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IEC 61131-3 표준을 따른 PC용 소프트웨어 PLC의 개발
이철수,정구,이제필,심주현 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1
This paper describes a converting algorithm between programmable languages of a software PLC. It is based on IEC 61131-3 standard and PC. The proposed control logic is designed by the software model and common element with data type, variables, POUs(program organization unit) and execution control unit commonly used within programmable languages of IEC 61131-3 Standard. The generation method of object file is proposed on five programmable languaged based on IEC 61131-3. It is represented as follows; 1) the generation method using conversion algorithm for LD to IL with FBD(function block diagram), 2) the generation method using C code generation algorithm from SFC using the SFC execution sequence with FBD and ST(structured text). The proposed control logic generator was implemented by Visual C++ 6.0 and MFC an MS-windows NT 4.0.
정구현,이해길,박인태,이철희 한국농업정보과학회 2000 농업정보과학 Vol.2 No.1
This study was performed to investigate the status of using personal computer(PC) and to develope strategy to improve PC utilization of Cactus Farmers. Sixty nine farmers are surveyed to collect data. Many farmers had intention to use PC to manage Cactus and have recognized that PC is required to manage farm and to improve their life quality. As a result of analysis on farmers' need for agricultural information, they highly demanded infor-mation on production skills, marketing information, overseas production trends, imports and exports information. Some farmers using or having intention to use software for Cactus farming want software to be developed and dis-tributed to support production technolog', labor management production cost and benefit analysis etc.
제어 시스템 설계를 위한 IEC 1131-3 기반의 제어 로직 생성기의 개발
정구,심주현,이제필,이철수 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
This paper describes the methodology of an IEC 1131-3-based control logic generator for the control system design and converting algorithm between programmable languages. The proposed control logic generator is generated based on the software model and common element with data type, variables, POUs(program organization unit) and execution control unit commonly used within programmable languages of IEC 1131-3 Standard. The generation method of object file was proposed on five programmable language based on IEC1131-3. The generation method of object file is represented as following; 1) the generation method using conversion algorithm from LD to IL with FBD(function block diagram), 2) the generation method using C code generation algorithm from SFC using the SFC execution sequence with FBD and ST(structured text). The proposed control logic generator was implemented by Visual C++ and MFC on MS-windows NT 4.0
Lee, DongSoo,Lee, Juri,Park, Hyung-Gu,Choi, JinWook,Park, SangHyeon,Kim, InSeong,Pu, YoungGun,Kim, JaeYoung,Hwang, Keum Cheol,Yang, Youngoo,Seo, Munkyo,Lee, Kang-Yoon The Institute of Electronics and Information Engin 2016 Journal of semiconductor technology and science Vol.16 No.1
This paper presents a wide-frequency-range, low-power transceiver with an automatic impedance-matching calibration for TV-white-space (TVWS) application. The wide-range automatic impedance matching calibration (AIMC) is proposed for the Drive Amplifier (DA) and LNA. The optimal $S_{22}$ and $S_{11}$ matching capacitances are selected in the DA and LNA, respectively. Also, the Single Pole Double Throw (SPDT) switch is integrated to share the antenna and matching network between the transmitter and receiver, thereby minimizing the systemic cost. An N-path filter is proposed to reject the large interferers in the TVWS frequency band. The current-driven mixer with a 25% duty LO generator is designed to achieve the high-gain and low-noise figures; also, the frequency synthesizer is designed to generate the wide-range LO signals, and it is used to implement the FSK modulation with a programmable loop bandwidth for multi-rate communication. The TVWS transceiver is implemented in $0.13{\mu}m$, 1-poly, 6-metal CMOS technology. The die area of the transceiver is $4mm{\times}3mm$. The power consumption levels of the transmitter and receiver are 64.35 mW and 39.8 mW, respectively, when the output-power level of the transmitter is +10 dBm at a supply voltage of 3.3 V. The phase noise of the PLL output at Band 2 is -128.3 dBc/Hz with a 1 MHz offset.
