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A Rational Entry to Cyclic Polymers via Spontaneous and Selective Cyclization Reactions
Daisuke Aoki 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Although recent advances in chemistry have made it possible to synthesize polymers with various topologies, effective routes that selectively afford cyclic topology in high yield and quantity still remain limited. This is mostly due to difficulties associated with purification, and, in particular, the selectivity of macrocyclizations. In this work, effective synthetic methods for the cyclic polymers were developed by utilizing supramolecular chemistry<sup>1</sup> and dynamic covalent chemistry.<sup>2</sup> (1) D. Aoki et al., J. Am. Chem. Soc., 139, 6791 (2017). (2) D. Aoki et al., Angew. Chem. Int. Ed., 59, 4269 (2020).
Eiko Saitoh Aoki,Kumiko Saika,Kazushige Kiguchi,Tohru Morisada,Daisuke Aoki 대한부인종양학회 2023 Journal of Gynecologic Oncology Vol.34 No.2
Objective: In Japan, cervical cancer screening consists of a cytology examination performed once every 2 years. We verified whether the risk of cervical intraepithelial neoplasia (CIN) 3 disease or higher (CIN3+) was equivalent to that of cytology negative cases (negative for intraepithelial lesion or malignancy [NILM]) for patients with a cytological diagnosis of “atypical squamous cells of undetermined significance (ASC-US)” who tested negative for human papillomavirus (HPV). Methods: Data from a total of 22,925 cases who had undergone cervical cancer screening at least twice or who had completed follow-up examinations after cervical screening at a single facility between April 2013 and April 2018 were analyzed. The cumulative incidence of CIN3+ was calculated for each category of initial cytology finding and HPV result (NILM, > ASC-US, ASC-US/HPV (unknown), ASC-US/HPV+, and ASC-US/HPV−). The statistical analysis was conducted using the Cox proportional hazards model. Results: The hazard ratio for the cumulative incidence of CIN3+ in 2 years relative to that for NILM cases was 2.7 (95% confidence interval=1.0–7.8) for > ASC-US cases, 0.5 (0.1–1.7) for ASC-US/HPV (unknown), 0.8 (0.3–2.4) for ASC-US/HPV+ cases, and 0.3 (0.1–1.0) for ASC-US/HPV− cases. Conclusion: Because the cumulative incidence of CIN3+ at 2 years for the ASC-US/HPV− cases was sufficiently low, compared with that of the NILM cases, we considered it reasonable and safe to perform HPV triage for ASC-US cases and to allow HPV-negative cases to return for their next screening in 2 years, which is the same follow-up schedule as that for NILM cases.
Park, Seong-Sik,Aoki, Jun-ichi 한국곤충학회 1986 Korean journal of entomology Vol.16 No.1
한국산 날개응애류중에서 검둥이응애과(Caratodiidae)에 속하는 무늬검둥이응애 (Carabodes transversarius sp. n.)와 어깨점둥이응애 (C. tsushimaensis dorsalis subsp. n.)를 신종으로 기재하고 대마도 검둥이응애 (C. tsushimaensis Aoki, 1970)를 미기록종으로 기록하며 Caradodes속의“femoralis group”의 종검색표를 작성하였다. Two new species and one unrecorded species of Korean oribatid mites belonging to the genus Car-aboder C. L. Koch, 1836 (Carabodiidae) are described. They are C. transversarius sp. nov., C. tsu shimaensis dorsalis subsp. nov. and C. tsushimaensis Aoki, 1970. A Key to the species of“femoralis group”of the genus Caradodes is presented.
韓國產 날개응애類(3) Defectamerus 屬의 新種에 關하여
SEONG SIK CHOI,JUN-ICHI AOKI 한국응용곤충학회 1985 한국응용곤충학회지 Vol.24 No.3
Defectamerus soonkii sp. nov. and D. crassisetiger coreanus subsp. nov. belonging to the family Ameridae are described. Key to the species of the genus Defectamerus Aoki is presented. 한국산(韓國産) Defectamerus속(屬)의 1 신종(新種), 1 신아종(新亞種) 및 종검색표(種檢索表)를 작성(作成)하였다. 신종(新種)은 순기민동정응애(D. soonkii sp. nov.)와 신아종(新亞種)으로 한국민동정응애(D. crassisetiger coreanus subsp. nov.)를 기재(記載)하였다.
