• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.190-190
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• 2011

In South Korea the gross generation and heated effluent of power generation plant was 259 TWh and 4.73 billion tons in 2008. And then the waste heat from power generation was 388 TWh. It shows that the efficiency of thermal power generation plant is about 40%. Therefore to reduce $CO_2$ emission from thermal power generation plant, the energy of this heated effluent must be reused to heat buildings or farm facilities. In South Korea horticultural facilities of about 25% are heated in winter season. Total area of greenhouses which are heated is about 13,000 ha. Total heat amount needed to warm greenhouse of 13,000 ha in winter season is only 3.4% of total waste heat from power generation plant. In this study a heat pump system was designed to reuse the waste heat from power generation. Especially new heat exchanger was developed to recover the thermal energy from waste water and this model considered anti-corrosion against sea water and low cost for economic feasibility. This heat recovery system was installed in mango growing greenhouse around thermal power generation plant in Seogwipo-city, Jeju Special Self-Governing Province. The result of preliminary test shows that the heating cost of about 90% is saved as compared to boiler using tax free light oil as a fuel.

• Environmental Analysis Health and Toxicology
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• 제22권4호
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• pp.349-355
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• 2007

장수풍뎅이 유충(Allomyrina dichotoma larva, ADL)은 중국의 전통 약재로서, 특히 항산화 효과가 우수하여 항당료 제재로 사용되고 있다. 본 연구에서는 이러한 ADL의 추출물을 이용하여 헴스터 췌장의 ${\beta}$-세포(HIT-T15)에서 Streptozotocin에 의해 유발된 산화적 손상에 대한 보호효과 및 그 작용기전을 조사하였다. ADL추출물은 처리농도 의존적으로 Streptozotocin에 의해 유발된 지질과산화 및 세포 내 자유산 소종의 양을 억제함으로서 ${\beta}$-세포의 산화적 스트레스에 의한 손상을 보호하였다. 또한 DNA laddering 방법을 사용하여 Streptozotocin에 의해 유발된 DNA 손상을 조사한 결과, ADL추출물 처리농도에 비례하여 Streptozotocin에 의해 유발된 DNA 손상이 감소하였다. 이러한 산화적 손상의 억제능 관련 작용 기전을 조사하기 위해 DPPH free radical 소거능을 실시하였다. 그 결과 ADL추출물 자체가 DPPH 자유 레디컬 소거능이 있음을 확인하였으며, 또한 플라스미드를 이용한 Single-strand break 방법을 통한 DNA 손상 보호능을 측정한 결과도 $Fe^{3+}$ 및 $H_2O_2$에 의해 유발된 DNA 손상이 ADL추출물 처리농도에 비례하여 감소하였다. 이러한 결과들을 종합하여 볼 때, 장수풍뎅이 유충의 추출물들이 자체의 레디컬 소거능 및 산화적 손상에 의한 DNA손상을 억제함으로써, Streptozotocin에 의해 유발된 산화적 손상을 억제할 수 있을 것이라 사료된다.

• Clinical and Experimental Pediatrics
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• 제49권11호
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• pp.1125-1139
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• 2006

