• Asian Journal of Atmospheric Environment
• /
• 제6권4호
• /
• pp.246-258
• /
• 2012

Particulate matter deposited on leaf surfaces may cause erosion/abrasion of epicuticular wax and the malfunction of stomata. However, the deposition processes of particulate matter, such as elemental carbon (EC), has not been studied sufficiently in Asian forest ecosystems. Deposition processes for particulate ${SO_4}^{2-}$ and EC were studied in a Japanese cedar forest in Kajikawa, Niigata Prefecture, Japan, and in a dry evergreen forest and a dry deciduous forest in Sakaerat, Nakhon Ratchasima province, Thailand. The ${SO_4}^{2-}$ fluxes attributed to rainfall outside the forest canopy (RF), throughfall (TF), and stemflow (SF) showed distinct seasonalities at both sites, increasing from November to February at the Kajikawa site and in March/April at the Sakaerat site. Seasonal west/northwest winds in winter may transport sulfur compounds across the Sea of Japan to the Kajikawa site. At the Sakaerat site, pollutants suspended in the air or dry deposits from the dry season might have been washed away by the first precipitations of the wet season. The EC fluxes from RF and TF showed similar variations by season at the Kajikawa site, while the flux from TF was frequently lower than that from RF at the Sakaerat site. Particulate matter strongly adsorbed onto leaf surfaces is not washed away by rainfall and contributes to the EC flux. At the Kajikawa site, Japanese cedar leaf surfaces accumulated the highest levels of particulate matter and could not be neglected when calculating the total flux. When such leaf-surface particles were considered, the contribution of dry deposition to the total EC flux was estimated to be 67%, 77%, and 82% at the Kajikawa site, and at the evergreen and deciduous forests of the Sakaerat site, respectively. Leaf-surface particles must be included when evaluating the dry and total fluxes of particulate matter, in particular for water-insoluble constituents such as EC.

• Asian Journal of Atmospheric Environment
• /
• 제7권4호
• /
• pp.191-198
• /
• 2013

Cryptomeria japonica pollen is the most common pollen, which are scattering during each spring season in Japan. Japanese cedar (Cryptomeria japonica) pollinosis is one of seasonal allergic rhinitis that mainly occurs in Japan. In addition, long range transportation of Yellow Sand from the East Asian continent was also found during the pollen scattering seasons in Japan. Therefore, the interaction or impact between pollen and Yellow Sand should be concerned. In this study, our objective was to investigate the airborne behaviour of Cryptomeria japonica pollen grains and its size-segregated allergenic (Cry j 1) particles as the airborne tracer of Cryptomeria japonica pollen during the Yellow Sand events. Airborne Cryptomeria japonica pollen grains and its size-segregated allergenic particles were collected at roadside of urban residential zones of Saitama city during the pollination periods from February to March in two year investigation of 2009 and 2010. The overlap of Yellow Sand events and dispersal peak of pollen grains was observed. According to the Meteorological data, we found that the peaks of airborne pollen grains appeared under higher wind speed and temperature than the previous day. It was thought that Yellow Sand events and airborne pollen counts were related to wind speed. From the investigation of the airborne behavior of the size-segregated allergen particles by determining Cry j 1 with Surface Plasmon Resonance (SPR), the higher concentrations of the allergenic Cry j 1 were detected in particle size equal to or less than $1.1{\mu}m$($PM_{1.1}$) than other particle sizes during Yellow Sand events, especially in the rainy day. We conclude that rainwater trapping Yellow Sand is one of the important factors that affect the release of allergenic pollen species of Cry j 1. Therefore, it is very important to clarify the relationships between Cryptomeria japonica pollen allergenic species and chemical contents of the Yellow Sand particles in further studies.

• 박물관보존과학
• /
• 제19권
• /
• pp.53-68
• /
• 2018

서화의 장황(粧䌙) 형태 중 족자와 두루마리는 상·하 또는 좌·우 끝에 축목(軸木)과 축두(軸頭)를 장착하여 걸어서 감상하고, 말아서 보관하게 된다. 축목과 축두는 한·중·일 각각 다양한 용어와 재료를 사용하였다. 한국의 축목은 상하축횡목, 축두는 축두로 지칭하며 재료는 소나무, 잣나무, 산유자나무 등이 사용되었다. 중국은 축목을 축간, 축두는 축두라 지칭하며 삼나무, 홍목, 자단 등으로 제작되었다. 일본은 상축을 팔쌍, 팔장, 하축은 축목이라 하고 삼나무, 자단, 수정 등이 사용되었다. 한국의 축두 형태는 끝 단면의 문양에 따라 문양이 없는 무문과 문양이 있는 유문으로 크게 대별된다. 무문은 단면이 평평한 평두와 둥근 둔두로, 유문은 동심원형과 쌍원형, 삼원형으로 나뉜다. 특히 공신도상 3점이 평두의 동심원형으로 장서각에서 소장된 대다수의 교서와 형태가 같다. 그 결과 왕실에서 제작된 공신관련 장황에 사용된 축두가 대부분 평두의 동심원형이 사용되었음이 확인되었다.

