본 연구에서는 연 최저 유입량과 연 최대 부족량 자료를 이용하여 수문학적 가뭄을 평가하였고, 수자원 시설의 계획 및 관리에 이용할 수 있도록 물 부족량-지속기간-빈도 곡선을 제안하였다. 연 최저 유입량 분석결과, 대부분의 지속기간에서 1989년, 1996년 수문학적 가뭄의 재현기간이 가장 길었다. 연 최대 부족량 분석결과, 비교적 짧은 지속기간인 60일, 90일 부족량의 재현기간은 1982년에서 약 35년으로 가장 길게 나타났으며, 길게 지속되었던 수문학적 가뭄은 1995년으로 재현기간은 약 20년이었다. 가뭄은 크기와 함께 지속기간도 주요한 변수이지만 연 최저 유입량을 이용한 방법은 지속기간을 구분하지 못한다는 단점이 확인되었다.

수공구조물을 설계함에 있어 설계우량주상도를 결정하기 위해 설계강우량을 시간분포시키는 방법은 매우 중요하다. 우리나라에서 널리 쓰이는 Huff 방법의 경우 MOCT(2000), MOLTMA (2011)에서 적용성을 높여왔으나, 기존 Huff (1967) 방법과 똑같은 기각기준으로 강우총량 1 inch (25.4mm)를 제시하고 있다. 따라서 본 연구에서는 Huff 방법 적용시 자료 기각기준을 집중호우기준에 따라 극치사상만을 분석하는 시간분포방법을 제안하였고, 이를 실제유역에 적용시켜 강우-유출모형을 통한 검증을 실시하였으며 목적함수 비교를 통해 실제유역의 적용성을 확인하였다. 그 결과 첨두유출량의 과소산정 문제를 보완하여 실제 첨두유출량에 더 가까운 유출수문곡선을 제시함으로써 수공구조물 설계의 안정성을 높일 수 있을 것으로 판단된다.

Generator’s direct weighing method was applied for investigation of household waste generation. At least 28 days, eachhousehold member measured and recorded the weight of garbage discharged with plastic garbage bag, food waste, andrecyclable waste. Collected garbage record books were used as input data in Microsoft Excel, and statistical analysis weredone with Minitab 16 software. By generator’s direct weighing method for household waste generation, garbage dischargedby plastic bag, food waste, and recyclable waste were 130.5, 98.2, and 187.9g/capita/day, respectively. Difference inaverages of per capita garbage discharge between Seoul, Gyeonggi, Incheon, and Chungbuk were no statisticallysignificant. And as the number of house member decrease, per capita garbage discharge increase numerically, but therewas no statistically significant.

본 연구는 소아 심장 전산화단층촬영 검사에서 조영제의 과다 사용을 최소화하며 피폭 선량 저감화를 목적으로 조영제의 주입속도 및 심장 도달 시간 등의 변수를 고려한 스캔 지연 시간을 경험론적 방법으로 수식화함으로써 4개의 심방과 심실이 동시 조영증강 영상을 획득할 수 있는 최적화 방안을 제시하고자 하였다. 소아 심장전산화단층 검사를 시행한 소아 환자 30명을 대상으로 정성적 평가, 정량적 평가, 선량평가를 실시하였다. 결론적으로 본 연구에서 개발한 체중에 따른 조영제 양과 주입속도에 따른 스캔 지연 시간을 계산하는 경험론적 방법을 적용함으로써 왼 오른 심방과 심실의 동시 조영증강에서 소아 심장 판독에 적합한 300 HU 값 이상으로 나타났고 명확성, 선예도, 노이즈에 대한 정성적 영상 평가에서 질적 우수성을 보였으며 선량평가에서도 소아가 받는 피폭선량도 명확하게 감소되었다. 따라서 본 연구는 임상에서 조영제 과다 사용으로 인한 부작용 감소 효과를 기대 할 수 있었으며 방사선 피폭 저감화를 기대 할 수 있는 이점을 가지고 최적의 영상을 만드는데 중요한 역할을 할 것으로 판단되었다.

