• 대한산업공학회지
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• 제22권3호
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• pp.337-349
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• 1996

A study was conducted to find the possible relationship between slip distance and dynamic coefficient of friction (DCOF) through the biomechanical study of slips and falls using a broader variety of floors and levels of slipperiness than those used before. Four different floor surfaces covering the full range of floor slipperiness (with and without on oil contaminant) were prepared for ten subjects with each walking at a fixed velocity. The results showed that slip distance and heel velocity had a decreasing trend while stride length had a increasing trend as DCOF increased. The contaminant effect overpowered floor slipperiness effect because a higher DCOF surface with oil contaminant created longer slip distance than the lower DCOF with dry floor. Normal gait pattern and suggested heel velocity (10 to 20 cm/sec) were seen on dry floors but abnormally longer stride length and 5 to 10 times faster heel velocity were found an oily floors. In other words, faster heel velocity (greater than 10 to 20 cm/sec) is recommended to measure DCOF on oily floors because the assumption of normal gait was no longer valid.

• Structural Engineering and Mechanics
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• 제34권5호
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• pp.563-580
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• 2010

Composite beams using bolts to attach steel plates to the side faces of existing reinforced concrete (RC) coupling beams can enhance both their strength and deformability. The behavior of those composite beams differs substantially from the behavior of typical composite beams made up of steel beams and concrete slabs. The former are subjected to longitudinal, vertical and rotational slips, while the latter only involve longitudinal slip. In this study, a mixed analysis method was adopted to develop the fundamental equations for accurate prediction of the load-carrying capacity of steel plate strengthened RC coupling beams. Then, a rigid plastic analysis technique was used to cope with the full composite effect of the bolt group connections. Two theoretical models for the determination of the strength of medium-length plate strengthened coupling beams based on mixed analysis and rigid plastic methods are presented. The strength of the strengthened coupling beams is derived. The vertical and longitudinal slips of the steel plates and the shear strength of the anchor-bolt connection group is considered. The theoretical models are validated by the available experimental results presented in a companion paper. The strength of the specimens predicted from the mixed analysis model is found to be in good agreement with that from the experimental results.

• 대한전기학회논문지:시스템및제어부문D
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• 제50권2호
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• pp.72-79
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• 2001

In the GPS/DR integrated system, the GPS position(or velocity) is used to compensate the DR output and to calibrate errors of the DR sensor. This synergistic relationship ensures that the calibrated DR accuracy can be maintained even when the GPS signal is blocked. Because of the observability problem, however, the DR sensors are not sufficiently calibrated when the vehicle speed is low. This problem can be solved if we use a multi-antenna GPS receiver for attitude determination instead of conventional one. This paper designs a two-antenna GP receiver integrated with DR sensors. The proposed integration system has three remarkable features. First, the DR sensor can be calibrated regardless of the vehicle speed with the aid of two-antenna GPS receiver. Secondly, the search space of integer ambiguities in GPS carrier-phase measurements is reduced to a part of the surface of the sphere using DR heading. Thirdly, the detection resolution of cycle-slips in GPS carrier-phase measurements is improved with the aid of DR heading. From the experimental result, it is shown that the search space is drastically reduced to about 3/20 of the non-aided case and the cycle-slips of 1 or half cycle can be detected.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2004년도 Korea-Russia Joint Conference on Geometics
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• pp.82-94
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• 2004

This paper addresses solutions to the challenges of carrier phase integer ambiguity resolution and cycle slip detection/identification, for maintaining high accuracy of an integrated GPS/Pseudolite/INS system. Such a hybrid positioning and navigation system is an augmentation of standard GPS/INS systems in localized areas. To achieve the goal of high accuracy, the carrier phase measurements with correctly estimated integer ambiguities must be utilized to update the system integration filter's states. The occurrence of a cycle slip that is undetected is, however, can significantly degrade the filter's performance. This contribution presents an effective approach to increase the reliability and speed of integer ambiguity resolution through using pseudolite and INS measurements, with special emphasis on reducing the ambiguity search space. In addition, an algorithm which can effectively detect and correct the cycle slips is described as well. The algorithm utilizes additional position information provided by the INS, and applies a statistical technique known as the cumulative-sum (CUSUM) test that is very sensitive to abrupt changes of mean values. Results of simulation studies and field tests indicate that the algorithms are performed pretty well, so that the accuracy and performance of the integrated system can be maintained, even if cycle slips exist in the raw GPS measurements.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.19-20
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• 2021

Although various laws and regulations have been put in place to prevent slips and falls, many accidents still occur. In this study, the root cause of slips and falls not decreasing were investigated. There are five types of slip resistance test methods in the Korean Industrial Standards (KS). Namely, KS F 2375:2016, KS F 2601:2020, KS F 2602:2016, KS L 1001:2020, and KS G 5821-1:2020 are listed. These test methods are cited in building certification standards (BF and G-SEED), construction specifications, and other documents that specify slip safety criteria. As a result of the investigation, a number of errors in KS regulations and legal text, errors in the manufacture and operation of slip testers, and errors in the use of measured values were found. These errors threaten the public life safety and disrupt industrial sites, and must be corrected immediately.

