• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권4호
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• pp.1892-1903
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• 2016

Mobile social network is becoming more and more popular with respect to the development and popularity of mobile devices and interpersonal sociality. As the amount of social data increases in a great deal and cloud computing techniques become developed, the architecture of mobile social network is evolved into cloud-based that mobile clients send data to the cloud and make data accessible from clients. The data in the cloud should be stored in a secure fashion to protect user privacy and restrict data sharing defined by users. Ciphertext-policy attribute-based encryption (CP-ABE) is currently considered to be a promising security solution for cloud-based mobile social network to encrypt the sensitive data. However, its ciphertext size and decryption time grow linearly with the attribute numbers in the access structure. In order to reduce the computing overhead held by the mobile devices, in this paper we propose a new Outsourcing decryption and Match-then-decrypt CP-ABE algorithm (OM-CP-ABE) which firstly outsources the computation-intensive bilinear pairing operations to a proxy, and secondly performs the decryption test on the attributes set matching access policy in ciphertexts. The experimental performance assessments show the security strength and efficiency of the proposed solution in terms of computation, communication, and storage. Also, our construction is proven to be replayable choosen-ciphertext attacks (RCCA) secure based on the decisional bilinear Diffie-Hellman (DBDH) assumption in the standard model.

• 한국주거학회논문집
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• 제20권4호
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• pp.31-38
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• 2009

In our country, the application of the design method of face to face dimension in wall-slab apartment has passed 10 years. So MC(Modular Coordination) design method has fixed in the design step to some degree. In Design and Work Execution of House the exclusive area of the apartment was calculated by face to face dimension. And the term of face to face dimension was known broadly to clients, construction company, etc. But design method of face to face dimension is not to simply extend the room size so far as wall depth in design process but to ensure the actual space should be considered with efficient use and assembly of building components. That is to say, Design method of face to face dimension is not to be defined by design step but to be related with construction and maintenance. However in construction process the point of face to face design method was not understood even now. So the purpose of this study was to extract the effect and question of face to face design method in construction process by survey of actual condition of structure and construction quality, and compare this result with existing construction method. The following project of this study is to survey of actual condition of interior components such as gypsum board, windows & doors etc. Therefore this study is to induce architectural long-life through architectural standardization construction and component's exchange, and, by the subject of the study on Apartment to have design guideline and basis for joining part between Gypsumboard and windows.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2009년 춘계학술발표대회 논문집
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• pp.230-235
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• 2009

In our country, the application of the design method of face to face dimension in wall-slab apartment has passed 10 years. So MC design method has fixed in the design step to some degree. In Design and Work Execution of House the exclusive area of the apartment was calculated by face to face dimension. And the term of face to face dimension was known broadly to clients, construction company, etc. But design method of face to face dimension is not to simply extend the room size so far as wall depth in design process but to ensure the actual space should be considered with efficient use and assembly of building components. That is to say, Design method of face to face dimension is not to be defined by design step but to be related with construction and maintenance. However in construction process the point of face to face design method was not understood even now. So the purpose of this study was to extract the effect and question of face to face design method in construction process by survey of actual condition of structure and construction quality, and compare this result with existing construction method. The following project of this study is to survey of actual condition of interior components such as gypsum board, windows & doors etc. Therefore this study is to induce architectural long-life through architectural standardization construction and component's exchange, and, by the subject of the study on Apartment to have design guideline and basis for joining part between Gypsumboard and windows.

• 한국건설관리학회논문집
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• 제7권2호
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• pp.62-70
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• 2006

최근 건축물이 사용성, 효율성, 규모 측면에서 다양하게 변화함에 따라 건설공사의 품질은 더욱 중요하게 인식되고 있다. 1962년에 도입된 감리제도는 공공부문에서는 발주자의 위임을 받은 공사감리자에 의해 공사단계에서 확인 또는 지시로 목표품질을 확보하고자 정부는 1994년에 건설기술관리법 개정을 통해 책임감리제도를 도입하였고, 민간부문 중 공동주택의 부실공사를 방지하고자 주택건설촉진법을 개정하여 공사감리제도를 강화하는 등 공사관리의 효율성과 품질의 향상을 가져왔다. 도심기능의 재정비를 위한 차원에서 재개발 사업의 한가지 유형으로 고층화된 주상복합건물이 도입되면서 여러 형태적 사회적 요구에 따른 제도적 변화가 지속되어 왔다. 정부는 주택시장 안정을 위해 300세대 이상의 주택을 건설하는 경우 해당 주상복합건물에 대해 주택법을 적용하도록 관련 법령을 개정하였다. 그러나 이러한 관련법령의 개정사항은 건축법에 의한 감리대상 건축물 중 일부에 한정되어 왔다. 따라서 현행 감리관련 법령 및 제도는 고층화 추세에 따라 다양하고 복잡한 주상복합건물의 공사진행 과정을 효과적으로 감리하기에는 미흡하다고 할 수 있다. 이에 본 연구는 기존 감리제도에 관한 연구와 공사참여자 및 입주자의 설문조사를 바탕으로 주상복합건물의 감리제도의 개선방안을 제안하고 그에 따른 기대효과를 제시하였다.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2002년도 학술대회지
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• pp.468-473
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• 2002

최근 급변하는 환경 속에서 전략적인 정보화의 추진은 국내 기업의 경쟁력 강화에 핵심적인 역할을 수행한다. 특히, 중소건설업체의 정보화는 대기업체에 비해 기업규모나 정보화범위에 있어서 수준이 낮고 정보화를 위한 환경이 매우 열악하다. 따라서, 중소건설업체의 정보화를 효과적으로 추진하기 위해서는 현 상태의 정보화 수준이 평가되고, 향후 단계별 달성해야될 수준이 어떠해야 할지를 명확히 파악하는 것으로부터 출발해야 할 것으로 본다. 이에 본 논문은 현행 국내 중소건설업체의 정보화를 추진하는데 있어서 정보화 수준, 문제점 및 요구사항 등 정보화 실태를 정확히 진단하는데 필요한 지표를 개발 하고자한다.

