• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.11
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• pp.5625-5641
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• 2017

Certificateless public key cryptography resolves the certificate management problem in traditional public key cryptography and the key escrow problem in identity-based cryptography. In recent years, some good results have been achieved in speeding up the computation of bilinear pairing. However, the computation cost of the pairing is much higher than that of the scalar multiplication over the elliptic curve group. Therefore, it is still significant to design cryptosystem without pairing operations. A multi-signer universal designated multi-verifier signature scheme allows a set of signers to cooperatively generate a public verifiable signature, the signature holder then can propose a new signature such that only the designated set of verifiers can verify it. Multi-signer universal designated multi-verifier signatures are suitable in many different practical applications such as electronic tenders, electronic voting and electronic auctions. In this paper, we propose a certificateless multi-signer universal designated multi-verifier signature scheme and prove the security in the random oracle model. Our scheme does not use pairing operation. To the best of our knowledge, our scheme is the first certificateless multi-signer universal designated multi-verifier signature scheme.

• 한국디지털정책학회:학술대회논문집
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• 2007.06a
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• pp.325-332
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• 2007

The purpose of this study is to get a politic advanced idea to operate a pro-environment based u-city through the overcome problems on the construction policy for the even areal distribution, and the development for the model structure of the high level. Advanced pro-environmental ubiquitous urban construction becomes an example of the practical level linked by the national agenda as uKorea policy. The Idea of the national land informal ion systems transforms to enhance or to guide the national strategic industry to implement balanced development as grand objectives of the national land due to the factor that 'the economic development 5 years plan' altered to 'the national land 5 years plan'. Therefore, ubiquitous echo city construct ion becomes realized as static spatial informal ion construct ion and dynamic mobile based ubiquitous lives operable by the information infrastructure and IT839 policy items operation. For the synergy effects through this task, it requires a strong empowerment of the information industries and a new growing core engine of the national economy through the policy of the mutual satisfaction on the spat io-temporal information and the pro-environment information systems.

• Journal of the Korea Institute of Building Construction
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• v.11 no.4
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• pp.407-418
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• 2011

Recently energy management measures at the political level, for the purpose of reducing energy consumption in the building sector, are being actively introduced. As a practical method, the exterior insulation method, which is proven to effective in reducing the energy loss through walls, has been favored. In this study, detailed implementations are suggested to activate exterior insulation system which can improve the housing insulation performance. The newly designed Gang-form system with hanging scaffolding was suggested to revamp constructability for finishing outer wall. The research results are based on a multifaceted analysis of the current problems of exterior insulation systems, and on recommendations proposed by exterior insulation experts in the Charrette discussion. The study has indicates that the customized TACT schedule considering the site condition has shortened the construction period to 5 months from 7.5 months. Through utilizing the suggestions of this study, the prevalence of exterior insulation systems is expected to become widespread.

• Journal of the Korea Institute of Building Construction
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• v.13 no.1
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• pp.38-47
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• 2013

When building with concrete in cold weather, an insulation method of heat curing must be determined, and a holistic curing plan that considers the characteristics of structures, the heat loss coefficient of a curing sheet, the joint condition of the curing materials and the quantity of heat produced by a heating apparatus is an essential prerequisite for protection against early frost damage. But on a number of national construction sites, there have been serious problems in cold weather concreting due to the unreliability of the information obtained from practical experience. In the construction field in Japan, there is a specification for heat curing prepared by Japanese Architectural Society, which provides an equation for calculating heat quantity. It is also necessary to adopt a detailed specification for a standard heat curing method that is applicable to all national construction sites. In this study, the effect of bubble sheets on the economic feasibility of cold weather concrete is investigated through a comparison with the blue sheets commonly prescribed in national construction sites. In conclusion, this study found that bubble sheets had the effect of reducing the cost of curing materials and the fuel cost consumed by a heating apparatus, compared to the use of blue sheets.

• Journal of the Korean Home Economics Association
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• v.41 no.4
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• pp.143-155
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• 2003

This study presents the institutional households as an object of research from german society, discussing their social necessity and development scheme. The results of the study will be useful informations for systematic researchs according to institutional household in South Korea. In recent years, the social functions of the institutional household have become an important issue in South Korea. In this respect, the requirements of customers, and other interested parties with regard to these institutions have changed, which results in a different general framework for the management of these institutions. For this reason, courses in the Economics of the Institutional Household were established as part of the Department of Private Household at some universities in South Korea. In order to assure the continuous development of the research on Economics of Institutional Household theoretical and practical support from different arise is required. In particular, three issues aries here: 1. the structure of the curriculum and the possibilities for its development in universities, 2. interdisciplinary research on the Economics of the Institutional Households in cooperation with other departments, 3. continuing cooperation between institutions and universities.

