• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2009.05a
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• pp.200-203
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• 2009

Ultrasonic techniques have the advantage of determining the burning rates with wide range of pressure in only a single test. However, ultrasonic techniques have a drawback, which is that they are using high frequency transducers and it is easily affected by noise. Therefore, ultrasonic measurement method needs noise reduction algorithm to improve or grantee accuracy of burning rate measurements of solid propellants using ultrasound. Thus, in the present study, we propose a noise reduction method of measured ultrasonic signals by applying wavelet shrinkage.

• Journal of the Korea Society of Computer and Information
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• v.17 no.10
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• pp.155-165
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• 2012

This paper suggests traveling salesman problem algorithm that have been unsolved problem with NP-Hard. The proposed algorithm is a heuristic with edge-swap method. The classical method finds the initial solution starts with first node and visits to mostly adjacent nodes then decides the traveling path. This paper selects minimum weight edge for each nodes, then perform Min-Min method that start from minimum weight edge among the selected edges and Min-Max method that starts from maximum weight edges among it. Then we decide tie initial solution to minimum path length between Min-Min and Min-Max method. To get the final optimal solution, we apply previous two-opt to initial solution. Also, we suggest extended 3-opt and 4-opt additionally. For the 7 actual experimental data, this algorithm can be get the optimal solutions of state-of-the-art with fast and correct.

• The Korean Journal of Applied Statistics
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• v.21 no.6
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• pp.923-932
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• 2008

We are likely to face complex multivariate data which can be characterized by having a non-trivial correlation structure. For instance, omitted covariates may simultaneously affect more than one count in clustered data; hence, the modeling of the correlation structure is important for the efficiency of the estimator and the computation of correct standard errors, i.e., valid inference. A standard way to insert dependence among counts is to assume that they share some common unobservable variables. For this assumption, we fitted correlated random effect models considering multilevel model. Estimation was carried out by adopting the semiparametric approach through a finite mixture EM algorithm without parametric assumptions upon the random coefficients distribution.

• Journal of the East Asian Society of Dietary Life
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• v.26 no.5
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• pp.450-456
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• 2016

Allulose, a monosaccharide isomer of fructose, was evaluated as a sucrose replacer for healthy cookie production with benefits such as low glycemic impact and low calorie content. Sucrose (as a reference), fructose, glucose, and allulose were used to explore the effects of sugar-replacer type on solvent retention capacity (SRC), differential scanning calorimetry (DSC), rapid visco-analyzer (RVA), and wire-cut cookie baking. SRC results indicated the lowest swelling of solvent-accessible arabinoxylans in allulose compared to that in other sugar solutions. DSC and RVA results showed retardation of starch gelatinization and onset of starch pasting, respectively, in the following order: water < allulose < fructose < glucose < sucrose. Among sugars, wire-cut cookies formulated with glucose showed the least desirable attributes with respect to cookie diameter and thickness. Although the baking response of allulose was slightly inferior to that of the sucrose control, the sugar exhibited a superior baking response to that of fructose, suggesting it could be used successfully as a fructose alternative or sucrose alternative for producing wire-cut cookies with reduced calorie content and low glycemic impact.

• (The)Study of the Eastern Classic
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• no.36
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• pp.135-161
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• 2009

"논어"는 진시황(秦始皇)의 "분서갱유(焚書坑儒)"로 크게 손실되었다가 한대(漢代)에 이르러 크게 "노론(魯論)", "제론(齊論)", "고론(古論)" 등 3개의 다른 판본이 출현하였다. "노론(魯論)"과 "제론(齊論)"은 각기 다른 사승관계에 의해 전수되어 오다 장우(張禹)에 의해 두 본이 하나로 합쳐지게 되었고, 이후 세상에서 널리 읽혀지게 되었다. 20세기(世紀) 말, 돈황(敦煌)과 토노번(吐魯番)에서 수많은 당사본(唐寫本)들이 발견되었는데, 그 중에 정현(鄭玄)의 "논어주(論語注)"와 하안(何晏)의 "논어집해(論語集解)" 등이 포함되어 있었다. 또한 1973년 서한(西漢) 중산(中山) 회왕(懷王) 유수(劉修)의 무덤에서도 죽간(竹簡)에 쓰여진 "논어(論語)"가 출토되었다. 본고에서는 현재 "논어" 판본 중에서 가장 이른 시기에 속하는 이들 3개의 출토문헌 자료와 전래본인 주자(朱子)의 "논어집주(論語集注)"의 비교를 통하여 한위(漢魏)시기 이래로 여러 "논어"본들이 정리되어가는 과정과 그 과정에서 파생된 제반 문제들을 살펴보았다. 이를 통하여 여러 판본들의 공통점과 차이점들을 살펴볼 수 있었고, 또한 한나라 이후 꾸준히 논란이 되어 왔던 내용과 이를 바탕으로 전래본에서 수정 보완된 부분들을 발견할 수 있었다. 기존 한국의 "논어" 연구는 후대의 전래본을 중심으로 그 철학적인 사상을 분석하는데 편중되어 왔다. 이들 연구는 상당부분 후대에 가미된 글자와 내용을 논어의 원문으로 오인하고, 이를 통해 추론해 낸 결론들도 원래의 사실과 거리가 있을 수밖에 없었다. 그러므로 우리는 20세기 이래로, 고고학적 발굴 성과에 힘입어 지하에서 출토되는 새로운 자료들에 대해 주위를 기울일 필요가 있다. 특히 최근에 출토되는 간독(簡牘)자료에 수많은 경전관련 자료들이 포함되어 있다. 이러한 일차 자료들을 정리분석하고 이를 토대로 그 안에 내재되어 있는 경학, 철학, 역사적인 의미 등을 추론해 낸다면 좀 더 근본적으로 고대사회의 정신문명을 이해할 수 있으리라 본다. 따라서 본 연구는 이러한 방향에서 "논어" 연구의 올바른 토대를 마련하기 위한 기초적 작업으로서의 의의가 있다고 하겠다.

