【求助】求助一个词的中文意思

Jack-knifing
The previous discussion on dataset bias has ignored the important distinction between measures of self-consistency and true measures of prediction accuracy. The method has been traditionally implemented so that the centroids are calculated once with the whole dataset and predictions are then made for each member of the dataset. This only produces a measure of self consistency. We have implemented full jack-knifing (also known as leave-one-out cross-validation) into the method so that the class centroids contain no information from the sequence being predicted. The results obtained with the jack-knifed implementation for the full 3-class 1996 CATH database are shown in Table 3.1 (Result 7); the overall accuracy is 57% (worse by all measures than the non-jack-knifed Result 5). As dataset size increases, the need for jack-knifing is diminished because the information is diluted in the calculation of the centroids (data not shown). However, the results which follow are all jack-knifed.
是关于数据交叉验证还是关于设备的，你的上下文是什么？

jack·knife (jknf)
n.
1. A large clasp knife.
2. Sports A dive in the pike position, in which the diver straightens out to enter the water hands first.
v. jack·knifed, jack·knif·ing, jack·knifes
v.tr.
1. To fold or double (something or oneself) like a jackknife.
2. To cut or stab with a jackknife.
v.intr.
1. To bend or fold up like a jackknife: A truck that had jackknifed was blocking the road.
2. To form a 90° angle.

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jackknife
Verb
[-knifing, -knifed]
(of an articulated lorry) to go out of control in such a way that the trailer swings round at a sharp angle to the cab
Noun
pl -knives
1. a knife with a blade that can be folded into the handle
2. a dive in which the diver bends at the waist in midair
ThesaurusLegend: Synonyms Related Words Antonyms
Noun 1. jackknife - a large knife with one or more folding blades
clasp knife
pocket knife, pocketknife - a knife with a blade that folds into the handle; suitable for carrying in the pocket
2. jackknife - a dive in which the diver bends to touch the ankles before straightening out
dive, diving - a headlong plunge into water
Verb 1. jackknife - dive into the water bending the body at the waist at a right angle, like a jackknife
athletics, sport - an active diversion requiring physical exertion and competition
dive - plunge into water; "I was afraid to dive from the board into the pool"

Translations
jackknife [ˈdʒæknaɪf] n → couteau m de poche
vi the lorry jackknifed → la remorque (du camion) s'est mise en travers
这是字典的意思，意思是叉形刀或象叉刀一样的弯曲折叠90度

这个是文章的摘要，这个词还是全文的关键词
The aim of this study was to evaluate the potential use of near infrared reflectance (NIR) spectroscopy to predict the nutritive value of high moisture grain corn (HMC). Additionally the use of the jack-knifing as a method to reduce redundant wavelengths was explored when the calibration models were developed.
The coefficient of determination in calibration (R2 CAL) and the standard error in cross validation (SECV) were (R2 CAL= 0.90, SECV: 2.6%) for dry matter, (R2CAL = 0.85, SECV: 0.52%) for crude protein, (R2CAL= 0.90,SECV: 1.8%) for acid detergent fibre, (ADF), (R2CAL= 0.91, SECV: 2.0%) for in vitro organic matter digestibility(OMD), (R2
CAL= 0.84, SECV: 0.33%) for ash, (R2CAL= 0.91, SECV: 0.3%) for pH and (R2CAL= 0.90, SECV:1.07%) for ammonia nitrogen (N),respectively. The results fromthis study suggested that dry matter, acid
detergent fibre and in vitro organic matter digestibility were accurately predicted using NIR spectroscopy in HMC samples. The use of the jack-knifing method improved the calibration models obtained.

Additionally the use of the jack-knifing as a method to reduce redundant wavelengths was explored when the calibration models were developed.
这里应该是交叉验证方法，减少一些冗余波长的一种方法。高水分玉米中有关一些养分和成分的分析，其中有一个是酸性洗涤纤维。