• The Korean Journal of Applied Statistics
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• 제16권2호
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• pp.293-303
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• 2003

Under the case that we know the period and the reason of external events, we reviewed the method of model identification, parameter estimation and model diagnosis with the former papers that have been studied about the linear time series model with intervention, and compared with nonlinear time series model such as ARCH, GARCH model that it has been used widely in economic models, and also we compared with the combination prediction method that Tong(1990) introduced.

• The Journal of Information Systems
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• 제29권1호
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• pp.241-265
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• 2020

Purpose Various machine learning techniques are used to implement for predicting corporate credit. However, previous research doesn't utilize time series input features and has a limited prediction timing. Furthermore, in the case of corporate bond credit rating forecast, corporate sample is limited because only large companies are selected for corporate bond credit rating. To address limitations of prior research, this study attempts to implement a predictive model with more sample companies, which can adjust the forecasting point at the present time by using the credit score information and corporate information in time series. Design/methodology/approach To implement this forecasting model, this study uses the sample of 2,191 companies with KIS credit scores for 18 years from 2000 to 2017. For improving the performance of the predictive model, various financial and non-financial features are applied as input variables in a time series through a sliding window technique. In addition, this research also tests various machine learning techniques that were traditionally used to increase the validity of analysis results, and the deep learning technique that is being actively researched of late. Findings RNN-based stateful LSTM model shows good performance in credit rating prediction. By extending the forecasting time point, we find how the performance of the predictive model changes over time and evaluate the feature groups in the short and long terms. In comparison with other studies, the results of 5 classification prediction through label reclassification show good performance relatively. In addition, about 90% accuracy is found in the bad credit forecasts.

• Journal of the Korean Ceramic Society
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• 제44권9호
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• pp.502-509
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• 2007

This paper investigated how Fine Fly Ash (FFA) with $14,000\;cm^2/g$ of Fineness affects the micro structure and material properties of High-Performance Concrete (HPC) before and after hardening from Material Test of HPC and Cement Paste. FFA is applied as a substitute of Silica Fume which is used necessarily in producing HPC. As a Material Test results, 5% FFA series specimen shows the lower fluidity than SF series specimen. When, however, the Fluidity of 10% FFA series specimen is increased reversely to the similar value of SF series specimen. The Porosity of FFA series specimen of 3 day age is displayed to $21{\sim}24%$, which is higher than $19{\sim}20%$ porosity of SF series specimen, while that of 28 day age is reached to $8{\sim}9%$, which is improved compared with 10% fo SF series specimen. It can be thought that FFA has better influence on the porosity of HPC in case of long term age. The Compressive strength of FFA series specimen shows the similar result with the property of porosity. The compressive strength of 28 day age FFA series specimen is $98{\sim}106%$ of SF series specimen and 107% of plain specimen to reveal better strength development.

• Research in Mathematical Education
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• 제11권3호
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• pp.177-184
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• 2007

The purpose of this paper is to introduce the development of a new Lesson Video-Case Lab (LVCL) program in Suzhou, China. This program involves the creation of several series of hypermedia video-cases on teaching and learning designed to facilitate mathematics teachers' professional development. Each of these video-cases consists of lesson clips, case questions, interviews with experts, comments by peers, responses by students and other related resources. The study has implications pertaining to the use of technology in teacher development, the production of hypermedia video-cases, as well as research on case-based pedagogy and pedagogy in general.

• Journal of Physiology & Pathology in Korean Medicine
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• 제29권6호
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• pp.523-529
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• 2015

The purpose of this case-series study is to report the effect of Seungmahwangryeontang-gami and facial venesection on Hot flush patients. For this report, two of patients had taken Seungmahwangryeontang-gami for 45 days and the other patient had taken eungmahwangryeontang-gami for 60 days. Also, one of the patients had taken twice facial venesection, and the other two patients had done it three times during the treatment. During this period, we tried to find out that there were objective change and subjective change in reduction of hot flush. We were going to ascertain the subjective change through the change of VAS score. In case of objective change, we used the change of the color which were taken by the Derma Vision. The result of the treatment, each patients' VAS score reduced from 73 to 41, 67 to 44, and 71 to 51. Based on the Derma vision's facial color change, the score of Red and Dark Red, which mean Hot flush, were reduced. On the other hand, that of Blue and Dark Blue were increased. According to the results, we had obtained positive clinic effects from Seungmahwangryeontang-gami and facial venesection on Hot flush patients respectively. Although this report is based on few patients' treatments on hot flush with Seungmahwangryeontang-gami and facial venesection, we can use this result in a good way. However, the limitation of this report is that we can't generalize the following result because of the lack of the cases and we can't present a conclusive evidence which can prove the validity of the Hot flush from the case-series study.

