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Tree-based Navigation Pattern Analysis
Choi, Hyun-Jip 한국통계학회 2001 Communications for statistical applications and me Vol.8 No.1
Sequential pattern discovery is one of main interests in web usage mining. the technique of sequential pattern discovery attempts to find inter-session patterns such that the presence of a set of items is followed by another item in a time-ordered set of server sessions. In this paper, a tree-based sequential pattern finding method is proposed in order to discover navigation patterns in server sessions. At each learning process, the suggested method learns about the navigation patterns per server session and summarized into the modified Rymon's tree.
A Split Criterion for Binary Decision Trees
Choi, Hyun Jip,Oh, Myong Rok 한국통계학회 2002 Communications for statistical applications and me Vol.9 No.2
In this paper, we propose a split criterion for binary decision trees. The proposed criterion selects the optimal split by measuring the prediction success of the candidate splits at a given node. The criterion is shown to have the property of exclusive preference. Examples are given to demonstrate the properties of the criterion.
h-STABILITY OF DIFFERENTIAL SYSTEMS VIA t∞-SIMILARITY
Choi, Sung Kyu,Koo, Nam Jip,Ryu, Hyun Sook 대한수학회 1997 대한수학회보 Vol.34 No.3
In recent years M. Pinto introduced the notion of h-stability. He extended the study of exponential stability to a variety of reasonable system called h-systems. We investigate h-stability for the nonlinear differential systems using the notions of t∞-similarity and Liapunov functions
최길수,김현집 대한신경외과학회 1984 Journal of Korean neurosurgical society Vol.13 No.1
The authors report our experiences with the use of Nd-YAG laser in extirpation of selected intracranial tumors: 5 Meningiomas, 1 Acoustic neurinoma, 1 He-mangioendothelioma and 1 Oligodendroglioma. The Nd-YAG laser is very helpful to coagulate the pathologic vessels. And because of it's excellent coagulation the Nd-YAG laser is particularly useful when applied in highly vascular tumor as well as in high contents of mesenchymal structures within the tumors.
( Hyun Woo Lee ),( Hansol Choi ),( Sang-jip Nam ),( William Fenical ),( Hoon Kim ) 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.4
Two piloquinone derivatives isolated from Streptomyces sp. CNQ-027 were tested for the inhibitory activities of two isoforms of monoamine oxidase (MAO), which catalyzes monoamine neurotransmitters. The piloquinone 4,7-dihydroxy-3-methyl-2-(4-methyl-1- oxopentyl)-6H-dibenzo[b,d]pyran-6-one (1) was found to be a highly potent inhibitor of human MAO-B, with an IC<sub>50 </sub>value of 1.21 μM; in addition, it was found to be highly effective against MAO-A, with an IC<sub>50 </sub> value of 6.47 μM. Compound 1 was selective, but not extremely so, for MAO-B compared with MAO-A, with a selectivity index value of 5.35. Compound 1,8- dihydroxy-2-methyl-3-(4-methyl-1-oxopentyl)-9,10-phenanthrenedione (2) was moderately effective for the inhibition of MAO-B (IC<sub>50 </sub> = 14.50 μM) but not for MAO-A (IC<sub>50 </sub> > 80 μM). There was no time-dependency in inhibition of MAO-A or -B by compound 1, and the MAO-A and -B activities were almost completely recovered in the dilution experiments with an excess amount of compound 1. Compound 1 showed competitive inhibition for MAO-A and -B, with Ki values of 0.573 and 0.248 μM, respectively. These results suggest that piloquinones from a microbial source could be potent reversible MAO inhibitors and may be useful lead compounds for developing MAO enzyme inhibitors to treat related disorders, such as depression, Parkinson`s disease, and Alzheimer`s disease.
OSCILLATION AND ASYMPTOTIC BEHAVIOR FOR DELAY DIFFERENTIAL EQUATIONS
Choi, Sung-Kyu,Koo, Nam-Jip,Ryu, Hyun-Sook 한국전산응용수학회 2000 Journal of applied mathematics & informatics Vol.7 No.2
In this paper we will survey the recent results about oscillation and asymptotic behavior for the linear differential equation with a single delay x'9t)+p(t)x(t-r)=0, $t\geqt_1$
Choi, Ki-Young,Kim, Moon-Jip,Kim, Dae-Sue,Kim, Yong-Son,Kim, Jae-Hyun,Ryu, Hai-Il,Lim, Youn-Mook,Kang, Seung-Gu,Shin, Ueon-Sang,Lee, Kyu-Chul,Hong, Choon-Pyo Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.8
The complexes [Ni(L)(INT)2]${\cdot}$5H2O (1) and [Cu(L)(H2O)](Cl)(INT)${\cdot}$3H2O (2) (L = 3,14-dimethyl-2,6,13,17-tetraazatricyclo[14,4,01.18 ,07.12 ]docosane, INT = isonicotinate) have been prepared and characterized by X-ray crystallography, electronic absorption, and cyclic voltammetry. The crystal structure of 1 reveals an axially elongated octahedral geometry with two axial isonicotinate ligands. The electronic spectra, magnetic moment, and redox potentials of 1 also show a high-spin octahedral geometry. However, 2 shows that the coordination environment around the copper atom is a distorted square-pyramid with an axial water molecule. The spectra and electrochemical behaviors of 2 are also discussed.
동종 골수 이식 후에 발생한 Nocardiosis 1예
최지현,최수미,이인석,최정현,이종욱,신완식,민우성,김춘추,김동집 대한감염학회 1998 감염 Vol.30 No.3
Nocardiosis는 면역 기능이 저하된 환자에서 발생할 수 있는 중요한 기회 감염의 하나로 이러한 환자에서 호흡기 증상을 보이면서 폐렴이 발생하였을 경우에는 결핵 또는 진균감염과 함께 반드시 감별 진단해야할 질환이며 골수 이식 후에 이식편대 숙주 반응과 연관되어 중증 감염이 발생할 수 있으므로 임상에서 이 질환에 대한 인식과 주의 깊은 관찰이 요구될 것으로 생각된다. 저자들은 동종 골수 이식 후에 nocardiosis가 발생하여 imipenem과 amikacin병합 치료로 상태가 호전 되었던 예를 문헌고찰과 함께 보고하는 바이다. The nocardiae are gram-positive, aerobic actinomycetes causing opportunistic infections in compromised hosts, such as recipients of solid organ transplants, patients with AIDS, and patients with cancer receiving immunosuppressive therapy, and those with chronic illnesses. Because cellular immunity and neutrophil function are critical for the clearance of Nocardia, frequent infection with the organism would be expected among marrow recipients, but reports of nocardiosis are surprisingly rare among these patients. We report a case of nocardiosis sixteen months after an allogenic bone marrow transplantation. The patient was successfully treated with imipenem and amikacin for 4 weeks and then with oral trimetho-prim-sulfamethoxazole.