• Archives of Plastic Surgery
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• 제40권1호
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• pp.28-35
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• 2013

Background If a chronically infected abdominal wound develops, complications such as peritonitis and an abdominal wall defect could occur. This could prolong the patient's hospital stay and increase the possibility of re-operation or another infection as well. For this reason, a solution for infection control is necessary. In this study, surgery using a rectus abdominis muscle myofascial splitting flap was performed on an abdominal wall defect. Methods From 2009 to 2012, 5 patients who underwent surgery due to ovarian rupture, cesarean section, or uterine myoma were chosen. In each case, during the first week after operation, the wound showed signs of infection. Surgery was chosen because the wounds did not resolve with dressing. Debridement was performed along the previous operation wound and dissection of the skin was performed to separate the skin and subcutaneous tissue from the attenuated rectus muscle and Scarpa's fascial layers. Once the anterior rectus sheath and muscle were adequately mobilized, the fascia and muscle flap were advanced medially so that the skin defect could be covered for reconstruction. Results Upon 3-week follow-up after a rectus abdominis myofascial splitting flap operation, no major complication occurred. In addition, all of the patients showed satisfaction in terms of function and esthetics at 3 to 6 months post-surgery. Conclusions Using a rectus abdominis myofascial splitting flap has many esthetic and functional benefits over previous methods of abdominal defect treatment, and notably, it enabled infection control by reconstruction using muscle.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2003년도 The Fifth Asian Computational Fluid Dynamics Conference
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• pp.189-190
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• 2003

A New kinetic scheme for the compressible Navier-Stokes equations is developed. While the conventional approach, such as KFVS scheme, employs the splitting algorithm and computes the numerical flux on the basis of the collisionless equation, the present approach employs the splitting algorithm in the evaluation of the numerical flux, where the collision effect is explicitly taken into account. However, the initial condition employed in the computation is slightly different from the conventional Chapman-Enskog NS distribution function. The present study also reveals the background of the existing kinetic schemes. such as the KFVS scheme and Gas-Kinetic BGK scheme.

• Management Science and Financial Engineering
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• 제17권2호
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• pp.23-37
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• 2011

In this paper, we address a layout design problem for determining an optimal 4-class-based dedicated linear storage layout in a class of unit load storage systems. Assuming that space requirement for a class is the sum of the maximum inventory levels of products assigned to the class, and that one-way travel time is a linear function of storage index, we formulate a 4-class-based dedicated linear storage problem PTL[4] and provide an exact splitting algorithm with $O(n{\lceil}logn{\rceil})$. Our algorithms could be applied to more than a 4-class-based dedicated storage layout problem with slight modification in order to reduce computational execution time.

• 응용통계연구
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• 제18권3호
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• pp.661-671
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• 2005

본 연구는 반복분할(recursive partitioning)에 의한 군집화 방법을 개발하고 활용 예를 보인다. 노드 분리 기준으로는 Overall R-Square를 채택하였고 실용적인 노드 분리 결정 방법을 제안하였다. 이 방법은 연속형 자료에 대하여 나무 형태의 해석하기 쉬운 단순한 규칙을 제공하면서 동시에 변수선택기능을 제공한다. 환용 예로서 Fisher의 붓꽃데이터와 Telecom 사례에 적용해 보았다. K-평균 군집화와 다른 몇 가지 사항이 관측되었다.

• 환경생물
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• 제23권1호
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• pp.52-56
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• 2005

8일간 생장한 보리 유식물에 72시간 동안 dimethipin을 처리하면서 엽록소 함량의 변화와 광합성적 전자전달 활성을 측정하였다. 10/sup -3/M dimethipin을 72시간 처리한 경우 엽록소 함량이 33% 감소하였다. 이에 비해 7일간 암소에서 생장시킨 후 dimethipin을 처리한 보리 유식물은 녹화 48시간에 10/sup -4/M에서 대조구에 비해 43% 엽록소 함량이 감소하였으며, 엽록소 a/b 비율이 증가하였다. 24시간의 dimethipin처리는 PSⅡ+PSⅠ활성에 거의 영향을 미치지 않았다. 10/sup -4/M dimethipin처리는 48시간 배양시 10% 그리고 72시간에는 25%의 PSⅡ+PSⅠ 활성을 억제하였다. Water splitting system을 제외한 PSⅡ+PSⅠ 활성은 10/sup -4/M dimethipin을 48시간 처리할 경우 16% 그리고 72시간에는 27% 억제되었다. 10/sup -4/M dimethipin을 24시간 처리할 경우 PSⅡ활성은 8%, 48시간에서는 13% 그리고 72시간에서는 18% 억제되었다. 10/sup -4/M dimethipin을 24시간 처리할 경우 PSⅠ활성은 4%, 48시간에서는 8% 그리고 72시간에서는 10% 억제되었다. 7일간 암소에서 자란 황백화된 보리 유식물을 녹화시간 6, 12, 24와 48시간에 dimethipin을 처리할 경우 PSⅡ+PSⅠ 활성은 5, 10, 10 그리고 11% 억제되었다. 반면에 water splitting system을 제외한 PSⅡ+PSⅠ 활성은 모든 처리시간에서 그 효과가 없었다. 또한 PSⅡ와 PSⅠ의 활성도 대조구와 큰 차이가 없었다. 이와 같이 dimethipin에 의해 야기된 광합성적 전자전달활성의 억제는 엽록체 합성과정에서의 영향보다는 엽록체의 기능에 영향을 주는 것으로 사료되며, 이러한 엽록체 기능의 감소는 dimethipin에 의해 야기되는 30∼40%의 엽록소 함량감소에 의한 것으로 사료된다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1994년도 가을 학술발표회 논문집
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• pp.223-228
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• 1994

