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      • KCI등재

        격실 내 장애물이 폭압에 의한 인원 피해에 미치는 영향

        박성준,Park, Sung-Jun 한국시뮬레이션학회 2017 한국시뮬레이션학회 논문지 Vol.26 No.3

        격실 내부에서의 폭발로 인한 인원의 피해를 분석하였다. 특히 격실 내에서 폭압 전파에 영향을 미치는 돌출된 장애물의 유무에 따른 인원 피해를 비교하였다. 격실 내에 장애물이 없는 경우에 경험적 고속처리모델을 이용하여 폭압을 예측할 수 있다. 하지만 격실 내부에서는 폭압 프로파일이 개활지에서와 달리 복잡하며 의자와 같은 구조물이 존재하는 경우에는 경험적 고속처리모델 적용이 불가하다. 따라서 장애물이 있는 격실 내부 폭압은 유한요소해석을 이용해 획득하였다. 또한 개활지의 폭압 프로파일을 기준으로 개발된 Friedlander 압력-충격량 곡선을 격실 내부에서의 복잡한 폭압 전파로 인해 피해평가에 적용할 수 없어, Axelsson 단자유도 모델을 적용하여 인원 피해를 분석하였다. 장애물이 있는 경우 인원의 흉벽 속도는 26에서 76 퍼센트(%) 만큼 감소되었으며 격실내 인원피해 또한 감소되었다. Blast injuries in a compartment are investigated, and the effects of obstacles on blast injury are particularly analyzed by comparing injuries in the compartments with or without protruding obstacles inside. Even if blast pressure profile tends to be complicated in a confined space unlike in open field, it can be obtained in a relatively short time by using some empirical fast running models for simple confined spaces. However, a finite element method should be employed to obtain blast pressure profiles in a case with obstacles in confined spaces, because the obstacles heavily disturb blast waves. On the other hand, Axelsson SDOF(Single degree of freedom) model and ASII(Adjusted severity of injury index) injury level are employed to estimate blast injury in compartments, because the usual pressure-impulse injury criterion based on the ideal Friedlander waves in open the field cannot be applied to personnel in a confined space due to complexity of blast waves inside. In cases with obstacles, chest wall velocity was reduced by 26 to 76 percent(%) and the personnel injury in the compartment caused by blast was also reduced.

      • KCI등재

        다양한 입자크기와 산성도를 지닌 MTT 제올라이트의 합성 및 촉매특성 연구

        박성준,장회구,조성준,Park, Sung Jun,Jang, Hoi-Gu,Cho, Sung June 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.4

        다양한 Si/Al 몰비를 지닌 MTT 제올라이트를 합성하여 methanol-to-olefin(MTO) 반응에서 촉매의 산성도가 미치는 영향을 조사하였다. Si/Al 몰비를 조절하기 위해 N,N,N',N'-테트라메틸-1,3-디아미노프로판을 구조유도물질(SDA)로 사용하였으며, 알루민산나트륨의 함량을 달리하여 $20SiO_2$ : 30SDA : x (=0.25~1.25)$NaAlO_2$ : 2NaOH : $624H_2O$ 조성으로 모액을 제조한 후 433 K에서 4일 동안 수열 합성하였다. 알루민산나트륨의 함량이 감소함에 따라 MTT 제올라이트의 입자 크기가 증가하였으며 또한 산점의 양도 감소하였다. 제조한 MTT 제올라이트의 촉매 활성을 평가하기 위해 673 K에서 공간속도(WHSV)가 $1.2h^{-1}$인 조건으로 MTO 반응을 수행한 결과, Si/Al 몰비가 24인 H-MTT (1.00Al) 촉매가 900분까지 90% 이상의 전환율을 유지함을 확인하였다. The influence of acidity in MTT zeolite of different Si/Al molar ratio's on the catalyst activity in methanol-to-olefin (MTO) reaction has been investigated. The Si/Al ratio was controlled with the Al content in the gel when N,N,N',N'-tetramethyl-1,3-diaminopropane was used as a structure directing agent (SDA). The gel composition was controlled to $20SiO_2$ : 30SDA : x (=0.25~1.25)$NaAlO_2$ : 2NaOH : $624H_2O$, which was subject to the hydrothermal synthesis at 433 K for 4 days. As the composition of sodium aluminate decreased, the particle size of MTT zeolite increased, and also the amount of acid sites decreased. To investigate the catalytic performance, MTO reaction was carried out at 673 K with $1.2h^{-1}$ WHSV. It was found that the H-MTT (1.00Al) catalyst with a Si/Al molar ratio of 24 maintained the methanol conversion over 90% for 900 min.

