• 실천공학교육논문지
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• 제7권1호
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• pp.17-23
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• 2015

전 세계적으로 소프트웨어에 대한 관심이 커지고 교육의 필요성에 대한 인식이 확산되고 있는 가운데, 우리나라에서는 2015년 중학교 신입생부터 소프트웨어 중심사회 실현전략으로 소프트웨어에 대한 교육을 의무화하겠다고 발표했다. 평소 컴퓨터에 대한 관심이 많고 컴퓨터를 좋아하는 학생들에게서는 긍정적인 반응이 보이는 반면, 현재의 학업 공부만으로 벅찬 학생들 입장에서는 부정적인 반응도 보일 수 있다. 즉, 실제 교육에 있어서 단순하게 의무교육만 존재하고 실제로 체계적인 교육이 이루어지지 않는다면 오히려 제대로 된 교육을 받기도 전에 흥미를 잃어버려 아예 관심을 돌려버리는 일이 생길 수도 있다. 그렇다면 기초부터 체계적인 교육을 하기 위해 필요한 것이 무엇이고 어떻게 소프트웨어를 쉽고 재미있는 것으로 인식시킬 수 있는지 고민할 필요성이 있다. 본 논문에서는 제작된 장치에서 프로그램을 수정하고 적용하면서 프로그래밍 툴과 프로그램언어를 익힐 수 있어 좀 더 쉽고 효율적인 소프트웨어 교육을 진행할 수 있도록 하는 하드웨어와 기본 소프트웨어를 제안하고자 한다.

• 한국정보과학회논문지:정보통신
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• 제28권3호
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• pp.369-376
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• 2001

기존의 호스트 기반 보안 시스템에서 네트워크 기반의 보안 시스템으로 침입차단 시스템을 설치하지만 침입차단 시스템은 보안에 대하여 최소 권한을 가지므로 사용자에게 투명한 서비스를 제공해 주지 못한다. 따라서 침입차단 시스템에 프록시를 두어서 서비스의 투명성을 제공하고 보다 강화된 보안 기능을 갖는 FTP 프록시 보안 모델(FTP-PSM:FTP-Proxy Security Model)을 설계하였다. FTP-PSM은 한 개의 명령어가 입력되고 실행이 끝나는 것이 아니라 계속적으로 사용자 인증 기능 강제적 접근제어 기능 임의적 접근제어 기능 그리고 그룹별 명령어 사용권한 인증 등과 같은 보안 기능을 실행한다. 이러한 보안 기능이 실행되기 위해서 입력된 데이터는 어떤 상황에서도 손실되지 않아야 하므로 실행과정이 무한 루프가 되어 계속 순환하거나 교착 상태가 되는 등의 문제에 대한 안정성을 검증하여야만 한다. 따라서 본 논문에서 제안하는 FTP-PSM은 CPN을 기반으로 한 상태 불변식으로 안정성을 검증하였다.

• Computers and Concrete
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• 제8권6호
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• pp.647-675
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• 2011

Our ability to predict hydration behavior is becoming increasingly relevant to the concrete community as modelers begin to link material performance to the dynamics of material properties and chemistry. At early ages, the properties of concrete are changing rapidly due to chemical transformations that affect mechanical, thermal and transport responses of the composite. At later ages, the resulting, nano-, micro-, meso- and macroscopic structure generated by hydration will control the life-cycle performance of the material in the field. Ultimately, creep, shrinkage, chemical and physical durability, and all manner of mechanical response are linked to hydration. As a way to enable the modeling community to better understand hydration, a review of hydration models is presented offering insights into their mathematical origins and relationships one-to-the-other. The quest for a universal model begins in the 1920's and continues to the present, and is marked by a number of critical milestones. Unfortunately, the origins and physical interpretation of many of the most commonly used models have been lost in their overuse and the trail of citations that vaguely lead to the original manuscripts. To help restore some organization, models were sorted into four categories based primarily on their mathematical and theoretical basis: (1) mass continuity-based, (2) nucleation-based, (3) particle ensembles, and (4) complex multi-physical and simulation environments. This review provides a concise catalogue of models and in most cases enough detail to derive their mathematical form. Furthermore, classes of models are unified by linking them to their theoretical origins, thereby making their derivations and physical interpretations more transparent. Models are also used to fit experimental data so that their characteristics and ability to predict hydration calorimetry curves can be compared. A sort of evolutionary tree showing the progression of models is given along with some insights into the nature of future work yet needed to develop the next generation of cement hydration models.

