• 한국주거학회논문집
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• 제14권6호
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• pp.15-22
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• 2003

The regeneration of built-up areas is considered as one of the necessary measures for the effectiveness of urban growth management. In this vein, this study explores how to limit the number of people who leaves the built-up areas and to restore the area with the resident. For this, a residential area of the built-up area is analyzed in terms of why people in that area are moving out of the area and who fills in it after all. This study founds that narrow roads in a residential area and the changes in land use from residential purposes to commercial are major forces that push the people in the built-up area. In addition, the lack of welfare facilities, the pavement of roads, and pedestrian roads. education. crime. the lack of interaction between neighbors, and the quality of housing are all emerged contributing the loss of people in the built-up areas. It is recommended that all the factors here should be restored in an appropriate way. Another finding is that those who fill in the built-up area are largely over 50, self-employed, comparably wealthy, and having their own families. Hence, it is advised that the built-up area would be rearranged in order to attract those type of people in there.

• 한국융합학회논문지
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• 제9권2호
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• pp.341-347
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• 2018

본 연구의 목적은 4가지 자세의 푸시업 플러스(PUP) 운동 시 5번째와 7번째의 앞톱니근(SA), 위등세모근(UT), 중간등세모근(MT), 아래등세모근(LT), 큰가슴근(PM)의 근활성도를 알아보는 것이다. 25명의 대상자가 다양한 자세의 PUP 융합 운동 (일반자세, $90^{\circ}$, $120^{\circ}$, BOSU)을 실시하였다. 각 근육의 근활성도를 비교하기 위하여 반복 측정된 분산분석을 적용하였다. 다양한 PUP 융합 운동동안 SA7, PM, UT, MT에서 유의한 차이가 있었다(p <.05). SA7은 PUP 와 $90^{\circ}PUP$, BOSUPUP에서 각각 유의한 차이가 나타났다(p <.05). PM은 $90^{\circ}PUP$와 PUP, BOSUPUP에서 각각 유의한 차이가 나타났다(p <.05). UT은 $90^{\circ}PUP$와 PUP, BOSUPUP에서 각각 유의한 차이가 나타났다 (p <.05). MT는 $90^{\circ}PUP$와 PUP, $120^{\circ}PUP$, 그리고 PUP와 $120^{\circ}PUP$에서 유의한 차이가 있었다(p <.05). 본 연구 결과, 어깨의 기능부전이 없는 대상자가 어깨 안정근을 훈련할 때 일반적인 PUP가 효과적일 것이다.

• 한국산학기술학회논문지
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• 제18권9호
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• pp.454-463
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• 2017

과학의 발전과 함께 미디어 매체 또한 발전하였고, 이를 활용한 여러 분야 중 선거를 위한 홍보 전략 역시 점차 진화하였다. 미디어가 발달함에 따라 커뮤니케이션이 더욱 부각되어가고 있는 현재, 유권자들은 스마트 디바이스 어플리케이션을 활용하여 원활한 소통을 바탕으로 유권자들에게 더욱 적극적으로 다가가려 하고 있는 추세이다. 본 연구에서는 변화하는 선거 현장에 맞추고, 체계적으로 선거 활동을 지원할 수 있는 구글의 FCM 푸시 서비스를 기반으로 정보 시스템을 개발하고 적용하여 시스템이 영향을 주는 변수가 무엇인지 실증분석을 통하여 선거 과정의 목표를 달성하는 것에 도움이 되고자 한다. 후보자 소통 유도 푸시 어플리케이션의 전체 시스템은 유권자 어플리케이션과 관리 시스템으로 구성된다. 관리 시스템은 메시지 전송 이력 열람과 메시지 관리, 어플리케이션의 직접 관리 기능을 포함한다. 이 시스템을 통해 기존의 방법들보다 더욱 진보된 기법을 활용한 푸시 시스템으로 어플리케이션을 관리할 수 있어 선거 홍보 효율성 향상에 기여 및 선거 목표달성에 도움을 줄 것으로 사료된다.

• 대한기계학회논문집B
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• 제41권4호
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• pp.277-283
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• 2017

본 연구에서는 높이에 따른 점프 전략 변화를 이해하기 위해 반동을 이용한 수직 점프 시 상변화 시점에서의 지면반력 벡터가 높이에 따라 어떻게 변하는지 분석하였다; 반동과 추진 구간에서 유사한 힘 작용선을 갖는 수직 점프의 경우, 상변화 시점에서 반동의 이득을 나타내는 합력 벡터의 크기와 방향이 일정한 경향성을 가지고 높이에 따라 변화할 것이라 가정하였다. 9명의 청년군 모두는 정해진 5 종류의 높이를 총 5세트에 걸쳐 랜덤 방식으로 점프하였으며, 해당 높이를 유도하기 위해 지면으로부터 191 cm에서 221 cm 사이에 일정한 간격을 두고 마커를 배치하였다. 점프 높이가 증가함에 따라 반동 시 무게중심을 낮추고, 수평, 수직 방향의 힘을 증가시키는 것이 관찰되었는데, 이는 추진일을 증가시키기 위해 관절의 가용범위를 넓히고 초기 힘(또는 가속도) 이득을 늘리기 때문으로 생각된다.

