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1996년도 제35차 대한소화기학회 추계학술대회 / 일반연제 : 담도·췌장 ; 총담관 결석의 성분 분석 - 담낭결석과의 연관성에 관한 연구
김명환,이성구,유병무,서동완,정성애,김연석,김석균,이근찬,민영일,박광민,이영주,이승규 ( M . H . Kim,S . K . Lee,B . M . Yoo,D . W . Seo,S . A . Jung,Y . S . Kim,S . G . Kim,G . C . Lee,Y . I . Min,K . M . Park,Y . J . Lee,S . G . Lee ) 대한소화기학회 1996 대한소화기학회지 Vol.28 No.1
김명환,김철환,오철,윤석훈,김경근,Kim, M.H.,Kim, C.H.,Oh, C.,Yoon, S.H.,Kim, K.K. 한국마린엔지니어링학회 1994 한국마린엔지니어링학회지 Vol.18 No.5
The two-phase flow is observed in power plants, chemical process plants, and refrigeration systems etc., and it is very important to solve the heat transfer mechanism of a boiler, an automic reactor, a condenser and various types of evaporators. Recently, the problem of two phase heat transfer is braught up in many regions with development of energy saving technique. In flow boiling system it is necessary to store data in each condition because the heat transfer characteristics of flow boiling region vary by the change of flow pattern and the magnetude of heat flux to tube length, and be subtly affected by the flow and heating condition. So basic study for knowing flow pattern in heat transfer region and the relation between heat transfer characteristic and flow condition is desired to accumulate data in wide variety of liquid and flow system in the study of heat transfer of two phase flow. In this study R-113 was selected as working fluid whose properties were programmed by least square method, and experiment was conducted in the region of mass flow $1.628{\times}10^6$~$4.884{\times}10^6$/kg/$m^2$hr with inlet subcooling 10~3$0^{\circ}C$, sustaining test section inlet pressure to 1.5kg$_f$/$cm^2$abs.
RF 모듈-칩(Module-Chip)을 이용한 홈 네트워크 모듈설계
김명환,차진만,이상욱,성길영,박연식,Kim, Myeung-Hwan,Cha, Jin-Man,Lee, Sang-Wook,Sung, Kil-Young,Park, Yeoun-Sik 한국정보통신학회 2009 한국정보통신학회논문지 Vol.13 No.2
홈 네트워크 분야는 최근에 급격히 발달하고 있는 분야로서 그 성장 범위를 점차 확대해 나가고 있으며, 홈 네트 워크 분야의 기술 발달은 가전기기와 주변기기의 제어 및 관리를 위한 홈 네트워크 관리 기술의 발전을 가져오고 있다. 이러한 홈 네트워크의 구현은 기술의 발달에 따라 그 기능 또한 점점 복잡하고 다양한 프로세서의 처리를 필요로 하는 경향이 두드러지고 있다. 홈 네트워크 시스템은 여러 가지 요소에 의해 영향을 받기 때문에 시스템의 설계 상당히 중요한 과정에 해당된다. 이에 본 논문에서는 임베디드 개발 장비, STR710F Chip, CC2420 RF Module-Chip을 이용 소형화된 모듈을 설계하고 확장성을 고려하여 RS232C와 USB를 인터페이스로 한 홈 네트워크 시스템 모듈을 설계하였다. Home network is a rapidly growing area as new technologies are emerging, and new applications are being developed. The progress of home network technologies is growing the home network management technology for control and management of the digital appliances. Embodiment of these home network show marked ich have use for complicated and diversifiable processing. Design of home network system does very important stage through home network comes essential pars. In this paper, We designed and constitute Home network system which designs module using embedded system, STR710F Chip and CC2420 RF Module-Chip with the intention for using RS232C and USB.
김명환,이상규,김성곤 ( Myung Hwan Kim,Sang Kyu Lee,Sung Kon Kim ) 한국응용생명화학회 1997 Applied Biological Chemistry (Appl Biol Chem) Vol.40 No.5
The effect of sucrose fatty acid ester(SE, 0∼0.5%, w/w) and oligosaccharide(OS, 0∼1.0%, w/w) additions on texture properties, hardness(H), stickiness(-H), stickiness/hardness(-H/H) and elastic recovery (b/a) of cooked rice stored at 20℃ were studied. The H of stored cooked rice decreased with increasing storage time. The addition of SE and OS showed lower H value than control throughout the storage period up to 12hrs and after 8hrs of storage time, respectively. The -H of stored cooked rice increased with increasing storage time. The -H value of SE added cooked rice showed much lower than that of the control in the early stage of the storage and then almost the same value as that of control. The control and SE or OS added cooked rice resulted the value of -H/H between 0.15 and 0.20, which had been found as acceptable textural parameters, after 10hrs of storage at 20℃. The b/a of stored cooked rice decreased with increasing storage time, but was not significantly affected by additives. After 15 days of storage at 4℃, the addition of SE had greater effect on the reduction of hardness of stored cooked rice than that of OS.
