• Korean Journal of Heritage: History & Science
• /
• v.41 no.1
• /
• pp.5-19
• /
• 2008

Thirty six samples of Western asia glass vessel shards which were excavated from South Mound of Hwangnamdaechong were each measured for thickness, pore size and specific gravity and analyzed for ten major compositions and thirteen trace elements. The glass samples with colorless, greenish blue and dark purple blue were well classified by principal component analysis(PCA). All glass shards of Hwangnamdaechong belonged to Soda glass system ($Na_2O-CaO-SiO_2$) which have the range of 14~17% $Na_2O$ and 5~6% CaO. The corelation coefficients of (MgO, $K_2O$) and (MnO, CuO) showed above 0.90. The concentrations of thirteen trace elements apparently differentiated from colorless, greenish blue and dark blue glasses. We found that thirteen trace elements were very important indices for studying raw material of glass and the origin of glass making. Colorless glass : The specific gravity is $1.50{\pm}0.04$. Circle or oval circle pores are observed with regular direction in internal zone and the longest one is about 0.35 mm. The raw material of sodium must be the plant ash because sodium glasses contain HCLA(High CaO, Low $Al_2O_3$) and HMK(high MgO, high $K_2O$) and suggested to Sasanian glass. The total amount of coloring agent of colorless glass is below 1 % which is too small to attribute to the color. Greenish blue glass : The specific gravity is $1.58{\pm}0.04$. The fine pores which are 0.1~0.2mm are dispersed in internal zone. Sodium glasses are distributed to HCLA and HMK. Therefore the greenish blue glass also have used plant ash for raw material of sodium with the same as colorless glass. It was also suggested to the glass of Sasanian. The total amount of coloring agent of greenish blue glass is about 4% under the influence of working MnO, $Fe_2O_3$ and CuO. Dark purple blue glass : The specific gravity is $1.48{\pm}0.19$. There are rarely pores in internal zone. They are distributed to HCLA and LMK(Low MgO, Low $K_2O$) and suggested to Roman glass. The raw material of sodium is estimated to natron. The total amount of coloring agents of greenish blue is about 3% by $Fe_2O_3$ and CuO. These studies for western asia glass shards from South Mound of Hwangnamdaechong could be used in the future as the standard data which could be compared with those of other several graves in Korea and dispersed in foreign areas.

• Corrosion Science and Technology
• /
• v.8 no.2
• /
• pp.53-61
• /
• 2009

In this study, both evaluations by visual imaging for exterior view of coating and by EIS were executed for epoxy primer coated specimens deteriorated by accelerated test, and comparison and analysis were carried out for 2 evaluation methods. In the comparison between total damaged area ratio acquired by image processing method and deterioration point, higher deterioration points were appeared for rusted specimens than for non-rusted specimens. It is attributed that deterioration point per unit area ratio given for rust is higher than for peeling. In the comparison between total damaged area ratio and EIS result, impedance of coating was largely decreased as about TEX>$10^4{\Omega}{\cdot}cm^2$ or less when rust area ratio is more than about 0.1%, and blistering area ratio is more than about 3%. Charge transfer resistance ($R_{ct}$) and double layer capacitance ($C_{dl}$) values were appeared for all specimens except 2 ones, which shows that water is accumulated and steel substrate is corroded at coated film-steel interface. In the comparison between deterioration point and EIS result, more than 10 points as deterioration point were given for specimens of below $10^6{\Omega}{\cdot}cm^2$ of impedance at low frequency. For specimens deteriorated by NORSOK cyclic test, impedance was lowest of all, though deterioration point was not high. It is thought to be attributed that coating system and accelerated deterioration condition of cyclic tested specimens were different from those of main specimens. From the result, it is thought that coating resistance can be relatively more decreased than deterioration degree estimated from exterior view under more severe corrosion environment or in the present of more complex deterioration factors.

