무선 센서 네트워크에서 동적 히스테리시스 특성을 이용한 이동 노드의 가입 방법

이재형(Jae-Hyung Lee),이응수(Jae-Hyung Lee),김동성(Dong-Sung Kim) 大韓電子工學會 2011 電子工學會論文誌-CI (Computer and Information) Vol.48 No.4

본 논문에서는 무선 네트워크 환경에서 히스테리시스 특성을 이용한 이동 노드의 네트워크 가입 방법을 제안한다. 제안된 방법은 정적 히스테리시스 특성을 이용하여 이동 노드가 네트워크 전송 경계점에 위치했을 때 빈번히 가입과 탈퇴를 하게 되는 문제점을 해결한다. 그에 따라, 네트워크 가입 요청에 따른 주변 노드들의 응답 패킷을 줄여 에너지 소비를 효율적으로 관리 할 수 있다. 하지만 정적 히스테리시스 방법은 네트워크의 가입률을 감소시키게 된다. 이러한 문제점을 해결하기 위해 동적 히스테리시스 방법을 적용하여 가입률을 향상시킨다. 제안된 방법의 효용성을 증명하기 위해서 히스테리시스 모델들을 적용한 네트워크 가입 방법을 구현하여 이동 노드의 경로에 따라 효율적으로 네트워크 가입됨을 보였다. In this paper, we propose a method for joining mobile nodes in wireless sensor networks using hysteresis features. It is possible to use static hysteresis, whereby joining and withdrawal are carried out repeatedly when a mobile node is located at boundary points. The energy consumption of the nodes can be effectively managed by a decrease in the response packets of the neighbors under the joining requests of the mobile nodes. However, static hysteresis causes a decrease in the joining rate. In order to increase the joining rate, dynamic hysteresis is used. To evaluate the performance of the proposed technique, the joining rate is investigated and analyzed. Simulation results show that the proposed method enables efficient joining according to the mobility of nodes in wireless sensor networks.

산업용 무선 통신망에서 히스테리시스 특성을 갖는 이동 노드의 네트워크 가입 방법

이재형(Jae-Hyung Lee),이응수(Eung-Soo Lee),김동성(Dong-Sung Kim) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6

센서 네트워크의 이동 노드를 위한 효율적 네트워크 구성 방법

이재형(Jae-Hyung Lee),이응수(Eung-Soo Lee),김동성(Dong-Sung Kim) 大韓電子工學會 2010 電子工學會論文誌-CI (Computer and Information) Vol.47 No.6

본 논문에서는 근거리 저속 무선 기술인 IEEE 802.15.4 표준을 이용한 무선 센서 네트워크 환경에서 노드의 이동성을 고려한 효율적 네트워크 구성 방법을 제안하였다. 제안된 MSBS 방법은 BOP 구간을 이용하여 이동 노드의 네트워크 가입 시 보다 향상된 처리 속도로 가입절차를 수행하며, 이웃 노드들의 Depth, RSSI, 트래픽량을 고려하여 효율적으로 네트워크 구성을 한다. MSBS 방법은 트래픽이 집중되어 있는 노드를 통한 네트워크 가입을 방지하고, RSSI가 높은 노드를 통하여 네트워크 가입 절차를 수행하므로 통신 품질을 향상시킨다. 제안된 방법의 효용성을 증명하기 위하여 MSBS 방법을 적용한 IEEE 802.15.4 시뮬레이션 모델을 구현하여 이동 노드의 경로에 따라서 효율적으로 네트워크 구성함을 보였다. In this paper, an efficient network configuration method is proposed for mobile nodes in LR-WPAN (Low Rate Wireless Personal Area Network) based on the IEEE 802.15.4 standard. The proposed MSBS (mobile sensor beacon setup) method can be used to implement a joining procedure by which an improved processing rate can be achieved. This improvement is achieved by using BOP (Beacon only Period). In this method, the performance of mobile nodes is enhanced by using information on depth, traffic, and RSSI (Received Signal Strength Indication). By using the MSBS method, trusted data can be transferred and traffic overloads that occur at specific nodes can be prevented. The information obtained from the mobile nodes in wireless networks is analyzed using the proposed method, in order to study the performance of the method. Simulation results show that the MSBS method can be used to obtain an efficient network configuration according to the mobility of nodes in LR-WPAN.

이더넷 기반의 태양광 발전용 위치추적 시스템의 분산제어 시스템 설계 및 구현

이응수(Eung-Soo Lee),이재형(Jae-Hyung Lee),윤진식(Jin-Sik Yun),김동성(Dong-Sung Kim) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6

임신 34 - 36 주의 조산 : 과연 위험한 것인가 ?

