A Compact Magnetohydrodynamic System with Strong Fluid-Magnetic Field Interaction

Naoyuki Kayukawa,Yoshiaki Aoki,Shun ichi Oikawa,Shigeo Yatsu 대한기계학회 1988 KSME/JSME THERMAL and FLUID Engineering Conference Vol.2 No.1

Three Dimensional Magnetohydrodynamic Effects in a Small Scale High Interaction MHD Channel with a Shaped B-Field Configuration

Shun ichi Oikawa,Shigeo Yatsu,Yoshiaki Aoki,Naoyuki Kayukawa,HastusoYamazaki 대한기계학회 1988 KSME/JSME THERMAL and FLUID Engineering Conference Vol.2 No.1

고덕원 국보 동조아미타여래좌상의 표면에 생성한 부식생성물의 해석

송전사랑,청목번부,강대일,Matsuda Shiro,Aoki Shigeo,Kang, Dai-il 국립문화재연구소 1996 保存科學硏究 Vol.17 No.-

최근 환경 오염의 영향으로 문화재가 급속히 손상되고 있다. 이에 일본 동경국립문화재연구소에서는 1992년부터 일본 겸창시의 고덕원, 귀원원, 학강팔번궁, 도근현의 일어기신사, 내량시의 동대사 등에 환경 오염 관측 스테이션을 설치하여 조사하고 있다. 본고는 1996년 3월 일본 동경국립문화재연구소에서 발행된 보존과학 제35호에 실린 송전사랑, 청목번부씨의 “고덕원 국보 동조아미타여래좌상의 표면에 생성한 부식생성물의 해석”논문을 저자의 호의에 의해 번역하였다. In natural atmosphere, copper and copper alloy have been used to make buddha statues and ornaments of historic buildings since the abovementioned metals have corrosion resistance in some extent, and the patinaformed on the surface of the metals has provided the people aesthetic satisfaction with its beauty. But in atmosphere polluted by $SO_x$and $NO_x$, the patina layer does not work as a protective film, and it allows damages of the metal. Since 1992, Tokyo National Research Institute of Cultural Properties(TNRICP)has conducted studies on the influence of atmospheric pollution on metal cultural property held under open air. The Great Buddha Image which is located in Kamakura about 50km west from Tokyo, has been selected as one of the objects to study because it is made by copper alloy and it has stood exposed in the air for about a few hundreds years. Furthermore it is also the reason to study on it that there are many cultural properties in the surroundings of it. We have analysed the components and the structure of the corrosion products formed on the surface of the Buddha, have carried out exposure tests using the alloy samples which have simulated the components of the Great Image, and have observed climated and polluted air in order to discuss the relation between corrosion of metals in open air and conditions of the atmosphere. In this paper, the authors have described the components and the structure of the corrosion product formed on the surface of the Great Image by means of X-ray fluorescence spectroscopy and X-ray diffraction. The conclusions are as follows. (1) Sulfate patina composed mainly with brochantite were detected on the all sides of the Image and the amount of the patina is found more on the back of the Image facing to north. (2) Antlerite were detected on the back and a park of the left side facing to west, and formation of it was considered to have close relation with malignant atmosphere. (3) A big amount of chloride patina which mainly composed of atacamite were observed on the front facing to south. (4) Carbonate patina mainly composed of malachite were detected on the area where brochantite was often detected as well. It suggested that malachite had been transformed into brochantite by deteriorated atmosphere. (5) On the all sides of the Image, patina were observed together with copper oxides mainly composed of cuprous oxide. It showed that the surface layer of the Image consists of two layers : inner layer of oxide and outer layer of patina. (6) Corrosion products of lead which was a component of copperalloy were detected on the all sides : the main lead product found on the front was chlorophosphate whereas the one on the back was sulfate.

중앙아시아벽화 보존처리(2) : 벽화의 채색 안료 및 벽체 조성에 사용된 초재류 조사

이용희,유혜선,김수철,강형태,조연태,시게오 아오키,켄타로 오바야시 국립중앙박물관 2003 박물관보존과학 Vol.4 No.-

용산 새 박물관에 전시될 중앙아시아 벽화의 보존처리를 위해 이들 벽화의 채색안료 성분분석과 벽체에 포함된 지푸라기의 식물종 식별을 위한 조사를 실시하였다. 또한 1916년 우리 박물관에 반입되기 이전에 일본에서 시행된 보존처리 재료 및 방법을 검토하기 위하여 나무 보호틀의 목재수종 및 종이의 재질을 분석하였다. 조사결과 본4075, 4078의 검은색 안료는 carbon(C), 바탕의 흰색은 gypsum[Ca(SO₄)(H₂O)₂], 적색 계통은 lead oxide(Pb₃O₄, PbO)와 hematite(Fe₂O₃), 녹색은 Cu, As, O 화합물 등을 채색 안료로 사용하였다. 또한 벽체를 조성할 때 흙벽이 갈라지는 것을 방지하기 위해 섞어 넣은 지푸라기는 밀짚 또는 귀리짚 종류인 것으로 조사되었다. 또한 현재 벽화를 둘러싸고 있는 나무 보호틀은 버드나무속, 사시나무속, 삼나무, 그리고 소나무 중 적송류로 만들어진 것으로 밝혀졌으며 벽화(본4054, 4097)의 보호를 내부에서 발견된 종이는 뽕나무 껍질로 만든 것으로 조사되었다. For the conservation treatment of the Central Asia mural painting which is to be exhibited in the new museum in Yongsan, we analyzed the pigments used in this mural painting and examined to identify the species of the straw in the wall. We also analyzed the species of the wood of the wooden protective frame and the material of the paper in it, in order to review the material and technique of the conservation treatment performed before the mural painting had been brought to the National Museum of Korea in 1916. The results were as follows: the black pigments of Bon4075 and Bon4078 is carbon(C); the white pigment on the background is gypsum[Ca(SO₄)(H₂O)₂]; the red pigment is lead oxide(Pb₃O₄) and hematite(Fe₂O₃) etc. The straw, which had been mixed into the wall to prevent the wall from cracking, was proved to be either wheat straw or oats straw. The wooden protective frame, which protects the mural painting now, was proved to be made of Salix, Populus, Cryptomeria japonica and pine. The paper discovered in the frame was proved to be made of the bark of a mulberry.

