• Journal of the Korea Institute of Information Security & Cryptology
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• v.34 no.4
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• pp.569-575
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• 2024

The 64-bit block cipher IIoTBC is an encryption algorithm designed for the security of industrial IoT devices and uses an 128-bit secret key. The IIoTBC's encryption algorithm varies depending on whether the MCU size used in IoT is 8-bit or 16-bit. This paper deals with a differential attack on IIoTBC when the MCU size is 8-bit. It attacks 15-round out of the entire 32-round using IIoTBC's 14-round differential characteristic. At this time, the number of required plaintexts and encryption are 2⁵⁷ and 2^122.4, respectively. The differential characteristic presented in this paper has a longer round than the existing 13-round impossible differential characteristic, and the attack using this is the result of the first key recovery attack on IIoTBC.

• Restorative Dentistry and Endodontics
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• v.23 no.2
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• pp.537-549
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• 1998

The purpose of this study was to evaluate the influence of root resection and retrograde cavity preparation methods on the apical leakage in endodontic surgery. To investigate the effect of various root resection and retrograde cavity preparation methods on the apical leakage, 71 roots of extracted human maxillary anterior teeth and 44 mesiobuccal roots of extracted human maxillary first molars were used. Root canals of the all the specimens were prepared with step-back technique and filled with gutta-percha by lateral condensation method. Three millimeters of each root was resected at a 45 degree angle or perpendicular to the long axis of the tooth according to the groups. Retrograde cavities were prepared with ultrasonic instruments or a slow-speed round bur, and occlusal access cavities were filled with zinc oxide eugenol cement. Three coats of clear nail polish were placed on the lateral and coronal surfaces of the specimens except the apical cut one millimeter. All the specimens were immerged in 2% methylene blue solution for 7 days in an incubator at $37^{\circ}C$. The teeth were dissolved in 14 ml of 35% nitric acid solution and the dye present within the root canal system was returned to solution. The leakage of dye was quantitatively measured via spectrophotometric method. The obtained data were analysed statistically using two-way ANOVA and Duncans Multiple Range Test. The results were as follows: 1. No statistically significant difference was observed between ultrasonic retrograde cavity preparation method and slow-speed round bur technique, without apical bevel (p>0.05). 2. Ultrasonic retrograde preparation method showed significantly less apical leakage than slow-speed round bur technique, with bevel (p<0.0001). 3. No statistically significant difference was found between beveled resected root surface and non-beveled resected root surface, with ultrasonic technique (p>0.05). 4. Non-beveled resected root surface showed significantly less apical leakage than beveled resected root surface, with slow-speed round bur technique (p<0.0001). 5. No statistically significant difference in apical leakage was found between the group of retrograde cavity prepared parallel to the long axis of the tooth and the group of one prepared perpendicular to the long axis of the tooth (p>0.05). 6. Regarding isthmus preparation, ultrasonic retrograde preparation method showed significantly less apical leakage than slow-speed round bur technique, in the mesiobuccal root of maxillary molar, without bevel (p<0.0001).

• Journal of the korean Society of Automotive Engineers
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• v.16 no.2
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• pp.1-11
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• 1994

여기서는 자동차를 중심으로한 동 부문에 새롭게 닥쳐오고 있는 그린 충격파, 즉, 몬트리올 의정서와 기후변화협약에 대해 알아보고 이에 대한 대응방안을 살펴 보고자 한다. 1. 자동차 관련 환경문제. 2. 몬트리올 의정서 : 지구 오존층파괴 규제. 3. 기후변화협약 : 지구온난화현상 규제. 4. 수송부문의 에너지절약대책.

• Proceedings of the KSME Conference
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• 2005.11a
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• pp.49.2-49.2
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• 2005

• Journal of the Chungcheong Mathematical Society
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• v.11 no.1
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• pp.87-98
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• 1998

The purpose of this paper is to show that there exists a fibrewise H-complete extension of a quasi-uniform space over a base.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.07a
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• pp.390-390
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• 2004

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.06a
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• pp.525-526
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• 2009

• Proceedings of the Korean Society of Embryo Transfer Conference
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• 2003.10a
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• pp.133-133
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• 2003

• Journal of the Korean Statistical Society
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• v.9 no.2
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• pp.194-212
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• 1980

This report describes a preliminary study necessary to implement Measurement Assurance Program (MAP). The purpose of the study is to improve the measurement reliability of the laboratories which take environmental pollution measurement. We carried out the interlaboratory test or "Round-Robin" test program in which seven laboratories participated in order to obtain more reliable data about water pollution.pollution.

• Food Science of Animal Resources
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• v.34 no.5
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• pp.674-682
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• 2014

The objective of this study was to investigate the physico-chemical and sensory properties of loin (m. longissimus dorsi) and top round (m. semimembranosus) beef from 3-, 6-, 9-, and 12 mon-old Holstein calves. For both loin and top round muscles, the moisture contents were decreased, whereas the protein and fat contents were increased, as the slaughtering age increased. In terms of meat color, for both muscle types, CIE $L^*$ values were decreased, whereas CIE $a^*$ values and myoglobin content increased as the slaughtering age increased. pH values were significantly higher in the 3 mon-old group than in the other groups. The Warner-Bratzler shear force (WBSF) values were lowest for loin muscles from the 12 mon-old group; however, there was no significant difference for top round muscle among the 4 age groups. Cooking loss for both loin and top round muscles were significantly higher for the 3 mon-old group than for the other groups. The water holding capacity (WHC) of both muscles were highest for the 12 mon-old groups (p<0.05). In fatty acid composition of the 12 mon-old groups, loin muscles had significantly higher levels of C14:0, C16:1n7, C18:1n9, and mono-unsaturated fatty acids (MUFA), and top round muscles had significantly higher levels of C16:1n7, C18:1n7, C18:1n9, MUFA, MUFA/SFA. Loin muscle from the 3- and 12 mon-old groups had significantly higher scores for tenderness and overall likeness. Top round muscle from the 9- and 12 mon-old groups had significantly higher scores for overall likeness than those from the other age groups.