• Steel and Composite Structures
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• 제25권1호
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• pp.79-92
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• 2017

Initial damage to a stud due to corrosion, fatigue, unexpected overloading, a weld defect or other factors could degrade the shear capacity of the stud. Based on typical push-out tests, a FEM model and theoretical formulations were proposed in this study. Six specimens with the same geometric dimensions were tested to investigate the effect of the damage degree and location on the static behavior and shear capacity of stud shear connectors. The test results indicated that a reduction of up to 36.6% and 62.9% of the section area of the shank could result in a dropping rate of 7.9% and 57.2%, respectively, compared to the standard specimen shear capacity. Numerical analysis was performed to simulate the push-out test and validated against test results. A parametrical study was performed to further investigate the damage degree and location on the shear capacity of studs based on the proposed numerical model. It was demonstrated that the shear capacity was not sensitive to the damage degree when the damage section was located at 0.5d, where d is the shank diameter, from the stud root, even if the stud had a significant reduction in area. Finally, a theoretical formula with a reduction factor K was proposed to consider the reduction of the shear capacity due to the presence of initial damage. Calculating K was accomplished in two ways: a linear relationship and a square relationship with the damage degree corresponding to the shear capacity dominated by the section area and the nominal diameter of the damaged stud. This coefficient was applied using Eurocode 4, AASHTO LRFD (2014) and GB50017-2003 (2003) and compared with the test results found in the literature. It was found that the proposed method produced good predictions of the shear capacity of stud shear connectors with initial damage.

• 대한견주관절학회:학술대회논문집
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• 대한견주관절학회 2007년도 제15차 대한견주관절학회 및 제3차 Mayo Asia Elbow Club 합동 학술대회
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• pp.9-10
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• 2007

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 G
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• pp.3129-3131
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• 1999

The electronic ballast for MHD lamp was studied for automotive headlight application. Its basic principle is the Current Sourcing Push-Pull Resonant Inverter with DC I2Volt input Voltage. By changing the switching frequency according to the lamp state, the automotive requirement of very fast warm-up and the zero voltage switching condition were shown by the simulation of the ballast circuit.

• Journal of Information Processing Systems
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• 제9권1호
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• pp.157-172
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• 2013

There are many recommendation systems available to provide users with personalized services. Among them, the most frequently used in electronic commerce is 'collaborative filtering', which is a technique that provides a process of filtering customer information for the preparation of profiles and making recommendations of products that are expected to be preferred by other users, based on such information profiles. Collaborative filtering systems, however, have in their nature both technical issues such as sparsity, scalability, and transparency, as well as security issues in the collection of the information that becomes the basis for preparation of the profiles. In this paper, we suggest a movie recommendation system, based on the selection of optimal personal propensity variables and the utilization of a secure collaborating filtering system, in order to provide a solution to such sparsity and scalability issues. At the same time, we adopt 'push attack' principles to deal with the security vulnerability of collaborative filtering systems. Furthermore, we assess the system's applicability by using the open database MovieLens, and present a personal propensity framework for improvement in the performance of recommender systems. We successfully come up with a movie recommendation system through the selection of optimal personalization factors and the embodiment of a safe collaborative filtering system.

• Earthquakes and Structures
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• 제12권5호
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• pp.529-541
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• 2017

According to the definition, progressive collapse could occur due to the initial partial failure of the structural members which by spreading to the adjacent members, could result in partial or overall collapse of the structure. Up to now, most researchers have investigated the progressive collapse due to explosion, fire or impact loads. But new research has shown that the seismic load could also be a factor for initiation of the progressive collapse. In this research, the progressive collapse capacity for the 5 and 15-story steel special moment resisting frames using push-down nonlinear static analysis, and nonlinear dynamic analysis under the gravity loads specified in the GSA Guidelines, were studied. After identifying the critical members, in order to investigate the seismic progressive collapse, the 5-story steel special moment resisting frame was analyzed by the nonlinear time history analysis under the effect of earthquakes with different characteristics. In order to account for the initial damage, one of the critical columns was weakened at the initiation of the earthquake or its Peak Ground Acceleration (PGA). The results of progressive collapse analyses showed that the potential of progressive collapse is considerably dependent upon location of the removed column and the number of stories, also the results of seismic progressive collapse showed that the dynamic response of column removal under the seismic load is completely dependent on earthquake characteristics like Arias intensity, PGA and earthquake frequency contents.

• Advances in concrete construction
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• 제1권4호
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• pp.273-288
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• 2013

The main objective of this research was to evaluate the potentials of self-compacting concrete (SCC) mixes to develop bond strength. The investigated mixes incorporated relatively high contents of dolomite powder replacing Portland cement. Either silica fume or fly ash was used along with the dolomite powder in some mixes. Seven mixes were proportioned and cast without vibration in long beams with 10 mm and 16 mm steel dowels fixed vertically along the flowing path. The beams were then broken into discrete test specimens. A push-put configuration was adopted for conducting the bond test. The variation of the ultimate bond strength along the flowing path for the different mixes was evaluated. The steel-concrete bond adequacy was evaluated based on normalized bond strength. The results showed that the bond strength was reduced due to Portland cement replacement with dolomite powder. The addition of either silica fume or fly ash positively hindered further degradation as the dolomite powder content increased. However, all SCC mixes containing up to 30% dolomite powder still yielded bond strengths that were adequate for design purpose. The test results demonstrated inconsistent normalized bond strength in the case of the larger diameter compared to the smaller one.