In 1991, the Ministry of Health & Social affairs adopted a nationwide service program for neonatal screening of phenylketonuria, galactosemia, maple syrup urine disease, homocystinuria, histidinemia & congenital hypothyroidism for newborns delivered from low class pregnant women registered in health centers. Government decreased the test items from six to two, PKU & congenital hypothyroidism to increase test numbers with same budget from 1995. Government decided to test PKU & hypothyroidism for all newborns from 1997. 78 laboratories wanted to participate for neonatal screening test in 1999. Government didn't decide laboratory center for a certain district and placed responsibility on free competition. Government are planning to test 573,000 newborns from 1998, Government decided to screen 6 items PKU, congenital hypothyroidism, maple syrup urine disese, homocystinuria, galactosemia and congenital adrenal hyperplasia from 2006. 17 laboratores are participating now. The cost of screening test is supported by both the federal government and local government on a 40-60 basis. In case a patient with an inherited metabolic disease is diagnosed by screening of government program, special milk is provided at government's expense. Interlaboratory quality control was started 6 times a year from 1994. According to the government project, 3,707,773 newborns were screened. 86 PKU, 718 congenital hypothyroidism were detected. So incidence of PKU is 1/43,114 and congenital hypothyroidism is 1/4,612. Maeil dairy company produced new special formula for PKU, MMA and PA, MSUD, urea cycle disorder, homocystinuria, isovaleric acidemia from Oct. 1999. The cost benefit of performing screening procedures coupled with treatment has been estimated to be as high as 1.77 times in PKU, 11.11 times in congenital hypothyroidism than cost without screening. We are trying to increase the budget to test all newborns for Tandem mass sereening & Wilson disease from 2008. Now it is a very important problem to decrease laboratory numbers of neonatal screening in Korea. So we are considering 4-5 central laboratories which cover all newborns and are equipped with tandem mass spectrometer & enzyme immunoassay for TSH, 17OHP & enzyme colorimetric assay for galactose.

• 한국항해학회지
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• 제21권1호
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• pp.1-11
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• 1997

Because of the sharp increase of its export and import container cargo volumes contrast to the lack of related Container Terminal facility, equipment and inefficient procedure, there is now heavy container cargo congestions in Pusan Container Terminal. As a result of such a situation, many container ships avoid their calls into Pusan port. This is a major cause that in tum kads to weakening intemational competitiveness of the Korean industry. This study, therefore, aims are to make a quantitative analysis of Container Terminal System through the computer simulation, especially focusing on its 4 sub-system of a handling system, 'it is checked whether the current operation is being performed effectively through the computer simulation. The overall findings are as folIows; Firstly, average tonnage of the ships visiting the BCTOC was 32,360 G/T in from January '96, to may '96. The average arrival interval and service time of container ships at BCTOC are 5.63 hours and 18.67 hours respectively. Ship's arrival and service pattern at BCTOC was exponential distribution with 95% confidence and Erlang-4 distribution with 99% confidence. Secondly, average waiting time and number of ships was 9.9 hours, 235 ships(38%) among 620 ships. Number of stevedoring container per ship was average 747.7 TED, standard deviation 379.1 TEU and normal distribution with 99% confidence. Thirdly, from the fact that the average storage days of containers at BCTOC are 2.75 days (3.0 days when import, 2.5 days when export). it is founds that most containers were transfered to the off-dock storage areas with the free periods(5 days when import, 4 days when export), the reason for which is considered to be the insufficient storage area at BCTOC. Fourthly, in the case of gate in-out at BCTOC, occupied containers and emptied containers are 89% and 11% respectively in the gate-in, 75% and 25% seperately in the gate-out. Finally, from the quantitative analysis results for container terminal at BCTOC, ship's average wating time of ships was found to be 20.77 hours and berth occupancy rate(${\rho}$) was 0.83. 5~6 berths were required in order that the berth occupancy rate(${\rho}$) may be maintained up to 60% degree.

• Asian Pacific Journal of Cancer Prevention
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• 제15권21호
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• pp.9467-9470
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• 2014

