• Annual Conference of KIPS
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• 2007.11a
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• pp.286-289
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• 2007

PC 및 서버 급에서 DBMS가 아주 폭넓게 사용되어지고 있으며 그 뿐 아니라 컴퓨팅 파워가 높아짐에 따라서 임베디드 시스템에서도 DBMS가 필요해졌다. 임베디드 시스템에서 DBMS가 충분히 동작할 만큼의 성능을 발휘하게 되었고, 이에 따라 임베디드 시스템에서 동작하는 응용프로그램들도 임베디드 DBMS를 사용하게 되었다. 임베디드 시스템이 점차 플래시 메모리를 사용하는 추세에 맞추어 플래시 기반 임베디드 DBMS 기술 개발이 중요하다. 플래시 메모리의 특성에 맞춘 임베디드 DBMS를 개발하지 않으면, 결과적으로 플래시 메모리의 성능을 저하시키며, 수명도 단축시키는 결과를 초래하게 될 것이다. 특히 임베디드 환경에서는 전기 에너지 자원이 한정되어 있기 때문에 전력 소모를 줄이는 것이 관건이다. 따라서 임베디드 DBMS에서 디스크에서 정의한 비용 모델을 따르는 것은 한계가 있다. 본 논문은 임베디드 DBMS에서 전력 기반 비용 모델을 새롭게 제시하고, 디스크 기반 비용 모델과 비교하여 제시한 비용 모델과의 차이를 보인다.

• 한국벤처창업학회:학술대회논문집
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• 2024.04a
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• pp.81-97
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• 2024

본 연구는 디지털 트랜스포메이션 맥락에서 기업의 경쟁우위와 생존을 도모하기 위해 양손잡이 역량의 다양한 차원을 구현하고 기업수준의 혁신에 기여하기 위한 목적으로 수행되었다. 디지털 기술의 이니셔티브인 디지털 기술 역량이 조직의 다차원(균형적, 결합된 차원)적 양손잡이 역량에 미치는 관계에서, 변환관리의 핵심 역량인 디지털 리더십 역량의 상세요인들(디지털 비전, 디지털 HR 스킬, 디지털 거버넌스, 협력방식)이 갖는 매개효과를 중심으로 검증하였다. 연구의 진행을 위해 국내 제조업과 ICT & 통신업에 종사하는 250명의 중소기업 관리자를 대상으로 설문조사를 실시한 데이터를 활용하였으며, 연구방법으로는 R을 GUI 방식으로 구현한 오픈소스 통계 툴(Tool)인 Jamovi 2.3.26의 응용프로그램을 사용하여 회귀분석을 실시한다. 본 연구는, 디지털 트랜스포메이션 맥락에서 조직 내 긴장을 관리하고 갈등을 해소하는 다차원 양손잡이 역량에 대한 운영방안과 리더십의 역할에 대한 기존지식의 범위를 확장하며, 조직이 속한 산업 환경과 처한 성황에 따라 적절한 양손잡이 역량과 리더십 역량을 사용할 수 있는 최적화된 방안을 제시한다. 또한 디지털 트랜스포메이션 맥락에서 조직이 양손잡이 역량을 도입하고자 할 때, 기술적 이니셔티브에 대한 투자도 물론 중요하지만, 리더십 역량이 가지는 세부요인 의한 양손잡이 역량을 달성함으로써, 더욱 효과적인 디지털 트랜스포메이션을 달성할 수 있다는 기여를 제공할 예정이다

• Journal of the Korea institute for structural maintenance and inspection
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• v.12 no.5
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• pp.179-189
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• 2008

The object of this study is to develope a program with proposed numerical techniques for an optimal seismic control of structures using active tendon systems. Ricatti closed-loop algorithm has been applied to control the active tendon systems with time-delay problem. The optimal control is formulated as an optimization problem which is finding optimal weighting matrices by minimizing the quadratic performance index by SUMT. In order to find the optimal location of active tendons in structures, controllability index has been introduced. From numerical examples, the current optimal control technique with optimal location of tendons was suitable to control the seismic response of structures.

