척수를 절단한 흰쥐에 태생기의 Serotonin을 함유한 솔기핵을 이식한 후 척수의 형태학적 재생 및 기능에 관한 연구

김종중,정윤영,장인엽,정주현,문정석,김흥중 대한해부학회 1995 Anatomy & Cell Biology Vol.28 No.6

전환전략: Marriott 기업의 리스트락쳐링에 관한 사례연구

오흥철,김시중 우송대학교 1997 우송대학교 논문집 Vol.2 No.-

현재의 복잡하고 급변하는 기업환경하에서 경영상 심각한 어려움에 처해있는 많은 기업들을 볼 수 있다. 특히 호텔산업에서도 기업 도산이라는 최악의 상태로 까지 가는 경우를 흔히 접하게 된다. 그러나 어려움에 처한 기업이라고 반드시 도산한다고는 볼 수 없다. 쇠퇴의 이유에 대한 정확한 인식과 적절한 전환전략의 사용으로 기업은 회생할 수 있게 된다. 기업의 쇠퇴기에서 회복국면으로의 전환에 관한 학문적인 접근의 필요성에도 불구하고, 호텔산업분야에 있어서 전환전략들에 관한 체계적인 연구는 아직 미흡하다고 볼 수 있다. 본 연구의 목적은 기존 연구 문헌 조사와 현재 리스트락쳐링(기업구조개편) 중에 있는 미국의 MARRIOTT 기업에 대한 사례연구를 통해 전환전략개념을 이해하는 데 있다. On the current complex and volatile environment, many hospitality companies are confronting severely declining performance and are in serious trouble. However, troubled companies are not usually destined to fail: a successful turnaround is possible by understanding the cause of decline and using proper turnaround strategies. In spite of the increasing need of in-depth study on corporate turnarounds, yet there is a lack of systematic analysis about turnaround strategies in hospitality industry. The purpose of this paper is to synthrsize strategic concepts concering turnaround strategies through literature review and case study of Marriott corporation which is under restructuring.

치수제거후 흰쥐 삼차신경절에서 VIP 면역반응세포의 변화: 공초점레이저주사현미경적 연구

김흥중,김승재,박주철,박주철,이상호 대한소아치과학회 2001 大韓小兒齒科學會誌 Vol.28 No.1

말초신경 손상에 의한 VIP의 변화를 연구하기 위해 흰쥐 하악대구치 치수제거 후 삼차신경 절에서 VIP의 분포 및 반응강도를 공초점레이저주사현미경을 이용하여 관찰하였다. 체중 200g내외의 Sprague-Dawley계 흰쥐를 대조군과 하악대구치 치수제거 후 14일군으로 분리하여 희생시켰다. 1차 항체로 rabbit anti-VIP, 2차 항체로 fluorescein isothiocyanate(FITC) conjugated anti-rabbit IgG를 사용하여 면역형광염색을 시행한 후 공초점레이저주사현미경으로 관찰하여 다음과 같은 결론을 얻었다. 1.삼차신경절 하악부위에서 VIP 양성반응세포의 비율은 대조군에서 7.40%를, 실험군에서는 28.42%를 보였다. 대조군에 비해 실험군에서 양성반응세포의 증가를 보였다. 2.삼차신경절 하악부위에서 VIP 면역반응세포체에 대한 상대성 형광강도는 대조군에서 87.78을, 실험군에서는 138.65를 보였다. 대조군과 비교하였을 때 실험군에서 상대성 형광강도의 증가를 보였다. 3.실험군의 광연속절편(1㎛) 관찰에서 VIP 면역반응세포는 9개의 절편 대부분에서 강하게 나타났다. 축삭의 면역반응을 살펴보면, 대조군의 축삭에서는 약한 반응을 보였으며, 실험군의 축삭에서는 강한 면역반응을 보였다. 또한 양성반응 세포체의 크기는 20∼25㎛의 중간 크기의 세포체에서 강한 면역반응을 보였다. 위의 결과로 보아 치수제거 후에 삼차신경절 하악부위에서 VIP면역반응세포의 증가와 함께 상대성 형광강도가 높아졌음을 알 수 있었다. The purpose of this study was to investigate the distribution and fluorescence intensity of vasoactive intestinal polypeptide immunoreactive(VIP-IR) cells in rat trigeminal ganglion following pulp extirpation of rat mandibular molar. The animals were divided into control group(n=6) and experimental group(n=6). The experimental animals were sacrificed at 14 days after pulp extirpation. The trigeminal ganglion was removed and immersed in the 4% paraformaldehyde in 0.1M phosphate buffer. Serial frozen sections about 20㎛ in thickness were cut with a cryostat The immunofluorescence staining was performed. The rabbit anti-VIP(1:8,000) was used as primary antibody and fluorescene isothiocynate(FITC) cojugated anti-rabbit IgG(1:80) as secondary antibody. The slides were observed under confocal laser scanning microscope(CLSM). Unprocessed optical sections were obtained and stored on a optical disk. Color pictures were printed by a video copy processor. The results were as follows ; 1. The positive ratio of VIP-IR cells in mandibular part of trigeminal ganglion were 7.40% in control group and 28.42% in experimental group(14 days affter pulp extirpation). 2. The relative fluorescence intensity of VIP-IR cells in mandibular part of trigeminal ganglion were 87.78 in control group and 138.65 in experimental group. The relative fluorescence intensity of experimental group was 58% higher than that of control group. 3. In optical serial section analysis of VIP-IR cells of experimental group, most of the 9 section showed high fluorescence intensity. At high magnification, axons of the experimental group displayed greater VIP-IR than in the control group, and the positive cells were mainly of medium size. The result indicate that number and fluorescence intensity of VTP-IR cells were increased in the mandibular part of trigeminal ganglion following pulp extirpation of mandibular molar, and it suggests that VIP could play a role in processing of nociception.

