• 대한건축학회논문집:계획계
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• 제35권4호
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• pp.37-44
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• 2019

According to the statistical surveys and studies, insufficient maintenance in the use of existing buildings caused fire and collapse accidents. In this respect, I analyzed the data managed by the current building maintenance and inspection system to find out the actual state of safety management and proposed two significant results. First, regarding the state of the buildings, the safety management status of the small-sized ones, where 20 years or more passed after construction, is the worst and a priority improvement plan is required. Second, there are eight deeply concerning factors for the fire incidents and collapse accidents of buildings. In the order of high risk, these factors are structural strength (seismic design), exterior wall finishing material, basement floor, interior finishing materials, other evacuation facilities, corridors stairs entrances, rooftop, fire partition. We need to have more special designs and management plans regarding high-risk factors as a system to prevent accidents in the building.

• 헤리티지:역사와 과학
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• 제47권1호
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• pp.102-115
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• 2014

판축법은 판으로 틀을 만들어 그 안에 흙이나 모래 등을 층층이 부어 다짐 방망이 등으로 찧어서 단단하게 쌓아 올리는 대표적인 고대 토목기법으로, 토성이나 건물 기단, 담장과 같은 시설을 축조하는 데 가장 보편적으로 이용되어 왔다. 이글의 목적은 풍납토성 축조에 이용된 다양한 기술의 분석을 통해 우리나라 판축토성의 축조 방법과 원리를 이해하는 데 있다. 토성을 축조하기 위해서는 먼저 정지작업을 실시하고 기초를 단단히 조성해야 한다. 점성이 강한 흙을 깔아 기저부를 형성하는데, 구덩이를 파고 다시 메꾸어서 기초를 다지는 기조의 원리가 이용된다. 때로는 지정목을 박거나 잡석을 깔아 기초를 다지기도 한다. 풍납토성은 중심토루의 안팎으로 여러 겹의 판괴를 비스듬하게 연접하여 축조한 것이 특징이다. 비록 고정주와 협판, 달구질 흔적 등의 뚜렷한 판축의 증거는 발견되지 않았지만 판축틀의 일부로 추정되는 목재가 결구된 상태로 발견되기도 하였다. 이 층에서는 판괴 내의 결합력을 높이고 수분을 유지하여 지내력을 증강시키기 위한 부엽층도 확인되었다. 중심토루 외벽에서는 역경사 판축법을 이용한 호성파도 관찰된다. 이밖에 성벽 축조를 마무리하면서 부석과 석축으로 전체 성벽의 유실 방지와 방수, 배수 등의 효과를 꾀하였다. 습기를 통제하거나 판축토 내의 수분을 제거하기 위한 목적으로 불다짐하기도 하였다. 아직까지 우리나라 고대 토성에서 판축의 정형을 찾았다고는 말할 수 없다. 그러나 풍납토성 등에서 확인된 판축의 증거들을 향후 발굴될 여러 유적들과 면밀히 비교 연구해 나가면 판축토성의 축조 방법과 원리를 밝히는데 큰 진전이 있을 것으로 기대한다.

• KIEAE Journal
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• 제17권2호
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• pp.5-12
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• 2017

Purpose: Under the purpose of presenting the adequate remodeling period for the improvement of thermal insulation performance of external walls in deteriorated buildings, the change in external wall and residential environment problem(dew condensation) due to aged deterioration after the apartments were constructed in Korea were analyzed. Method: Temperature Difference Ratio Outside(TDRo) and Heat Flow Meter(HFM) were used as measurement methods to evaluate the thermal insulation performance of deteriorated buildings. For TDR evaluation, thermo-graphic camera was used to measure and analyze the surface temperature of external wall. Also, dew condensation evaluation was analyzed using the Temperature Difference Ratio Inside(TDRi). Result: As a result of analyzing thermal performance through TDRo, the first decline point of thermal insulation performance began after 14-16 years have passed since construction was completed, and after 20 years have passed the decline point of thermal insulation performance reappeared. As a result of analyzing U-value with HFM measurement method, the decline rate of external wall's thermal insulation performance is lower than 2% in average at around 5 years after completion, and 8.7% in average at 10-15 years, and over 10.2% in average at 20 years.

• 한국안전학회지
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• 제5권2호
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• pp.6-16
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• 1990

In this paper, the natural convection in a square enclosure, partly heated from below, with two adiabatic vertical wall and one upper horigental wall is studied nomerically. In numerical study, SIMPLE(Semi-Implicit for Pressure Linked Equation) algorithems are applied for the integration of momentum and energy equation. The grid size used in this study is the coordinates of size (22$\times$22). As a result of numerical analysis, the initial fluid flow depends on the thermal diffusion, but, as time passes, the fluid flow depends on convection and buoyancy of the enclosure. In Case 1, the heating region was been in the central position of the bottom wall. In case 2, the heating region was in the left position of the bottom. In case of Case 1, the lapse time of sensing the temperature of 72$^{\circ}C$ is approximately 15 sec almost at the same time in the coordinates (6, 22), (11, 22). In case of Case 2, the lapse time in the coordinates (6, 22), (11, 22) was 27 sec, 25 sec repectively. Also in case of Case 1 or Case 2, the gradients of y-position of the two sensors are transposed each other.