• Industry Promotion Research
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• v.5 no.4
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• pp.55-61
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• 2020

In conducting school violence counseling to solve school violence, this study studied the use of school violence counseling to solve school violence by forming a correct peer relationship. Through this study, we can see that peer relations are an important factor in preventing school violence in school violence counseling. The findings are as follows. First, school violence counseling should first protect and heal victims. The primary goal of school violence counseling should begin with consideration for the victims and be placed on the continuation of the victim's right peer relationship. That's how important peer relationships are. Second, not only victims of school violence counseling, but also perpetrators should be included in the list of counsels. In other words, there may be many cases where counseling is usually focused only on the victim. Therefore, the peer relationship can continue even after school violence, so customized counseling is needed not only for victims but also for perpetrators. Third, for school violence counseling, the recovery of peer relations and insight into life are important. Therefore, the focus should be on self-reflection and the restoration of relations between the parties, not on a disciplined or disciplined, controlled perspective. Fourth, we should recognize the importance of peer relations in school violence and activate the 'old counseling program'. Therefore, school violence counselors should optimize their programs by reflecting on-site needs so that they can act as emotional facilitators, problem solvers, and empathic cultural promoters in their roles. In conclusion, school violence counseling should basically be involved in peer relationships. School violence counseling should develop and implement programs focusing on the formation of proper peer relations in order to eradicate school violence.

• Journal of the Korean Institute of Telematics and Electronics C
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• v.35C no.12
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• pp.1-12
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• 1998

In this paper, a design and implementation of VHDL-to-C mapping in the VHDL compiler back-end is described. The analyzed data in an intermediate format(IF), produced by the compiler front-end, is transformed into a C-code model of VHDL semantics by the VHDL-to-C mapper. The C-code model for VHDL semantics is based on a functional template, including declaration, elaboration, initialization and execution parts. The mapping is carried out by utilizing C mapping templates of 129 types classified by mapping units and functional semantics, and iterative algorithms, which are combined with terminal information, to produce C codes. In order to generate the C program, the C codes are output to the functional template either directly or by combining the higher mapping result with intermediate mapping codes in the data queue. In experiments, it is shown that the VHDL-to-C mapper could completely deal with the VHDL analyzed programs from the compiler front-end, which deal with about 96% of major VHDL syntactic programs in the Validation Suite. As for the performance, it is found that the code size of VHDL-to-C is less than that of interpreter and worse than direct code compiler of which generated code is increased more rapidly with the size of VHDL design, and that the VHDL-to-C timing overhead is needed to be improved by the optimized implementation of mapping mechanism.

• Fire Science and Engineering
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• v.34 no.3
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• pp.134-140
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• 2020

Nuclear power plants (NPPs) in Korea are required to be maintained using a defense in-depth approach to prevent leakage of radioactive substances outside the plant and allow safe shutdown in the event of a fire. Periodic testing must be conducted to ensure that the fire protection facilities perform as required by the laws for various nuclear reactor types. In June 2017, for the first time in Korea, a nuclear plant, Kori Unit 1, was permanently shut down. It was prepared for decommissioning in accordance with the fire protection regulations imposed by the regulatory body. However, a standard protocol is necessary for systematically establishing the fire protection program for decommissioning of NPPs in the future. Therefore, the nuclear legal systems of countries with many operating nuclear power plants, such as the United States, Japan, Canada, and various European countries, were reviewed and guidelines for establishing a fire protection program for decommissioning NPPs was suggested; the fire protection requirements stated by Reg Guide 1.191 (Decommissioning fire protection program for NPPs during decommissioning and permanent shutdown) were used as a model. Suggestions for establishing legal regulations to optimize fire protection programs and secure basic technology for decommissioning NPPs were also made.

• Journal of the Korean Society of Radiology
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• v.13 no.3
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• pp.453-458
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• 2019

In this study we analyzed the tendency of the image characteristic by changing filtering factor for the proposed fast non local means (FNLM) noise reduction algorithm with designed Male Adult mesh (MASH) phantom through Geant4 application for tomographic emission (GATE) simulation program. To accomplish this purpose, MASH phantom for human copy was designed through the GATE simulation program. In addition, we acquired degraded image by adding Gaussian noise with a value of 0.005 using the MATALB program in MASH phantom. Moreover, in degraded image, the FNLM noise reduction algorithm was applied by changing the filtering factors, which set to 0.005, 0.01, 0.05, 0.1, 0.5, and 1.0 value, respectively. To quantitatively evaluate, the coefficient of variation (COV), signal to noise ratio (SNR), and contrast to noise ratio (CNR) were calculated in reconstructed images. Results of the COV, SNR and CNR were most improved in image with a filtering factor of 0.05 value. Especially, the COV was decreased with increasing filtering factor, and showed nearly constant values after 0.05 value of the filtering factor. In addition, SNR and CNR were showed that improvement with increasing filtering factor, and deterioration after 0.05 value of the filtering factor. In conclusion, we demonstrated the significance of setting the filtering factor when applying the FNLM noise reduction algorithm in degraded image.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.34 no.5
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• pp.973-980
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• 2024