The strength development of polymer concrete using an unsaturated polyester polymer varies depending on many factors. However, the strength development is mostly dependent upon the age and curing temperature if the mixture ratios are the same. This study conducted to experimentally describe the relationship between the strength development and maturity which is defined as a function of $\Sigma$(time $\times$ temperature). The research result may be applied to predict the compressive, tensile and splitting strengths of the polymer concrete by computing the maturinty of the concrete.

• Bulletin of the Korean Chemical Society
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• 제6권4호
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• pp.183-186
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• 1985

The lattice vibrational calculation of orthorhombic hydrogen chloride is performed using physically realistic potential function which can reproduce the X-ray structure and heat of sublimation of the low temperature phase. The polar coordinates representation is introduced in order to describe the intermolecular interactions in a molecular crystal. The splitting in internal modes is calculated as 49 $cm^{-1}$ and the other modes are in good agreement with experimental results.

• 한국해안해양공학회지
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• 제17권1호
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• pp.21-31
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• 2005

본 연구에서 Nwogu(1993)의 확장형 Boussinesq 방정식에 대하여 한 격자의 조파 띠에 균일하게 분포하는 원천함수를 유도하였다. 원천함수를 포함하는 확장형 Boussinesq 방정식에 부분단계분리법을 적용하여, 에너지 전송속도를 사용하는 선 조파기법의 타당성을 해석적으로 증명하였다. 수평공간 1차원의 경우 선형파 뿐만 아니라 비선형파를 조파하여 원천함수기법에 의한 내부조파기법의 정확성을 검증하였다. 또한 원천함수기법에 의한 수치 결과가 선 내부조파기법에 의한 수치 결과와 동일함을 확인하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권6호
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• pp.2686-2708
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• 2020

This paper investigates the energy efficiency of energy harvesting (EH) bidirectional cooperative sensor networks, in which the considered system model enables the uplink information transmission from the sensor (SN) to access point (AP) and the energy supply for the amplify-and-forward (AF) relay and SN using power-splitting (PS) or time-switching (TS) protocol. Considering the minimum EH activation constraint and quality of service (QoS) requirement, energy efficiency is maximized by jointly optimizing the resource division ratio and transmission power. To cope with the non-convexity of the optimizations, we propose the low complexity iterative algorithm based on fractional programming and alternative search method (FAS). The key idea of the proposed algorithm first transforms the objective function into the parameterized polynomial subtractive form. Then we decompose the optimization into two convex sub-problems, which can be solved by conventional convex programming. Simulation results validate that the proposed schemes have better output performance and the iterative algorithm has a fast convergence rate.

• 대한건축학회연합논문집
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• 제21권3호
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• pp.87-92
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• 2019

To relieve noise between floors in Korea, recent domestic and overseas studies have been developing materials that have the properties of ceramic, which is an inorganic compound, and polymer, which is an organic compound, to introduce a new function to polymer. This study conducted a bending strength experiment between re-bar and new composite concrete mixing POSS (Polyhedral Oligomeric Silses-quioxanes) nano complex on the inside of concrete, and by assembling the inside of each concrete with 3 and 4 main re-bars as an experiment to supplement various problems that occur by the expression of this strength and the distribution of the reinforcement. The number of the main re-bars. and the direction of laying the concrete were applied as the principal variables of the experiment. Upon experiment, there were no differences in the bond strength based on the location of the main re-bar, and a 2 % increase in the bond strength was shown in the specimen laid in the same direction as the main re-bar in comparison to that of the specimen laid in a different direction from the main re-bar. The experiment results displayed that the composite concrete had uniform performance based on the rapid reaction speed of POSS nano complex.