Heart rate variability (HRV) is the physiological phenomenon of variation in the time interval between heartbeats. It is measured by the variation in the beat-to-beat interval. Other terms used include: "cycle length variability", "R–R variability" (where R is a point corresponding to the peak of the QRS complex of the ECG wave; and RR is the interval between successive Rs), and "heart period variability". Methods used to detect beats include: ECG, blood pressure,ballistocardiograms,and the pulse wave signal derived from a photoplethysmograph (PPG). ECG is considered superior because it provides a clear waveform, which makes it easier to exclude heartbeats not originating in the sinoatrial node. The term "NN" is used in place of RR to emphasize the fact that the processed beats are "normal" beats.

Holovanivsk (Ukrainian: Голованівськ) is an urban-type settlement, and is the administrative center of Holovanivsk Raion in the west of Kirovohrad Oblast. Population: 5,759 (2021 est.)

Delta IV Heavyis active; Delta IV Medium, M+(4,2), M+(5,2), and M+(5,4) retired.
Delta IV is a group of five expendable launch systems in the Delta rocket family introduced in the early 2000s. Originally designed by Boeing's Defense, Space and Security division for the Evolved Expendable Launch Vehicle (EELV) program, the Delta IV became a United Launch Alliance (ULA) product in 2006. The Delta IV is primarily a launch vehicle for United States Air Force (USAF) military payloads, but has also been used to launch a number of United States government non-military payloads and a single commercial satellite.

Heart rate variability (HRV) is the physiological phenomenon of variation in the time interval between heartbeats. It is measured by the variation in the beat-to-beat interval. Other terms used include: "cycle length variability", "R–R variability" (where R is a point corresponding to the peak of the QRS complex of the ECG wave; and RR is the interval between successive Rs), and "heart period variability".

Delta IV is a group of five expendable launch systems in the Delta rocket family introduced in the early 2000s. Originally designed by Boeing's Defense, Space and Security division for the Evolved Expendable Launch Vehicle (EELV) program, the Delta IV became a United Launch Alliance (ULA) product in 2006. The Delta IV is primarily a launch vehicle for United States Air Force (USAF) military payloads, but has also been used to launch a number of United States government non-military payloads and a single commercial satellite. The Delta IV originally had two main versions which allowed the family to cover a range of payload sizes and masses: the retired Medium (which had four configurations) and Heavy. As of 2019, only the Heavy remains active, with payloads that would previously fly on Medium moving to either the existing Atlas V or the forthcoming Vulcan. Retirement of the Delta IV is anticipated in 2023. Delta IV vehicles are built in the ULA facility in Decatur, Alabama. Final assembly is completed at the launch site by ULA: at the horizontal integration facility for launches from SLC-37B pad at Cape Canaveral and in a similar facility for launches from SLC-6 pad at Vandenberg Air Force Base.

An Hyuk (born 1968) is a North Korean defector. He formerly lived as an expatriate in China, and repatriated to North Korea in 1986; however, he was accused of spying, and imprisoned at the Yodok concentration camp. He was released in 1989 alongside Kang Chol-Hwan, whom he met while interned at Yodok. The two became friends and had found interest in foreign broadcasting. He was quite interested in outside information and eventually got involved in anti-government activity. He was later identified and watched by the government; fearing he would be sent back to the concentration camp, he planned his escape. In 1992, he and Kang escaped from North Korea by crossing the Yalu River into China. The hardest challenge for them was getting on the train to the border of China undetected. All of the North Korean trains were monitored by the authorities. To gain passage, they had to bribe the police to gain permission to travel. Eventually, they made it to the border city of Chanbai, China near Hyesan, North Korea, where they stayed temporarily, making numerous deals with the North Korean military there by buying them beer and drinks. Later, the North Korean military informed them there was a changing of the guard at 2 AM. An Hyuk and Kang took their chance and crossed the river into China without any complications. After they made it across, North Korean patrols came looking for them, searching for about a week. They hid in China for about 6 months and eventually made their way to Dalian, where some ethnic Koreans helped them get passage to South Korea. Along with Kang and Lee Soon-ok, who was imprisoned in Kaechon concentration camp, he received the Democracy Award from the United States' National Endowment for Democracy in July 2003.

Delta IV
List of Delta 4 launches

An Hyuk (born 1968) is a North Korean defector. He formerly lived as an expatriate in China, and repatriated to North Korea in 1986; however, he was accused of spying, and imprisoned at the Yodok concentration camp. He was released in 1989 alongside Kang Chol-Hwan, whom he met while interned at Yodok. The two became friends and had found interest in foreign broadcasting. He was quite interested in outside information and eventually got involved in anti-government activity. He was later identified and watched by the government; fearing he would be sent back to the concentration camp, he planned his escape.