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RFID시스템에서 슬롯의 혼잡도를 이용한 DFS-ALOHA 알고리즘
이재구,최승식,Lee, Jae-Ku,Choi, Seung-Sik 한국정보처리학회 2009 정보처리학회논문지 C : 정보통신,정보보안 Vol.16 No.2
RFID 리더기가 영역내의 다수의 태그를 인식할 때 태그간의 통신간섭에 의해 태그인식이 방해 받는다. 이를 피하기 위해서는 충돌방지 알고리즘이 필요하게 된다. 충돌방지 알고리즘은 크게 슬롯 알로하 기반 알고리즘과 트리기반 알고리즘으로 나뉜다. 본 논문은 ISO 18000-6 TYPE A에 정의된 알로하 기반의 Framed Slotted ALOHA(FSA) 알고리즘에 태그와 슬롯간의 혼잡도를 이용하여 성능을 개선한 Dynamic Framed Slotted ALOHA-Slot Congestion(DFSA-SC) 알고리즘을 제안한다. 시뮬레이션 결과 최초 태그 수 추정의 정확도를 높여 전체 태그인식 시간이 줄어든 것을 확인 할 수 있었다. 나아가 태그 아이디의 중복성이 클 경우 대표적인 트리기반 알고리즘인 Query Tree 알고리즘보다 제안된 알고리즘이 우수한 것을 확인 할 수 있었다. For the implementation of a RFID system, an anti-collision algorithm is required to identify multiple tags within the range of a RFID Reader. There are two methods of anti-collision algorithms for the identification of multiple tags, conclusive algorithms based on tree and stochastic algorithms based on slotted ALOHA. In this paper, we propose a Dynamic Framed Slotted ALOHA-Slot Congestion(DFSA-SC) Algorithm. The proposed algorithm improves the efficiency of collision resolution. The performance of the proposed DFSA-SC algorithm is showed by simulation. The identification time of the proposed algorithm is shorter than that of the existing DFSA algorithm. Furthermore, when the bit duplication of the tagID is higher, the proposed algorithm is more efficient than Query Tree algorithm.
아세톤집충법(集蟲法)에 의(依)한 전주지방축견(全州地方畜犬)의 견사상충(犬絲狀蟲) 감염률(感染率) 조사(調査)
이재구,Lee, Jae Ku 대한수의학회 1966 大韓獸醫學會誌 Vol.6 No.1
Survey of the infection rate of Dirofilaria immitis in Korean dogs was made in Chunju area by means of Kume's Aectone-Concentrating method. During the period of 60 days(July August) 1cc of the blood was collected from Vena mediana antebrachii of each of 205 dogs over the age of one year regardless of its sex.(In this case 2cc syringe was used.) Time for collecting the blood was from 2 p.m. to 6 p.m. The collected blood was checked, using Kume's acetone-concentrating method.: The results were summarized as followings. Microfilaria was detected in 47 dogs(23%) out of 205. Based on the dog's age, microfilaria possitive rate is 15.5% (12 dogs out of 77) at one age; 24%(14 dogs out of 59) at the age of two; 28%(12 dogs out of 43) at the age of three; 5%(5 dogs out of 15) at the age of four.