• Corrosion Science and Technology
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• 제14권2호
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• pp.47-53
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• 2015

Recently, the bending process is greatly applied to fabricate the pipe line. Bending process can reduce welding joints and then decrease the number of inspection. Thus, the maintenance cost will be reduced. Induction heat bending process is composed of bending deformation by repeated local heat and cooling. By this thermal process, corrosion properties and microstructure can be affected. This work focused on the effect of induction heating bending process on the properties of ASME SA106 Gr. C low carbon steel pipes. Microstructure analysis, hardness measurements, and immersion corrosion test were performed for base metal and bended area including extrados, intrados, crown up, and down parts. Microstructure was analyzed using an optical microscope and SEM. Hardness was measured using a Rockwell B scale. Induction heat bending process has influenced upon the size and distribution of ferrite and pearlite phases which were transformed into finer structure than those of base metal. Even though the fine microstructure, every bent area showed a little lower hardness than that of base metal. It is considered that softening by the bending process may be arisen. Except of I2, intrados area, the others showed a similar corrosion rate to that of base metal. But even relatively high rate of intrados area was very low and acceptable. Therefore, it is judged that induction heat bending process didn't affect boric acid corrosion behaviour of carbon steel.

• 정보관리학회지
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• 제28권3호
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• pp.83-101
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• 2011

국제 표준인 ISO 15489와 관련코드에 따르면 공공조직이든 민간조직이든지를 막론하고 안정적인 기록물 분류체계를 구현하게 하는 기능 분류 사용을 권고하고 있다. 기업에서도 이를 따라 업무 수행 기록물을 분류 축적하여 검색 활용할 수 있는 체계를 구축하는 것은 기업 성장을 위해서 중요하다. 따라서 기업의 기록물 분류체계 개발에 적용할 수 있는 분류기준이나 개발 방법론 연구 및 모형의 연구가 반드시 필요하다. 본 연구에서는 우리나라 대기업 3개 회사와 중소기업 4개 회사 등 총 7개의 종합건설기업의 기록물 분류체계 사례연구를 통하여 분류체계의 내용을 비교 분석하였다. 사례연구를 통하여 도출한 분류원칙을 정리 종합하여 핵심적인 건설기록물 분류기준을 제시하고, 건설기록물 분류체계 모형을 도출하기 위하여 대기업 사례기업의 본사조직 및 프로젝트조직의 대분류 및 중분류 항목 구성을 상호 비교하면서 표준적인 본사조직 및 프로젝트조직 기록물 분류 항목을 도출하는 과정을 기술하고 그 결과로 개발된 건설기록물 분류체계 모형을 제시하였다.

• 대한산업공학회지
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• 제42권4호
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• pp.270-279
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• 2016

A glass product manufacturing company transports a large number of flat glass products from a manufacturing firm to a building construction site. The products are transported using specially designed racks, which assure fewer glass breakages during the deliveries. This study determines the sizes of the racks which minimize the total logistics cost including costs for rack purchasing, handling, transportation, and inventory costs. The determination of the rack size should consider tradeoff relationships between the amount of glasses piled in a rack and the number of racks loaded on a truck, and affects the required number of racks and the truck operational cost. A truck loading algorithm is proposed to maximize a high truck utilization, and an enumeration method is proposed to determine the optimal combination of rack sizes considering the total logistics cost. The numerical example is solved by using a real data.

• 건축역사연구
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• 제30권3호
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• pp.7-20
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• 2021

Since 1939, Bupeyong was rapidly urbanized and industrialized for the purpose of constructing military logistics base of the empire of Japan. Based on Kyungin urban planning of 1940 and industrial land development plan of Kyeonggido, many military factories and arsenal were constructed, and great amount of housing were also built for their workers from 1939 to 1944. Although the initial urban planning was unfinished, urban change from rural area to military industrial city in the late Japanese colonial era, made identity of city of Bupyeong. Workers houses which built during five years vary in different size and type, and somewhat reflects discussions about housing attempts to solve the housing shortage. This study aims to analyze architectural characteristics of workers housing related with discussions of housing, and to evaluate its value as an industrial heritage which constitute the urban landscape of the industrial city of Bupyeong. Workers houses in Bupyeong were constructed by military factories, construction company, and Chosun housing administration, with land readjustment planning. As the war became serious, workers housing became smaller and simpler. Construction of workers housing was essential part of modern military industrial city, bupyeong, and many of workers housing are still remained whereas most of factories were demolished, thus workers housing of bupyeong has significant meaning as industrial heritage of Bupyeong.

• 한국안전학회지
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• 제10권2호
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• pp.97-104
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• 1995

To evaluate readily the effect of unconfined vapor cloud explosion(UVCE) having high possibility of accident and risk in chemical industries, the expert system of UVCE was developed and its applicability on a real accident was analyzed. We found that the hazard of UVCE could be well evaluated from the TNT equivalency model and the empirical loss data produced by overpressure for chemical facilities. By using the developed expert system, the size of vapor cloud, the quantity of vaporization, the released energy, the overpressure range from explosion point, and the impact damage of each installation could be estimated respectively. Also, probable maximum loss and catastrophic loss potential for real accident( cyclohexane release in Flixborough Nypro company) were estimated and compared with damages of the accident. As a result, the developed expert system could be well applicable to real accident.