• Imaging Science in Dentistry
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• v.31 no.4
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• pp.205-207
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• 2001

Purpose : The aim of present study is to estimate the relationship among reference lines used for taking the extraoral radiography and panoramic radiography. Materials and Methods: Lateral cephalographs of 40 adults, aged 22 to 30 years were taken. Angles between reference lines (Frankfort line, canthomeatal line, infraorbitomeatal line, and occlusal plane) were measured. Results: Angles between Frankfort line and canthomeatal line, Frankfort line and infraorbitomeatal line, Frankfort line and occlusal plane, canthomeatal line and infraorbitomeatal line, canthomeatal line and occlusal plane, and infraorbitomeatal line and occlusal plane were 16.1° (±2.2), 5.8° (±2.4), 8.7° (±3.5), 10.3° (±1.3), 24.8° (±4.0), and 14.5° (±4.4),respectively. Conclusion: Angle between frankfort and canthomeatal line is very different with commonly known angle. Frankfort horizontal reference lines used for panoramic radiography need an exact definition and more accurate standard is needed for the taking of panoramic radiograph.

• The Journal of the Society of Korean Medicine Diagnostics
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• v.17 no.3
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• pp.215-223
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• 2013

Objectives Although tongue diagnosis is one of major diagnostic methods in east Asian traditional medicine, the standard of normal tongue color have not established. So we tried to suggest the method to establish the standard of normal tongue color range and the pilot data about the normal range. Materials and methods: 22 precedent study papers that presented the numerical data of normal (light red) tongue color were analyzed. At the same time, 46 adult people tongue color data were also collected and analyzed. Results Precedent studies showed remarkable fluctuations of the range of normal tongue color. Collected tongue color data of the 46 people showed mean Hue value 2 and standard deviation 14 in HSB system. Additionally, 3 ways of standard establishment for normal tongue color were suggested. Conclusion We suggest statistical method as a reasonable method for tongue color standard establishment and $2{\pm}14$ as a reference Hue value for normal tongue color.

• Proceedings of the IEEK Conference
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• 2003.07b
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• pp.923-926
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• 2003

This paper presents a novel low voltage reference circuit under the MOS threshold voltage(V$_{th}$) in standard CMOS process. It is based on the weighted difference of the gate-source voltages of an NMOS and a PMOS operating in saturation region. The voltage reference is designed for low power OLED driver ICs. The proposed circuit is designed using 0.35${\mu}{\textrm}{m}$ CMOS technology. The minimum supply voltage is 2V, and the typical temperature coefficient is 99.6ppm/ C.C.

• Journal of the Korean Institute of Telematics and Electronics C
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• v.34C no.4
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• pp.1-15
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• 1997

This paper proposes CMOS on-chip voltage and current reference circuits that operate at supply voltages between 2.5V and 5.5V without using a vonventional bandgap voltage structure. The proposed reference circuits based on enhancement-type MOS transistors show low cost, compatibility with other on-chip MOS circuits, low-power consumption, and small-chip size. The prototype was implemented in a 0.6 um n-well single-poly double-metal CMOS process and occupies an active die area of $710 um \times 190 um$. The proposed voltage reference realizes a mean value of 0.97 V with a standard deviation of $\pm0.39 mV$, and a temperature coefficient of $8.2 ppm/^{\circ}C$ over an extended temeprature range from TEX>$-25^{\circ}C$ to $75^{\circ}C$. A measured PSRR (power supply rejection ratio) is about -67 dB at 50kHz.

• Journal of Sensor Science and Technology
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• v.24 no.1
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• pp.62-68
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• 2015

The MPEG user description (MPEG-UD) which is a standard under exploration to ensure interoperability among customized recommendation services has been contributed since MPEG $104^{th}$ meeting at 2013. Twenty-two use cases that were divided into different applications have been proposed in the MEPG meetings. Most of use cases were referred to specific and restricted regarding to applications, it appears to miss an overall and explicit infra-structure. In this paper we describe a reference model, namely methodology to overcome aforementioned problems. Thereafter, we have applied reference model to context-based recommendation system to demonstrate the methodology and MPEG-UD schemas. In addition, we propose a development process of recommendation system in compliance with MPEG-UD.

