논문 : 금속성 응집제와 모노클로라민의 상호작용이 Polyamide계 RO막 성능에 미치는 영향

김경화 ( Kyung Hwa Kim ),홍승관 ( Seung Kwan Hong ),박찬혁 ( Chan Hyuk Park ),윤성로 ( Seong Ro Yoon ),홍성표 ( Seong Pyuo Hong ),이종화 ( Jong Hwa Lee ) 대한상하수도학회 2006 상하수도학회지 Vol.20 No.4

The bench-scale chlorine exposure study was performed to investigate the effect of pretreatment by free chlorine and monochloramine (NH2Cl) on the performance of RO membranes made of polyamide (PA). Feed monochloramination at 2㎎/L did not cause significant productivity loss compared to free chlorine. However, metal coagulants reacted with monochloramine, the PA membrane suffered from a gradual loss of membrane integrity by chlorine oxidation, which was characterized as a decrease in salt rejection. Especially, RO membranes exposed to alum coagulants with monochloramine revealed the salt rejection lower than those exposed to iron coagulants. XPS membrane surface analysis demonstrated that the chlorine uptake on the membrane surface increased and carbon peaks were shifted significantly when exposed to alum coagulants with monochloramine.

Incidental Left Ventricular Thrombus Visualized by Cardiac Magnetic Resonance Imaging with a Normal Left Ventricular Systolic Function

Sang Mi Ro1,Sung Ho Her,Sol Mi Huo,Kuhn Park,Jong Bum Kwon,Dong Jae Lee,Hyun Jin Noh 조선대학교 의학연구원 2015 The Medical Journal of Chosun University Vol.40 No.3

Left ventricular (LV) thrombi may be caused by various conditions, particularly myocardial infarction. In most cases, LV thrombus occurs in patients with a significantly reduced ejection fraction. A LV thrombus is extremely rare in patients with normal LV function. We report a case of LV thrombus initially detected on transthoracic echocardiography and confirmed using cardiac magnetic resonance imaging in a patient with normal LV wall motion. We highlight the rarity of this condition and the usefulness of cardiac magnetic resonance imaging in the diagnosis of LV thrombus.

혐기성 소화의 동력학적 해석 : 有機酸 構成比에 따른 嫌氣性 消化 Anaerobic digestion with Component ratios of organic acids

노기현,장성호,안종수,전기일,김수생 동아대학교 환경문제연구소 1994 硏究報告 Vol.17 No.2

This research on organic acid and its component ratio (H_(AC) : H_(pt) : H_(Bu)) mainly produced in acid formation steps of anaerobic treatment process. From comparing the above experimental results with digestion efficiency of acetic acid used as substrates, I can find the conclusion as follows : 1. Removal efficiency for component ratios of organic acid is 64.3-98.6%, 59.6-98.2 %, respectively, varied with HRT of 3-20 days. 2. For l0days of HRT, in order to investigate the effects of component ratio of organic acid, when its component ratio(H_(ac) : H_(pt) : H_(bu)) is 100 : 0 : 0, 50 : 25 : 25, 28 : 38 : 34 and 0 : 50 : 50(as COD), respectively, effluent concentration is 464mg/l, 666mg/l, 832mg/l and 1,148mg/l, respectively. 3. Component ratio of menthane gas for organic acids represents 55-70%, with variation o: HRT, 3-20days. 4. When the component ratios of organic acid(H_(ac) : H_(pt) : H_(bu)) is 50 : 25 : 25 and 23 : 38 : 34(as COD), methane production per COD removal for HRT of 3-20days is 0.27~0. 32, 0.21~0.30. 5. From the mass balance relationship, when the component ratios of organic acid is 50 : 25 : 25 and 28 : 38 : 34(as COD), methane production ratio, varied with HRT of 3days, 5days, l0days, 15days and 20days in 49.6%, 66.4%, 77.5%. 85.1% and 89.7%, respectively and 39.1%, 56.3%, 68.3%, 76.3%, 83.9%, respectively.

3축 마이크로 공작기계용 자기예압 공기베어링 스테이지의 정, 동적 특성

노승국,Kornel F. Ehmann,Yoon, Hyung-Suk,박종권 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

In this paper, the static and dynamic stiffness of the air bearing stage for micro-micro machine tool are examined experimentally. For stiffness and precision concerns, air bearing stages are adapted for 3-axis micro-milling machine which is size of 200x200 mm². The air bearings in the stage are preloaded by permanent magnets to achieve desired bearing clearance and stiffness for vertical direction. As the stiffness of the air bearing is primary interests, static stiffness test were performed on XY stage in Z direction and Z column in Y direction. Dynamic test were performed on XY stage and Z column, respectively. Both static and dynamic tests were performed in different air pressure conditions. The vertical stiffness of XY stage is about 9N/μm where Y stiffness of Z column is much smaller as 1N/μm because of the large moment generated by Y force on the column.