Lee, Byeong-Cheol,Jeong, Gwanghui,Park, Myeong-Gu,Han, Inwoo,Mkrtichian, David E.,Hatzes, Artie P.,Gu, Shenghong,Bai, Jinming,Lee, Sang-Min,Oh, Hyeong-Il,Kim, Kang-Min American Astronomical Society 2017 The Astrophysical journal Vol.844 No.1
<P>We present the detection of long-period RV variations in HD. 36384, HD. 52030, and HD. 208742 by using the high-resolution, fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES) for the precise radial velocity (RV) survey of about 200 northern circumpolar stars. Analyses of RV data, chromospheric activity indicators, and bisector variations spanning about five years suggest that the RV variations are compatible with planet or brown dwarf companions in Keplerian motion. However, HD. 36384 shows photometric variations with a period very close to that of RV variations as well as amplitude variations in the weighted wavelet Z-transform (WWZ) analysis, which argues that the RV variations in HD. 36384 are from the stellar pulsations. Assuming that the companion hypothesis is correct, HD. 52030 hosts a companion with minimum mass 13.3 M-Jup orbiting in 484 days at a distance of 1.2 au. HD. 208742 hosts a companion of 14.0 M-Jup at 1.5 au with a period of 602 days. All stars are located at the asymptotic giant branch (AGB) stage on the H-R diagram after undergoing. the helium flash and leaving. the giant clump. With stellar radii of 53.0 R-circle dot and 57.2 R-circle dot for HD. 52030 and HD. 208742, respectively, these stars may be the largest yet, in terms of stellar radius, found to host substellar companions. However, given possible RV amplitude variations and the fact that these are highly evolved stars, the planet hypothesis is not yet certain.</P>
Resorption of Autogenous Bone Graft in Cranioplasty: Resorption and Reintegration Failure
Lee, Si Hoon,Yoo, Chan Jong,Lee, Uhn,Park, Cheol Wan,Lee, Sang Gu,Kim, Woo Kyung Korean Neurotraumatology Society 2014 Korean Journal of Neurotrauma Vol.10 No.1
<P><B>Objective</B></P><P>Re-implantation of autologous skull bone has been known to be difficult because of its propensity for resorption. Moreover, the structural characteristics of the area of the defect cannot tolerate physiologic loading, which is an important factor for graft healing. This paper describes our experiences and results with cranioplasty following decompressive craniectomy using autologous bone flaps.</P><P><B>Methods</B></P><P>In an institutional review, the authors identified 18 patients (11 male and 7 female) in whom autologous cranioplasty was performed after decompressive craniectomy from January 2008 to December 2011. We examined the age, reasons for craniectomy, size of the skull defect, presence of bony resorption, and postoperative complications.</P><P><B>Results</B></P><P>Postoperative bone resorption occurred in eight cases (44.4%). Among them, two experienced symptomatic breakdown of the autologous bone graft that required a second operation to reconstruct the skull contour using porous polyethylene implant (Medpor®). The incidence of bone resorption was more common in the pediatric group and in those with large cranial defects (>120 cm<SUP>2</SUP>). No significant correlation was found with sex, reasons for craniectomy, and cryopreservation period.</P><P><B>Conclusion</B></P><P>The use of autologous bone flap for reconstruction of a skull defect after decompressive craniectomy is a quick and cost-effective method. But, the resorption rate was greater in children and in patients with large skull defects. As a result, we suggest compressive force of the tightened scalp, young age, large skull defect, the gap between bone flap and bone edge and heat sterilization of autologous bone as risk factors for bone resorption.</P>
Optical Charge Pumping Technique for Extracting Interface States of Nano-Scale SONOS Flash Memories
Lee Sunyeong,김대환,Choi Chang-Min,Jeon Ki-Chan,Kang Gu-Cheol,Kim Dong Myong,Kim Kwan-Young,Kim Se-Woon,Lee Jang-Uk,Lee Jong Duk,Park Jun-Hyun,박병국,Park So-Ra,Roh Kang-Seob,Seo Seung-Hwan,Shin Hyungcheol 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.III
The optical charge pumping (CP) technique is proposed as a simple and fast method for extracting the energy distribution of interface trap, $D_{it}$, of silicon-oxide-nitride-oxide-silicon (SONOS) flash memories. It is based on the optical response of a subthreshold slope of a SONOS memory cell transistor and is more effectively applicable to nano-scale emerging devices than the conventional CP technique, because no electrical pulse is required during extraction and because the current is measured not from the substrate, but from the drain contact. This means that a large gate current can be easily corrected by monitoring both the gate current and the drain current, no parasitic effect is caused by excluding the pulse measurement setup, and the extraction of $D_{it}$ in devices on silicon-on-insulator substrates is possible. The results applied to SONOS memories show that the generation rate of interface traps with program/erase cycles is higher in the NAND flash scheme rather than in the NOR flash scheme.
Fulminant multicentric osteosarcoma with systemic metastasis in a dog
Lee, Jeong-Ha,Go, Du-Min,Lee, Su-Hyung,Lee, Gwan-Gu,Choi, Min-Cheol,Youn, Hwa-Young,Kim, Dae-Yong The Korean Society of Veterinary Science 2017 大韓獸醫學會誌 Vol.57 No.1
A 15-year-old castrated mixed breed dog presented due to a 5-month history of cough and difficulty in ambulation. Necropsy showed multiple periosteal and intramedullary infiltrative masses in the appendicular skeleton. In addition, single and multiple neoplastic nodules were observed in several organs, including the lungs, liver, kidney, and heart. Microscopically, several skeletal neoplastic masses and nodules in the parenchymal organs revealed similar changes. The neoplastic cells were spindle- to polygonal-shaped with prominent osteoid production and occasional cartilaginous and bone formation. Based on the gross findings and histopathology results, the case was diagnosed as multicentric osteosarcoma with systemic metastases.
이강진,허재영,하영철,안승희,이승준,이철구 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.6
기준 밀도계는 기준 조건하에서 밀도를 측정하는 기기로서, 산업계에서 특히 대유량 천연가스 계량에 폭 넓게 사용된다. 본 연구에서는 기준 밀도계의 적정 설치 및 운영방안을 제시하여 천연가스 유량 측정 정확도를 향상시키고자 현장 실험을 수행하였다. 실험 결과, 교정가스로 메탄과 질소가스 대신 메탄과 표준가스로 교정한 실험결과가 작은 밀도오차를 발생하고, 정확한 밀도 측정을 위해서는 정기적인 교정이 필수적이며, 또한 기준 밀도계는 주위 조건에 민감하게 반응하여, 주위 온도가 높으면 오차가 증가하는 것도 확인되었다. The specific gravity meter is the instrument used to measure the density of fluids under the reference conditions and it can be widely used in industrial areas, especially in massive flow rate natural gas industry. This study has been carried out in an attempt to improve measurement accuracy of natural gas flow rate calculation, providing the adequate installation and proper operation conditions of specific gravity meter. The test results are 1) the density measurement errors in case of using methane and standard gas as calibration gases are smaller than using methane and nitrogen gas, 2) the periodical calibration to maintain accurate density measurements is essential, and 3) the specific gravity meter is sensitive to changes of environmental conditions, expecially environmental temperature surrounding the specific gravity meter.