• 한국군사과학기술학회지
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• 제25권3호
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• pp.259-266
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• 2022

This study aims to introduce missile live-fire during the ship operational test and evaluation(T&E) as a means of verifying the integrated combat capability(ICC) of various systems installed on naval ships. The research method identified domestic and foreign T&E systems and cases, and reports related to ICC, which were written during the ship's design stage. As a result of research, Republic of Korea is not conducting the missile live-fire at the ship T&E stage due to the lack of relevant systems, while the U.S. is conducting it based on the mission-based T&E and the end-to-end test system. As a way to improve within the current domestic ship acquisition systems, the reaction time analysis, a quantitative analysis result of ICC calculated at the ship basic design stage, was proposed to be verified by missile live-fire during ship operational T&E.

• Restorative Dentistry and Endodontics
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• 제28권6호
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• pp.449-456
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• 2003

The purpose of this study is to evaluate the sealing effect of several root-end filling materials using spectrophotometric analysis. 180 single root teeth with one canal were instrumented and canal filled. Root resected and root end preparation was made. Teeth were randomly classified to S experimental group(MTA, EBA, IRM, TCP, ZOE) and 1 control group according to root-end filling material MTA group used PRO ROOT MT A, EBA group used Super EBA. TCP group used NEW APATITE LINER TYPE II main component of which is ${\alpha}-tricalcium$ phosphate (TCP). According to manufacture's instruction experimental material was mixed and retrfilled. After 2% methylene blue solution penetration absorbance for each test sample was measured with spectrophotometer (JASCO UV-530, Japan). The mean absorbance of control and experimental group was as follows; MTA: 0.092, IRM: 0.226, Super EBA: 0.255, ZOE: 0.374, Control: 0.425, TCP: 0.501 and the result analyzed by Turkey test at P=0.05 level. Conclusions of this study are as follows; 1. The absorbance increase in following sequence MTA, IRM, Super EBA, ZOE, Control. TCP. 2. MTA showed the least leakage but was not significant with IRM or Super EBA and was significant with control or TCP(p<0.05). 3. TCP had the most leakage and was not significant with control group.

• Steel and Composite Structures
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• 제18권5호
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• pp.1215-1237
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• 2015

The majority of connections in moment resisting frames are considered as being fully-rigid. Consequently, the real behavior of the connection, which has some level of flexibility, is ignored. This may result in inaccurate predictions of structural response. This study investigates the influence of flexibility of the extended end-plate connections in the steel moment frames. This is done at two levels. First, the actual micro-behavior of extended end-plate moment connections is explored with respect to joint flexibility. Then, the macro-behavior of frames with end-plate moment connections is investigated using modal, nonlinear static pushover and incremental dynamic analyses. In all models, the P-Delta effects along with material and geometrical nonlinearities were included in the analyses. Results revealed considerable differences between the behavior of the structural frame with connections modeled as fully-rigid versus those when flexibility was incorporated, specifically difference occurred in the natural periods, strength, and maximum inter-story drift angle.

• 음성과학
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• 제11권4호
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• pp.185-195
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• 2004

Spastic dysarthria is a motor speech disorder produced by a damage to the direct (pyramidal) and indirect (extrapyramidal) pathways of the central nervous system. This study attempted to determine the influences of the severity of spastic dysarthria on the stability of voice. A sustained /a/, /a/ produced at the beginning of a sentence and at the end of the sentence were analyzed. The Praat 4.0.51 was used for analysis. The results showed a significant difference between the severe spastic dysarthric group and normal group matched by age and sex at the beginning and the end of the sentence. In addition, the severe group showed a significant difference between the first /a/ and the second /a/ at the end of sentence.

• Fibers and Polymers
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• 제3권2호
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• pp.55-59
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• 2002

The thermal reaction of acetoacetanilide in the presence of aniline or phenol yielded carbanilide in quantitative yields. This reaction was applied to the synthesis of polyurea. Bisacetoacetamides were prepared from diamines and diketene in DMF. They were thermally polymerized in the presence of phenol or a diamine (6FDA) to yield polyureas of low molecular weights. The polymers were soluble in DMSO and NMP. $^1{H-NMR}$ analysis showed that they had amino group terminated structures. Poly(urea-imide) was synthesized by the reaction of an oligourea diamine with pyromellitic dianhydride in NMP. The concentration of terminal amino groups was determined by an acid-base titration. The thermal property of poly(urea-imide) was evaluated by thermogravimetric analysis (TGA). Initial decompisition took place at 332-$350^{\circ}C$.

• Design & Manufacturing
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• 제11권2호
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• pp.46-50
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• 2017

EPS used in lost foam casting elastic modulus is extremely low. So it is necessary to derive machining conditions for effective cutting. Therefore this study were analyzed end-milling machining conditions to affecting the surface roughness of EPS foam. The machining conditions were set to depth, feed, and RPM at 3-level. And 18experimental conditions were derived using mixed orthogonal array. The most important condition for surface roughness is RPM. In addition, RPM machining condition range test that can realize surface roughness less than $10{\mu}m$ was performed. he range of RPM conditions is more than 15,000. However the range of RPM conditions is a condition that is difficult to use in actual field. In the future variance analysis and experiments are needed to derive the range of machining conditions available.