• International Area Studies Review
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• v.15 no.3
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• pp.451-470
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• 2011

Many countries are committed to absorb foreign direct investments (FDIs). One of the strong motivations is the improvement of innovative capability through the technology spillover of FDI firms. The effect of FDI technology spillover has been widely researched not only on country level, but industry level. With the evolution of globalization and global sourcing of multinational companies, it is necessary to reexamine the relationship between innovation ability of an industry and spillover effect of FDI. This paper investigates the technology spillover effect of FDI on the innovation of Chinese firms. We gathered the data of 34 industries form various sources of Chinese government and the time span is 2001-2008. By using industry level panel data, we set panel data analysis model. In the model, there are two explanatory variables: backward and foreward integration. The analysis result shows that technology spillover of FDI has significant effect on the innovation of foreward integration FDI.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.21 no.5
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• pp.83-94
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• 2011

Yoking proof is a concept proposed by A. Juels in 2004. It proves that a pair of tags are scanned simultaneously by one reader. After the first yoking proof protocol is proposed by A. Juels, replay attack vulnerabilities of yoking proof are considered and many other yoking proof schemes are proposed to improve it. However, compared with the first yoking proof scheme which emphasizes protocol efficiency due to the limited performance of tags, other yoking proof protocols need more computing power and storage of the tags. We propose two security protocols that consider both the general condition and limited performance of tags. The proposed scheme can protect the tags from replay attack and Brute-force attack as well. Moreover, many pairs of tags or several tag groups can be proved at the same time by executing the protocol only once.

• Korean Journal of Environment and Ecology
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• v.31 no.6
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• pp.529-536
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• 2017

The study is intended to investigate the proliferation of whitening, the impact of climate change (sea temperature rise) on the proliferation of whitening, and the reproduction and growth of crustose coralline algae, which causes the whitening, in the coast of Jeju Island. The size of the whitening-affected area in the coast of Jeju was 2,931ha in 1998 and increased to 4,541ha in 2003. The whitening occurred mainly in the southern coast of Jeju in 1998 but spread across the whole coast of Jeju by 2003, except in the coast of Jocheon-eup (eup refers to an administrative district in Korea) and Gujwa-eup. The average sea water temperature in February from 1992 to 2004 was $15.1^{\circ}C$ in the whitening affected area and $13.9^{\circ}C$ in the marine forest area, showing a clear difference, but there was no difference in the average temperature in August. The long-term (37-year period) average of the sea temperature was $15.3^{\circ}C$ in the whitening affected area and $14.1^{\circ}C$ in the marine forest area, showing $1.2^{\circ}C$ higher in the whitening area. The annual rate of sea temperature rise was $0.038^{\circ}C$ in the whitening area and $0.024^{\circ}C$ in the marine forest area, indicating the higher long-term variation of sea temperature in the water affected by whitening. The results indicate that the continuous increase in winter water temperature due to climate change is expanding proliferation of whitening in the Jeju island.

• Journal of Nutrition and Health
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• v.26 no.2
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• pp.156-163
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• 1993

This study was carried out to investigate accumulation of metallothionein(MT) in rat liver and kidney by cadmium administration. After male rats of Sprague-Dawley strain weighing 60$\pm$5g were fed basal diet ad libitum for 4 weeks, two types of experiments were performed. In the first set of experiment, rats were divided into five groups. Control groups was fed basal diet without injection of cadmium. Dose groups of A, B, C and D were i.p. injected 0.625, 1.25, 2.5, 5mg Cd/Kg of body wt, once a day for two days. In the second set of experiment, rats were also divided into five groups. Control group was fed basal diet without injection of cadmium. Number groups of I, II, III and IV were i.p. injected 1, 2, 3, and 4 times every 24hrs, respectively and injection doses were 2.5mg Cd/Kg of body wt. in a day. In the first of experiment, hemoglobin contents in C, D groups were lower than control group. MT concentrations in liver and kidney were increased with increasing Cd injection doses to 2.5mg Cd/Kg of body wt. Liver - SH group values in C, D groups were higher than control group. Hematocrit values did not differ among groups. In the second of experiment, hemoglobin contents and hematocrit values were decreased. MT concentration in liver and kidney were progressively increased with increasing number of Cd injection. In both sets of experiments, liver MT concentrations were higher than kidney.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.30 no.3
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• pp.325-336
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• 2020

Nonlinear Invariant Attack is an attack that should be considered when constructing lightweight block ciphers with relatively simple key schedule. A shortcut to prove a block cipher's resistance against nonlinear invariant attack is checking the smallest dimension of linear layer-invariant linear subspace which contains all known differences between round keys is equal to the block size. In this paper, we presents the following results. We identify the structure and number of optimal bit-permutations which require only one known difference between round keys for a designer to show that the corresponding block cipher is resistant against nonlinear invariant attack. Moreover, we show that PRESENT-like block ciphers need at least two known differences between round keys by checking all PRESENT-like bit-permutations. Additionally, we verify that the variants of PRESENT-like bit-permutations requiring the only two known differences between round keys do not conflict with the resistance against differential attack by comparing the best differential trails. Finally, through the distribution of the invariant factors of all bit-permutations that maintain BOGI logic with GIFT S-box, GIFT-variant block ciphers require at least 8 known differences between round keys for the resistance.