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ARMA-PL : Tacking Nested Periods and Linear Trend Time Series Data
서정열,이세재,오현승,구자활,임택,조진형,Suh, Jung-Yul,Lee, Sae-Jae,Oh, Hyun-Seung,Koo, Ja-Hwal,Lim, Taek,Cho, Jin-Hyung Society of Korea Industrial and System Engineering 2010 한국산업경영시스템학회지 Vol.33 No.2
시계열데이터는 ARMA 분석에 적합지 않은 요소를 내재하고 있는 경우가 있다. 특히 선형성과 주기성을 가진 요소가 확률적인 분포와 자주 혼재되어 있다. 이 논문에서는 이런 선형적 주기적 요소를 찾아내고 분석하는 방법을 제시한다. 특히 주기적 요소는 여러 주기가 층층이 겹쳐져서 나타난다. 주기 간에는 서로 일정 정수비율을 유지하며, 한 주거 안에 다른 주기가 내포되어 있는 경우(nested periods)가 많다. 시간규모(time-scale)개념을 도입하여 이러한 주기적 요소를 개념적으로 정립하고자 했다. 선형적 요소와 주기적 요소가 제거된 후 추출된 데이터는 MA-approximation이라는 방법을 사용하여 가장 데이터에 근접한 ARMA 모텔을 찾아낸다. 마지막으로 선형적 주기적 요소와 ARMA 추정결과를 종합하여 control boundary를 결정하는 방법을 제시한다.
진행성 병기의 소세포폐암에 대한 Etoposide , Cisplatin 복합화학요법치료의 효과
서정열(Jung Yul Suh),정현식(Hyun Sik Jeong),이승세(Seung Sei Lee) 대한내과학회 2001 대한내과학회지 Vol.61 No.6
Background : Small cell lung cancer (SCLC) disseminates early and has poor prognosis. However, SCLC is highly chemosensitive, thus chemotherapy has been established as the primary mode of treatment. This study evaluated the efficacy and toxicity of etoposide in combination with cisplatin in the treatment of extensive stage small cell lung cancer. Methods : Thirty four patients (28 males, 6 females) with previously untreated extensive stage small cell lung cancer were treated with etoposide at a dose of 100 mg/m2, IV on days 1-3 with cisplatin at 100 mg/m2, IV on day 1. The median age was 63 (range 41∼80). This combination chemotherapy was administered every 3-4 weeks. Response rate, response duration, survival, and toxicity were evaluated.Results : The response rate was 50%. The median survival time was 29 weeks. The median response duration was 17.2 weeks in responders. The toxicity was acceptable. Conclusion : This study illustrated that the combination of etoposide and cisplatin is effective in the treatment of extensive stage small cell lung cancer, and can be administered with acceptable toxicity. Although this study was not designed to be a formal comparative trial, the efficacy and toxicity observed with this regimen were found to be comparable to previous reports.(Korean J Med 61:590-596, 2001)
갑상선기능 이상에 따른 혈중 CRP, apolipoprotein A-1, apolipoprotein B 및 Lp(a)농도의 양상
서정열 ( Jung Yul Suh ),이원영 ( Won Young Lee ),박정식 ( Jeong Sik Park ),김선우 ( Sun Woo Kim ) 대한내과학회 2003 대한내과학회지 Vol.64 No.4
Background : Alterations of lipid profiles are well known in thyroid dysfunction. Hypothyroidism is associated with premature atherosclerosis. This relation has been attributed to increased levels of total cholesterol, low density lipoprotein cholesterol
Control Limits of Time Series Data using Hilbert-Huang Transform: Dealing with Nested Periods
서정열(Jung Yul Suh),이세재(Sae Jae Lee) 한국산업경영시스템학회 2014 한국산업경영시스템학회지 Vol.37 No.4
Real-life time series characteristic data has significant amount of non-stationary components, especially periodic components in nature. Extracting such components has required many ad-hoc techniques with external parameters set by users in a case-by-case manner. In this study, we used Empirical Mode Decomposition Method from Hilbert-Huang Transform to extract them in a systematic manner with least number of ad-hoc parameters set by users. After the periodic components are removed, the remaining time-series data can be analyzed with traditional methods such as ARIMA model. Then we suggest a different way of setting control chart limits for characteristic data with periodic components in addition to ARIMA components.
