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Development status of WINDS (Wideband InterNetworking engineering test and Demonstration Satellite)
Arikawa, Yoshihisa,Kuramasu, Ryoichi,Nakamura, Yasuo,Araki, Tsunehiko,Shimada, Masaaki 통신위성우주산업연구회 2003 Joint Conference on Satellite Communications Vol.2003 No.-
The Wideband Inter Networking engineering test and Demonstration Satellite (WINDS) aims t developing and verifying the key technologies for future ultra high speed satellite communications such as: (1) Ka-band multi-beam antenna with high power multi-port amplifier; (2) Ka-band active phased array antenna; and (3) an on-board Asynchronous Transfer Mode switch. It also aims to create and demonstrate new utilizations for satellite communications through various experiments. The development of WINDS has been conducted by NASDA and the Communications Research Laboratory (CRL) and WINDS is scheduled to be launched by H-IIA launch vehicle in 2005 (first year). In this paper, the current development status of WINDS system is reported.
Koji Arikawa 서울대학교 인지과학연구소 2020 Journal of Cognitive Science Vol.21 No.2
This article examines a graph-theoretical analysis of an externally merged VP as a derivational Fibonacci (F) tree, i.e., a structure written in a Lindenmayer grammar without a linearization condition. We aim to show that the computational procedures of a natural human language (CHL), which is a complex system, solve a dynamically frustrated equation (introduced by Philippe Binder, and proposed as a third factor by Juan Uriagereka) in the human brain. The relevant equation is Kirchhoff’s (electric) current law (KCL) AT y = f, which calculates the equilibrium (balance) in any network. Applying the standard graph-theoretical method, we calculate the hidden optimal balance among VP, vP, and CP as an F network. We calculate the potential (cumulative relative quantity of features) in each node and then the current (relative force of feature flow) along each edge. The graph theory shows that an externally merged antisymmetric VP with binary-node connections conceals an extremely symmetric balance (a KCL solution of zero), wherein almost all the edges disappear and the nodes are almost completely disconnected. In this scenario, KCL qualifies as a dynamically frustrated equation caught in a dilemma between two contradictory dynamics: symmetry breaking and symmetry generation. Our challenge is threefold. First, we aim to calculate the optimal balance hidden in sentential F trees. Second, we reassess Richard Kayne’s insightful “connectivity” proposal. Third, we propose a new hypothesis of phase existence. A frustrated nonphase catalyzes the creation of phases, forcing loop structures of feature inheritance and internal merges. These loops are nonzero solutions of the KCL.
( Koji Arikawa ) 서울대학교 인지과학연구소 2016 Journal of Cognitive Science Vol.17 No.4
Linguists have accumulated evidence for binary merge. This paper adds mathematical reason. The computational procedures of human natural language (CHL) choose binary merge because it can contain more information, and lacks optimal balance. Nature organizes network currents to minimize information loss. This is the physical principle of minimal computation (MC). CHL obeys MC. Nature has created CHL in the human brain. Nature has selected binary merge whose balance is not optimal, and information loss (error) is not minimized. However, this unsettled unbalance (asymmetry) of binary merge drives the infinite growth of binary trees.
( Andrea Y Arikawa ),( Hamed Samavat ),( Mindy S Kurzer ) 대한폐경학회 2021 대한폐경학회지 Vol.27 No.2
Objectives: The purpose of this cross-sectional study was to examine whether single nucleotide polymorphisms (SNPs) in enzymes that metabolize sex steroid hormones were associated with the blood levels of these hormones in postmenopausal women and if the use of menopausal hormone therapy (MHT) could modify this association. Methods: Baseline data were collected from 932 postmenopausal women enrolled in the Minnesota Green Tea Trial. Participants filled out a questionnaire about their demographics, lifestyle factors, and medical and reproductive history. Free, bioavailable, and total serum levels of reproductive hormones were measured through liquid chromatography/tandem mass spectrometry. For genotyping of UGT1A1 (rs10928303), UGT1A4 (rs10929301, rs11673726), UGT1A6 (rs1105879, rs2070959, rs6759892), UGT1A8 (rs10167119), UGT2B7 (rs7439366), and SULT1A1 (rs9282861, rs1968752), mass spectrometry based on multiplex methods and TaqMan assays were performed. Adjusted linear models were fit to assess the associations between SNPs and blood hormones using age, body mass index (BMI), and MHT as covariates. Results: The mean age was 59.8 years, and the mean BMI was 25.1 kg/m2. Past or recent use of MHT was reported by 41.2% of the participants. SNPs in SULT1A1 (rs1968752 and rs9282861) and UGT1A4 (rs11673726) genes were significantly associated with estrone levels, whereas SNPs in UGT1A6 (rs6759892) and UGT1A8 (rs10167119) genes were significantly associated with bioavailable estradiol levels. Conclusions: There was no evidence that MHT use modified the association between SNPs and sex-steroid hormone levels; however, further studies are needed to establish the potential clinical significance of UGT1A4 (rs11673726), UGT1A6 (rs6759892), and UGT1A8 (rs10167119) SNPs and the modulation of hormone levels in postmenopausal women.
