PURPOSES : This study proposes a methodology to collect data necessary for microlevel emission estimation, such as second-by-second speeds and road grades, and to accordingly estimate emissions. METHODS: To ease data collection for microlevel emission estimation, a vehicle equipped with speed- and location-recording instruments as well as equipment for measuring road geometry was used. As a case study, this vehicle and the proposed methodology were used on a 10- km-long highway in Yongin City, Korea. Emissions from the vehicle during driving were estimated in various microscale driving conditions. RESULTS : Differences in the estimated emission under different microscale driving conditions cannot be ignored. Compared with the estimations obtained when second-by-second data were not considered, CO and NOx emissions were more than threefold higher when considering second-by-second speed; similarly, CO and NOx emission estimations were higher by approximately 10% and 3%, respectively, when considering second-by-second road grade. CONCLUSIONS : The proposed method can estimate vehicle emissions under real-world driving conditions in such applications as road design and traffic policy assessments.

본 발표에서는 고분자막의 열화(Degradation)원인과 열화 조건, 열화방지 방법, 고분자막 내구성 평가 방법 등에 대해서 논의하고자 한다. PEMFC 고분자 막의 열화원인은 전기화학적인 열화를 포함한 화학적인 열화와 물리적인 열화, 열에 의한 열화로 분류할 수 있다. 고분자 막이 전기화학적열화가 잘되는 조건은 OCV와 같은 높은 전압, 저 가습, 고온, 높은 수소/산소 압력 조건이다. 고분 자막의 내구성을 평가하기 위해서 열화 가속화 기법을 사용하는데, 전기화학적 내구성은 OCV holding 기법을, 물리적 내구성은 Wet/Dry 기법을 일반적으로 사용한다. 이들 내구성 평가 방법에 관한 미국의 DOE 프로토콜과 일본의 NEDO 프로토콜을 비교 검토한다.

국내 서해대교, 인천대교와 같은 장대교량은 대부분 빈번하게 태풍에 의해 영향을 받는 해안에 위치하였으며, 교량의 길이가 긴 만큼 풍하중에 의한 영향이 다른 하중에 비해 상대적으로 크기 때문에 내풍 안정성을 확보하기 위해 정확한 설계풍속을 산정하는 것이 매우 중요하다. 본 연구에서는 태풍의 기후학적 특성 인자로 중심기압깊이, 태풍이동속도, 태풍이동방향, 최단접근거리를 결정하였으며, 태풍의 기후학적 특성들의 확률 분포를 추정하고, 바람장 모형과 중심기압상승 모형을 적용하여 몬테카를로 시뮬레이션을 실시하였다. 분석결과, 대체적으로 제주도와 남해안 지역의 재현기간 풍속이 크게 나오며 고위도로 갈수록 작아지는 특징을 나타냈다. 이와 같은 특징이 나타난 가장 큰 원인은 고위도 분석지점 표본 태풍의 중심기압이 저위도 분석지점 표본 태풍의 중심기압보다 높기 때문으로 판단되며, 또한 우리나라에 해상에서 육지로 이동하면서 쇠퇴기를 겪어 점차 약해지기 때문인 것으로 분석되었다. 또한, 시뮬레이션 결과를 도로교 설계기준 100년 재현기간 풍속(10분 평균, 지상 10m, 지표조도 II)과 비교한 결과, 태풍시뮬레이션의 결과가 낮게 나타났으며, 이러한 점을 볼 때 도로교 설계기준의 기본 풍속이 높게 산정되어 있다고 판단되며, 기상자료 분석과 같은 추가적인 연구를 통해 기본풍속 조정에 대한 연구가 수행 되어야 할 것으로 사료된다.