• 융합보안논문지
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• 제5권3호
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• pp.1-7
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• 2005

오늘날의 네트워크는 여러 위협적인 공격에 취약한 상태에 있다. 특히 인터넷 서비스나 전자상거래와 같은 서비스를 제공하는 기업은 위험에 노출이 되어 있고 공격자의 타겟이 된다. 그리하여 기업들은 각종 보안솔루션을 사용하는 것이 현실적이다. 이것은 우리가 이용하고 있는 학내망에서도 예외일 수는 없음으로 학내망에도 FireWall, IDS, VirusWall VPN 등 여러가지 보안 솔루션들이 존재한다. 관리자들은 이 여러 가지의 보안솔루션들을 관리해야 하는데 그러기에는 효율성이 떨어져 모든 솔루션을 관제 및 통제 할 수 있는 어떠한 관리 시스템이 필요하게 되었다. 본 논문에서 ESM이 관리하는 보안솔루션에 대한 기본적인 내용과 ESM을 사용했을 때의 장단점을 다룬다. 또한 그렇게 구현된 학내망에 ESM을 이용하여 관리자가 학내망을 더욱 효율적이고 체계적으로 관리할 수 있는 방안을 제시한다.

• 한국태양에너지학회 논문집
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• 제30권1호
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• pp.42-49
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• 2010

The IIS(Internal Insulation System) is applied in most Korean apartment buildings which are the most common type of residential buildings. Consequently, there are many cases in which the layer of insulation is disconnected by the structural components at the wall-slab and wall-wall joints in the envelope. These joints become thermal bridges where the risk of heat loss increases. It is expected that the EIFS(External Insulation and Finish System) is the solution to this problem. In this study, annual heating and cooling loads of apartment buildings with IIS and EIFS were compared using Design Builder program in order to evaluate the thermal storage effect of EIFS where the concrete thermal mass is located inside of the insulation material. As results, the apartment building with EIFS could reduce annual heating and cooling loads by 2.4% and 4.1%, respectively.

• 한국디지털건축인테리어학회논문집
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• 제12권3호
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• pp.59-66
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• 2012

Autoclaved Lightweight Concrete(ALC) features such as a high performance insulation, the fire resistance, the advantage of easy handing construction, and lightweight panels applied the curtain wall system. ALC materials are certified as non-toxic environmental and eco-friendly productions. But ALC external panels mixed with blast furnace slag pounder and silica fume have to be coated with a stucco compound or plaster because of resisting the ambient environment. This study is that mixing tests to evaluate a performance analysis of exterior paints to be make-up pigments(organic or inorganic) coated with panel surface. Testing compared by KS F 2476; flow test, KS F 2426; compression strength test, KS F 2762; bond strength test. In results, the case of the inorganic binder, ratio of alumina cement : anhydrite is 90:10 to 80:20 at the highest level of intensity. In the case of the organic binder, adhesive strength rating at surface of ALC, the pullout strength is below 0.5 $N/mm^2$ but the normal concrete is over 2.0$N/mm^2$. A contents ratio of EVA resin is more than 3% and then bond strength is effectively.

• 설비공학논문집
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• 제26권2호
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• pp.61-66
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• 2014

Exhaust heat recovery ventilation systems conserve energy through enthalpy recovery between air intake and exhaust, and they are being increasingly used. An exhaust heat recovery ventilation system can be installed in the ceiling of a balcony or emergency evacuation space. However, in the case of fire, the emergency evacuation space has to by law remain as empty space, and therefore, a ventilation system can't be installed in an emergency evacuation space. Therefore, the need for a proper installation space for a ventilation system is emphasized. In this study, to install a heat recovery ventilation system in a lightweight wall, a heat exchanger was assembled of thickness below 140 mm. The efficiency of heat recovery was analyzed through performance experiment, in the case of the cooling and heating mode. The heat recovery efficiency increases when the surface area is increased, by using closer channel spacing in the heat exchanger, or by increasing the size of the heat exchanger.

• 대한설비공학회지:설비저널
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• 제16권4호
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• pp.406-414
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• 1987

As one of the explosion suppression methods of LPG tank exposed to hot environment by an accident or fire, some material which has large heat capacity and thermal conductivity can be installed inside the LPG tank in order to suppress the temperature increasement of tank wall. In the present study, theoretical model for the horizontally locating cylindrical LPG tank with and without the aluminum explosion suppression material has been developed to predict the characteristics of system. As a parametric study, effects of two major parameters, thickness of material filling and initial vapor volume fraction, on the time variation of wall temperature, temperature and pressure in tank are numerically examined. The results of present study show that the thickness of material filling does not give big differences in the suppression characteristics when the thickness of filling is larger than three inches. In case of material filling, there are marked suppression effects to the increase-ment of wall temperature, average vapor temperature and pressure in tank compared with the case of no filling.

• 한국융합학회논문지
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• 제11권1호
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• pp.301-308
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• 2020

본 연구는 다중이용시설의 화재대피 상황에 대한 분석을 바탕으로 다중이용시설에 적합한 피난유도등 디자인을 제안하고자 하였다. 화재는 재난으로 임의묘사가 불가하여 다중이용시설의 대피상황을 이해하기 위한 동영상 분석을 진행하였다. 동영상 분석을 통해 다중이용시설 화재의 대피상황에서 기존 피난유도등의 문제점과 필요한 니즈를 파악할 수 있었고 이를 피난유도등 디자인에 반영하였다. 피난유도등 디자인 결과, 벽부형 유도등은 LED 배치구조를 달리하여 제품의 두께를 최소화 하였다. 천정형 유도등은 복잡한 구조의 복도에 추가적으로 설치할 수 있도록 형태를 보완하였다. 본 연구의 결과는 실제 피난유도등 제작에 사용되는 기준들을 바탕으로 디자인한 결과로 향후 실험측정과 전문가 자문을 통한 보완단계를 거쳐 실용화 방안을 모색하고자 한다.