• Korean Journal of Environment and Ecology
• /
• v.18 no.4
• /
• pp.359-368
• /
• 2004

The purpose of this study is to examine distribution and damages of the trails of inquiry of urban natural parks. Those parks were located at south-north green corridor at Incheon being mountainous type of urban natural parks that were core area of urban ecosystem preservation to of urban natural parks that citizens recently made use of them as nature experience type of leisure and recreation place from time to time, and to supply basic material deciding on the ways to improve the trails of nature preservation type. The survey sites included Geyang Park, Baekma Park, Yaksa Park, Munhak Park and Cheongryang Park. The number of main trails was 42 at Geyang Park, 43 at Baekma Park, 9 at Yaksa Park, 28 at Munhak Park, and 22 at Cheongryang Park, and it was excessively more than optimum needed: The number of branch trails of the parks seemed to increase. The bared trail width in average of the roads was 3.5m, while maximum depth in average was 21.3cm. The trails were thought to be deteriorated rapidly without systematic maintenance. The 5th and 6th grade of the impact rating class that required restoration because of serious deterioration occupied 19.6∼78.0%. Based on the findings, the study suggested ways to improve and manage the trails of inquiry of urban natural parks that were placed at south-north green corridor at Incheon.

• Geophysics and Geophysical Exploration
• /
• v.8 no.1
• /
• pp.86-91
• /
• 2005

We present the results of electrical resistivity surveys carried out to estimate the seasonal variation of the water table level in a large-scale landslide area of Tertiary geology in Japan. One long profile, trending NE-SW, was established perpendicular to the main regional geology of the region. Three boreholes are located very close to the profile. The profile was surveyed twice, once before snowfall and once after snow had melted. The relationship between resistivity and water saturation of pyroclastic materials was clarified through laboratory tests. We did this in order to estimate the water content of the pyroclastic layer from the observed resistivity distribution in the landslide area. The resistivity of the saturated pyroclastic deposit calculated using an empirical formula was found to be $570{\Omega}.m$. Based on this computed resistivity, the groundwater level was deduced by assuming that the pyroclastic deposits were fully saturated beneath the water table. We show that the estimated water table before snowfall is lower than that inferred after snow has melted, by about 1.1 to 4.7 m. This suggests that the water table in the upper part of the pyroclastic layer in the landslide area fluctuates greatly, compared to the lower part. This seasonal groundwater fluctuation is possibly caused by the infiltration of water into the subsurface after snowmelt.

• Journal of the Korean Institute of Gas
• /
• v.25 no.3
• /
• pp.1-8
• /
• 2021

Among the flare systems that handle discharged substances from safety valves, the knockout drum was a key facility for safety, but the installation standards were not clear, so it was necessary to review the standards acceptable to the workplace and regulatory agencies. After investigating the domestic and foreign technical standards of knockout drums and the deficiencies of previous studies, research was first conducted on the degree of mass discharge, the installation location of the intermediate knockout drum, and the effect of changes in the composition of the discharged material. As a result of the study under the process simulation conditions, the gas-liquid separation of the knockout drum was completed in a small amount of less than 7,500kg/hr. However, when more than that was released, the gas-liquid separation effect was small even with the addition of an intermediate knockout drum. In addition, when the composition ratio of the material easily condensed was increased (molar fraction 10%), the gas-liquid separation effect of the knockout drum increased in the case of mass release. The gas-liquid separation effect was analyzed to be greater when the knockout drum was installed adjacent to the stack than the knockout drum was installed adjacent to the process equipment.

• The Journal of Korean Society of Virology
• /
• v.29 no.2
• /
• pp.55-64
• /
• 1999

In Yugoslavia, hemorrhagic fever with renal syndrome (HFRS) is one of the important national health problem, but no vaccine has been used to prevent HFRS. Since first HFRS case in 1952, sporadic cases of HFRS occurred every year and over 4,000 registered cases with $1{\sim}16%$ mortality so far. We performed a prospective, randomized double-blind placebo-controlled trial to evaluate the effectiveness of $Hantavax^{TM}$ against HFRS in 3,900 healthy adults living in the endemic areas of Yugoslavia. 1,900 people were given 0.5 ml of Hantavax subcutaneously twice at one month interval and a booster shot at one year after. For controls other 2,000 healthy people were given 0.5 ml of physiolosical saline as a placebo. We investigated HFRS cases in both the vaccinated and nonvaccinated groups by monitoring the program for patient registration in the areas from 1996 to 1998, and the effect of vaccine was analyzed epidemiologically. No confirmed case of HFRS was observed among 1,900 Hantavax vaccinees, while 20 confirmed cases were observed among 2,000 nonvaccinated control group. There were no remarkable side effects among the vaccinees either locally or in general after inoculation of the vaccine. The Hantavax vaccine showed statistically significant protective efficacy against HFRS among Yugoslavian people.

