Terahertz GUSSS

Terahertz technology has attracted the attention of researchers for many years, and it has seen many advances over the past decades. Special interest for the use of this technology is directed to the detection of illegal drugs, explosives and other hazardous materials. These materials exhibit characteristic signatures at terahertz wavelengths which may be used to identify them. In this paper we present a new method for detecting the presence of chemicals and other materials using their terahertz signatures and a new technique for signature recognition called Guided Under-determined Source Signal Separation (GUSSS). Our method requires only one sensor and by employing one single feature and a simple classifier we already obtained very good classification performances. The method was tested using a public THz database, achieving high true positive and true negative percentages.

Detected Material:			Manzeb
Additional Training Materials:			ADP, Albumin, DAST, H2S, HgS, Lumiflavin, MgO
Additional Testing Materials:			Glucose, SiN

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	100.0	100.0	100.0	[0.10, 0.20]	100.0	100.0	100.0	[0.10, 0.20]	100.0	100.0	100.0
[0.20, 0.30]	100.0	100.0	100.0	[0.20, 0.30]	100.0	100.0	100.0	[0.20, 0.30]	100.0	100.0	100.0
[0.30, 0.40]	100.0	100.0	100.0	[0.30, 0.40]	100.0	100.0	100.0	[0.30, 0.40]	100.0	100.0	100.0
[0.40, 0.50]	100.0	100.0	100.0	[0.40, 0.50]	100.0	100.0	100.0	[0.40, 0.50]	100.0	100.0	100.0
[0.50, 0.60]	100.0	100.0	100.0	[0.50, 0.60]	100.0	100.0	100.0	[0.50, 0.60]	100.0	100.0	100.0
[0.60, 0.70]	100.0	100.0	100.0	[0.60, 0.70]	100.0	100.0	100.0	[0.60, 0.70]	100.0	100.0	100.0
[0.70, 0.80]	100.0	100.0	100.0	[0.70, 0.80]	100.0	100.0	100.0	[0.70, 0.80]	100.0	100.0	100.0
[0.80, 0.90]	100.0	100.0	100.0	[0.80, 0.90]	100.0	100.0	100.0	[0.80, 0.90]	100.0	100.0	100.0
[0.90, 0.95]	100.0	100.0	100.0	[0.90, 0.95]	100.0	100.0	100.0	[0.90, 0.95]	100.0	100.0	100.0


Detected Material:			Talc
Additional Training Materials:			Equal, Sodium Chloride, ADP, Albumin, Lumiflavin, MgO, NAC
Additional Testing Materials:			H2S, DAST

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	62.8	55.6	59.2	[0.10, 0.20]	71.8	43.4	57.6	[0.10, 0.20]	79.2	42.0	60.6
[0.20, 0.30]	69.6	61.2	65.4	[0.20, 0.30]	85.6	54.4	70.0	[0.20, 0.30]	81.6	46.8	64.2
[0.30, 0.40]	77.4	72.8	75.1	[0.30, 0.40]	89.0	63.0	76.0	[0.30, 0.40]	84.8	63.2	74.0
[0.40, 0.50]	85.4	77.6	81.5	[0.40, 0.50]	92.8	65.0	78.9	[0.40, 0.50]	85.2	72.2	78.7
[0.50, 0.60]	93.0	81.6	87.3	[0.50, 0.60]	93.2	79.2	86.2	[0.50, 0.60]	92.0	80.0	86.0
[0.60, 0.70]	93.4	91.4	92.4	[0.60, 0.70]	95.4	81.8	88.6	[0.60, 0.70]	96.8	86.0	91.4
[0.70, 0.80]	96.2	91.8	94.0	[0.70, 0.80]	97.0	89.8	93.4	[0.70, 0.80]	96.8	92.8	94.8
[0.80, 0.90]	97.8	95.8	96.8	[0.80, 0.90]	98.0	95.2	96.6	[0.80, 0.90]	98.0	97.6	97.8
[0.90, 0.95]	96.6	98.0	97.3	[0.90, 0.95]	96.8	97.8	97.3	[0.90, 0.95]	96.2	99.6	97.9


Detected Material:			Baking Soda
Additional Training Materials:			Caffeine, Cellulose, Coffee Ground, O2Si, Ovalbumin, Sodium Chloride, Talc
Additional Testing Materials:			Equal, Trehalose