우리나라 先物換制度의 活成化 方案

姜興中 건국대학교 1984 商經論叢 Vol.- No.19

국민연금기금의 복지관광사업 투자평가를 위한 비용·편익분석 모형에 관한 연구

김시중,오흥철 우송대학교 1997 우송대학교 논문집 Vol.2 No.-

The objective of this study was to help decision-makers to be able to make a decision on a social tourism investment, based on the reasonable estimate standard. This was possible by introducing the estimate method for the effectiveness of investment on social tourism project and by using this method on the analysis of the alternative investment projects. For the analysis and estimate of welfare tourism investment, the advanced cost-benefit model was developed, based on the previous traditional cost-benefit analysis. This new cost-benefit model supplemented the weakness fo traditional cost-benefit model by utilizing the concept of total-social-benefit and total-social-cost.

Fusobacterium nucleatum의 테트라사이클린 내성여부를 검사하기 위한 세균배양법과 중합효소연쇄반응법의 비교

최재흥,성진효,국중기,김동기 대한구강보건학회 2003 大韓口腔保健學會誌 Vol.27 No.4

The purposes of this study were to identify the detection and incidence of tetracycline resistance determinant tet(M) by PCR method and to evaluate the availability of PCR method guided for clinical use of antibiotics in dentistry. Subgingival plaque samples were collected from 172 sites of 29 patients. Both original sample and subculturd sample, PCR amplification was used to detect tet(M) in Fusobacterium nucleatum. The percentage of tet(M)-positive subjects and sites in original samples were 100%, 95.9%, respectively. And the percentage of tet(M)-positive subjects and sites in subcultured samples were 17.2%, 3.5%, respectively. In subcultured samples, probing pocket depth and clinical attachment level in tet(M)-positive sites were higher than in negative sites (p<0.05). The sensitivity and specificity of PCR method compared with broth dilution method as a gold standard were 0.91 and 0.86, respectively. The results suggested that tet(M) assay using PCR method was available to detect the tetracycline-resistant F. nucleatum.

榮山湖 上流支術의 水質에 관한 硏究 : 極藥江을 中心으로 On the Geuk-Rak river

朱興珪,文大中 조선대학교 약학연구소 1992 藥學硏究誌 Vol.14 No.1

Physico-chemical and microbiological research of water quality of Geukrak River, on of the three tributary streams of the upper stream from Lake Youngsan, was performed in February 1992, on March 1992, and results are obtained from this research as the following: 1. The pH of the whole research area is 7.0 to 7.6, comparatively homogeneous of all area, which says that there is no special factors to change the pH around Geukrak River noticeably. 2. The DO is 5.7ppm to 9.0ppm at the first observation, and 5.4ppm to 8.8ppm a little bit lower at the second observation, but it is distributed in similar pattern througout all research area. 3. The BOD is 2.9ppm to 3.7ppm except Site l and Site 3 during the whole research period, that makes comparatively stable quality of lake water. But it is 4.1ppm and 4.8ppm at Site l, and 4.7ppm at Site 3, owing to the influence of various untreated organic substances from the outlets of the urban life sewage treatment plant of Kwangju City. 4. Except Site 2 and Site 3, 1.0ppm to 5.8ppm of NH_3-N, 0.08ppm to 0.29ppm of NO_2-N, 1.15ppm to 3.20ppm of NO_3-N, and 0.01ppm to 0.04ppm of PO_4-P are observed, all comparatively low. But NH_3-N and PO_3-P are observed to be 5.5ppm to 8.0ppm, 8.3ppm to 10.5ppm, and 0.06ppm to 0.08ppm at Site 2 and Site 3, higher than other areas due to the same cause as in case of BOD. 5. Each of Cl-ion and Hareness are 27.02ppm to 36.87ppm and 22.40ppm to 37.52ppm, respectively, at the first observation, and 33.01ppm to 41.48ppm, and 44.14ppm to 76.01ppm, respectively, at the second observation. A little bit of increase is found at the second observation from the first observation, but it is considered that this increase is not due to dangerous point source contamination, compared to other rivers, but maily due to the quality of soil. 6. Normal bacteria and E. Coli are 1.8×10^2 to 2.4×10^4, and 1.2×10^2 to 1.9×10^4 over the whole research area. It shows diverse distribution, but pretty low compared to other rivers. However, 2.2×10^3 to 1.9×10^4 of E. Coli analyzed from Site l to Site 3. and this fact draws special attention to the management of water quality of Geukrak River, considering that these sites are the closest to the main stream of Lake Youngsan.

