• International Journal of CAD/CAM
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• 제6권1호
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• pp.59-64
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• 2006

A new method to obtain explicit re-parameterization that preserves the curve degree and parametric domain is presented in this paper. The re-parameterization brings a curve very close to the arc length parameterization under $L_2$ norm but with less segmentation. The re-parameterization functions we used are $C^1$ continuous piecewise rational linear functions, which provide more flexibility and can be easily identified by solving a quadratic equation. Based on the outstanding performance of Mobius transformation on modifying pieces with monotonic parametric speed, we first create a partition of the original curve, in which the parametric speed of each segment is of monotonic variation. The values of new parameters corresponding to the subdivision points are specified a priori as the ratio of its cumulative arc length and its total arc length. $C^1$ continuity conditions are imposed to each segment, thus, with respect to the new parameters, the objective function is linear and admits a closed-form optimization. Illustrative examples are also given to assess the performance of our new method.

• 한국환경생물학회:학술대회논문집
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• 한국환경생물학회 2003년도 학술대회
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• pp.116-120
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• 2003

The genus Paracalanus Boeck, 1864 dominate zooplankton communities in waters off Korean peninsula. Zooplankton samples collected from four waters (Uljin, Hadong, Youngkwang, Cheju) were sorted for specimens belonging to the genus Paracalanus. Paracalanus sp. regarded to p. paMus or p. indicus were examined. Body of male has cephalosome dorsal hump (CDH). Urosomites have four segments in female and five segments in male. In male, antennule is symmetry and fused without geniculation. The male antennule carries more aesthetascs than those in female antennule. Female P1-P4 is similar to those of male in seta and spine formular. Spinules on surface of legs are different each other. The female P5 is symmetrical, and composed of 2 segment. In male, it is aymmetrical and left leg composed of 5 segments, right leg 2-segmented. Male found patch of fine spinule on terminal inner surface of outer process on fifth segment. Sexual dimorphism appear saliently in mouth appendages. Mandible lacks of gnathobase; maxillule is apparently reduced; maxilla degrades it i]l female and remains vestiges between maxillule and maxilliped; maxilliped terminal part indistinctly articulated and carrying behind three strong plumose setae. With the absence of gnathobase in male, we conclude that male Paracalanus sp. does not feed.

• Journal of Korean Neurosurgical Society
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• 제29권4호
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• pp.550-554
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• 2000

Most extracranial schwannomas are solitary, but neurofibromas are frequently associated with other manietations of neurofibromatosis. Schwannomas that occur within the context of neurofibromatosis tend to be multiple, but multiple schwannomas without manifestation of neurofibromatosis type 2 are very rare. The authors report a very rare case of multiple spinal intradural schwannomas in the absence of neurofibromatosis Type 2 maniestations. A 40-year-old man suffered from longstanding low back pain and left side sciatica which was treated with two stage operations. MRI showed multiple intradural mass lesions extending from L1 vertebral segment to S1 vertebral segment. There were no clinical and radiological manifestations of Type 2 neurofibromatosis. Histologically confirmed diagnosis was schwannoma.

• The Plant Pathology Journal
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• 제20권3호
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• pp.212-219
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• 2004

