밀링가공에서의 온도분포와 절삭력 예측을 위한 연구

강재훈,송준엽,박종권 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-

This paper presents a simple analytic method using 2D simulation program for predications of cutting force and machining temperature in dry type milling process. And also, comparison of cutting force and machining temperature obtained from experiment and simulation work is accomplished to distinguish of suitability.

回轉圓板法에 의한 下水處理에 관한 硏究

姜龍太,全裕燦,柳在益 東亞大學校 大學院 1986 大學院論文集 Vol.11 No.-

This study has been investigated about the actual applicational propriety for the theoretical equation which have been proposed, the relationship between h/a and factors, and the determination of disc area with h/a. The results carried out the experiment are the following: 1. When the final settlement tank was used, in the case of r=0.1 optimum submerged rate was 45% and Optimum Disc interval was 1cm. 2. Bod removal efficiency was inversely proportional to the submerged rate and the Disc interval. 3. Saturation constant, Area capacity constant, Microbial maximum growth rate, Yield constant, Attached active biomass:36 ㎎/ℓ, 90.3g/㎡·d, 3,9, 0.79, 19.06g/㎡, respectiverly. 4. The experiment value well corresponded to the Korneegay equation. 5. There was nearly no the substrate utilization by suspended microorganism because the experimental value well corresponded to the korneegay equation.

黃芩 抽出物이 DNCB로 誘導된 생쥐의 Allergy性 接觸皮膚炎에 미치는 影響

全宰弘,姜允皓 동국대학교 한의학연구소 1998 東國韓醫學硏究所論文集 Vol.7 No.1

본 실험은 황금이 Allergy性 접촉피부염의 면역과민반응 및 염증반응에 미치는 영향을 조사하기 위해서 시행되었다. 실험을 위해 BALB/C계 생쥐를 DNCB 처리군과 DNCB 처리 후 황금추출액을 경구 투여한 황금추출물투여군(HGET군)으로 나누어 2,4-dinitrochlorobenzene(DNCB)를 도포하여 Allergy性 접촉피부염을 유발한 뒤, 시간의 경과에 따라 contact hypersensitivity assay, 피부의 일반적인 구조 혈관생성, 림프구를 비롯한 염증세포, sulfated acid mucosubstance, 비만세포, IL-2 R, ICAM-1 그리고 CD11b의 변화를 관찰하였다. Contact hypersensitivity assay에서 HEGT군은 DNCB처리군에 비해 有意性있는 ear swelling의 감소를 보였다. 피부표피의 변화에서 HEGT군에서 DNCB처리군에 비해 감소된 것으로 나타났다. 또한 혈관생성, 림프구의 침투 및 표피 기저층과 가시층 세포치 손상은 HEGT군에서 DNCB처리군에 비해 감소된 것으로 나타났다. 또한 혈관생성, 림프구를 비롯한 염증세포, sulfated acid mucosubstance와 비만세포, IL-2 R 양성반응세포, ICAM-1 양성반응세포 그리고 CD11b 양성반응은 Allergy性 접촉피부염의 면역과민반응억제와 항염증작용에 효과가 있는 것으로 사료된다. This study was performed to investigated the effects of an immunosuppression and a mitigation of inflammation of Scutellaria baicalensis GEORGI on Allergic contact dermatitis. In order to study, after oral administration of Scutellaria baicalensis GEORGI extract, contact hypersensitivity assay, general morphologic change of skin, suIfated acid mucosubstance, mast cell, lL-2R, ICAM-1 and CD11b were observed in BALB/C mouse induced allergic contact dermatitis by the contact sensitizing DNCB. Ear swelling in contact hypersensitivity assay was decreased in the Scutellaria baicalensis GEORGI extracts administered(HEGT) group, compared with DNCB painted group. In the general morphologic change of skin, hyperplasia of keratinocytes, increase of lymphocytes and inflammatory cell, increase of vasculogenesis and epidermal lymphocytes infiltration, increase of cell damage in epidermal basal layer and prickle layer were decreased in the HEGT group, compared with DNCB painted group. Increase of sulfated acid mucosubstance, mast cell, lL-2R positive cell, ICAM-1 positive cell, CD11b positive cell were decreased in the HEGT group, compared with DNCB painted group.