      • KCI등재

        복분자(覆盆子)가 노화유발(老化誘發) 흰쥐의 항산화능(抗酸化能)에 미치는 영향(影響)

        박성준,이송실,백진웅,이상재,김광호,Park Sung-Jun,Lee Song-Sil,Baek Jin-Woong,Lee Sang-Jae,Kim Kwang-Ho 대한예방한의학회 2004 대한예방한의학회지 Vol.8 No.1

        Objectives: Rubi Fructus(fruit of Rubus coreanus Miq.) composed of Polygonum multiflorum THUNB. and some medical herbs is known as formula of senescence delay effect. The purpose of this study is to investigate the effect of Rubi Fructus(fruit of Rubus coreanus Miq.) on antioxidant enzyme activity such as Thiobarbituric acid reactive substance(TBARS), Superoxide dismutase(SOD), Catalase(CAT), Glutathione peroxidase(GSH-px) in rat erythrocytes and blood plasma. Methods: Sprague-Dawley rats were divided into 3 groups, Normal group(supplied enough water and feeds only, Normal Group), D-galatose administered group(injected D-galatose 50mg/kg, 1time/day for 6 weeks, Control Group) and Rubi Fructus (fruit of Rubus coreanus Miq.) administered group(D-galactose 50mg/kg and Rubi Fructus(fruit of Rubus coreanus Miq.) extracts 85.0mg/200g 1time/day for 6 weeks, BBJ Group). Rats were sacrificed and TBARS, SOD, CAT, GSH-px, Plasma total lipid, Plasma triglyceride and cholesterol were measured in rat erythrocytes and blood plasma. Results : Plasma TBARS concentrations of all experimental group were not significantly different. Red blood cell(RBC) SOD activities of BBJ group was increased, and RBC catalase activities of all experimental group were not significantly different. RBC GSH-px activities of BBJ group was increased. Plasma total lipid concentration of BBJ group were significantly lower than those of control. Plasma triglyceride, total cholesterol and HDL-cholesterol concentrations of all experimental group were not signi ficantly different. Conclusions: According to the above results, it is considered that Rubi Fructus(fruit of Rubus coreanus Miq.) is effective in inhibiting lipid peroxidation and increasing antioxidative enzyme activities in D-galactose induced aging rat.

      • KCI등재

        신재생 전원 계통 접속에 따른 전력계통 영향 평가에 관한 연구

        박성준,조윤성,허진,박상호,윤기갑,Park, Seoung-Jun,Cho, Yun-Sung,Hur, Jin,Park, Sang Ho,Yoon, Gi Gab 한국전기전자학회 2018 전기전자학회논문지 Vol.22 No.3

        본 논문에서는 신재생 발전원의 추가에 따라 계통에 미치는 영향에 관하여 서술하였다. 계통의 안정도 검토를 위해, PSS/E S/W을 이용하여 계통 해석을 수행하였다. 정상상태 조류 계산을 통한 선로 과부하 검토 및 고장 용량 해석을 통한 고장 전류초과여부 및 상정고장 해석을 통한 선로 과부하 여부를 확인하였다. 다이나믹 시뮬레이션을 통해 계통의 동적안정도를 확인하였다. 신재생 발전기 추가에 따른 계통 해석은 전력계통 신뢰도 및 전기품질 유지기준에 따라 해석을 수행하였다. In this paper, we describe the effects on the power system by adding renewable generator. In order to examine the stability of the system, the system analysis was performed using the PSS/E software. We confirmed whether occur the line overload of system through the load flow analysis and contingency analysis. and confirmed whether exceed of fault current using the fault current analysis. Dynamic stability of the system is analyzed through dynamic simulation. The analysis of the system according to the addition of the renewable generator was carried out according to the power system reliability and electricity quality maintenance standard.

