• 한국멀티미디어학회:학술대회논문집
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• 한국멀티미디어학회 2003년도 춘계학술발표대회논문집
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• pp.650-653
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• 2003

전자 메일(e-mail)은 현대인의 삶에서 매우 보편적으로 사용되고 있으며, 또한 비즈니스 측면에서도 필수적인 통신도구가 되고 있다. 현대 사회의 인프라가 온라인 환경으로 이동함에 따라서 전통적인 면대면(face-to-face)방식에서 예기치 못한 문제가 발생하고 있다. 하지만, 인터넷은 전자적 정보에 대한 안전하고, 공정한 교환(fair-exchange)과 같은 비즈니스 통신 모델에서 요구되는 서비스를 제공하지 못한다 본 논문에서는 기존의 보안 메일 기술인 S/MIME, PGP와는 차별화된 기술로서, 전달 메시지의 암호화는 물론 송·수신자 사이의 공정한 교환을 보장하는 Certified E-mail 시스템을 제안하고자 한다. 본 논문에서 제안하는 방안은 셀룰러 폰이나 PDA 사용자 단말기의 공개키 암호 알고리즘 연산에 따른 오버헤드를 최소화하도록 설계되었다.

• 아태비즈니스연구
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• 제15권2호
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• pp.23-40
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• 2024

Purpose - The purpose of this study is to examine the relation between accruals quality and managers' choice on the type of voluntary disclosure. Design/methodology/approach - Samples of this study are 8,248 firm-year observations listed in Korea Stock Exchange. Poisson regression analysis was hired in order to analyze the association between disclosure frequency and accruals quality because the dependent variables are count data. Findings - First, this study finds that managers' use of non-earnings-related type of voluntary disclosure is negatively related to accruals quality while their use of earnings-related disclosure is positively related to accruals quality. Second, discretionary accruals quality as well as innate accruals quality is significantly associated with disclosure frequency. Research implications or Originality - This study extends the line of research by incorporating the content of voluntary disclosure, earnings- and non-earnings-related information. The results of this study suggest that accruals quality may play a role in the choice of disclosure manner when investigating managers' voluntary disclosure.

• Communications for Statistical Applications and Methods
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• 제29권1호
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• pp.85-101
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• 2022

Derivative-linked securities (DLS) is a type of derivatives that offer an agreed return when the underlying asset price moves within a specified range by the maturity date. The underlying assets of DLS are diverse such as interest rates, exchange rates, crude oil, or gold. A German 10-year bond rate-linked DLS and a USD-GBP CMS rate-linked DLS have recently become a social issue in Korea due to a huge loss to investors. In this regard, this paper accounts for the payoff structure of these products and evaluates their prices and fair coupon rates as well as risk measures such as Value-at-Risk (VaR) and Tail-Value-at-Risk (TVaR). We would like to examine how risky these products were and whether or not their coupon rates were appropriate. We use Hull-White Model as the stochastic model for the underlying assets and Monte Carlo (MC) methods to obtain numerical results. The no-arbitrage prices of the German 10-year bond rate-linked DLS and the USD-GBP CMS rate-linked DLS at the center of the social issue turned out to be 0.9662% and 0.9355% of the original investment, respectively. Considering that Korea government bond rate for 2018 is about 2%, these values are quite low. The fair coupon rates that make the prices of DLS equal to the original investment are computed as 4.76% for the German 10-year bond rate-linked DLS and 7% for the USD-GBP CMS rate-linked DLS. Their actual coupon rates were 1.4% and 3.5%. The 95% VaR and TVaR of the loss for German 10-year bond rate-linked DLS are 37.30% and 64.45%, and those of the loss for USD-GBP CMS rate-linked DLS are 73.98% and 87.43% of the initial investment. Summing up the numerical results obtained, we could see that the DLS products of our interest were indeed quite unfavorable to individual investors.