• Anatomy and Cell Biology
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• 제56권3호
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• pp.328-333
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• 2023

The first extensor compartment of the wrist is a distinctly variable anatomical area. Anatomical variations in this region contribute to the pathophysiology and treatment failure of de Quervain's disease, which is a kind of tenosynovitis that develops in the first extensor compartment of the wrist. We aim to describe the first extensor compartment morphology, to evaluate the septum frequency, location of the septum, and the number of tendons of abductor pollicis longus (APL) and extensor pollicis brevis muscles (EPB). First extensor compartment of 87 wrists of 45 cadavers were dissected. The presence or absence of septum and number of tendon slips of APL and EPB revealed. The proximal and distal widths of the compartments were measured. Septums were detected in 60.9% (n=53) of the wrists. Incomplete (distal) and complete (proximal) septa were present in 35.6% (n=31) and 25.3% (n=22) of the cases. Only 26.4% of the wrists had a single slip of APL tendon. The Remaining had multiple slips. The median inner width of the proximal and distal compartments in all wrists were calculated as in the order of 9.11±1.14 mm and 8.55±1.12 mm. We believe that understanding the anatomy of the first extensor compartment in the Turkish population would be helpful to surgeons, radiologists, and physiotherapists to diagnose and manage de Quervain's disease.

• 한국철학논집
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• 제30호
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• pp.161-190
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• 2010

상해박초간 "주역"에는 지금까지의 "주역" 텍스트에서는 찾아볼 수 없었던 적색과 흑색의 특수부호가 존재한다. 상해박초간 주역을 처음 정리한 복모좌(?茅左)는 이 부호를 " ▧, ?, ■,?,?, ⊏"의 6종류로 나누고 음양사상을 도입하여 설명한다. 이상신(李尙信)은 이 부호를 7종으로 나눈 후 이 부호를 통해 상해박초간 "주역"의 괘서(卦序)는 현행본 "주역"의 괘서와 완전히 일치하며 역시 음양사상을 담고 있다고 한다. 하함이(夏含夷)(Edward L. Shaughnessy)는 죽간의 물질적 상태를 분석하여 상해박초간 "주역"의 괘서와 현행본 "주역"의 괘서는 동일할 것이라고 추측한다. 근등호지(近藤浩之)(Kondo Hiroyuki)는 부호를 9종류로 나누어서 상해박초간의 괘서를 도출한 후, 상해박초간본의 괘서는 괘획 단위로 고안되었기 때문에 6효(爻)로 이루어지는 대성괘(大成卦)를 문제로 삼고 있고, 3효(爻)로 이루어지는 소성괘(小成卦)의 조합법은 고려되고 있지 않다고 한다. 이와 같은 여러 견해에는 모두 장단점이 있지만 아래의 두 가지 점은 공통된다. 첫째로 상해박초간 "주역"의 괘의 배열은 현행본과 매우 유사하다는 점. 둘째로 형식대립적 상반괘는 같은 부호를 사용한다는 점이다. 이 두 점으로부터 상해박초간 "주역"이 8괘 시스템을 기초로 만들어지지 않았다는 것을 추론해 낼 수 있다. 상해박초간 "주역"의 부호 체계는 8괘(卦) 시스템이 아닌 64괘(卦)(64 trigrams) 시스템을 상정할 때 가능한데 이는 일반적으로 인정받는 통설, 즉 8괘가 64괘보다 먼저 이루어졌다는 것에 대해 재검토를 요구한다. 출토자료와 문헌자료를 통해 8괘와 64괘의 성립 관계를 살펴보면 8괘 체계의 "주역"이 선행하여 존재하였고, 후에 64괘 체계의 "주역"이 등장하였다고 보기 힘들며 "주역"은 아마도 성립초기부터 64괘 체계였으리라고 생각된다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1994년도 추계학술대회 논문집
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• pp.157-164
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• 1994

Finite element analysis of material deformation is successfully utilized to understand metal forming processes such as forging, extrusion and deep drawing. However, such analysis involves contact problems; a free node touches a die surface and a contact node slips along the die surface. In the present investigation, appropriate contact algorithms were developed assuming that a three dimensional surface can be divided into bilinear patches and that nodal velocities are linear during an incremental time. The algorithms were coded into a computer program and tested for a simple surface. Comparison of the test result with that obtained from a commercial code is presented and discussed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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• pp.379-382
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• 1988

In this paper optimal light source arraies are calculated to reduce slips in RTA process. A two-channel temperature controller is constructed on a board using IBM - XT to improve the temperature uniformity. The proposed RTA structure has also advantage of power dissipation.

• 한국정보과학회 언어공학연구회:학술대회논문집(한글 및 한국어 정보처리)
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• 한국정보과학회언어공학연구회 1991년도 제3회 한글 및 한국어정보처리 학술대회
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• pp.139-146
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• 1991

한글 필기행동에서 나타나는 실수들을 분석하였다. 단어이하의 수준에서 오철(spelling error)와 오기(slips of the pen)가 관찰되었다. 오철은 부분적인 철자지식에 기인하는 것으로, 음소를 철자로 변환하는 과정에 영향을 받는 것임을 시사하는 사례가 발견되었다. 오기에는 지속 예기 생략 등이 있었으며, 철자정보를 운동패턴으로 변환하는 과정에서 나타나는 것 같았다. 또한 획과 관련된 실수들도 발견되었다. 전반적으로 필기과정에는 발음관련정보의 영향이 큰 것을 부정할 수 없었다.