• Convergence Security Journal
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• v.16 no.5
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• pp.49-55
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• 2016

Recently mobile service industry has grown very rapidly. In this paper, We investigated the changes in mobile service network as well as security vulnerabilities of network in future 5G mobile service network, too. Recently, there are rapid developement of information and communication and rapid growth of mobile e-business users. Therefore We try to solve security problem on the internet environment which charges from wire internet to wireless internet or wire/wireless internet. Since the wireless mobile environment is limited, researches such as small size, end-to-end and privacy security are performed by many people. In addition, there is a need of internetworking between mobile and IoT services. Wireless Application Protocol has weakness of leaking out information from Gateway which connected wire and wireless communication. As such, We investigate the structure of mobile service network in order to gain security vulnerabilities and insights in this paper.

• Journal of the Korean earth science society
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• v.25 no.8
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• pp.663-673
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• 2004

This study has developed an interactive WBI to enhance learning effects on 'the Moon motion' for middle-school students. The quality of this examined by applying it to 20 science teachers and 49 middle school students 49. As a result, over 85% of the test subjects gave an affirmative response in the interest induction, the curiosity solving, and the degree of learning participation category, the degree of difficulty item. Response of the students with negative perception on science have changed positively(p<.05) after this WBI learning. In addition, we compared the learners' of knowledge prior and subsequent to 'the Moon motion'. As a result, it was found that the case of 'no concept' was enhanced more than the case having 'partly or ambiguously concept' for 'the Moon motion'.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.2
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• pp.179-184
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• 2016

The electrical load testing system developed from this study was designed to control rated-capacity-testing or variable-load-testing in an active and precise manner and save electric energy during testing, and also to convert the saved electric energy through the electrical load testing system to grid line. As for the device under testing, it was designed to be applied to not only transformer, rectifier, voltage regulator, inverter which require grid voltage source but, also applied to electric power, aerogenerator, photovoltaic, hybrid generator, battery, etc. which do not require grid voltage source. The system was designed to return the power consumed during the testing to the grid line by connecting the synchronizing pwm inverter circuit to the grid voltage source, and was also made to enable the being-tested system from disuse of approximately 93.4% energy when compared to the conventional load testing system which has used the passive resistor.

• Journal of the Korean Society of Costume
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• v.45
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• pp.85-102
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• 1999

The purpose of this study is reviewing and researching the origins of knitwear the history of patterned knits. Aithough historians know little about the origins of knitting many believe it was practiced as early as the 4th century by nomads roaming North Africa. later Arab raders adopted the craft which helped then while away the hours as they traveled across deserts in camel carabans, Its origins lie in the need for close-fitting and elasticated covering for the body in particular the head hand and feet. it first developed in the Mediterranean countries and later in Central and particularly Northern Europe. Early evidence of multicolored knitting is said to date back to the Egyptian Copts of 600-800 A.D. medieval knitting is developed through the Church and monastery. The increasing demand for knitted products already observable in the fourteenth and fifteenth centries and the number of preserved knitted articles increases inexcavated materialos from Europe. The improvements in technique stimulated the developement of the hand knitting industry in the early sixteenth century. The best-known source of production is the guild organization and their mass production consisted of the carpets cushion coverings and other small items for furnishing interiors but mainly of clothing. The demand for knitted goods was such that in the late sixteenth century it was mechanised, The knitting frame invented in 1589 by William Lee English priest was the most perfect machine of this period. The mass production of fully-fashioned and seamless garments in the late nineteenth and twentieth century was dangerously competitve to traditionally woven and sewn cloth in. As fashions changed knitwear has had an almost continuous ruse in public favour and the popularity of sports has encourage the fashion for flexible easy-fitting and absorbent garments.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.10 no.1
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• pp.81-86
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• 1990

This study aims to systemize the developement of the domestic girder bridges, and to contribute to the future construction of our own bridges. Bridges are analyzed by grouping them in terms of construction time and structural component. The bridges, which were constructed during the first era of Goryeo-dynasty, have no distinction between main beams and stone deck. Form the latter era of Goryeo-dynasty, the structure of the bridges began to seperate into main beams and stone deck in order to enlarge the width and span length. The bridges, which were constructed during the Chosun-dynasty, were constructed using modulized material, and are considered to be built by structural design concept. Their construction materials became larger due to the development of transportation method. The superstructure of the old Korean bridges became more complicated in contrast to simplification of the substructures.

• The Journal of Korean Physical Therapy
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• v.11 no.1
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• pp.1-21
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• 1999

Japanese welfare legislation for the disabled was enacted via Law 283 on December 26. 1956. The push for such legislation at the national level had gown concurrent with development of Japan's post-war economy Korean welfare law for disabled was made 22 years later and was again amended in 1989. The current legislation promotes and supports the legal welfare of the Koran disabled. The following are the results of a comparison between Korean and Japanese accessibility facilities and welfare law; 1) Japan's developement of disabled people's welfare law is inextricably linked to the development of disabled people's advocacy and the human rights movement. In addition, welfare policy has shifts its mandate from rehabilitation to independent living. It follows that local altitudes will play a pivotal role in further policy initiatives. Korean disabled people's welfare policy emerged hand in hand with economic recovery and development following the Korean War. By 1977 a special education law was enacted which-like it Japanese counterpart-promoted the education of disabled children. 2) Accessibility facilities were developed privately movement. The disabled faced constant and systematic disadvantages in public/private buildings and transportation systems. A general lack of cultural awareness and information relating ti these problems prevailed. These included-hut were by no means limited to sign language (for hearing the impaired) and braille(the language of blind). However, new attitudes and improvements have since emerged and new laws have resulted in the publication of Korean 'White Book' outlining the everyday problems faced by the disabled. In addition, mort convenient access facilities have been constructed in public and private buildings. In closing, legal support for the disabled, senior citizens and pregnant women continues to be improved by newer legislation enacted tin April 6, 1977.

