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Search Results: 1 - 10 of 2408 matches for " Kyeong Sik Nam "
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Frobenius numbers of Pythagorean triples
Byung Keon Gil,Ji-woo Han,Tae Hyun Kim,Ryun Han Koo,Bon Woo Lee,Jaehoon Lee,Kyeong Sik Nam,Hyeon Woo Park,Poo-Sung Park
Mathematics , 2014,
Abstract: Given relatively prime integers $a_1, \dotsc, a_n$, the Frobenius number $g(a_1, \dotsc, a_n)$ is defined as the largest integer which cannot be expressed as $x_1 a_1 + \dotsb + x_n a_n$ with $x_i$ nonnegative integers. In this article, we give the Frobenius number of primitive Pythagorean triples. That is, \[ g(m^2-n^2, 2mn, m^2+n^2) = (m-1)(m^2-n^2) + (m-1)(2mn) - (m^2 + n^2). \]
Exploring differential geometric space using GeoGebra
Kyeong-Sik Choi
GeoGebra : The New Language for the Third Millennium , 2010,
Abstract: In this paper, we explore differential geometric space with curves on 3-dimensional environment constructed in GeoGebra. Firstly, we construct 3-dimensional environment in GeoGebra and Frenet-Serret frame on a curve. Next we explore some curves in space and curves mapped on surface.
Exploring changes found in lab reports of pre-service science teachers by adapting a group questioning strategy with using the science writing heuristic template
Myeong-Kyeong Shin,Jeonghee Nam
Mevlana International Journal of Education , 2012,
Abstract: Pre-service elementary teachers' view on how scientific practice works could be shown in their lab reports especially which were designed to write their testing questions, methods, claims and evidences. For better practice of scientific inquiry for the pre-service teachers, Science Writing Heuristic was used as a teaching method. Only adopting worksheet of SWH and following the steps may lead students to the proper experience of scientific inquiry, which might be hardly expected. The stage of making their own testable questions is essential and critical for the scientific practice as well. This study presumed that a group questioning strategy at this stage would be effective for better scientific inquiry. The purpose of this study is to demonstrate changes of scientific practices after adapting group questioning strategy in terms of scientific reasoning and consistency among elements of scientific practices including questions, methods, claims, and evidences based on pre-service teachers' lab reports on elementary level science activities. During the science teaching methods course for pre-service elementary science teachers, the activity of various subjects in elementary science textbooks were implemented. In this study, two classes were observed and participants' writings were collected; one used science writing form without and the other with group questioning strategy. During participants' practices with the form, participants were asked to write what they were curious about, what they did and was their evidences, and what they claimed through the activity. There were found to be more interactions among participants and more relevant and testable questions asked in a class with group questioning strategies. It was implicated that participant pre-service teachers acted similar with children in terms of scientific practices as well. Further it was discussed whether scientific practice in school science truly include testing students' own questions.
Expression of aldo-keto reductase family 1 member C1 (AKR1C1) gene in porcine ovary and uterine endometrium during the estrous cycle and pregnancy
Kyeong-Seok Seo, Purevjargal Naidansuren, Sang-Hwan Kim, Seong-Jo Yun, Jong-Ju Park, Bo-Woong Sim, Cha-Won Park, Tseeleema Nanjidsuren, Myung-Hwa Kang, Heewon Seo, Hakhyun Ka, Nam-Hyung Kim, Sue-Yun Hwang, Jong-Taek Yoon, Keitaro Yamanouchi, Kwan-Sik Min
Reproductive Biology and Endocrinology , 2011, DOI: 10.1186/1477-7827-9-139
Abstract: Rapid amplification of cDNA ends (RACE) experiments were performed to obtain the 5' and 3' ends of the porcine 20alpha-HSD cDNA. Reverse-transcriptase-PCR (RT-PCR), real-time PCR, northern blot analysis, and western blot analysis were performed to examine the expression of porcine 20alpha-HSD. Immunohistochemical analysis was also performed to determine the localization in the ovary.The porcine 20alpha-HSD cDNA is 957 bp in length and encodes a protein of 319 amino acids. The cloned cDNA was virtually the same as the porcine AKR1C1 gene (337 amino acids) reported recently, and only differed in the C-terminal region (the AKR1C1 gene has a longer C-terminal region than our sequence). The 20alpha-HSD gene (from now on referred to as AKR1C1) cloned in this paper encodes a deletion of 4 amino acids, compared with the C-terminal region of AKR1C1 genes from other animals. Porcine AKR1C1 mRNA was expressed on day 5, 10, 12, 15 of the cycle and 0-60 of pregnancy in the ovary. The mRNA was also specifically detected in the uterine endometrium on day 30 of pregnancy. Western blot analysis indicated that the pattern of AKR1C1 protein in the ovary during the estrous cycle and uterus during early pregnancy was similar to that of AKR1C1 mRNA expression. The recombinant protein produced in CHO cells was detected at approximately 37 kDa. Immunohistochemical analysis also revealed that pig AKR1C1 protein was localized in the large luteal cells in the early stages of the estrous cycle and before parturition.Our study demonstrated that AKR1C1 mRNA and protein are coordinately expressed in the luteal cell of ovary throughout the estrous cycle and in the uterus on day 30 of pregnancy. Thus, the porcine AKR1C1 gene might control important mechanisms during the estrous cycle.The aldo-keto reductase (AKR) superfamily are monomeric oxidoreductases that catalyze the NADP(H)-dependent reduction of a wide variety of substrates, including steroids, prostaglandins, bile acids, carbohydrates, and
Sung Kwon Kang,Nam Sook Cho,Min Kyeong Jeon
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812002978
Abstract: In the title compound, C11H11N3O2S, the dihedral angle between the thiadiazole and phenyl rings is 28.08 (7)°. In the crystal, molecules are linked into an inversion dimer by a pair of intermolecular N—H...N hydrogen bonds with an R22(8) graph-set motif.
