한국의 초등교사의 과학수업에서의 실험에 대한 인식 및 적용

김동욱, Takuya Matsuura 대구교육대학교 과학교육연구소 2008 과학·수학교육연구 Vol.33 No.-

α-Amino Acid Pendant Polymers as Endosomal pH-Responsive Gene Carriers

Takuya Wada,Atsushi Maruyama,Arihiro Kano,Naohiko Shimada 한국고분자학회 2012 Macromolecular Research Vol.20 No.3

In order to prepare gene carriers responsive to an endosomal pH, amino groups of linear poly(allylamine)(PAA) or poly(L-lysine) (PLL) were coupled with a-carboxyl groups of α-amino acids (Gly, His, Lys, Arg, and Orn). Acid-base titration indicated that Lys-, Arg-, and Orn-pendant polymers had both strongly basic groups and endosomal pH-responsive α-amino groups. These polymers, like PAA and PLL, formed stable complexes with DNA. Lys-,Arg-, and Orn-pendant polymers were effective transfection reagents independent of the backbone polymers. The pH-responsive α-amino groups enhanced transfection activity as shown by the observation that acetylation of the α-amino group resulted in a considerable loss in transfection activity. These results strongly suggested a lysosomotropic activity of the α-amino groups. Among the α-amino acid-pendant polymers tested, the Orn-pendant polymer exhibited the highest transfection activity/toxicity index. Since PLL with α-amino acid-pendants is composed of naturally occurring amino acids, it is expected to be biodegradable, and these reagents have promise as gene carriers.

Magnetic Properties of a Nd7Pd3 Single Crystal

Takuya Matsushita,Koji Shimomura,Takanori Tsutaoka 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3

Magnetization, magnetic susceptibility and electrical resistivity measurements have been carriedout for Nd7Pd3 single crystals having the Fe7Th3-type hexagonal structure with the space groupP63mc. Nd7Pd3 possesses an antiferromagnetic (AF) state at temperatures below TN = 39 K and aferromagnetic or ferrimagnetic one at temperatures below TC = 34 K. Another magnetic transitionor a magnetic structure change was found at Tt = 15.7 K. In the ferromagnetic state, Nd7Pd3 hasa relatively large magnetic anisotropy; the easy magnetization direction is the a-axis, and hard oneis the c-axis. Metamagnetic transitions were observed in the AF state along the c-axis and in thec-plane; the critical field HC increases with increasing temperature. The magnetization curve hasan inflection point even in the paramagnetic state at 45 K in the c-plane, indicating a field-inducedtransition in the region having antiferromagnetic short-range order.

Battery Remaining Charge Estimation for Small Hydroponic Plant Cultivation System

Takuya MOTOSUGI,Satoru YAMAGUCHI,Yoshihiko TAKAHASHI 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10

Continuing population growth and climate shift worldwide has introduced additional risks to our civilization. Our team set out to confront the risk of potential malnutrition of future generations. We have developed a system that utilizes sustainable energy for the purpose of agriculture. Our system utilizes sunlight radiation for energy storing based on a model that incorporates governmental irradiation forecast data. This energy is then used to supplement plant growth. Energy conservation and storage is assisted by an on-site battery that utilizes a method of conservation estimate to accommodate the ever-changing weather conditions which allows for powering the LED light units for plant irradiation. This paper talks about the determination method of a battery SOC (State of Charge) and the simplification of the process based on experiments conducted with a Nickel-Hydrogen battery unit.

Effect of Phosphoric Acid Spray on the Change of Pressure Drop and Physical Property of Fly Ash at Fabric Filter of Incinerator

( Takuya Hosokawa ),( In-hee Hwang ),( Shigetoshi Takahashi ),( Takayuki Matsuo ),( Toshihiko Matsuto ),( Masaaki Kurata ),( Norio Maeda ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2016 No.-

