형 채널에서 난류열전달과 마찰계수 특성
Turbine blade cooling, a common practice in modern aircraft engines, is accomplished among other methods by passing the cooling air through an open serpentine passage in the core of the blade. Furthermore, to enhance the heat transfer coefficient, the convergent/divergent passages modelling the blade passage are roughened with rib-shaped turbulence promoters, at which the rib surfaces comprise a large portion of the passage heat transfer area. Therefore, an accurate account of the heat transfer coefficient on the rib surfaces in the convergent/divergent channel is critical in the overall design of the blade cooling system. The experimental measurements of heat transfer and friction factors in the ribbed convergent/divergent channels are done. Thermal performance of the ribbed rectangular convergent/divergent channels are also compared with the square straight channel under three constraints: identical mass flow, identical pumping power, and identical pressure drop. Five(5) different studies on the ribbed convergent/divergent channels were considered as follows: 1.Effect of convergence ratio on heat transfer and friction factor in the channel 2.Effect of divergence ratio on heat transfer and friction factor in the diverging channel 3.Turbulent heat transfer and friction in rectangular convergent and divergent channels with ribs on one wall. 4.Effect of rib pitch on heat transfer and friction factor in a two wall divergent channel 5.Effects of angled ribs on turbulent heat transfer and friction factors in a rectangular divergent channel The major findings are as follows : 1) The friction factors increase and the convective heat transfer decrease with increasing the ratio of channel convergence. 2) The Nusselt numbers in the two sided heating are greater than those in the four sided heating. 3) The total friction factor and convertive heat transfer coefficients decrease with increasing the ratio of divergence of the channel. 4) Among the four channel (Dho/Dhi =0.67, 0.86, 1.16 and 1.49), the divergent channel of =1.49 has the highest thermal performance at the identical mass flow rate, and the divergent channel of =1.16 has the highest at the identical pumping power and static pressure drop. 5) The ratio of =6 shows the highest valve in the heat transfer and the ratio of =10 indicates the greatest friction factor in the ribbed divergent channel.
"수룡음" 중 "농" 아쟁선율 비교 분석 : 악기편성에 기하여
“수룡음”은 “자진한잎” 중 한곡으로, 아쟁이 편성된 정악합주 곡이다. 대개의 정악합주곡에서 정악아쟁은 주로 긴 지속음을 내며 주선율을 받쳐주는 역할을 한다. 정악아쟁은 주로 합주편성에서만 연주되는데 반해 “수룡음”의 경우 중주편성 연주뿐만 아니라 독주곡로서의 모색이 시도되어지고 있다. “수룡음”의 경우 합주 · 중주 · 독주편성 연주시 각각의 편성에 따라 아쟁선율에 변화가 있는데, 이에 본고는 “수룡음”의 악기편성에 따른 아쟁선율이 어떠한 변화를 보이고 있는지를 비교, 분석하고, 선율전개의 상관관계를 규명하였다. 이에 따른 결과는 다음과 같이 요약할 수 있다. 1) 1장 1장의 선율을 비교해 본 결과 총 32박 중 합주아쟁과 중주아쟁의 동일음은 6.25%(2박)이고, 유사음은 93.75%(30박)이다. 합주아쟁과 독주아쟁의 동일음은 100%(32박)이다. 중주아쟁과 독주아쟁의 동일음은 6.25%(2박)이고, 유사음은 93.75%(30박)이다. 중주아쟁은 합주아쟁보다 전반적으로 한 옥타브 낮은 선율진행을 보였고, 연속하는 같은 음은 연결하여 지속음으로 처리하는 특징을 볼 수 있다. 