최근 First Person Shooter (FPS) 게임 시장에서 ‘플래닛 사이드 2’ 를 비롯한 대규모 온라인 FPS (MMOFPS: Massively Multi-player Online FPS) 장르가 주목받고 있다. 수백 또는 수천 명이 접속하는 게임 서버에서 네트워크 부하를 경감시키기 위해서 널리 사용되는 방법 중 하나 는 데드레커닝이다. 본 논문에서는 MMOFPS 게임을 위한 데드레커닝 구현 시 주요 캐릭터 상 태 갱신 변수 중 하나인 방향에 대하여 효율적으로 허용 임계각을 계산하는 수학적 방법을 제 안한다. 제안하는 방법은 게임사용자들을 대상으로 하는 수행 실험을 통해 움직임 오차를 최소 화하며 자유스러운 방향 갱신에 대한 효율성을 검증 하였다

This study is to introduce the results of physical property test on the polyurea ultra rapid curing membrane according to the test method by the KS F 2622

Ground liquefaction of sandy ground during earthquake is a major problem that may cause big catastrophes to infrastructures. In seismic evaluation, it is important to describe correctly the mechanical behavior of soils subjected to cyclic loading in order to avoid or reduce the damages caused by liquefaction. However it needs a lot of time and efforts. Therefore in this study, we tried to evaluate the elaborate way for ground liquefaction hazard map using a simple method for estimating.

This study is about an earthquake disaster response system and an application technology for post-earthquake safety evaluation. The mobile application supports field survey on earthquake damage buildings and shortens the surveying time. The results from the mobile are transmitted to a data managing program. And it displays a surveyed-place, result and suggests statics. This system is expected to support local governments to effectively respond to earthquake disasters.

Through The Japanese case that they prevent earthquake damage by using seismic design, we design a building that before reform seismic design and conduct a seismic design evaluation. For detail evaluation, we use Nonlinear Static Analysis and find performance point that using by Capacity Spectrum Method of procedure B and Displacement Coefficient Method. We compared performance point of Capacity Spectrum Method of procedure B and target displacement of using Displacement Coefficient Method. Consequently we obtain a result that those are similar. Result of understanding each element performance level that base on performance point, some elements are unsatisfactory. Thus, We have come to conclusion that re-evaluate after reinforce structure.

Linear and nonlinear models are available to simulate the effect of mine blasting. And the results are changed by selection of each model. Plaxis 8.0, FLAC 4.0 are used in this study for simulating blasting pressure. These programs offer linear model and nonlinear model. Linear model can properly simulate loss of impact wave in plastic failure region based on comparison of site vibration measurement and numerical analysis iteratively.

The purpose of this study is to use organisms or micro-organism functions for eco-friendly water-purification according to concentration in porous concrete using EM, utilizing bioremediation.

This study aims to apply multistage homotopy perturbation method (MHPM) to SDOF space truss to obtain a semi-analytical solution. For the purpose, a nonlinear governing equation is derived in consideration of geometrical nonlinearity, and homotopy equation is formulated. The result of carrying out dynamic analysis on a simple model is compared to a numerical method of 4th order Runge-Kutta method (RK4), and the dynamic response by MHPM concurs with the numerical result.

Vertical pipe cooling method was developed for the thermal cracking control of vertically long and slender mass concrete member. This method was applied to mass concrete wall, and the performance of this method was investigated.

The purpose of this study is to more accurately predict the compressive strength of concrete according to mixing proportion using UPV(Ultrasonic Pulse Velocity) method. The equation to predict the compressive strength of concrete is proposed based on the results of UPV method.

Although accelerators can be utilized for the prevention of early frost by developing the strength of concrete in cold weather, no security of workability occurs because early hydration makes them react rapidly. In this study, granulation was used as a method as it can control the response time of the accelerator to secure the workability of fresh concrete.

The purpose of this study is to establish a mathematical equation to evaluate the compressive strength of concrete from the measured impact resonance test values(Ed). The correlation was made between the measured and evaluated compressive strength values and the correlation was quite strong.

For the corner joint strengthening of the underground box structures, the strengthening method using pressure members was developed. By the applied pressure on the reinforcing members and the increase of nominal strength due to reinforcing member, the size of the reinforcing members are reduced and the performance of corner joint strengthening is improved.

Recently, it is established to Limit State Design(LSD) method such as Eurocode, AASHTO LRFD, KBDC(LSD)2012 which is a design criteria of reliability-based according to the international standards. But it requires sufficient reviews of the bridge assessment method applied to this LSD method because current assessment methods are ASD and USD. In this study, in order to be compared with a previous diagnosis data and utilize to assessment methods studies based on the LSD, we have proposed the introduction of the way to improve the existing evaluation procedures.

Failures of curved bridge have been occurred due to the negative reactions in construction and in survice and this problem has been issued in our society. In this study, the strengthening method of curved bridge which was occured negative reactions was investigated through the structural stability analysis.

Depending on the speed up of railway noise problem has become increasingly serious. In general, under the same conditions when the vehicle speed is 300km/h in a 400km/h increases, it is known that an increase in the noise level of 6 to 7dB. Railway Noise can be reduced by improving the vehicle and the track system. Also, the noise barrier and sound absorbing block may be a valid alternative to reduce railway noise. Here we propose a construction method of absorbing blocks are removable to allow maintenance.