Three isolates of Cucumber mosaic virus (CMV) from lily plants showing mosaic and distortion symptoms were detected by reverse-transcriptase polymerase chain reaction (RT-PCR) using primers specific to Cucumovirus genus namely, LK-CMV, LK4-CMV, and LKS-CMV. Restriction enzymes patterns of the RT-PCR products revealed that the lily isolates belonged to subgroup IA of CMV. In terms of biological properties, the lily isolates have highly similar but distinct pathogenicity as reported in other lily strains and ordinary strains of CMV. To characterize the molecular properties, cDNAs containing coat protein (CP) gene and 3' non-coding region (NCR) of RNA3 for the isolates were cloned and their nucleotide sequences were determined. The CP similarity (218 amino acids) was highly homologous (>97％) with that of subgroup I CMV strains. However, an additional 20-nulcleotide long segment was only present in 3' NCR of lily isolates, which form an additional stem-loop RNA structure. By using chimeric construct exchange cDNA containing 3'NCR of LK-CMV into the full-length cDNA clone of RNA3 of Fny-CMV, this additional segment may prove to be significant in the identification and fitness of the virus in lily plants. The pathology of zucchini squash infected by F1F2L3-CMV, a pseudorecombinant virus was showed to change drastically the severe mosaic and stunting symptom into a mild chlorotic spot on systemic leave, compared with Fny-CMV. To delimit the sequence of RNA3 affected the pathology, various RNA3 chimeras were constructed between two strains of CMV. The symptom determinants of F1F2L3-CMV were mapped to the positions amino acid 234, 239, and 250 in 3a movement protein (MP). RNA3 chimeras changed the sequences encoding three amino acids were resulted in alteration of systemic symptom.

• The Korean Journal of Pain
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• 제23권2호
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• pp.131-136
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• 2010

Background: We prospectively evaluated the incidence and possible factors causing intramuscular injection during lumbar sympathetic ganglion block and compared the multiple needle technique to the single technique to obtain a profound and complete block effect. Methods: Among 83 patients, 58 patients (group A, n = 27, multiple needle technique and group B, n = 31, single needle technique) were reevaluated for the changes of skin temperature (Ts) and mean segment of longitudinal contrast spread. After injecting the contrast agent, the incidence of psoas muscle injection and the change of Ts was compared between two groups. Results: The incidence of psoas muscle injection was 21.3% (46/216) and it was associated with the level of injection (L2) significantly (${\chi}_2$ = 14.773, P = 0.001). $DT^{post}$ (postblock temperature difference between ipsilateral and contralateral great toe, $4.6{\pm}2.8^{\circ}C$, $1.8{\pm}1.6^{\circ}C$, P < 0.001 for group A and B) and $DT^{net}$ ($DT^{post}$ - $DT^{pre}$, $3.9{\pm}2.7^{\circ}C$, $1.5{\pm}1.5^{\circ}C$, P < 0.001 for group A and B) was significantly higher in group A. The mean segment of longitudinal contrast spread was $8.1{\pm}0.9$ for group A and $3.2{\pm}1.6$ for group B (P < 0.001). Conclusions: The LSGB at the L2 level showed the lowest incidence of psoas muscle injection of contrast. Multiple needle approach showed more significant increase of $DT^{net}$ and $DT^{post}$.

• 한국항행학회논문지
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• 제24권6호
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• pp.500-507
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• 2020

본 논문은 기록된 항적 데이터를 이용하여 혼잡한 공항의 비행 절차별 위험도를 분석하는 방법론을 제시하고, ADS-B (automatic dependent surveillance-broadcast) 데이터를 기반으로 재생성된 100일 치의 항적 데이터를 사용하여 인천국제공항과 김포국제공항의 비행 절차별 위험도를 분석한 결과를 보여준다. 위험도 분석은 DWC (detect and void well clear) 를 이용하였으며, 이를 통해 비행 절차별로 가장 높은 위험도가 나타나는 구간과 위험 발생이 잦은 구간을 평가하였다. 그 결과, 인천국제공항의 표준계기출발절차 중 RNAV BOPTA 1L의 SI712 - RANOS Fix 구간에서 가장 높은 위험도가 나타났으며, 표준계기도착절차 중에서는 RNAV GUKDO 1N에서는 SI947-DANAN Fix 구간에서 가장 높은 위험도가 나타났다. 또한 김포국제공항의 표준계기출발절차 중에서는 RNAV BULTI 1X의 SS726 - SS727 Fix, 표준계기도착절차 중에서는 RNAV OLMEN 1D의 KAKSO - KALMA Fix 구간에서 가장 높은 위험도가 나타났다.