• 보존과학회지
• /
• 제38권2호
• /
• pp.133-143
• /
• 2022

본 연구에서는 대구근대역사관 소장 인력거의 재질별 분석을 통해 다양한 재질이 복합적으로 사용되는 근·현대문화재의 재료를 확인하고, 보존 및 관리의 기초 자료를 구축하고자 하였다. 금속, 목재, 섬유, 도료를 대상으로 P-XRF, 수종분석, 섬유동정, 도막층 분석(층상 구조, SEM-EDS, FTIR)을 실시한 결과, 금속은 구리(Cu), 아연(Zn), 황동(Brass)과 철(Fe)로 확인되었다. 목재는 상수리나무류, 삼나무, 대나무아과, 비자나무속이 식별되었으며, 이 중 삼나무는 일본 자생종으로 인력거 제작 당시 일본에서 목재를 수입하여 제작하고, 근대 일본 인력거의 제작 양식에 영향을 받은 것으로 추정되었다. 섬유는 면(Cotton)을 주로 사용하였으며, 일부는 가죽(Leather)도 확인되었다, 도막층은 캐슈(Cashew)를 사용하여 1회 이상 도포한 것으로 관찰되었으며, 특히 인력거 몸체부는 섬유층, 토회층, 도료층, 채색층이 중복되어 관찰되고, 성분이 다른 적색 안료(산화철 및 진사)층이 관찰된 점을 보아, 과거 일부 보수 및 보존처리가 진행된 것으로 판단된다.

• 공업화학
• /
• 제33권4호
• /
• pp.373-380
• /
• 2022

본 연구에서는 화재 시 연기안전 등급 평가를 표준화하기 위해 Chung's equations 1, 2와 3을 확장하여 Chung's equations-V인 연기성능지수-V와 연기성장지수-V를 산정하였다. 5종류의 목재를 선별하여 ISO 5660-1의 규격에 의한 콘칼로리미터(cone calorimeter)법으로 연기지수들을 측정하였다. Chung's equation-VI에 따라 연기위험성지수-VI에 의한 연기위험성을 등급화 하였다. 연기위험성지수-VI는 PMMA(1) ≈ 단풍나무(1.01) < 물푸레나무(1.57) < 전나무(4.98) < 오동나무(46.15) < 적삼목(106.26)의 순서로 증가하였다. 단풍나무, 물푸레나무의 연기위험성이 가장 낮고, 오동나무, 적삼목이 가장 높은 것으로 예측되었다. 시험편 5종의 일산화탄소 평균생성속도는 0.0009~0.0024 g/s으로 나타났으며, 이들 목재는 기준 물질인 polymethyl methacrylate보다 불완전연소 물질임을 나타내었다. 선정된 목재들의 연기특성은 체적밀도가 높을수록 연기성능지수-V (SPI-V)이 증가하였고, 연기위험성지수-VI (SRI-VI)가 감소하였다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제21권7호
• /
• pp.1011-1014
• /
• 2008

A total of 335 sows at a commercial operation (Hitch Pork Producers Inc, Guymon, OK) was used to determine dietary effects of yeast culture supplementation ($XPC^{TM}$, Diamond V Mills) on litter performance. Sows were grouped by parity (parity 1 to 12). Pigs within a group were then allotted to treatments. Treatments consisted of: CON (no added yeast culture) and YC (12 and 15 g/d XPC during gestation and lactation, respectively). Sows were housed individually and fed their assigned gestation and lactation diets from d 35 of gestation to d 21 of lactation. Sows were fed 2.0 kg/d during gestation and ad libitum during lactation. Voluntary feed intake was measured daily during lactation. At farrowing, numbers of pigs born total and alive were measured. Weights of litters were measured at birth and weaning on d 21 of lactation. Litter weight gain of the YC treatment was 6.9% greater (p<0.01) than that of the CON. However, voluntary feed intake of sows and litter size did not differ between treatments. This study indicates that dietary yeast culture supplementation benefits sow productivity by improving litter weight gain. At present, it is not confirmed if improved litter weight gain was due to milk production, which remains to be investigated.

