• Proceedings of the KAIS Fall Conference
• /
• 2004.06a
• /
• pp.172-175
• /
• 2004

This paper analyzes the effects of Ge profiles shape of SiGe heterojunction bipolar transistors (HBT's) for high frequency application. Device simulations using ATLAS/BLAZE for the SiGe HBT with trapezoidal or triangular Ge profile are carried out to optimize the device performance. An HBT with $15\%$ triangular Ge profile shows higher cut-off frequency and DC current gain than that with $19\%$ trapezoidal Ge profile. The cut-off frequency and DC gain are increased from 42GHz to 84GHz and from 200 to 600, respectively. The SiGe HBT has been fabricated using a production CVD reactor.

• Geomechanics and Engineering
• /
• v.16 no.6
• /
• pp.569-575
• /
• 2018

The stability of shallow cavities with an arbitrary profile is a difficult issue in geotechnical engineering. This paper investigates this problem on the basis of the upper bound theorem of limit analysis and the Hoek-Brown failure criterion. The influence of pore pressure is taken into consideration by regarding it as an external force acting on rock skeleton. An objective function is constructed by equating the internal energy dissipation to the external force work. Then the Lagrange variation approach is used to solve this function. The validity of the proposed method is demonstrated by comparing the analytical solutions with the published research. The relations between shallow and deep cavity are revealed as well. The detaching curve of cavity roof with elliptical profile is obtained. In order to facilitate the application of engineering practice, the numerical results are tabulated, which play an important role in tunnel design and stability analysis of roof. The influential factors on potential collapse are taken into consideration. From the results, the impact of various factors on the extent of detaching is seen intuitively.

• Journal of the Korea Society of Computer and Information
• /
• v.17 no.6
• /
• pp.131-144
• /
• 2012

MDD is suitable to satisfy constraints of development of mobile applications. So, there are various studies about applying MDD to the developments of mobile application but systematic development methods about UML profile for PIM/PSM of mobile applications and model transformation techniques are needed. This paper suggests that a development technique about UML profile for PIM/PSM of mobile applications and a model transformation techniques with the profiles. We classify stereotypes by the characteristics of mobile application to compose profiles and suggest development guidelines of profiles for PIM/PSM. On the suggested model transformation process, the PIM with the profiles is transformed to the intial PSM with the mapping rules and the PSM is transformed to the refined PSM with templates which reflected detailed information of a mobile platform. We developed a location based service mobile application with the suggested techniques on the Android platform and compared with other techniques to validate usefulness of the suggested techniques.

• Journal of the Korean Graphic Arts Communication Society
• /
• v.28 no.1
• /
• pp.25-42
• /
• 2010

One of the important roles of worflow is color management. In general, color management technique, which is called CMS(color management system), is a method to solve problems that show different characteristics of color regeneration in output devices, and the characteristics of output devices is created in data file called ICC(International Color Consortium) profile. In addition, ICC profile is used to manage color in workflow, and includes other functions, process management and printing quality management. In domestic printing market, workflow is in the pipeline at rapid speed along with CTP, and use of ICC profile required for color management is also in rapid progress. Therefore, this paper produced optimal ICC profile through experiment from the work of linearizing devices used in each field to color conversion work. Moreover, the paper confirmed how ICC profile will be used in printing field. In the profiling experiment based on hardcopy proofing, photographed copy and chrominance were compared by printing out in proof the image created through application and color conversion with the use of camera profile and proof profile produced in colorimetric method. By evaluating if color is expressed accurately from input to output through colorimetric color conversion experiment as above, the paper intended to propose color management method using optimal profile in printing process.

