AWGN 채널 환경에서 BER 성능 향상을 위한 블록 인터리버에 관한 연구

박형근 남서울대학교 2007 남서울대학교 논문집 Vol.13 No.3

ABSTRACT : It is well known the fact that the BER performance improves throughthe iterative decoding and the interleaving in an AWGN channelenvironment. However, as the number of iterations and the size ofinterleaver are increased, it is required much decoding delay,computation, and power consumption for an iterative decoding.In this paper, efficient block interleaver is proposed. The computersimulation results showthat it has BER performance improvement of0.2dB compared toconventional block interleaver.

유무선 통신망의 보안을 위한 대칭형 블록 알고리즘에 관한 연구

박형근 남서울대학교 2007 남서울대학교 논문집 Vol.13 No.4

New symmetric algorithm is suitable network environment and wire/wireless communication network, on implement easy, security rate preservation, scalable & reconfigurable. Though proposed algorithm strengthens security vulnerability of TCP/IP protocol and keep security about many user as that have authentication function in network environment, there is important purpose. So that new symmetric cryptographic algorithm implemented by hardware base cryptosystem and en/decryption is achieved at the same time, composed architecture. Key Words : symmetric block algorithm, cryptosystem, network security

이동통신 시스템을 위한 레이크 수신기의 성능 개선에 관한 연구

박형근 남서울대학교 2007 남서울대학교 논문집 Vol.13 No.3

In this paper, we proposed the new structure of the Rake Fingerusing Walsh Switch, the shared accumulator, and the pipelineFWHT(Fast Walsh Hadamard Transform) algorithmfor reducing thesignal processing complexity resulting fromthe increase of the numberof data correlators. The functionsimulation of the proposed architectureis performed by Synopsys tool and the timing simulation is performedby Compass tool. The number of computational operation in theproposed data correlators is 160 additions and the conventional ones is512 additions when the number of walsh code channels is 4.

아급성기 대량 재해 지역에서의 의료 지원 : '99 대만 지진 의료 지원을 중심으로

송형곤,강보승,송근정,정연권 대한응급의학회 2000 대한응급의학회지 Vol.11 No.3

Background: There was a powerful earthquaken(Richter Scale 7.6) In Tiawan, on Sep.21, 1999. We supported the organized medic긴 services in that area during 5 days. Methods: We made the protocol and analyzed the results prospectively. Results: We took care of a total of 708 patients from sep. 23 to sep. 27. Traumatized patients related to the earthquake were 245(34.6%), and most of them had minor injuries. Two hundred thirty-nine(239, 33.8%) patients visited us for medical disease related to living in a group. There were 29(4.1%) patients who complained of neuropsychiatric problems due to the post-earthquaken stress. Because the condition of the patients was so bad, 18(2.5%) were transferred to receive more medical services. Conclusion: In disaster area, organized medical services have two different roles, especially in the subacute stage. One is responsibility for real emergency medical care, and the other is medical care of non-emergency patients.

연판정 출력 평균값을 이용한 반복복호 중단 알고리즘에 관한 연구

박형근 남서울대학교 2005 남서울대학교 논문집 Vol.11 No.1

Turbo codes proposed by Berrou et al. in 1993 attracted enormous attention among the coding society due to the excellent empirical performance achieved by a simple encoding structure and a practical, implementable iterative decoding algorithm, the so-called turbo principle. Turbo codes have been shown to perform close to the Shannon limits at bit error rates (BER) between 10^(-4) and 10^(-6). However, because turbo codes has been required much decoding delay to increase iteration number, it demands unnecessary iterative decoding. Therefore, in this paper, we propose iterative decoding stop criterion that uses the average value of LLR. This algorithm can be reduced average iterative decoding number and had lossless performance of BER, because of decreasing unnecessary iterative decoding.

응급의료 헬리콥터를 이용한 환자이송에 대한 고찰

송형곤,김병철,송근정,정연권,신백효 大韓應急醫學會 1998 대한응급의학회지 Vol.9 No.4

Background: The first EMS helicopter was introduced to Korea in 1996 and from Dec. 1. 1997, it was used for transporting emergent patients. Authors, here upon, report the transporting experiences. Methods: From Dec. 1, 1996 to Dec. 31, 1997, Samsung Medical Center's EMS helicopter was used for air evacuation of critically ill patients. The patients data prospectively analyzed. Result: A total of 65 patients were transported. Male to female ratio was 1.95:1. The mean transport time was 64.1 min(10 - 160 min). Majority of the evacuated patients was surgical patients (General Surgery : 16, Orthopedic surgery : 10, Neurosurgery : 6, Internal medicine : 13, Pediatrics : 3, and others : 3). Twenty-one of the 65 patients transported were admitted to ICU and 31 did not require ICU care. During the air evacuation, one physician and one nurse trained for air evacuation attended the patients. No medical problems or deaths developed during the air evacuation period. Conclusion: The first EMS helicopter was introduced to Korea in 1996. From Dec. 1, 1996 to Dec. 31, 1997, Samsung Medical Center's EMS helicopter was used for air evacuation of critically ill patients. The patients data reported.

