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이옥재,이일규,박희진,안태영 ( Ok Jae Rhee,Il Gyu Lee,Hee Jin Park,Tae Young Ahn ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.1
The nitrification rate and environmental factors were estimated 12 times at 4 stations from March 1992 to January 1994 in Daechung reservoir. The number of nitrifying bacteria and nitrification rate were measured with MPN and ^14C-dark incorporation method, respectively. The distribution of ammonia-oxidizing bacteria was 0.5∼220MPNml^-1(mean, 13MPNml^-1) and that of nitrite-oxidizing bacteria was ND-42MPNml^-1(mean,3MPNml^-1). The range of nitrification rate was 0.01∼7.15㎍-Nl^-1day^-1(mean, 0.74㎍-Nl^-1day^-1) and the highest value was 7.15㎍-Nl^-1day^-1 at station 3 where lots of fishfarm were located. Being showed through multiple regression analysis from all data estimated, the distribution of nitrification was affected by change of ammonia concentration, but not affected by nitrifying bacterial population.
ATM 멀티캐스트 스위치에서 복사 네트워크의 셀 분배 알고리즘
이옥재,전병실,Lee, Ok-Jae,Chon, Byoung-Sil 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.8
본 논문에서는 복사 네트워크의 멀티캐스트 셀을 적절하게 분배할 수 있는 새로운 분배 알고리즘을 제안한다. 합산기, 분배기, 가상 주소 부호기, 방송 네트워크가 이원적으로 구성된 복사 네트워크는 제안된 분배 알고리즘에 의하여 낮은 번지와 높은 번지가 양분되어 동시에 동작하기 때문에 입력된 셀이 균등하게 처리되어 셀 지연율과 입력 공정성이 개선되고 복잡도가 감소된다. 또한 방송 네트워크로 이진 트리와 Banyan 네트워크로 구성된 확장 Banyan 네트워크를 사용하여 오버플로우 발생 확률을 1/2로 감소 시킨다. 분석 결과 제안된 알고리즘은 입력 버퍼에서 셀 지연율이 확연하게 감소됨을 알 수 있었다. In this paper, a new algorithm is proposed which distributes multicast cells in a copy network. The dual copy network is composed of running adder network, distributor, dummy address encoder, and broadcasting network. It is operated lower input address and higher one simultaneously by the distribution algorithm. As a result, for each input has a better equal opportunity of processing, cell delay and hardware complexity are reduced in copy network. Also, for it adopts the broadcasting network from an expansion Banyan network with binary tree and Banyan network, overflow probability is reduced to a half in that network. As a result of computer simulation, the copy network processed by the distribution algorithm is remarkably improved in cell delay of input buffer according to all input loads.
췌장 가성낭종의 치료 - D`Egidio 및 Schein분류에 따른 치료
이옥재(Ok Jae Lee),김영채(Young Chai Kim) 대한소화기학회 1996 대한소화기학회지 Vol.28 No.5
N/A Background/Aims: The classical approach to acute pseudocyst was to wait for 4-6 weeks before operation, in order to allow spontaneous resolution or maturation of the pseudocyst wall. However, with the recent use of less invasive techniques, this expectant policy may not be nesessary. The aim of this study is to evaluate the usefulness of Degidio and Schein classification of pancreatic pseudocyst as guideline for management. Methods: We classified 38 patients with pancreatic pseudocysts as type I, II and III according to Degidio and Schein classification, and analysed outcornes of treatment in relation to the types of pseudocysts. Results: Early percutaneous r.atheter drainage(PCD) was tried in 17 patients with acute pseudocysts and the success rate was 82.4%. In 23 patients with type I pseudocysts, PCD, operation and conservative treatment were tried in 14, 4 and 5 cases, respectively. Tbe resolution rate of PCD was 85.7%(12/14), the complication rate 28.6%(4/14) and the recurrence rate 16.7%(2/12). The complication and recurrence after operation were observed in 1 and 1 cases, respectively. In 9 patients with type II pseudocysts, PCD was tried in 5 cases with the resolution rate 60%(3 cases), complication rate 60% and recurrence of 1 cases. Operation was successful in all 3 cases without complication and recurrence. In 6 patients with type llI pseudocysts, PCD was not effective in all 2 cases and operation was successful in all 2 cases without complication and recurrence. Conclusions: Early PCD may be useful in acute pseudocysts although pseudocyst wall is immature. Degidio K Schein classification may provide useful guideline for management of pseudocysts. Type l pseudocysts can be adequately managed by PCD alone. In type 11 pseudocysts, surgery is adequate and PCD can be applied depending on presence of cyst-duct communication. Type III pseudocysts should be managed surgically due to ductal pathology. (Korean J Gastroenterol 1996; 28:714 - 720)
이옥재(Ok Jae Lee),심정우(Jung Woo Shim),김현진(Hyun Jeen Kim),김기홍(Kee Hong Kim),정기문(Kee Moon Chung) 대한소화기학회 1997 대한소화기학회지 Vol.30 No.2
Although primary angiosarcoma of the liver is a rare malignant tumor, it is the object of interest because of an association with specific carcinogen such as thorium dioxide, arsenic and vinyl chloride. We present here a case of primary angiosarcoma of the liver found in farmer. A 72-years old man was presented with right upper quadrant abdominal pain. Abdominal ultrasonography and CT scan revealed a mass in the left lobe of the liver and histologic diagnosis of angiosarcoma was made by percutaneous needle biopsy. Follow-up ultrasonography performeci at 8 weeks after discharge against advice increased size of the tumor. (Korean J Gastroenterol 1997; 30: 262-267)
