In the proposed algorithm, IDLH, the length of the hash sequence and the depth of the hidden layer in the deep learning network are two key parameters.
Figure 4(a) shows the search results of the Average-Retrieval Precision using our proposed algorithm, IDLH, compared with the LSH algorithm  and other three deep learning algorithms, the DH algorithm , the DeepBit algorithm , and the UH-BDNN algorithm  on CIFAR-10 dataset with 8, 16, 32, 48, 64, 96, 128, and 256 bits.
When the number of encoding bits is small, a secondary retrieval method is used in IDLH, and the search accuracy rate can be improved at the expense of a small search speed.
In this paper, we proposed an improved deep-learning-hashing approach, IDLH, which optimized over two major image retrieval process.
Documentation for Immediately Dangerous to Life or Health Concentrations (IDLH): NIOSH Chemical Listing and Documentation of Revised IDLH Values (as of 3/1/95) [Online].
ODOUR THRESHOLDS, EXPOSURE LIMITS, LETHAL CONCENTRATIONS OF INVESTIGATED SOLVENTS Solvent Boiling point, Odour threshold, Exposure IDLH, [degrees]C mg/[m.sup.3] limit, mg/ mg/ [m.sup.3] [m.sup.3] Toluene 110.6 11.1 192 1900 o-Xylene 144.4 4.9 221 4000 Butanol 117.6 (1-butanol) 3.1 (1-butanol) 150 4300 98.5 (2-butanol) 7.7 (2-butanol) Styrene 145.2 4 90 3000
* the 2000, which is rated for 30 min of protection for workers in IDLH conditions;
* the Escort ESCBA/supplied air respirator, a combination escape SCBA and supplied air respirator that offers a high level of respiratory protection in confined areas or IDLH conditions.
is defined as a condition "that poses a threat of exposure to airborne contaminants when that exposure is likely to cause death or immediate or delayed permanent adverse health effects or prevent escape from such an environment (Bolinger, 2004; NIOSH, 2007)." NIOSH incorporates a 30-minute safety factor into all IDLH
values; however, personnel are advised to evacuate immediately if a respirator fails or if equipped with the wrong respirator for IDLH
The National Academy of Science Emergency Exposure Guidance Level (EEGL) for arsine is a 1-hour exposure limit of 1,000 ppb and the National Institute for Occupational Safety and Health (NIOSH) Immediately Dangerous to Life and Health level (IDLH
) is 6,000 ppb.
The LOC is usually determined from the immediately-dangerous-to-life-and-health (IDLH
) levels developed by the National Institute for Occupational Safety and Health (NIOSH).
FOR DISEASE CONTROL & PREVENTION, DOCUMENTATION FOR IMMEDIATELY DANGEROUS TO LIFE OR HEALTH CONCENTRATIONS (IDLHS
) (1994), available at http://www.cdc.gov/niosh/idlh/124389.html.