비고유숙주(非固有宿主)에 있어서 면역억제(免疫抑制)가 돼지 회충(蛔蟲)의 감염(感染)에 미치는 영향(影響) I. 집토끼에서의 실험소견(實驗所見)
이재구,이창현,박배근,이상복,Rhee, Jae-ku,Lee, Chang-hyun,Park, Bae-keun,Lee, Sang-bork 대한수의학회 1993 大韓獸醫學會誌 Vol.33 No.4
As a series of studies to investigate the effect of immunosuppression on Ascaris suum infection in undefinitive hosts, a delicate relationship between host and parasite, rabbits were divided into experiment 1(control group) and experiment 2(immnunosuppressive group treated with prednisolone acetate) and inoculated with a single dose of 5,000 embryonated A suum eggs. The recovery rates, sizes and morphology of the larvae and immunological responses in the rabbits were chronologically monitored according to somatic migration. In both experiments, the larvae failed to develop into the adults, but young adults in the experiment 2 grew somewhat faster and survied later than those in the experiment 1. The mast cells of small intestinal mucosa and mesenteric lymph nodes and the goblet cells of small intestinal mucosa in the worm detected cases of experiment 2 decreased remarkably in number comparing with those of experiment 1. Considering the experimental results. the expulsion mechanism of somatic migrant larvae may he related to the temporary increasing tendency of the mast cells, the goblet cells, T-cells of mesenteric lymph nodes and spleens, eosinophils in peripheral blood, degranulation rates of peritoneal mast cells and the migration inhibition rates of leucocytes. In addition, patent infection of A suum in the rabbits was not obviously observed despite of immunosuppression by prednisolone acetate.
비고유숙주(非固有宿主)에 있어서 면역억제(免疫抑制)가 돼지회충(蛔蟲)의 감염(感染)에 미치는 영향(影響) II. 햄스터에서의 실험소견(實驗所見)
이재구,김현철,박배근,이창현,Rhee, Jae-ku,Kim, Hyeon-cheol,Park, Bae-keun,Lee, Chang-hyun 대한수의학회 1994 大韓獸醫學會誌 Vol.34 No.1
As a series of studies to investigate the effect of immunosuppression on Ascaris suum infection in undefinitive hosts, a delicate relationship between host and parasite, in the present studies golden hamsters were alloted to experiment 1(normal undefinitive host group) and experiment 2(immunosuppressive group treated with prednisolone acetate) and inoculated with a single dose of 1,500 embryonated Ascaris suum eggs. The recovery rates, sizes and features of the larvae and immunological responses in the hamsters were chronologically monitored according to somatic migration. In both experiments, the larvae failed to develop into the adults, but the more and larger larvae were observed for a longer period from experiment 2 in comparison with experiment 1. The numbers of the mast cells in the small intestinal mucosa and mesenteric lymph nodes, of the goblet cells in the small intestinal mucosa and of T-cells in the mesenteric lymph nodes, spleens and cardiac blood from experiment 2 were fewer than those from the experiment 1. In general, increasing of these cells followed by expulsion of the worms in the both groups. Profound leukopenia due to lymphopenia was found through trial period in experiment 2. Considering the experimental results, development or expulsion mechanism of somatic migrant larvae may be related to lymphopenia and temporary increasing tendency of the mast cells, the goblet cells and T-cells. In addition, patent infection of A suum in the hamsters was not obviously observed in spite of immunosuppression by prednisolone acetate.
사료급여후(飼料給與後) 시간경과(時間經過)에 따른 젖소의 제일위내(弟一胃內) 섬모충류(纖毛蟲類)의 동태(動態)
이재구,이호일,이상복,백병걸,Rhee, Jae Ku,Lee, Ho Il,Lee, Sang Bork,Baek, Byeong Kirl 대한수의학회 1979 大韓獸醫學會誌 Vol.19 No.2
Eight Holstein cows weighing 419-673kg with 2 to 10 years of age were allocated into two groups, four animals each, to study the effect of feeding urea and urea plus Zeolite on rumen pH and the population of rumen ciliates. Rumen fluid samples were taken after morning feed for 7 times at one hour intervals. Experimental results obtained were as follows; 1. Rumen pH was gradually dropped from 7.272 to 7.163 by 3.01 hour and from 7.18 to 7.07 by 2.87 hour and reached 7.352 and 7.29 at 7 hour after feeding, respectively on urea and urea plus Zeolite feeding group. 2. Total ciliate numbers decreased from 209,540 to 113,755 by 4.311 hour and from 381,430 to 203.125 by 4.406 hour and gradually increased to 151,030 and 265,230 by 7 hour after feeding, respectively on urea and urea plus Zeolite feeding group. 3. Population of ruminal ciliates was not changed and Entodinium simplex was the major ciliate population for both treatments. It was from 81.21 to 89.12% on urea feeding group and from 84.6 to 88.3% of total number of ciliates on urea plus Zeolite feeding group.
