http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 박지만 (검색결과 212 건)
- 무료
- 기관 내 무료
- 유료
-
-
박지만,정원섭 대한전자공학회 1996 전자공학회논문지-B Vol.b33 No.7
A sinusoidal tuned VCO based on linear OTA's has been designed for instrumentation and measurement applications. It consists of a noniverting amplifier, a hard limiter, and a current controlable LC-tuned circuit which is realized vy two linear OTA's and two grounded capacitors. A prototype circuit has been built with discrete components. The experimental results show that the proposed VCO has a linearity error of less than 6.5 percent and a temperature coefficient of less than 200ppm/$^{\circ}C$ over a bias current range form 5$\mu$A to 100 $\mu$A(or an oscillation frequency range form 775.5 Hz to 20.371 kHz). A total harmonic distortion of 0.6 percent was measured for a peak-to-peak amplitude of 5V.
-
-
디지털 국소의치의 구강 내 적합도와 캐드 디자인 간의 비교연구
박지만,홍용신,박은진,김성균,곽재영,허성주 한국생체재료학회 2012 생체재료학회지 Vol.16 No.3
Recently the CAD/CAM solution of fabricating removable partial denture (RPD) by applying haptic input device, with which operator can feel 3D object by tactile sensation, electronic surveying, and rapid prototyping was introduced. The purpose of this study is to analyze the reproducibility of digital solution by comparing gaps of planned CAD design and those of completed digital RPD which is actually put in the mouth. Gaps between RPD framework and abutment tooth was taken by replica technique and measured by stereoscopic microscope. The space between virtual RPD framework design and scanned model was also measured by image analysis tool and the two data were compared and analyzed. The average replica gap was 271 μm and that of CAD gap was 166 μm. Digital RPD equipped with the suitable accuracy for the clinical application.
-
A comparative study of gold UCLAtype and CAD/CAM titanium implant abutments
박지만,이재봉,허성주,박은진 대한치과보철학회 2014 The Journal of Advanced Prosthodontics Vol.6 No.1
PURPOSE. The aim of this study was to evaluate the interface accuracy of computer-assisted designed and manufactured (CAD/CAM) titanium abutments and implant fixture compared to gold-cast UCLA abutments. MATERIALS AND METHODS. An external connection implant system (Mark III, n=10) and an internal connection implant system (Replace Select, n=10) were used, 5 of each group were connected to milled titanium abutment and the rest were connected to the gold-cast UCLA abutments. The implant fixture and abutment were tightened to torque of 35 Ncm using a digital torque gauge, and initial detorque values were measured 10 minutes after tightening. To mimic the mastication, a cyclic loading was applied at 14 Hz for one million cycles, with the stress amplitude range being within 0 N to 100 N. After the cyclic loading, detorque values were measured again. The fixture-abutment gaps were measured under a microscope and recorded with an accuracy of ±0.1 µm at 50 points. RESULTS. Initial detorque values of milled abutment were significantly higher than those of cast abutment (P<.05). Detorque values after one million dynamic cyclic loadings were not significantly different (P>.05). After cyclic loading, detorque values of cast abutment increased, but those of milled abutment decreased (P<.05). There was no significant difference of gap dimension between the milled abutment group and the cast abutment group after cyclic loading. CONCLUSION. In conclusion, CAD/CAM milled titanium abutment can be fabricated with sufficient accuracy to permit screw joint stability between abutment and fixturecomparable to that of the traditional gold cast UCLA abutment.
-
박지만,김현주,박은진,김명래,김선종 대한치과보철학회 2014 The Journal of Advanced Prosthodontics Vol.6 No.5
PURPOSE. In case of large horizontal discrepancy of alveolar ridge due to severe resorption, cantilevered crown is usually an unavoidable treatment modality. The purpose of this study was to evaluate the clinical criteria for the placement of the aforementioned implant crown. MATERIALS AND METHODS. The mandible model with 2 mm thick cortical bone and cancellous bone was fabricated from CT cross-section image. An external connection type implant was installed and cantilevered crowns with increasing offset of 3, 4, 5, 6, and 7 mm were connected. Vertical load and 30° oblique load of 300 N was applied and stress around bone and implant component was analyzed. A total of 14 cases were modeled and finite element analysis was performed using COSMOS Works (Solid works Inc, USA). RESULTS. As for the location of the vertical load, the maximum stress generated on the lingual side of the implant became larger according to the increase of offset distance. When the oblique load was applied at 30°, the maximum stress was generated on the buccal side and its magnitude gradually decreased as the distance of the offset load increased to 5 mm. After that point, the magnitude of implant component’s stress increased gradually. CONCLUSION. The results of this study suggest that for the patient with atrophied alveolar ridge following the loss of molar teeth, von-Mises stress on implant components was the lowest under the 30° oblique load at the 5 mm offset point. Further studies for the various crown height and numbers of occusal points are needed to generalize the conclusion of present study.
