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수종의 엔진구동형 Nickel-Titanium file을 이용한 근관형성 방법이 근관만곡도 유지능력에 미치는 영향
이철환,조경모,홍찬의 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.1
There are increasing usage of Nickel-Titanium rotary files in modern clinical endodontic treatment because it is effective and fater than hand filing due to reduced step. This study was conducted to evaluate the effect of canal preparations using 3 different rotary Nickel-Titanium files that has different cross sectional shape and taper on the maintenance of canal curvature. Simulated resin block were instrumented with Profile(Dentsply, USA), GT rotary files(Dentsply, USA), Hero 642(Micro-Mega, France), and Pro-Taper(Dentsply, USA). The image of Pre-instrumentation and Post-instrumentation were acquired using digital camera and overspreaded in the computer. Then the total differences of canal diameter, deviation at the outer portion of curvature, deviation at the inner portion of curvature, movement of center of the canal and the centering ratio at the pre-determined level from the apex were measured. Results were statistically analyzed by means of ANOVA, followed by Scheffe test at a significance level of 0.05. The results were as follows; 1. Deviation at the outer portion of curvature, deviation at the inner portion of curvature were showed largest in Pro-Taper, so also did in the total differences of canal diameter(p<0.05). 2. All the groups showed movements of center. Profile combined with GT rotary files and Hero 642 has no difference but Pro-Taper showed the most deviation(p<0.05). 3. At the 1, 2, 3mm level from the apex movements of center directed toward the outer portion of curvature, but in 4, 5 mm level directed toward the inner portion of curvature(p<0.05). As a results of this study, it could be concluded that combined use of other Nickel-Titanium rotary files is strongly recommended when use Pro-Taper file because it could be remove too much canal structure and also made more deviation of canal curvature than others.
Ui Cheol Jeong,Hee Kyung Kim,Hyo Jin Yoo,Cheol Yong Kim 국제물리치료학회 2017 Journal of International Academy of Physical Ther Vol.8 No.1
The Purpose of this study was to determine the effects of sciatic nerve mobilization on pain and lower back muscle strength in female patients in their 40s who have been diagnosed with lumbar radiculopathy. Using a simple blinded method, 20 female patients with neuropathy in the nerve segments between L4-S1 were randomly divided into one group (n=10) that would undergo sciatic nerve mobilization, and another group (n=10) that would perform lower back segment stabilization exercises. The two groups attended 3 sessions per week, with each session taking 30 minutes, for a duration of 4 weeks. In the preliminary examinations, the pain index as well as the isometric muscle strength of the lower back extensor and flexor muscles were measured. After the passing of 4 weeks. The same method of measurement was used for the concluding examinations. Comparison of the pain indices in the two groups revealed that they both experienced a statistically significant decrease, and further inspection revealed that the there was a more substantial difference in the sciatic nerve mobilization group. Results of comparing changes in the Isometric Muscle Strength lower back muscle and bending muscle by group, In comparison between groups, the isometric strength of the lower back extensor showed a more significant difference in the sciatic nerve mobilization group (p <.05). Conclulsion, it can be inferred that application of sciatic nerve mobilization has a positive effect on the pain index and isometric muscle strength of the lower back in female patients with lumbar radiculopathy in their 40s.
( Ui Cheol Shin ),( Yeon Kyu Jeong ),( Sang Chul Yoon ),( Kwang Ho Choi ),( Jin-koo Kim ) 한국수산과학회(구 한국수산학회) 2018 Fisheries and Aquatic Sciences Vol.21 No.4
The larvae and juveniles of Porocottus leptosomus belonging to the family Cottidae were collected (n = 95, 3.9-16.5mm in body length, BL) from Busan, Korea, in March 2015. The larvae and juvenile were identified using DNA barcoding as P. leptosomus, and their morphological description was presented in detail. The yolk-sac larvae (3.9-5.6mm BL) body was slightly compressed, the head was large, the eye was round and large, and the anus was before the middle of the body. The preflexion larvae (5.2-10.0mm BL) body length drastically increased; caudal fin rays began to occur. The flexion larvae (9.4-11.8mm BL) notochord flexion started; dorsal, pectoral, and anal fin rays began to occur; pelvic fin buds are seen; they possessed a pair of parietal spine; and a pair of supraocular cirri was first to develop. At 12mm BL, the notochord was completely flexed. The larva stage (3.9-12.6mm SL) had the stellate melanophores in the head, isthmus, gut, and tail (along to the ventral midline). During the juvenile stage (11.4-16.5 mm BL), melanophores covered the head and began to form five black bands on the side of the body. The larvae of P. leptosomus spent pelagic life, but moved to the bottom during the juvenile stage. The larvae and juveniles of P. leptosomus differ from other cottid larval fishes by body shape, melanophore head pattern, and spine development. P. leptosomus can be distinguished from Porocottus allisi by morphological development and the occurrence of larval fish: preopercular spine development, melanophore pattern, and caudal fin development.