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	62.6	57.6	60.1	[0.10, 0.20]	64.6	50.0	57.3	[0.10, 0.20]	61.2	59.6	60.4
[0.20, 0.30]	74.2	62.6	68.4	[0.20, 0.30]	60.8	74.0	67.4	[0.20, 0.30]	70.6	71.2	70.9
[0.30, 0.40]	74.4	74.6	74.5	[0.30, 0.40]	72.2	81.6	76.9	[0.30, 0.40]	74.8	74.8	74.8
[0.40, 0.50]	80.8	83.0	81.9	[0.40, 0.50]	79.0	79.8	79.4	[0.40, 0.50]	72.6	91.0	81.8
[0.50, 0.60]	79.6	92.0	85.8	[0.50, 0.60]	82.0	89.4	85.7	[0.50, 0.60]	79.6	87.8	83.7
[0.60, 0.70]	80.8	95.2	88.0	[0.60, 0.70]	83.2	89.2	86.2	[0.60, 0.70]	76.0	96.6	86.3
[0.70, 0.80]	73.0	98.2	85.6	[0.70, 0.80]	82.0	91.8	86.9	[0.70, 0.80]	81.2	94.6	87.9
[0.80, 0.90]	76.6	97.4	87.0	[0.80, 0.90]	84.2	92.0	88.1	[0.80, 0.90]	82.0	96.4	89.2
[0.90, 0.95]	81.8	97.0	89.4	[0.90, 0.95]	88.8	94.2	91.5	[0.90, 0.95]	88.6	94.2	91.4


Detected Material:			ADP
Additional Training Materials:			Talc, Albumin, DAST, Glucose, H2S, Lumiflavin, NAC
Additional Testing Materials:			O2Si, MgO

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	75.4	61.0	68.2	[0.10, 0.20]	86.0	29.0	57.5	[0.10, 0.20]	62.6	76.8	69.7
[0.20, 0.30]	84.0	69.8	76.9	[0.20, 0.30]	91.8	55.0	73.4	[0.20, 0.30]	78.0	91.2	84.6
[0.30, 0.40]	94.2	78.0	86.1	[0.30, 0.40]	93.0	80.2	86.6	[0.30, 0.40]	86.6	95.2	90.9
[0.40, 0.50]	97.2	86.2	91.7	[0.40, 0.50]	94.2	98.2	96.2	[0.40, 0.50]	95.2	98.2	96.7
[0.50, 0.60]	98.2	99.2	98.7	[0.50, 0.60]	98.2	99.8	99.0	[0.50, 0.60]	96.8	99.4	98.1
[0.60, 0.70]	98.4	99.4	98.9	[0.60, 0.70]	98.6	100.0	99.3	[0.60, 0.70]	98.6	99.6	99.1
[0.70, 0.80]	100.0	99.8	99.9	[0.70, 0.80]	98.2	100.0	99.1	[0.70, 0.80]	99.4	99.6	99.5
[0.80, 0.90]	100.0	100.0	100.0	[0.80, 0.90]	99.6	100.0	99.8	[0.80, 0.90]	100.0	99.8	99.9
[0.90, 0.95]	100.0	100.0	100.0	[0.90, 0.95]	100.0	100.0	100.0	[0.90, 0.95]	100.0	100.0	100.0


Detected Material:			Glucose
Additional Training Materials:			Baking Soda, Cellulose, O2Si, Ovalbumin, Sodium Chloride, Talc, NAC
Additional Testing Materials:			Coffee Ground, HgS

