• 소성∙가공
• /
• 제1권1호
• /
• pp.20-32
• /
• 1992

This paper describes some research of Computer-Aided Process Planning and Die Design of Hot Forging for axisymmetric parts produced by the press. An approach to the system is based on knowledge based system. The system has been written in AutoLisp with personal computer. Knowledges for process planning & die design are extracted from the plasticity theories, handbooks, relevent references and empirical know-how of field experts in hot forging companies. The developed system is composed of five main modules, such as input module, process planning module, die design module, flow simulation module and output module which are used independently or in all. The final output is generated in graphic from. The developed system which aids designer provides powerful capabilities for process planning and die design of hot forging. This system also provides approximate flow pattern.

• Kyungpook Mathematical Journal
• /
• 제51권2호
• /
• pp.177-185
• /
• 2011

A right ideal I of a ring R is small in case for every proper right ideal K of R, K + I ${\neq}$ = R. A right R-module M is called PS-injective if every R-homomorphism f : aR ${\rightarrow}$ M for every principally small right ideal aR can be extended to R ${\rightarrow}$ M. A ring R is called right PS-injective if R is PS-injective as a right R-module. We develop, in this article, PS-injectivity as a generalization of P-injectivity and small injectivity. Many characterizations of right PS-injective rings are studied. In light of these facts, we get several new properties of a right GPF ring and a semiprimitive ring in terms of right PS-injectivity. Related examples are given as well.

• 한국태양에너지학회:학술대회논문집
• /
• 한국태양에너지학회 2008년도 춘계학술발표대회 논문집
• /
• pp.252-256
• /
• 2008

Photovoltaic (PV) modules output changes noticeable with variations in temperature and irradiance. In general it is has been shown that a $1^{\circ}C$ increase in temperature results in a 0.5% drop in output. In this paper, seven PV module types are analyzed for variation in temperature and irradiance, and the resulting output characteristics examined. The 7 modules types utilized are as follows; 3 poly crystalline modules, 2 single crystalline modules, 1 back contact single crystalline module and 1 HIT module. 3 groups of experiments are then conducted on the modules; tests with varying irradiance values, tests with module temperature varying under $25^{\circ}C$ and tests with module temperature varying over $25^{\circ}C$. The experiments results show that as temperature rises the follow is observed; Pmax decreases by 0.6%, Voc decreases by about 0.4%, and Isc increasing by between 0.03%${\sim}$0.08%. In addition, an irradiance decrease of 100 w/m2 translates into a 10% drop in Pmax.

• 마이크로전자및패키징학회지
• /
• 제23권1호
• /
• pp.29-34
• /
• 2016

본 연구에서는 생체 영상 이미징을 위한 다채널 필터 모듈 개발 및 특성 평가 연구를 수행하였다. 필터 모듈은 700 nm 및 800 nm 파장대의 근적외선 형광 이미징을 동시에 구현할 수 있도록 제작되었으며, 모듈의 특성 평가를 위해 magnification, exposure, gain의 변수에 따른 signal to back ground ratio (SBR)을 통한 대조영상 평가를 진행하였다. 또한 생체 영상 분석을 위해 신장 및 간의 광학적 특성이 동일한 생체 모사 조직인 phantom을 제작하여 두께에 따른 필터 모듈의 특성 및 광원의 주입량에 따른 특성 연구를 진행하였다. 제작된 필터 모듈은 magnification, exposure, gain의 변화에도 4이상의 SBR 차이를 보이며, kidney phantom 및 liver phantom의 경우 각각 50 mA, 60 mA의 광원 주입량에서 4이상의 SBR 대조 영상을 확인하였다.

• Kyungpook Mathematical Journal
• /
• 제54권2호
• /
• pp.237-247
• /
• 2014

The purpose of this paper is to introduce the concept of strongly extending modules which are particular subclass of the class of extending modules, and study some basic properties of this new class of modules. A module M is called strongly extending if each submodule of M is essential in a fully invariant direct summand of M. In this paper we examine the behavior of the class of strongly extending modules with respect to the preservation of this property in direct summands and direct sums and give some properties of these modules, for instance, strongly summand intersection property and weakly co-Hopfian property. Also such modules are characterized over commutative Dedekind domains.