독주아쟁은 합주아쟁에서 추성과 같은 장식음을 추가하였고, 선율진행 양상은 동일하게 나타난다. 2) 2장 2장의 선율을 비교해 본 결과 총 27박 중 합주아쟁과 중주아쟁의 동일음은 18.52%(5박)이고, 유사음은 81.42%(22박)이다. 합주아쟁과 독주아쟁의 동일음은 88.89%이고(24박), 다른음은 11.11%(3박)이다. 중주아쟁과 독주아쟁의 동일음은 70.37%(19박)이고, 유사음은 18.52%(5박)이며, 다른음은 11.11%(3박)이다. 1장과 동일하게 중주아쟁은 합주아쟁보다 전반적으로 한 옥타브 낮은 선율진행을 보였고, 연속하는 같은 음은 연결하여 지속음으로 처리하는 특징이 나타난다. 종지형 또한 동일하게 나타난다. 독주아쟁은 합주아쟁에서 추성과 같은 장식음과 간음(間音)을 추가하였고 선율진행 양상은 동일하게 나타난다. 3) 3장 3장의 선율을 비교해 본 결과 총 37박 중 합주아쟁과 중주아쟁의 동일음은 94.6%(35박)이고, 다른음은 5.4%(2박)이다. 합주아쟁과 독주아쟁의 동일음은 91.9(34박)%이고, 다른음은 8.1(3박)%이다. 중주아쟁과 독주아쟁의 유사음은 86.48%(32박)이고, 다른음은 13.52%(5박)이다. 중주아쟁은 합주아쟁보다 전반적으로 한 옥타브 낮은 선율진행을 보였고, 연속하는 같은음은 연결하여 지속음으로 처리하는 특징을 알 수 있었다. 또한 합주아쟁의 선율진행에 사용된 간음을 중주아쟁에서는 삭제하여 선율을 진행하였다. 독주아쟁은 합주아쟁에서 추성과 같은 장식음과 간음을 추가하였고 선율진행 양상은 동일하게 나타난다. 4) 중여음 중여음의 선율을 비교해 본 결과 총 16박 중 합주아쟁과 중주아쟁의 유사음은 100%(16박)이다. 합주아쟁과 독주아쟁의 동일음은 87.5%(14박)이고, 다른음은 12.5%(2박)이다. 중주아쟁과 독주아쟁의 유사음은 87.5%(14박)이며, 다른음은 12.5%(2박)이다. 중주아쟁은 합주아쟁보다 한 옥타브 낮은 선율진행을 보였다. 독주아쟁은 합주아쟁에서 추성과 같은 장식음과 간음을 추가하였고 선율진행 양상은 동일하게 나타난다. 5) 4장 4장의 선율을 비교해 본 결과 총 27박 중 합주아쟁과 중주아쟁의 유사음은 100%(27박)이다. 합주아쟁과 독주아쟁의 동일음은 100%이다. 중주아쟁과 독주아쟁의 유사음은 100%(24박)이다. 중주아쟁은 합주아쟁보다 한 옥타브 낮은 선율진행을 보였고, 독주아쟁은 합주아쟁과 동일한 선율진행이 나타난다. 6) 5장 5장의 선율을 비교해 본 결과 총 48박 중 합주아쟁과 중주아쟁의 동일음은 37.5%(18박)이고, 유사음은 60.4%(29박)이며, 다른음은 2.1%(1박)이다. 합주아쟁과 독주아쟁의 동일음은 95.83%(46박)이고, 다른음은 4.17%(2박)이다. 중주아쟁과 독주아쟁의 동일음은 37.5%(18박)이고, 유사음은 56.25%(27박)이며, 다른음은 6.25%(3박)이다. 중주아쟁은 합주아쟁보다 전반적으로 한 옥타브 낮은 선율진행을 보였지만, 5장 4각의 경우 거의 같은 선율진행을 보인점이 1~4장과 다른점으로 살펴진다. 독주아쟁은 합주아쟁에서 추성과 같은 장식음과 간음을 추가하였고 선율진행 양상은 동일하게 나타난다. “수룡음”의 대여음을 제외한 장별 비교 결과를 종합하면 다음과 같다. “수룡음”은 대여음을 제외한총 187박 중 합주아쟁과 중주아쟁의 동일음은 32.1%(60박)이고, 유사음은 66.3%(124박)이며, 다른음은 1.6%(3박)이다. 합주아쟁과 독주아쟁의 동일음은 94.65%(177박)이고, 유사음은 0%(0박)이며, 다른음은 5.35%(10박)이다. 중주아쟁과 독주아쟁의 동일음은 20.85%(39박)이고, 유사음은 72.2%(135박)이며, 다른음은 6.95%(13박)이다. 중주아쟁은 합주아쟁과 독주아쟁에 비해 한 옥타브 낮은 선율진행을 하였고, 리듬을 단순화 하였으며, 독주아쟁은 합주아쟁의 선율에서 추성과 간음을 활용하여 선율의 진행을 더욱 다양하게 하였다. 이상의 연구를 통해 “수룡음”의 합주, 중주, 독주편성 연주시 아쟁선율을 비교함으로서, 편성별 아쟁선율을 밝힐 수 있었고, 아쟁의 선율은 각각의 편성에서 크게 다르지 않았다. 본 연구를 통해 합주음악에만 편성되던 아쟁의 중주와 독주로서 가능성을 확인하고, “Suryongeum", a Ajaeng formed Jeong-ak ensemble music, is one of the piece in "Jajinhanip". Most of Jeong-ak music Jeong-ak Ajaeng mostly supports main melody with sustaining sound. While most Jeong-ak Ajaeng is played in the form of ensemble, "Suryongeum" of Jeong-ak Ajaeng is played in the form of duet ensemble and even solo piece as well as in ensembles as usual. However, melodies of "Suryongeum" Ajaeng changes differently depending by its different forms of play; ensembles, duets and solo. To define those differences in melodies of Ajaeng "Suryongeum", I compared and analyzed relations between those differences of melodies. These followings are results. 