고속 HMC 이송계의 운동특성 평가 및 운동오차 예측

최헌종,허남환,강은구,이석우,홍원표 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

Recently, the evolution in production techniques (e.g. high-speed milling) and the complex shapes involved in modern production design has been increasingly popular. The key to the achievement is a drastic improvement of the dynamic behavior of the machine tool axes used in production machinery. The more complex these tool paths the higher the speed and acceleration requirements. But it is very difficult to reach the target for high speed machine tool because of the limitations of servo system and motion control system. However the direct drive design of machine tool axes, which is based on linear motors and which recently appeared on the market, is a viable candidate to meet the ever increasing demands, because of these advantages such as no backlash, less friction, more mechanical simplicity and very higher acceleration and velocity comparing to the traditional system. This paper focused on the performance tests of the high speed horizontal machine tool based on linear motor. Especially, dynamic characteristics were investigated through circular test and circular form machining test is carried out considering many important parameter. Therefore these several experiments is used to be evaluated the model for prediction of circular motion error and circular machined error.

실기간 운영 체제의 성능 평가를 위한 벤치마크 프로그램의 개발

최석원,강희국,박윤용 선문대학교·중소기업기술지원연구소 1998 선문공대 연구/기술 논문집 Vol.3 No.1

시판어묵의 관능적, 기계적 조직감 측정방법간의 비교

최원석,정재현 忠州大學校 2003 한국교통대학교 논문집 Vol.38 No.2

The optimum conditions for the measurement of texture profile of commercial Kamabokoes were investigated by Texture analyser and the data were compared to those of sensory evaluations. Significant correlations between sensory evaluation and mechanical measurement were observed in hardness, cohesiveness, chewiness and gumminess. The optimum conditions for the mechanical measurement instead of sensory evaluations of Kamaboko were the 70% compression ratio with a flat probe(φ 24.6 mm) at 2.4 mm/s cross head speed

국산 체외 충격파 쇄석기의 음향학적 특성 평가

최민주,이종수,김성삼,조성찬,양형석,손종수,천원기 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2

In the study we measured and evaluated the acoustical property of a domestic spark gap type extracorporeal shock wave lithotripsy (ESWL). Altering the discharging medium between the electrodes of the shock wave generator (water, 1% an 10% NaCl electrolyte), we measured shock waveforms and sound pressure level (SPL). For the shock waves produced using the discharging medium, water, it was seen that the shock wave peak pressure went up to 70 MPa, and the SPL was in the range of 90 - 100 dB. As the concentration of NaCl increased in the electrolyte. the SPL did not change much and was shown to increase correlation with the discharging voltage. In the case of the discharging medium. 10% NaCl electrolyte, it was found that the shock amplitudes varied in a narrow range when being high in the concentration of NaCl and were large when being high in discharging voltages. While the stone fragmentation was in process, we measured the acoustic emission and compared their spectral properties.

FIB를 이용한 나노가공공정 기술 개발

최헌종,강은구,이석우,홍원표 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-

The application of focused ion beam (FIB) technology in micro/nano machining has become increasingly popular. Its use in micro/nano machining has advantages over contemporary photolithography or other micro/nano machining technologies, such as small feature resolution, the ability to process without masks and being accommodating for a variety of materials and geometries. This paper presents that the recent development and our research goals in FIB nano machining technology are given. The emphasis will be on direct milling, or chemical vapor deposition techniques (CVD), and this can distinguish the FIB technology from the contemporary photolithography process and provide a vital alternative to it. After an introduction to the technology and its FIB principles, the recent developments in using milling or deposition techniques for making various high-quality devices and high-precision components at the micro/nano meter scale are examined and discussed. Finally, conclusions are presented to summarize the recent work and to suggest the areas for improving the FIB milling technology and for studying our future research.

한의진단명과 진단요건의 표준화 연구 III : 3차년도 연구결과 보고

최선미,양기상,최승훈,박경모,박종현,심범상,김성우,노석선,이인선,정진홍,이진용,김달래,임형호,김윤범,박성식,송태원,김종우,이승기,최윤정,신순식 한국한의학연구원 1997 한국한의학연구원논문집 Vol.3 No.1

The diagnostic requirements were suggested and explained regarding the systems of differentiation of symptoms and signs in the third year study of standardization and unification of the terms and conditions used for diagnosis in oriental medicine. The systems were as follows : - analyzing and differentiating of epidemic febrile disease - analyzing and differentiating in accordance with the Sasang constitution medicine based on four-type recognition - differentiation of disease according to pathological changes of Chong and Ren channels - standards for diagnosis of women's disease - standards for diagnosis of children's disease - standards for diagnosis of motor and sensor disturbance (-muscle. born, joint, etc.) - standards for diagnosis of neuropsychiatric disease - standards for diagnosis of five sense organ disease - standards for diagnosis of external disease The indivisual diagnosis pattern was arranged by the diagnostic requirements in the following order : another name, notion of diagnosis pattern, index of differentiation of symptoms and signs, the main point of diagnosis, analysis of diagnosis pattern, discrimination of diagnosis pattern, prognosis, a way of curing a disease, prescription, herbs in common use, disease appearing the diagnosis pattern, documents. The standards for diagnosis of each disease was arranged by the diagnostic requirements in the following order : another name, notion of disease, the main point of diagnosis, analyzing and differentiating of disease, analysis of disease, discrimination of disease, prognosis, a way of curing and prescription of disease, disease in western medicine appearing the disease in oriental medicine, documents.