• Journal of Chest Surgery
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• 제28권11호
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• pp.1025-1031
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• 1995

Thirty patients who underwent esophageal resections due to esophageal carcinoma and benign strictures, and esophagovisceral anastomoses were performed by hand suture in 11 patients[Group I and by using the end to end anastomosis[EEA stapler in 19 patients[Group II . Anastomoses were performed in the thoracic cavity in 24 patients[Right 19, Left 5 and in the cervical area in 6 patients. There was one operative mortality[3.3% in a cancer patient who underwent Ivor-Lewis operation using EEA stapler. She expired on POD 38 days due to renal failure and sepsis. There were two anastomotic leakage in the sutured group and no anastomotic leakage in the stapled group. Late anastomotic strictures occurred in 10 patients[52.6% in the stapled group compared to 2 patients[18.1% in the sutured group. Most of the patients with late anastomotic strictures responded to one or two trials of TTS dilations. Using EEA stapler in performing esophagovisceral anastomosis is a safe method with acceptable range of complication rate, and total admission period after the operation for group I was 30.3 days compared to 25.4 days in group II although it had no clinical significance. The follow up was possible in 23 patients; 5 patients in group I died within mean 12.6 months and 9 patients in group II within mean 14.2 months.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2005년도 학술대회
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• pp.141-144
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• 2005

본 논문에서는 통신 방송 융합 환경하에서 다양한 이동 통신 단말을 가지고 있는 최종 소비자(End-user)에게 멀티미디어 콘텐츠를 서비스(간단히, UCA(Ubiquotous Contens Access) 라고 함) 해 주는 기술들을 소개하고 이 기술들이 적용된 시스템을 모델을 제안한다. 또한 제안된 서비스 기술에 대해 소비자 측면에서 보여지는 서비스 기술의 상대적 우위성과 오락성을 분석하였다. 통신 방송 융합 서비스 모델의 특성은 End to End(E2E) media QoS와 소비자 맞춤형 콘텐츠 소비 제공으로써 콘텐츠의 제작에서 적응, 전달, 그리고 최종 소비자에게 맞춤형 콘텐츠 소비를 가능하게 하는 유통 시스템을 가진다. 이와 같은 통신 방송 융합 환경에서의 멀티미디어 콘텐츠 서비스를 위한 서비스 모델을 제안하고 소비자 관점에서 바라본 통방 융합서비스 기술에 대해 상대적 우위성 및 오락성을 분석함으로써 제안된 통신 방송 융합 서비스 모델이 소비자 관점에서의 사업적인 가치가 있음을 알 수 있었다.

• 대한원격탐사학회지
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• 제38권4호
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• pp.411-419
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• 2022

DPR Korea has been creating cropland across the country due to its chronic food shortage. Cropland was about 17.4% at the end of the 1980s, but it increased steadily to 19.6% at the end of the 1990s, 24.8% at the end of the first decade of 2000s, and 25.4% at the end of the 2010s. On the other hand, the forest land declined from about 74.8% in the late 1980s to 69.5% in the late 2010s. Urbanization is also progressing, increasing from about 1.15% at the end of the 1980s to 1.68% at the end of the 2010s. Most of the deforestation that occurred in DPR Korea was caused by conversion to cropland. These characteristics of land cover changes in DPR Korea provide useful information and implications for international and inter-Korean cooperation for DPR Korea.

• Toxicological Research
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• 제14권4호
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• pp.465-474
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• 1998

This study was examined on the effect of ex-vivo immunotherapy in 7, 12-dimethylbenz[a]anthracene (DMBA)-induced rat mammary carcinogenesis. Sprague-Dawley female 40 rats were divided into Jour groups. As a positive control, Group I was intubated with DMBA, 5 mg /100 g body weight and single dose, at experimental onset. Group II was treated ex-vivo immunotherapy with polyinosinic-polycytidylic acid (Poly I : C) and Group III was treated with Interleukin-2 (IL-2). Group IV was negative control. All rats were sacrificed at 16 weeks after DMBA intubation. Mammary gland wet weight, dry fat free tissue weight, incidence of tumor, and the number of lobules, alveolar buds, terminal end buds, and terminal ducts were examined. Morphological changes of the mammary gland after treated with DMBA were analyzed by whole mount and histopathological method. As results, the induced mammary tumors of Group I, II and III were 60%, 33% and 0%, respectively. Histopathological types of induced-mammary tumors were adenoma, adenocarcinoma and carcinosarcoma. In analysis of the whole mount method, the number of the terminal end buds, terminal ducts and lobules were significantly lower in Group II (p<0.01) and III (p<0.01) than DMBA alone treated Group I. In microscopic observation, hyperplastic alveolar nodules were significantly lower in Group III than Group I (p<0.01). In conclusion, IL-2 had strong inhibitory effect on the mammary gland tumorigenesis induced by DMBA in rats. Whole mount method may be a useful technique to assess the mammary carcinogenesis. Moreover, hyperplastic alveolar nodules were very sensitive parameter to assess the mammary carcinogenesis.