인스트루먼트 패널용 수용성 질감 도료의 물리적 성질

김억(Ok Kim),오우정(Woo-Jeong Oh),전용(Yong Chun),김영태(Young-Tae Kim),안재범(Jae-Beom Ahn),조영호(Youngho Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3

Physical properties of waterborne soft feel coatings for instrument panel were investigated. Soft feel coatings give warm and velvet touch for cold and hard plastic materials. Waterborne soft feel coating is composed with two parts. Part A contains polyester polyurethane dispersion (PE-PUD), OH-functional water dispersible polyurethane resin (PC-PUD) and OH-functional water dispersible alkyd resin (OH-PA). Part B contains hydrophilic hexamethylene diisocyanate trimer (HHDI). Soft feeling of coated panel was related with the amounts of PC-PUD and OH-PA. The physical properties of coated panel could be controlled by the NCO/OH ratio from Part A and Part B. Soft feeling was enhanced with relevant to PE-PUD content but the content of PE-PUD was limited because of weakening of coated film strength. For excellent touch and good property, the optimum composition of soft feel coat was PC-PUD(30%) and PE-PUD(20%). The results from all reliability tests satisfied soft feeling, scratch, chemical resistance and fogging.

수중 유기물처리를 위한 광펜톤반응의 최적조건 도출

오태협,이한욱,박성직,박재우,Oh, Tae Hyup,Lee, Hanuk,Park, Sung Jik,Park, Jae-Woo 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.1

Fenton is the reaction using the OH· radicals generating by interaction between hydrogen peroxide and Fe²⁺ which can oxidize the contaminants. Fe²⁺ ions are oxidized to Fe³⁺ ions by reaction with H₂O₂ and formed OH· radicals. UV-Fenton process includes the additional reaction that generates the OH· radicals by photodegradation of H₂O₂. In methylorange (MO) decolourization experiment with UV-Fenton, optimal Fe²⁺: H₂O₂ ratio was obtained at 1 : 10. Based on the obtained condition (H₂O₂= 10mM, Fe²⁺ = 1 mM) with/without UV-fenton experiment was carried out. Removal efficiency and sludge production were measured at 30 min. The case of w/o UV irradiation and only H₂O₂ was hardly treated and only Fe²⁺ showed 65% removal owing to coagulation. When UV-Fenton process in optimal ratio (Fe²⁺: H₂O₂ = 1 : 10), UV irradiation showed better removal efficiency than of w/o UV irradiation. Also, MO decolourization was a function of the hydrogen peroxide concentration (x₁), Fe²⁺:H₂O₂ ratio (x₂), and numbers of UV lamp (x₃) from the application of the response surface methodology. Statistical results showed the order of significance of the independent variables to be hydrogen peroxide concentration > numbers of UV l amp > Fe²⁺: H₂O₂ ratio.

共沈法에 의한 Ferroxplana (Ba₂Zn₂Fe O)의 合成과 磁氣特性

吳英佑,宋泰雄 慶南大學校 附設 工業技術硏究所 1986 硏究論文集 Vol.4 No.-

GHz대 통신에 사용되는 Ferroxplana (Ba₂Zn₂Fe??O??)를 제조하기 위하여 최적의 공침 조건과 건조 조건을 새로 고안한 기구를 사용하여 공침합성하였다. 이 방법으로 제조한 시료는 미세한 분말이었으며, 소결시편의 조성과 미구조는 X.R.D, DAT 및 현미경으로 조사하였다. 하소시편 내의 Zn₂Y의 활성화 에너지는 약 3.75-4.10×10⁴J/mole이었으며 소결시편에는 Zn₂Y상외 BaM과 Zn₂W상도 발견되었다. 이렇게 제조된 시편은 고주파 통신용 자기 코아로써 적용 가능하였다. In order to precipitate ferroxplana(Ba₂Zn₂Fe??O??), which is useful for GHz-band communication, the optimum co-precipitating and drying condition were investigated by use of a new apparatus. By the freezing-drying, aceton-compulsion drying, hot petroleum drying and calcining the co-precipitated mixtures, the fine and uniform powder was obtained, whose phase composition and microstructure were studied by X.R.D,, DTA and metallurgical microscope. In results, it was found Zn₂Y, BaM and Zn₂W were the representativ phases in calcined specimens and crystal growth activation energy of Zn₂Y was about 3.75-4.10×10⁴J/mole. The sintered specimens would be appreciated as useful magnetic cores for the high frequency communication.

간접적응 신경회로망을 이용한 안테나 축받이 시스템의 안정화

이오걸,김태우,박두환,이준탁,송효신 동의공업대학 1999 論文集 Vol.25 No.1

In this paper, the stabilization control problems of antenna pedestal system under the parametric variations and non-linearities such as gravity torque and under external disturbances were described. The proposed controller could stabilize the given antenna system by an indirect adaptive neural network controller. The proposed indirect adaptive neural network controller was consist of an indirect off-line model identifier by neural network and an adaptive on-line neural network controller, based on the reference model and the least square method. The designed controller was applied to an stabilization control of Inmarsat-M antenna pedestal system with the azimuth and the elevation axis. The simulation results were desirable and were superior to the conventional PID controller tuned by Ziegler-Nichols' method.

Wavelet을 이용한 정상 시계열 데이터 해석에 관한 연구

이오걸,이준탁,김태우 동의공업대학 1999 論文集 Vol.25 No.1

Wavelet analysis is applying to many fields such as the time-frequency localization of a time series and a time varying data. In this paper, a statistical testing based Wavelet power spectrum analysis for the stationary Nino3 Sea Surface Temperature(S.S.T) data was executed. Specially, the 95% confidence level for S.S.T was effective in searching the periods of El-Nino using various wavelet basis functions.