In Vitro에 의한 제올라이트·요소합제(尿素合劑)의 사료효율(飼料效率) 판정(判定)
이재구,이호일,Rhee, Jae Ku,Lee, Ho Il 대한수의학회 1981 大韓獸醫學會誌 Vol.21 No.2
In order to estimate the efficiency of feed added urea-mixed zeolite the experiment was carried on in vitro. The results obtained were as follows: 1. The pH of all media added urea were inclined toward alkali, except 1% urea (included 99% zeolite) medium. 2. The concentration of ammonia in all media added urea-mixed zeolite was inversely proportional to added volume of zeolite; 1,349, 1,298, 1,255, 1,164 and $786{\mu}g/ml$ in 40%, 20%, 10%, 5% and 1% urea media respectively for 30 minutes incubation, and the concentration of ammonia in all media was increased steadily as incubation time proceeded until 9 hours. 3. The efficiency of adsorption of ammonia to zeolite of the feed added 40% urea mixture (dealing in the feed store) was hardly recognized. Accordingly, it is efficient to utilize the feed added 1~5% urea mixture, but it is of no use practica11y because they need much amount of zeolite.
RFID 다중 태그 인식을 위한 스택 Bit-By-Bit 알고리즘
이재구,유대석,최승식,Lee, Jae-Ku,Yoo, Dae-Suk,Choi, Seung-Sik 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.8a
RFID(Radio Frequency IDentification) 리더기가 영역내의 다수의 태그를 인식하기 위해선 충돌방지 알고리즘이 반드시 필요하다. 본 논문은 Auto ID Class 0에서 정의한 충돌방지 알고리즘인 Bit-by-Bit(BBB) 이진트리 알고리즘의 충돌 위치를 스택에 저장하고 이를 통해 다음 질의어를 결정함으로써 성능이 크게 개선된 Stack-Bit-by-Bit(SBBB) 알고리즘을 제안한다. 시뮬레이션을 통한 검증결과 대표적인 충돌 방지 기술인 Query Tree(QT)는 물론 기존의 BBB 알고리즘에 비해 질의-응답 횟수, 질의어의 크기, 응답어의 크기의 모든 면에서 성능이 개선된 것을 확인할 수 있었다. For the implementation of a RFID system, an anti-collision algorithm is required to identify multiple tags within the range of a RFID Reader. A Bit-by-Bit algorithm is defined by Auto ID Class 0. In this paper, we propose a SBBB(Stack Bit-by-Bit) algorithm. The SBBB algorithm save the collision position and makes a query using the saved data. SBBB improve the efficiency of collision resolution. We show the performance of the SBBB algorithm by simulation. The performance of the proposed algorithm is higher than that of BBB algorithm. Especially, the more each tag bit streams are the duplicate, the higher performance is.
RFID 다중 태그 인식을 위한 STACK Bit-by-Bit 알고리즘
이재구 ( Jae-ku Lee ),유대석 ( Dea-suk Yoo ),최재원 ( Jae-won Choi ),최승식 ( Seung-sik Choi ) 한국정보처리학회 2007 한국정보처리학회 학술대회논문집 Vol.14 No.1
RFID 리더기가 영역내의 다수의 태그를 인식하기 위해선 충돌방지 알고리즘이 필수적으로 요구된다. 본 논문은 Auto ID Class 0에서 정의한 충돌방지 알고리즘인 Bit-by-Bit 이진트리 알고리즘(BBB)의 돌 위치를 스택에 저장하고 이를 통해 다음 질의어를 결정함으로써 성능이 크게 개선된 Stack-bit-by-bit(SBBB) 알고리즘을 제안한다. 시뮬레이션을 통한 검증결과 질의-응답 횟수, 질의어의 크기, 응답어의 크기의 모든 면에서 성능이 개선된 것을 확인할 수 있었다.