• 분석과학
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• 제25권6호
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• pp.483-491
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• 2012

본 연구는 재조합 단백질 A를 생산하기 위한 정제공정 즉, 생산공정은 양이온교환칼럼(SP)과 음이온교환칼럼(Q)을 통하여 정제한 후 최종 재조합 단백질 A를 생산하게 되는데, 공정단계별로 생산된 시료를 바로 다음단계 공정으로 가지 못하는 경우 보관을 하는데 있어 안정성 확보 문제를 가지고 있다. 이에 본 연구에서 생산공정에서 생산된 시료를 보관 했을때 적정 보관조건과 시간을 알아보고자 하는데 목적이 있다. 즉, 공정시료의 저장방법 및 저장기간 설정과 경시변화에 따른 품질의 안정성의 평가를 목적으로 한다. 실험항목은 엔도톡신, SDS PAGE, HPLC 순도 그리고 농도이다. 실험결과 양이온교환칼럼 통과 후 냉장($4^{\circ}C$), 실온보관에서 SDS PAGE는 major band, 엔도톡신은 5.0 Eu/mg이하, 농도에서는 평균 8.21~8.24 mg/mL, RSD% 0.10~0.62%, 그리고 HPLC 순도 214 nm에서 평균 99.24~99.37%, RSD% 0.22~0.29%, 280 nm에서 평균 89.72~89.80%, RSD% 0.62~1.26%로서 다소 안정된 결과를 나타내었다. 음이온칼럼통과 후 냉장($4^{\circ}C$), 실온보관에서 SDS PAGE major band, 엔도톡신 0.5 Eu/mg이하, 농도는 평균 5.59 mg/mL, RSD% 0.03~0.10% 그리고 HPLC 순도 214 nm에서 평균 99.74%, RSD% 0.10~0.11%, 280 nm에서 평균 96.16~96.85%, RSD% 0.72~1.13%의 결과를 보였다. 상기의 실험결과로 재조합 단백질 A 제조공정시료의 실온과 $4^{\circ}C$에서 7~8 일 그리고 20~21 일 보관은 물질분해 특성이 없이 안정성이 확보 되었다는 결론을 얻을 수 있었다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권6호
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• pp.2546-2566
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• 2016

This paper investigates an efficient transmission scheme for the remote wireless sensors to receive information which is rarely discussed in the integrated remote wireless sensor and multibeam satellite networks (IWSMSNs). The networks can be employed to exchange sensing information for emergency scenario, ocean scenario, and so on, which are isolated from available terrestrial networks. As the efficient transmission link is important to the IWSMSNs, we propose a hybrid full frequency (HFF) precoding by taking advantage of frequency reuse and multiple-input multiple-output (MIMO) precoding. Considering energy efficiency and sinks fairness are crucial to transmission link, thus the HFF precoding problems are formulated as transmit power minimization (TPM) and max-min fair (MMF) received signal to interference plus noise ratio (SINR) problems, which can be transformed to indefinite quadratic optimization programs. Then this paper presents a semi-definite programming (SDP) algorithm to solve the problems for the IWSMSNs. The promising potential of HFF for the real IWSMSNs is demonstrated through simulations.

• 한국실내디자인학회논문집
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• 제17권6호
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• pp.216-224
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• 2008

The represented Design Language have to include design meaning by functions in Interior. It also is able to easy and quick to understand in conversation for the design proposal. In this study, 6 stages suggest for the basic forming image in Interior Design. Those are form, line, space, color, material and principles of design. And essential image language arranged by preceding research. The fundamental 6 elements of space are used for explanation with the minimum method to make consumer understand through some image. Image has the communication function as a visual conversation in Space Design. The purpose of using the image language is the exchange into communication by written visual image. In order to it is necessary to delivery correct meaning of Interior Design for the understand between consumer and designer for the suggestion through images. Therefore, making categories for representation-language from image features of interior design is a important research with the value to share the spatial pattern. It will be expected to add the spatial Image language by processing with new trend.