HDPE 개질 아스팔트 혼합물의 강도 및 변형특성

김광우,이기호,권오선,고태영 강원대학교 부설 석재복합신소재 제품연구센터 2004 석재연 논문집 Vol.9 No.-

본 연구는 폐비닐 펠렛을 도로포장재료로 재활용하여 자원절약 및 아스팔트 혼합물의 품질향상을 위한 연구이다. 이를 위하여 폐비닐의 첨가량별 배합설계를 수행하여 적정 폐비닐 첨가량과 최적 아스팔트 함량으로 편마암과 화강암 2가지 골재와 폐비닐인 RHDPE의 함량을 4가지로 혼합물을 제작하여 8종류의 재질 혼합물과 2종류의 무개질 혼합물을 제작하였다. 그리고 이 공시체에 대하여 마샬안정도, 간접인장강도 및 Kim test와 반복주행시험 등 실내시험을 통하여 혼합물의 특성을 분석하였다. 폐비닐 첨가량은 RHDPE가 8%일 때 안정도와 간접인장강도 모두 가장 우수한 것으로 나타났고 취성도 나타나지 않았다. RHDPE를 첨가한 혼합물에 대하여 Kim test를 수행한 결과 DR과 DS 모두 높은 상관성을 보였다. 그리고 반복주행시험에서는 RHDPE를 첨가한 혼합물이 일반 혼합물보다 우수하였다. 향후 많은 실험을 통해 RHDPE의 우수성을 입증한다면 소성변형 저항성에 우수한 재료로 이용될 수 있을 것이다. This study is a fundamental research for recycled high-density polyethylene (RHDPE) in asphalt mixture for improving roadway pavement. Marshall mix design was conducted and optimum asphalt content(OAC) was determined for dense-graded surface course mixture by RHDPE content. Marshall stability test, indirect tensile strength (ITS) test, wheel tracking trest and Kim-test were carried out to measure the characteristics of RHDPE-added asphalt concretes. From the results of this study, RHDPE in asphalt mixture if possible. It could be considered that adding too much RHDPE in asphalt mixture is not proper. The optimum content of RHDPE was appeared to be 8%. In Kim-test, statistical analysis was performed for each loading head and aggregate to find out correlation between S_(D) values and each rut parameter. The analysis result showed that S_(D) had very high coefficient of determination with rut parameters on the average.

쌍선형 유도기 모델을 위한 최적 안정화 제어기 설계에 관한 연구

李泰基,李五杰,禹靖仁,李浚柝 東義大學校産業技術開發硏究所 1992 産業技術硏究誌 Vol.6 No.-

An optimal Stabilization Technique for a bilinear induction motor model is introduced. This technique includes two parts ; the one is an stabilization control using Lyapunov Function which has the form of a sum of liner and quadratic function of the state variables, and the other is an optimalizing control using the performance index which depends on the choice of the elements of the Lyapunov matrices. Therefore, induction moter is drived with the smaller overshoot of the ones, simulation results are obtained from a digital computer.

밀폐형 온실의 과습 조건과 무선통신 성능 관계 규명

김태균, 송정원, 박소정, 오종우 忠北大學校 農業科學硏究所 2017 農業科學硏究 Vol.33 No.1

In order to utilize the ubiquitous sensor network technology, it is necessary to identify the communication characteristics of the sensor node. The purpose of this study is to investigate the wireless performance to be related the environment (i.e. humidity) which can cause data loss in the greenhouse environment. The performance of wireless communication was conducted in the constant temperature and humidity device. The results of performance for Zigbee communication were not affected by the humidity. The Zigbee communication without the data loss would be more effective to control the environment in the greenhouse.

비간섭 제어에 의한 반송용 편측식 선형 유도전동기의 초저속제어

이오걸,신동률,김태우 동의공업대학 1998 論文集 Vol.24 No.1

We proposed an ultra low speed control or the SLIM(Sing1e-sided Linear Induction Motor) for a conveyance system using decoupled thrust control. The voltage equations of SLIM are expressed on the suitable α-β axis by the proposed equivalent circuit, which can analyze the characteristics thrust and normal force and so on. These control methods, which include the slip angular frequency control and the decoupling control for the thrust and normal force by analyzing these parameters, and can be successfully driven without interfering with each axis. These results exemplify the linear drive of SLIM with the reference value.

標識鳥에 依한 韓國産 철새集團의 季節的 分布와 그의 生産(Ⅱ)

元炳旿,禹漢貞,具太會,尹茂夫 慶熙大學校 1969 論文集 Vol.6 No.-

Seasonal distribution and ecology of migrant bird populations were studies by mist-netting and banding primarily in the area of Kyunggi-do, Korea during 1967―1968. 1. From 1 January 1967 to 31 December 1968, a total of 57,087 birds of 105 species were banded in Korea. 527 (237 returns) recoveries have been reported in Korea(outside of baning sites) and 26 recoveries of 7 species from abroad. 2. Through a nationwide preliminary survey on the colonial breeding sites of Ardei dae, 14 breeding colonies were found, and, as a result counted 6340 birds of 5 species and 1580 nestling banded. (See Table 3,4 and Fig. 1). 3. Band returns of the House Swallow banded the previous year obtained within Kyunggi-do, showed that the percentage of returns was 5.66% of 1694 adults and 0.66% of 8600 nestlings. Although the returns are invitably lower than the actual number banded, some tendency as to age is indicated, (Table 12). 4. Based on 208 recoveries at nesting and at roosting sites, the distance beween the two was within a radius of 25㎞. (see Fig. 2 and Table 14). 5. An analysis of age composition and ratio sex of some migrants, and their body wieghts.