충남지역 석불의 암석학적 풍화특성에 관한 연구

최석원,채상정,이효민 공주대학교 문화재보존과학연구소 2003 문화재과학기술 Vol.2 No.1

충청남도내의 중요문화재로 지정된 석불 중 역사적 중요성을 가지고 구조적으로 보아 위험성이 있는 것으로 판단되는 석불 31개를 대상으로 암석학적 특징, 풍화에 의한 암석의 조직 및 광물학적 변화, 풍화에 따른 물성 변화 등, 석불을 이루고 있는 암석의 풍화특성을 파악하였다. 석불을 이루고 있는 암석은 대부분이 중립 내지 조립질의 화강암류이며, 소수 석불만이 편마암으로 이루어져 있다. 시료채취가 가능한 12개 화강암류 석불의 모드분석 결과, 흑운모화강암 8개, 반상화강섬록암 3개, 화강섬록암 1개로 분류되었다. 이것들은 암석자체에 많은 절리, 박리조직과 심한변색을 보이고 있다. 편광현미경하에서의 관찰 결과, 장석류는 견운모화작용이 심하고, 흑운모는 녹니석화작용으로 주변광물을 변색시키며, 석영은 일정한 방향으로 균열이 발생하는 등의 조직변화가 일어나고 있다. 석불을 구성하고 있는 암석은 풍화가 많이 진행되어 카올리나이트화 되었으며. 풍화등급은 MW에서 HW에 속한다. 따라서 대부분의 석불들은 풍화를 많이 받은 상태이고, 각 석불의 풍화특성을 고려하여 과학적이고 비파괴적인 보존방법이 연구되어야 할 것이다. This study was carried out the survey of the petrological weathering characteristics as the petrological texture and the mineralogical alteration and the change of rock physical properties by weathering for 31 Stone-Buddhist images designed as important cultural property in Chungnam province. Most rocks composing Stone-Buddhas are classified into granite which is medium to coarse, but some Stone-Buddhist images comprise in gneiss. As the result of modal composition for 12 Stone-Buddhist images being possible to take samples, they are classified into 8 biotite granite, 3 porphyritic granodiorite and 1 granodiorite, which are showed with many joints, exfoliation and intensive discoloration. Referring to the result of observation under the polarizing microscope, some feldspar are being sericitizated and some biotite are being changed to chlorite Under the observation with SEM, some feldspar are changed into lamella-kaolinite by the weathering. Most rocks composing the stone Buddhist images are being weathered much and kaolinited, and its weathering level is classified into MW to HW referring to the result of these studies. Accordingly it is required studying scientific and undestructive method considering the weathering distinction of Stone-Buddhist images.

사후분해 시체에 대한 법의학적 접근

최영식,이상용,김유훈,조갑래,이봉우,양경무,정낙은,서중석,이한영,이원태,강현욱 大韓法醫學會 2000 대한법의학회지 Vol.24 No.2

Disposal of a homicide victim by dismemberment is rare, but individual cases are on record in most major medicolegal departments. Recognition of postmortem mutilation may be of importance in the interpretation of certain murders committed by sexual perverts and other mentally deranged individuals and sometimes performed for the sole reason of easier disposal of the body. Postmortem dismemberment is usually readily recognizable as such; The edges of the injuries are dry and lack evidence of bleeding. The joints may be disarticulated without fracture, or the use of an axe or saw may be evident from examination of bones. Parallel horizontal or oblique furrows in the bone surface are caused by skipping of the saw prior to establishing depth. Such patterns on the bone may assist in identifying the particular saw involved. So we report 25 dismembered corpses that autopsied in National Institute of Scientific Investigation. This paper can help in attempting to establish not only the first criminal investigation steps but also the medicolegal approach methods in unidentified and dismembered deaths.