3D 그래픽 Geometry Engine을 위한 부동소수점 연산기의 설계
김명환,오민석,이광엽,김원종,조한진,Kim, Myeong Hwm,Oh, Min Seok,Lee, Kwang Yeob,Kim, Won Jong,Cho, Han Jin 대한전자공학회 2005 電子工學會論文誌-SD (Semiconductor and devices) Vol.42 No.10
본 논문에서는 실시간 3D 가속을 효과적으로 하기 위해 기하학 처리 과정에 적합한 부동 소수점 연산기를 설계하였다. 설계한 부동 소수점 연산기는 IEEE-754 단정도 형식을 지원하도록 하여 기하학 처리에 적합하게 하였고 설계한 부동 소수점 연산기는 Xilinx-Vertex2에서 부동소수점 덧셈/곱셈기는 100 MHz, 부동소수점 NR 역수 계산기는 120 MHz, 부동 소수점 멱승기는 200 MHz, 부동 소수점 역 제곱근 연산기는 120 MHz의 동작 주파수를 각각 확인 하였다. 또한 설계된 부동소수점 연산기를 이용해 실제 기하학 프로세서를 구현하여 실제 3B 데이터 처리를 확인하였다. In this paper, we designed floating point units to accelate real-time 3D Graphics for Geometry processing. Designed floating point units support IEEE-754 single precision format and we confirmed 100 MHz performance of floating point add/mul unit, 120 MHz performance of floating point NR inverse division unit, 200 MHz performance of floating point power unit, 120 MHz performance of floating point inverse square root unit at Xilinx-vertex2. Also, using floating point units, designed Geometry processor and confirmed 3D Graphics data processing.
납형의 성질(性質) 및 성분(成分)에 관(關)한 연구(硏究)
김명환,Kim, Myeong-Hwan 대한치과기공학회 1980 대한치과기공학회지 Vol.2 No.1
This study was aimed at obtaining a desirable wax pattern for inlay. The method used was to analyze, mix, and heat several kinds of waxes, comparing the temperatures of their components. The result was Type C wax. In type C the amount of paraffin was generally contained(60$\sim$70%) was reduced to 45% and there was mixed 10%-15% of carnauba, which was intended for the wax not to soften readily at low temperatures. The type C has some advantages for general use: handy preparation, high safety, and economy. The inlay waxes commonly used contracted if the temperature fell from 38 to 28, but the contraction of type C was observed to be 0.2%$\sim$0.4% in proportion to the 10 fall. This was more characteristic in mixing.
Micromorphological Analysis of Primary Second Molar with Molar-incisor Malformation : A Case Report
김명환,박호원,이주현,서현우,Kim, Myunghwan,Park, Howon,Lee, Juhyun,Seo, Hyunwoo Korean Academy of Pediatric Dentistry 2021 大韓小兒齒科學會誌 Vol.48 No.3
Molar-incisor malformation (MIM)은 치관은 정상이나 치근의 비정상적인 형태를 보이는 것이 특징적이다. 제1대구치에 가장 많이 발생하며, 제2유구치나 상악 중절치도 때때로 이환된다. 이 증례 보고에서는 제1대구치를 포함해, 제2유구치에 MIM이 나타난 환자의 증례를 보고하고, 치근이 건전하게 발거된 제2유구치의 micro computed tomography (CT)를 이용한 형태학적 분석을 시행하였다. 발거된 치아에서는 MIM의 외형적 특징인 치관 - 치근 이행부의 cervical constriction을 육안상으로 확인할 수 있었으며, micro CT 분석에서 백악법랑경계부의 광화된 부위 (Cervical Minelarized Diaphragm), 많은 부근관과 막힌 근관 등의 복잡한 근관 형태, 근관 내 석회화 물질, 영구치에 비해 상대적으로 협착된 치관부 치수강이 관찰되었다. Molar-incisor malformation (MIM) is characterized by malformation in the root with a normal crown. While MIM mostly occurs in the permanent first molar, it has also been reported in the maxillary central incisor and the primary second molar (PSM), but anatomical analysis of the primary teeth with MIM has not been studied to date. In this case report, a patient with MIM was reported, and an extracted PSM with MIM was analyzed with micro computed tomography (CT). A cervical constriction morphology of the cementoenamel junction (CEJ) can be observed in extracted PSM. In micro CT analysis, characteristics such a mineralized plate (cervical mineralized diaphragm) in the CEJ area, complex root canal morphologies, a calcified mass inside the pulp chamber, and constricted pulp chamber of crown portion were observed.