• Journal of the Korean Mathematical Society
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• v.59 no.6
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• pp.1047-1065
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• 2022

For two dimensional lattices, a Gaussian basis achieves all two successive minima. For dimension larger than two, constructing a pairwise Gaussian basis is useful to compute short vectors of the lattice. For three dimensional lattices, Semaev showed that one can convert a pairwise Gaussian basis to a basis achieving all three successive minima by one simple reduction. A pairwise Gaussian basis can be obtained from a given basis by executing Gauss algorithm for each pair of basis vectors repeatedly until it returns a pairwise Gaussian basis. In this article, we prove a necessary and sufficient condition for a pairwise Gaussian basis to achieve the first k successive minima for three dimensional lattices for each k ∈ {1, 2, 3} by modifying Semaev's condition. Our condition directly checks whether a pairwise Gaussian basis contains the first k shortest independent vectors for three dimensional lattices. LLL is the most basic lattice basis reduction algorithm and we study how to use LLL to compute a pairwise Gaussian basis. For δ ≥ 0.9, we prove that LLL(δ) with an additional simple reduction turns any basis for a three dimensional lattice into a pairwise SV-reduced basis. By using this, we convert an LLL reduced basis to a pairwise Gaussian basis in a few simple reductions. Our result suggests that the LLL algorithm is quite effective to compute a basis with all three successive minima for three dimensional lattices.

• Journal of Korean Association for Spatial Structures
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• v.19 no.1
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• pp.45-51
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• 2019

In this study, the static load test and the load transfer test were carried out to evaluate the structural performance of the circular anchorage proposed by the previous study. Specimens were fabricated according to KCI-PS101 and ETAG 013. As a result of the static load test, it was verified that the displacement of the wedge and the strand was kept constant when the tensile force of 80% of the nominal strength of the strand was applied. In the load transfer test, it was confirmed that all the specimens satisfied the stabilization formula of KCI-PS101 and ETAG 013. Post-tensioned one-way slab with circular anchorage were fabricated to evaluate the flexural behavior. All specimens exhibited the same flexural behavior and maximum load. However, the specimen with circular anchorage were advantageous than the rectangular anchorage one in terms of crack control of the anchorage zone.

• Journal of the Korea Society of Computer and Information
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• v.24 no.3
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• pp.151-157
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• 2019

In this paper, we present a prototype system for controlling IoT home appliances via voice-based commands. A voice command has been widely deployed as one of unobtrusive user interfaces for applications in a variety of IoT domains. However, interoperability between diverse IoT systems is limited by several dominant companies providing voice assistants like Amazon Alexa or Google Now due to their proprietary systems. A global IoT standard, oneM2M has been proposed to mitigate the lack of interoperability between IoT systems. In this paper, we deployed oneM2M-based platforms for a voice record device like a wrist band and LED control device like a home appliance. We developed all the components for recording voices and controlling IoT devices, and demonstrate the feasibility of our proposed method based on oneM2M platforms and Google STT (Speech-to-Text) API for controlling home appliances by showing a user scenario for turning the LED device on and off via voice commands.

• Restorative Dentistry and Endodontics
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• v.27 no.3
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• pp.299-309
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• 2002

The purposes of this study were to evaluate the microtensile bond strength of one-step adhesives accord ing to various dentin surface treatments and to observe the interface between resin(Z-100$^{TM}$) and dentin under SEM. In this study forty-five non-caries extracted human molars and three adhesive systems were used ; AlI-Bond 2(AB), One-Up Bond F(OU), AQ-Bond(AQ). ; In Group 1, 2, 3, AB was used and tooth surfaces were treated by smearing(S), ultrasonic cleansing(US), etching(E) respectively. In Group 4. 5, 6, One-Up Bond F was used and tooth surfaces were also treated as the same way above. In Groups 7, 8, 9, AQ Bond was used and tooth surfaces wet$.$e treated as the same way. Each specimen was prepared for microtensile bond testing, and were stored for 24hrs in 37$^{\circ}C$ distilled water. After that, microtensile bond strength for each specimen was measured. Specimens were fabricated to examine the failure patterns of interface between resin and dentin and observed under the SEM. The results were as follows ; 1. The results(mean$\pm$SD) of microtensile test were group 1, 25.69$\pm$4.31MPa; group 2, 40.93$\pm$10.94MPa; group 3, 47.65$\pm$8.85MPa； group 4, 35.98$\pm$9.14MPa； group 5, 39.66$\pm$8.45MPa; group 6, 43.26$\pm$13.01MPa; group 7, 25.07$\pm$4.2MPa；group 8, 30.4$\pm$4.74MPa；group 9, 33.61$\pm$7.88MPa. 2. One-Up Bond F was showed the highest value of 36.98$\pm$9.14MPa in dentin surface treatment with smearing, and there were significant differences to the other groups (p<0.05). 3. All-Bond 2 was showed the highest value of 40.93$\pm$10.94MPa in dentin surface treatment with ultra-sonic cleansing, but was no significant difference to One-Up Bond F(p>0.05) 4. All-Bond 2 was showed the highest value of 47.65$\pm$8.85MPa in dentin surface treatment with etch ing(10%phosphoric acid), and there were significant differences to the other groups(p<0.05). 5. All-Bond 2 was showed the highest value of 47.65$\pm$8.85MPa in dentin surface treatment according to manufacture's directions. but was no significant difference to One-Up Bond F(p>0.05). 6. AQ Bond was skewed the lowest microtensile bond strength with various dentin surface treatment, and the were significant differences to the other groups(p<0.05).