최근 강풍으로 인한 옥외광고물의 파손 및 추락으로 인해 불특정 다수에게 인적 및 물적 피해를 야기하고 있다. 옥외광고물은 사유시설과 공공시설물의 성격을 모두 갖기 때문에 옥외광물로 인한 피해를 저감하는 것은 개인의 노력뿐 아니라 제도 및 규정을 통해서도 이루어져야한다. 이러한 피해는 강풍에 취약한 옥외광고물의 내풍설계 기준의 미비가 가장 큰 요인으로 인식되고 있어 본 연구에서는 옥외광고물의 내풍설계 표준을 제시하였다. 이를 위해 풍속에 영향을 주는 옥외광고물 설치위치의 주변 풍환경이나 높이, 설치위치 등 풍속과 관련한 요소를 반영하였으며, 건축구조기준 2015(안)의 기본풍속도와 풍속보정 절차에 의한 풍하중 산정 과정을 제시하였다. 이 과정에서 공학적 판단이 요구되는 옥외광고물 설치위치 주변의 지표조도구분 및 지형계수 평가에 대해 정략적으로 적용할 수 있는 기준을 제시하였다. 또한 비전문가 관점에서 적용하기 용이하도록 가능한 단순화된 정량화 절차를 제시하였다.

Displacement response of structure is valuable information for monitoring an structure integrity. However, measuring the displacement response is difficult than other structure responses, such as acceleration, strain, and angle. So, previous researches have focused on displacement estimation technique using measured acceleration. The displacement estimation methods also have weakness that filtering noise of measured data is so complicate. The estimated displacement might be diverged because of the measuring noise. Because of these reasons, this study focused on rotation angle. This study developed a algorithm for estimating displacement and structure deformed shape using rotation angle.

Suhyup Bank became to be subject to regulation of capital ratio by BaselⅢ which was introduced in order to enhance stability of the financial institution. Accordingly, Suhyup Bank will require recapitalization. It is important to estimate the risk-weighted assets in calculating of Suhyup Bank’s recapitalization scale. Therefor, this study aimed to present a scientific model as estimated the risk-weighted assets. Risk-weighted assets are calculated by applying different risk weights for loans, may have a certain relationship with the loans. Results show that the risk-weighted assets is affected by the previous year’s riskweighted assets and influenced the increase in loans during the year. Since the required basic capital adequacy ratio was specified, the risk-weighted assets should be predicted reasonably. Accordingly, on this study it was tried to derive the accounting equation to predict the risk-weighted assets based on management data of a bank since introduction of BaselⅢ. As the risk-weighted assets were weighted differently according to the type of loans, if the accounting equation is derived by using the type of loans, then it would be helpful for the risk management of banks in the long-term. According to this, the increase of loan would be predicted on the basis of past management performance of Suhyup Bank, and for this reason, the future risk-weighted assets of Suhyup Bank were predicted. The result of this study was showed that 98.3% of risk-weighted assets of the previous year, 62.4% of the secured loan changes and 95.1% of the credit loan changes affected risk-weighted assets.

Imcheong-gak[臨淸閣] was a familial residence constructed in the early half of the Joseon dynasty period. It was partially destroyed by a fire during the 1590s war[壬辰倭亂] with the Japanese, and another fire that was caused between 1631 and 1634. The inner chamber[An-chae] and the Sarang section[Sarang-chae] today is the result of a partial reconstruction that took place back in 1626 and again around 1634. The residence also went through some changes because the new Ondol[溫突] heating system had to be applied to the structure. Based upon sections that remain in their original forms, we can presume that the Imcheong-gak residence originally had an inner chamber which was composed of the following elements: A main structure which was built upon a foundation featuring a Matbae[맞배] roof, two “Ik’rang[翼廊, flank]” sections on the East and West sides of the inner chamber, and a “Haeng’rang[行廊, passage]” structure on the opposite side of the main structure. Unlike the main structure, other portions of the inner chamber were all built directly upon the ground, and showed multiple stories, with Matbae roofs of their own. We can also assume that the Sarang section in the south would have been a pre-Ondol[溫突] bedroom, with a Board platform[板房] and a Gomi-ceiling[Gomi-banza] fashion.

The house fly, Musca domestica L. is a serious cosmopolitan pest in livestock production systems. Poultry farmers employ various techniques to control them but rely heavily on the use of chemicals which has the serious drawback of the target pest becoming resistant. We have selected two native natural enemies in Gyeonggi area where selected for the biological control of the house fly. Carcinops pumilio (Erichson) (Coleoptera: Histeridae), commonly found in poultry manure, is an important predator of house fly eggs and larvae. The substitute food source was developed for the mass rearing of C. pumilio. Spalangia nigroaenea (Hymenoptera: Pteromalidae) not only parasitized the host to produce its progeny but also killed host pupae by feeding. The parasitoid induced mortality had an effect on the parasitoid-to-host density relationships.

