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류재환 ( Jae-hwan Ryu ),권경락 ( Kyung-lag Kwon ),윤여창 ( Yeo-chang Yoon ),손종수 ( Jong-soo Son ),정인정 ( In-jeong Chung ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.1
오늘날 많은 기업들이 RFID 를 이용한 생산관리 시스템을 도입하여 사용하고 있는 가운데 ERP와 같은 기업관리 시스템과 연계한 RFID 시스템도 많이 등장하고 있다. 이러한 연계 시스템은 RFID를 이용하여 ERP 시스템에 실시간성을 부여함으로써 시간적 정보를 얻을 수 있도록 한다. 그러나 공정의 흐름관리 측면에서는 실시간성 뿐만 아니라 복잡한 순서를 가진 공정에 대해 올바른 진행이 가능하도록 유도해주는 기능이 필요하다. 본 논문에서는 ERP 와의 연계를 통한 RFID 기업정보시스템에 상황인지 기술을 접목시켜 전후 공정을 파악함으로써 올바른 공정 진행을 유도하는 시스템을 제안하고 구현한다. 본 논문에서 제안한 시스템은 공정의 공정 오류의 발생을 줄임으로써 작업자의 공정 진행 실수로 인한 손실을 줄였다.
권경락,류재환,손종수,정인정,Kwon, Kyung-Lag,Ryu, Jae-Hwan,Sohn, Jong-Soo,Chung, In-Jeong 한국정보처리학회 2009 정보처리학회논문지D Vol.16 No.4
최근 RFID 기술과 기업정보시스템을 연계하여 사용하려는 많은 시도가 진행되어 왔다. 하지만, 대부분의 경우 동시에 많은 양의 인식할 수 있는 RFID의 기본적인 특징에만 충실했을 뿐, 리더로부터 생성되는 많은 양의 데이터에 대한 관리적인 측면을 고려하지 못하고 있다. 그 결과, 이러한 시스템을 통해 시간이나 흐름과 관련된 연속적이고 동적인 정보를 얻기가 어렵다. 본 논문에서는 대량의 RFID 데이터를 효율적으로 관리하기 위해 RFID 데이터 마이닝 기법의 하나인 경로 트리(PathTree)를 보완한 공정트리(Procedure Tree)라는 새로운 방법을 제안한다. 제안한 방법을 실제 기업 정보 시스템과 연계하여 실시간 공정 관리 시스템에 적용한 후 제안한 시스템의 효율성을 평가한다. 제안한 방법을 통해 기존 RFID 기반 생산관리 시스템이 하기 어려운 실시간 공정 관리를 위한 공정 흐름의 예측이나 추적과 같은 업무를 효과적으로 수행할 수 있었다. In recent years, there have been many attempts to connect the latest RFID (Radio Frequency Identification) technology with EIS (Enterprise Information System) and utilize them. However, in most cases the focus is only on the simultaneous multiple reading capability of the RFID technology neglecting the management of massive data created from the reader. As a result, it is difficult to obtain time-related information such as flow prediction and analysis in process control. In this paper, we suggest a new method called 'procedure tree', an enhanced and complementary version of PathTree which is one of RFID data mining techniques, to manage massive RFID data sets effectively and to perform a real-time process control efficiently. We will evaluate efficiency of the proposed system after applying real-time process management system connected with the RFID-based EIS. Through the suggested method, we are able to perform such tasks as prediction or tracking of process flow for real-time process control and inventory management efficiently which the existing RFID-based production system could not have done.
뇌경색유발(腦梗塞誘發) 흰쥐의 국소뇌혈류량(局所腦血流量)과 뇌부종(腦浮腫)에 대한 이진탕(二陳湯)의 수(水) 및 메탄올추출엑스의 효과(效果)
윤상협,민병일,류재환,Yun, Sang-Hyeop,Min, Byeong-Il,Ryu, Jae-Hwan 대한한의학회 1996 대한한의학회지 Vol.17 No.2
For the purpose of developing a new drug against cerebral infarction, we chose Ijintang which is frequently applied in the field of Jung Pung of traditional medicine. From this formula, water extract and methanol extract were prepared respectively. Animals were divided into three groups; control group, water extract medicated group, methanol extract treated group. water extract was given 195mg/kg orally and methanol extract, 165mg/kg for 2 weeks in case of cerebral edema and 1 month in regional cerebral blood flow. On the regional cerebral blood flow, the drug medicated groups showed no significant changes as compared gith control group. There was no significant difference on the cerebral edema among the groups. According to the results above, it is suggested that oral medication of water extract and methanol extract from Ijintang have no effect on the change of rCBF and edema after acutely induced cerebral infarction. However, it is thought that modification of administration method and development of new animal model for traditional medicine are needed.
