차영상을 이용한 홍채 변화 분석

김남식,김장형 제주대학교 공과대학 첨단기술연구소 2004 尖端技術硏究所論文集 Vol.15 No.2

In this paper, time, studied about method that can analyze iris change to using differential image of iris image that put interval and films and utilize as patient's health examination according to iris change. Time, Differential image of iris image that put interval and films can be used usefully to search early diagnosis of disease and unfolding process etc.. of disease by showing definitely change by time. In the case of iris diagnostic system, iris outside area extracts iris area and uses Differential image of before filming image and image that film present to use canny edge detector as there is cay to extract iris area as do not help in diagnostic and change analyzed comparison.

Ni-4.5%Al 피복강재의 마모특성

김귀식,오맹종,김성익,고장권 濟州大學校 産業技術硏究所 1997 산업기술연구소논문집 Vol.8 No.1

The pin-on-disk type wear testing machine was manufa tur dusing a personal computer. load cell and reduction motor. The tribological properties of Ni-4.5%Al coating steel by flame spray were investigated using this test machine. The experimental result has shown that the wear amount of coating steel was remarkably decreased than the S45C material. In the lubrication environment the wear amount was much less. The friction coefficient of S45C and coating material was respectively 0.4, 0.29 in the air, and it has respectively shown 0.18. 0.24 in the lublication. Increase of load didn't have effect on the change of the friction coefficient at all.

한국 관광교통의 발전방안

이장춘,홍창식 경기대학교 부설 소성종합관광연구소 2002 여가관광연구 Vol.6 No.-

Although tourism has been studying phenomenon of human movement, it has had a little research in field of tourism transportation. This study tried to establish the theological foundation about tourism transportation as a infrastructure of tourism system. And this study analyzed tourist propensity to use tourism transportation. This study suggested five developing plans of Korea tourism transportation, such as building the linked tourism transportation, making a specialized tourism transportation products, developing tourism transportation based on local region itself, improving the quality of tourism transportation service and consolidating tourism road system. it should be studied to analyze concrete problems of tourism transport. Hensforth, ation related to each transportation and local region.

Ni-4.5%Al 피복강재의 마모특성

고장권,김성익,오맹종,김귀식 濟州大學校工科大學産業技術硏究所 1997 尖端技術硏究所論文集 Vol.8 No.1

The pin-on-disk type wear testing machine was manufactured using a personal computer, load cell and reduction motor. The tribological properties of Ni-4.5%Al coating steel by flame spray were investigated using this test machine. The experimental result has shown that the wear amount of coating steel was remarkably decreased than the S45C material. In the lubrication environment the wear amount was much less. The friction coefficient of S45C and coating material was respectively 0.4, 0.29 in the air, and it has respectively shown 0.18, 0.24 in the lubrication. Increase of load didn't have effect on the change of the friction coefficient at all.

Cs-137 γ-선 조사장치의 방사선장 해석연구

전재식,채하석,이철영,오장진,이병영,명동범 충남대학교 기초과학연구소 1995 忠南科學硏究誌 Vol.22 No.1

In reference to the ISO-4037 and ANSI N13.11, appropriateness of the shielding and collimating system, and suitability of the irradiation and its environmental conditions of a 20 Ci Cs-137 gamma-ray irradiator installed in Korea Institute of Nuclear Safety(KINS) were investigated. Upon the installation of the irradiator, condition of collimator alignment and virtual beam cross section were examined by use of a portable He-Ne laser. In order to evaluate the fitness of the secondary(scattered) to primary ratio of the collimated gamma-ray beam from the irradiator in light of ISO and ANSI requirement, the measurements of the secondary to primary ratio were performed by use of a cavity type ion chamber which had been calibrated in a calibration laboratory that maintains reliable traceability. For the theoretical assessment of the gamma-ray field the collimated beam were divided into fifteen sectors and for each sector the secondary to primary ratio and the gamma-ray spectrum was simulated by means of Monte Carlo method. The outcomes were compared with the experimental results, and cause of scattering and the existence of alleged modifying factors in the irradiator were examined.

관광교통의 지역관광 영향분석모형 연구

홍창식,이장춘 한국관광정책학회 2002 觀光政策學硏究 Vol.8 No.3

This study pointed to the lack of theory study on tourism transportation that is necessary to movement of tourist, the lack of method of environment and analysis on regional tourism such as Kyoungbu Express Railway(KTX) and local tourism strategys shortcomings that is prepare for opening of KTX as a national HUB traffic network. In this study analyzed Tourism transportation theory and Express Rail theory and it used the Cost-Benefit theory as a theory of tourism traffic effects on regional tourism. As a result of theory study, research model that is transformed from the cost-benefit analysis that was used on Ph. D. Lee, Chang-Choons study and WTO's report is made clear up. In the aspect of maximize of benefits and minimize of costs, it suggested regional tourism development that explains regional tourism strategy. (regional tourism market, company, resources and products, transportation system and tourism environment) This study is worth knowledge as follows. First, it suggested theological base for tourism related studies by establishing theological system about tourism transportation and KTX. Second, this study used the cost-benefit analysis when it analyzed the effects of national SOC business on tourism, so it could suggest the reasonable approach method to study this kind of studies in the future.