• 약학회지
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• 제54권4호
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• pp.226-231
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• 2010

Oral fluid has become increasingly popular as an alternative specimen in the field of driving under the influence of drugs (DUID) and work place drug testing. In this study, an analytical method for the detection and quantification of ${\Delta}^9$-tetrahydrocannabinol (THC) and its metabolite, 11-nor-9-carboxy-${\Delta}^9$-tetrahydrocannabinol (THC-COOH) in oral fluid by SPE and GC-MS was established and fully validated. The stability of THC and THC-COOH in oral fluid during storage was also determined by examining the THC and THC-COOH concentration changes depending on time and container materials. Oral fluid samples were kept over 21 days at room temperature, $-4^{\circ}C$ and $-20^{\circ}C$ in two different specimen collection tubes; glass and polypropylene tubes. Three replicates for each condition with different temperature and types of a container were analyzed at five different time points over 21 days. When oral fluid samples were stored in glass tubes, the loss of both THC and THC-COOH was less than 10% at all room temperature, $-4^{\circ}C$ and $-20^{\circ}C$. However, in polypropylene tubes, the loss of both THC and THC-COOH increased significantly over the study period. In particular, the concentration of THC decreased more rapidly than that of THC-COOH at room temperature and the maximal percentage of THC lost was 90.3% after 21 days. The result indicates that it would be necessary to collect oral fluid samples in glass containers and cool the samples until analysis in order to prevent the degradation of analytes.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.426-429
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• 2006

Flood caused by Typhoon and severe rain during summer is the most destructive natural disasters in Korea. Almost every year flood has resulted in a big lost of national infrastructure and loss of civilian lives. It usually takes time and great efforts to estimate the flood-related damages. Government also has pursued proper standard and tool for using state-of-art technologies. High resolution satellite imagery is one of the most promising sources of ground truth information since it provides detailed and current ground information such as building, road, and bare ground. Once high resolution imagery is utilized, it can greatly reduce the amount of field work and cost for flood related damage assessment. The classification of high resolution image is pre-required step to be utilized for the damage assessment. The classified image combined with additional data such as DEM and DSM can help to estimate the flooded areas per each classified land use. This paper applied object-oriented classification scheme to interpret an image not based in a single pixel but in meaningful image objects and their mutual relations. When comparing it with other classification algorithms, object-oriented classification was very effective and accurate. In this paper, IKONOS image is used, but similar level of high resolution Korean KOMPSAT series can be investigated once they are available.

• 한국시조학회지:시조학논총
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• 제26집
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• pp.7-24
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• 2007

흔히 백수 정완영 시인의 작품세계는 동양적 사유세계에 충실하다고 말한다. 그러나 이에 대한 구체적 언급이 없었기 때문에 이 논문에서는 바로 이 점에 대해 알아보려 하였고, 그 결과 다음과 같은 결론을 얻었다. 첫째, 백수 시조에는 작중화자가 자연에 부합하는 존재이면서 자연의 원리 하에 자신을 세우고 자연 속에 동화되어 몰아(沒我)의 경지를 자주 나타내고 있다. 이것은 장자에서 말하는 좌망(坐忘), 불교에서의 지관(止觀) 혹은 정좌(靜坐)와 흡사한 경지라 할 수 있다. 둘째, 백수 시조에는 대립되고 모순되는 것 같은 개념을 서로 상관 개념으로 보려하고 있다. 이는 장자에서는 방생(方生)이라 하고 불교에서는 연기설(緣起說)이라고 한다. 셋째. 백수 시조에는 현실초월 공간에 고향을 설정하고 있는데 이는 장자가 말한 무하유지향(無何有之鄕)의 세계, 불교에서의 공파(空寂)의 세계와 비슷하다. 이렇게 볼 때 그의 시조 속에는 장자나 불교 철학이 깊이 배어 있음을 확인하게 되었다. 그의 작품들은 많은 독자들로부터 사랑을 받고 있는데 그 이유 중의 하나가 바로 이같은 동양적 사유세계를 잘 나타내고 있음에 기인한다고 할 수 있겠다.