• Journal of Pharmaceutical Investigation
• /
• v.34 no.3
• /
• pp.201-207
• /
• 2004

In order to develop an optimum formulation for iontophoretic flux of vitamine C 2-phosphate (VCP), we have prepared three different hydrogels containing VCP, using carbopol, HPMC and poloxamer, and iontophoretic flux through hairless mouse skin from these hydrogels was carried out. Drug stability in phosphate buffer (PBS) solution (pH 7.4) with and without current application was studied. The effect of various factors, such as drug concentration, current density, and current profile on skin flux was also investigated. Stability study indicated that VCP in PBS (pH 7.4) solution was stable under the experimental condition, irrespective of the presence of current. Cathodal delivery increased the flux markedly, whereas the anodal and passive flux was negligible. Thus, cathodal delivery was used in all experiments. Flux increased as the drug concentration (2.5, 5.0, 7.5%) and current density $(0.2,\;0.4,\;0.6\;mA/cm^2)$ increased. Pulsed application of the current showed lower flux than constant current application. The results obtained suggest that VCP can be delivered into the skin and the amount delivered can be controlled by varying hydrogel, current density, drug concentration and current application profile.

• Journal of Korea Technical Association of The Pulp and Paper Industry
• /
• v.45 no.5
• /
• pp.1-13
• /
• 2013

This study found fit optimum C, M, Y, K solid density and $CIEL^*a^*b^*$ value to paper & ink as well as check about printing machine state for color management in H-UV waterless off-set printing first. These values applied to GRACoL G7 calibration method. This method is one of color standard management method of printing. GRACoL G7 calibration method is possible stable tone reappearance by controlling gray balance by NPDC(Natural Printing Density Curve). Also, this study used values to make device profile as result that is gotten by application of GRACoL G7 calibration method. This profile was applied to CMS(Color Management System) of H-UV waterless off-set printing, and the result was possible by color management that correspond in printing quality standard of ISO 12647-2 and GRACol 2006 specifications.

• Journal of Ocean Engineering and Technology
• /
• v.20 no.1 s.68
• /
• pp.43-47
• /
• 2006

Superposition of three wave trains on finite depth is investigated. This paper is focused on how to improve the linear superposition of three waves. This was realized by introducing the scheme. The idea of the scheme is based on a fixed point approach. Application of the scheme to the superposition makes it possible to obtain a wave profile of wave-wave interaction. With the help of FFT, it was possible to analyze high-order nonlinear frequencies for three interacting Stokes' waves on finite depth.

• The Journal of Korean Society for Radiation Therapy
• /
• v.7 no.1
• /
• pp.103-110
• /
• 1995

Dynamic wedge system has been introduced to modify the beam profile and to make homogeneous isodose curves in the mass of irregular shape. Before the clinical use of dynamic wedge, several factors such as wedge transmission factor, dose profile, percent depth dose, and wedge angle have to be measured quantitatively. Film dosimetry is used to evaluate these factors in this study. A comparison of the result of the dynamic wedge to physical wedge system is made. A positive result for the application of the dynamic wedge to clinic is derived even though there is a limitation in accuracy of the dosimetry system used. To measure all factors quantitatively, more accurate dosimetry systems are required.

• Transactions of the Korean Society of Mechanical Engineers
• /
• v.16 no.3
• /
• pp.453-458
• /
• 1992

본 연구에서는 유한요소법에 바탕을 둔 최적공정설계법을 이용하여 압출 금형 형상의 최적설계를 실시하였다.설계의 결과를 참고문헌에서 발췌한 이론해와 비교 하였으며, 축대칭 압출공정에서 압하율, 마찰, 재료특성 등이 금형의 최적형상에 미치 는 영향에 대하여 조사하였다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.13 no.9
• /
• pp.4234-4243
• /
• 2012

USN(Ubiquitous Sensor Network) application S/W has a complex characteristic that it controls various kind of sensor nodes organically based on the core modules of various target operating systems. Currently, various researches for efficient S/W development are being performed in USN application field. In order to increase S/W productivity, the method such as product line development approach to specify core common functions of applications according to the domain and develop applications with the core common functions and variant functions selected according to the workflow of applications is efficient. To apply this approach to the USN domain, characteristics of USN application S/W and product line development should be specified with one consistent view. However, it is difficult to efficiently specify the characteristics using general UML notations. In order to solve the problem, this paper proposes a method to effectively specify the characteristics of USN applications and product line development using UML profile which is the extension mechanism of UML. The proposed UML profile for produce line based USN application development enables developers to effectively develop product line based USN applications using existing UML and UML support tools without new design methods or tools which are specified for USN or product line development.