Fabric filter is a representative dust collection device for flue gas treatment in solid waste incinerator. Particulate matter in flue gas is collected on the outside of fabric bags and is periodically dislodged by a pulse of compressed air. Built-up dust layer on the fabric can be a medium to remove smaller size particle but it brings about an increase of pressure loss in fabric filter. In general, the pressure loss caused by dust layer on fabric filter is known to occupy more than half of total pressure loss for the operation of incineration system. The increase of pressure loss leads to the increase of electric consumption of induced draft fan (IDF) to keep a negative pressure in the incinerator. Thus, the control of pressure loss of fabric filter is important to operate incinerate on system. Under this circumstance, one incineration facility reported that pressure loss of fabric filter became lower when wastewater including phosphoric acid was sprayed to furnace for incineration. Phosphoric acid in wastewater was considered to influence the decrease of pressure drop in bag house. In this work, a laboratory scale of experimental apparatus simulating a fabric filter was prepared to reveal the effect of phosphoric acid spray on pressure drop of fabric filter and physico-chemical property of fly ash as well. 7.5 g of fly ash was supplied to the filter by a micro-feeder. Phosphoric acid solution was sprayed by adjusting that the weight ratio of phosphorus became 0~10wt% of fly ash. Variation of pressure drop at the filter, arithmetic average roughness of ash layer on the filter cloth, and particle size distribution and circularity of fly ash were measured under the experiments of spraying different concentration of phosphoric acid solution to the filter cloth. In addition, the form of phosphorus compound in fly ash was analyzed using X-ray diffractometer (XRD, Rigaku Co., Ltd). XRD peaks were identified by Match!2 of software for diffraction peak analysis. As the results, it was found that the increase of pressure drop per unit weight of ash was suppressed when phosphoric acid was sprayed by 2~3wt% as the weight ratio of phosphorus to fly ash. Particle size of fly ash was increased by spraying phosphoric acid. On the other hand, there were no significant changes on arithmetic average roughness at the surface of ash layer and circularity of fly ash with or without spraying phosphoric acid. Calcium hydroxide and calcium hydroxide chloride decreased in fly ash whereas dibasic calcium phosphate was produced in fly ash by spraying phosphoric acid. It indicates that phosphoric acid might consume calcium hydroxide as well as reaction products of calcium hydroxide and hydrogen chloride in fly ash. Thus, the excessive amount of phosphoric acid spray will have a bed influence on flue gas treatment. Considering the effect of pressure loss decrease in fabric filter, the influence on flue gas treatment, and operating cost, phosphoric acid should be sprayed by 2~3wt% as the weight ratio of phosphorus to fly ash.

The generalized Cucconi test statistic for the two-sample problem

Takuya Nishino,Hidetoshi Murakami 한국통계학회 2019 Journal of the Korean Statistical Society Vol.48 No.4

When testing hypotheses in two-sample problem, the Lepage test statistic is often used to jointly test the location and scale parameters, and this test statistic has been discussed by many authors over the years. Since two-sample nonparametric testing plays an important role in biometry, the Cucconi test statistic is generalized to the location, scale, and location–scale parameters in two-sample problem. The limiting distribution of the suggested test statistic is derived under the hypotheses. Deriving the exact critical value of the test statistic is difficult when the sample sizes are increased. A gamma approximation is used to evaluate the upper tail probability for the proposed test statistic given finite sample sizes. The asymptotic efficiencies of the proposed test statistic are determined for various distributions. The consistency of the original Cucconi test statistic is shown on the specific cases. Finally, the original Cucconi statistic is discussed in the theory of ties.

Electrical properties of polycrystalline silicon films formed from amorphous silicon films by flash lamp annealing

Takuya Nishikawa,Keisuke Ohdaira,Hideki Matsumura 한국물리학회 2011 Current Applied Physics Vol.11 No.3

The electrical properties of polycrystalline silicon (poly-Si) films formed from amorphous silicon (a-Si)films by flash lamp annealing (FLA) are investigated by Hall effect measurement. The impurity-doping concentration dependences of resistivity, carrier density, and Hall mobility of such flash-lamp-crystallized (FLC) poly-Si films show the effect of carrier trapping at grain boundaries (GBs). Potential barrier height formed at GBs, estimated from the temperature dependences of Hall mobility and electrical conductivity, decreases with an increase in doping concentration, due to the complete filling of trapping states at GBs. The density of trapping states at GBs is estimated to be on the order of 10^12 cm^-2 from such barrier heights, which is almost equivalent to those of poly-Si films prepared by other techniques such as solid-phase crystallization or laser annealing of a-Si films.

