자기진단형 위상제어에 의한 단상유도전동기의 특성 및 모니터링 시스템에 관한 연구

조금배,박수강,백형래,임양수,이성길 조선대학교 에너지.자원신기술연구소 2003 에너지·자원신기술연구소 논문지 Vol.25 No.2

The three-phase induction motor is rugged, reliable, long-lived, self-starting, smooth-running. But it is relatively inexpensive and three-phase power in not available everywhere, so if possible we need single-phase motor with the same characteristics. In fact, single-phase induction motors have excellent characteristics and outnumber the three-phase variety. Most of the small electric motors used in home, farm, or office are single-phase induction motors of one type or another. This electric motors application field need most energy saving type drive according to enlargement of electronic goods and to tend high class. The paper is proposed a various phase control methods for energy saving of single- phase induction motor. The controllers that are embodied by each method can use by various usage according to each performance and it is considered that application may help in the electrical energy saving because is possible to other electrical appliances.

폐경기 여성에서의 Cyclofenil의 효능에 관한 연구 : 갱년기 장애 및 Ca 장흡수에 관하여

노흥규,윤상임,성기양,이경숙,이강욱 충남대학교 의과대학 지역사회의학연구소 1991 충남의대잡지 Vol.18 No.1

In postmenopausal syndrome, most common symptoms are those of vasomotor irritability such as hot flush and palpitation, irritable bladder symptoms and dyspareunia according to atrophy of urogenital epithelium, anxiety, nervousness, depression and insomnia. Approximately 40 percent of women in postmenopausal period develop symptoms serious enough to seek medical assistance. Among non-steroid agents, cyclofenil(4, 4' cyclohexidene methlyene diphenoacetate) is known to be a quite interesting substance according to the action at the level of the hypophyseal and hypothalamic centers by reducing the incretion of FSH and restoring normal endorphin, dopamine and norepinephrine activities, thus favorably affecting the whole postmenpausal neurovegutative symptomatology. In order to evaluate effect of cyclofenil on postmenopausal symptomatology and calcium metabolism, we examined 32 patients with postmenopausal syndrome before and after 200mg/day of oral cyclofenil treatment for 30-60 days. The results were as follows: 1. With 30 days of cyclofenil administration, subjective symptoms such as facial flush, palpitation, anxiety, nervousness and dyspareunia were improved significantly (p<0.001, p<0.001, p<0.01, p<0.005, respectively). But insomnia and depression were improved significantly after 60 days of cyclofenil administration (p<0.05, p<0.001, respectively). 2. Intestinal calcium absorption rate disclosed tendency of improvement without statistical significance 30 days after cyclofenil treatment. 3. Serum calcium and phosphorus level were not changed significantly before and after cyclofenil. 4. There was no definite evidence of side effects such as uterine bleeding due to cyclofenil. In conclusion, we thought that cycofenil is effective in management of postmenopausal syndrome but for the effect on calcium metabolism, further evaluation should be needed.

ALMOST SPLIT SEQUENCES FOR COMPLEXES VIA RELATIVE HOMOLOGY

YANG, GANG Korean Mathematical Society 2015 대한수학회지 Vol.52 No.5

We use methods of relative homological algebra on the category C(mod${\Lambda}$), of complexes of finitely generated modules over an artin algebra ${\Lambda}$, to give some characterizations of almost split sequences.

HOMOLOGICAL PROPERTIES OF MODULES OVER DING-CHEN RINGS

Yang, Gang Korean Mathematical Society 2012 대한수학회지 Vol.49 No.1

The so-called Ding-Chen ring is an n-FC ring which is both left and right coherent, and has both left and right self FP-injective dimensions at most n for some non-negative integer n. In this paper, we investigate the classes of the so-called Ding projective, Ding injective and Gorenstein at modules and show that some homological properties of modules over Gorenstein rings can be generalized to the modules over Ding-Chen rings. We first consider Gorenstein at and Ding injective dimensions of modules together with Ding injective precovers. We then discuss balance of functors Hom and tensor.