Background: Research indicates that oxidative stress induced by smoking plays a role in breast cancer. In view of these reports, we aimed to study th relationship between smoking and oxidative stress in breast cancer patients from the western region of Nepal. Materials and Methods: The study included a control group of 42 females (non-smoking healthy women) and a test group sudivided into Group I consisting of 46 female breast cancer patients who were smokers and Group II consisting of 42 non-smoking breast cancer patients. Detailed history of the patients was collected with the help of pre-test proforma. Plasma levels of malondialdehyde (MDA), total antioxidant activity (TAA) which represents total dietary antioxidants, vitamin C and ${\alpha}$- tocopherol were estimated by standard methods. Statistical analysis was done using SPSS version 16. Results: The plasma MDA, TAA, vitamin C and ${\alpha}$- tocopherol were $1{\pm}1.4nmol/ml$, $918{\pm}207{\mu}mol/L$, $1{\pm}0.24mg/dL$ and $0.94{\pm}0.31mg/dL$ in controls, $5{\pm}1.2nmol/ml$, $458{\pm}166{\mu}mol/L$, $0.64{\pm}0.32mg/dL$ and $0.5{\pm}0.3mg/dL$ in Group-I and $2.56{\pm}1.2nmol/ml$, $663{\pm}178{\mu}mol/L$, $0.78{\pm}0.2mg/dL$ and $0.77{\pm}0.2mg/dL$ in Group- II, respectively. Vitamin C, ${\alpha}$- tocopherol and TAA (p=0.001) were significantly reduced whereas MDA (p=0.001) was significantly raised in Group-I when compared to controls and Group-II. Conclusions: We observed a significant rise in oxidative stress and low levels of antioxidants in breast cancer patients with smoking habit. It is well known that free radicals facilitate the progression of breast cancer, possibly increasing the risk of progression to the next stage.

• 한국과학교육학회지
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• 제15권1호
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• pp.6-16
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• 1995

The purpose of this study is to investigate elementary school 6th grade children's preconception on body's digestion, circulation, breathing and excretion. By means of questionnaire, teacher is presented with misconception which students may have. On the basis of this way, firstly they draw up and put in free-concepts were investigated from objective test and sought after misconeption which student had and inquired whether the result of response made difference by sex and areas or not The result of study is as follows: 1. In the course of investigating and analyzing mis-preconecptios, teacher had misconceptions partially, as like students. 2. Many a student have misconceptions: nourishment in made for itself in body. 3. In circulation range most of students know that heart is making blood, and they don't make conception that blood is nourishment which was eaten from food. 4. They know the breath is only physiological function: they breathe to live. All air-breathing is necessary. 5. They are not relevant blood in course of urine and sweat formation they have non-scientific conceptions which water eaten is so. They know that all of sweat and urine and ordure is excretion. To sum up, many student have misconceptions as for digestion and circulation and breath and excretion of body especially. Circulation and excretion is more so. if inspection in a field of sex, they will know male had less misconceptions than female. in a field of region, student from rural are as had more misconceptions than the one from urban areas.

• 구강회복응용과학지
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• 제19권2호
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• pp.69-74
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• 2003

The purpose of this study was to obtain the color change information for natural tooth of all age groups. Fifty Korean subjects(25 men and 25 women) were randomly selected for this study. They were ranged in age from 24 to 67 years old and were classified into 5 age groups for each sex: 20 to 29, 30 to 39, 40 to 49, 50 to 59, 60 to 69 years. Maxillary central incisor of each subject free from obvious discoloration and restorations on the sites to be measured was selected. Three sites on the labial surface, incisal, middle, cervical area were measured and a circular area of 1.0mm in diameter was measured at each site by the spectrophotometer. The obtained results of this study were as follows: 1) Natural tooth color showed a significant decrease in linghtness($L^*$) at the cervical site(P<0.05). 2) Red/green chromaticity($a^*$) showed a significant increase at all sites(P<0.01). But it was not enough to have a statistic significance among three sites by aging. 3) Yellow/blue chromaticity($b^*$) showed an increase at all sites(P<0.05). But it didn't change significantly among three sites by aging.

