블루투스를 통한 자동차 해킹 위협에 대한 예상과 대응방안에 대한 연구

권구환 ( Ku-hwan Kwon ),이근호 ( Keun-ho Lee ) 한국정보처리학회 2015 한국정보처리학회 학술대회논문집 Vol.22 No.1

해킹의 범위가 넓어지고 있는 현 시대에는 컴퓨터 통신 장비만을 해킹 하던 과거와 달리 우리가 살고 있는 21세기에는 컴퓨터 시스템에 한정되지 않고 인간이 사용하는 모든 장비에 통신시스템이 설계되면서 해킹이 가능한 장비들의 범주가 증가하고 있고 인간이 사용하는 모든 통신장비를 해킹하는 사례가 증가하는 추세이다. 특히 스마트 동차가 나오기 시작하면서 스마트 자동차에 대한 해킹의 위험이 높아지고 있는 상황이다. 블루투스에 대한 보안적인 요소들과 보안 취약점 및 대응방안에 대하여 제안하였다.

DMR 프로토콜용 전용칩의 설계 및 구현

김구환(Ku-Hwan Kim),황민태(Min-Tae Hwang),이정태(Jung-Tae Lee) 한국정보과학회 1994 한국정보과학회 학술발표논문집 Vol.21 No.2B

앞으로의 통신망은 신뢰성이 높고 고속의 광통신 기술을 바탕으로 한 광대역 종합정보통신망으로 발전할 것이며, LAN/MAN 환경에서는 다수의 가입자가 전송 매체를 공유하는 다중접속 프로토콜의 활용이 두드러질 것이다. 현재 활발히 연구되고 있는 다중접속 프로토콜에는 FDDI-Ⅱ, DODB 및 ATMR 프로토콜등이 있는데 이들 프로토콜은 제각기 문제점들을 안고 있다. 따라서 이들 문제를 해결하면서 우수한 성능을 지닌 DMR(Dynamic Monitor Ring) 프로토콜이 제안된 바 있다. 본 논문에서는 이미 제안된 DMR 프로토콜용 전용칩을 VHDL과 Powerview 5.1을 이용하여 설계하고, 이를 ALS 2.11을 이용하여 FPGA화 한 다음 DMR 프로토콜 보드로 구현하였다.

DMR 프로토콜의 설계 및 구현

황민태(Min-Tae Hwang),김구환(Ku-Hwan Kim),이정태(Jung-Tae Lee) 한국정보과학회 1994 한국정보과학회 학술발표논문집 Vol.21 No.1

ISO에서 표준화중인 ATMR 프로토콜은 동시성 트래픽의 최대 전달 지연을 일정치 이하로 유지시키지 못하는 점과 노드 수에 제한이 따르는 문제점이 있다. 이러한 문제점을 해결하기 위하여 본 논문에서는 DMR 프로토콜을 제안하고 전용 칩을 설계하여 구현하였다. DMR 프로토콜의 전용 칩은 VHDL로 설계하고 Actel 칩으로 구현하였다.

회전익 항공기용 주구동축의 커플링 설계 및 해석

박태영(Tae Young Park),이세훈(Se Hoon Lee),김상훈(Sang Hoon Kim),박구환(Ku Hwan Park),박연수(Youn Su Park) 한국추진공학회 2022 한국추진공학회 학술대회논문집 Vol.2022 No.11

콩 유전자원의 지방함량과 지방산조성 평가 및 유용자원의 선발

송항림(Hang-Lin Song),장은규(Eun Kyu Jang),손은호(Eun Ho Son),이구환(Ku Hwan Lee),황세구(Se Gu Hwang),윤건식(Geon Sig Yun),이정동(Jeong-Dong Lee),김홍식(Hong Sig Kim) 한국육종학회 2015 한국육종학회지 Vol.47 No.3