1) The first movement By comparing the first movement of "Suryongeum" in ensemble, overall 32 beats in whole melodies, duet and solo melodies of Ajaeng plays same note in 6.25%(2beats) and similar note in 93.75%(30beats). Ensemble Ajaeng and solo Ajaeng plays 100 %(32 beats) same melodies. Duet Ajaeng and solo Ajaeng has same note in 6.25 %(2 beats) and similar note in 93.75%(30beats). Duet Ajaeng plays one octave lower melodies than ensemble Ajaeng and sustains following beat when same notes follow after. Solo Ajaeng adds ornaments such as Chuseong than ensemble Ajaeng but melodies flow same. 2) The second movement In the second movement, total 27 beats in melodies, ensemble Ajaeng and duet Ajaeng has 18.52 %(5 beats) same notes and 81.42%(22beats) same notes. Ensemble Ajaeng and solo Ajaeng has 88.89 %(24 beats) same notes and 11.11%(3beats) of different notes. Duet Ajaeng and solo Ajaeng plays 70.37 %(19 beats) same notes and 18.52%(5beats) of similar notes and 11.11%(3beats) of different notes. Same as first movement, Duet Ajaeng plays one octave lower melodies and sustains following beats which have continuing same notes than ensemble Ajaeng. Ending melodies are also same. Solo Ajaeng has ornaments and adds notes between each notes than ensemble Ajaeng. 3) The third movement On the third movement, overall 37 beats in melodies, ensemble Ajaeng and duet Ajaeng has 94.6 %(35 beats) of same notes and 5.4 %(2 beats) of different notes. Ensemble Ajaeng and solo Ajaeng has 91.9 %(34 beats) of same notes and 8.1 % (3 beats) different notes. Duet Ajaeng and solo Ajaeng has 86.48 %(32 beats) of similar melodies and 13.52%(5beats) of different notes. Duet Ajaeng plays one octave lower melodies than ensemble Ajaeng and continues following notes when same pitch note comes after and solo Ajaeng shows same melodies in ensemble Ajaeng but has added notes and ornaments. 4) Jungyeoeum Jungyeoeum(small movement between third and fourth movement), total 16 beats in melodies, ensemble ajaeng and duet ajaeng has 100 %(16 beats) similar notes. Ensemble ajaeng and solo ajaeng has 87.5 %(14 beats) of same notes and 12.5 %(2 beats) different notes. Duet ajaeng and solo Ajaeng has 87.5 %(14 beats) of similar notes and 12.5 %(2 beats) different notes. Duet Ajaeng plays one octave lower melodies than ensemble Ajaeng and sustains following beats which have continuing same notes. Solo Ajaeng plays same melodies flowing as ensemble music but has more added notes in the melodies. 5) The fourth movement On the fourth movement, overall 27 beats in melodies, ensemble Ajaeng and duet Ajaeng has 100 %(27 beats) of similar notes. Ensemble Ajaeng and solo Ajaeng has 100 %(27 beats) of same notes and duet Ajaeng and solo Ajaeng also plays 100%(27beats) of similar notes. Duet Ajaeng plays one octave lower than ensemble Ajaeng and solo Ajaeng plays same melodies as ensemble Ajaeng. 6) The fifth movement In the fifth movement, total 48 beats in melodies, ensemble Ajaeng and duet Ajaeng has 37.5 %(18 beats) same notes and 60.4 %(29 beats) similar notes and 2.1%(1beat) of different notes. Ensemble Ajaeng and solo Ajaeng has 95.83 %(46 beats) same note and 4.17 %(2 beats) of different notes. Duet Ajaeng and solo Ajaeng plays 37.5 %(18 beats) same notes and 56.25 %(27 beats) of similar notes and 6.25%(3beats) of different notes. Duet Ajaeng