• Journal of Korean Neurosurgical Society
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• 제55권1호
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• pp.48-50
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• 2014

Brucellosis is caused by gram-negative, aerobic, non-motile, facultative, intracellular coccobacilli belonging to the genus Brucella. A 50-year-old man working as an employee was admitted to neurosurgery clinic with severe low back, radicular right leg pain and hypoesthesia in right L4-5 dermatomes for 2 months. Brucella tube agglutination (Wright) test was positive in serum sample of the patient with a titer of 1/640. Brucella melitensis was isolated from blood culture. X-ray and MRI of the lomber spine showed massive collapse of L4 vertebral body. Neural tissue was decompressed and then posterior L3-5 short segment transpedicular screw fixation and stabilization was performed. Brucella melitensis was isolated from microbiologic culture of pathologic specimen. Antibiotic therapy was given as doxycycline 200 mg/day and rifampicin 600 mg/day for 6 months. Brucellosis is a systemic zoonotic infection and still an important public health problem in many geographical parts of the world. Vertebral body collapse caused by brucellosis occurs very rarely but represents a neurosurgical emergency because of its potential for causing rapidly progressive spinal cord compression and permanent paralysis. Neurosurgeons, emergency department personnel as well as infectious disease specialists should always keep a high index of suspicion and include brucellosis in the differential diagnosis of vertebral body collapse.

• 식물조직배양학회지
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• 제25권6호
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• pp.515-518
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• 1998

Ethylene이 옥화란 rhizome의 증식과 유식물체의 분화에 미치는 영향을 조사하였다. Ethylene 발생량은 rhizome 치상 8일째 가장 많았고 배양기간 동안의 총 ethylene 발생량은 rhizome이 증식될 때보다 유식물체가 분화될 때 많았다. 배양 rhizome에 ethephon을 처리한 결과 ethephon은 rhizome의 증식과 유식물체의 길이생장은 억제하였으나 유식물체의 분화에는 효과적이었다. Aminoethoxyvinylglycine(AVG) 1mg/L 처리에서는 rhizome의 증식과 유식물체의 분화에는 효과적이었으나 10mg/L에서는 rhizome의 증식이 억제되었고 유식물체의 길이생장은 촉진되었다. $\textrm{AgNO}_{3}$처리는 rhizome의 증식과 유식물체의 분화를 억제하였다.

• BMB Reports
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• 제41권5호
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• pp.394-399
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• 2008

Multiple sequence alignments of the Bombyx mori fibroin light chain gene (fib-L) from hybrids and from Chinese and Japanese strains demonstrated that 51.6% of the fib-L third intron is conserved. One of these conserved segments, 41 bp long, contains the sequence CGTTATTATACATATT, which is duplicated in the B. mori Nd-$s^D$ mutant. In the present work, electrophoretic mobility assays and computational analyses revealed a major peak of intrinsic bent DNA within the segment that undergoes breakage in the previously-described Nd-$s^D$ mutation. This result suggested that this intrinsically-curved region might mediate DNA cleavage and enhance recombination events in the third intron of the Bombyx mori fib-L gene.

• 한국정보과학회논문지:시스템및이론
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• 제36권1호
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• pp.21-25
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• 2009

본 논문에서 우리는 평면상에 점들이 주어지는 경우에, 조각적 이차 다항식 곡선으로 맞추는 문제를 다룬다. 곡선은 이차 다항식 선분들로 이루어지고, 하나의 선분은 두 점 사이를 연결한다. 하지만 이 곡선은 점들의 부분집합만을 지나고, 지나지 못하는 점들에 대해서는 $L^{\infty}$거리로 에러를 측정한다. 이 문제에 대해서 우리는 두 가지 최적화 문제를 생각한다. 첫째로 허용 가능한 에러의 범위가 주어지고, 곡선 선분의 개수를 줄이는 문제이고, 둘째로 선분의 개수가 주어지고, 에러를 줄이는 문제이다. 주어진 점들의 개수 n에 대해서, 우리는 첫번째 문제에 대한 $O(n^2)$ 알고리즘과 두번째 문제에 대한 $O(n^3)$ 알고리즘을 제안한다.