This study was carried out to evaluate the oil contents and fatty acid compositions of 379 soybean germplasm accessions which is composed of 128 Korean, 214 Chinese and 37 USA accessions, and to select useful resources for the development of high oil content and quality fatty acid varieties in soybean. Korean and Chinese germplasm accessions were obtained from the National Agrobiodiversity Center, National Academy of Agricultural Science, Rural Development Administration, and USA accessions from the Plant Genetics and Breeding Laboratory of Kyungpook National University, Korea. The oil content ranges from 12.7∼26.0% with an average of 19.1% among accessions. The average contents and ranges of palmitic and stearic acid, saturated fatty acids (SFA), were 10.6% with a range of 4.1∼18.1% and 2.9% with a range of 1.9∼12.7% respectively, while those of oleic, linoleic and linolenic acid, unsaturated fatty acids (USFA), were 28.2% with a range of 15.3∼56%, 51.2% with a range of 24.4∼68% and 7.1% with a range of 3.4∼11.1% respectively. The average linoleic(ω-6)/linolenic(ω-3) acid ratio was 7.5 ranging from 3.8∼17, and the average SFA and USFA contents were 13.5% ranging from 6.7∼21.7% and 86.5% ranging 78.3∼93.4% respectively. Accessions with better essential properties were selected as useful resources for the development of high oil content and quality fatty acid varieties. Three accessions, Suinong 14, Dongnong 434 and Dongnong 46 from China contain oil higher than 25.0%, while five accessions including KLG 12073 and KLG 12074 from USA, Jilin 14 from China, Kwangan and Bongeui from Korea contain oleic acid higher than 50%. Eight accessions including KLG12083 and KLG12081 from USA contain linoleic acid higher than 60%. Seven accessions including KLG 12093 and KLG12096 from USA contain linolenic acid lower than 4%. Five accessions, KLG12074 and KLG12073 from USA, Kwangan and Bongeui from Korea, and Dongnong 47 from China were low linoleic acid(ω-6)/linolenic(ω-3) ratio resources with lower than 4.5.

複合運送條件의 등장에 따른 貿易慣習의 發展展望

李龜喚,崔斗壽 新羅大學校 1987 論文集 Vol.23 No.-

After world war Ⅱ, with the container revolution the combined transport system appeared, then many problems were brought out in the field of transportation of goods which had no great significance in the earlier times. To cope with them the International Chamber of Commerce (ICC) has come to codify 「Incoterms 1980」after many times amendments, which includes trade terms-FRC·DCP·CIP, used for the contracts of Sale based on the combined transport system. In this thesis, I lightened the essence of FRC·DCP·CIP contracts, the main issues in the performance of the contracts, that is, property transfer and passing of risk from view point of jurisprudence. Under FRC contract the seller and buyer become exporter and consignor respectively, under DCP·CIP contract the seller becomes exporter and consignor, arranges the contracts of transport and insurance, and pays freight and insurance costs as under CFR·CIF contracts. But the characteristics of FRC·DCP·CIP contracts in the light of transport system depended upon the course of contacts performance. Under the former contracts the extent of obligation on all costs and the time of property transfer and passing of risk are defined by the concept-under the custody of the first carrier, which is compared with that-ship's rail under the latter contracts. The amounts of trade by the combined transport system is on the increase, but the adoptation of FRC·DCP·CIP terms is seldom, therefore the countermeasures and improvements are required. Firstly, the United Nations Convention in International Multimodel Transport of Goods(1980) should come into effect and new insurance system for the combined transport system be enacted. Secondly, combined transport document, insurance policy should be characterized by negotiability and document of title, which enable the buyer to the price of goods by documentary bill of exchange. Then the benefit of finance would be guarantees /by use of the evidential documents. Thirdly, the FRC·DCP·CIP usages should be developed with the accumulation of trade customs and juridical precedents.

私敎育費의 生産性에 關한 分析

李龜喚 新羅大學校 1985 論文集 Vol.18 No.-

Recognition of the importance of human capital in productivity and economic growth was one of major achievements in economic analysis the late of 1950s, because the critical role of human capital in the wealth of nations was not known to former economists but could not be explained or many economists in productivity and economic growth. Then, human capital was constituted by schooling expenditure. Schooling expenditure consists of two parts. One is goverment input and the other is household input. To investigate the productivity of Korean household expenditure in this paper, the writer applied the basic equation of R. B. freeman and obtained the following equation. Namely, the equation was obtained by differentiating an production which, in the special case, relates output(Y) to household schooling expenditure(E) : Y=F(E)……………………………………………………① Differentiation of the above equation ① with respect to household schooling expenditure inputs yields as follows : dY=FedE=WedE…………………………………………② The above Fe is the marginal product of household schooling expenditure in puts, which in a certain case can equal the relevant wage(We). In percentage or log change form, the above equation ② can be written in informative way: Y=FedE/Y………………………………………………③ or as Y=aeE……………………………………………………④ In the above equation ③, growth becomes larger to the extent that the share of national product allotted to net investment in household schooling expenditure (dE/Y) becomes larger, or the return or productivity of this investment, Fe, dose so. In the above equation ④, growth is explained in terms of the rate of increase in the stock of household schooling expenditure and in its productivity measured by the share of national income earned by the form of capital [ae=(WeE)/Y]. Using the above formulation, the writer analyzed the effect of this type of investment on economic growth examining the trends in the share of national product devoted to the investment of education and by examining the trends in its rats of return or productivity. The conductivity of analysis is as follows: 1. The marginal productivity of city household schooling expenditure is 1.00, whereas the effect of farm household is 0.98. 2. The net investment of city household schooling expenditure is 23.09, and the farm household schooling expenditure is 26.50 in the net increase. 3. The net increase of city household income come to 19.10 and then, the farm household income come to 43.62 in the net increase. 4. During the above measuring time, the economic growth come to 25.78. According to 1, 2, 3, and 4, the writer obtained the conculusion of calculation as follows. A: In case of the household income, 1. The noneffect in city household schooling expenditure is 4.08. 2. The effect in farm household schooling expenditure is 17.65. B: In case of the economic growth, 1. The effect in city household schooling expenditure is 2.69. 2. The noneffect in farm household schooling expenditure is 0.19.