Sung Kwon Kang,Nam Sook Cho,Min Kyeong Jeon
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812000621
Abstract: In the title compound [systematic name: N-(carbamoylcarbamothioyl)benzamide], C9H9N3O2S, the benzoyl and terminal urea fragments adopt cisoid and transoid conformations, respectively, with respect to the S atom. The benzoyl and thiobiuret groups are almost coplanar, making a dihedral angle of 8.48 (5)°. The molecular structure is stabilized by an intramolecular N—H...O hydrogen bond. In the crystal, N—H...O and N—H...S hydrogen bonds link the molecules into a sheet parallel to the bc plane.
Ethyl N-[(benzyloxy)thiocarbonyl]carbamate
Sung Kwon Kang,Nam Sook Cho,Min Kyeong Jeon
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536811055942
Abstract: In the title compound, C11H13NO3S, the dihedral angle between the benzyl and carbamate groups is 12.67 (10)°. The S atom and the carbonyl O atom are positioned anti to each other. In the crystal, pairs of N—H...S hydrogen bonds link molecules into inversion dimers.
Biomass and Community Structure of Epilithic Biofilm on the Yellow and East Coasts of Korea  [PDF]
Bo Yeon Kim, Seo Kyoung Park, Jin Suk Heo, Han Gil Choi, Young Sik Kim, Ki Wan Nam
Open Journal of Marine Science (OJMS) , 2014, DOI: 10.4236/ojms.2014.44026
Abstract: Spatial biomass variation and community structure of epilithic biofilms were examined using cell counts, chlorophyll a extraction, and remote-sensing techniques. Samples were collected at two levels of wave exposure along the Yellow and East Coasts of Korea in December 2010. Cyanobacteria were dominant, occupying about 88% of biofilm, irrespective of wave exposure levels. The cyanobacteria species, Aphanotece spp. was abundant in the Yellow Coast location and Lyngbya spp. was abundant in the East coast location. The representative diatoms were Navicula spp. and Achnanthes spp. on the rocky shores of all study sites. Average Normalized Difference Vegetation Index (NDVI) was significantly greater in the Yellow Coast (mean 0.46) than that in the East Coast (mean 0.21); a similar pattern was observed in Vegetation Index (VI). Chlorophyll a content was three times greater on the Yellow Coast (20.50 μg/cm2) than that on the East Coast (8.21 μg/cm2), and it was greater at the Gosapo and Bangpo shore sites than that at the Gyeokpo site, on the Yellow Coast. However, chlorophyll a contents were not different between 23.33 and 17.66 μg/cm2 at exposed- and sheltered-shores of Yellow Coast, and were 9.62 μg/cm2 and 6.80 μg/cm2 on the East Coast. Vegetation indices were positively correlated with chlorophyll a contents. In conclusion, biofilm of Korean upper rocky shore was mainly composed of cyanobacteria and biofilm biomass that differed between the Yellow and East Coast.
A New Method for Creating a Definite Philtrum by the Flipping of an Orbicularis Oris Muscle Flap in a Patient with an Indistinct Philtrum
Hyun Nam Choi,Sin Rak Kim,Yea Sik Han
Archives of Plastic Surgery , 2013, DOI: http://dx.doi.org/10.5999/aps.2013.40.1.62
Abstract: The philtrum plays a key role in the appearance of the upper lip and nostril sill. Therefore,construction of the philtrum is crucial for attaining a natural appearance of the upper lip. Weused a flipping myoplasty of the orbicularis oris muscle on a patient with a flat philtrum inorder to effectively reconstruct the philtral dimple and column. A 35-year-old female presentedto our department with the complaint of a flat upper lip. A superficial layer of the orbicularisoris muscle on the median aspect of the upper lip was vertically incised and elevated to athickness of 2 mm. Both sides of the elevated muscle flap were then folded to the lateral sidesso that the border could be sutured onto the outer portion of the orbicularis oris muscle. Thepatient was observed for one year postoperatively. Her philtrum deepened by 1.25 mm, with thecentral angle of her Cupid’s bow improving from a preoperative measurement of 146° to 128°postoperatively. In a patient with an indistinct philtrum, a flipping orbicularis oris myoplastywas performed to attain a definite philtral column and a philtral dimple. Natural upper lipmovement was maintained, and an aesthetically and functionally satisfactory reconstructionwas achieved.
Technical Report: A New Multi-Device Wireless Power Transfer Scheme Using an Intermediate Energy Storage Circuit
Changseok Yoon,Sung Sik Nam,Sung Ho Cho
Computer Science , 2013,
Abstract: A new multi-device wireless power transfer scheme that reduces the overall charging time is presented. The proposed scheme employs the intermediated energy storage (IES) circuit which consists of a constant power driving circuit and a super-capacitor. By utilizing the characteristic of high power density of the super-capacitor, the receiver can receive and store the energy in short duration and supply to the battery for long time. This enables the overlap of charging duration between all receivers. As a result, the overall charging time can be reduced.
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