[Oral Session 6] X-RAY PHOTOELECTRON SPECTOSCOPIC ANALYSIS OF ALUMINUM COMPOUNDS ADSORBED ON PULP FIBER SURFACES

Takuya Kitaoka,Hiroo Tanaka 한국펄프·종이공학회 1999 한국펄프종이학회 기타 간행물 Vol.- No.-

Aluminum sulfate (alum) as a representative retention aid in papermaking processes was added to pulp suspensions, and the aluminum components adsorbed on the pulp were investigated quantitatively by two types of X-ray elementary analyses with regard to simultaneous changes of their surface charges. X­ray photoelectron spectroscopy (XPS) and X-ray fluorescence analysis (XFA) were applied to determine the aluminum components retained in pulp pads up to ca. 10 nm and 100 11m depth, respectively. In other words, XPS was utilized to analyze the outermost surface layers of the samples, and XFA was available for measurement of their extensive regions. A particle charge detector (PCD) was used to monitor streaming potentials at various pHs of the pulp mixtures under moderate sharing conditions. At pH 4.5 of pulp suspensions containing alum, surface charges of pulp fibers varied from negative to slight negative (approximately neutral) according to adsorption of aluminum components onto the pulp fibers. Subsequently, when a dilute NaOH solution in limited amounts was added to pulp mixtures. both streaming potentials and surface aluminum content of the pulp fibers increased distinctly although little total aluminum retention increased. Further addition of alkali solutions brought drastic decreases of the surface charges and surface aluminum content, while total aluminum content, on the contrary. increased gradually under neutral conditions.<br/> These results indicate that residual aluminum ions remained in pulp suspensions are predominantly adsorbed on surfaces of pulp fibers by adequate alkali additions, and they must sufficiently cationize the fiber surfaces with increases of somewhat cationic aluminum complexes formed on the surfaces. On the other hand, aluminum components formed in higher pH ranges have nearly no contribution to improvement of charge properties of the pulp fiber surfaces, even though aluminum retention in pulp pads increases. XPS and XFA analyses combined with streaming potential measurement using a PCD suggest close relationships between aluminum content on the pulp fiber surfaces and their charge properties.

Altai Kazakh falconry as ‘heritage tourism’: the Golden Eagle Festivals of Western Mongolia

Takuya Soma (相馬 拓也),Battulga Sukhee (Сүхээ Баттулга) 국립민속박물관 2014 International Journal of Intangible Heritage Vol.9 No.-

Falconry (or hawking), a centuries-old method of hunting,survives in the Altaic Kazakh pastoralist community inBayan Ulgii (Баян Өлгий/Bayan Ölgii) Aimag (Province) , inWestern Mongolia. The hunters specialise in hunting foxeswith female golden eagles. Over the last decade, the spreadof heritage tourism has brought about positive and negativechanges in the tradition. It has also changed the attitude oflocal eagle hunters towards people and especially towardstourists. Since 2000, the establishment of the Golden EagleFestival (Бүргэдийн наадам/ бүркіт той) has changedfalconry from a way of hunting into something that providesdemonstrations and entertainment for tourists. This research reports on the ambivalent situation of theAltaic Kazakh eagle hunters with (1) a survey of theattitudes of local eagle hunters in the Altai, Sagsai, Tolboand Ulaanhus Sum (Counties), (2) interviews with theauthorities concerned, and (3) ethnographic documentationbased on participant observation. The research describes the role of the Golden Eagle Festival which has become the force for major changes inthe tradition of hunting with eagles. New eagle owners arecoming on the scene while at the same time traditionalhunting activities are almost disappearing. It seems thatsome eagle hunters now hold eagles without having anyknowledge about taming and hunting. The local falconryculture is more complex than ever before and the huntershave various views of the situation. Finally, to focus on this cultural transition from ‘livingtradition’ to ‘post-contextual culture’, this study sets out toidentify criteria and create a master plan for the culturalsustainability of Altaic Kazakh falconry in order to conserveit as ‘on-going’ intangible cultural heritage.

Users` Evaluation of Overlapped Auditory Information Given at Railroad Station Platforms

Takuya Hamaguchi,이영창(Young Chang Lee) 한국디자인문화학회 2003 한국디자인문화학회지 Vol.9 No.3