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	59.0	63.0	61.0	[0.10, 0.20]	60.8	59.4	60.1	[0.10, 0.20]	52.8	70.2	61.5
[0.20, 0.30]	74.6	69.8	72.2	[0.20, 0.30]	77.8	60.4	69.1	[0.20, 0.30]	72.8	73.4	73.1
[0.30, 0.40]	85.8	79.2	82.5	[0.30, 0.40]	90.8	67.2	79.0	[0.30, 0.40]	85.0	81.2	83.1
[0.40, 0.50]	96.8	83.4	90.1	[0.40, 0.50]	92.6	90.4	91.5	[0.40, 0.50]	94.6	88.2	91.4
[0.50, 0.60]	99.8	89.4	94.6	[0.50, 0.60]	97.6	96.2	96.9	[0.50, 0.60]	97.6	97.2	97.4
[0.60, 0.70]	100.0	90.2	95.1	[0.60, 0.70]	99.0	98.8	98.9	[0.60, 0.70]	99.6	98.4	99.0
[0.70, 0.80]	100.0	96.6	98.3	[0.70, 0.80]	99.0	100.0	99.5	[0.70, 0.80]	99.6	99.6	99.6
[0.80, 0.90]	100.0	97.6	98.8	[0.80, 0.90]	97.6	100.0	98.8	[0.80, 0.90]	99.4	99.8	99.6
[0.90, 0.95]	100.0	98.4	99.2	[0.90, 0.95]	95.6	100.0	97.8	[0.90, 0.95]	99.6	99.8	99.7


Detected Material:			DAST
Additional Training Materials:			Caffeine, Equal, ADP, Albumin, H2S, Lumiflavin, NAC
Additional Testing Materials:			Sodium Chloride, Glucose

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	76.6	45.0	60.8	[0.10, 0.20]	88.4	28.0	58.2	[0.10, 0.20]	67.6	56.4	62.0
[0.20, 0.30]	85.8	58.0	71.9	[0.20, 0.30]	92.8	35.0	63.9	[0.20, 0.30]	81.2	70.2	75.7
[0.30, 0.40]	92.2	67.2	79.7	[0.30, 0.40]	93.2	62.0	77.6	[0.30, 0.40]	86.8	78.6	82.7
[0.40, 0.50]	96.4	77.2	86.8	[0.40, 0.50]	96.2	73.0	84.6	[0.40, 0.50]	88.2	90.2	89.2
[0.50, 0.60]	98.0	86.6	92.3	[0.50, 0.60]	98.4	90.6	94.5	[0.50, 0.60]	95.4	90.6	93.0
[0.60, 0.70]	97.8	97.2	97.5	[0.60, 0.70]	98.8	93.8	96.3	[0.60, 0.70]	98.0	96.2	97.1
[0.70, 0.80]	99.6	97.8	98.7	[0.70, 0.80]	99.4	96.0	97.7	[0.70, 0.80]	99.6	97.4	98.5
[0.80, 0.90]	100.0	98.6	99.3	[0.80, 0.90]	99.8	99.4	99.6	[0.80, 0.90]	100.0	99.0	99.5
[0.90, 0.95]	100.0	99.0	99.5	[0.90, 0.95]	100.0	98.2	99.1	[0.90, 0.95]	100.0	99.6	99.8


Detected Material:			Lumiflavin
Additional Training Materials:			Caffeine, O2Si, Albumin, DAST, Glucose, MgO, SiN
Additional Testing Materials:			Cellulose, Coffee Ground

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	36.8	71.6	54.2	[0.10, 0.20]	51.2	58.6	54.9	[0.10, 0.20]	45.2	67.0	56.1
[0.20, 0.30]	42.4	78.6	60.5	[0.20, 0.30]	62.2	62.8	62.5	[0.20, 0.30]	25.4	93.4	59.4
[0.30, 0.40]	53.2	83.6	68.4	[0.30, 0.40]	63.2	66.4	64.8	[0.30, 0.40]	47.2	90.8	69.0
[0.40, 0.50]	60.2	86.8	73.5	[0.40, 0.50]	67.0	77.0	72.0	[0.40, 0.50]	51.8	93.2	72.5
[0.50, 0.60]	66.8	95.4	81.1	[0.50, 0.60]	75.8	83.4	79.6	[0.50, 0.60]	65.8	92.4	79.1
[0.60, 0.70]	80.8	87.6	84.2	[0.60, 0.70]	79.4	91.4	85.4	[0.60, 0.70]	72.8	95.0	83.9
[0.70, 0.80]	84.8	95.8	90.3	[0.70, 0.80]	85.0	97.0	91.0	[0.70, 0.80]	77.2	97.2	87.2
[0.80, 0.90]	88.6	96.2	92.4	[0.80, 0.90]	94.0	95.8	94.9	[0.80, 0.90]	86.0	95.2	90.6
[0.90, 0.95]	89.6	95.8	92.7	[0.90, 0.95]	93.2	96.6	94.9	[0.90, 0.95]	89.6	97.2	93.4