-
수동 소자를 이용한 ADSL POTS Splitter의 체계적인 설계
박지만,김진태,소운섭 한국통신학회 1999 韓國通信學會論文誌 Vol.24 No.6
ADSL POTS splitter를 설계하기 위한 체계적인 합성 과정을 제안하였다. 이들은 single-ended 인덕터, 균형 인덕터, 그리고 균형 밀결합 변압기 형태의 저역-통과 여파기로 구성된다. 이 3개의 저역-통과 여파기를 시뮬레이션한 결과, 주파수 특성이 일치함을 보여준다. ADSL 시스템에 적용하기 위해, 상업용 균형 밀결합 변압기를 이용하여 POTS splitter를 설계하였다. 그것을 실험한 결과, ADSL 시스템에서 POTS splitter가 0.2 kHz에서 3.4kHz까지의 주파수 범위에서(또는 음성 대역 주파수에서) $\pm$0.5dB보다 작은 리플 데시벨과 0.6 kHz에서 3.2kHz까지의 주파수 범위에서 130 $\mu\textrm{s}$보다 작은 지연 왜곡을 가진다는 것을 알았다. A systematic synthesis process is presented for the design of ADSL POTS splitters. It consists of a low-pass filter formed by a single-ended inductor, balanced inductor, and balance tightly coupled transformer. This three low-pass filters has been simulation. Simulation results show agreement of frequency characteristics. Therefore, POTS splitters using a commercial balance tightly coupled transformer are designed for the applications of ADSL system. The experimental results show that POTS splitter in the ADSL system has ripple decibel of less than $\pm$0.5 dB over a frequency range from 0.2 kHz to 3.4 kHz(or an audio band frequency) and delay distortion of less than 130 $mutextrm{s}$ over a frequency range from 0.6 kHz to 3.2 kHz.
-
-
공간적 의사결정을 위한 공간 데이터 웨어하우스 설계 및 활용
박지만,황철수,Park Ji-Man,Hwang Chul-sue 한국공간정보학회 2005 한국공간정보학회지 Vol.13 No.3
본 연구는 대용량의 공간자료에서 의미 있는 지식을 탐색 및 발견하고, 인터넷 환경에서 공간적 의사결정과정을 지원하기 위한 방안을 설계하였다. 그리고 설계를 기반으로 실험적 원형 시스템(Pilot Tested System)을 구현하여 의사결정자와 분석가 사이에서 특정주제에 적합한 다차원적 분석을 위해 양방향 통신이 가능하도록 공간 데이터 웨어하우스의 눈송이 스키마모델(snowflake schema model)을 활용하였다. 눈송이 스키마는 공간자료와 연계할 경우 기존 스타 스키마모델(star schema model)보다 확장성과 유연성이 뛰어난 분석중심의 설계방안이다. 또한 눈송이 스키마모델의 평가를 위해 백화점 거래사례를 통해 실험적 시스템을 구현하여 평가하였다. 이 시스템의 목적은 목표마케팅 지역설정이며, 의사결정자와 분석가의 양방향통신이 가능한 인터넷상담시스템이다. The major reason that spatial data warehousing has attracted a great deal of attention in business GIS in recent years is due to the wide availability of huge amount of spatial data and the imminent need for fuming such data into useful geographic information. Therefore, this research has been focused on designing and implementing the pilot tested system for spatial decision making. The purpose of the system is to predict targeted marketing area by discriminating the customers by using both transaction quantity and the number of customer using credit card in department store. Moreover, the pilot tested system of this research provides OLAP tools for interactive analysis of multidimensional data of geographically various granularities, which facilitate effective spatial data mining. focused on the analysis methodology, the case study is aiming to use GIS and clustering for knowledge discovery. Especially, the importance of this study is in the use of snowflake schema model capabilities for GIS framework.
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