고등학교 私敎育費의 효율성 평가

이구환 부산여자대학교 사회과학연구소 1997 사회과학연구 Vol.- No.1

It is that high school in Korea have been developed so far rather quantitatively than qualitatively. Changes an expression in a differnt way, the number of high school students are increased to have estimated about 1.0% annually from 1975 to 1995, and the tuition & fees of high school education has also increased without any qualitative improvements accompanied. In particularly, the high school tuition & fees are estimated to have increased about 13.0% every year from 1975 to 1995. This means that the high school tuition & fees which has been imposed on the students household fall heavily on the parents of students in Korea. Meanwhile the high school graduates has been increased about 4.6% every year from 1975 to 1995, and on the contrary the jobless high school graduates was estimated to have decreased about 3.0% annually within a given period of the same time. But there is an unemployment problem of the high school graduates because it is ture that an increasing rate of the graduate students has been exceed a decreasing rate of the jobless high school graduates. In this regard, the present study valuates the tuition & fees that was imposed on the households of high school students with a view to seeming if the amount of the high school tuition & fees are reasonable. First, the real tuition & fees of high school correlated with the real wages of the high school graduates in the higher level, the correlate parameter was estimated 0.94 per year from 1978 to 1993. Second, this valuation adops S. Bowles'model and A. Okun'Law. And then, the result of the analysis shows that the efficiency of the high school tuition & fees per month was valuated the average parameter of 0.43 per year from 1978 to 1993. Third, the high school tuition & fees had positively affected about 0.1% per year the economical production from 1978 to 1992 and efficidency of the high school tuition & fees are estimated to have been improvemented about 43.3% per year annually within the same period. But the efficiency of the high school tuition & fees has been negative alt but one year, and so it is quite possible as we have guessed that the high school tuition & fees has negatively effected on the economical production so far.

專門大學 私敎育費의 效率性 分析

李龜喚 新羅大學校 1995 論文集 Vol.39 No.1

It is ture that junior college in Korea have been developed so far rather quantitatively than qualitatively. The number of junior college students has increased annually, and the cost of junior college education has also increased without any qualitative improvements accompanied. The registration fees are estimated to have increased about 3.1% every year from 1975 to 1992. This means that the large portion of the budget cost of junior college education has been imposed on the students households. The private junior college account of about 94% of all the junior college in Korea, and about 81.4% of the expenditures of the private junior college comes from the registration fees in 1991. On the contrary, the unemployment rate of the graduate is estimated to have increased about 14.1% annually from 1975 to 1992. In this regard, the present study analyzes the educational expenses imposed on the households of junior college students with a view to seeing if the amount of the household educational expense is reasonable. This analysis adopts S. Bowles' model and A. Oken' Law. The result of the analysis shows that the efficiency of the household educational expenses increased by the average parameters of 4,039 per year from 1987 to 1990. but the parameters are negative influence from 1978 to 1987. All this means that the present amount of household educational expenses should be reconsidered into a proper direction. Most of all, the government is highly required to immediately take an appropriate policy to correct the present unreasonable household educational expenses.

敎育需要 要因의 經濟的 效果에 關한 硏究

李龜喚 新羅大學校 1985 論文集 Vol.20 No.-

Economic development is usually identified with the increased of G.N.P and capital formation connected directly with the net increase of land, structure, commodity, stocks and foreign clains, etc. The increase of G.N.P. is driving at capital formation. The usual concept of capital formation for economic development misses the important productivity factor of human capital. Because it is now increasingly realized that amassive injection of material into-production will not necessarily explain a successful productivity unless that country already possesses a suitable human capital. Human capital is built of educational investment which is related to the physical capital. Many statistical investigations identified this reality. Of late years, a great crowd of economists studing an the problem of economic development have turned their attention towards human capital. Thereupon, this paper has dealt with the fact that educational investment affects physical capital and employment. The qualitative increment of human capital will increase the productivity but excessive expenditure on human capital will squander a physical capital. In designing a strategy of human capital for economic development, one needs to consider the level of educational investment because educational investment of developing countries will be accasionaly made or marred by investment level and direction.