Detected Material:			Cellulose
Additional Training Materials:			Ovalbumin, Sodium Chloride, ADP, DAST, H2S, Manzeb, MgO
Additional Testing Materials:			NAC, Quartz

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	30.4	79.4	54.9	[0.10, 0.20]	37.8	73.0	55.4	[0.10, 0.20]	46.0	65.4	55.7
[0.20, 0.30]	39.0	85.0	62.0	[0.20, 0.30]	49.6	78.0	63.8	[0.20, 0.30]	42.4	84.6	63.5
[0.30, 0.40]	50.2	87.2	68.7	[0.30, 0.40]	62.8	83.2	73.0	[0.30, 0.40]	63.0	82.8	72.9
[0.40, 0.50]	64.0	90.6	77.3	[0.40, 0.50]	69.8	88.8	79.3	[0.40, 0.50]	61.4	91.0	76.2
[0.50, 0.60]	77.2	92.2	84.7	[0.50, 0.60]	76.4	93.8	85.1	[0.50, 0.60]	71.4	95.4	83.4
[0.60, 0.70]	86.0	94.4	90.2	[0.60, 0.70]	86.6	95.6	91.1	[0.60, 0.70]	82.8	95.6	89.2
[0.70, 0.80]	96.8	95.4	96.1	[0.70, 0.80]	93.6	94.8	94.2	[0.70, 0.80]	93.8	95.4	94.6
[0.80, 0.90]	98.4	96.4	97.4	[0.80, 0.90]	99.0	97.4	98.2	[0.80, 0.90]	97.8	94.6	96.2
[0.90, 0.95]	99.4	96.6	98.0	[0.90, 0.95]	99.8	96.6	98.2	[0.90, 0.95]	99.4	96.8	98.1


Detected Material:			MgO
Additional Training Materials:			ADP, Albumin, DAST, Glucose, H2S, HgS, NAC
Additional Testing Materials:			Lumiflavin, Manzeb

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	93.8	93.0	93.4	[0.10, 0.20]	89.4	95.2	92.3	[0.10, 0.20]	97.0	91.8	94.4
[0.20, 0.30]	100.0	92.6	96.3	[0.20, 0.30]	95.4	96.8	96.1	[0.20, 0.30]	100.0	95.4	97.7
[0.30, 0.40]	100.0	94.2	97.1	[0.30, 0.40]	99.6	96.2	97.9	[0.30, 0.40]	100.0	95.0	97.5
[0.40, 0.50]	100.0	93.0	96.5	[0.40, 0.50]	99.8	96.8	98.3	[0.40, 0.50]	100.0	99.4	99.7
[0.50, 0.60]	100.0	94.4	97.2	[0.50, 0.60]	100.0	97.8	98.9	[0.50, 0.60]	100.0	100.0	100.0
[0.60, 0.70]	100.0	96.4	98.2	[0.60, 0.70]	100.0	100.0	100.0	[0.60, 0.70]	100.0	100.0	100.0
[0.70, 0.80]	100.0	94.8	97.4	[0.70, 0.80]	100.0	100.0	100.0	[0.70, 0.80]	100.0	100.0	100.0
[0.80, 0.90]	100.0	95.8	97.9	[0.80, 0.90]	100.0	97.4	98.7	[0.80, 0.90]	100.0	100.0	100.0
[0.90, 0.95]	100.0	96.2	98.1	[0.90, 0.95]	100.0	96.2	98.1	[0.90, 0.95]	100.0	100.0	100.0


Detected Material:			HgS
Additional Training Materials:			Caffeine, Cellulose, Chalk, Coffee Ground, Equal, O2Si, Talc
Additional Testing Materials:			Sodium Chloride, DAST

