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      • 유한 요소법에 의한 크로스-플라이 복합적층판의 해석

        송석은,이원홍 진주산업대학교 1998 산업과학기술연구소보 Vol.- No.5

        In general, cross-ply laminated compostie plates exhibit properties considerably different from those of the single-layer plate. The great difference in elastic properties between fiber and mtrix materials leads to a higher ratio of in-plane Young`s modulus to transverse shear modulus for laminated composite plates. Thus, to obtain the more accurate solutions to laminated composite plate problems, effcets of shear strain should be considered in analysis of them. The purpose si to expend the first-order shear deformation theory by Finite Element Analysis and to clarify the cross-ply laminated composite plates.

      • KCI우수등재

        암거배수에 의한 습답의 2모작에 관한 연구

        송석은,김시원 한국농공학회 1978 한국농공학회논문집 Vol.20 No.2

        The result which I tried to get double crops of potatoes on the wet paddy fields through the underdrainage of P V.C pipe from March 1977 to June 1977 in Jung cheon-Ri, Jinseong-men, Jinyang gun, Kungsangnamdo are followings.1. During this experimental period, the temperature on the average was 15.67$^{\circ}C$ (yearly mean 14.78$^{\circ}C$ that was suitable in growing potatoes, while the amount of rainfall was not much heavier from middle of April to early in May. Therefore the yield of potatoes in the wet fields was so high. 2. The soil temperature of the treated plot in the underground of 10cm, 30cm, 60cm, 80cm, has risen to 1.38$^{\circ}C$, 1.32$^{\circ}C$, 1.45$^{\circ}C$, 1.28$^{\circ}C$, comparing to the soil temperature in the control plot respectively. 3. The discharge from subdrainage pipes was 0.6751/sec/ha on the average. 4. The treated plot showed better growth than the control plot, and the yield has been increased 424.8%, while they have been preserved to be voluntary from the level of "t" test.

      • 건설공사의 예비비산정모형 구축에 관한 연구

        송석은 진주산업대학교 건설기술연구소 1998 건설기술연구소보 Vol.1 No.-

        Recently construction industry involves more risks occurred with increasing in size and complexity of construction projects. Risk has been recognized as one of the most serious problems through the construction performance control. Successful performance of construction project depends on managing and estimating of exact construction cost, but most of contractors have failed to systematically identify and evaluate the effect of internal and external risk elements related with construction projects. Also they don't have any methods or procedures to quantify the impact of risk on project time and cost. Therefore this study suggests a contingency estimating model to quantify the risks by using influence diagram, decision tree, and Monte Carlo simulation. The adequacy of proposed model are verified through case study.

      • TWO-PARAMETER 탄성지반위에 놓인 고차전단변형 직교이방성 적층판의 정적 및 동적해석

        송석은,이원홍 진주산업대학교 2000 산업과학기술연구소보 Vol.- No.7

        Static and Transient results for a Orthgtropic laminated plate on two-parameter elastic foundations base on a higher-order shear deformation theory are presented. The effects on central deflection by plate thickness ratio, material modulus ratio, ply lamination geometry, shear and winkler modulus of elastic foundations are investigated. To validate the derived equations, the obtained deflections of simply supported isotropic plates are compared with those of Timoshenko. The information presented should be useful to composite-structure designers, to researchers seeking to obtain better correlation between theory and experiment and to numerical analysts in checking out their programs.

      • 고차전단변형을 고려한 크로스-풀라이 적층판의 좌굴해석

        송석은,이원홍 진주산업대학교 1997 산업과학기술연구소보 Vol.- No.4

        Upto date, the buckling modes of the laminated composite plate have been studied in considering to the first-order shear deformation theory because these theory was used to easily obtain the bucking modes of them in classical theory. But the mechanical properties of laminated composite plate is quite different from those of the singe-layered isotropic structures. This study presents higher order shear strains are used to consinder the shear effects in order to obtain the more accurate solutions and to determine the buckling loads. In general, a higher-order shear deformation theory requires no shear correction coefficients and avoids considering shear, locking phenomenon. In this study, the parabolic distribution of the transverse shear and rotationary inertia moments through the thickness of the structures is taken anounts for. The buckling loads in the present study are shown the more exact values than those in existing study by the first-order shear deformation theory and/or the classical theory.