• Culinary science and hospitality research
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• v.14 no.3
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• pp.196-209
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• 2008

This study was conducted to mass-produce brown stock optimized by using a high-pressure heating extractor and to use brown stock as a material for developing various products. For these purposes, we attempted to produce standardized brown stock by extracting brown stock using a high-pressure heating extractor and compared it with brown stock extracted by the traditional method in terms of general elements and mechanical and sensory characteristics. With regard to how to prepare optimal brown stock, the best brown stock was that extracted seven times repeatedly by the traditional method, but the method had a large economic loss in terms of material consumption and took a long time in extraction. Thus, considering time and labor, it was concluded that extraction at 120$^{\circ}C$ for 15 hours using a high-pressure heating extractor is the optimal extraction condition in terms of economic efficiency and quality. The results of this study are expected to be useful as a practical material for making brown stock production process more convenient, applying cooks' traditional cooking techniques to mass production, maintaining standardized superior quality and taste, and improving shelf life.

• Child Health Nursing Research
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• v.17 no.2
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• pp.74-83
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• 2011

Purpose: The purpose of this study was to develop a child health care protocol for teachers in child day care centers. Methods: The ADDIE model with 10 Kid Keys was applied to develop this child health care protocol. All contents were developed through content validity test by 7 professionals and need assessment and evaluation by child day care center teachers. Results: This protocol consisted of 10 keys, as follows: "Health Examination/Growth & Development", "Practice of Health Life", "Management of Communicable Disease", "Negligent Accident", "Coping with Emergency and Transference", "Child Abuse", "Nutrition/Obesity", "Quality Assurance of Staff", "Parent Education", "Guidance & Supervision of Child Day Care Centers". The contents contained goals, objectives, teaching content, suggested activities for children, writing forms related to each subject, and self-evaluation sheet. Conclusion: This protocol can be practical and effective for child health care in child day care centers and it is hoped that it will be utilized in more child day care centers.

• Korean Journal of Occupational Health Nursing
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• v.25 no.3
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• pp.238-248
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• 2016

Purpose: The purpose of this empirical research was to describe the contents what had happened to nurses experiencing taeoom. Methods: This study explored the phenomenological ways to understand lived experiences in nurses' 'Taeoom' and investigated the 'Taeoom' through the deductive content analysis. For the this study, the data was collected through individual interviews with 11 nurses who worked over 12months in 1 hospital, lived in 5 areas, working 7 nursing unit of 10 hospitals. The interviews conducted by semi structured questions about participants' lived experiences in 'Taeoom'. Results: Inductive contents analysis identified 5 categories and 15 subcategories. Main themes in this study included a failed membership, difficult of practical field adaptation, feared with nursing unit life, self-centered peer relationships and rite of passage. Conclusion: This study results have been illuminated with edged sword which has a dark side and a light side to experienced in 'Taeoom'. Newly employed nurses have suffering from 'Taeoom' as well as retained nurse. Therefore, policy and practice programs for a diminution of suffering and management for nurses 'Taeoom' should be developed and implemented.

• Journal of Information Technology Applications and Management
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• v.19 no.4
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• pp.41-59
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• 2012

This study examines the roles of user resistance and social influences on the acceptance and continuous usage of smartphones at different stages of adoption. The respondents were classified into three groups according to their innovation adoption stage : non-user group, the potential user group and the trial user group. Theories relevant to user resistance, social influences including normative social influences and informational social influences, as well as user adoption and continuance behavior were reviewed and integrated into our research model. In order to verify the proposed structured equation model, we conducted an online survey by targeting mobile phone users and collected data to be analyzed through a partial least squares (PLS) test. This study tested whether there exists differences in the effects of user resistance and different types of social influence on user's adoption or continuance intetion among these three groups. The results showed that user resistance exists in all adopter groups and that it has significant negative influences on intention to use a smartphone. The findings also revealed that user resistance can be enhanced or resolved by two types of social influence; informational social influence resolves user resistance regardless of the adopter category, while normative social influence enhances the user resistance of potential users. Furthermore, the findings show that social influence regardless of the type positively affects user intention. Several theoretic and practical implications pertaining to the results are discussed.

• Journal of Information Technology Applications and Management
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• v.14 no.4
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• pp.97-120
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• 2007

Development of information technology and Internet brought big changes in information society. Quantity of information increased rapidly and various types of information were presented through diverse channels. This change brought an impact in electronic commerce environment. A large number of products are transacted in online market. And various search functions and product information are presented for supporting customer's decision making. This study examined the effect of external information on purchase decision-making in electronic commerce environment. An experiment was conducted to see the customer product review, unit sales, etc. on purchase decision-making process in online shopping mall based electronic commerce. As a result of study, external information referring to number of purchasing, positive product review, and reliability of information has a positive effect on purchase-decision. The significance of the study can be found in that it defined 1) external information has an effect on decision-making, 2) positiveness and reliability of product information showed that they have an influence on customer, and 3) when self opinion and other person's opinion are different, one is not satisfied with decision making process. The results of the study can be of practical use in the design and implementation of online shopping mall in electronic commerce.