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.

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.

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.

4루트 방식에 의한 방전관용 안정기 개발

이오걸,김태우,김종기,송호신,이준탁 동의공업대학 2000 論文集 Vol.26 No.1

This paper was development a discharge tube ballast by 4 root method in order to wave improvement of high power factor and high efficiency. The discharge tube ballast consists of a power factor correction circuit and a correction circuit on switching frequency of inverter. Instead of passive power factor circuit, active power factor circuit is adopted. Because it has the advantage of size. weight, total harmonic distortion, out DC voltage regulation, and power factor. The power factor circuit with MG34262 is controlled by variable frequency discontinuous mode. Results experiments, discharge tube ballast by 4 root method showed to have excellent in the discharge tube ballast's operation and characteristics.

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.

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.

Behc¸et 병에서 말초혈액 호중구의 Superoxide anion (O₂^(-)) 생성 능력에 관한 연구

신용우,오칠환,김태진,김수남 고려대학교 의과대학 1991 고려대 의대 잡지 Vol.28 No.1

The present study was carried out to investigate the mechanism of inflammtion and tissue injury in Behcet's disease. The generation of O₂(-) was assessed by superoxide dismutase inhibitable cytochromec reduction method. The O₂(-) generation activity was expressed as nanomoles of cytochrome c reduced per 1×10^(6) neutrophils. The O₂(-)generation activity of peripheral blood neutrophils of the patients was compared to that of healthy controls, and was analyzed in the respect of clinical severity, exacerbation and improvement, pathergy reaction, and tetracycline treatment for oral ulcer. The results were summarized as follows : 1. The O₂(-) generation activity of neutrophils in Behcet's disease was markedly increased as compared with that of healthy controls. 2. In the patient group with severe clinical symptoms, exacerbated clinical course and positive pathergy reaction, the O₂(-) generation activity of neutrophils was increased. 3. The O₂(-) generation activity of neutrophils was markedly decreased in the patient group treated with tetracycline for oral ulcer.

무용전공 대학생의 스트레스 요인 분석

한태준,우태화,오상훈 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.1

Stressors which dance specialty university student have been suffered from during activity in dance were analyzed through open-questionnaire, the participants in this survey were 228 dance specialty university student, sort questions according to the affinity and similarity of them in the aspects of conception, questionnaire was summed up in six factors and twenty questions. Arranged twenty questions were determined by the fifth levels of Likert's type scale to be good for responses. As the result of analysis of responded contents, they were sorted as main six factors like that university professor, training, school, finance, individual, rest. As Jim Taylor told, dancers are apt to have disease and injuries when dancers are under the stress, and those who have abnormal increase of decrease in one's own weights can have more stress. The way of conducted a good performance by dance specialty university student is that dancers should have responsibility as worker and have pride as artist, many study and analysis will be necessary if there are any other in actual circumstances or not in actual circumstances.

충남지역 나환자에 대한 사회의학적 조사연구

박연우,오장균,이태용,심운택 충남대학교 의과대학 지역사회의학연구소 1990 충남의대잡지 Vol.17 No.2

We studied through February 1989 to August 1989 to investigate the demographic characteristics, disease status and deformity of leprosy patients registered at Chungnam provincial area on December 31, 1988. The results were as follows: 1. Older than 40 years of age occupied 83.3%, and most patients lived at his or her own home as farmer or stock breeder. 2. The infection source was more the extrafamilial than the intrafamilial source and the most common initial symptoms and signs by body site were sensory paralysis on extremities and infiltration on face and macule on trunk. 3. The deformity was higher in male than female, older the age and much more the deformity. 4. The deformity was higher in T type than L type, and more recent onset of disease and shorter the duration between the onset and the register of disease, more lighter the deformity. The settlement villiger than domiciliary and the group of patientnts being treated at health center than leprosy association, the deformity was heavier.