간세포암의 진단에 있어서 요중 Neopterin측정의 유용성에 관한 연구
이옥재(Ok Jae Lee),김영채(Young Chai Kim),하우송(Woo Song Ha) 대한소화기학회 1996 대한소화기학회지 Vol.28 No.4
N/A Background/Aim: Increased urinary neopterin levels have been observed in patients with various liver diseases including hepatocellular carcinoma. The aim of this study is to evaluate the usefulness of the determination of urinary neopterin in patients with hepatocellular carcinoma. Methods: Urinary neopterin were determined by high-performance liquid chromatography(HPLC) in 18 patients with hepatocellular carcinoma, 20 patients with liver cirrhosis and 8 norrnal controls. Results: Urinary neopterin levels were significantly higher in patients with liver cirrhosis(298.49+ 147.16 pmol/mol creatinine, pC0.01) and hepatocellular carcinoma(1248.83+999.'73 pmol/mol creatinine, p <0.01) than normal control(151.29 66.09 pmol/mol creatinine), in patients with hepatocellular carcinoma than liver cirrhosis(p0.05). The sensitivity and specificity of urinary neopterin in the diagnosis of hepatocellular carcinoma were 94.4%, 65% at 3& pmol/mol creatinine, 83.3%, 90% at 500 pmol/mol creatinine, 83.3%, 100% at 700 gno1/mol creatinine, and 55.6%, 100% at 1,000 pmol/mol creatinine, respectively. Significant correlation between urinary neopterin levels and tumor size was observed in the patients with hepatocellula carcinoma (r=0.8395, p CO.OS). Conclusions: Urinary neopterin is useful, specific marker for the diagnosis of hepatcellular carcinoma and reflects tumor burden. (Korean J Gastroenterol 1996; 28:530 - 536)
성인에서 유전자 재조합 B형 간염 바이러스 백신(HG-II)의 면역원성 및 안전성: 0-1-2개월 접종
이옥재(Ok Jae Lee),박선미(Sun Mee Park),이정일(Joung Il Lee),동석호(Seok Ho Dong),조성원(Sung Won Cho),김영수(Young Soo Kim) 대한내과학회 2000 대한내과학회지 Vol.58 No.1
N/A Background : Green Cross HG-II vaccine is recombinant hepatitis B vaccine derived from yeast Hansenula polymorpha. Its immunogenicity and safety using 0-1-6 months vaccination schedule were proven. This prospective study is conducted to evaluate immunogenicity and safety of HG-II according to 0-1-2 months schedule. Methods : 20 g of HG-II vaccine was given intramuscularly at 0, 1, and 2 months to 118 healthy adults seronegative for hepatitis B markers. Sera were assessed for anti-HBs by radioimmunoassay at 1 months and 7-10 months after completion of vaccination. Results : 113 of 118 (95.8%) completed vaccination schedules. The seroconversion rate at 1 month after completion of vaccination was 93.8% (106/113) and protective titers of anti-HBs developed in 82.3% (93/113). The geometric mean titer (GMT) of anti-HBs was 64.91 mIU/ml in all seroconverted vaccinee. There was no incapacitating serious side effect associated with vaccinations. The seropositive rate at 7-10 months after vaccination was 95.3% (81/85) with protective rate of 84.7% (72/85). The anti-HBs titers were decreased in 51.8% (44/85) of vaccinee. The GMT was 80.04 mIU/ml. The protective rate and GMT were 98.0%, 129.43 mIU/ml in the group with anti-HBs titer ≥50 mIU/ml at 1 month after vaccination, and 64.71%, 19.62 mIU/ml in the group with anti-HBs <50 mIU/ml. Conclusion : Green Cross HG-II vaccine is safe and effective in protecting hepatitis B at 0-1-2 months vaccination schedule. However, the booster injection should be recommended for maintenance of immunogenicity, especially in the vaccinee with anti-HBs titer less than 50 mIU/ml at 1 month after vaccination.(Korean J Med 58:12-18, 2000)
RFID를 이용한 MES에서 웹 기반 통합 관리 시스템 설계
이옥재(Ok-Jae Lee) 한국통신학회 2009 韓國通信學會論文誌 Vol.34 No.6D
RFID 시스템은 전자 태그를 이용한 식별기술로서 서비스 연동이 가능하기 때문에 다양하게 연구가 진행되고 있다. 특히 RFID 시스템은 다량의 물품을 실시간으로 식별 가능하기 때문에 유통 물류 분야에서 많이 적용되고 있지만, MES(Manufacturing Execution Systems) 분야에서 적용은 미비하다. 본 논문에서는 RFID 시스템을 이용한 반도체 패키지 소자 제조공정의 자동 공정 관리 시스템 설계를 토대로 발주와 수주를 통합으로 관리할 수 있는 웹기반의 통합관리 시스템을 설계하였다. 이를 위하여 통합관리 시스템의 기본 시트를 정의하였고, 관련 기업간 통합관리를 위한 애플리케이션을 설계하였다. RFID system, as one identification technology with using electronic tag, has been studied in the various fields for being closely connected with services. Especially, it has been applied to the field of supply chain management for identifying a lot of objects by real time, but very rarely to field of MES. In this paper, based on an automatic management system in manufacturing process of semiconductor package elements by using RFID, integrated management system was designed for unifying the management of ordering and receiving an order. For this, the basic sheet of integrated management system was defined, and the application was designed for unifying the management of business between enterprises.