孔子的“中庸”智慧

???(Yang Feng-Gang) 동아인문학회 2008 동아인문학 Vol.14 No.-

"The doctrine of the mean"as the basic ideas and concepts of the Confucianism, has had a long-time and the profound influence to the Chinese cultural development, meanwhile, it also has played an important role to shape the culture of psychological structure and way of life of the Chinese people. It can be said that "the doctrine of the mean"has become a unique characteristics of the Chinese culture. However, the wisdom have suffered all sorts "the hypocrite"and the vulgarized misregistration and misinterpret for a long time. Especially in the present time, to many people, "the doctrine of the mean" have been understood and criticized as the attitude towards the smooth sophistication and ambiguity, the rules of life skills. In this context, "the doctrine of the mean"has completely lost its original connotation of the spirit. This article attempts to interpret and study its real meaning of "the doctrine of the mean" in Confucius’s context and in the Chinese thought's intrinsic sight races. Through studying and explanation to the related documents, this article think that "the doctrine of the mean"idea is a kind of political ideals in ancient civilization period, it is expressed, established and formed in the political realm and through political expression in the most early time. Confucius summarized and has inherited this ideological tradition and its thinking resources, and has developed its connotation greatly in the value standard position, has opened a brand-new ideological vision. In Confucius's thought , "the doctrine of the mean"wisdom can be understood as a kind of way of thinking, a kind of political ideal, a kind of life attitude, a kind of ideal personality, a perfect aesthetic ideal and so on. "the doctrine of the mean" wisdom left its deep impression and marks in Chinese traditional political philosophy, philosophy of life, aesthetics and artistic philosophy in its own way. And also, it has established the basic and profound characteristics and direction of Chinese traditional culture. Along with Confucianism's as its own development and evolution, "doctrine of the mean"thought also has been expanding and enriching, and entrusts with all sorts ofdifferent interpretations and explanations, is becoming the essencial spirit and the core value nerve of Confucianism and soaks deeply in the blood of Chinese culture. Therefore, understanding of Confucius "doctrine of the mean" wisdom equitably is very important for understanding "the doctrine of the mean"inner logic of thinking, for understanding the trajectories of development of Confucianism itself, for understanding the energetic quality of Confucianism, as well as for understanding our own culture cultural root and background, has the very vital significance.

An automated longquan celadon glaze thickness measurement method based on optical coherence tomography

Yang Zhou,Longjie Shi,Gang Ceng,Tiebing Liu,Yang Shi,Zhengwei Chen,Fenglin Wang,Yuefeng Ceng 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.3

The thickness of glaze is one of the important indicators in the quality evaluation of Longquan celadon. But till now, there isno automatic and non-destructive method to measure it. In order to satisfy this demand, an automated method has beenproposed to measure the glaze thickness based on optical coherence tomography (OCT) technique. According to themorphological characteristics of celadon glaze in OCT image, the proposed method locates the upper and lower boundariesof the glaze layer, then the glaze thickness is automatically calculated after the axial resolution calibration of the OCT imagesfor different categories of Longquan celadon. In the experiment, the glaze OCT images of 6 different categories of Longquanceladon were applied in the glaze thickness estimation. By comparing with the physical measuring result, this method is provedto be able to measure the glaze thickness rapidly and non-destructively and the performance is enough to meet the demandof the industrial application.

Research on Target Detection in Sports Video

Gang Liu,Yang Liu,Yang Wang,Jingmeng Sun 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.2

For moving objects detection, a background subtraction algorithm based on adaptive Gaussian mixture model is proposed in order to extract moving regions. The OTSU algorithm is researched in order to adapt to the changes in the background images; In order to accelerate model updating rate, a novel mechanism is the combination of expected sufficient statistics and L-recent window.

Modeling net energy requirements of 2 to 3-week-old Cherry Valley ducks

Yang Ting,Yu Lexiao,Wen Min,Zhao Hua,Chen Xiaoling,Liu Guangmang,Tian Gang,Cai Jingyi,Jia Gang 아세아·태평양축산학회 2020 Animal Bioscience Vol.33 No.10