자연 방사선량 중 우주선 기여 성분 정량 연구

전재식,오희필,하정우,오헌진,강인선 대한방사선 방어학회 1988 방사선방어학회지 Vol.13 No.2

자연 방사선 피폭선량 중 우주선 전리 성분의 기여를 정량하기 위하여 LiF TLD를 이용하여 약 1년반에 걸쳐 3개월 간격의 주기적 측정을 수행하였다. TLD는 세가지를 사용하였는데 그것은 칩과 PTFE원판형으로 된 두 가지의 ?LiF와 중성자 성분의 기여를 가려내기 위한 원판형의 ?LiF였다. 선량측정은 뱃지에 넣은 TLD를 충남대학교 대덕 캠퍼스의 한4층콘크리트 건물내 3층의 한 연구실에 설치한 10-15㎝ 두꼐의 납차폐 상자에 넣어서 90일 간격으로 다섯 주기 동안 수행하였다. 비교 연구를 위하여 3"Φ×3" 원통형NaI(T1) 섬광 검출기와 1024채널 MCA를 이용하여 3MeV 이상의 우주선 경성분에 대한 분광분석을 병행하였는데 그 결과 옥내 차폐체를 이용한 TLD측정치는 옥외 우주선 전리 성분의 약 75%를 측정하고 있음이 밝혀졌다. 이와 같은 차폐 손실을 보정한 TLD측정 결과에 의하면 충남대 대덕 캠퍼스 옥외에서 우주선 전리 성분의 기여는 34.3±1.1nGy-h¹로 나타났는데 이것은 이 측정 지점에서 예측할 수 있었던 선량 값과 매우 잘 일치하는 것이다. In order to quantify the contribution of cosmic-ray ionizing component to the dose given by natural background radiation, a series of measurement has been carried out using LiF TLDs for about one and a half years on quaterly basis. Three different types of LiF TLDs namely, chips and PTFE based disks of ?LiF, and the same disks of ?LiF for identifying possible contribution of neutron component were used. Measurements were made by placing badge-incased TLDs in a lead castle of 10 to 15㎝ thick installed in a room n the third floor of a four-story building in CNU Daedeok campus for 5 cycles of 90 days. For comparison a series of spectrometric study was also performed for the energy region over 3 MeV using a 3"Φ×3"NaI(T1) scintillation detector in association with an MCA of 1024 channels, and it was found that the data obtained by the TLDs placed in the lead castle indicate 75% of the dose given by outdoor cosmicray component. The results obtained by the TLDs through correction for shielding loss show that the outdoor dose contribution of ionizing component of cosmic rays at this campus is 34.3±1.1nGy/h which satisfactorily agrees with that expected for our particular location of measurement.

CAT용 스펙트럼 분석기 모듈에 적용한 인터페이스 설계및 구현에 관한 연구

전동근,강지훈,김재형 國立 昌原大學校 産業技術硏究所 1992 産技硏論文集 Vol.6 No.-

As factory automation is rapidly propelled, automatic manufacturing facility is developing widely. But the development of ATE(Automatic Test Equipment) is not reached than that of it. In this paper, we designed intermodule interface for measurment device for computer and CAT(Computer Aided Test) for automatic testing device of spectrum analyzer and implemented real time processing program for control of measurement device. OOP(Object Oriented programming) technique was used in control program to be interfaced with other measurement equipment easily. And we constructed of GUI(Graphical User Interface) method that can be used softwere for user.

PDA를 이용한 건설 현장업무의 효율 제고를 위한 연구

강민수,신규철,김재준 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

Information Technology is making rapid progress in other industries. However, construction industry is composed of various teams spreaded out to work in their place, so supply and demand on construction information within the appropriate time and the right place are becoming more important and control a successful completion of the construction project. Many researches have been conducted and operated in various construction work scope such as productivity management, logistics management, and so on. However the research concerned work scope that can be efficiently managed by using IT devices are insufficient. This study investigates how this technology especially PDA can be used to improve efficiency and effectiveness of construction management process. It classifies work scope into 9 catalogs based on PMBOK, and subdivides into 28 catalogs. This study propose the future works on PDA application in construction industry from the improvement effect's and applicability's point of view.

공작 기계의 신뢰성 평가를 위한 웹 기반 해석 프로그램 개발

강태한,김봉석,이수훈,송준엽,강재훈 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

Web-based analysis programs for reliability assessment of machine tools were developed in this study. First, the reliability data analysis program was developed to search for failure rate using failure data and reliability test data of mechanical part. Second, failure mode analysis was developed through performance tests like circular movement test vibration test for machine tools. This analysis program shows correlation between failure mode and performance test result. Third, tool life was predicted by correlation between flank wear and cutting time, using the extended Taylor tool life equation in turning data and the equivalently converted equation in order to apply ball endmill data to Taylor tool life equation in milling data. All the information related to input and result data can be stored in theses programs.