Spatial Document Management System for Ubiquitous Mapping
Yoh Shiraishi, Masatoshi Arikawa, Takeshi Sagara, Yasushi Asami 서울시립대학교 도시과학연구원 2006 International journal of urban sciences (IJUS) Vol. No.
This paper proposes a spatial document management system (SDMS) that can easily and directly manage spatial documents. A spatial document is an electronic document that includes spatial reference information, such as HTML file, Excel file, text file and so on. Our system provides a simple interface operating such spatial documents in own personal computer and on the web and manages textual information about Point of Interest (POI) in these documents. When a user can load a spatial document in the system by“ drag and drop”operation, the system converts address expressions in the document into POI information and displays a distribution of the POI information on a map. Our SDMS will support such mapping actions by many ordinary people and become a new tool for “ubiquitous mapping”.
Direct Effect of a Hot Environment on Ruminal Motility in Sheep
Sunagawa, Katsunori,Arikawa, Yuji,Higashi, Mika,Matsuda, Hiroshi,Takahashi, Hiroshi,Kuriwaki, Zyunichi,Kojiya, Zuikou,Uechi, Syuntoku,Hongo, Fujiya Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.6
The aim of this research was to clarify the direct effects of a hot environment on ruminal motility in sheep fed twice a day. In the first experiment, in order to equalize variable factors excluding the ambient temperature between the thermoneutral environment ($23^{\circ}C$, relative humidity 80%) and the hot environment ($32^{\circ}C$, relative humidity 80%), sheep were fed equal amounts of the same quality feed twice a day. The sheep were allowed free access to water for the duration of the two one-hour feeding periods (10:00 am-11:00 am, 5:00 pm-6:00 pm). On the fourth day after exposure to the hot environment, the frequency and strength of ruminal contractions were continuously recorded between 9:30 am and 11:00 pm. Prior to the exposure to a hot environment the frequency and strength of ruminal contractions were recorded in a thermoneutral environment during the period 9:30 am-11:00 pm. In the second experiment, in order to maintain the stomach content of the sheep at equal levels in both environments, the sheep were fed equal amounts of the same quality feed twice a day. Following the completion of the two one-hour feeding periods, a fixed amount of warm water was infused into the rumen. Rumen motility was then recorded during the same period as for the first experiment (9:30 am-11:00 pm). In the first experiment, when the frequency of ruminal contractions prior to (24, 24 frequency/15 min), during (48, 47 frequency/min) and after (22, 19 frequency/min) both the morning and afternoon feeding in a hot environment was compared with the values from the thermoneutral environment (20, 22; 50, 50; 21, 20 frequency/min), there was found to be no difference. However, the strength of ruminal contractions after morning and afternoon feeding (3.7, 3.1 mm Hg) in the hot environment decreased significantly in comparison with the thermoneutral environment (4.3, 3.8 mm Hg). In the second experiment, the frequency of ruminal contractions in the hot environment was not significantly different from that in the thermoneutral environment. The strength of ruminal contractions after ruminal infusion of warm water in the hot environment (morning: 4.6, afternoon: 4.5 mm Hg) was significantly lower than that in the thermoneutral environment (morning: 5.6, afternoon: 5.0 mm Hg). The results suggest that a hot environment acts directly on the strength of ruminal contractions in sheep fed twice a day rather than on the frequency.