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	86.6	74.2	80.4	[0.10, 0.20]	91.0	71.6	81.3	[0.10, 0.20]	87.8	73.6	80.7
[0.20, 0.30]	98.6	84.0	91.3	[0.20, 0.30]	97.2	87.4	92.3	[0.20, 0.30]	92.6	86.2	89.4
[0.30, 0.40]	99.2	90.4	94.8	[0.30, 0.40]	98.6	95.0	96.8	[0.30, 0.40]	99.2	95.6	97.4
[0.40, 0.50]	100.0	97.4	98.7	[0.40, 0.50]	97.8	99.2	98.5	[0.40, 0.50]	99.4	99.2	99.3
[0.50, 0.60]	100.0	98.6	99.3	[0.50, 0.60]	100.0	100.0	100.0	[0.50, 0.60]	99.8	98.8	99.3
[0.60, 0.70]	100.0	99.4	99.7	[0.60, 0.70]	99.6	99.6	99.6	[0.60, 0.70]	100.0	100.0	100.0
[0.70, 0.80]	100.0	99.8	99.9	[0.70, 0.80]	100.0	99.8	99.9	[0.70, 0.80]	99.4	100.0	99.7
[0.80, 0.90]	100.0	99.6	99.8	[0.80, 0.90]	100.0	99.0	99.5	[0.80, 0.90]	100.0	99.4	99.7
[0.90, 0.95]	100.0	99.8	99.9	[0.90, 0.95]	100.0	99.8	99.9	[0.90, 0.95]	99.8	99.8	99.8


Detected Material:			Caffeine
Additional Training Materials:			Baking Soda, Cellulose, Chalk, Coffee Ground, Equal, Sodium Chloride, DAST
Additional Testing Materials:			Ovalbumin, Albumin

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	89.4	36.6	63.0	[0.10, 0.20]	90.2	38.2	64.2	[0.10, 0.20]	72.6	76.6	74.6
[0.20, 0.30]	88.6	77.6	83.1	[0.20, 0.30]	96.0	21.0	58.5	[0.20, 0.30]	88.6	86.0	87.3
[0.30, 0.40]	95.2	82.0	88.6	[0.30, 0.40]	97.4	37.0	67.2	[0.30, 0.40]	92.6	94.0	93.3
[0.40, 0.50]	96.4	94.6	95.5	[0.40, 0.50]	95.8	71.6	83.7	[0.40, 0.50]	99.0	96.4	97.7
[0.50, 0.60]	94.8	97.2	96.0	[0.50, 0.60]	97.4	81.0	89.2	[0.50, 0.60]	99.8	100.0	99.9
[0.60, 0.70]	96.8	99.4	98.1	[0.60, 0.70]	96.2	100.0	98.1	[0.60, 0.70]	99.8	99.6	99.7
[0.70, 0.80]	93.6	99.4	96.5	[0.70, 0.80]	94.6	99.8	97.2	[0.70, 0.80]	99.6	98.6	99.1
[0.80, 0.90]	94.8	100.0	97.4	[0.80, 0.90]	96.0	100.0	98.0	[0.80, 0.90]	99.6	99.2	99.4
[0.90, 0.95]	95.6	99.6	97.6	[0.90, 0.95]	97.6	99.4	98.5	[0.90, 0.95]	96.8	99.8	98.3


Detected Material:			Chalk
Additional Training Materials:			Cellulose, Coffee Ground, Equal, O2Si, Ovalbumin, Sodium Chloride, Talc
Additional Testing Materials:			Baking Soda, Caffeine

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	41.4	75.8	58.6	[0.10, 0.20]	42.6	74.2	58.4	[0.10, 0.20]	43.6	67.4	55.5
[0.20, 0.30]	49.8	78.2	64.0	[0.20, 0.30]	54.2	77.8	66.0	[0.20, 0.30]	76.8	67.2	72.0
[0.30, 0.40]	54.4	83.8	69.1	[0.30, 0.40]	72.2	80.2	76.2	[0.30, 0.40]	76.6	71.8	74.2
[0.40, 0.50]	62.4	92.2	77.3	[0.40, 0.50]	86.6	83.6	85.1	[0.40, 0.50]	84.6	81.4	83.0
[0.50, 0.60]	61.0	93.6	77.3	[0.50, 0.60]	93.2	86.2	89.7	[0.50, 0.60]	89.8	88.2	89.0
[0.60, 0.70]	79.8	95.6	87.7	[0.60, 0.70]	97.4	82.2	89.8	[0.60, 0.70]	92.4	91.4	91.9
[0.70, 0.80]	81.0	94.6	87.8	[0.70, 0.80]	95.4	85.0	90.2	[0.70, 0.80]	90.6	92.4	91.5
[0.80, 0.90]	73.4	97.0	85.2	[0.80, 0.90]	94.4	88.2	91.3	[0.80, 0.90]	91.6	88.4	90.0
[0.90, 0.95]	71.6	95.2	83.4	[0.90, 0.95]	93.8	80.8	87.3	[0.90, 0.95]	87.8	87.8	87.8