EDTA의 적용 온도와 시간에 따른 도말층의 제거양상

신장식,조용범 大韓齒科保存學會 2002 Restorative Dentistry & Endodontics Vol.27 No.5

The purpose of this study was to evaluate the effect of EDTA irrigant according to application time and temperature. 31 human mature extracted teeth with a single canal were sectioned with microtome in 3mm thickness and gained 62 samples of root canals. They were distributed randomly into 6 groups of 10 specimens each and control group of 2 specimens. Each specimens was prepared with GT rotary file (Dentsply, Mallefer Co., Swiss) and irrigated with 3 ml sodium hypochlorite every minute. Then smear layer was removed with EDTA solution (PULPDENT®, PULPDENT Co., USA.) except two control specimens. Specimens of each group were irrigated with 17% EDTA. The time and temperature of application were as follows: <본문참조> All specimens were split longitudinally and prepared for examination by scanning electron microscopy. A set of reference micrographs was used to award a debris score as follows: 0 = no smear layer, all tubules clean and open; 1 = no superficial smear layer, tubule openings visible, but some contain debris plug or soft tissue remnants; 2 = moderate smear layer, some tubules open and others closed; 3 = heavy smear layer, most/all tubule openings obscured. Results were evaluated with Kruskal-Wallis test to determine whether there was statistically significant difference among six groups. Pairs of groups were analyzed using the Student-Newman-Keuls Method and Mann-Whitney test.. The results were as follows: 1. Control specimens showed heavy smear layer at the canal walls. 2. Among the groups applied with EDTA for 2 minutes, group 1 showed the heaviest smear layer, and there was statistically significant difference between group 1 and the other groups(p<0.05). 3. Among the groups applied with EDTA for 5 minutes, group 4 and group 6 showed smear layer, but there was no significant difference between them. 4. Among the groups applied with EDTA for the same temperature, group 1 showed heavier smear layer than group 4, and there was statistically significant difference(p<0.05). 5. Among the groups applied with EDTA for the same temperature, group 2 showed heavier smear layer than group 5 and group 3 showed heavier smear layer than group 6. But there was no statistically significant difference among them. From the results above, it could be concluded, EDTA solution is effective in removing of smear layer when it is applied for 5 minutes. If EDTA is applied for 2 minutes, it should be applied above room temperature.

TLD를 이용한 X-선 수중 흡수선량 측정 및 해석

오장진,전재식,하석호,김원식,황선태 대한방사선 방어학회 1988 방사선방어학회지 Vol.13 No.2

LiF : PTEE를 사용하여 중경 X-선(HVL : 0.29, 0.84, 1.60, 2.62mmCu)영역에 대한 수중 흡수선량을 측정 해석하였다. 이때 선량계(0.4mm × Φ12.5mm, hot-pressed LiF TLD-700)는 루사이트로 둘러 싸여 있고 물의 흡수선량은 각각의 TL출력 값에 Burlin의 공동이론을 적용하여 해석하였다. 그 결과 물 팬텀 속 깊이 5㎝에서 흡수선량률의 측정 오차는 최대 ±5%로 나타났다. 이 측정값을 측정 오차가 ±2%의 간접절대측정방법인 이온화법에 의한 측정값과 비교한 결과 두 값의 차이는 LiF : PTFE의 측정오차 범위 내에서 일치하였다. 이와 같은 결과로 LiF : PTFE를 이용한 수중 흡수선량 측정의 신뢰성을 확인할 수 있게 되었으며 이는 중경 X-선 영역에 대한 선량당량 평가의 근거로 활용 될 수 있을 것이다. Absorbed dose in water was analyzed by Burlin's general cavity theory for medium X-ray energy region (HVL : 0.29, 0.84, 1.60, 2.62mm Cu) using LiF : PTFE TL dosimeter(0.4mm x Φ 12.5mm, hot-pressed LiF TLD-700) which was enclosed in Lucite capsule. The absorbed dose rate at 5㎝ depth in water phantom was determined with measurement error of ±5%. This result was compared to that of the ionization method, indirectly absolute measurement method, of which measurement error of ±2%. The difference between these two results lies within measurement error of LiF : PTFE method. Therefore, the absorbed dose in water obtained by LiF : PTFE is reliable, and this result suggests the base to estimate dose-equivalent for medium X-rays.

KAL기 추락에 의한 대량재해의 개인식별

강신몽,이원태,고영창,최상규,김윤희,이홍석,서재관,윤중진,이혜경,최득린,김종열,윤창육,변명식,이장홍 大韓法醫學會 1991 대한법의학회지 Vol.15 No.2

Individual identification is an important part in medicolegal field especially in mass disaster. At July, 27, 1989, KAL KE-803 was crashed on landing at Tripoli International Airport, Liba. The plane was caught in fire and sixty eight Koreans were sacrified. The majority of victims were severely charred and injured. The authors examed all dead bodies and successfully identified all the cases through visual, anthropological, odontological, radiological and pathological methods including fingerprint and blood typing.

House Dust Mite Increases pro-Th2 Cytokines IL-25 and IL-33 via the Activation of TLR1/6 Signaling

Jang, Yong Hyun,Choi, Jin Kyeong,Jin, Meiling,Choi, Young-Ae,Ryoo, Zae Young,Lee, Hyun-Shik,Park, Pil-Hoon,Kim, Sun-Uk,Kwon, Taeg Kyu,Jang, Myoung Ho,Im, Sin-Hyeog,Moon, Sun Young,Lee, Weon Ju,Lee, Se Williams & Wilkins 2017 The Journal of investigative dermatology Vol.137 No.11