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음성의 저속전송을 위한 선형예측 부호화기의 개발에 관한 연구
김재인(Jae In Kim),송길호(Kil Ho Song),이인홍(In Hong Lee),조위덕(We Duke Cho),이진익(Jin Ick Lee) 한국정보과학회 1987 한국정보과학회 학술발표논문집 Vol.14 No.2
본 논문은 T.I.사이의 TMS320C10 DSP chip을 사용한 2.4kbps의 선형예측 부호화기 개발에 관한 것이다. 이 시스템은 analog interface로서 A-law PCM codec을 사용하여 저가격화를 실현하였을 뿐 아니라, pitch doubling을 방지하고 유/무성음 판단오류를 줄이기 위한 smoothing 알고리즘을 적용하였으며, pitch synchronous 합성 방식을 적용하였다. 그 결과 음질은 AM 라디오 방송을 듣는 느낌을 가질 정도의 우수한 성능을 나타내었고, 또한 여성의 음성을 알아 듣는데 별 지장이 없으며 화자의 구별도 용이하였다. 그리고 개발된 선형예측 부호화기에 2.4kbps MODEM을 접속시켜 기존의 전화 교환망에서 사용이 용이하도록 하였다.
보해석에서 온도하중에 대한 Generalized Functions의 활용
곽순섭(Kwak Soon-Seop),송길호(Song Kil-Ho) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.1
The form of differential equation related with beam analysis is Lω(χ) = f(χ), where is a linear differential operator. The term related with distributed loads in D.E. is f(χ), which is continuous and differentiable function. As concentrated load and moment load can be expressed, using the Generalized Function, in terms of equivalent distributed loads, thermal loads also can be expressed in the form of Generalized Functions in f(χ). For example, the curvatures of the point thermal load and distributedthermal load can be expressed in terms of δ?(χ) and δ₁(χ) respectively. After two times differentiation of the curvatures, thefinal forms related with thermal loads in f(χ) are δ-2(χ) and δ-1(χ). How it is easy and simple to use the Generalized Functions in thermal loaded beam analysis is shown in several examples.
온도하중을 받는 Winkler 보에서 스프링 계수 K값에 따른 모멘트 변화
곽순섭(Kwak, Soon-Seop),송길호(Song, Kil-Ho),전두선(Jeon, Du-Seon) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.11
The curvature of the Winkler beam due to the thermal loads is “y″-κ”, where y is deflection curve, κ is curvature by the thermal load. The differential equation of the Winkler beam, when loaded by thermal load, is (EI(y″(χ)-κ))″+ky(χ)=0, where κ is spring constant. When the point thermal load is applied at χ=α, the curvature becomes κ=δ?(χ-α)αΔT/h, where α is the coefficient of thermal expansion, ΔT is thermal difference between upper and lower fiber of beam, h is the depth of beam and δ0 is the Generalized Function. With the aid of characteristics of Generalized Functions, the solutions of the mentioned differential equations are obtained systematically. When the moment Green Function due to the point thermal load is obtained, we can get the moment, when the partial thermal load is applied, through integration of the moment Green Function within the given range. The results of this study show, when the beams loaded by point thermal load and partial thermal load, how the values of deflection and moments change depending on the spring constant κ in four cases : ①Hinge-Hinge, ②Fix-Fix, ③Hinge-Fix, ④ Free-Fix. When the spring constant κ is zero, then the Winkler beam becomes general beam.
Winkler보에서 온도하중에 대한 Generalized Functions의 응용
곽순섭(Kwak Soon-Seop),송길호(Song Kil-Ho) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.7
In nonhomogeneous differential equation L(χ)=?(χ), related to the point thermal loaded Winkler beam, where L is a linear differential operator and load terms are appeared in ?(χ), it is difficult to express the thermal load in ?(χ). But with the aid of Generalized Functions, the thermal load can be described in ?(χ) and the particular solutions are easily got. The magnitude of curvature at the thermal loading point is ε/h, where ε is the strain in top fiber and h is the depth of beam. When the magnitude of curvature is “1”, the solution is Green Function. This Green Function can be used and applied to get the other Green Functions in Free-end, Hinge and Fixed-end respectively. Finally we can get solutions of any types of thermal load using these Green Functions.
곽순섭(Kwak, Soon-Seop),송길호(Song, Kil-Ho),김성식(Kim, Seong-Sik) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.12
In the axial Winkler model, the axial strain increased by the temperature change T is αT, where α is the coefficient of thermal expansion. When a point thermal load T is applied x=a, the thermal strain can not be expressed in the form of continuous function in the given range. But using the generalized function, the thermal strain can be expressed like αT??(x=a), which is differentiable. And that, with the aid of characteristics of generalized functions the particular solution of the governing differential equation is also easily obtained. When the solution of the point thermal loaded case is known, then the solution of the partial or whole loaded cases can be obtained by the proper integration over the given range. This study shows that how the displacement u(x) and axial force N(x) can be obtained, depending on the ends conditions and boundary conditions, when thermal loads are applied. Moreover, when the axial spring constant κ changes, the trend of N(x) and u(x) can be known by the nondimensionalized N(x) and u(x).
곽순섭(Kwak Soon-Seop),김호수(Kim Ho-Soo),정성진(Jung Sung-Jin),송길호(Song Kil-Ho) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.9
Although Prefabricated Steel Pipe Scaffolding(PSPS) systems are frequently used in domestic construction sites, there is no any comment related to the overall capacity of the PSPS system 10 the Industrial Safety and Health Act (ISHA) but the ones describing the testing method and the capacity of the each member of PSPS So, if we want to use the PSPS systems as shores, It is necessary to know the overall capacity of the PSPS system, not the ones of the members but the one of the total PSPS frame In this study, first, vertical frame members which are the basic elements of the PSPS frame, are tested for finding out its capacity Second, the load tests about the overall strength of the PSPS system are performed in two ways, namely, for the one-story and the two-story PSPS frame In each case, the centric load(l/2 L) and the eccentric load(1/4 L, 0 L) tests are carried out, where L is the longer length of the PSPS frame according to the results of the experiments, first, the load beaning capacity of the one-story PSPS frame are larger than the one of the two-story PSPS frame at the same conditions Second, the centric load beaning capacity is larger than the one of the eccentric loading in the same story PSPS system.<br/>
박준모(Park Jun-Mo),김옥규(Kim Ok-Kyue),곽순섭(Kwak Soon-Seop),송길호(Song Kil-Ho),정훤우(Jeong Hweon-Woo) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
Recently, as the climate change, it has happened disaster on heave rain that surprised and concentrated in korea. Especially, It was a great shock to society that casualty of 71 by disaster on heave rain in late July. As disaster on heave rain, it need to sort to the mess and restore that a road, electric power line, supply of drinking water, and so on. Furthermore, it is necessary to put an adequate construction temporary such a technology, manpower, equipment and so on. In this study, it review the of construction temporary system to recover from disaster about very important national infrastructures. As a result, it is possible to apply to system over all part. It will keep up study to research on each part in depth.