Detected Material:			Sodium Chloride
Additional Training Materials:			Caffeine, Cellulose, Ovalbumin, Lumiflavin, Manzeb, NAC, SiN
Additional Testing Materials:			Albumin, Glucose

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	55.4	83.0	69.2	[0.10, 0.20]	63.4	78.6	71.0	[0.10, 0.20]	86.6	62.6	74.6
[0.20, 0.30]	78.8	87.8	83.3	[0.20, 0.30]	80.6	88.2	84.4	[0.20, 0.30]	95.4	79.2	87.3
[0.30, 0.40]	96.4	90.8	93.6	[0.30, 0.40]	98.6	91.6	95.1	[0.30, 0.40]	94.8	91.0	92.9
[0.40, 0.50]	98.4	96.2	97.3	[0.40, 0.50]	100.0	94.0	97.0	[0.40, 0.50]	99.8	95.0	97.4
[0.50, 0.60]	100.0	97.6	98.8	[0.50, 0.60]	100.0	93.8	96.9	[0.50, 0.60]	100.0	97.2	98.6
[0.60, 0.70]	100.0	98.4	99.2	[0.60, 0.70]	100.0	97.4	98.7	[0.60, 0.70]	100.0	99.6	99.8
[0.70, 0.80]	100.0	99.0	99.5	[0.70, 0.80]	100.0	99.2	99.6	[0.70, 0.80]	100.0	100.0	100.0
[0.80, 0.90]	100.0	100.0	100.0	[0.80, 0.90]	100.0	99.8	99.9	[0.80, 0.90]	100.0	100.0	100.0
[0.90, 0.95]	99.0	100.0	99.5	[0.90, 0.95]	100.0	100.0	100.0	[0.90, 0.95]	100.0	100.0	100.0


Detected Material:			NAC
Additional Training Materials:			Caffeine, Cellulose, Chalk, O2Si, Ovalbumin, Sodium Chloride, Talc
Additional Testing Materials:			Coffee Ground, Equal

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	78.8	34.6	56.7	[0.10, 0.20]	83.0	30.0	56.5	[0.10, 0.20]	74.6	98.6	86.6
[0.20, 0.30]	82.8	37.6	60.2	[0.20, 0.30]	83.0	35.6	59.3	[0.20, 0.30]	75.8	99.8	87.8
[0.30, 0.40]	85.2	95.2	90.2	[0.30, 0.40]	85.2	98.6	91.9	[0.30, 0.40]	83.4	99.8	91.6
[0.40, 0.50]	90.0	100.0	95.0	[0.40, 0.50]	89.6	100.0	94.8	[0.40, 0.50]	96.4	100.0	98.2
[0.50, 0.60]	92.2	100.0	96.1	[0.50, 0.60]	97.8	100.0	98.9	[0.50, 0.60]	100.0	100.0	100.0
[0.60, 0.70]	99.8	100.0	99.9	[0.60, 0.70]	99.8	100.0	99.9	[0.60, 0.70]	99.8	100.0	99.9
[0.70, 0.80]	100.0	100.0	100.0	[0.70, 0.80]	100.0	100.0	100.0	[0.70, 0.80]	100.0	100.0	100.0
[0.80, 0.90]	100.0	100.0	100.0	[0.80, 0.90]	100.0	100.0	100.0	[0.80, 0.90]	100.0	100.0	100.0
[0.90, 0.95]	99.6	100.0	99.8	[0.90, 0.95]	100.0	100.0	100.0	[0.90, 0.95]	100.0	100.0	100.0


Detected Material:			SiN
Additional Training Materials:			Caffeine, Chalk, Coffee Ground, Equal, Ovalbumin, DAST, NAC
Additional Testing Materials:			O2Si, Sodium Chloride