overall plays one octave lower melodies than ensemble Ajaeng but in fourth line(gak) of fifth movement, different from first to fourth movement, these had same melodies in same pitch range. Solo Ajaeng has ornaments such as Chuseong and has added notes along melodies than ensemble Ajaeng. By the results, among total 187 beats of "Suryongeum", ensemble Ajaeng and duet Ajaeng has 32.1 %(60 beats) of same notes, 66.3 %(124 beats) of similar notes, and 1.6 %(3 beats) of different notes. Ensemble Ajaeng and solo Ajaeng has 94.65 %(177 beats) of same notes, no matches in similar notes and 5.35 %(10 beats) in different notes. Duet Ajaeng and solo Ajaeng plays 20.85 %(39 beats) of same notes, 72.2 %(135 beats) of similar notes and 6.95 %(13 beats) of different notes. Compare to ensemble and solo Ajaeng, Duet Ajaeng has one octave lower melodies and simplifying rhythms while solo Ajaeng uses chuseong and ornaments to make more diverse melodies. Overall, on this thesis I compared each ensemble, duet and solo melodies of Ajaeng melodies in "Suryongeum" and defined those different characters of melodies. It only had slight differences but I could examine characteristics of each melodies. On this research I could confirm Jeong-ak Ajaeng, which almost all formed only in ensemble music in usual, as duet and solo music playing instruments also and reveal various musical changes of Jeong-ak Ajaeng.
이소시아네이트와 알카이닐다이메틸 알루미늄을 이용한 프로피올 아마이드의 합성
정성수 대구가톨릭대학교 대학원 2015 국내석사
Previously we observed and searched alkynyl ketones which is converted from many kinds of substituted nitrile with using alkynylaluminum reagents. From that time, we studied broadly about the reactant of alkynylaluminum reagents and its effect on multiple ranges of organic synthetic part. Alkynylaluminum, it is good substrate to make many kinds of ketones and it shows highly effective reaction in cross-linking of hetero bi-functional groups, allylic substitution reactions, synthesis of alkyne-substituted quaternary carbon, cyclo-addition reactions, Lewis Base directed cyclo-addition reaction and etc. And also it is worked easily to convert amidines from amides. Our study was progressed with using simple substituted isocyanate (R1) and general kinds of alkyne (R2) to synthesize propiolamide groups. Conventionally they have been prepared from the reaction of metal alkynylidene and amidation of alkynyl acids. So, it is important to develope efficient and easy procedure for the synthesis of propiolamides. As a part of ongoing program on the development of novel synthetic methods in organic synthesis, we report herein an efficient procedure for the synthesis of N-substituted propiolamides from isocyanates using alkynyldimethyl aluminum reagents. To verify the functional group tolerance, a variety of isocyanate substrates were reacted with alkynyldimethylaluminum reagents derived from wide range of terminal alkynes to provide desired products in excellent yield. All these results were get from GC-MS, 1H, 13NMR and High resolution Mass analysis.
