소양호에서의 질화작용

이옥재,강은숙,곽노태,안태영 ( Ok Jae Rhee,Eun Sook Kang,No Tae Kwag,Tae Young Ahn ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.1

The nitrification rate and environmental factors were estimated 10 times from August 1992 to October 1993 in Lake Soyang. 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, 11MPNml^-1) and that of nitrite-oxidizing bacteria was 0.5-92MPNml^-1(mean, 9MPNml^-1). The range of nitrification was estimated 0.01-2.25㎍-Nl^-1day^-1(mean,0.28㎍-Nl^-1day^-1). It was shown through multiple regression analysis from all data that the major factor affecting to nitrification rate was water temperature and the minor factor was pH. The distribution of nitrification rate and ammonia-oxidizing bacteria were not correlated.

대청호에서의 질화작용

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)

수질관리 : 지표수에서 노로바이러스 검출을 위한 유전학적 접근

이옥재 ( Ok Jae Rhee ),이기선 ( Ki Seon Lee ),이목영 ( Mok Young Lee ),한선희 ( Sun Hee Han ) 한국물환경학회 ( 구 한국수질보전학회 ) 2009 공동 추계학술발표회 Vol.2009 No.-

존재론적 장소개념에 의한 전통공간 해석에 관한 연구

이옥재(Lee, Ok-Jae),김문덕(Kim, Moon-Duck) 한국실내디자인학회 2014 한국실내디자인학회논문집 Vol.23 No.4

Nowadays when the social and cultural paradigm is changing, the incomplete space is becoming a matter of controversy. In order to figure out the solutions to it, are being held a variety of spatial discourses for spatial essence and meaning to be cleared. Accordingly, this study has tried to seek for any probability to interpret the ontology shown at any traditional space on the ground of Heidegger`s Ontological Thinking Structure which has a considerable impact on Modern Space, whose conclusions are the followings. First, Heidegger`s ontological space theory, which provided a foundation of Placeness concept, includes not only the character of interdisciplinary learning among philosophy, arts and any related studies but also that of mutual oriental and occidental cultures. Second, between the thoughts of Heidegger and Lao-tzu are considerable similarities from the methodical viewpoint that materializes the meaning of existence as an essence. Third, for a convenient interpretation, the ontological spatial concept of Lao-tzu`s philosophy shown at traditional spaces have been categorized into Typology-Incident, Morphology-situation and Topology-meaning generation with Schultz`s Existential Spatial Concept based on Heidegger`s Ontology as a medium. In particular, the meaning generation which materializes the placeness has the trait of being clarified as the product of interactions between incidents and situations.

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)

위장관 위선암의 림프절 전이의 평가에 있어서 면역조직화학적 방법의 의의

이옥재(Ok Jae Lee),정기문(Kee Moon Chung),하우송(Woo Song Ha) 대한소화기학회 2001 대한소화기학회지 Vol.37 No.5

Background/Aims: Lymph node micrometastasis could be detected by immunohistochemical staining but not by conventional H&E staining. We investigated the usefulness of immunohistochemical staining in evaluation of lymph node metastasis, and examined the role of p53 protein expression in the detection of lymph node micrometastasis. Methods: H&E staining and immunohistochemical staining using antibodies against cytokeratin and CEA were performed in 509 lymph nodes resected from 19 patients with gastric adenocarcinomas. The expression of p53 was investigated for primary tumors and 401 lymph nodes obtained from 16 patients with gastic cancer. Results: Metastasis was confirmed in 131/509 (25.7%) lymph nodes by H&E staining, in 186/509 (36.5%) by immunohistochemical staining (cytokeratin, 186; CEA, 30), and in 187/509 (36.7%) by combined analysis. Micrometastasis was identified in 56 lymph nodes (14.8%). Five of seven patients who had H&E-negative lymph nodes showed micrometastasis, and all were poorly differentiated or signet ring cell type and diffuse type of carcinoma. P53 protein was more frequently expressed in metastasis-positive nodes than negative nodes (24.3% vs. 1.2%, p<0.005). However, the expression of p53 was observed in only 7.0% of lymph nodes with micrometastasis. Conclusions: Immunohistochemical staining for cytokeratin is useful for detection of lymph node micrometastasis, especially in poorly differentiated and diffuse type adenocarcinomas. P53 expression in lymph nodes is not so useful for identification of lymph node micrometastasis. (Korean J Gastroenterol 2001;37:327-335)

간의 원발성 혈관육종

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)

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.