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이창한 한국경찰연구학회 2013 한국경찰연구 Vol.12 No.4
본 연구는 외출제한명령대상자의 재범 예측 요인을 도출하는데 있다. 외출제한명령은 재범위험성이 높은 소년 보호관찰대상자들의 생활양식이 주로 야간에 이루어지고, 소년범죄에서 다발하는 범죄들이 주로 사회의 감시가 소홀한 특정 시간대에 집중되는 것에 대한 보호관찰당국의 적절한 재범방지책 중의 하나이다. 분석자료의 모집단은 2004년부터 2011년 10월까지 보호관찰정보시스템(K-PIS)에 입력되어 있는 모든 외출제한명령대상자 44,637명이다. 모집단은 2006년부터 2010년까지 5년에 걸쳐 매년 100명을 무작위로 표집 한 500명 중 자료가 충실하게 입력된 450명을 분석대상이 되었다. 분석결과에 따르면, 외출제한명령대상자에 대한 재범률은 8.0%였다. 그리고, 외출제한명령기간 중 재범여부에 영향을 미치고 있었던 것은 보호관찰경력, 경고횟수, 음성감독기간 등이었다. 또한, 외출제한명령이 개시된 이후, 대상자가 새로운 범죄를 저지르는데 까지 걸리는 시간에서 보호관찰경력, 경고횟수, 음성감독기간 이외 성폭력사범 여부가 통계적으로 유의미한 영향을 미쳤다.
Anisotropic surface model in two substrate dimensions
이창한,Jin Min Kim 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.32
We introduce an anisotropic equilibrium surface model which has a restricted solid-on-olid condition in the y-direction and a restricted curvature condition in the x-direction. There are three dierent regimes: W(t) t1 for t < L2, W(t) t2 for L2 < t < L4 and W(L) L for t L4. The surface width in the y-direction shows that the roughness exponent rsos is near 1=4, but the surface width for the x-direction indicates that the roughness exponent is near 0:95. A possible continuum equation for the model is also discussed.
Depinning Transition of the Quenched Kardar-Parisi-Zhang Equation
이창한,Jin Min Kim 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
We study the pinning-depinning transition of the Kardar-Parisi-Zhang equation with quenched noise. We integrate the equation numerically and apply the ¯nite-size scaling method to determine the critical exponents more accurately. At the critical force, the surface width W shows a scaling W(L; t) » Lf(t=Lz) with = 0:633(8), ¯ = 0:647(2), and z ¼ 0:978, where L is the system size. Near the critical force, the steady-state velocity vs follows vs » (F ¡ Fc)µ with µ = 0:616(9). We ¯nd various other critical exponents related to the depinning transition through the ¯nite-size scaling formulas of the velocity v. There are three independent exponents , ¯, and µ, and the other critical exponents are determined through them.
Restricted Curvature Model with Suppression in d=2+1
이창한,Jin Min Kim 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.32
We study a restricted curvature model with suppression of extremal height in two substrate dimensions. In our model, the surface width W shows the roughness exponent 0:65 and the dynamics exponent z 2:76 in two substrate dimensions. is close to but slightly less than 2/3. However, the correlation function has an unusual scaling behavior and produces a dierent wandering exponent 0 0:95 and its dynamic exponent z0 4:04. We nd = =0 0:68, which is slightly larger than 2/3.
$CO_2$ 용접에서 스패터 발생에 미치는 지연시간 제어의 영향
이창한,김희진,강봉용 대한용접접합학회 1999 대한용접·접합학회지 Vol.17 No.5
For the last two decades, waveform control techniques have been successively developed and applied for the inverter welding machines resulting in the substantial reduction of spatter generated in CO₂ welding. One of the constituents commonly involved in those techniques is to delay the instant of current increase to some extent after the initiation of short-circuiting. Although this technique has been known to be quite effective in reducing the spatter generation through the suppression of is instantaneous short circuiting, the delay time necessary for minimum spatter has not been clearly understood. In this study, the control system for varying the delay time was constructed so that the spatter generation rates could be measured over a wide range of delay time, 0.29-2.0 msec. As a result of this study, it was demonstrated that spatter generation rate(SGR) sharply decreased at delay time of 0.6 msec and longer accompanied with the change in characteristics of short circuit mode from the instantaneous short-circuiting(ISC) dominant to normal short-circuiting(NSC) dominant. Another feature that have been found in current waveform of over 0.6msec was the creation of current pulse right after the arc reignition stage. Because of this current pulses weld pool oscillated in wave-like fashion and it looks like to play an important role in developing short circuiting between electrode and weld pool.