      • Droplet Ejection and Experimental Study on the Application of Industrial Inkjet Printhead

        박성준,Park, Sung-Jun Institute of Convergence Technology 2011 융ㆍ복합기술연구소 논문집 Vol.1 No.1

        In this paper, a hybrid design tool combining one-dimensional(1D) lumped model and three-dimensional computational fluid dynamics(CFD) approach has been developed in order to evaluate the performance of inkjet print head and droplet control process are studied to reduce the deviations between nozzles which affect the size of the printed line for the industrial application of direct writing on printed circuit boards(PCB). 1D lumped model analysis shows that it is useful tool for evaluating performance of an inkjet head by varying the design parameters. The differences in ejected volume and droplet velocity between analytical and experimental result are within 12%. Time sequence of droplet generation is verified by the comparison between 3D analysis result and photographic images acquired by stroboscopic technique. In addition, by applying DPN process, velocity and volume uniformity between nozzles is dramatically improved that the tolerance achieved by the piezoelectric inkjet printhead across the 64 nozzles is 5 to 8%. A printed line pattern is successfully obtained using the fabricated inkjet print head and droplet calibration system.

      • KCI등재

        학교 집단급식소 내 식기류 및 집기류의 미생물학적 분석 및 위해요인 평가

        박성준,홍성호,이하영,김철주,김수진,김성균,고광표,Park, Sung-Jun,Hong, Sung-Ho,Lee, Anne Ha-Young,Kim, Cheol-Ju,Kim, Su-Jin,Kim, Sung-Kyoon,Ko, Gwang-Pyo 한국환경보건학회 2011 한국환경보건학회지 Vol.37 No.5

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        Objectives: The aim of this study was to evaluate the microbial hazards posed by food utensils and fixtures in food service operations at selected middle and high schools located in Seoul, Korea. Methods: We collected 200 samples of utensils and fixtures including cups, spoons/chopsticks, food trays and tables from five different schools in Seoul. Target microorganisms of this study were divided into two groups: total bacterial count and total coliform as indicators of microbial contamination and Bacillus cereus and Staphylococcus aureus as pathogens of food poisoning. We used selective media to quantify microbial concentration and 16S rRNA PCR assay for qualitative analysis. In addition, intensive interviews with nutritionists were conducted and observations were made to identify factors that may affect microbial contamination. Logistic regression analysis was employed to examine the relationship between the microbial concentration and operation characteristics of each operation. Results: The level of microbial concentration in school B and C were significantly lower than in school A, D and E (p<0.05). Some samples from school A, D and E showed over 3.4 log CFU/100 $cm^2$ (total bacterial count) and 1.0 log CFU/100 $cm^2$ (total coliform), which requires immediate hygienic action. The number of customers per staff member, periodicity of hygiene education for staff and daily operation time of sterilizers were also found to be important factors related with the microbial contamination of food service operations. Conclusions: These results suggested that not only a HACCP (Hazard Analysis and Critical Control Point) approach, but also efforts to assess internal risk factors within operations be needed to reduce the microbial contamination of food utensils and fixtures. This study is expected to provide preliminary data for assessing microbial hazards in food service operations.

      • 분산연산 방식을 이용한 이산시간 Cellular 신경회로망의 하드웨어 구현

        박성준,임준호,채수익,Park, Sung-Jun,Lim, Joon-Ho,Chae, Soo-Ik 대한전자공학회 1996 전자공학회논문지-B Vol.b33 No.1

        본 논문에서는 이산시간 cellular 신경회로망(DTCNN)의 효율적인 디지털 하드웨어 구조를 제안한다. DTCNN은 셀간의 연결 형태를 결정하는 템플릿(template)내에서 국소적이며 공간 불변적인 특징을 가진다. 이와 같은 DTCNN의 특징과 분산연산 방식을 결합하여 간단한 하드웨어와 적은 연결선으로 DTCNN 하드웨어를 구현하였다. 또한 분산연산의 특징인 비트별 연산 방식을 사용하여 셀 간의 연결을 위한 넓은 버스 폭을 단일 비트로 줄였다. 본 논문에서는 제안한 구조를 프로그래밍이 가능한 FPGA를 사용하여 가변적인 구조를 갖는 DTCNN 보드로 구현하였다. In this paper, we propose an efficient digital architecture for the discrete-time cellular neural networks (DTCNN's). DTCNN's have the locality and the translation invariance in the templates which determine the patterns of the connection between the cells. Using distributed arithmetic (DA) and the characteristics of DTCNN, we propose a simple implementation of DTCNN. The bus width in the cell-to-cell interconnection is reduced to one bit because of DA's bitwise operation. We implemented the reconfigurable architecture of DTCNN using programmable FPGA.