• Journal of the Korean Society of Safety
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• v.14 no.1
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• pp.116-123
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• 1999

It is generally considered that only questionnares, collected at the time when each course close, have been evaluated & represented for all of the subjects. But all the result of each course can be actually evaluated using only the data taken from how to apply for at the construction site or at the factory, directly, for the period of at least one year, not just short months. This study is to evaluate and quantify the result and analyses using the data from questionnare concerning the level practically applied to each process at construction site. 1st for three(3) months, 2nd for six(6) months, 3rd for nine(9) months, finally 4th for twelve (12) months, one year These questionnares have been distributed for same people four(4) times to find out what to, how to be applied with each subject.

• Korean Journal of Mathematics
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• v.9 no.1
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• pp.45-52
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• 2001

Let A denote the set {$a{\in}M_n{\mid}a{\geq}0$, $tr(a)=1$}, $St(M_n)$ the set of all states on $M_n$, and $PS(M_n)$ the set of all pure states on $M_n$. We show that there are one-to-one correspondences between A and $St(M_n)$, and between the set of all extreme points of A and $PS(M_n)$. We find a necessary and sufficient condition for a state on $M_{n1}{\oplus}{\cdots}{\oplus}M_{nk}$ to be extended to a pure state on $M_{n1}+{\cdots}+_{nk}$.

• Asian Pacific Journal of Cancer Prevention
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• v.17 no.4
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• pp.1739-1744
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• 2016

We report herein an in vitro anticancer evaluation of a series of seven curcumin analogues (3a-g). The National Cancer Institute (NCI US) Protocol was followed and all the compounds were evaluated for their anticancer activity on nine different panels (leukemia, non small cell lung cancer, colon cancer, CNS cancer, melanoma, ovarian cancer, renal cancer, prostate cancer and breast cancer) represented by 60 NCI human cancer cell lines. All the compounds showed significant anticancer activity in one dose assay (drug concentration $10{\mu}M$) and hence were evaluated further in five dose assays (0.01, 0.1, 1, 10 and $100{\mu}M$) and three dose related parameters $GI_{50}$, TGI and $LC_{50}$ were calculated for each (3a-g) in micro molar drug concentrations (${\mu}M$). The compound 3d (NSC 757927) showed maximum mean percent growth inhibition (PGI) of 112.2%, while compound 3g (NSC 763374) showed less mean PGI of 40.1% in the one dose assay. The maximum anticancer activity was observed with the SR (leukemia) cell line with a $GI_{50}$ of $0.03{\mu}M$. The calculated average sensitivity of all cell lines of a particular subpanel toward the test agent showed that all the curcumin analogues showed maximum activity on leukemia cell lines with $GI_{50}$ values between 0.23 and $2.67{\mu}M$.

• Journal of Navigation and Port Research
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• v.35 no.2
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• pp.149-157
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• 2011

The objective of this study was to compare the attitude of merchant marine student of Thailand in 3 aspects; cognitive, affective and behavioral classified by institutes, domiciles, parent's occupation, parent's income per month, motivation and information receiving concerning mariner profession. The sample used in this study consisted of 867students in maritime institutes of Thailand. The instrument implemented in collecting data was a set of 30 five rating scale questionnaires. The statistical methods applied in analyzing the data were mean, standard deviation, t-test and one way analysis of variance and fisher's LSD. The results of this research shows that the attitude in vocational education of Thai merchant marine student was of the high in every aspect. Attitude for mariner profession of Thai merchant marine student in terms of different institutes had different in all aspects. In terms of different domiciles, it shows different attitude in affection and similar attitude in cognition and behavior. In terms of parent's occupation, it shows similar in all aspects. In terms of parent's income per month, it shows different attitude in cognition and affection and similar attitude in behavior. In terms of motivation, it shows similar in all aspects. In terms of information receiving concerning mariner profession, it shows different attitude in all aspects.

• The Journal of the Korean dental association
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• v.18 no.2 s.131
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• pp.115-119
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• 1980

The purpose of this study was to observe clinical behavior on a national dispersant amalgam alloy, KISTCAP which newly developed by the KIST (Korea Instute for Science and Technology) in Korea. The results were as follows: 1. There was no significant difference in manipulating between the above mentioned alloy and the conventional lathe cut alloy. 2. The condensation pressure for this alloy was relatively less than that of conventional one. 3. More time was needed to polish the surface of this amalgam filling body than the conventional one. 4. No notable difference was seen in the over-all clinical behavior between the Whitecap and kistcap, except the latter one showed a little more tendency in redish color.

• Proceedings of the KSPS conference
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• 2005.04a
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• pp.15-19
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• 2005

The aim of this study is to provide some information on frequencies of occurrence for units of Korean phonemes and syllables analysing spontaneous speech spoken by 3 to 8-year-old Korean children. 49 Korean Children(7${\sim}$10 children for each age) were employed as subjects for this study. Speech data were recorded and phonemically transcribed. 120 utterances for each child were selected for analysis except one child whose data were only 91 utterances. The data size of the present study were 5,971 utterances, 5,1554 syllables, and 105491 phonemes. Among 19 consonants, /n/ showed highest frequency rate of these four conson ants were over 50% for all age groups. Among 18 vowels, /a/ was the most frequent one and /i/ and / ${\wedge}$ were the second and third respectively. The frequency rate of these four consonants were over 50% for all age groups. Frequently occurring syllable types were a part of grammatical word in most cases. Only 5${\sim}$6% of syllable types covered 50% of speech.