• Journal of Korean Critical Care Nursing
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• v.2 no.2
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• pp.56-67
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• 2009

Purpose: This study was done to suggest the standard ICU nursing procedure and standard ICU nursing practice time carried out according to the standard ICU nursing procedure. Methods: Through the literature review, 35 standard ICU nursing activities were selected and classified under 6 categories. Standard nursing procedures were described by research team and 4 clinical practice experts. Content validity of descripted nursing procedure was performed by 6 clinical practice experts. After that standard ICU nursing procedures were identified, standard nursing practice times were checked through 1:1 observation. Results: 35 ICU nursing activities were identified and categorized into 6 domains of activities. Also, their standard nursing procedures were identified, and finally 33 standard nursing practice times were measured and analyzed. The result of the measurement, 1 ICU nursing activity was spent above 30 minutes, 3 activities done within 10-20 minutes, 4 activities done within 5-10 minutes, and 25 activities were spent below 5 minutes. Conclusion: Through this study, 35 standard ICU nursing procedures were described and 33 standard ICU nursing practice times which carried out according to standard ICU nursing procedures were checked. The result can be as fundamental data for the study of nursing activity time in the ICU.

• Proceedings of the IEEK Conference
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• 2002.06a
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• pp.171-174
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• 2002

In this study, we proposed a specification which is able to estimate tile uncertainty more easily and quickly and also able to maintain a confidence level when measuring tile magnitude and phase of 1-port and 2-port transmission.reflection coefficient using a VNA and attached coaxial cable probes. This proposed specification is available when it needs extra special condition of uncertainty estimation and when there is no additional standard equipment like as beadless airline or mismatch standard at the measurement institute. We compared and examined this proposed uncertainty estimation method with recommended EA specification and Agilent specification. As a result, we think that this proposed specification can be used as a reference for uncertainty estimation and calculation of VNA system, that is, a reference based on the IS0/1EC 17025 requirements.

• Proceedings of the KIEE Conference
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• 2006.10c
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• pp.609-611
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• 2006

This paper describes a CMOS sub-bandgap reference using Pseudo-Resistors which can be widely used in flash memory, DRAM, ADC and Power management circuits. Bandgap reference circuit operates weak inversion for reducing power consumption and uses Pseudo-Resistors for reducing the chip area, instead of big resistor. It is implemented in 0.35um Standard 1P4M CMOS process. The temperature coefficient is 5ppm/$^{\circ}C$ from $40^{\circ}C$ to $100^{\circ}C$ and minimum power supply voltage is 1.2V The core area is 1177um${\times}$617um. Total current is below 2.8uA and output voltage is 0.598V at $27^{\circ}C$.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.10a
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• pp.872-875
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• 1995

The strategy of open architecture control system intends to integrate manufacturing components on a single platform, so that a particular component can be easily added and/or replaced. Therefore, the control scheme is neither hardware dependent nor software dependent. In this paper a modular and object oriented approach for the open architecture structure of control systems is invesigated. A standard reference model for genetic manufacturer system, which consists of three modules; hardware module, operating system module, and application software module, is first proposed. Then a standard reference model for open architecture robot control system is suggested.

• Journal of the Korean Society of Clothing and Textiles
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• v.22 no.6
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• pp.781-792
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• 1998

The purpose of this study was to investigate the factors related to the propensity for symbolic consumption and the effects of materialism, reference group, and social stratification on the symbolic consumption in clothing. Data were administered to 957 adolescence in middle, high school, and college student living in Seoul, Chonju, Sunchon, Yousu, and Kwangyang from May to June 1997. For analysis of the data, frequencies, percentage, means, standard deviation, factor analysis, 1-test, one-way anomia, duncan's multiple range test, and multiple regression analysis were employed. The results of this study can be summarized asfollows. 1) Symbolic consumption, materialism, and reference group were found to have the significant differences according to social stratification groups by objectivemethod. The higher social stratification is, the higher symbolic consumption, materialism, and reference group were. 2) symbolic consumption were proven to have the significant differences according to materiaiism and reference group. The higher materialism and the influence of referencegroup indicated, the higher symbolic consumption. 3)according to the results of the regression analysis examining the relative influences of variables affecting symbolic consumption in clothing, the relative importance of the variables are in order of : the influences of the reference group, materialism, social stratification, status inconsistency type (occupation-income), and their explanatory power totalled 40.0%.