신의철 ( Ui Cheol Shin ),윤석진 ( Seokjin Yoon ),김진구 ( Jin-koo Kim ),최광호 ( Gwangho Choi ) 한국수산과학회 2021 한국수산과학회지 Vol.54 No.4
Ichthyoplankton (fish eggs and larvae) were collected seasonally collected from 2017 to 2019 to clarify whether Dokdo serves as a fish spawning and/or nursery ground. Fish eggs were identified and classified into 16 species. The dominant fish egg species were Engraulis japonicus, Maurolicus japonicus, and Parajulis poecilepterus. Fish larvae were identified and classified into 15 species. The dominant fish larvae species were E. japonicus, M. japonicus, and Sebastes owstoni. A cluster analysis similarity percentages revealed two distinct groupings according to sample location (stations) with E. japonicus and M. japonicus as the main group influencers. E. japonicus was the dominant species off Dokdo. The species diversity and abundance peaked in summer. The diversity index, richness index, and evenness index fluctuated seasonally. There were no predominant species variations among the years. Sedentary spe-cies such as P. poecilepterus, Semicossyphus reticulatus, and Glyptocephalus stelleri occurred in the inshore stations. E. japonicus, M. japonicus, and Trachipterus trachypterus occurred in the offshore stations. Our results show these species use Dokdo as spawning and nursery grounds.
한국산 둑중개과 (Cottidae) 어류 1미기록종, Artediellus fuscimentus Nelson, 1986
신의철 ( Ui Cheol Shin ),박정호 ( Jeong-ho Park ),김진구 ( Jin-koo Kim ) 한국어류학회 2016 韓國魚類學會誌 Vol.28 No.3
2010년 12월 4일 강원도 동해시에서 15개체, 2015년 2월 1일 강원도 삼척시에서 1개체의 Artediellus fuscimentus가 처음 채집되었다. 본 종은 전새개골 가시 4개, 제2등지느러미 줄기 12~13개, 뒷지느러미 줄기 10~12개를 가지며, 첫번째 전새개골 가시 안쪽에 작은 가시가 없고 가슴지느러미 뒤끝이 뒷지느러미 기점을 지나는 특징을 가지고 있다. 또한 mtDNA cytochrome b 염기서열 600 bp를 이용하여 분류학적 위치를 확인하였다. 그 결과, 본 종은 Artediellus atlanticus와 차이(d=0.057~0.061)를 보였으나, 일본산 A. fuscimentus와는 완전히 일치 하였다. Artediellus속의 국명으로 “엄지횟대속”을, A. fuscimentus의 국명으로는 “엄지횟대”를 새롭게 제안한다. Sixteen specimens of Artediellus fuscimentus, belonging to the family Cottidae, were collected from the coastal waters off Samcheok and Donghae, Korea, in December 2010 and February 2015, respectively. The specimens are characterized by four preopercular spines, 12~13 second dorsal fin rays, 10~12 anal fin rays, a first preopercular spine with no minute spine on the inner side, and pectoral fin extending past the origin of the anal fin. We also analyzed 600 base pairs of the mitochondrial DNA cytochrome b sequence to confirm the taxonomic status of the specimens. The sequences of our specimens corresponded completely to those of Japanese A. fuscimentus, but differed from those of A. atlanticus (d=0.057~0.061). We propose the new Korean names “Eom-ji-hoet-dae-sok” for the genus Artediellus and “Eom-ji-hoet-dae” for the species A. fuscimentus.