안재형(Jae Hyung Ahn),최형민(Hyung Min Choi),황영수(Young Soo Hwang),홍성훈(Seong Hoon Hong),정병준(Byeong Jun Jung),전명권(Myung Kwon Jeon),이응수(Eung Soo Lee) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.1

N/A Objective : We performed this study to determine the safety and danger of preterm delivery at gestational age 34-36 weeks through antenatal profiles, neonatal conditions, neonatal morbidities. Methods : We reviewed our antenatal and neonatal data between December 1999 and April 2001 to determine the morbidities of infants delivered at gestational age 34-36 weeks using χ2test and Fisher's exact test. Results : 1. Mean age was 30.8±4.58yrs and mean gravida was 2.68±1.56. Preterm premature rupture of membrane was higher in preterm delivery at gestational age 34 and 35weeks(respectively 58.6%, 50%). There was no difference in using tocolytics but, antenatal steroid treatment for prevention of respiratory distress syndrome(RDS) was most frequent in gestational age 34weeks.(20.68%) 2. There was no difference in the risk factor of preterm labor at each group. 3. 1-minute Apgar score<7 was significantly more frequent in neonates at gestational age 34weeks but neonatal weight and meconium staining were not different. 4. The rate of neonatal intensive care unit(NICU) admission was significantly higher in neonates delivered at gestational age 34weeks(93.1%), and RDS occurred in 3 cases delivered at gestational age 34weeks(10.34%). 2 cases delivered at gestational age 34 weeks needed the use of ventilator. Conclusion : Our study shows significant differences in neonatal morbidities between 34weeks and the others. In particular, all cases of Respiratory distress syndrome(n=3) occur in neonates delivered at 34weeks gestation not receiving antenatal steroid treatment and neonatal morbidities at 35 and 36weeks of gestation were not different with full term gestation.

체외수정 및 배아이식 후의 일란성 쌍태임신 3례

최성연,정병준,최형민,강영제,이응수,송현진,Choi, Sung-Yun,Jung, Byeong-Jun,Choi, Hyung-Min,Kang, Young-Jae,Lee, Eung-Soo,Song, Hyun-Jin 대한생식의학회 2000 Clinical and Experimental Reproductive Medicine Vol.27 No.3

Objective: To report three cases of monozygotic twinning after IVF-ET transfer. Methods: Private practice in two different assisted reproductive technology clinics. Results: Three intrauterine monozygotic twin pregnancies occurred after IVF-ET. One of them was complicated by cord entanglement, another is progressing normal pregnancy without complication and the other was had a normal pregnancy without complication and delivered twin by cesarean section. Conclusion: The reported prevalence of multiple gestations in IVF-ET is a approximately 30%, and it is only 2.7% to be monozygotic twinning in IVF-ET. We report three cases of monozygotic twining after IVF-ET.

경계성 난소 종양 환자의 진단과 치료에 있어서 혈청 CA-125치의 임상적 의의

권혁,함형주,장선희,고재환,김용봉,이응수,박성관 인제대학교 1996 仁濟醫學 Vol.17 No.3

종양 표지물질인 CA-125는 악성 난소 종양의 진단 및 치료에 있어서 유용한 것으로 되어 있다. 그러나 경계성 난소 종양에 있어서는 아직 충분히 확립되지 못한 실정이다. 이에 저자들은 1989년 1월부터 1995년 12월까지 만 7년동안 인제대학교 의과대학 부속 서울백병원 산부인과에서 경계성 난소 종양으로 진단받았던 15명의 환자와 악성 난소 종양으로진단받았던 54명의 환자를 대상으로 각각에 대한 치료 전 및 치료 후 혈청 CA-125 치를 측정하여 비교 분석하여 경계성 난소 종양 환자의 진단과 치료에 있어서 혈청 CA-125치가 유용한지를 알아보고자 이 연구를 시행하였다. Serum tumor marker, CA-125 has been investigated extensively for it's usefulness in the diagnosis and management of malignant ovarian tumors. However, the role of serum CA-125in the diagnosis and management of patients with borderline ovarian tumors has not beenestablished. Retrospective analysis of serum CA-125 levels was performed in 15 patientsbefore operation and after treatment for borderline epithelial ovarian tumors at the Seoul Paik Hospital between 1989 and 1995. The result obtained were as follows : 1.The incidence of borderline malignant ovarian tumor among 69 cases of total group was 21.7%. 2.According to FIGO classification the patients were classified as: stage Ia (66.6%), stage Ib (6.7%), swage Ic (13.3%), stage IIc (6.7%), stage IIIa (6.7%). 3.The tumor sizes between patients with normal(less than 35 U/ml) and positive (over than 35 U/ml) of serum CA-125 were 15.43±5.06 cm and 15.78±4.91 cm, respectively and there was no statistical difference between the two groups (p> 0.05). 4.100% of serous and 46.2% of mucinous tumors had elevated CA-125 levels, and there was no statistical difference between the two groups(p> 0.05). 5.Combining both cell types, 6(46.2%) of 13 patients with swage I disease and 2(100%) of 2 patients with stage II and III disease had positive preoperative levels. Serum CA-125 level was no statistical difference between the two groups (p=0.467). 6.Serum CA-125 revels in patients with serous tumors (N=2) were decreased after surgery from 259.00 U/ml to 152.23 U/ml(p=0.04), and wish mucinous tumors (N=13) from 152.23 U/ml to 12.98U/ml (p=0.04) 7.CA-125 levels in patients with positive CA-125 level(N=8) were decreased after surgery from 294.57 U/ml to 18.01 U/ml (p=0.04), and with normal CA-125 level (N=7) from 7.61 U/ml to 5.25 U/ml (p=0.01). 8.Preoperative serum CA-125 levels in patients with malignant epithelial ovarian turners were 372.85 U/ml, and with borderline epithelial ovarian tumors were 166.47 U/ml. There was statistical difference between the two groups (p=0.006). These data suggest that preoperative serum CA-125 level correlates with stage of disease and serum CA-125 levels decrease after surgery regardless the initial level before treatment.