Search for the H Dibaryon in (K^-,K^+) Reactions
Aoki, S.,Chung, K.S.,Park, I.G.,Song, J. S. 慶尙大學校 기초과학연구소 1990 基礎科學硏究所報 Vol.6 No.-
We have studied (K^-,K^+) reactions from an emulsion target. The S=-2H dibaryon has been searched for by the analysis of the K^+ momentum spectrum together with emulsion data. No evidence of H production was observed in the mass range of 1.90-2.16 GeV/C^2. Upper limits for the production cross section of the H are (0.2-0.6)% of that for the quasifree≡^- production at the 90% confidence level.
Structural identification and seismic performance of brick chimneys, Tokoname, Japan
Aoki, T.,Sabia, D. Techno-Press 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.21 No.5
Dynamic and static analyses of existing structures are very important to obtain reliable information relating to actual structural properties. For this purpose a series of material test, dynamic test and static collapse test of the existing two brick chimneys, in Tokoname, are carried out. From the material tests, Young's modulus and compressive strength of the brick used for these chimneys are estimated to be 3200 MPa and 7.5 MPa, respectively. The results of static collapse test of the existing two brick chimneys are discussed in this paper and composed with the results from FEA (Finite Element analysis). From the results of dynamic tests, the fundamental frequencies of Howa and Iwata brick chimneys are estimated to be about 2.69 Hz and 2.93 Hz, respectively. Their natural modes are identified by ARMAV (Autoregressive Moving Average Vectors) model. On the basis of the static and dynamic experimental tests, a numerical model has been prepared. According to the European code (Eurocode n. 8: "Design of structures for earthquake resistance") non-linear static (Pushover) analysis of the two chimneys is carried out and they seem to be vulnerable to earthquakes with 0.25 to 0.35 g.
Hydrogen Absorption and Desorption in Ti-Al Alloys
Aoki, K .,Ishikawa, K .,Hashi, K . 대한금속재료학회(대한금속학회) 2001 METALS AND MATERIALS International Vol.7 No.2
Binary Ti_(1-x)Al_x and ternary Ti_(.075-x)Al_(0.25)M_x (M=V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb, Mo, Pd, Hf, Ta and W; x=0.15 and 0.25) alloys reacted slowly with 5.0 ㎫ Hz at room temperature for different periods. The hydrogen absorption capacity, the 50% hydrogen desorption temperature (T_d) and the structures of their hydride were investigated. Amorphous and fcc type hydrides formed by hydrogenation of the binary Ti-Al alloys. As the Al concentration increased in the Ti-Al alloys, the hydrogen absorption capacity decreased, while the hydrogen desorption temperature decreased at once and then increased again. Amorphous, fcc, bcc and C14 Laves type hydrides formed by hydrogenation of the ternary Ti₃Al- based alloys. The hydrogen absorption capacity was reduced despite whatever elements were substituted for Ti in Ti₃Al. Ni, Co, Mn and Nb have the ability to reduce T_d of Ti_(.075-x)Al_(0.25)M_x.
The Concept of the 'Launching State' Revisited
Aoki, Setsuko 한국항공우주법학회 2002 한국항공우주정책·법학회지 Vol.15 No.-
Commercialization and privatization of outer space has been developing to the extent that public space law regime established at the UN seems to be somewhat incompatible with the today's commercial launching services. Thus, this paper analyzes, at first, the UN space treaties to specify the obstacles for promoting commercial use. The necessity of some covert amendment of UN treaties is suggested through the national space legislation. Then three state practices are examined to propose a new concept of the "launching state" including the Sea Launch project, since the concept of the "launching state" is of the major importance to enact an effective national act to better accommodate UN space treaties to the present necessity.