정성수 韓京大學校 産業大學院 2005 국내석사
현재 우리나라에서 많이 사용되고 QUAL2E 모델과 QUAL2E 단점을 보완한 QUAL2K 모델을 비교·분석하기 위해서 대표적 도시하천인 안양천을 모의하였다. QUAL2K 모델은 QUAL2E에서 고려하지 못했던 부착조류, 탈질화 저니층-수체 상호작용 등 반응메카니즘을 추가하였고, CBOD도 sCBOD와 fCBOD 두가지로 나누어 모의 하였다. QUAL2E 모델은 수리학적 특성이 비슷한 11개 구간으로 나누어 모의하였다. QUAL2E는 0.2km 계산요소를 나누어 모의 하였고, QUAL2K는 계산요소 없이 QUAL2E 11개구간을 더욱 세분하여 30개 구간으로 나누어 모의 하였다. QUAL2K와 QUAL2E 모델은 2002년 9월 실측된 자료를 바탕으로 반응계수를 보정하였고 보정된 QUAL2K와 QUAL2E 모델을 이용하여 DO, BOD, Org-N, NH₃-N, NO₃-N, Org-P, Dis-P, Chl-a 등 8개 수질항목을 모의하여 비교·분석해 보았다. QUAL2K와 QUAL2E 모델의 모의결과 Org-N, NH₃-N, Org-P, Chl-a는 비슷한 결과가 나타났지만, DO, BOD, NO₃-N, Dis-P는 다른 결과가 나타났다. 그 이유는 QUAL2K에 추가모의한 부착조류와 탈질화, 저니층-수체의 상호작용, 유기고형물의 영향에 인한 것으로 판단된다. 부착조류에 영향으로 DO는 낮게 나타났고 유기고형물의 영향으로 BOD는 더 높게 나타났다. 저니층-수체의 상호작용과 탈질화의 영향으로 NO₃-N는 실측치에 가깝게 나타났다. 모의결과를 단순통계인자를 이용하여 평가하였다. 보정을 한 후 통계적 평가를 행한 결과, DO, NO₃-N, Org-P, Dis-P 등 전반적으로 QUAL2K가 QUAL2E 모델보다 상대오차와 분산계수가 더 작은 값을 나타내었고, 이것으로 QUAL2K 모델이 QUAL2E 모델보다 실제 자연현상을 설명하는데 있어서 더 높은 정확도와 정밀도를 가지는 것으로 판단되었다. In order to compare and analyze the stream quality model, QUAL2E and QUAL2K were put to be used for a representative urban stream, Anyang stream. The QUAL2K model includes additional reaction mechanisms: QUAL2K uses two forms of CBOD to represent organic carbon(sCBOD, fCBOD). It includes denitrofication, sediment-water interactions and bottom algae. In the QUAL2E model, the Anyang stream(23.4km) was divided into 11 reaches. QUAL2E reach was assumed to have uniform hydraulic and biochemical characteristics, and was subdivided into computational elements with 0.2km distance. QUAL2K model was divided into 30 reaches without elements. The QUAL2K and QUAL2E models were calibrated with data for September in 2002 survey. The water quality parameters calibrated QUAL2K and QUAL2E models are simulated DO, BOD, Org-N, NH₃-N, NO₃-N, Org-P, Dis-P and Chl-a. Simulation showed similar results for Org-N, NH₃-N, Org-P and Chl-a in both QUAL2K and QUAL2E models. but DO, BOD, Dis-P and NO₃-N were different in simulation results of both models. It was considered that those results were due to additional reaction mechanisms in the QUAL2K model. They are not included in the QUAL2E model. To test results of the QUAL2K and QUAL2E models, a simple statistical parameter by Ambrose and Roesch(1982) was used. The average error(E) and its associated relative error(RE) gauge accuracy and reveal systematic errors. The standard error of estimate(SE) and coefficient of variation(CV) measure the precision with which the tracks variation in data. According to the statistical test, the QUAL2K model represented less relative error and coefficient of variation than the QUAL2E model. therefore, the QUAL2K model was considers to have higher accuracy and precision than the QUAL2E model in explaining natural variations of nitrogen, phosphorus in the korean stream system.
