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RSSI Based Path Finding of Mobile Robot in Sensor Network
Sung Gil Wee,Jung Won Choi,Suk Gyu Lee,Ju Hyun Park 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
We propose a new path finding approach for a mobile robot using the RF strength in a sensor network. In experiments based on the proposed method, a mobile robot finds its location, heading direction, and the shortest path under an indoor environment. The mobile robot is equipped with a base station to receive data from the environment around each node. When the robot moves from one point to another, it checks the strength of the received signal to find its path and uses a Kalman filter to reduce the error of the tangent. The experimental results show the effectiveness and applicability of the proposed method in path finding of a mobile robot.
Young Suk Kim,Jae Hyuck Choi,Kwang Sik Kim,Gil Chae Lim,Jeong Hong Kim.,Ju Wan Kang,Hee-Sung Song,Sang Ah Lee,Chang Lim Hyun,Yunseon Choi,Gwi Eon Kim 대한방사선종양학회 2017 Radiation Oncology Journal Vol.35 No.2
Purpose: To evaluate the effect of adjuvant external beam radiation therapy (EBRT) on local failure-free survival rate (LFFS) for papillary thyroid cancer (PTC) invading the trachea. Materials and Methods: Fifty-six patients with locally advanced PTC invading the trachea were treated with surgical resection. After surgery, 21 patients received adjuvant EBRT and radioactive iodine therapy (EBRT group) and 35 patients were treated with radioactive iodine therapy (control group). Results: The age range was 26–87 years (median, 56 years). The median follow-up period was 43 months (range, 4 to 145 months). EBRT doses ranged from 50.4 to 66 Gy (median, 60 Gy). Esophagus invasion and gross residual disease was more frequent in the EBRT group. In the control group, local recurrence developed in 9 (9/35, 26%) and new distant metastasis in 2 (2/35, 6%) patients, occurring 4 to 68 months (median, 37 months) and 53 to 68 months (median, 60 months) after surgery, respectively. Two patients had simultaneous local recurrence and new distant metastasis. There was one local failure in the EBRT group at 18 months after surgery (1/21, 5%). The 5-year LFFS was 95% in the EBRT group and 63% in the control group (p = 0.103). In the EBRT group, one late grade 2 xerostomia was developed. Conclusion: Although, EBRT group had a higher incidence of esophagus invasion and gross residual disease, EBRT group showed a better 5-year LFFS. Adjuvant EBRT may have contributed to the better LFFS in these patients.
무전해 니켈 / 금도금의 Bondability 향상에 관한 기초 연구
이주성,손원근,박수길,정승준,박정권,엄재석,전세호 한국공업화학회 1999 응용화학 Vol.3 No.1
The electoless plating has recently attracted considerable attention from these concerned with the fabrication of electronic devices because electroplating is not applicable to satisfy that circuits are becoming finer and denser. A bondability also is discussed on the one of the characteristic of electroless Ni/Au plating and it's contact material for the improving their high quality instruments was tried to developed in this wrok. So fianally, the bondability of the electroless Ni/Au finish were mesured successfully by gold wire full-test (wire diameter=1.2mil) and the bonding force could build up maxium about 7 g.
( Jung Gil Park ),( Soo Young Park ),( Si Hyun Bae ),( Jae Young Jang ),( Do Young Kim ),( June Sung Lee ),( Ki Tae Suk ),( In Hee Kim ),( Heon Ju Lee ),( Woo Jin Chung ),( Byoung Kuk Jang ),( Jeong I 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1
Background: Protein-calorie malnutrition is frequently observed in patients with advanced liver cirrhosis. There have been continued interests in potential benefits of long-term oral branched-chain amino acid (BCAA) supplement in improving severity of liver disease. However, there are limited evidences in literature. The aim of this study is to evaluate the efficacy of oral BCCA in patients with advanced liver cirrhosis. Methods: This study is a multicenter retrospective cohort study involving thirteen centers in Korea nation-wide. The inclusion criteria are liver cirrhosis patients with Child-Pugh score 8 to 10. The major exclusion criteria are abnormal serum creatinine level, and hepatocellular carcinoma (HCC) with viable tumor. We analyzed improvement of Model for End-Stage Liver Disease (MELD) score, Child-Pugh score, incidence of cirrhosis-related complications, and event free survival. Results: Among 360 patients recruited, 171 patients (82 patients BCAA group and 91 patients control group) met inclusion criteria for analysis. There were no significant differences between 2 groups in baseline characteristics except history of HCC. The BCCA group showed significantly better MELD score than control group (P=0.047). There was no significant difference in incidence of cirrhosis-related complications between two groups (P=0.392). The development of HCC tends to decrease in BCAA group compared to control group (hazard ratio, 0.39; 95% confidence interval, 0.14-1.11; P=0.079). Conclusions: Long-term oral BCAA supplement has beneficial effects in patients with advanced liver cirrhosis. Further largescale prospective study is needed for delineation of beneficial effects of oral BCAA agent in advanced liver cirrhosis patients.
Workstation / Server 구조의 객체 지향형 DBMS에서의 Selection 연산의 구현
이주홍(Ju-Heung Lee),김영길(Hai-Jin Chang),장혜진(Suk I. Yoo),유석인(Young-Gil Kim) 한국정보과학회 1991 한국정보과학회 학술발표논문집 Vol.18 No.2
Selection 연산은 DBMS(DataBase Management System)에서 질의 처리를 위한 기본적인 연산이며, 이 연산의 처리 속도 문제는 모든 DBMS에서 중요한 Issue이다. 특히, Workstation/Server Architecture를 사용하는 객체 지향형 DBMS에서는 이중 버퍼 기법의 사용에 의한 Object Buffer의 관리 문제와 Network을 통한 통신 효율 문제가 Selection 연산 처리의 효율과 밀접하게 연관되어 있다. 본 논문에서는 이중 버퍼 기법 및 하나의 Server 기계에 여러 대의 Workstation들의 대응을 가정한 시스템 구조를 설정하고, 설정된 시스템 구조상ㅇ서 Workstation들과 Server 기계간의 통신 부담, Server 기계의 부담을 고려한 Selection 연산의 구현 방식을 제시하였다.