알쯔하이머병의 단일 광전자 방출 뇌전산화 촬영에서 전형적인 유형과 관계를 보이는 요인

곽용태,한일우,방오영,박찬희,구민성 大韓神經精神醫學會 2001 신경정신의학 Vol.40 No.3

연구목적 : 최근 기능적 영상진단의 발전은 치매 환자의 진단에 많은 도움을 주고 있으며 이중 단일광자방출전산화단층촬영(SPECT ; single photon emission computed tomography)은 알쯔하이머 병의 특징적인 양측 두정측두엽의 혈류 감소를 보이므로 알쯔하이머 병의 진단에 많이 사용되어지고 있다. 본 연구는 알쯔하이머병의 SPECT 소견을 분석함으로써 알쯔하이머병의 진단에 있어서 SPECT 검사의 유용성 및 알쯔하이머병에서 전형적인 유형에 영향을 미치는 요인이 무엇인지를 규명한다. 방 법 : NINCDS-ADRDA진단 기준에 의거한 probable AD환자 26명을 대상으로 SPECT 검사를 시행하였으며 이중 14명은 전형적인 SPECT 소견을 보였으며 나머지 12명은 비전형적인 SPECT소견을 보였다. 치매의 정도는 Mini-Mental State Examination(MMSE)에 의하여 결정하였고 SPECT소견은 2명의 핵의학과 전문의의 합의에 의하여 정성적으로 판독하여 분석하였다. SPECT의 전형적인 소견과 연관이 있는 요소들을 확인하기 위하여 판별함수분석을 시행하였다. 결 과 : 알쯔하이머 환자에서 SPECT의 민감도는 53.8%이며, 조기 발병군의 경우에는 민감도가 76.9%이었다. 알쯔하이머의 전형적인 형태인 양측성 두정측두엽에 혈류량이 감소한 경우는 조기 발병군에서 유의하게 관찰되었으며, 이외에 이환기간, 교육정도, 성,병의 진행정도, 아포지단백E등은 유의한 연관성이 없었다. 결 론 : SPECT검사의 민감도는 높지 않으나 이를 조기 발병군에서만 적용하였을 경우 그 임상적 유용성이 높을 것으로 생각되며 조기 발병군에서 SPECT검사의 민감도가 만기 발병군에 비하여 유의하게 높은 것으로 보아 알쯔하이머병이 단일하지 않고 이질적인 집단의 증후군일 가능성이 높을 것으로 생각된다. 즉 SPECT검사가 알쯔하이머병의 진단뿐 아니라 병태생리적 기전의 이해에 도움이 될 것으로 생각되며 앞으로 정량화와 많은 중례를 확보하여 이에 대하여 좀더 규명할 필요가 있을 것으로 생각된다. Objectives : During the past few years, the development of functional brain imaging techniques has allowed to describe brain impairment in cognitive disorders. Among them, based on the observation of bilateral parietotemporal hypoperfusion in Alzheimer's disease(AD), single photon emission computed tomography(SPECT) is advocated by some as powerful diagnostic tool in the evaluation of demented patients. The aim of this study is to investigate the usefulness of SPECT in the diagnosis of AD and to clarify the associated factors of parietotemporal hypoperfusion, the typical SPECT pattern of Alzheimer's disease(AD). Methods : We reviewed the SPECT scans of 26 patients fulfilling NINCDS-ADRDA criteria for probable AD, 14 with typical pattern of SPECT and 12 with atypical pattern of SPECT. Dementia severity was assessed by the Mini-Mental State Examination. Inage interpretation was done visually by the consensus opinion of 2 experienced nuclear medicine physicians who were blind to clinical information. To estimate the association of typical pattern of SPECT with other variables of interest, discriminant function analysis was done. Results : Though the overall diagnostic sensitivity of SPECT in AD was 53.8%, it was 76.9%, in early-onset AD patients. Typical pattern of SPECT was more frequent in the patients with early onset on the symptoms. Duration of symptoms, duration of education, se, severity of disease was not associated with this SPECT pattern. Conclusion : These findings may be useful in the clinical setting and point to heterogeneity of AD according to age at onset.