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	60.6	70.2	65.4	[0.10, 0.20]	72.4	62.0	67.2	[0.10, 0.20]	70.8	61.0	65.9
[0.20, 0.30]	51.0	88.8	69.9	[0.20, 0.30]	89.8	57.0	73.4	[0.20, 0.30]	78.2	70.4	74.3
[0.30, 0.40]	79.4	86.0	82.7	[0.30, 0.40]	95.0	58.8	76.9	[0.30, 0.40]	89.8	79.2	84.5
[0.40, 0.50]	93.4	88.8	91.1	[0.40, 0.50]	97.0	72.6	84.8	[0.40, 0.50]	93.6	88.4	91.0
[0.50, 0.60]	93.8	92.8	93.3	[0.50, 0.60]	97.2	83.6	90.4	[0.50, 0.60]	97.8	89.2	93.5
[0.60, 0.70]	97.6	95.0	96.3	[0.60, 0.70]	98.0	92.4	95.2	[0.60, 0.70]	97.0	94.2	95.6
[0.70, 0.80]	97.6	97.0	97.3	[0.70, 0.80]	98.2	95.6	96.9	[0.70, 0.80]	98.6	95.8	97.2
[0.80, 0.90]	98.2	97.8	98.0	[0.80, 0.90]	99.0	96.8	97.9	[0.80, 0.90]	99.0	97.8	98.4
[0.90, 0.95]	98.4	99.0	98.7	[0.90, 0.95]	99.0	96.6	97.8	[0.90, 0.95]	98.0	97.2	97.6


Detected Material:			Albumin
Additional Training Materials:			Coffee Ground, Equal, O2Si, Sodium Chloride, H2S, MgO, SiN
Additional Testing Materials:			Talc, HgS

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	37.4	13.8	25.6	[0.10, 0.20]	40.2	16.4	28.3	[0.10, 0.20]	52.0	91.6	71.8
[0.20, 0.30]	57.6	69.2	63.4	[0.20, 0.30]	61.8	52.6	57.2	[0.20, 0.30]	41.4	88.4	64.9
[0.30, 0.40]	75.6	93.8	84.7	[0.30, 0.40]	84.4	83.6	84.0	[0.30, 0.40]	76.2	92.8	84.5
[0.40, 0.50]	88.2	97.0	92.6	[0.40, 0.50]	91.8	95.4	93.6	[0.40, 0.50]	81.8	99.8	90.8
[0.50, 0.60]	98.0	98.4	98.2	[0.50, 0.60]	96.2	98.8	97.5	[0.50, 0.60]	97.6	97.4	97.5
[0.60, 0.70]	98.8	99.8	99.3	[0.60, 0.70]	97.4	100.0	98.7	[0.60, 0.70]	99.2	99.8	99.5
[0.70, 0.80]	100.0	100.0	100.0	[0.70, 0.80]	100.0	100.0	100.0	[0.70, 0.80]	99.8	100.0	99.9
[0.80, 0.90]	100.0	100.0	100.0	[0.80, 0.90]	99.8	100.0	99.9	[0.80, 0.90]	100.0	100.0	100.0
[0.90, 0.95]	100.0	100.0	100.0	[0.90, 0.95]	100.0	100.0	100.0	[0.90, 0.95]	100.0	100.0	100.0


Detected Material:			Ovalbumin
Additional Training Materials:			Baking Soda, Caffeine, Chalk, Coffee Ground, O2Si, Sodium Chloride, Talc
Additional Testing Materials:			Cellulose, Equal

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	82.2	61.0	71.6	[0.10, 0.20]	87.8	48.8	68.3	[0.10, 0.20]	91.2	40.8	66.0
[0.20, 0.30]	94.0	75.0	84.5	[0.20, 0.30]	95.4	62.2	78.8	[0.20, 0.30]	95.4	61.2	78.3
[0.30, 0.40]	98.4	72.2	85.3	[0.30, 0.40]	97.6	77.4	87.5	[0.30, 0.40]	97.6	74.0	85.8
[0.40, 0.50]	99.2	80.4	89.8	[0.40, 0.50]	99.4	84.0	91.7	[0.40, 0.50]	99.0	86.2	92.6
[0.50, 0.60]	99.2	89.6	94.4	[0.50, 0.60]	99.0	90.0	94.5	[0.50, 0.60]	99.2	94.2	96.7
[0.60, 0.70]	100.0	88.4	94.2	[0.60, 0.70]	100.0	94.8	97.4	[0.60, 0.70]	99.4	94.0	96.7
[0.70, 0.80]	100.0	93.6	96.8	[0.70, 0.80]	100.0	97.0	98.5	[0.70, 0.80]	99.6	97.4	98.5
[0.80, 0.90]	100.0	95.2	97.6	[0.80, 0.90]	100.0	97.2	98.6	[0.80, 0.90]	99.0	99.0	99.0
[0.90, 0.95]	100.0	93.6	96.8	[0.90, 0.95]	100.0	98.4	99.2	[0.90, 0.95]	100.0	98.0	99.0