혐기 및 2단 교호(交互) 간헐포기조를 이용한 하수고도처리에 관한 연구 : 파일럿 규모의 실험결과를 중심으로 A Pilot-scale Study

최용수,홍석원,권기한 한국물환경학회 2004 한국물환경학회지 Vol.20 No.3

The performance of a newly designed wastewater treatment process equipped with an anaerobic and two intermittent aeration tanks operated alternately was investigated. During the experimental period, several types of cyclic operating schedules with different aeration and non aeration time were examined for the optimization. At all modes, the removals of organic matter and SS were highly achieved. With respect to T-N removal, however, the cycle length for aeration on/off affected the efficiencies. At the optimal operating mode, the ORP bending point indicating the disappearance of nitrate was observed. Considering the influent wastewater characteristics and cyclic operating schedules, it can be suggested that T-P removal is much more BOD/T-P ratio and/or its load dependant rather than the aeration on/off time. The results obtained from pilot-scale test showed the competitive advantage of this alternating process through an omission of nitrate recycle and operational flexibility against influent load variations when comparing with other continuous flow processes.

Aspergillus oryzae를 이용한 캡슐형 메주의 품질특성

최재훈,권선화,이상원,남상해,최상도,박석규 한국식품저장유통학회 ( 구 한국농산물저장유통학회 ) 2003 한국식품저장유통학회지 Vol.10 No.3

전통메주의 표면에서 발행하는 야생곰팡이 착생, 유해곰팡이에 대한 mycotoxin 생성 및 메주 표면의 과도한 건조 등을 해결하기 위하여 메주 외층에 Aspergillus oryzae로 만든 쌀 종국(0.3%, w/w)을 혼합시킨 증자 검정콩으로 얇게 코팅한 후, 25℃, 상대습도 80%에서 14일간 발효시킨 캡슐형 메주를 개발하였다. 캡슐형 메주의 표면에서 야생곰팡이의 오염은 발견되지 않았으나, 대조구 메주는 12일 이후에 푸른곰팡이가 많이 관찰되었다. 메주의 수분 함량은 평균 32.7%로서 34.7~29.4%의 범위를 나타내었다. 적정산도는 캡슐형 메주가 대조구 메주보다 높게 나타났으며, 대두 캡슐형 메주와 검정콩 캡슐형 메주는 비슷하게 나타났다. 유리당의 함량은 검정콩 캡슐형 메주가 123.98㎎%로 대조구 메주 15.02㎎%와 대두 캡슐형 메주 59.85㎎%보다 각각 10배, 2.1배, 높게 나타났다. 아미노산성 질소의 함량은 대조구 메주에서 147.00㎎%였으며, 검정콩 캡슐형 메주는 255.50㎎%로서 대두 캡슐형 메주 187.25㎎%보다 약 1.37배 높은 함량을 나타내었다. 총 유기산의 함량은 캡슐형 메주(대두 119.98㎎%, 검정콩 95.94㎎%)가 대조두 메주(26.44㎎%)보다 함량이 높게 나타났으며, 캡슐화에 따라 lactic acid와 malic acid 가 가장 큰 변화를 나타내었다. 색차계 색도는 검정콩 캡슐형 메주가 대두 캡슐형 메주보다 명도값(L)이 크게 나타났으며 지방산 조성은 메주의 종류에 따라 큰 차이를 나타내지 않았다. 총 유리 아미노산의 함량은 검정콩 캡슐형 메주(1039.70㎎%)가 대두 캡슐형 메주 (556.07㎎%)와 대조구 메주(236.45㎎%) 비하여 각각 2.4배, 4.4배 높았다. In order to improve some problems such as contamination of undersirable mold, mycotoxin production and excessive drying on the surface of traditional meju, we developed a capsule type-meju(CM) coated with steamed black bean and Aspergillus oryzae - rice koji(0.3%, w/w) mixture to surface of traditional meju and fermented at 25℃ for 14 days under 80% relative hunmidity. Contamination of undersirable mold on the surface of CM was not detected within 2 weeks and some genus Penicillium molds on control meju without koji were found naturally after 12 days of fermentation. The moisture content of meju was showed to be in the range of 34.7 - 29.4% being 32.7(w/w) of mean value. Titratable acidities in CMs prepared with black bean(BCM) and soybean(SCM) were much higher than that in control meju, and BCM was similar to SCM. Free sugar content in BCM(123.98 ㎎%) was 10 times and 2.1 times higher than that in control meju(15.02 ㎎%) and SCM(59.85㎎%), respectively. Amino type nitrogen content in control meju was 147.00 ㎎% and its content in BCM(255.50㎎%) was 1.37 times higher than that in SCM(187.25 mg%). Total organic acid content in BCM(95.98㎎%) and SCM(119.98㎎%) were much higher than that in control meju(26.44 ㎎%), and then latic and malic acid contents were markedly changed according to capsulation of meju. Lightness value(l) of Hunter color index was much higher in BCM than in SCM. Fatty acid composition of CM was not different as compared to control meju. Total free amino acid content in BCM(1039.70 ㎎%) was 4.4 times and 2.4 times higher than that in control meju(236.45 ㎎%) and SCM(556.07 ㎎%), respectively.