      • 가임기 여성의 방사선 치료 시 난소 선량 평가

        박성준,이영철,김선명,김영범,Park, Sung Jun,Lee, Yeong Cheol,Kim, Seon Myeong,Kim, Young Bum 대한방사선치료학회 2021 대한방사선치료학회지 Vol.33 No.-

        Purpose: The purpose of this study is to evaluate the ovarian dose during radiation therapy for breast cancer in women of childbearing age through an experiment. The ovarian dose is evaluated by comparing and analyzing between the calculated dose in the treatment planning system according to the treatment technique and the measured dose using a thermoluminescence dosimeter (TLD). The clinical usefulness of lead (Pb) apron is investigated through dose analysis according to whether or not it is used. Materials and Methods: Rando humanoid phantom was used for measurement, and wedge filter radiation therapy, 3D conformal radiation therapy, and intensity modulated radiation therapy were used as treatment techniques. A treatment plan was established so that 95% of the prescribed dose could be delivered to the right breast of the Rando humanoid phantom 3D image obtained using the CT simulator. TLD was inserted into the surface and depth of the virtual ovary of the Rando hunmanoid phantom and irradiated with radiation. The measurement location was the center of treatment and the point moved 2 cm to the opposite breast from the center of the Rando hunmanoid phantom, 5cm, 10cm, 12.5cm, 15cm, 17.5cm, 20cm from the boundary of the right breast to the center of treatment and downward, and the surface and depth of the right ovary. Measurements were made at a total of 9 central points. In the dose comparison of treatment planning systems, two wedge filter treatment techniques, three-dimensional conformal radiotherapy, and intensity-modulated radiation therapy were established and compared. Treatments were compared, and dose measurements according to the use of lead apron were compared and analyzed in intensity-modulated radiation therapy. The measured value was calculated by averaging three TLD values for each point and converting using the TLD calibration value, which was calculated as the point dose mean value. In order to compare the treatment plan value with the actual measured value, the absolute dose value was measured and compared at each point (%Diff). Results: At Point A, the center of treatment, a maximum of 201.7cGy was obtained in the treatment planning system, and a maximum of 200.6cGy was obtained in the TLD. In all treatment planning systems, 0cGy was calculated from Point G, which is a point 17.5cm downward from the breast interface. As a result of TLD, a maximum of 2.6cGy was obtained at Point G, and a maximum of 0.9cGy was obtained at Point J, which is the ovarian dose, and the absolute dose was 0.3%~1.3%. The difference in dose according to the use of lead aprons was from a maximum of 2.1cGy to a minimum of 0.1cGy, and the %Diff value was 0.1%~1.1%. Conclusion: In the treatment planning system, the difference in dose according to the three