• Title/Summary/Keyword: Sun block

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Parameter Estimation of The Distributed System via Improved Block Pulse Coefficients Estimation

  • Kim, Tai-hoon;Shim, Jae-sun
    • 제어로봇시스템학회:학술대회논문집
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    • 2002.10a
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    • pp.61.6-61
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    • 2002
  • In these days, Block Pulse functions are used in a variety of fields such as the analysis and controller design of the systems. In applying the Block Pulse function technique to control and systems science, the integral operation of the Block Pulse series plays important roles. This is because differential equations are always involved in the representations of continuous-time models of dynamic systems, and differential operations are always approximated by the corresponding Block Pulse series through integration operational matrices. In order to apply the Block Pulse function technique to the problems of continuous-time dynamic systems more efficiently, it is necessary to find th...

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A Derivation of Operational Matrices via Improved Block Pulse Coefficients Estimation Method (개선된 블럭 펄스 계수 추정 기법을 이용한 적분 연산 행렬 유도)

  • Kim, Tai-Hoon;Shim, Jae-Sun;Lee, Hae-Ki
    • Proceedings of the KIEE Conference
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    • 2003.07d
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    • pp.2277-2279
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    • 2003
  • This paper presents a new method for finding the Block Pulse series coefficients and deriving the Block Pulse integration operational matrices which are necessary for the control fields using the Block Pulse functions. This paper presents the method for improving the accuracy of the Block Pulse series coefficients and derives the related integration operational matrices by using the Lagrange second order interpolation polynomial and expands that matrix to general form.

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Piecewise Phase Recovery Algorithm Using Block Turbo Codes for Next Generation Mobile Communications

  • Ryoo, Sun-Heui;Kim, Soo-Young;Ahn, Do-Seob
    • ETRI Journal
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    • v.28 no.4
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    • pp.435-443
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    • 2006
  • This paper presents an efficient carrier recovery algorithm combined with a turbo-coding technique in a mobile communication system. By using a block turbo code made up of independently decodable block codes, we can efficiently recover the fast time-varying carrier phase as well as correct channel errors. Our simulation results reveal that the proposed scheme can accommodate mobiles with high speed, and at the same time can reduce the number of iterations to lock the phase.

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Ultrasound-guided Femorosciatic Nerve Block by Orthopaedist for Ankle Fracture Operation (족관절 골절 수술을 위한 정형외과 의사의 초음파 유도 대퇴좌골 신경 차단)

  • Kang, Chan;Hwang, Deuk-Soo;Kim, Young-Mo;Kim, Pil-Sung;Jun, You-Sun;Hwang, Jung-Mo;Han, Sun-Cheol
    • Journal of Korean Foot and Ankle Society
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    • v.14 no.1
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    • pp.90-96
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    • 2010
  • Purpose: The purpose of this study is to investigate the usefulness of ultrasound-guided femorosciatic nerve block by orthopaedist to operate the fracture around ankle. Materials and Methods: Twenty-two patients, who had an operation for fracture around the ankle under a ultrasound-guided femorosciatic nerve block from January to April 2010, were the targets of this study. We measured the time spent for the ultrasound-guided femorosciatic nerve block, the time taken to start the operation after the nerve block, the time taken to deflate the tourniquet because of a tourniquet pain, the time passed until feeling a postoperative pain after the operation, etc. We also studied the complications and satisfaction of the anesthesia. Results: It took 6.2 (3 to 12) minutes for the nerve block, 46.1 (28 to 75) minutes to start the operation, 52.5 (22 to 78) minutes until feeling a tourniquet pain and 11.5 (7.5 to 19) hours until starting to feeing a postoperative pain. There was no complication by anesthesia and 21 people (95.5%) were satisfied with anesthesia by ultrasound-guided femorosciatic nerve block. Conclusion: Ultrasound-guided femorosciatic nerve block by orthopaedist in the fracture around ankle reduces anesthetic and nerve injury complication, and leads to high anesthetic success rate. Also it is considered as an effective method to alleviate postoperative pain.

Concrete Stress Block Parameters for High-Strength Concrete : Recent Developments and Their Impact

  • Bae, Sun-Gjin
    • International Journal of Concrete Structures and Materials
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    • v.18 no.1E
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    • pp.11-16
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    • 2006
  • The use of the current ACI 318 stress block parameters has been reported to provide unconservative estimations of the moment capacities for high-strength concrete columns. Accordingly, several concrete stress block parameters have been recently proposed. This paper discusses various concrete stress block parameters for high-strength concrete and their influences on the code provisions. In order to adopt the proposed stress block parameters to the design code, it is necessary to understand the impact of the change of the stress block parameters on various aspects of the code provisions. For this purpose, the influence of using of different stress block parameters on the location of the neutral axis and the tensile strain in extreme tension steel as well as the axial and moment capacities are investigated. In addition, the influence on the prestressed concrete members is also elucididated.