• Korean journal of applied entomology
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• v.39 no.2
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• pp.99-103
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• 2000

The green lacewing, Chrysopa pallens (Rambur), was reared on artificial diets supplementedwith natural products such as lyophilized beef liver, silk worm pupae powder and drone honey beepowder. The performance of the green lacewing was improved siginificantly on only the diet to whichadded 1 % of silk worm pupae powder (wt/v). Larval developement was completed in 15.6 f 0.99 days,cocoon weight was 16.4f2.94 mg, and suvival to adult was 89.3% at 27$^{\circ}$C. And another diet made bymixing 4 part of lyophilized beef liver powder, 4 part of lyophilized beef powder, 3 part of lyophilizedchicken egg, 4 part of sucrose, and 50 mg each of vitamin C and Vanderzant's vitamin B mixture waspromising. Larval development of the green lacewing on this diet was completed in 12.7 f 1.45 days at27"C, pupal weight was 18.1 f 2.24mg, suvival to adult was loo%, and 633f70.4 eggs were laid in 20days after beginning of oviposition.ginning of oviposition.

• Korea Journal of Hospital Management
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• v.12 no.4
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• pp.119-142
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• 2007

Although Korea joined OECD in 1996, there has still seen much unbalance in medical care and welfare standard between urban and rural area. The unbalance of medical demand between urban and rural area deepened low utilization of rural hospitals. So it caused many hospital's failure and conversion in rural area. Many rural hospitals are in difficulty managing business because of low medical demand along with the shortage of medical manpower, medical equipment and facilities. The objectives of this study were to reveal the cause of low utilization of hospitals in rural area, and to increase utilization of those hospitals. In this study the improvement methods of rural hospital's utilization were presented by examining were placed in difficult management condition, in respect of hospital's management conditions, manpower input, patient medical treatment record, financial record, and actual output. The causes of rural hospital's low utilization were as follows; 1) changes in number and structure of population 2) rural people's preference for large hospitals and hospitals which located in urban area 3) rural hospitals lacking in hospital management skill. Consequently rural hospital's operation condition got more and more deteriorated. To raise rural hospital's utilization, method for social policy, method for health policy, and intrinsic method of hospitals were presented in turn. For rural residents to utilize medical service conveniently, it is necessary for rural hospitals operated normally. So government must insist that rural hospitals solve the problems which come out from their internal management problems. And also these rural hospitals should be supported and nurtured by the government until their management is operated normally.

• Korean Journal of Food Science and Technology
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• v.13 no.1
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• pp.53-56
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• 1981

Several tests were conducted to study lipoxygenase activity and off-flavor developement in frozen sweet corn. Fresh corn contained about 60% of total lipoxygenase activity in the germ section. When non-blanched frozen sweet corn was stored at $-10^{\circ}F$, it developed off-flavor and most significant changes in the flavor profile of off-flavored sweet corn was $4{\sim}5$ times higher hexanal peaks. The high hexanal peaks observed in the sterilized sweet corn with added lipoxygenase, alone and in combination with other enzymes, suggested the fact that high hexanal peaks in off-flavored sweet corn could be due to an oxidative reaction of lionleic acid (and other unsaturated fatty acids) catalyzed by lipoxygenase. Based on lipoxygenase activity and linoleic acid content in sweet corn, this reaction occur most heavily in the germ section of sweet corn. There was a significant relationship between flavor score of frozen stored corn-on-the-cob and hexanal peak in the germ section of corn-on-the-cob. This result indicated that hexanal peak could be used as an objective index of off-flavor development in frozen sweet corn.

• Journal of the Korea Furniture Society
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• v.11 no.2
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• pp.45-53
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• 2000

This study was carried out to determine the suitability of 3 months old bamboo species of Phyllostachys bambusoides S. et Z., Phyllostachys Pubescens Mazel and Phyllostachys nigra var henonis Stapf as raw materials for the manufacture of strandboard. Total of 108 strandboards were made using urea-formaldehyde resin content level of 12% and one percent of liquid wax emulsion. The strandboard consisted of three layers the top and the bottom layer of which were oriented to the same direction and weighted 25% of the strandboard each. The middle core layer weighed 50% of the board and was perpendicular to the outer top and bottom layers. Analysis was performed to determine the effect of strand lengths and Uowing years of 3 months, 2 years and 3 years on strandboard properties. The physical and mechanical properties of bamboo species and boards were measured and compared to the standard requirements of strandboards. The results are as follows; 1. The more the growing years the higher the density of bamboo. Top part of bamboo indicated higher density value than that of bottom part. 2. Bamboo showed higher static bending strength compared to the main wood species. Longer growing years of bamboo generally inclosed the static tending strength out there were no statistical significancies for Phyllostachys bmbusoides S. et Z. and Phyllostachys pubescens Mazel. 3. Strand length indicated no difference on density and moisture content of strandboard. 5 cm of strand length gave the best static bending strength and internal bonding strength. Bamboo strandboard exhibited lesser extents of thickness swelling than that of CSA standard. 4. 3 months old bamboo gave higher static bending strength of strandboard than those of 2 years and 3 years old bamboo. In case of Phyllostachys nigra var henonis Stapf, 3 months old bamboo indicated higher internal bonding strength than those of 2 years and 3years old bamboo. but in Phyllostachys bambusoides S. et Z., Phyllostachys pubescens Mazel, there were no difference among growing years. Growing years showed no different physical properties of bamboo strandboard.