Objective: A total of three hundred unsexed ducks were utilized to estimate net energy requirements of maintenance (NEm) and weight gain (NEg) for 2 to 3-week-old Cherry Valley ducks and to establish a model equation to predict NE requirements using the factorial method. Methods: To determine the apparent metabolizable energy (AME) of the diet, fifty 7-day-old ducks at approximately equal body weights (BWs) were randomly assigned into five groups that were fed at different levels (ad libitum, 85%, 75%, 65%, and 55% of ad libitum intake), and the endogenous acid-insoluble ash as indigestible marker. The two hundred and fifty 7-day-old ducks were used for a comparative slaughter experiment. At the beginning of the experiment, ten ducks were sacrificed to determine the initial body composition and energy content. The remaining ducks were randomly assigned into five groups (same as metabolic experiment). Ducks of the ad libitum group were slaughtered at 14 and 21-day-old. At the end of the experiment, two ducks were selected from each replicate and slaughtered to determine the body composition and energy content. Results: The results of the metabolizable experiment showed AME values of 13.43 to 13.77 MJ/kg for ducks at different feed intakes. The results of the comparative slaughter experiment showed the NEm value for 2 to 3-week-old Cherry Valley ducks was 549.54 kJ/kg of BW0.75/d, and the NEg value was 10.41 kJ/g. The deposition efficiency values of fat (Kf) and crude protein (Kp) were 0.96 and 0.60, respectively, and the values of efficiency of energy utilization (Kg) and maintenance efficiency (Km) were 0.75 and 0.88, respectively. Conclusion: The equation for the prediction of NE requirements for 2 to 3-week-old Cherry Valley ducks was the following: NE = 549.54 BW0.75+10.41 ΔW, where ΔW is the weight gain (g).

Hydraulic components’ matching optimization design and entropy production analysis in a large vertical centrifugal pump

Gang Yang,Xutao Zhao,Desheng Zhang,Linlin Geng,Xueqi Yang,Xiongfa Gao 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.11

The large vertical centrifugal pump is the core power equipment for longdistance water division and large-scale irrigation projects. The power of the matching motor can reach 40 MW. In view of reducing the operating energy consumption of this kind of pump, the efficiency under the design condition was taken as the optimization objective, and a matching optimization on hydraulic components was proposed in this research. The optimization process was divided into two stages. The first stage focused on improving the configuration of the vane diffuser. In the second stage, the Plackett-Burman test design was used to screen out the optimization design variables of the vane diffuser and the volute, the optimal Latin hypercube sampling method was adopted to generate 106 sample cases, and an automatic numerical simulation optimization platform was built. Then, different approximate models were employed to construct the relationship between the optimization design variables and the objective function, and their fitting accuracy and robustness were compared. Finally, the optimal design parameters were determined by particle swarm optimization, and entropy production theory was used to analyze the internal flow pattern of the model before and after optimization. Results showed that D 3 , b 4 , β 3 , and S 8 have the greatest impact on the hydraulic efficiency of the pump. The multilayer backpropagation neural network has a higher fitting accuracy and better robustness compared with the other three approximate models. The efficiency of the optimized model under the design condition is increased by 4.22 %, reaching 90.82 %. Reducing the number of layers and vanes of the diffuser and improving the matching of hydraulic components can dramatically improve the hydraulic performance and hump characteristics of large vertical centrifugal pumps. Entropy production theory is a reliable approach to visualizing flow loss. The turbulent flow dissipation in the vane diffuser can be reduced the most after optimization.

Brewing Rutin-Enriched Lager Beer with Buckwheat Malt as Adjuncts

( Yang Deng ),( Juho Lim ),( Gang-hee Lee ),( Thi Thanh Hanh Nguyen ),( Yang Xiao ),( Meizi Piao ),( Doman Kim ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.6

Brewing with buckwheat as an ingredient has been proven to be successful in several previous studies. However, few studies have focused on the effects of buckwheat on the rutin content and antioxidant activity of beer. In order to develop a lager beer with high rutin content and desirable sensory characteristics, tartary buckwheat malt was used as a brewing adjunct. The results showed that the rutin-degrading enzyme was the key factor affecting the rutin content in the wort and beer. Compared to beer made using the common mashing method, the rutin content in the buckwheat beers produced using an improved mashing method was approximately 60 times higher. The total flavonoid contents in buckwheat beers also depended strongly on the mashing methods, ranging from 530.75 to 1,704.68 mg QE/l. The rutin-rich beers also showed better oxidative stability during forced-aging. Meanwhile, the buckwheat beers were found to be acceptable in terms of the main quality attributes, flavor, and taste.