초등학교 고학년 학생의 성별 , 학년별 , 체형인식도와 식행동 및 식품기호도 비교

노희경,박종 한국식생활문화학회 2001 韓國食生活文化學會誌 Vol.16 No.2

This study was undertaken to assess grade and gender differences in dietary behavior, food preference and perception about body image of students in 4, 5 and 6th grades in elementary school in Kwangju. Anthropometric data showed that mean height and weight were 137.98±6.79㎝, 32.69±6.09㎏ in the 4th grade, 144.11±6.91㎝, 36.88±7.60㎏ in the 5th grade and 151.52±7.47㎝, 42.68±8.06㎏ in the 6th grade. Height and weight of male and female students of each grade were very similar to those of the Korean standard Growth data. Females in the 5th and 6th grades were taller than those in male students, which suggested the height growth spurt in females. Furthermore, both genders showed marked variability even in the same group. All the three different obesity indices(BMI, Ro¨hrer and % of ideal body weight) showed higher value in males than in females consistently. Male respondents desired taller and heavier body shape while females perceived they were heavy and desired only taller and thinner body image. There were significant differences in satisfaction with height, weight and body image by grade(P<0.05). 36.7% of subjects responded that they did not eat despite hunger. In higher grade they felt guilty after eating sweet things. Strikingly, it was noted a small number of students tried to take a diet pills or vomited on purpose. Data on food preference showed that female did not like sweet food and pork. While male students preferred red meat and chicken. Thus result indicated that there was a great difference in food preference by gender.

갑상선기능 항진증에서 혈청 Thyroglobulin치의 진단적 의의

노흥규,이종화 충남대학교 의과대학 지역사회의학연구소 1983 충남의대잡지 Vol.10 No.2

The serum levels of thyroglobulin (TG) were measured by RIA method in the patients with untreated hyperthyroidism and those treated with anti-thyroid drug therapy to evaluate the prognostic significance of serum TG in the Dept, of Int. Medicine, CNU Hospital since Feb, 1983. The result were as follows: 1. The mean serum TG level in 31 untreated hyperthyroidism patients was 64.9±35.3 ng/ml and was significantly higher than that of normal controls, 20.41±5.5 ng/ml 2. The mean serum TG level in 17 treated hyperthyroidism patients was 54.4±20.3 ng/ml and there was no significant difference compared with that of untreated patients. 3. Despite of no significant difference, the mean serum TG level is slightly decreased in treated patients and it means that the measurement of serum TG level before and after treatment is worthy to evaluate the thyroid functional status after treatment in hyperthyroidism.

반도체 패키징 검사장비의 구조 동특성 개선에 관한 연구

노승국,박종권,이혜진,최석우 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

The dynamic performances, such as natural frequency, damping and dynamic compliance are playing bigger roles for high speed inspection equipments for the modern semiconductor production systems. In this study, the dynamic characteristics of the prototype of a inspection system was has been evaluated using ANSYS based modal and harmonic analysis. The inspection equipment need to be operated in high acceleration over 1G with short settling time. The computation and experiment shows that the supporting frame structure of the machine should have enough dynamic stiffness to reduce residual vibration caused by movement of the stages.

고속 밀링 주축용 자기베어링 시스템의 디지털 제어기 설계

노승국,경진호,박종권 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-

The demand of high speed machining is increasing because the high speed cutting provides high efficiency of process, short process time, improved metal removal capacityand better surface finish. Active magnetic bearings allow much high surface speed than conventional ball bearings and therefore greatly suitable for high speed cutting. The automatic control concept of magnetic bearing system provides ability of intelligent control of spindle system to increase accuracy and flexibility by means of adaptive vibration control. This paper describes a design and development of a milling spindle system which includes built-in motor with power 5.5 kW and maximum speed 70,000rpm, HSK-32C tool holer and active magnetic bearing system. Magnetic actuators are designed for satisfying static load condition. The Performances of manufactured spindle system was examined for its static and dynamic stiffness, load capacity, and rotational accuracy. This spindle was run up to 70,000rpm stably, which is 3.5 million DmN.

각종 갑상선질환에서 혈청 유리 T_3의 진단적 의의

노흥규,이강욱,이종화 충남대학교 의과대학 지역사회의학연구소 1984 충남의대잡지 Vol.11 No.2

To estimate the diagnostic significance of serum free T_3 in various thyroid diseases, the serum levels of free T_3, T_3, `ree T_4, T_4 and TSH were measured by radioimmunoassay method in 43 cases of euthyroid thyroid diseases, 19 cases of hyperthyroidism, 2 cases of primary hylothdism and 10 cases of normal subjects as controls at the Dept. of Internal Medicine, CNUH, since January to July, 1984. The diagnostic sensitivity and specificity of each hormone level were calculated according to the clinical diagnosis of the cases. The results were as follow; 1. The serum levels of thyroid hormones in normal controls were; free T_3 : 6.68±2.1 pmol/ml, T_3: 1.24±0.49 ng ml, free T4: 1.27±0.38 ng/dl, T_4, : 7.80±2.04 ug/dl and TSH :1.87±0.9uU/ml(M±2SD). 2. The diagnostic sensitivity of hyperthyroidism was 100% in serum T_3, free T_4 and T_4 , 84% in _fT_3 but the specificity was 93% in _fT_3, 92% in _fT_4. 3. The diagnose c sensitivity was highest as 86% in _fT_3 and _fT_4 while the specificity was 100% in _fT_4, 80% in _fT_3. With the above results, it can be concluded that measurement of serum _fT_4, and _fT_3 levels is the most specific and sensitive measure in diagnosing the hyperthyroidism and euthyroid thyroid diseases.

자기 소호형 소자를 사용한 D급 고주파 인버터의 특성 평가 및 설계에 관한 연구

노채균,김동희,김종해,배영호 嶺南大學校 工業技術硏究所 1995 工業技術硏究所論文集 Vol.23 No.2

This paper investigates and compares operating characteristics of the main power conversion circuit and extension of safety operating zone etc in case of use switching device of voltage-fed type high frequency Inverter with self-turn-off device to a case of using nature-commutated type devices. In addition, this paper induced operating characteristics of the main power conversion circuit by examination to normalized parameter. This paper propose that a base data of the main power conversion circuit of characteristics evaluation for frequency characteristics, output characteristics and load characteristics etc.