한국 성인에서 Helicobacter pylori 감염 유병 상태 및 심혈관 질환 위험인자들과의 연관성
이은정 ( Eun Jung Rhee ),성기철 ( Ki Chul Sung ),김범수 ( Bum Soo Kim ),강진호 ( Jin Ho Kang ),이만호 ( Man Ho Lee ),박정로 ( Jung Ro Park ),박승하 ( Seung Ha Park ),서정열 ( Jung Yul Suh ),신헌섭 ( Hun Sub Shin ),이현영 ( Hyun Yo 대한내과학회 2002 대한내과학회지 Vol.63 No.5
Background : Chronic inflammation plays an important role in the pathophysiology of atherosclerosis. Among the many pathogens causing chronic inflammation, Helicobacter pylori is the major pathogen for gastric diseases in Korean people. The purpose of this study is to evaluate the prevalence of Helicobacter pylori infection and its association with cardiovascular risk factors in healthy Korean adults. Methods : In 32,998 healthy subjects, the proportion of seroposive subjects for H. pylori and its association with cardiovascular risk factors were evaluated in participants in health screening program. H. pylori infection status was tested with serum IgG antibody test with ELISA and blood pressure, body mass index, serum lipid profiles, hsCRP were tested. Results : 67% of participants were infected with H. pylori serologic test. Seropositivity was highest in age group of over sixty and male subjects tended to be more infected with H. pylori (p<0.05) except for twenties and fifties. After adjusting for age and sex, H. pylori seropositive group showed higher mean values for triglycerides and lower values for HDL (p<0.05). The mean values of other risk factors showed no significant differences between two groups (p>0.05). In multiple logistic regression models, adjusted by age, sex and other variables, total cholesterol was associated with H. pylori seropositivity (odds ratio 1.004, 95% confidence intervals 1.002.1.006, p<0.001) and HDL was inversely related with H. pylori independently (odds ratio 0.990, 95% confidence intervals 0.987.0.992, p<0.001). Age and sex was also positively associated with H. pylori (odds ratio for age 1.029, 95% confidence intervals 1.026.1.032, p<0.001, odds ratio for women to men 0.818, 95% confidence intervals 0.750.0.893, p<0.001). Conclusion : The results of this study is that H. pylori infection is prevalent in Korean adults and is independently correlated with cardiovascular risk factors such as total cholesterol and HDL in atherogenic way in healthy subjects. This may support the previous hypothesises that H. pylori might be one of the atherosclerotic pathogens. (Korean J Med 63:469-476, 2002) Key Words : Helicobacter pylori , Risk factors , Atherosclerosis
이은정(Eun Jung Rhee),이규백(Kyu Beck Lee),서정열(Jung Yul Suh),김향(Hyang Kim),박흥재(Heung Jae Park),김영학(Young Hak Kim),권칠훈(Chil Hun Kwon),이영래(Young Rae Lee) 대한신장학회 2001 Kidney Research and Clinical Practice Vol.20 No.4
A case of a 37 year-old man of congenital diabetes insipidus is reported. He complained of polydipsia, which began from his youth, drinking about 10 L of water every day. He didn't look ill or mentally retarded. In his family, his only brother has shown similar symptoms and his older sister had no symptom. On radiologic study, both kidneys showed severe hydronephrosis and the bladder was markedly distended. Water deprivation test was performed. The result was consistent with diabetes insipidus and the urine osmolality didn't respond to antidiuretic hormone injection, and he was diagnosed as nephrogenic diabetes insipidus. We began to treat him with thiazide and amiloride. The amount of water he's been drinking daily has decreased to 3-4 L per day. We discuss this case with a brief review of literature.
박인옥(In Ok Park),서정열(Jung Yul Suh),정수석(Su Suk Chung),임성호(Seong Ho Lim),이은정(Eun Jung Rhee),윤중원(Jung Won Youn),이호철(Ho Chul Lee),박승하(Seung Ha Park),김정욱(Jeong Wook Kim),조용균(Yong Kyun Cho),이준행(Jun Haeng Lee 대한소화기기능성질환·운동학회 2002 Journal of Neurogastroenterology and Motility (JNM Vol.8 No.1
Achalasia can be provoked by organic causes, and it is called secondary achalasia. Sometimes it is very difficult to distingush secondary achalasia from primary achalasia. We report a case of secondary achalasia due to recurrence of stomach cancer. A 45-year-old man came to our hospital due to three months history of dysphagia and regurgitation. Barium esophagogram showed concentric narrowing at the distal esophagus and dilatation of proximal esophagus. The esophagogastroduodenoscopy showed stenosis of gastroesophageal junction and the endoscope could not pass through it, but there was no evidence of malignancy. Esophageal manometry showed aperistalsis, compatible with achalasia. Abdominal CT showed soft tissue density near the gastroesophageal junction. However it was not possible to differentiate whether it was due to adhesion or malignancy. For correct diagnosis and treatment, explorolaparotomy was performed and it was diagnosed as secondary achalasia due to recurrence of stomach cancer.(Korean Journal of Gastrointestinal Motility 2002;8:53-57)
국부 통계조사자료를 이용한 자산별 경제적 감가상각추정에 대한 연구
조진형(Jin-Hyung Cho),오현승(Hyun-Seung Oh),이세재(Sae-Jae Lee),서정열(Jung-yul Suh) 한국산업경영시스템학회 2007 한국산업경영시스템학회지 Vol.30 No.4
The purpose of computing economic depreciation value is to find valuation of assets closely in line with market prices. The valuation of industrial assets are called Engineering Valuation. The two representative techniques for such valuation are Hulten-Wykoff Method, which estimates real value using regression equations, and T-factor Method devised at Iowa State University. The two are all empirical methods for computing service life (duration period).<BR> In this paper, we derived the service life by empirical methods using national wealth statistics, and also by more conventional methods such as original group method and retirement method. The results from each method are compared with one another. We also computed economic service life from these results. In S. Korea where amount of asset value statistics is still insufficient, the most effective method for empirically computing economic service life turns out to be the one using national wealth statistics. In addition, we also present economic relationship between depreciation value computed by using Hulten-Wykoff Method and depreciation value computed by using T-factor Method.
용해로 운전에서 Setting고정(4M 표준화)의 효율적 방안
조진형(Jin-Hyung Cho),장도수(Do-Soo Jang),이세재(Sae-Jae Lee),서정열(Jung-Yul Suh),김이남(I-Nam Kim),정종원(Chong-Won Chung) 한국산업경영시스템학회 2007 한국산업경영시스템학회지 Vol.30 No.1
Glass melting process is influenced by both control and observation factors, where control factors include quantity and mixing ratio of raw material, the amount of fuel and air in-take. Further observation factors include temperature and pressure at each step of process inside glass melting furnace.<BR> Ambient Control is an effective means to eliminate complications from excessive variation among raw materials, or external disturbance from wide fluctuation of environment around equipments. Ambient Control uses both control and observation factors mentioned above.<BR> This study suggests an effective Proactive Control System that can enable genuine 4M standardization in glass melting furnace by applying Ambient Control.