In 2017, Kazuki TAKEZAWA joined KDDI and was involved in the verification experiments of 5G wireless devices and wireless relays. In 2021, he was seconded to KDDI Research, Inc. He is currently researching radio wave propagation models as a core researcher. In particular, he is studying radio propagation models for outdoor environments using AI/ML and simulations of radio propagation between satellites and the ground. He has also participated in ITU-R WP5D.
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| Country or Area | ISO-alpha2 Code | ISO-alpha3 Code | Developed / Developing regions |
| Algeria | DZ | DZA | Developing |
| Egypt | EG | EGY | Developing |
| Libya | LY | LBY | Developing |
| Morocco | MA | MAR | Developing |
| Sudan | SD | SDN | Developing |
| Tunisia | TN | TUN | Developing |
| Western Sahara | EH | ESH | Developing |
| British Indian Ocean Territory | IO | IOT | Developing |
| Burundi | BI | BDI | Developing |
| Comoros | KM | COM | Developing |
| Djibouti | DJ | DJI | Developing |
| Eritrea | ER | ERI | Developing |
| Ethiopia | ET | ETH | Developing |
| French Southern Territories | TF | ATF | Developing |
| Kenya | KE | KEN | Developing |
| Madagascar | MG | MDG | Developing |
| Malawi | MW | MWI | Developing |
| Mauritius | MU | MUS | Developing |
| Mayotte | YT | MYT | Developing |
| Mozambique | MZ | MOZ | Developing |
| Réunion | RE | REU | Developing |
| Rwanda | RW | RWA | Developing |
| Seychelles | SC | SYC | Developing |
| Somalia | SO | SOM | Developing |
| South Sudan | SS | SSD | Developing |
| Uganda | UG | UGA | Developing |
| United Republic of Tanzania | TZ | TZA | Developing |
| Zambia | ZM | ZMB | Developing |
| Zimbabwe | ZW | ZWE | Developing |
| Angola | AO | AGO | Developing |
| Cameroon | CM | CMR | Developing |
| Central African Republic | CF | CAF | Developing |
| Chad | TD | TCD | Developing |
| Congo | CG | COG | Developing |
| Democratic Republic of the Congo | CD | COD | Developing |
| Equatorial Guinea | GQ | GNQ | Developing |
| Gabon | GA | GAB | Developing |
| Sao Tome and Principe | ST | STP | Developing |
| Botswana | BW | BWA | Developing |
| Eswatini | SZ | SWZ | Developing |
| Lesotho | LS | LSO | Developing |
| Namibia | NA | NAM | Developing |
| South Africa | ZA | ZAF | Developing |
| Benin | BJ | BEN | Developing |
| Burkina Faso | BF | BFA | Developing |
| Cabo Verde | CV | CPV | Developing |
| Côte d’Ivoire | CI | CIV | Developing |
| Gambia | GM | GMB | Developing |
| Ghana | GH | GHA | Developing |
| Guinea | GN | GIN | Developing |
| Guinea-Bissau | GW | GNB | Developing |
| Liberia | LR | LBR | Developing |
| Mali | ML | MLI | Developing |
| Mauritania | MR | MRT | Developing |
| Niger | NE | NER | Developing |
| Nigeria | NG | NGA | Developing |
| Saint Helena | SH | SHN | Developing |
| Senegal | SN | SEN | Developing |
| Sierra Leone | SL | SLE | Developing |
| Togo | TG | TGO | Developing |
| Anguilla | AI | AIA | Developing |
| Antigua and Barbuda | AG | ATG | Developing |
| Aruba | AW | ABW | Developing |
| Bahamas | BS | BHS | Developing |
| Barbados | BB | BRB | Developing |
| Bonaire, Sint Eustatius and Saba | BQ | BES | Developing |
| British Virgin Islands | VG | VGB | Developing |
| Cayman Islands | KY | CYM | Developing |
| Cuba | CU | CUB | Developing |
| Curaçao | CW | CUW | Developing |
| Dominica | DM | DMA | Developing |
| Dominican Republic | DO | DOM | Developing |
| Grenada | GD | GRD | Developing |
| Guadeloupe | GP | GLP | Developing |
| Haiti | HT | HTI | Developing |
| Jamaica | JM | JAM | Developing |
| Martinique | MQ | MTQ | Developing |
| Montserrat | MS | MSR | Developing |
| Puerto Rico | PR | PRI | Developing |
| Saint Barthélemy | BL | BLM | Developing |
| Saint Kitts and Nevis | KN | KNA | Developing |
| Saint Lucia | LC | LCA | Developing |
| Saint Martin (French Part) | MF | MAF | Developing |
| Saint Vincent and the Grenadines | VC | VCT | Developing |
| Sint Maarten (Dutch part) | SX | SXM | Developing |