• Asian-Australasian Journal of Animal Sciences
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• 제15권1호
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• pp.55-60
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• 2002

A metabolism trial with four castrated male Brahman cattle, average body weight 320 kg, was conducted in order to determine the nutritive value of chopped sugarcane stalk (CSS) for the establishment of feeding strategy in the dry season in Northeast Thailand. Animals were subjected to the following four dietary treatments: Treatment 1; 100% of CSS, Treatment 2; 70% of CSS and 30% of commercial complete feed (TMR), Treatment 3; 40% of CSS and 60% of TMR, and Treatment 4; 100% of TMR. The average CP, ether extracts, nitrogen free extracts, crude fiber and ash contents of CSS were 2.0, 0.9, 79.0, 16.1 and 2.2%, respectively. Although the amount of feed given was approximately at maintenance level, animals in treatments 1 and 2 refused a part of feed. The metabolism trial revealed that total digestible nutrient and metabolizable energy contents of CSS were 61.5% and 9.04 MJ/kgDM, respectively, when it was properly supplemented with protein sources. Nutritive value of CSS was lowered when animals were given CSS solely. This was due to the large loss of energy into urine and methane. Voluntary intake of CSS in cattle was not enough to satisfy energy requirement for maintenance. The CSS can be used as a roughage for feeding cattle in the dry season with proper supplementation of protein and energy.

• Journal of Welding and Joining
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• 제29권1호
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• pp.99-106
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• 2011

Joint strength between a solder ball and a pad on a substrate is one of the major factors which have effects on electronic device reliability. The effort to improve solder joint strength via surface cleaning, heat treatment and solder composition change have been in progress. This paper will discuss the method of solder ball joint strength improvement using LF hydrogen radical cleaning treatment and focus on the effects of surface treatment condition on the solder ball shear strength and interfacial reactions. In the joint without radical cleaning, voids were observed at the interface. However, the specimens cleaned by hydrogen-radical didn't have voids at the interface regardless of cleaning time. The shear strength between the solder ball and the pad was increased over 120%(about 800gf) when compared to that without the radical treatment (680gf) under the same reflow condition. Especially, at the specimen treated for 5minutes, ball shear strength was considerably increased over 150%(1150gf). Through the observation of fracture surface and cross-section microstructure, the increase of joint strength resulted from the change of fracture mode, that is, from the solder ball fracture to IMC/Ni(P) interfacial fracture. The other cases like radical treated specimen for 1, 3, 7, 9min. showed IMC/solder interfacial fracture rather than fracture in the solder ball.

• 대한가정학회지
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• 제40권5호
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• pp.195-210
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• 2002

The purpose of this study were to find out the difference of needs of caring between care-givers and non care-givers, and to suggest the way of lessening vigorous task of care-givers for the elderly with dementia. Data were collected from 130 nationwide respondents intentionally divided into two groups; care-givers and non care-givers in the middle aged with middle and upper income. Collected data were analyzed by frequency, percentage, t-test using SPSS package. Since the result of survey, unexpectedly, showed no difference between two groups, it could be explained as that these two groups commonly had same needs of caring for the elderly with dementia. Major findings were as follow; 1) Most Koreans stiff thought family should be the main care-giver for the elderly with dementia prior to nation or society. 2) Responsibility of caring for the elderly with dementia would be better to be shared with children instead of focusing to a child. 3) They thought ideal residential facilities for the elderly with dementia were small-scale professional dementia facility(group home) rather than home or general elderly housing. 4) Professional dementia care hospital was one of the most needed facilities for the elderly with dementia, followed by short-stay and dar-care center. 5) It was revealed care-giving task was vigorous showing that most care-givers spent 1-5 hours a day for caring, while 13% of respondents spent 11-24 hours a duty. 6) 90% of care-givers took the responsibility of main care-giver because of duty of offsprings or spouses, and wanted to be free from their current circumstances. From the result of this survey researchers would like to suggest the establishment of diverse facilities for professional dementia care to lessen the caring burden for the elderly with dementia: group home, chronic hospital, short-stay, day-care center. Financial support from the government for the housing renovation of the caring families should be considered seriously afterward. It is needed to give the opportunity to select proper paid dementia care facilities according to their income and situation of household.