• Journal of the Korean Wood Science and Technology
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• 제19권2호
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• pp.56-64
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• 1991

The destructed chips(Pinus rigida Mill) were sulfonated under different conditions and defiberated. The yields and strengths of pulp, fatty acid and resin acid in sulfonated chips were determined. The results of this work were as follows: 1) A sulfonation caused a yield reduction to 97.9~88.2% at single stage. and to 94.9~88.2% at two stage pretreatment. The pulp yields were rapidly draped with increasing cooking temperature from $130^{\circ}C$ to $150^{\circ}C$ 2) Pulp strengths were improved with iacreasing cooking temperature. A sulfonation with 5% $Na_2SO_3$/NaOH(8/2) at single stage and 2% NaOH-5% $Na_2SO_3$ at two stage were most effective and gave the best combination of strength properteis. 3) Fatty acid esters in chips were mostly consisted of palmitic and olleic acid. During a sulfonation the former increased extensively, and the latter was lost with increase of cooking times. The amount of pimaric type in the chips was relatively decreased by the pretreatnent and abietic-type increased. But the changes between two resin acid types were insignificant. 4) The effciency of pitch removal was dependant upon cooking liquor pH. To remove sufficiently the resinous substance, the chips must be sulfonated at over pH 12. Therefore, taking account of pitch removel, two stage sulfonation is considered suitable as reinforcement pulp for newsprint manufacture from pitch pine chips : 2% NaOH($60^{\circ}C$ 1 hr) at first stage and 5% $Na_2SO_3$ ($130^{\circ}C$, 1hr) at secund stage.

• 한국가정과교육학회지
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• 제23권2호
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• pp.89-107
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• 2011

본 연구에서는 기혼자 22명을 대상으로 심층면접을 통하여 기혼자의 '결혼'에 대한 인식을 살펴보았다. 심층 면접 자료를 분석한 결과는 다음과 같다. 1. 기혼자들은 결혼을 통해 얻는 것이 있으면 잃는 것이 있다는 양면을 잘 인식하고 있었다. 즉 결혼을 하면서 잃어버린 자신의 세계에 대한 동경이 있고, 자유로웠던 싱글 시기를 그리워하고 아쉬워하지만, 반면에 결혼을 통해 안정감과 소속감을 얻게 되었고 외롭지 않다고 한다. 2. 기혼자들은 결혼은 경험하지 않으면 모르는 세계라고 인식한다. 싱글은 인생의 간만 보는 것이라면 결혼은 인생의 맛을 보는 것이라고 인식한다. 기혼자들이 결혼의 삶에서 찾아나가는 '맛'은 '가족과 자식의 힘', '인생 고비 뒤의 나를 찾아가는 길', '함께 하는 삶의 즐거움과 편안함', '넓어지는 삶의 폭, 높아지는 삶의 질'이다.

• Asian Pacific Journal of Cancer Prevention
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• 제15권17호
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• pp.7395-7399
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• 2014

Background: Persistent human papillomavirus (HPV) infection, especially with high-risk types such as HPV16 and HPV18, has been identified as the primary cause of cervical cancer. E6 and E7 are the major onco-proteins of high-risk HPVs, which are consistently expressed in HPV infected tissues but absent in normal tissues and represent ideal therapeutic targets for immunotherapy of cervical cancer. Materials and Methods: In this study, the optimized fusion gene HPV18 E6E7 (HPV18 ofE6E7) was constructed according to genetic codon usage for human genes. At the same time, for safety future clinical application, a mutant of HPV18 ofE6E7 fusion gene was generated by site-directed mutagenesis at L52G for the E6 protein and C98G for the E7 protein. Results: HPV18-E6E7 mutant (HPV18 ofmE6E7) constructed in this work not only lost the transformation capability for NIH 3T3 cells and tumorigenicity in BALB/c nude mice, but also maintained very good stability and antigenicity. Conclusion: These results suggest that the mutant should undergo further study for application as a safe antigenspecific therapeutic vaccine for HPV18-associated tumors.

• 한국식물생명공학회:학술대회논문집
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• 한국식물생명공학회 2002년도 춘계학술대회
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• pp.41-47
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• 2002

Adverse environmental conditions such as drought, high salt and cold/freezing are major factors that reduces crop productivity worldwide. According to a survey, 50-80% of the maximum potential yield is lost by these 'environmental or abiotic stresses', which is approximately ten times higher than the loss by biotic stresses. Thus, improving stress-tolerance of crop plants is an important way to improve agricultural productivity. In order to develop such stress-tolerant crop plants, we set out to identify key stress signaling components that can be used to develop commercially viable crop varieties with enhanced stress tolerance. Our primary focus so far has been on the identification of transcription factors that regulate stress responsive gene expression, especially those involved in ABA-mediated stress response. Be sessile, plants have the unique capability to adapt themselves to the abiotic stresses. This adaptive capability is largely dependent on the plant hormone abscisic acid (ABA), whose level increases under various stress conditions, triggering adaptive response. Central to the response is ABA-regulated gene expression, which ultimately leads to physiological changes at the whole plant level. Thus, once identified, it would be possible to enhance stress tolerance of crop plants by manipulating the expression of the factors that mediate ABA-dependent stress response. Here, we present our work on the isolation and functional characterization of the transcription factors.