Fuzzing is an automated testing technique that generates a lot of testcases and monitors for exceptions to test a program. Recently, fuzzing research using machine learning has been actively proposed to solve various problems in the fuzzing process, but a comprehensive evaluation of fuzzing research using machine learning is lacking. In this paper, we analyze recent research that applies machine learning to scheduling techniques for fuzzing, categorizing them into reinforcement learning-based and supervised learning-based fuzzers. We evaluated the coverage performance of the analyzed machine learning-based fuzzers against real-world programs with four different file formats and bug detection performance against the LAVA-M dataset. The results showed that AFL-HIER, which applied seed clustering and seed scheduling with reinforcement learning outperformed in coverage and bug detection. In the case of supervised learning, it showed high coverage on tcpdumps with high code complexity, and its superior bug detection performance when applied to hybrid fuzzing. This research shows that performance of machine learning-based fuzzer is better when both machine learning and additional fuzzing techniques are used to optimize the fuzzing process. Future research is needed on practical and robust machine learning-based fuzzing techniques that can be effectively applied to programs that handle various input formats.

• Journal of the Korean Society of Earth Science Education
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• v.9 no.2
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• pp.199-216
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• 2016

The purpose of this study is to figure out how much gifted science education teachers in charge of the class realize the necessity of individualized curriculum and program for scientifically gifted, to find out the problems of the gifted science educational institutions from exploring them in depth in the light of the reality in the gifted science educational institutions, and to draw implications about the applicable direction of more aggressive individualized curriculum and program for scientifically gifted. I chose 15 people with the incumbent teachers who have ever taught scientifically gifted and have a degree in the gifted education or science subject education as study participants and had a depth interview with them. According to result of the study, 14 of 15 study participants recognized the necessity of individualized education in science should understand the personal requirements according to the tendency of the gifted students and should be a study led by students themselves. Of the problems in gifted science education, teachers regarded the reduction in the financial support as the biggest problem and the vocation and professionalism of teachers were referred as a very important factor. With constraints of time and space, there were plenty of opinions that can't ignore the influence of educational environment associated with the university entrance examination. There were many opinions that there is excessive expansion of the agencies and the target for gifted students, no standardized measurement tools and programs and the lack of the system for the coherent observation as a teacher. Also, the unified curriculum of gifted science education institutions were pointed out as the problem and the individualized programs which were already under way have a lot of weakness and being offered marginally. Thus, from now on, to apply for individualized education of gifted science, teachers demanded optimized education conditions and consistent policy support, and expressed the opinion that there needs of a possible continuous observation system. Besides, the curriculum and programs matched the needs of the students should be taken priority the most, and there were another answers that fellow learning within the cooperative learning can be an alternative of the individualized. Along with that, there were lots of opinions that the treatment to overcome an inferiority complex according to the individualized should be followed.

• Journal of the Korean Society of Food Science and Nutrition
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• v.44 no.4
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• pp.592-601
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• 2015

Rubus coreanus is known as Korean black raspberry, native to Korea, Japan, and China. Preliminary studies evaluating their potential for cancer treatment in mammalian test systems are ongoing. In recent years, interest has been renewed due to their high levels of anthocyanins. Anthocyanins in black raspberry are important due to their potential health benefits as dietary antioxidant, anti-inflammatory compound, and as a chemopreventive agent. In the present study, Saccharomyces cerevisiae BA29 was isolated from black raspberry fruit and fruit juice as a biogenic amine non-producing strain for manufacturing of black raspberry wine, after which we investigated its characteristics: biogenic amine-producing ability, cell growth ability, alcohol-fermentation ability, and resistance to alcohol, glucose, and sulfur dioxide. Based on preliminary experiments, we optimized culture medium compositions for improving dried cell weight of S. cerevisiae BA29 by response surface methodology (RSM) as a statistical method. Design for RSM used a central composite design, and molasses with the industrial applicability was used as a carbon source. Through statistical analysis, we obtained optimum values as follows: molasses 200 g/L, peptone 30 g/L, and yeast extract 40 g/L. For the model verification, we confirmed about 3-fold improvement of dried cell weight from 6.39 to 20.9167 g/L compared to basal yeast peptone dextrose medium. Finally, we manufactured black raspberry wine using S. cerevisiae BA29 and produced alcohol of 20.33%. In conclusion, S. cerevisiae isolated from black raspberry fruit and juices has a great potential in the fermentation of black raspberry wine.