• Korean Journal of Acupuncture
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• 제32권1호
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• pp.1-12
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• 2015

Objectives : The purpose of this study was to review the acupuncture and moxibustion therapy for gastroesophageal reflux disease(GERD) in China. Methods : The literatures were searched using the database-China Academic Journals(CAJ)(~2015.1.). Clinical studies of acupuncture and moxibustion therapy for GERD such as randomized controlled trial(RCT), non-randomized controlled trial(NRCT), case series, or case report were included. Results : Thirty studies met our inclusion criteria: 24 RCTs, 4 NRCTs, 1 case series, 1 case report. Various kinds of treatment such as body acupuncture, abdominal acupuncture, acupuncture therapy with finger on back-shu point, electroacupuncture, acupoint injection, auricular acupuncture, and moxibustion were used in the clinical studies. The treatment groups take herbal medicines at the same time in 16 studies, and proton pump inhibitor(PPI) and histamine 2 receptor antagonist were used as a comparative treatment in the most of studies. Acupuncture or moxibustion treatments were done daily or 2~3 times a week for 5 days~18 weeks. All of studies reported higher effective rate in the acupuncture or moxibustion treatment group compared to the western medication control group. Conclusions : The results of this study could be used for the future practice and the clinical research about the acupuncture and moxibustion therapy for GERD.

• Korean Journal of Acupuncture
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• 제28권4호
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• pp.147-158
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• 2011

Objectives : The purpose of this study was to obtain some knowledge about the acupuncture treatments on Parkinson's disease for the future practice and the research from the clinical studies in China. Methods : The literatures were searched using the data base-China Academic Journals (CAJ) (1994-2011). Clinical studies of acupuncture for Parkinson's disease such as randomized controlled trial (RCT), non-randomized controlled trial (NRCT), case series, case report were included. Results : Of 145 articles, 52 Clinical studies met our inclusion criteria: 20 RCTs, 7 NRCTs, 22 case series and 3 case reports. Various kinds of acupuncture treatments such as scalp acupuncture, body acupuncture, abdominal acupuncture, acupoint injection, eye acupuncture and thick needle acupuncture (粗鍼) were used in the clinical studies. The treatment and control groups take Madopa Tablet (Levodopa + Benserazide HCl) in the same time in many studies, and Madopa treatment was used as a comparative treatment in the most of studies. Acupuncture treatment was done daily or 2~3 times a week for 2~20 weeks. All of studies reported high effective rate in the treatment group compared to control group. Conclusions : The results of this study could be used for the future study about the acupuncture therapy for Parkinson's disease.

• Journal of Acupuncture Research
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• 제30권3호
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• pp.87-99
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• 2013

Objectives : The objective of this study is to find out the method and effects of fire needling on frozen shoulder in China. Methods : We searched journals using the China National Knowledge Infrastructure(CNKI) and PubMed. The keywords were a combination of "fire needling", "fire needle", "burning acupuncture", "frozen shoulder", "adhesive capsulitis", "periarthritis". Results : There were 23 studies finally selected, 7 were case control studies and 16 were case series studies. There were 9 out of 14 main meridians and 31 kinds of acupoints. The most frequently adopted meridians were LI, SI and TE. The most frequently used acupoints were $LI_{15}$, $SI_9$ and $TE_{14}$. Adjacent points were used more often than distant points. They usually heated the needle before insertion and needle retention was mostly not done. 7 case control studies showed that fire needling reported better results than the filiform needle or electro-acupuncture treatment. 15 case series studies reported a significant improvement in fire needling on frozen shoulder patients. Conclusions : There have been many studies regarding fire needling on frozen shoulder in China. Further studies should be required and these can be applied to clinical practices in Korea.

• Geotechnical Engineering
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• 제2권3호
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• pp.5-14
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• 1986

The results of stabilization process in silty.clays and sand-silts, which were, respectively, treated with Calcium hydroxide of the Calcium series and Aluminium Sulphate of the Aluminium series are follows. 1) In the former case used calcium hydrate and calcium cabonate for silty-clays, calcium aluminnium cabonate oxide hydrate and calcium carbonate for sandy-silts were produced 2) In the latter case used Aluminium Sulphate, by X-ray diffraction test, it was found that Aluminium Oxide was produced both in silty-clays and sandy-silts 3) As the results of stabilization process, in the former case, unconfined compression strength was increased greatly but in the latter case it was little increased.

• Journal of Oriental Neuropsychiatry
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• 제22권4호
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• pp.11-20
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• 2011

Objectives : The purpose of this study was to obtain some knowledge about the scalp acupuncture treatment on Parkinson's disease for the future practice and the research from the clinical studies in China. Methods : The literatures were searched using the database-China Academic Journals(CAJ) (2006-2011). Clinical studies of scalp acupuncture for Parkinson's disease-Randomized controlled trial(RCT), case control study, case series, case report- were included. Results : Of 65 articles, 12 Clinical studies met our inclusion criteria. Three case series reported a significant improvement in the patients with Parkinson's disease by scalp acupuncture, and 9 RCTs reported a significant effectiveness of scalp acupuncture as a monotherapy or as a combination therapy with Madopa Tablet(Levodopa + Benserazide HCl) treatment. Conclusions : The results of this study could be used for the future study about scalp acupuncture for Parkinson's disease.