• 한국소음진동공학회논문집
• /
• 제18권3호
• /
• pp.356-360
• /
• 2008

This paper investigates the natural modes of moduled floating structure with module unit connector. As an example structure, a floating parking place($120m\;{\times}\;60m$) is considered. In the evaluation of natural modes, numerical equations are formulated by FEM(finite element method) and the natural modes are solved by the subspace iteration method. By comparing results for various sizes of module unit, the effect of unit size is investigated. By comparing results for various stiffness of module unit connector, the effect of stiffness of unit connector is also examined.

• 전기학회논문지P
• /
• 제56권4호
• /
• pp.191-194
• /
• 2007

This study focuses on the development of the Electrochemical type $CO_2$ sensor Module by using solid electrolyte which was first developed in our country. The module applied the creative fundamentals that the voltage state generated from Electro-chemical reaction using new materials is converted into $CO_2$ ppm. The study verified the accurate of Electromotive Force(EMF) through the experiment using high-impedance opamp(INA332) to measure EMF which ranges from 100mV to 600mV to be outputted from $CO_2$ sensor, and the small electric current of some nano-ampere(nA)

• 한국전자통신학회논문지
• /
• 제7권6호
• /
• pp.1513-1518
• /
• 2012

본 논문에서는 PC모듈 기반으로 LED(Light Emitting Diode)의 White조명을 이용한 VLC(Visible Light Communication) 송 수신기 모듈의 미디어 전송 시스템을 구현하고 전송 기술에 대해 성능 분석을 하기 위한 연구이다. LED가시광통신을 실현시키고자 송신부에는 1~12개의 LED발광소자와 수신부에는 가변 센서를 사용 하고자 한다. LED가시광통신을 하고자 개발이 이루어진 송 수신부의 초기 거리 값은 0~1m이상으로 하고 전체 시스템 전송 속도는 수천 kbps를 가지는 가시광 미디어 전송 시스템을 이루었다. 성능 분석을 위해서, PC 모듈에 LED 및 적외선센서를 구성하여 예측 및 통신 거리에 분석하여 응용 방법과 가능성에 대해서 확인하고자 한다. LED 모듈의 전체적인 효율 증가를 위하여 렌즈 착용시와 미착용시 각 성능을 측정하여 약 20%의 효율이 증가하였음을 알 수 있었다.

• KSBB Journal
• /
• 제13권2호
• /
• pp.125-132
• /
• 1998

Protein affinity membrane was prepared via the coating of chitosan gel on the porous flat polysulfone membrane surface, followed by the immobilization f the reactive dye (Cibacron Blue 3GA) to the chitonsan gel. The maximum protein binding capacity of affinity membrane was about 70${\mu}g/cm^2$ determined by the batch adsorption experiments of human serum albumin (HSA). Using module of this membrane, the characteristics of protein chromatography were investigated through the experiments of elution and frontal chromatography of HSA. This membrane module promises as a chromatography column, since it represented a lower pressure drop and a greater reproducibility. The protein separation ratio was significantly influenced by the flow rate of mobile phase and the injection quantity of HSA. The dynamic protein binding capacity of module decreased from the equilibrium binding capacity with increasing flow rate and approached the value of 15 - 20 ${\mu}g/cm^2$ for flow rates above 6 mL/min.

• 전기학회논문지P
• /
• 제53권2호
• /
• pp.77-81
• /
• 2004

In this paper, multi-functional measurement module for RTD and 4-20mA Analog input is presented. As you know, In many industry field, RTD has been used for measuring a temperature. Although It have good properties such as wide measurement range, accuracy, the hardware or software compensation methods were applied to better linearity in many applications. According to this paper, a simply approximation method and various measuring technique are proposed to compensate large lead's resistance influence in RTD temperature measurements. As the experiment and simulation results, it is proved that the proposed method has good performance of measuring temperature. Additionally, with the CAN based communication, remote monitoring and parameter setting functions are realized.