한방병원 중증치료실 입원 환자의 임상적 분석 - 주 질환 및 합병증 위주로 -
노현인,이지숙,윤다래,이서라,류재환,Noh, Hyun-In,Lee, Jee-Sook,Yoon, Da-Rae,Yi, Seo-Ra,Ryu, Jae-Hwan 대한한방내과학회 2012 大韓韓方內科學會誌 Vol.33 No.2
Objectives : This study was designed to quantify the characteristics, main diagnosis and complications in the intensive care unit (ICU) at an Oriental Medical Hospital. Methods : The medical records of 44 patients admitted to the ICU at Kyunghee Oriental Medical Hospital between January 1, 2011 and December 31, 2011 were reviewed. Basic characteristics of patients, admission channel, main diagnosis, east-western medical therapy, mortality, and complications were investigated retrospectively based on medical notes. Results : 1. The total number of patients was 44. Males were 63.6%, females 36.3%. Average admission days was 15.9. 2. The most frequent age group is eighties, 38.6%. 3. The most frequent disease is cerebrovascular disease, 61.3%. 4. The medical therapy done after admission to ICU was intubation. Central vein insertion was performed next, followed by Foley's catheter insertion, ventilator, tracheostomy, nasogastric intubation, and thoracentesis in order. The proportion of Oriental medical treatment provided to the patients of ICU was as follows: herbal medication only 6.8%; herbal medication plus acupuncture 31.8%; herbal medication, acupuncture electro-acupuncture, plus subcutaneous acupuncture 2.3%; and none 27.3%. 5. The number of cases of complications occurred since ICU admission was 18. The most frequently observed complication was infection, including 6 cases of pneumonia and 4 cases of urinary tract infection. Conclusions : We suggest that ICUs of Oriental medical hospitals need to be managed effectively to treat diseases including cerebrovascular disease and prevent complications.
식기세척기 건조 효율 향상을 위한 내부 유동 분포 분석에 관한 연구
최용균(Yong-Kyun Choi),류재환(Jae-Hwan Ryu),고한서(Han Seo Ko) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Energy efficiency of a dishwasher has been mostly affected by performance of a dry duct. Thus, air flows in a dry duct, especially depending on its shape, should be investigated to improve the power efficiency when operating the machine. In order to analyze the phenomena experimentally, a PIV (Particle Image Velocimetry) has been used, and then the flow inside the dry duct has been predicted by the CFD (Computational Fluid Dynamics) in this study to determine the appropriate design. The determined shape has been confirmed by the developed flow visualization technique so that the energy efficiency of the dishwasher can be improved.
김용석(Yong-Seok Kim),류재환(Jae-Hwan Ryu),전태하(Tae-Ha Jun),이민기(Min-Kee Yi) 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.35 No.-
This research for replacement of chlorine, phosphorus or sulfur based EP(extreme pressure)-additives which is restricted materials by environmental regulation. as a follow this subject, 4-ball test and friction test were experimented in accordance with temperature and velocity, Compounding with several organic or inorganic metallic elements, After 4-ball test, Wear area of Steel ball was analysed by SEM-EDX, As the analysis, organic and inorganic elements make a effect for extreme pressure lubricity. it is shown that The friction coefficient of lubricant which includes chlorine or sulfur additives. the scoring phenomenon is found at 150℃ and the scuffing phenomenon at 200℃, Applying to Na, P, S, Zn, Ca based inorganic and organic elements, The result showed that friction coefficient is decreased more and more, as increasing temperature of lubricant. The additive is based S, Cl, P elements is effect for extreme pressure in the sample#l and is Na, P, S, Zn, Ca in sample #2 , These elements are environmental contaminants and S, Cl, P based EP additives which are very popular in domestic industry, when they are properly composed with non-chlorine based additives and Na, P, S, Zn, Ca organic or inorganic elements. it is showed that lubricity and excellent anti-wear property.