퍼지 확률 알고리즘을 이용한 채널 적응등화기 설계

박형근,나유찬 남서울대학교 2004 남서울대학교 논문집 Vol.10 No.-

For high-speed data communication in band-limited channels, main of the bit error are fading and ISI(Inter-Symbol Interference). The common way of dealing with ISI is using equalization in the receiver. In this thesis, channel adaptive equalizer which uses Fuzzy Stochastic Gradient(FSG) and Constant Modulus Algorithm(CMA) is nonlinear equalizer, or Blind equalizer, that works directly on the signals with no training sequences required. This equalizer employs Takagi-Sugeno's fuzzy model that uses the FSG algorithm, to automatically regulate the step size of the descent gradient vector, combining fast convergence rate and low mean square error(MSE), and the CMA which is a special case of Godard's algorithm, to having multiple dispersion constants(R_(D)).

박물관의 기원과 공간구조

김형준,박정근 제주대학교 공과대학 첨단기술연구소 2006 尖端技術硏究所論文集 Vol.17 No.1

This study is to examine the origin of museum and its spatial structure. The purpose is to understand architecture in the modern life as the origin of the modern architecture in the 20th century, and to reveal the authenticity of modern spaces through spaces of museums. Museums are one of the leading architectural themes from the nineteenth century to the present day. Having a vast influence on entire Europe, they are new modern institutional buildings emerging with new modern technologies and culture. This study analysis museums through three viewpoints in the modern institutional buildings which were 'time', 'boundary' and 'perception'. As a result, spatial structure in museums were formed by things, people and space which were related to the three viewpoints. The phenomenon and the process in the spatial structure of museum are related to the modern architecture, and also relations in the space of museum are extended to the city and the architecture in the present day.

METRx™ 기구를 이용한 후방 경추부 추궁추간공 제거술의 예비 결과

박형천,윤승환,박종운,하윤,현동근,김은영,박현선,임대철 대한척추신경외과학회 2004 Neurospine Vol.1 No.1

Objectives: Posterior cervical microscopic laminoforaminotomy has been a preferred procedure for a posterolateral cervical disc or foraminal stenosis. However, neckpain from wide skin incision and muscle injury are some of disadvantages. The authors performed cervical microscopic laminoforaminotomy with METRx™ tubular dilator system and were compared the results with classical cervical microscopic foraminotomy. Methods: Six patients underwent posterior cervical microscopic laminoforaminotomy using the METRx™ during 6 months. We have selected 10 patients from our institution as a comparison group. Preoperative and postoperative pain score composed of the radicular and neck component was examined and disability score also recorded. Diameters and lengths of laminoforaminotomy on the postoperative CT also were compared with two methods Results: Postoperative pain scores to the radiculopathies were not different but postoperative pain scores to the neckpain on the follow up periods were significantly different. The average vertical and transverse diameters of the laminoforaminotomy defect on the postoperative CT scans were not different between two groups. Average hospital stay of the classical methods was 8.8±7.5 days comparison with 4.5±0.54days of new procedure. Conclusions: Posterior cervical microscopic laminoforaminotomy with METRx™ systems seems to provide similar decompression and clinical results as classical methods compared to classical methods and shows superior results for postoperative neckpain and hospital stays.

선택적 후근절제술의 수술중 근전도 감시방법과 치료효과

김형일,김연희,김완호,김근수,김동찬 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.10

Selective posterior rhizotomy(SPR) has been known to reduce the spasticity as well as to improve the quality of life in patients with intractable spasticity. Twenty patients underwent SPR under intraoperative electrophysiological monitoring(IOM). Fifty-two percent of sacrolumbar rootlet were cut after electrical stimulation. Eighteen patients(90%) with spastic type of cerebral palsy showed marked reduction of spasticity and functional improvement without any complication. The patients who did not respond to SRP had mixed types of spasticity. IOM facilitate the selection of pathological rootlets regardless of anaesthetic level. intensity of electrical stimulation, and individual variability of responses. It is concluded that careful selection of surgical candidates and of pathological rootlets under IOM are important to reduce the spasticity. thereby to obtain a better outcome.