      • 경지정리답에서 이앙기의 작업능률에 관한 고찰

        송석은,신영철,김태규 진주산업대학교 1995 산업과학기술연구소보 Vol.- No.2

        경지정리후 경과년수와 써레작업후 경과일수 및 경심의 변화에 따른 이앙기의 주행상태를 조사하여 적정포장조건을 규명하고져 경지정리답(1, 2년)에서 실험을 실시한 결과를 요약하면 다음과 같다. 1. Cone index는 경지정리 경과년수가 길어질수록 토양이 안정되었고, 써레작업후 경과일수와 차륜침하에 따른 관계는 직선적으로 나타났다. 2. 구동토오크는 경지정리 경과년수와 써레작업후 경과일수가 길어질수록, 차륜침하가 적을수록 감소하였으며, 엔진탑재마력에는 충분한 여유가 있어 이앙기의 주행에는 크게 지장이 없을 것으로 생각되었다. 3. 슬립율은 경지정리후 2년구에서 16%로 가장 낮게 나타났으나 차륜의 침하 깊이가 클수륵 높게 나타났으며 써래작업후 결과일수가 증가할 때는 감소하였다. This study was carried out to investigation the work efficiency of transplanter according to the various elapsed years after land rearrangement and days after pudding and sinkage of transplanter. The results are summarized as follows ; 1. The relationship between cone index of wheel sinkage and the various elapsed years after land rearrangement and days after pudding appeared in a straight lined. 2. The pracitical work power for the various elapsed(1993 yera) after land rearrangement was about lps, which was the hightest among the plots, so the loading power(2.5~2.5ps) of these engine is considered to be enough for the trasplanting under these field conditions. 3. The percentage of splip was lowest(16%) in the various elapsed years(1994 year) after land rearrangement and was small as the wheel sinkage depth decreased and was diminished as the dlapsed days after pudding increased.

      • 외력도입에 의한 철근콘크리트 구조물 보강에 관한 연구

        송석은,황용진,신영철,하대원 진주산업대학교 산업과학기술연구소 1996 산업과학기술연구소보 Vol.- No.3

        외력도입에 의한 T형교각 보강검토톨 한 결과 다음과 같은 결론을 내릴 수 있다. 첫째, 철근콘크리트 구조물에 외력도입에 의한 보강은 균열부를 충진제로 마감 후 보강하는 것이 외력에 의한 단면의 응력변화를 명확하게 예측할 수 있다. 둘째, 철근콘크리트 구조물이 허용응력범위내에서는 거의 탄성적으로 거동하는 것으로 간주하고 외력에 의한 응력을 철근콘크리트 이론으로 구할 수 있다. 셋째, 현 2등교 T형 교각을 외력도입에 의하여 1둥교 교각으로 사용할 수 있다. The need for strengthening of existing bridges is a growing concern in many of bridges which were designed for relatively light or inadequate for present traffic. Numerous bridges in Korea are confronted with the problem that bridges constructed between 1960 and 1980 are not in compliance with current legal load. This condition results from increase in legal load limitations, changes in specifications, and increased dead load from resurfacing with concrete overlays. The best solution is to strengthening these existing bridges by prestressing that is an extremely cost-effective method. The basic principle of prestressing is that of the introduction of internal stress of such magnitude and distribution that the stress resulting from given external loadings are counteracted to a desired degree. Focus on this study is rehabilitation of T-shape pier by external posttensioning.

      • KCI등재

        반독점 집단소송에 있어 지배성 요건의 판단기준 - Comcast Corp. v. Behrend, 133 S.Ct. 1426 (March 27, 2013) -