정성수 경기대학교 정치전문대학원 2019 국내석사
우리 경제에서 일자리 문제가 핵심적인 이슈로 등장했다. 일자리가 부족하여 실업자가 증가하고 있어 좋은 일자리를 창출 하는 것이 중요한 정책적 과제라 할 수 있다. 일자리 창출의 주요 수단으로 창업이 효과적이다. 이에 따라 최근 들어 창업 활성화 분위기에 맞춰 많은 청․장년들이 창업 현장에 도전을 하고 있다. 하지만 경험 부족, 자금조달의 어려움, 체계적 창업교육의 부족 등으로 인하여 창업의 실패를 경험하는 경우가 많다. 창업자의 빠른 성공은 일자리 창출과 국민 경제에 기여하는 바가 크며, 연쇄 창업 및 해외 진출 등에 많은 선순환 효과를 발생하는 것으로 인식되어 있으므로 국가 정책이나 유관 기관들은 창업자의 성공에 조력하는 것이 현재 당면 과제로 떠오르고 있다. 창업기업의 고용 성과창출이나 영향 등에 관한 연구에 집중되어 있는 반면, 창업을 통한 일자리 창출 대안 모색 등에 대한 연구는 다소 미흡하다고 생각된다. 따라서 본 논문은 정책 방안까지 제시한 것으로 기존 연구와 다소 차별성이 있고, 학술적 및 정책적으로 볼 때 의미가 크다. 본 연구는 첫째 창업과 우리나라 일자리 실태에서 창업과 고용관계, 경제지표 변화에 따른 일자리 변화 추이 등을 설명하고, 둘째 과거 정권에서의 창업지원 정책이 무엇이었는지, 우리나라 창업 현황과 금융지원은 어떻게 이루어지고 있는지, 세 번째로 창업기업의 자금공급 현황과 자금수급의 문제점은 무엇인지를 살펴본다. 마지막으로 창업을 활성화하기 위해서는 어떤 제도적, 금융이 필요한지에 대한 대안으로 크라우드펀딩을 제시하면서 크라우드 펀딩의 특징과 시장참여자, 크라우드 펀딩현황, 크라우드 펀딩 플랫폼 조성 등을 설명한다. 좋은 일자리를 창출하는 창업을 활성화하기 위해서는 금융의 역할이 무엇보다 중요하다. 기술창업을 유도하고, 지속적으로 성장하기 위한 금융이 더욱 강화되어야 한다. 금융에서 역할은 융자 위주의 간접금융에서 벗어나 직접 금융이 더욱 확대되도록 해야 한다. 그런 의미에서 크라우드펀딩은 좋은 대안이 될 것이다. The issue of jobs has emerged as a key issue in our economy. Creating good jobs is an important policy task as the number of unemployed is increasing due to the lack of jobs. Start-ups are effective as a major means of creating jobs. As a result, many young and old people have recently challenged the start-up scene in line with the spirit of revitalizing start-ups. However, they often experience failure due to lack of experience, difficulty in financing, and lack of systematic education on start-ups. As the rapid success of startups contributes greatly to job creation and the national economy, and it is recognized that there is a lot of virtuous effects in the chain of start-ups and overseas expansion, it is now emerging as a challenge for national policies and related agencies to help with the success of start-ups. While the focus is on research on creating or influencing employment performance of start-up companies, the research on finding alternative ways to create jobs through start-ups is thought to be rather. Therefore, this paper even suggested policy measures, which are somewhat different from existing studies, and is significant in terms of academic and policy. This study explains the first, the status of start-ups and employment relations in Korea, and the trend of job changes in accordance with changes in economic indicators, and second, the status of start-ups in Korea and how financial support is being made, the current status of money supply by start-up companies and what are the problems of money supply and money supply. Finally, presenting crowdfunding as an alternative to what institutional and financial needs to boost start-up, describing the concept of crowdfunding, features of crowdfunding and market participants, crowdfunding status and the creation of crowdfunding platforms.