A Study on Post Occupancy Evaluation of Block Housing -Focused on The Block Housing in Eunpyeong New Town, in Korea - (가구형 집합주택의 거주후평가 연구 - 은평뉴타운을 중심으로 -)

  • Park, Joong-Hyun;Choo, Sun-Kyong;Kang, Boo-Seong
    • Proceeding of Spring/Autumn Annual Conference of KHA
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    • 2009.04a
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    • pp.73-77
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    • 2009
  • The block housing type is coming to fore as a 'low-rise high-density housing type', which can resolve the all sorts of problem caused in Korea apartment housing complex and single-detached residental area in terms of livability, urbanity, and community. To analyze the characteristics of the block housing, the block housing in Eunpyeong New Town, in Korea was analyzed as a sample for post occupancy evaluation. The analysis show that the block housing is useful low-rise and high-density housing type, which ensures the livability as well as the urbanity and community. In details the analysis also shows the user satisfaction from the perspective of living and facility use within the block housing and individual unit.

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Block Shear Failure : State of the Arts (블록전단파괴 : State of the Arts)

  • Jang, Sun-Jae;Lee, Woo-Chul;Lim, Nam-Hyoung;Lee, Chin-Ok
    • 한국방재학회:학술대회논문집
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    • 2008.02a
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    • pp.75-78
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    • 2008
  • Limit states of a tension member are the yielding of gross section, fracture of net section, and block shear failure. Block shear failure is very complicated than other limit state because of interaction of tension and shear failure. Block shear failure is studied continuously since the 1970s. However, failure model to estimate the strength of block shear failure provided in current design specifications is not reflective of the failure mode observed in the various experimental studies. Comparisons between the experimental results and design rules in various specifications about the block shear failure were conducted in this study. Also, the need for further studies of block shear failure were proposed.

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Changes of Index Finger Temperature as Indices of Success of Thoracic Sympathetic Ganglion Block (다한증 환자에서 흉부 교감신경절 차단과 인지 체온 변화와의 관계)

  • Lee, Hyo-Keun;Yoon, Kyung-Bong;Suh, Young-Sun;Kim, Chan
    • The Korean Journal of Pain
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    • v.7 no.2
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    • pp.217-221
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    • 1994
  • Percutaneous neurolysis of upper thoracic sympathetic ganglion was performed in 40 patients by simultaneously injecting 3 ml of pure alcohol into the T2 and T3 levels after 3 ml of injection of local anesthetic agent on the same sites. Using a skin temperature probe, finger tip temperatures were measured on the index finger ipsilateral to the nerve block before block, 15 and 30 minutes after test block, and 30 minutes after alcohol block. Alcohol block was performed immediately after 30 minutes test block. Finger tip temperatures obtained at 30 minutes post alcohol block and test block and the differences in the temperatures measured before and 30 minutes after alcohol block were shown to be statistically important as potential indicators for prediciting long term outcome of therapy for palmar hyperhidrosis using this technique. These results demonstrate that the palmar temperature monitoring method is sufficiently sensitive to predict the outcome of nerve block during and after thoracic sympathetic ganglion block.

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Analysis of Fifty-five Patients with Gasserian Ganglion Block (삼차신경절 차단을 받은 55예의 분석)

  • Lee, Sun-Hak;Kim, Yong-Ik;Kim, Jin-Soo;Cho, Wook-Yeon;Park, Wook
    • The Korean Journal of Pain
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    • v.10 no.1
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    • pp.11-15
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    • 1997
  • Background : There are several treatment of trigeminal neuralgia including Gasserian Ganglion Block. This paper retrospectively analyze the efficacy of Gasserian Ganglion Block as main treatment of trigeminal neuralgia. Methods : We studied 55 patients for followings; sex, age, duration from onset to visit, consulted mediator, causes, characteristics of pain, affected area, types of block, kinds and volume of used neurolytic agents, duration from first block to repeat block, types of repeat block, complications, if surgery was necessary after block. Results : Characteristic items of trigeminal neuralgia are similar with other studies. Mean duration of pain relief was 23 months. The duration was shortened in the repeat block. There were no significant complication. Conclusion : Considering Gasserian Ganglion Block as main treatment of trigeminal neuralgia is an effective and safe method. Therefore we would like to recommend the need to increase public awareness of trigeminal neuralgia and its possible treatment in pain clinics through mass commanication.

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Study on the Physicochemical Properties of Crosslinked Poly(Styrene-Butadiene-Styrene) Block Copolymers Prepared by Radiation (방사선으로 제조된 가교 구조의 Poly(Styrene-Butadiene-Styrene) 블록 공중합체 특성에 관한 연구)

  • Lee, Sun-Young;Song, Ju-Myung;Sohn, Joon-Yong;Shin, Junhwa
    • Journal of Radiation Industry
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    • v.6 no.2
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    • pp.171-176
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    • 2012
  • In this study, a crosslinked poly(styrene-butadiene-styrene) [SBS] block copolymers were prepared by using gamma ray irradiation method. The effects of various radiation doses on the degree of crosslinking, thermo property, and morphology of crosslinked SBS block copolymer were investigated. The degree of crosslinking of crosslinked SBS block copolymers were measured by gel-fraction and FT-IR. It was found that the degree of crosslinking of crosslinked SBS block copolymers increases with increase of the irradiation dose while the TGA result shows that the initial degradation temperature of irradiated SBS block copolymer was shifted to lower temperature with increasing irradiation dose. These results indicate that degradation reaction also occurs when SBS block copolymer is exposed to gamma ray irradiation for crosslinking reaction. The SAXS and FE-SEM results indicate that the phase separation of the styrene block and butadiene block was reduced with increasing irradiation dose.