中央 亞細亞 壁畵 保存處理(Ⅰ) - 壁畵(本4074, 本4096)의 狀態調査 -

姜炯台(Hyungtae Kang),李容喜(Yonghee Yi),兪惠仙(Heisun Yu),金硏美(Yeon-mi Kim),趙娟兌(Yeontae Jo),靑木繁夫(Shigeo Aoki),山本記子(Noriko Yamamoto),大林賢太郞(Kentaro Ohbayashi) 국립중앙박물관 2002 박물관보존과학 Vol.3 No.-

경천사10층석탑 오염물 제거 방안 연구-레이저를 이용한 오염물의 제거 방안 중심으로

김진형,김사덕,강대일,청목번부,Kim, Jin-Hyung,Kim, Sa-Dug,Kang, Dai-Ill,Aoki Shigeo 국립문화재연구소 2002 保存科學硏究 Vol.23 No.-

It has been proved that pollutants stuck on the surface of stone architecture have significant direct and indirect harmful effects on them. Among them some do not look evidently harmful, but they have potentials to ruin stone architecture as time goes on. Since the cultural assets have magnificent meanings as historical aspects, their future states should be considered seriously as well as that of the presence. The past method to get rid of the pollutants from the surface of cultural properties has been changed a lot till the present along with scientific development of technology on this field. Existing method to eliminating pollutants are based on physical and chemical processing, which can make damages on them too. Recently cleansing using LASER has been developed in Europe and proved as effective and relatively less harmful to remove pollutants, and it has been adopted widely. After the success of the way by LASER, there are several trials to adopt the way to our cultural properties which have similar materials. Those showed satisfactory results and studies for developing the securer and more dependable ways to apply. From now on the report will show the effective ways to apply the method using LASER on to the similar materials and different materials as well and discuss about the pros and cons about the method.

Association between Osteoporosis and Skeletal Muscle Mass in Men

Mizutani Masaya,Eguchi Yawara,Toyoguchi Toru,Orita Sumihisa,Inage Kazuhide,Shiga Yasuhiro,Maki Satoshi,Nakamura Junichi,Hagiwara Shigeo,Aoki Yasuchika,Inoue Masahiro,Koda Masao,Takahashi Hiroshi,Akaza 대한척추외과학회 2024 Asian Spine Journal Vol.18 No.1

Study Design: Cross-sectional study.Purpose: This cross-sectional study aimed to investigate the risk factors for osteoporosis in men by assessing bone mineral density (BMD), skeletal muscle mass, body fat mass, grip strength, and advanced glycation end products (AGEs).Overview of Literature: Fewer studies have reported the correlation between BMD and skeletal muscle mass in women. Moreover, a few studies have examined the relationship between osteoporosis and skeletal muscle mass.Methods: This study included 99 men (mean age, 74.9 years; range, 28–93 years) who visited Qiball Clinic for BMD and body composition examinations. The osteoporosis group consisted of 24 patients (mean age, 72.5 years; range, 44–92 years), and the control group consisted of 75 individuals (mean age, 74.9 years; range, 28–93 years). Whole-body skeletal muscle mass was measured using a bioelectrical impedance analyzer. BMD was measured by dual X-ray absorptiometry. Skin autofluorescence (SAF), a marker of dermal AGE accumulation, was measured using a spectroscope. Osteoporosis was defined as a bone density T score of –2.5 or less. Physical findings, skeletal muscle mass, BMD, grip strength, and SAF were compared between the osteoporosis and control groups.Results: The osteoporosis group had significantly lower trunk muscle mass (23.1 kg vs. 24.9 kg), lower leg muscle mass (14.4 kg vs. 13.0 kg), and skeletal mass index (7.1 kg/m² vs. 6.7 kg/m²) than the control group (all <i>p</i><0.05). Lower limb muscle mass was identified as a risk factor for osteoporosis in men (odds ratio, 0.64; <i>p</i>=0.03).Conclusions: Conservative treatment of osteoporosis in men will require an effective approach that facilitates the maintenance or strengthening of skeletal muscle mass, including exercise therapy with a focus on lower extremities and nutritional supplementation.