PURPOSES : The aim of this study was to compare the performance of the QUEENSOD method and the gravity model in estimating Origin-Destination (O/D) tables for a large-sized microscopic traffic simulation network. METHODS : In this study, an expressway network was simulated using the microscopic traffic simulation model, VISSIM. The gravity model and QUEENSOD method were used to estimate the O/D pairs between internal and between external zones. RESULTS: After obtaining estimations of the O/D table by using both the gravity model and the QUEENSOD method, the value of the root mean square error (RMSE) for O/D pairs between internal zones were compared. For the gravity model and the QUEENSOD method, the RMSE obtained were 386.0 and 241.2, respectively. The O/D tables estimated using both methods were then entered into the VISSIM networks and calibrated with measured travel time. The resulting estimated travel times were then compared. For the gravity model and the QUEENSOD method, the estimated travel times showed 1.16% and 0.45% deviation from the surveyed travel time, respectively. CONCLUSIONS : In building a large-sized microscopic traffic simulation network, an O/D matrix is essential in order to produce reliable analysis results. When link counts from diverse ITS facilities are available, the QUEENSOD method outperforms the gravity model.

본 연구는 가상 질량 동조기(VMT)를 이용하여 구조물의 응답으로부터 구조물의 감쇠비를 구하는 기법을 다룬다. 백색잡음 뿐만아니라, 특정 진동수 가진, 충격하중 가진 등 다양한 하중종류 및 특성에 의하여 발생한 구조물의 계측응답에 대하여 VMT를 적 용하였을 때 구조물의 감쇠비를 추정하는 기법에 대해서 다루고, VMT의 동적특성이 구조물 감쇠비 추정에 미치는 영향을 수치적으로 분석하였다. 수치해석결과에 의하면, VMT에 의하여 구조물 감쇠비 추정이 충분한 신뢰성을 가지고 예측되는 것을 확인 할 수 있었다. 충격하중을 받는 응답을 이용하는 경우 VMT에 의하여 가장 안정적으로 구조물 감쇠비 추정이 가능한 것을 알 수 있었으며, 백색잡음, 협소대역 하중에 대해서도 VMT의 지정 감쇠비를 너무 작게 산정하지 않으면 감쇠비 추정이 가능한 것으로 나타났다. 정현파의 경우에는 가진 진동수의 VMT 비율을 이용하여 감쇠비 추정이 가능한데 고유진동수와 인접할수록 정밀도가 높아지는 것을 알 수 있었다.

Many organizations have transformed their business in order to survive and compete in the future. They generate projects by creating a vision, using strategies and objectives with funds aligning strategies and make efforts to complete them successfully because project success leads to business success. All projects have triple constraints such as scope, time, and cost to be completed. Project cost performance is a key factor to achieve project goals and which is mostly related with risks among various cost drivers. Projects require a cost estimation method to complete them within their budget and on time. An accurate budget cannot be estimated due to the uncertainties and risks. Thus some additional money should be funded in addition to the base budget as a contingency reserve for identified risks and a management reserve for unidentified risks. While research on contingency reserve for identified risks included in project budget baseline have been presented, research on management reserve for unidentified risks included in total project budget is still scarce. The lack of research on estimation method and role of the management reserve have made project managers little confidence to estimate project budget accurately with reasonable basis. This study proposes a practical model to estimate budgets including contingency and management reserves for not only project cost management but also to keep the balance of organization’s total funds to maximize return on investments for project portfolio management. The advantages of the proposed model are demonstrated by its application to construction projects in Korea and the processes to apply this model for verification are also provided.