Detected Material:			Trehalose
Additional Training Materials:			Coffee Ground, Equal, O2Si, Sodium Chloride, Talc, ADP, Glucose
Additional Testing Materials:			Caffeine, DAST

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	72.4	59.2	65.8	[0.10, 0.20]	84.2	50.0	67.1	[0.10, 0.20]	16.6	92.6	54.6
[0.20, 0.30]	85.0	66.2	75.6	[0.20, 0.30]	89.6	64.4	77.0	[0.20, 0.30]	91.6	62.2	76.9
[0.30, 0.40]	96.0	72.4	84.2	[0.30, 0.40]	94.4	75.8	85.1	[0.30, 0.40]	96.2	71.2	83.7
[0.40, 0.50]	99.0	81.0	90.0	[0.40, 0.50]	99.6	77.4	88.5	[0.40, 0.50]	98.2	87.0	92.6
[0.50, 0.60]	100.0	82.4	91.2	[0.50, 0.60]	100.0	85.2	92.6	[0.50, 0.60]	99.8	91.4	95.6
[0.60, 0.70]	100.0	88.6	94.3	[0.60, 0.70]	100.0	92.8	96.4	[0.60, 0.70]	100.0	96.8	98.4
[0.70, 0.80]	100.0	91.2	95.6	[0.70, 0.80]	100.0	98.2	99.1	[0.70, 0.80]	99.4	99.0	99.2
[0.80, 0.90]	100.0	95.2	97.6	[0.80, 0.90]	100.0	98.8	99.4	[0.80, 0.90]	100.0	98.2	99.1
[0.90, 0.95]	100.0	98.2	99.1	[0.90, 0.95]	99.8	99.4	99.6	[0.90, 0.95]	99.8	99.0	99.4




OVERALL AVERAGES

Threshold using Geometric Means				Threshold using Intersection of Gaussians				SVM Approach
[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC	[ll, ul]	TP	TN	CC
[0.10, 0.20]	66.8	63.0	64.9	[0.10, 0.20]	72.5	55.9	64.2	[0.10, 0.20]	67.1	71.9	69.5
[0.20, 0.30]	75.3	74.6	74.9	[0.20, 0.30]	81.3	64.6	73.0	[0.20, 0.30]	77.1	79.3	78.2
[0.30, 0.40]	83.7	83.5	83.6	[0.30, 0.40]	88.2	77.7	82.9	[0.30, 0.40]	85.3	85.1	85.2
[0.40, 0.50]	89.3	89.2	89.3	[0.40, 0.50]	91.6	85.9	88.8	[0.40, 0.50]	88.9	92.0	90.5
[0.50, 0.60]	91.8	93.4	92.6	[0.50, 0.60]	94.6	91.6	93.1	[0.50, 0.60]	93.5	94.4	93.9
[0.60, 0.70]	95.0	95.4	95.2	[0.60, 0.70]	96.1	95.0	95.5	[0.60, 0.70]	95.1	96.8	96.0
[0.70, 0.80]	95.7	96.9	96.3	[0.70, 0.80]	96.8	96.9	96.8	[0.70, 0.80]	96.4	97.8	97.1
[0.80, 0.90]	96.0	97.9	97.0	[0.80, 0.90]	97.9	97.6	97.7	[0.80, 0.90]	97.4	98.0	97.7
[0.90, 0.95]	96.2	98.1	97.2	[0.90, 0.95]	98.0	97.4	97.7	[0.90, 0.95]	97.5	98.3	97.9

12/29/15

Detecting Terahertz Signatures Using Guided Under-determined Source Signal Separation

These results correspond to the 18 tests ran for this paper. Two of them (Manzeb and Talc) and the overall averages were included in the manuscript [1].