Microprocessor를 利用한 直流電動機의 速度制御

金玉中,李興浩 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.2(B)

This paper is concerned with the seperately excited dc motor speed control using a microprocessor. The voltage, necessary for dc motor drive, is adjusted by a chopper and its control circuits are fired with digital circuits. Therefore, no D/A converter is needed between power circuits and a microprocessor. A voltage that relates to the motor speed, is measured through a tachogenerator. The analog voltage, measured through a tachogenerator, is converted into the digital signal by the A/D converter and the converted digital signal goes into the microprocessor. For the purpose of maintaining tho motor speed constant, the digital signal is compared with a reference setting, and the error is used to adjust the on-off time of the chopper. Throughout the experiments, we recognized that the dc motor reaches at the desired speed rapidly and maintains the reference speed in spite of a variable load.

GC 연삭숫돌을 이용한 탄소섬유 에폭시 복합재료의 평면 연삭특성에 관한 연구

한흥삼,윤혁중,이동주 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.4

Since carbon fiber epoxy composite materials have excellent properties for structures due to their high specific strength, high specific modulus, high damping and low thermal expansion, the hollow shafts made of carbon fiber epoxy compos-ites have been widely used for power transmission shafts for motor vehicles, spindles of machine tools, motor base, bear-ing mount for tool up and manufacturing. The molded composite machine elements are not usually accurate enough for mechanical machine elements, which require turning, drilling, cutting and grinding. The experiment are surface grinding of the grinding wheel GC60 to the car-bon fiber epoxy composite specimen with respect to stacking angle [0]_nT, [45]_nT, [90]_nT on the CNC grinding machine. In this paper, the surface grinding characteristics of composite plate, which are surveyed experimentally and analytically with respect to the grinding force, surface roughness and wheel loading according to the variable depth of cut, wheel velocity and table feed rate are investigated.

X-관련성 만성육아종성질환의 진단을 위한 PMA-activated NBT 검사

김중곤,조한익,오흥범,김의종,최강원 대한감염학회 1996 감염 Vol.28 No.1

목적 : Activated NBT 검사는 만성육아종성질환을 선별하는 검사이다. 활성제로 PMA를 사용하면 X-linked CGD의 경우 보인자를 감별할 수 있다. 방법 : CGD의 가족력을 부인하는 정상인 30명을 대상으로 PMA activated NBT 슬라이드 검사를 실시하여, 정상대조에서의 formazan 형성율을 보았으며, 동일 검사를 CGD가 강력히 의심되는 환자와 그 가족에 대하여 실시하였다. 결과 : 정상대조 30명 전원에서 98% 이상의 formazan 형성세포가 관찰되었다. 환자에게 실시한 결과 세환자 모두에서 0%의 결과를 보였다. 환자의 어머니에서는 각각 57, 70, 67%의 결과를 보였다. 결론 : 본 연구를 통하여 세 환자는 X-관련성 만성육아종성질환이라는 진단을 내릴 수 있었다. PMA activated NBT 슬라이드 검사는 시행하기가 쉽고 재현성이 좋으므로, 어러 검사실에서 소아기 면역결핍증을 선별하는 검사의 하나로 시행되는게 바람직하다고 사료된다. Background : Chronic granulomatous disease(CGD) is uncommon inherited disorder in which phagocytic cells fail to produce antimicrobial superoxide(O₂) due to NADPH oxidase deficiency. This disease can be easily screened by activated nitroblue tetrazolium(NBT) test. In case of X-linked CGD, carriers also can be detected. Methods : PMA(phorbol myristate acetate) activated NBT test was performed as previously described. Test performance was evaluated in 30 normal persons who denied family history mimicking CGD. Test was also applied to the three strongly suspected cases of CGD. Two of the cases were 12 year old boy and 7 year old boy, who suffered from many infectious diseases since 6 month old and 4 month old, respectively. The other remaining case was 22 year old man who suffered from many infectious diseases since 6 year old, but now relatively in health compared to the other two cases. Results : More than 98% formazan formation was observed in all normal controls. No formazan positive cell was shown in all of the three patients. However, applied to the mothers, the test revealed 57%, 70%, 67% positive cells, respectively. Conclusion:X-linked transmission of CGD could be determined with the results of PMA activated NBT slide test. This test can be easily performed. It would be better to do this test routinely as one of the tests for the screening of the immmunodeficiency syndrome in childhood.