사료이용 측면에서 유지 및 성장에 필요한 섭취량과 체내에 이용되지 않은 섭취량으로 구분할 수 있 으며, 체내에 이용되지 않은 섭취량을 잔류사료섭취량(Residual Feed Intake; RFI)이라 한다. 본 실험 은 국내 종돈의 RFI 유전모수를 추정하기 위해 2001년부터 2014년까지 태어난 Duroc종 8,696두의 검 정자료를 활용하였다. 일당증체량과 RFI의 육종가 상관관계는 -0.2로 음의 상관으로 조사되었는데 (P>0.01), RFI를 낮추면 일당증체량 개량에도 긍정적인 영향을 줄 수 있는 것으로 사료된다. 회귀추정 방식에 따른 RFI1(일당증체량)과 RFI2(일당증체량, 등지방두께)의 유전력은 각각 0.37, 0.45로 고도의 유전력을 나타내었다. 향후 국내에서도 개체단위 사료섭취량 측정으로 추정된 RFI를 개량에 활용한다면 농가 수익 개선에 많은 도움을 줄 수 있을 것으로 판단된다.

In this study, an acceleration sensor that has optical fibers to measure the inclination and acceleration of a structure through contradictory changes in two-component FBG sensors was examined. The proposed method was to ensure precise measurement through the unification of the deformation rate sensor and the angular displacement sensor. A high sensitivity three-axis accelerometer was designed and prepared using this method. To verify the accuracy of the accelerometer, the change in wavelength according to temperature and tension was tested. Then, the change in wavelength of the prepared accelerometer according to the sensor angle, and that of the sensor according to the change in ambient temperature were measured. According to the test results on the FBG-based vibration sensor that was developed using a high-speed vibrator, the range in measurement was 0.7 g or more, wavelength sensitivity, 2150 pm/g or more, and the change in wavelength change, 9.5 pm/℃.

Owing to time and cost constraints, new methods that would make it possible to evaluate the safety of the water supply pipeline in a less time- and cost-consuming manner are urgently needed. In response to this exigency, the present study developed a new statistical model to assess the safety of the water supply pipeline using the quantification theory type Ⅱ. In this research, the safety of the water supply pipeline was defined as ‘a possibility of the pipeline failure’. Quantification analysis was conducted on the qualitative data, such as pipe material, coating, and buried condition. The results of analyses demonstrate that the hit ratio of the quantification function amounted to 77.8% of hit ratio, which was a fair value. In addition, all variables that were included in the quantification function were logically valid and demonstrated statistically significant. According to the results derived from the application of the safety evaluation model, the coefficient of determination (R2) between K-region’s water supply pipeline safety and the safety inspection amounted to 0.80. Therefore, these findings provide meaningful insight for the measured values in real applications of the model. The results of the present study can also be meaningfully used in further research on safety evaluation of pipelines, establishing of renewal prioritization, as well as asset management planning of the water supply infrastructure.

On account of the increase in water demand and climate change, droughts are in great concern for water resources planning and management. In this study, rainfall characteristics with stationary and non-stationary perspectives were analyzed using Weibull distribution model with 40-year records of annual minimum rainfall depth collected in major cities of Korea. As a result, the non-stationary minimum probable rainfall was expected to decrease, compared with the stationary probable rainfall. The reliability of ξ1, a variable reflecting the decrease of the minimum rainfall depth due to climate change, in Wonju, Daegu, and Busan was over 90%, indicating the probability that the minimal rainfall depths in those city decrease is high.

The old house at No’eun-ri, located in Hongseong-gun Hongbuk-myeon of the Chungcheong Nam-do province, really seems like the old house of late Seong Sam-mun who died in 1456. The original structure of the house seems to have been symmetrical, in terms of its left and right sides, and the females’ chamber(Anchae) as well as the guest quarters(Haeng’rang-chae) would have featured a Matbae(맞배) fashion. The flank chamber and corridor would have displayed a multi-storied shape, and people would have been able to traverse the inside of the house all the way to the second story of the residence. We can see such shapes and dispositions from other ‘口’-shaped houses — found in Chungnam and Gyeongbuk regions — which are now considered as distinct characteristics of certain residences constructed before the war with the Japanese in the 1590s, confirmed from extant vestiges and historical records of that time period. It can be concluded that the old house at No’eun-ri does harbor the traits and elements that resembled the upper class residences of the Joseon dynasty’s early half period.