        송석은,정호열 성균관대학교 법학연구원 2015 성균관법학 Vol.27 No.4

        Violation of the antitrust law usually causes widespread injuries to many participants in the market concerned. Class action may play a vital role in the remedy of collective interests as a tool of private antitrust enforcement. In Comcast Corp. v. Behrend, the U.S. Supreme Court decertified a class exceeding two million previous and current Comcast subscribers in the Philadelphia Designated Market Area (DMA) that accused Comcast of engaging in “clustering” violating the Sherman Act. The E.D. Pennsylvania district court certified the class pursuant to Federal Rule of Civil Procedure 23(b)(3), and the Third Circuit affirmed. To get a class certified under Rule 23(b)(3), the party seeking class certification must show that questions relating to the class as a whole “predominate” over questions pertaining to individual class members. Prior to Comcast, most courts had recognized that the presence of individualized damages issues normally did not preclude class certification. In Comcast, the Court stated: It is clear that, under the proper standard for evaluating certification, respondents' model falls far short of establishing that damages are capable of measurement on a class-wide basis. Without presenting another methodology, respondents cannot show Rule 23(b)(3) predominance: Questions of individual damage calculations will inevitably overwhelm questions common to the class. In the following, first of all, general requirements for certification of class action and specific contents of them are reviewed in the perspective of antitrust class action. Then, primary ruling contents of Comcast and trends after the ruling are reviewed. It is anticipated that, in the near future, antitrust class action would be adopted in Republic of Korea. In this situation, Comcast would be a kind of guideline for privates and lawyers who deal with antitrust class action practice, so, it would be contributed to the stable settlement of antitrust class action in Republic of Korea. 최근 미연방대법원은 설사 본안 판단과 중첩된다 하더라도, 집단소송의 허가요건을 엄격히 심사하여 그 허가를 거부하는 판결을 잇달아 내보내고 있다. 반독점 집단소송에 있어서도 2013년 Comcast Corp. v. Behrend 사건에서 공통 쟁점의 지배성 요건의 흠결을 이유로 허가를 거부하였다. 즉, 각 구성원들에 대한 인과관계 있는 손해액 산정이라는 개별 쟁점이, 독점금지법 위반에 따른 손해배상책임의 발생이라는 공통 쟁점을 압도하므로 집단소송 허가요건 중 지배성 요건을 흠결하였다는 취지이다. 공정거래법의 사적 집행의 강화는 우리나라 경쟁정책이 앞으로 나아가야 할 길로서, 위 컴캐스트 판결은 향후 우리나라에 미국식의 옵트-아웃 반독점 집단소송제가 도입될 경우, 이에 임하는 사인과 법조인들에게 일응의 가이드라인을 제공하여, 반독점 집단소송제가 당초의 도입 취지대로 남용 없이 올바르게 정착하는 데에 밑거름이 될 수 있을 것으로 보인다. 특히 반독점 집단소송의 허가요건에 관하여 별도의 입법을 하지 않고, 기존에 국회에 계류 중인 개정안과 같이 「증권관련 집단소송법」을 그대로 차용하게 될 경우, 미국 집단소송의 허가요건 중 지배성 요건에 상응하는 ‘중요쟁점의 공통성'을 요구하게 될 것으로 보이는데, 위 컴캐스트 판결은 향후 우리나라 반독점 집단소송의 ‘중요쟁점의 공통성' 요건 판단에 있어 구체적인 해석지침을 줄 수 있을 것으로 판단된다. 일반적인 손해배상소송과 달리, 반독점 손해배상소송에 있어 반경쟁적 행위와 인과관계 있는 손해액의 산정 문제는, 배상책임의 발생만큼이나 중요하고도 난해한 쟁점으로서, 만일 구성원 간 공통적인 손해액 산정방법을 적용할 수 없다면, 그 구성원 전체를 하나의 집단으로 소송절차를 진행해야 할 당위성이나 필요성이 있다고 보기 어렵기 때문이다. 이 글에서는 우선 일반적인 집단소송 허가요건의 구체적인 내용을 반독점 집단소송의 관점에서 살펴본 후 위 컴캐스트 판결의 주요 판시 내용과 이후의 동향, 우리나라에의 시사점을 차례로 검토하고자 한다.

      • 韓國 農業機械의 變遷 過程

        宋錫銀,朴魯奭 진주산업대학교 1968 論文集 Vol.2 No.-

        1.The mechanization of agriculture in Korea can not be achieved in a short period of time. 2.The agricultural machinery available in Korea is in process of being motorized from nam powered machinery 3.The mechanization of agriculture can reduce labour efficiency, increase yields, and modernize the farm villages.

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