• 공원문화
• /
• s.32
• /
• pp.26-31
• /
• 1986

봄비가 촉촉 내린다. 가뭄에 메마른 곳을 적셔주고 먼 산허리에의 희끗희끗 얼어붙은 눈을 녹이고 한 겨울의 탁한 먼지를 말끔히 씻어준다. 온 대지에 푸른 생기가 가득차 움추린 가슴을 풀어 헤지게 하여 싱그러운 봄을 느끼게 한 지난3월22일 국립공원월악산을 찾았다. 월악산은 지난 1984년 12월 27일 국립공원으로 지정되어 산수의 조화등 입지조건으로 충북도민은 물론 인근도민과 전국의 자연공원 애호인 들의 관심사가 되고 있는데 그 면적은 $284.5km^2$에 이른다. 그중 충북 제원군이 $111.30km^2$, 단양 $63.32km^2$, 중원$32.08km^2$ 그리고 경북 문경군이 $77.8km^2$를 점하고 있다.

• 보건세계
• /
• v.61 no.4
• /
• pp.38-40
• /
• 2013

2007년부터 교육감 직선제가 시행됨에 따라, 이제 교육 정책을 펼칠 지역 일꾼을 직접 뽑을 수 있게 됐다. 2010 부산시 교육의 책임자로 시민의 선택을 받은 임혜경 교육감은 지난 해 '전국 교육감 공약 이행 및 정보공개 평가'에서 최고 평가를 받았다. 취임 4년차, 그 행보가 돋보이는 임혜경 교육감을 만나보았다. 인터뷰를 위해 찾은 부산시교육청은 청명한 가을 날씨에 길 양쪽으론 가로수가 멋들어진, 옛날의 교정을 연상케 했다. 그리고 가을 햇살 가득한 방, 교육감실에서 인터뷰가 진행되었다. 다음은 임혜경 교육감과의 일문일답.

• 건강소식
• /
• v.34 no.12
• /
• pp.6-9
• /
• 2010

중세 유럽에서 여러 지방을 떠돌아다니면서 시를 읊었던 시인을 두고 '음유시인'이라고 말한다. 이 음유시인이라는 말이 참 어울리는 가수가 있다. 바로 '존재의 이유', '사랑을 위하여'를 부른 김종환이다. 그의 노래에는 누구나 공감할 수 있는 중독성 강한 '진정성'이 녹아 들어 있다. 그래서 그의 노래 가사가 더욱 가슴에 와 닿는 한 편의 시가 된다. 그런 그가 최근 새로운 노래 '사랑이여 영원히'를 들고, 다시 음유시인이 되어 돌아왔다.

• The Korean Chronic Disease News
• /
• no.321
• /
• pp.1-18
• /
• 2007

도시 보건지소 13개소로 확충/복부비만은 심장의 적/서울시민 10.7% 정신건강 고위험군/질병 '유전자 치료' 가능성 열어/당뇨병 환자 자신감이 최고의 치료/저염섭취로 만성질환 발병률 감소/소아비만 부모 역할 매우 중요/100세 장수노인 인구 급증/존경받는 회사로 '100년 녹십자' 제시/폐암수술 5년 후 생존율 55% 수준/전립선암 조기 발견이 치료비 4배 절감/노인들 아플 때 '자식' 가장 보고 싶다/건강 도시! 행복 도시! 전국 최고 친절한 보건소!/공부해서 하는 사업은 격이 다르다/의약품 허가심사업무 "혁신"/당뇨병 희로애락을 보여주세요/건강투자전략의 이해/만성질환관리의 정책적 추진 방향/