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박사준(Sa-Joon Park),이상훈(Sang-Hoon Lee),고삼일(Sam-Il Ko),김기태(Ki-Tae Kim) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.2Ⅱ
본 논문에서는 역전파 신경망(Backpropagation Neural Network)을 시계열 데이터인 주가 데이터를 이용한 주가 예측의 정확도를 향상시키기 위한 학습 방법으로 적용 하였다. 실제 증권거래소의 종목 데이터에서 비교적 등락폭이 안정적인 각 산업분야별 5개의 기업의 5일 이동평균선 데이터 240개를 훈련 데이터로, 20개는 테스트 데이터로 이용하였다. 선정된 입력 데이터를 은닉층의 개수의 은닉 노드의 개수 등을 달리 하면서 10,000번의 훈련을 통해서 실험 하였으며, 그 결과 1개의 은닉층을 사용한 네트워크 1은 20개의 테스트 데이터 사이의 19개의 신호 중 14개를 예측하였고, 2개의 은닉층을 사용한 네트워크 2는 16개를 예측하였다. 시험 결과를 통해서 본 듯이 은닉층을 2개 사용하였을 때 보다 좋은 실험 결과를 얻을 수 있었으며, 역전파 신경망 모델이 주가 예측에 적합하다는 것이 증명되었다.
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태아 긴박증에서 태아 심장박동의 비선형 동력학 및 카오스 분석
김사진(Sa Jin Kim),신종철(Jong Chul Shin),정대영(Dae Young Chung),심영보(Young Bo Sim),이상훈(Sang Hoon Yi),김창이(Chang Yi Kim),김수평(Soo Pyung Kim) 대한산부인과학회 2000 Obstetrics & Gynecology Science Vol.43 No.6
Objectives: For estimating the antenatal fetal wellbeing to develop new analysis method of fetal heart rate(FHR) with electronic Fetal Heart Rate Monitoring(eFHRM) and computer.Methods: Heart rate signal is received from distressed fetus using eFHRM. It is necessary to carry out low pass filtering as a preprocess for the nonlinear method. Nonlinear parameters are calculated and classified to investigate the relations between these parameters and values of umbilical cord blood gas.Results: By dividing values of the umbilical cord blood gas into 5 fetuses of acidemic group and 17 fetuses of non-acidemic group after 22 neonates who presented fetal distress were born, the following results as compared with nonlinear chaotic analysis result were obtained. 1. Delay time through AMI for acidemic group was 16.80±3.11, and was higher than 15.41±2.27 for non-acidemic group, and is not significant in statistics.2. Embedding Dimension calculated with FNN method was 5.60±2.07 for acidemic group, and 4.71±1.26 for non-acidemic group, and it was not significant statistically.3. Correlation dimension for acidemic group was 1.41±0.20, and was higher than 1.10±0.38 for non-acidemic group, and is not significant in statistics.4. Mean crossing value by isoangular return map was 28.80±11.34 for acidemic group, and 16.65±7.00 for non-acidemic group, and it was significant statistically(P=0.008).5. In comparison of information entropy in 1-D ED, acidemic group was 6.32±0.38 and non-acidemic group was 6.20±0.28 and it was not significant statistically. Also, in comparison of value in 2-D ED, acidemic group was 10.20±0.34. It was higher than non-acidemic group of 9.51±0.43 significantly in statistics(P=0.004). But, in comparison of value in 2-D EP, acidemic group was 8.78±0.86 and non-acidemic group is of 9.22±0.74 and it wasn't significant statistically. And, 2-D ED(DI) value was 10.64±0.14 for acidemic group and 10.51±0.18 for non-acidemic group, and it wasn't significant statistically.Conclusions: By the above result, nonlinear dynamics and chaotic analysis of heart rate data with computer can serve as a new diagnosis method which may estimate the fetal wellbeing with real time. Through further studies for establishment of diagnosis standard and computer programming, real time diagnosis method shall be applied to clinical practice.
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최기준(Gi Jun Choi),임영철(Young Chul Lim),김기용(Ki-Yong Kim),성병렬(Byung Ryul Seong),김맹중(Meing Jooung Kim),김원호(Won Ho Kim),지희정(Hee Chung Ji),이종경(Joung Kyong Lee),전병수(Byoung Soo Jeon),정민웅(Min Woong Jung),이상훈(Sa 한국초지조사료학회 2008 한국초지조사료학회지 Vol.28 No.3
본 시험은 사료용 옥수수 검은줄오갈병 피해 다발지역의 발병실태를 조사하여 종합적인 방제기술 개발에 필요한 기초 자료를 확보하고자, 2006년부터 2007년까지 제주도를 제외한 전국을 대상으로 수행하였다. 검은줄오갈병의 발생은 지역에 따라 차이가 많았으며, 발병이 심한 지역은 경기(이천), 전북(고창, 김제), 전남(영광), 경북(김천, 영주), 충남(천안, 보령)이었다. 옥수수 검은줄오갈병 다발지역에서 파종시기가 4월 26일~5월 15일까지 파종이 발병이 적었으며, 파종기가 4월 10일~20일 또는 5월 31일 이후에서 발병이 많았다. 검은줄오갈병의 발생은 옥수수 품종간의 차이는 다소 있으나 저항성을 나타내는 품종은 없었다. 옥수수 검은줄오갈병 감염에 따른 건물수량은 발병률이 높을수록 유의적으로 감소하였으며, 발병률과 옥수수 건물수량 간에는 고도의 부의상관 (r = -0.86**)이 인정되었다. 검은줄오갈병에 감염된 옥수수는 건전한 옥수수보다 건물소화률은 3.2%, 가소화양분총량은 3.6%, RFV는 12% 낮았으며, NDF와 ADF 함량은 각각 3.7, 4.5% 높아져 전체적으로 사료가치가 낮아지는 것으로 나타났다. This experiment was carried out to investigate the actual outbreak status of rice black-streaked dwarf virus (RBSDV) disease in forage corn for securing the basic data to control of the disease all over the country from 2006 to 2007. Outbreak of the disease showed a wide difference according to regions and was severe in Icheon, Gochang, Kimje, Youngkwang, Kimchun, Youngju, Cheonan, and Boroung provinces in Korea. Outbreak rate of the disease was effected by planting time of forage corn. Disease rate was lower in corns planted from Apr. 26 to May 15 than in those of planted from April 10 to 25 or after May 31. The corn fields planted from April 26 to May 15 showed lower disease rate than that of planted from April 10 to 25 or after May 31. Also the outbreak rate of the disease was some difference according to corn varieties but was not genuinely resistant varieties to RBSDV. Dry matter yield of forage corn was significantly decreased depending on disease rate, and was highly negative correlation to disease rate. The forage corn infected with RBSDV was lower 3.2%, 3.6% and 12% in IVDMD, TDN, and RFV, and higher 3.7% and 4.5% in NDF and ADF than those of the healthy plant, respectively.
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