treatment plans did not show a significant difference from 0.85% to 2.45%. In the ovary, the difference between the Rando humanoid phantom's treatment planning system and the actual measured dose was within 0.9%, and the actual measured dose was slightly higher. This did not accurately reflect the effect of scattered radiation in the treatment planning system, and it is thought that the dose of scattered radiation and the dose taken by CBCT with TLD inserted were reflected in the actual measurement. In dosimetry according to the with or without a lead apron, when a lead apron was used, the closer the distance from the treatment range, the more effective the shielding was. Although it is not clinically appropriate for pregnancy or artificial insemination during radiotherapy, the dose irradiated to the ovaries during treatment is not expected to significantly affect the reproductive function of women of childbearing age after radiotherapy. However, since women of childbearing age have constant anxiety, it is thought that psychological stability can be promoted by presenting the data from this study. 목 적: 본 연구에서는 가임기 여성의 유방암 방사선 치료 시 난소 선량에 대해 실험을 통하여 평가해보고자 한다. 치료기법에 따른 치료계획시스템에서 계산된 선량과 열형광선량계를 이용한 측정선량을 비교·분석하여 난소 선량을 평가하고 납(Pb) 앞치마의 사용유무에 따른 선량 분석을 통해 임상에서의 유용성을 알아보고자 한다. 대상 및 방법: 측정에는 Rando humanoid phantom을 이용하였고, 치료기법으로는 쐐기필터치료기법, 3차원 입체조형치료, 세기변조방사선치료를 사용하였다. CT simulator를 이용하여 얻은 Rando humanoid phantom 3D 영상의 우측 유방에 처방선량의 95%가 전달될 수 있도록 치료계획을 세웠고, TLD를 Rando hunmanoid phantom의 가상 표적의 표면 및 심부에 삽입하고 방사선을 조사하였다. 측정위치는 치료 중심점과 Rando humanoid phantom의 정중앙을 중심으로 반대쪽 유방으로 2cm 이동한 지점과 치료 중심축 및 하방으로 우측 유방의 경계면에서 5cm, 10cm, 12.5cm, 15cm, 17.5cm, 20cm, 우측 난소 위치의 표면과 중심점을 포함하여 총 9개 지점에서 측정하였다. 치료계획시스템의 선량 비교에서는 쐐기필터치료기법 2가지와 3차원 입체조형치료, 세기변조방사선치료 등 총 4개의 치료 계획을 수립하여 비교하였다. 그리고 TLD를 이용한 측정값 비교는 세기변조방사선치료와 쐐기필터를 이용한 치료를 비교하였고, 납 앞치마의 사용유무에 따라서 세기변조방사선치료의 선량차이를 측정하여 비교·분석하였다. 측정값은 각 포인트마다 3개의 TLD값 평균을 내고 TLD 교정값을 이용하여 환산하였으며 이를 Point dose mean값으로 계산하였다. 치료계획값과 실제 측정값을 비교하기 위해 각 지점마다 절대선량값을 측정하여 %Diff 값으로 계산하였다. 결 과: 치료 중심점인 Point A에서는 치료계획시스템에서 최대 201.7cGy가 나왔고, 실제 TLD 측정값은 최대 200.6cGy가 나왔다. 모든 치료계획시스템에서 유방 경계면으로부터 하방으로 17.5cm 떨어진 지점인 Point G 부터는 0cGy로 계산이 되었다. 실제 TLD 측정 결과 Point G에서는 최대 2.6cGy가 나왔고, 난소선량인 Point J에서는 최대 0.9cGy로 나타났으며 %Diff값은 0.3%~1.3%였다. 납 앞치마의 사용유무에 따른 선량 차이는 최대 2.1cGy에서 최소 0.1cGy로 나타났으며 %Diff값은 0.1%~1.1%였다. 결 론: 치료계획시스템에서 3가지 치료계획에 따른 선량차이는 최저 0.85%에서 최고 2.45%로 큰 격차를 보이지 않았다. 난소에서 Rando humanoid phantom의 치료계획과 실제 측정한 선량차이는 0.9% 이내로 나타났으나 실제 측정에서 조금 더 높게 측정되었다. 이는 치료계획시스템에서 산란선의 영향을 정확하게 반영하지 못하였고, 실제 측정에서는 TLD를 삽입한 상태로 CBCT를 촬영한 선량과 산란선량이 반영된 것으로 사료된다. 납 앞치마의 유무에 따른 선량측정에서 납 앞치마를 사용했을 경우에 치료범위에서 가까운 거리일수록 차폐의 효과가 있었으며, 치료범위에서 15cm 이상 거리가 있는 경우에는 거의 영향을 미치지 않는 것으로 나타났다. 임상적으로 방사선 치료 중에는 임신이나 인공수정을 하기에는 적절하지 않지만, 치료 중 난소에 조사된 선량은 방사선 치료 후 가임기 여성의 생식 기능에 크게 영향을 주지 않을 것으로 생각된다. 하지만 가임 여성의 경우에는 지속적인 불안감을 가지고 있으므로 이번 결과를 통한 데이터를 제시함으로써 심리적인 안정을 도모할 수 있을 것으로 사료된다.

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