• 한국식물병리학회:학술대회논문집
• /
• 한국식물병리학회 2003년도 정기총회 및 추계학술발표회
• /
• pp.134.1-134
• /
• 2003

Aecial host ranges of four Gymnosporangium species causing cedar-apple rust diseases, G. asiaticum, G. cornutum, 5. japonicum and G. yamadae, were investigated through artificial inoculation. Thirteen species of nine genera among Rosaceous plants, which have been reported as social hosts in Korea, were inoculated with fresh teliospores spores in early days of May of 2000 and of 2001, respectively. In the results, we re-confirmed that there was highly specific relationship between the rust species and aecial hosts and report new aecial hosts of four Gymnosporangium species. Teliospores of G. cornutum collected from Juniperus rigida successively produced spermogonia and aecia only on Sorbus alntifolia, the first report on host alteration of G. cornutum in Korea. Positive responses by teliospores of G. japonicum from J. chinenis of Suwon and from J. chinenis var. horizontalis of Jeju island were obtained only on P. villosa. Crataegus pinnatifida was confirmed as a new aecial host of G. viatium. Until this time, G. ymadae was believed to have Malus as the aecial host. However, teliospores of G. yamadae collected from J. chinensis var. kaizuka successively formed spermogonia and aecia on the leaves of Chaenomeles lagenaria, C. sinensis, Pyrus pyrtifolia var, culta, P. ussuriensis, Malus pumila and M. sileboldii. The date for maturation of spermogonia and aecia, and symptom development varied according to the rust fungi and aecial host plants, respectively.

• 한국임상수의학회지
• /
• 제21권2호
• /
• pp.209-213
• /
• 2004

A 8 kg, 3-year-old male West Highland white terrier dog with a 1.5-year history of chronic, severely pruritic, seborrheic skin disorder was referred to the Veterinary Medical Teaching Hospital of the Tokyo University of Agriculture and Technology. On physical examination, lesions were observed on entire cutaneous surface, except for face, dorsum of body, and footpads. Skin lesions were characterized by diffuse erythema, erythematous papules, severe alopecia, hyperpigmentation, and lichenification. Tape strip tests of skin lesions revealed cocci and Malassezia infections. The intradermal allergy tests revealed positive reactions to Japanese cedar pollen, but the non-seasonal clinical signs were not compatible with atopic dermatitis caused by this pollen. Results of hematological examination, serum chemistry and thyroid gland profile were normal. Examination of skin biopsy exhibited hyperplastic superficial perivascular dermatosis with severe acanthosis, excessive keratinocyte mitoses, patchy or diffuse mild spongiosis, and lymphocytic exocytosis in epidermis. Perivascular to interstitial mononuclear cells infiltration was seen in the superficial dermis. Based on the results of examination described above, epidermal dysplasia was diagnosed. Treatments with administration of antibiotics, etretinate, and prednisolone orally combined with topical ketoconazole cream and antiseborreic shampoos had no good results. Following treatment with long-term oral itraconazole at 10 mg/kg daily and chlorhexidine shampoos was successful. However, when itraconazole therapy was stopped, the condition worsened twice within 2 or 3 months. Readministration of itraconazole produced improvement within 4 weeks. This dog has now been controlled periodical itraconazole therapy.

• Journal of the Korean Wood Science and Technology
• /
• 제44권6호
• /
• pp.809-820
• /
• 2016

The goal of this study was to predict lamina yield from logs of different diameter for production of cross laminated timber. Log characteristics of red pine (Pinus densiflora) and Japanese cedar (Cryptomeria japonica), including diameter, length, volume, and defects were used for statistical and geometrical analyses, along with the lamina characteristics, including width, thickness, and defects. Based on the data obtained, the strong factors influencing the yield and grade of lamina from the two species were statistically evaluated. A geometrical approach was used for analysis of the yield from logs of given diameters. Statistical analysis showed that lamina yield was dependent on target lamina size but the grade of lamina was not related to any of the log characteristics. The suggested yield equations from the geometrical approach indicated an accuracy of less than 20% difference.

• 한국가구학회지
• /
• 제26권3호
• /
• pp.222-228
• /
• 2015

To evaluate the natural decay durability of valuable domestic softwoods which are used for preservative treatment in our country, we carried out decay test by European standard method. Of all test wood species, Japanese larch (Larix leptolepis) showed slightly high natural decay durability compared to other 4 wood species, Japanese red pine (Pinus densiflora), pitch pine (Pinus rigida), Japanese cedar (Cryptomeria japonica), and scots pine (Pinus sylvestris). However, all of evaluated domestic softwood species in this study caused high weight losses over about 30% in heartwood by test fungus, Poria placenta. We can hardly expect a good natural decay durability from these softwood species. According to the classification of the natural durability of European standard (EN 350-1), they are classified into "Not durable" or "Slightly durable". Therefore, if using these softwoods as exterior materials, we must do preservative treatment to ensure durability.