| Trinidad and Tobago | TT | TTO | Developing |
| Turks and Caicos Islands | TC | TCA | Developing |
| United States Virgin Islands | VI | VIR | Developing |
| Belize | BZ | BLZ | Developing |
| Costa Rica | CR | CRI | Developing |
| El Salvador | SV | SLV | Developing |
| Guatemala | GT | GTM | Developing |
| Honduras | HN | HND | Developing |
| Mexico | MX | MEX | Developing |
| Nicaragua | NI | NIC | Developing |
| Panama | PA | PAN | Developing |
| Argentina | AR | ARG | Developing |
| Bolivia (Plurinational State of) | BO | BOL | Developing |
| Bouvet Island | BV | BVT | Developing |
| Brazil | BR | BRA | Developing |
| Chile | CL | CHL | Developing |
| Colombia | CO | COL | Developing |
| Ecuador | EC | ECU | Developing |
| Falkland Islands (Malvinas) | FK | FLK | Developing |
| French Guiana | GF | GUF | Developing |
| Guyana | GY | GUY | Developing |
| Paraguay | PY | PRY | Developing |
| Peru | PE | PER | Developing |
| South Georgia and the South Sandwich Islands | GS | SGS | Developing |
| Suriname | SR | SUR | Developing |
| Uruguay | UY | URY | Developing |
| Venezuela (Bolivarian Republic of) | VE | VEN | Developing |
| Kazakhstan | KZ | KAZ | Developing |
| Kyrgyzstan | KG | KGZ | Developing |
| Tajikistan | TJ | TJK | Developing |
| Turkmenistan | TM | TKM | Developing |
| Uzbekistan | UZ | UZB | Developing |
| China | CN | CHN | Developing |
| China, Hong Kong Special Administrative Region | HK | HKG | Developing |
| China, Macao Special Administrative Region | MO | MAC | Developing |
| Democratic People’s Republic of Korea | KP | PRK | Developing |
| Mongolia | MN | MNG | Developing |
| Brunei Darussalam | BN | BRN | Developing |
| Cambodia | KH | KHM | Developing |
| Indonesia | ID | IDN | Developing |
| Lao People’s Democratic Republic | LA | LAO | Developing |
| Malaysia | MY | MYS | Developing |
| Myanmar | MM | MMR | Developing |
| Philippines | PH | PHL | Developing |
| Singapore | SG | SGP | Developing |
| Thailand | TH | THA | Developing |
| Timor-Leste | TL | TLS | Developing |
| Viet Nam | VN | VNM | Developing |
| Afghanistan | AF | AFG | Developing |
| Bangladesh | BD | BGD | Developing |
| Bhutan | BT | BTN | Developing |
| India | IN | IND | Developing |
| Iran (Islamic Republic of) | IR | IRN | Developing |
| Maldives | MV | MDV | Developing |
| Nepal | NP | NPL | Developing |
| Pakistan | PK | PAK | Developing |
| Sri Lanka | LK | LKA | Developing |
| Armenia | AM | ARM | Developing |
| Azerbaijan | AZ | AZE | Developing |
| Bahrain | BH | BHR | Developing |
| Georgia | GE | GEO | Developing |
| Iraq | IQ | IRQ | Developing |
| Jordan | JO | JOR | Developing |
| Kuwait | KW | KWT | Developing |
| Lebanon | LB | LBN | Developing |
| Oman | OM | OMN | Developing |
| Qatar | QA | QAT | Developing |
| Saudi Arabia | SA | SAU | Developing |
| State of Palestine | PS | PSE | Developing |
| Syrian Arab Republic | SY | SYR | Developing |
| Turkey | TR | TUR | Developing |
| United Arab Emirates | AE | ARE | Developing |
| Yemen | YE | YEM | Developing |
| Fiji | FJ | FJI | Developing |
| New Caledonia | NC | NCL | Developing |
| Papua New Guinea | PG | PNG | Developing |
| Solomon Islands | SB | SLB | Developing |
| Vanuatu | VU | VUT | Developing |
| Guam | GU | GUM | Developing |
| Kiribati | KI | KIR | Developing |
| Marshall Islands | MH | MHL | Developing |
| Micronesia (Federated States of) | FM | FSM | Developing |
| Nauru | NR | NRU | Developing |
| Northern Mariana Islands | MP | MNP | Developing |
| Palau | PW | PLW | Developing |
| United States Minor Outlying Islands | UM | UMI | Developing |
| American Samoa | AS | ASM | Developing |
| Cook Islands | CK | COK | Developing |
| French Polynesia | PF | PYF | Developing |
| Niue | NU | NIU | Developing |
| Pitcairn | PN | PCN | Developing |
| Samoa | WS | WSM | Developing |
| Tokelau | TK | TKL | Developing |
| Tonga | TO | TON | Developing |
| Tuvalu | TV | TUV | Developing |
| Wallis and Futuna Islands | WF | WLF | Developing |
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