우심방을 침범한 거대 비호지킨씨 림프종 1예

강상범,진승원,이은경,박용현,최용호,김용주,박준철,김재형,홍순조,최규보,권종범,원용순,박건,이은희 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.4

용융염 전해정련 계에서 초 우라늄 대용물질로서 cerium dysprosium의 적용

강영호,황성찬,심준보,유재형 한국공업화학회 2003 공업화학 Vol.14 No.3

회토류원소 중 cerium과 dysprosium은 악틴족 원소와 염화물 생성 자유에너지의 차이가 크지 않기 때문에 분리하기가 매우 어렵다. 즉, 용융염을 사용 하는 전해정련 공정에서는 이들 회토류 원소가 악틴족 원소와 함께 석출되는 특성을 나타낸다. 이러한 성질을 이용하여 본 연구는 용융염을 전해질로 이용하는 전해정련실험에 cerium과 dysprosium금속을 초 우라늄원소의 대용 물질로 사용하여 그들의 모사 특성을 고찰하었다. 실험 결과 용융염 중 낮은 염화우라늄농도에서는 이 두 회토류 원소가 초 우라늄과 유사한 전해 특성을 나타냈으나, 높은 염화우라늄 농도에서는 회토류 원소의 거동을 보여주었다. The rare earth elements, especiaily cerium and dysprosium are very difficult to be separated from actinide elements due to their narrow differences in the Gibbs free energy of formation of chloride. That is, they are codeposited with actinide elements in electrorefining process with molten salt. Using this characteristics, present study discusses the feasibility for use of cerium and dysprosium metals to simulate the electrorefining characteristics of the transuranium. The experimental results show that the electrolytic behaviors of these two rare earth elements are similar with the transuranium in low concentration range of uranium chloride in molten salt. However, in high concentration range of uranium chloride they behave as the rare earth elements.

독성물질의 세포사 기전 및 세포사 유발물질의 검색법 개발에 관한 연구(Ⅰ) : 독성물질로 인한 파킨슨병 모델에서의 세포사 기전 연구 Study on the cell-death mechanisms of toxin-induced parkinsonism

강태석,김종민,서경원,김영옥,김준규,오재호,이윤동,김규봉,오정자,송연정,임종준,전범석,문전옥,최광식 식품의약품안전청 2000 식품의약품안전청 연보 Vol.4 No.-

MPTP 독성물질이 도파민성 신경세포에 선택적으로 작용하여 산화성 손상에 의한 신경세포사를 일으키는 것을 이용하여 파킨슨병의 동물모델을 만들고, 이를 통해서 아폼토시스를 비롯한 포사의 기전에 대한 연구 및 너코틴의 신경세포 보호효과 여부를 판정하는 실험을 병행하고자 하였다. 파킨슨꾐의 동물모델을 MPTf 독성 물질을 이용하여 확립하였으며, MPTP(30mgag, i.p.)를 투여한 후 1, 2,3, 4, 5일째 흑질 조직을 채춰하여 tarm로 박걸하여 tyrosine hydroxylase 면역조직화학염색을 수행하여 cell countif우한 결과, control은 57.635ce11s, 1일째 친.OfDells,2일째 57.9±6cells,3일릴 없.3±죠ells, 4일째 49.0츠3cells, 5일째 39.4±Scells료 4, 3일째 뚜렷한 신경세포 수의 감소를 보였다. 신경세포사 기전 규명을 위한 아폼토시스 분걱에서는 벼PTP 투여 후 1, 2, 3, 4, 5일째 조직을 채취하여 Hoechst staining, TUNEL staining을 수곡하였는데 양성 반응을 보인 신경세포는 관찰되지 않아. 아폼토시스로 인한 세포사가 관찰되지 않았다. bIPTP 파킨슨병 동물모델에서 nicotine 보호효과 탐색에 관한 실험은 nicat푸e 0.2mgAg을 5일 퐁안 투여 후 리『fP(30mgag)를 CS7Bt/6 마은스에 복강 내주사로 nicotine과 병용 투여한 후 1, 2, 3, 4, 5일째 뇌를 적출하땄다. 신경세포사가 뚜렷이 관찰되기 시작하는 4, 5일째의 신경세포 수의 감소 정도를 20. 30% 정도 약화시키는 경향을 보였으나, nicotine 보호효과에 대한 추가 실헝이 현재 수행 중에 있다. The cause of Parkinson's disease (PD) is largely unknown. However, free radical toxicit? may plaf a role ip. the degeneration of substantia nigra, which is the Hajorfocus of pathological damages in PD. Recently, a neuroprotective effect of nicotine in PD has been suggested. Therefore, the mechanism of neurodegenerafion and protective potential o( nicotine in PD were investigated in the experimental modeB of Pll using a neurotoxin, C57BL/6mice were administered with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP, 30 mg/kg,j.p.). The degree of neurodegenerafion was determined by immunohistochemical stainiHB oftyrosine hydroxylase (TH). TH-positive cells on nigral sections were found 56.0 ±4, 57.9 ±6,52.315ce11s, 49.0±3cells, and 39,4±Scells at days 1, 2, 3, 4, 5, respectively (controls : 57.6±Scells). Hoechst and TUNEL staining showed no evidence of apoptosis. The exandnation on themice co-adrunistered with nicotine(0.2mgAg) and MPTP(30mgag) revealed a tendency ofnicotine protective effects. At days 4 and 5, the degree of TH-positive cells was decreased by20-30%, In corclusiffn, the role of apoptosis was not evidenced in this MPTP modeB of PB.The possible proteccon by nicotine should be elucidated with further studies.