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신경회로망 제어기를 이용한 PID 파라미터 추정에 관한 연구
權重東,裵銀敬,金恩基,全基英,李承桓,吳鳳煥,李勳九,金容珠,韓慶熙 明知大學校 産業技術硏究所 2006 産業技術硏究所論文集 Vol.25 No.-
In this paper, supposed to solve these problem to PID parameters controller algorithm using ANN. In the proposed algorithm, the parameters of the controller were adjusted to reduce by on-line system the error of the speed of IM. In this process, EBPA NN was constituted to an output error value of an IM and conspired an input and output. The performance of the self-tuning controller is compared with that of the PH) controller tuned by conventional method (Ziehler-Nichols). The effectiveness of the proposed control method is verified thought the Matlab Simulink and experimental results.
이종달,배건환,권기욱,이영욱 영남대학교 공업기술연구소 2001 工業技術硏究所論文集 Vol.29 No.1
So as to develop an automatic driving model for ITS, 4 driving courses have been set up to examine the reasonable driving pattern of experienced drivers who are using GPS driving data. The Sugeno-type fuzzy model was constructed by inputting the actually measured driving data, and its suitability was examined.
권기환(Kee Hwan Kwon),이상혁(Sang Hyuk Lee),진성민(Sung Min Jin),이용배(Yong Bae Lee) 대한두경부종양학회 2000 대한두경부 종양학회지 Vol.16 No.1
Lipoma is a benign neoplasm composed of mature fat cells and usually circumscribed by a fibrous capsule. The fat cells are arranged in irregular lobules, partitioned by fibrous septa with supportive vascular channels. Lipoma of the oral cavity is uncommon, and has been reported to be infrequent in the literature in the world so far. An oral lipoma mainly occurs in the cheek and tongue. Surgical excision is the only treatment recommended, and prognosis is uniformly excellent. Recently we experienced two cases of lipoma of the oral cavity and removed the tumor completely by surgical excision.
박기환(Kee Hwan Park),정무권(Moo Kwon Jung),김세권(Sae Kwon Kim) 한국경영학회 2008 經營學硏究 Vol.37 No.6
We value design and development (D & D) projects by applying option analysis and draw some important implications for the D & D strategies of the mobile phone producers in Korea. Assuming that the value follows a mixed jump-diffusion process, we show that the uncertainties associated with the D & D project and the development cost are the two key variables to the valuation. In a market where the future outcomes are more unpredictable, our model implies that an aggressive strategy returns more because it keeps more options (i.e., models in the development process) in the pipeline against the future uncertain states of the world.
Yang, Ji-Hwan,Jung, Hyung-Hwan,Seo, Jihoon,Kim, Kwang-Dae,Kim, Dong-Ho,Lim, Dong-Chan,Park, Sung-Gyu,Kang, Jae-Wook,Song, Myungkwan,Choi, Min-Seung,Kwon, Jung-Dae,Nam, Kee-Seok,Jeong, Yongsoo,Kwon, Se American Chemical Society 2013 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.117 No.45
<P>Toxic doping gases are usually used to produce hydrogenated amorphous silicon (a-Si:H) layers in thin-film solar cells (TFSCs). Hence, an alternative structure that avoids the use of toxic gases is desirable. In this work, we replaced both the <I>p</I>-type-a-Si:H and <I>n</I>-type-a-Si:H layers simultaneously in a normal TFSC to form a structure that is dopant-free. Molybdenum oxide (MoO<SUB>3</SUB>) and lithium fluoride were used as the <I>p</I>-type and <I>n</I>-type layers, respectively. The effects of the deposition method and the thickness of the MoO<SUB>3</SUB> layer on the device performance were investigated. The power-conversion efficiency of the optimized hybrid solar cell reached a maximum of 7.08%, which is remarkable considering the novel structure of the dopant-free devices. The light stability of the devices with and without MoO<SUB>3</SUB> was also compared: the light stability of the device with MoO<SUB>3</SUB> was found to be much better than that of the device without MoO<SUB>3</SUB> and with <I>p-i-n</I> Si layers. This was ascribed to the insignificant number of defect sites generated by the nondoping elements, which led to a less contaminated, more compact, and smoother oxide surface, resulting in an increase in the electron lifetime and improved light stability. This work opens up a new direction toward the development of a truly dopant-free device that does not involve the use of toxic gases during fabrication and provides the potential for further enhancement of the efficiency of future dopant-free solar cells.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-45/jp4031656/production/images/medium/jp-2013-031656_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp4031656'>ACS Electronic Supporting Info</A></P>
Ra Ri Cha,Jeong Hwan Kim,Hoon Sup Koo,Kee Wook Jung,Yang Won Min,Chang Hwan Choi,Han Seung Ryu,Yong Hwan Kwon,Dae Hyeon Cho,Joong Goo Kwon,Kyung Sik Park,Hyun Jin Kim 대한소화기 기능성질환∙운동학회 2022 Journal of Neurogastroenterology and Motility (JNM Vol.28 No.2
Background/AimsNon-celiac gluten sensitivity is characterized by intestinal and extra intestinal symptoms associated with the consumption of gluten-containing food. Since biomarkers for non-celiac gluten sensitivity are lacking, its prevalence is estimated based on self-reported symptoms. However, no data exist on self-reported non-celiac gluten sensitivity in the Korean population. Thus, we aim to investigate the prevalence of self-reported non-celiac gluten sensitivity in the Korean population and to determine its demographic and clinical characteristics. MethodsThis study surveyed Korean participants aged 18-80 years who visited gastroenterology outpatient clinics at 9 tertiary hospitals in South Korea from January 2016 to February 2017. They were questioned regarding symptoms related to gluten ingestion: degree of discomfort (visual analog scale score), frequency, time of symptom onset, and duration. Abdominal discomfort caused by 11 different kinds of gluten-containing Korean food items was investigated. ResultsMore non-celiac gluten sensitivity self-reporters were identified among those with irritable bowel syndrome (33.6%) than among controls (5.8%). Major gastrointestinal symptoms included bloating (75.0%), abdominal discomfort (71.3%), and belching (45.0%). Common extra-intestinal symptoms included fatigue (20.0%) and headache (13.7%). More than half of those who self-reported non-celiac gluten sensitivity (66.3%) developed symptoms within 1 hour of food ingestion, and symptoms were localized in the upper abdomen (37.5%) and entire abdomen (30.0%). ConclusionOur findings suggest that if there are gluten-related symptoms in irritable bowel syndrome, the possibility of accompanying non-celiac gluten sensitivity should be considered.