• Transactions on Control, Automation and Systems Engineering
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• v.1 no.1
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• pp.69-74
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• 1999

Adaptive algorithms based on gradient adaptation have been extensively investigated and successfully joined with active noise/vibration control applications. The Filtered-X LMS algorithm became one of the basic feedforward algorithms in such applications, but is not fully understood yet. Effects of cancellation path model on the Filtered-X LMS algorithm have investigated and some useful properties related to stability were discovered. Most of the results stated that the error in the cancellation path model is undesirable to the Filtered X LMS. However, we started convergence analysis of Filtered-X LMS based on the assumption that erroneous model does not always degrade its performance. In this paper, we present a way of optimizing the cancellation path modern in order to enhance the convergence speed by introducing intentional phase error. Carefully designed intentional phase error enhances the convergence speed of the Filtered X LMS algorithm for pure tone noise suppression application without any performance loss at steady state.

• Journal of The Korean Society of Clinical Toxicology
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• v.8 no.1
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• pp.46-49
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• 2010

"Stacker 3" is one of the most popular caffeine-containing weight-reduction supplements and it has ephedra-free properties as "Stacker 2 Ephedra-Free" in many countries, including Korea. We describe here a 26-year-old woman who took an acute intentional overdose of "Stacker 3"(approximately 50 capsules, total amount: 25 grams, as caffeine 250 mg/kg) and who had delirium, rhabdomyolysis and acute renal failure. She had to be treated by forced diuresis and urine alkalinization, and she subsequently recovered. This is the first such case report in the medical literature.

• Journal of Navigation and Port Research
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• v.34 no.2
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• pp.97-103
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• 2010

It has been recognized that the risk from the vulnerability of GPS can lead to the extreme damage in the infrastructure of the civil and military in recent years. As an example, the intentional interference to GPS signal, named GPS jamming, was really performed to misguide GPS guided weapons during Iraq war in 2003, and the fact has also followed by the serious issues on GPS in civilian community. In the modernized military society, the navigation warfare(NAVWAR) based on the GPS jamming has been emerged and introduced as a military operation. The intentional interference to the future global navigation satellite system(GNSS) involving GPS must be also an important issue to civilian users in near future. This study is focused on the fundamental research prior to the research on "Potential principle of NAVWAR" under NAVWAR of the future warfare. In this paper, we would study on the investigation of NAVWAR based on electronic warfare(EW) and analyze characteristics of the jamming against GNSS's receivers. Then the general mechanism on GNSS jamming is proposed.

• Journal of the Korea Institute of Military Science and Technology
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• v.13 no.1
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• pp.133-139
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• 2010

GNSS receiver which uses the weak satellite signal is very vulnerable to the intentional jamming or non-intentional electromagnetic interference. It is a very simple method among the use method of GNSS receiver to vary tracking loop bandwidth of satellite signal appropriately as the jamming signal level. In this paper, this anti-jamming performance is experimented and analyzed in the laboratory and the anechoic chamber by the GNSS simulator to generate the satellite signal and the jamming signal generator to generate the jamming signal.

• Proceedings of the ESK Conference
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• 1996.04a
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• pp.36-47
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• 1996

By integrating the eye head-position monitioring devices, the present authors developed an eye-controlled human/computer interface based on the line-of-sight and an intentional blink to invoke commands. Also modified was an existing calibration method to reduce the visual angle between the target center and the intersection point of the derived line-of-sight. This modified calibration method allowed 108 or more command blocks to be displayed on the 14 inch monitor with the target acquisition probability(hit rate) of 98% when viewed at the distance of 500 mm apart. An active triggering method using an intentional blink was proposed and was shown to be a feasible and efficient alternative to invoke commands with total triggering time of 0.8 sec or less. The system could be used by the normal people as well as the handicapped individuals as a new human/computer interface.

• Journal of Korea Multimedia Society
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• v.25 no.9
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• pp.1284-1290
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• 2022

An attacker with a malicious purpose can intentionally type other users' accounts and passwords, causing them to be locked or revoked. Although NIST introduced methods to prevent this attack, all suggested methods are inappropriate to prevent an attacker from manually failing authentication, and reduce user availability. In this paper, in order to prevent user account lockout due to an attacker's intentional authentication failure, we propose a new authentication method using IP address and number of failed authentication. The proposed method not only blocks attackers who intentionally try to fail authentication, but also provides convenience to users because accounts are not locked or revoked. It can also safely protect passwords against password cracking attacks.

• The Journal of the Korean dental association
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• v.38 no.3 s.370
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• pp.280-287
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• 2000

• 전기의세계
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• v.41 no.1
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• pp.23-34
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• 1992

일반적으로 전자파 노이즈는 발생원인에 따라 2가지로 대별되는데, 태양 노이즈와 낙뢰 등으로 대표되는 자연노이즈(Natural Noise)와 통신, 방송, 전자기기 등과 같은 인공노이즈(Man-Made Noise)가 있다. 인공노이즈는 다시 의도성노이즈(Intentional Noise)와 비의도성노이즈(Unintentional Noise)로 분류된다.

• Proceedings of the KACD Conference
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• 2007.11a
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• pp.626-626
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• 2007

• Journal of The Korean Society of Clinical Toxicology
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• v.6 no.1
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• pp.16-24
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• 2008

Purpose: There has been no nationwide surveillance survey of poisoning cases in Korea. This study examined the clinical characteristics of poisoning admissions in order to obtain preliminary data for future planning. Methods: This study retrospectively reviewed the data on poisoning admissions of 150 hospitals based on the hospital discharge injury surveillance data of Center for Disease Control and Prevention in Korea from January to December in 2004. The demographic data, poisons used, causes of poisoning, reasons for attempted suicide and mortality rate was investigated according to the age group. The factors associated with mortality were also evaluated. Results: A total 836 patients admitted for poisoning were analyzed. Their mean age was $46.5{\pm}19.5$ years (male 415, female 421). The most frequent age group was the 4th and 5th decades. The most common poisons involved were pesticides (45%) and medications (23%). The majority (64%) involved intentional poisoning except for those in the 1st decade. The most common reason for the attempted suicide was family problems. However, individual disease was the most common reason in those over 60 years. The overall mortality rate was 8.7% (73/836). Pesticides and being elderly (over 65 years old) were strongly correlated with fatality. Conclusion: The incidence of intentional poisoning increases from the 2nd decade making it a preventable injury. "Overall, the incidence of intentional poisoning increases from the 2nd decade". Therefore, there is a need to frame a prevention policy corresponding to each factor related to fatality, such as an elderly population and pesticides.