Print Unit Research Articles

Latent print comparison and examiner conclusions: A field analysis of case processing in one crime laboratory

Scholarship on the latent print comparison process has expanded in recent years, responsive to the call for rigorous research by scholarly groups (e.g., National Academy of Sciences, 2009; President’s Council of Advisors on Science and Technology, 2016). Important to the task of ultimately improving accuracy, consistency, and efficiency in the field is understanding different workflows and case outcomes. The current study describes the casework completed by a latent print unit in a large laboratory during one calendar year (2018), including a unique workflow that involves Preliminary AFIS Associations reported out as investigative leads. Approximately 45% of all examined prints were deemed to be of sufficient quality to enter into AFIS, and 22% of AFIS entries resulted in potential identifications. But examiner conclusions and AFIS outcomes (across three AFIS databases) varied according to case details, print source, and AFIS database. Moreover, examiners differed in case processing, sufficiency determinations, and AFIS conclusions. Results are discussed with respect to implications for future research (e.g., comparing these data to case processing data for other laboratories) and ultimately improving the practice of latent print examination.

Analysis of synthetic cannabinoids on paper before and after processing for latent print using DFO and ninhydrin

There have been several cases in the news regarding the presence of synthetic cannabinoids on paper being smuggled into jails and prisons in the United States. The Allegheny County Office of the Medical Examiner has been involved in the analysis of multiple cases. For the first time the laboratory received an analysis request for not only identification of controlled substances, but also for the presence of latent fingerprints. It was unknown if the processing methods used by the latent print unit would interfere with the identification of the controlled substances. This paper shows that DFO and ninhydrin processing will remove some of the synthetic cannabinoids, possibly effecting concentration on the paper, but the substances were still able to be positively identified after processing.

PENENTUAN KOMPONEN KRITIS UNTUK MENGOPTIMALKAN KEANDALAN MESIN CETAK

Equipment maintenance activities are very important in the operation of a system or equipment in the industry. With the maintenance strategy and methods that can affect the occurrence of damage resulting in equipment can operate in the long term. The methods used are Reliability Centered Maintenance (RCM) data required are working hours data, corrective time data, Supply Delay Time (SDT) and Administrative Delay Time (ADT) data, and prevetive maintenance data. To determine whether the data obtained suadah match, then used the exponential distribution, from the form of the data then it can be found treatment. From the exponential distribution will get the value of cumulative function, machine reliability, Maen Time Batwen Failure (MTBF), Mean Time Battery Maintenance (MTBM), machine readiness time (availability) for each machine. There are two critical components: laker / bearing and felt print. From the data processing obtained reliability of printing machine unit 1 99.9%, machine unit 2 92.52%, unit 3 91.85% machine. for that we need preventive maintenance. In addition to the reliability also obtained MTBM as a schedule of preventive maintenance on mesn print unit 1 66.105, unit 2 93.037 machine, machine unit 3 106,893 hours once.Keywords: Reliability, RCM, Preventive Maintenance

Strategic Planning Information System for Improving Quality of Datu Sanggul Hospital in Rantau

Datu Sanggul Hospital as one of the institutions engaged in health, has made information technology and information systems as part of business processes that accompany the business trip. Conditions that require unit Management Information System and Medical Record (SIM & RM) to always accompany the institution to be not optimal when the blue print unit SIM & RM service has not been integrated with other units in the planning. This research will make SI / IT strategic plan needed by Datu Sanggul Hospital in Rantau for the current year 2018 to 2022. This research refers to the current condition of SI / TI and analyzed using several approaches to support the process of formulation of strategies that suit the needs. This research was built using Ward & Peppard method. The research step begins by using some analysis such as value chain, five forces, PEST until it can be mapped the position of hospital with SWOT analysis. The Datu Sanggul hospital position was in quadrant IV which applied strength-Threat strategy. Determination of future needs is done by using a balanced scorecard approach to find the appropriate Critical Success Factor needs. Until finally the formulation of the strategy of SI, IT, and IT management to form the portfolio of future applications in the form of 8 new applications, 1 application upgrade and 1 application replace, reliable human resources needed, build cloud computing and standardize governance with Cobit 4.1 and Documentation through ISO 9001: 2008 which is a support for blueprint service for SIM & RM units for 2014 - 2018. The results of this strategic planning will provide direction to management for policy making involving investment, implementation and education required

Ink-lift-off during offset printing: a novel mechanism behind ink–paper coating adhesion failure

