http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
JPEG2000의 EBCOT의 효과적인 비율왜곡제어 알고리즘
백창희(Chang Hui BAEK),박세승(Sei Seung PARK),이강현(Kang Hyeun RHEE) 한국정보기술학회 2007 Proceedings of KIIT Conference Vol.2007 No.-
본 논문은 JPEG2000 인코더의 EBCOT 알고리즘의 수행속도 향상을 위한 효율적인 비율왜곡제어 알고리즘을 제안하였다. 수행시간 단축을 위하여 EBCOT의 Tire-1연산부와 Tier-2연산부 사이에 코딩패스의 비율-왜곡기울기 감소특성을 만족하지 않는 코딩패스를 제거하는 전처리 모듈을 삽입함으로써 Tier-2 연산의 제한상수 갱신횟수를 감소시켰다. 제안된 알고리즘은 PXA255상에서 GCC를 이용하여 구현되었으며, Tier-l 연산부는 알테라사의 FPGA(Cyclone Ⅱ)상에 구현하였다. 제안된 알고리즘을 사용하였을 때 기존의 알고리즘을 사용한 경우보다 70%정도의 수행속도 향상을 보였으며 PSNR은 기존의 압축영상에 비해 1~2dB정도의 오차를 보였다. In this paper, we proposed an efficient rate-distortion control algorithm to increase processing speed of JPEG2000 EBCOT. We inserted preprocessing module between Tier-l processing modue and Tier-2 processing module to reduce the EBCOT processing time. The propoesed algorithm was implemented with GCC on PXA255 platform, and the Tier-l processing module is implemented with VHDL on Altera FPGA(CycIone Ⅱ). As a result, the proposed algorithm can reduce the operation speed about 70% compared with conventional rate-distortion algorithm. And the proposed algorithm degrade the PSNR on image quailty as small as I dB to 2 dB compared with the compressed image using conventional rate-distortion algorithm.
노드 가중치를 이용한 센서 네트워크의 내부보안 및 에너지 효율 향상기법
백창희(Chang-Hui Baek),이강현(Kang-Hyeon Rhee) 대한전자공학회 2006 대한전자공학회 학술대회 Vol.2006 No.11
Since most of sensor networks are usaully not designed with security in mind, it is difficult to add a security on their design. Because of the limitation of a resource, most of sensor nodes use broadcasting communication. It means that adversaries can interfere or distrupt the other nodes. As an one of security protocol, In-Network can find the inner attckers before the data packet arrives to the base station. In-Network assumed that all check node was deployed uniformly. But in the actual field, sensor nodes are deployed randomly. When the check node is deployed to one side, the other side can be exposure to adversaries. In this paper, we proposed inhanced security protocol againt inner attackers and the energy efficiency in wireless sensor networks using weighted Node. We adopted weighted node mothod to In-network protocol and then we can set check nodes on the whole sensor network uniformly.
배대경,한정수,선승덕,백창희,이재훈,Bae, Dae-Kyung,Han, Chung-Soo,Sun, Seung-Deok,Baek, Chang-Hee,Rhee, Jae-Hoon 대한근골격종양학회 1995 대한골관절종양학회지 Vol.1 No.2
Giant cell tumor is most frequently found in juxtaarticular region, and difficult to treat because of local recurrence. Although primary resections reduce recurrence, the joint function will be markedly impaired. Techniques involving physical adjuncts(high speed burr and electric cauterization), acrylic cement or en bloc resection with VFG(vascularized fibular graft) have been employed to reduce local recurrence. From October 1984 to April 1994, twenty-nine patients diagnosed as giant cell tumor were treated at department of Orthopaedic Surgery, School of Medicine, Kyung Hee University. There were eleven men and 18 women, ranging in age from 17 to 52 years(mean: 34 years). The average follow-up period was four years and five months. The location of the lesion was around the knee in 15, distal radius in three, femoral head in three, and others in eight patients. Fifteen patients around the knee joint were treated with several modalities; curettage with bone graft in five, curettage with cement filling in three, curettage with bone graft and physical adjuncts in five, en bloc resection with VFG in one and en bloc resection with arthroplasty in one patient. The functional results, according to the Marshall's knee score, were excellent in one, good in two, and fair in two after the curettage with bone graft, good in three after the curettage with bone cement filling, excellent in one, good in four after the curettage with bone graft and physical adjuncts, and good in two after the en bloc resection with VFG or arthroplasty. Three patients had local recurrence among 15 patients with giant cell tumor around knee. Vascularized fibular graft around wrist joint provided good functional restoration without local recurrence in all three patients who had giant cell tumor in distal radius. Although there is no statistical significance, it seems that curettage with bone graft using physical adjuncts or acrylic cement reveals better results than simple curettage with bone graft. Excellent functional result were obtained without local recurrence by using vascularized fibular graft after en bloc resection.
곽광일(Kwak, Kwang-Il),백창희(Baek, Chang-Hee),류소연(Ryu, So Yeon) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.1
본 연구는 제 5기 전체(2010~2012)국민건강영양조사 자료를 이용하여 우리나라 노인의 신체활동 정도와 의료이용과의 관련성을 파악하기 위하여 실시하였다. 연구결과에서 비활동적인 신체활동군과 비교하여 활동적 신체활동군의 경우에 입원이용 가능성이 0.54배(OR;95% CI, p<0.001), 외래이용은 0.73배(OR;95% CI, p=0.040), 약국이용은 0.75배(OR;95% CI, p<0.007) 더 낮으것으로 나타났으며, 의료이용 횟수도 감소하는 것으로 나타났다. 또한, 최소 신체활동군의 경우에 비활동적 신체활동군과 비교하여 입원 의료이용 가능성이 0.64배(OR;95% CI, p<0.001) 낮고, 이용횟수도 감소하는 것을 확인하였다. 결론적으로 노인의 신체활동 정도에 따라서 의료이용과의 관련성을 확인하였다는 데 의의가 있으며, 신체활동을 활발하게 실천하는 것이 노인의 건강증진과 삶의 질을 향상시킬 뿐만 아니라 의료비 지출의 감소에도 도움이 될 것으로 사료된다. This study examined the relationship between the physical activity levels and health care utilization in Korean elderly based on the data from The fifth Korean National Health and Nutrition Examination Survey (K-NHANES Ⅴ). As a result, physically active participants were 0.54 times (OR;95% CI, p<0.001) less likely to use inpatient health care and 0.73 times (OR;95% CI, p=0.040) less likely to use outpatient health care and 0.75 times (OR;95% CI, p<0.007) less likely to use drugstores than physically inactive participants, and the frequency of health care use was lower. In addition, physically minimal active participants were 0.64 times (OR;95% CI, p<0.001) less likely to use inpatient health care than physically inactive participants; the frequency of other health care facilities was lower. In conclusion, the relationship between being physically active and lower health care utilization among Korean elderly identified in this study. This suggests that being physically active is helpful to the elderly, not only in health promotion and improving quality of life, but also in reduced medical expenditure.