• 한국산업융합학회 논문집
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• 제2권1호
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• pp.91-95
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• 1999

The Streptomyces albulus broth, when the polylysine in the broth, that has powerful growth inhibiting effect far many microbes, is its maximum, had filtered off the cells, to use the broth as preservative for keeping favorable taste of Korean Kimchi. Some microorganisms in their specific growth medium, known to deteriorate the useful nutrient of the Kimchi, has grown with different amounts of the inhibiting broth, to determine the minimum growth inhibition concentration. The ${\varepsilon}$-poly-L-lysine had been identified from the IR spectroscopic analysis of the purified poly lysine of the broth from ion exchange chromatographic separation. The content of the polylysine had been determined by methyl orange decoloration effect. Though the minimum inhibition concentration, evaluated by the naked eye based on the conventional method measuring the turbid feature after 18 hours of culture, has different values each other, the observed effects confirmed that the crude broth could be used as a natural preservative for the Kimchi in extending the fair taste.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제5권11호
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• pp.1909-1928
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• 2011

Node cooperation during packet forwarding operations is critically important for fair resource utilization in Community Wireless Mesh Networks (CoWMNs). In a CoWMN, node cooperation is achieved by using fairness protocols specifically designed to detect and isolate malicious nodes, discourage unfair behavior, and encourage node participation in forwarding packets. In general, these protocols can be split into two groups: Incentive-based ones, which are managed centrally, and use credit allocation schemes. In contrast, reputation-based protocols that are decentralized, and rely on information exchange among neighboring nodes. Centrally managed protocols inevitably suffer from scalability problems. The decentralized, reputation-based protocols lacks in detection capability, suffer from false detections and error propagation compared to the centralized, incentive-based protocols. In this study, we present a new fairness protocol management scheme, called Hybrid FPMS that captures the superior detection capability of incentive-based fairness protocols without the scalability problems inherently expected from a centralized management scheme as a network's size and density grows. Simulation results show that Hybrid FPMS is more efficient than the current centralized approach and significantly reduces the network delays and overhead.

• 한국도서관정보학회지
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• 제30권4호
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• pp.279-298
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• 1999

정보화가 진행되어감에 따라 정보격차는 더욱 크게 발생한다. 이 논문에서는 정보격차의 요인으로 경제적 빈부차, 정보의 상품화, 그리고 정보수단의 사유화, 정보폭증을 들고 있다. 이러한 요인에 의해 필연적으로 발생하는 정보부자와 빈자간의 정보격차의 해소를 위해서는 정책적인 노력이 있어야 하며 이러한 정보정책은 민주주의의 원칙에 의거하여 이루어져야 한다. 이 논문에서는 민주주의의 원칙에 따라 공정하고 공평한 정보에의 접근과 정보이용이 이루어질 수 있도록 정보의 공공영역이 확보되어야 하며, 이를 위해서 공공도서관과 공공교육, 공론의 장의 역할과 기능이 확대되어야 함을 주장한다.

• 한국통신학회논문지
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• 제24권8A호
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• pp.1227-1237
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• 1999

본 논문에서는 공평한 비밀정보 교환을 위한 기본 프로토콜인 불확정전송 프로토콜을 제안한다. 이를 위해 Lein Harn등이 앞서 제안한 이산대수문제에 기반을 둔 검증가능 불확정전송방식에 대하여 고찰하고 기존의 방식에다 부가적인 기능을 가지는 새로운 불확정전송 프로토콜을 제안한다. 이들의 방식에서 고려하지 않았던 송신자 확인 및 송신자의 송신사실 사후 부인방지 등의 여러 기능이 부가된 대화형 불확정전송 프로토콜을 제안한다. 이를 위해 Bit Commitment 기법을 이용하는 방법과 RSA에 기반한 디지털서명기법을 이용하는 두 가지 방법을 제안한다.