This paper reports on a special pilot coating and industrial printing trial designed to gain fundamental knowledge on ink adhesion failure on coated papers. We found that ink adhesion failure resulted in white spots without ink on the paper, referred to as uncovered areas and these spots gave print mottle problems. The white spots were due to two fundamentally different types of ink adhesion failure. One is the well-known ink rejection, which simply means that ink is not transferred to the surface. The other is a new type of ink adhesion failure, confirming a previous hypothesis suggested from laboratory observations. We refer to this as ink-lift-off adhesion failure, meaning that ink initially deposited on the paper surface becomes lifted off from the surface in a subsequent print unit. Adhesion failure by this mechanism was seen to occur more frequently than failure due to the well-known ink rejection.

A Report of Statistics from Latent Print Casework

ABSTRACTStatistics were derived from casework from the Minnesota Bureau of Criminal Apprehension Latent Print Unit. These data represented a portion of the latent print casework completed in the 2003/2004 calendar years (N = 673 cases) and 2009/2010 calendar years (N = 885 cases). The 2003/2004 data revealed latent print recovery rates from various exhibits. Identifiable latent prints were recovered 13% of the time on firearms, 13% of the time on plastic bags, and no identifiable latent prints were recovered from fired or unfired ammunition. The processing of evidence prior to submission to the laboratory increased the chances of latent print recovery. Both data sets were explored for the rate at which identifiable latent prints were reported (61% of cases in 2003/2004 and 54% of cases in 2009/2010) and the rate at which identifiable latent prints were subsequently identified to an individual in the case (23% of cases in 2003/2004 and 25% of cases in 2009/2010). There was no noticeable difference for the ...

Modeling Print Registration in Roll-to-Roll Printing Presses

Roll-to-roll (R2R) printing is a continuous process in which thin flexible materials such as paper are passed through a printing press to print the required pattern onto the material. Each printing press may have several printing units depending on the number of colors to be printed and the complexity of the pattern. The flexible material, often referred to as a “web,” is passed successively through each print unit to create a multicolor pattern. Print registration is the process of overlapping successive printed patterns to form a complex multicolor pattern and the registration error is the position misalignment in the overlapped patterns. This paper develops a machine direction print registration model in a printing press with multiple print units whose print cylinders are driven using mechanical line shafts. The registration model considers the effects of interaction between adjacent print units due to variations in material strain and machine dynamics, including various dynamic elements, such as the print cylinder, doctor blade assembly, print unit compensator roller, print unit motor, friction at various locations, etc. Measured data from typical production runs on an industrial printing press are used to corroborate the developed print registration model. Mechanical design and control design recommendations to reduce registration error in print units are also provided. The developed registration model is applicable to many R2R printing technologies, such as offset, flexo, and rotogravure printing.

Effects of Delayed Irregular Feedback on Unskilled and Skilled Keying Performance*

Five experiments are reported which assessed the effect on unskilled and skillod keying performance of delaying by a small and irregular amount tho activation of the print unit attached to a teletype keyboard. The first three experiments involving unskilled subjocts showed: a significant decrease in the speed of performance; tho persistence of tho impairment over extended testing; and the occurrence of the effect even when a modified transcription task permitted faster keying. The remaining experiments involving skilled subjects showed: a decrease in the speod of performance; an association of the impairment with an increase in the longer interrosponse times; the elimination of tho effect after an initial exposure to tho delay. Those experimental outcomes are not consistent either with the open-loop or the closed-loop hypothesis of keying performance suggested by theories of motor learning. A modified version of each hypothesis is proposed, tormod ’ adaptation ’ and ’ substitution ’ respectively. Both modified hypotheses are consistent with the overall effects of delay. Further examination of the data, however, suggests that’ substitution ’ is more consistent with the results reported for unskilled subjects and ’ adaptation ’ nioro consistent with the results for skilled subjects.

The chronocord Mk III a portable recording crystal chronometer

The Chronocord is a portable crystal chronometer combined with a printing chronograph, which includes a means of taking time signals even through considerable noise. The whole instrument is contained in one case about 1 foot cube, weighing 19 lbs and operated from 12 V d.c. The print unit may be removed and replaced with one of the following: (i) a nickel-cadmium battery unit to keep the chronometer operating while being man-packed, (ii) a manual display unit, (iii) a counter unit for calibrating the crystals of a Tellurometer.