NiTiZrSiSn bulk metallic glass powder was produced using inert gas atomization and then was sprayed onto a SS 41 mild steel substrate using the kinetic spraying process. Through this study, the effects of thermal energy of in-flight particle and crystallization degree by powder preheating temperature were evaluated. The deformation behavior of bulk metallic glass is very interesting and it is largely dependent on the temperature. The crystalline phase formation at impact interface was dependent on the in-flight particle temperature. In addition, variations in the impact behavior need to be considered at high strain rate and in-flight particle temperature.

다양한 분야에서 방사선물질을 수송하기 위해 사용되고 있는 수송용기(cask)는 국내 원자력안전규정 및 IAEA 운반규정에서 정한 9m 자유낙하충격의 가상사고조건을 만족시켜야 된다. 현재까지 수송용기의 낙하충격력은 주로 복잡한 계산과정을 갖는 유한요소해석에 의해 수행되어 왔다. 본 논문에서는 수송용기 본체의 동적충격응답에 대해 모드중첩기법을 이용하여 해석하고 그 해법방법을 제시하였다. 해석결과는 이전에 실시되었던 시험결과와 유한요소해석과 비교를 통하여 그 타당성을 입증하였다. 본 해석방법은 유한요소 해석과 비교하여 간단한 방법으로서 수송용기에 대한 대체적인 동적응답을 예측할 수 있다.

The purposes of this study are to analyze economic effect of prison labor on free market economy and to suggest ways for more effective prison labor industry. The impact of prison labor on non-prison labor has been debated over the years. Proponents have touted the social benefits of decreased net cost of prisons, improved behavior in prison, the potential for low recidivism, and rehabilitation through development of work and social skills. Opponents of prison labor from the beginning have pointed out the private costs of lost jobs and lost sales of industries outside the prison. Although it is very difficult to measure and compare quantitatively benefits and costs of prison labor, there is inverse relationship between prison labor and recidivism rates. According to Federal Bureau of Justice, inmates involved in prison labor has better chance to be employed and to receive higher wage. In addition, the revenue from prison work can pay for the costs of housing them in prison and prison labor leads to increased production of goods and services that can help in developing regional economy. In spite of the advantages of prison labor, it is argued that prisoners work is exploitative and it will displace civilian business and labor. These concerns put in place as the size and scope of prison labor expands and motivate legislative efforts in restricting prison labor. To improve quality of prison labor, the Bureau of Prisons needs to allow more private companies to employ prisoners at reasonable wage and to cultivate useful skills. Moreover, the operation body and methods of correctional work program should be reformed and specialized. It is recommended to consider establishment of special organization that concentrates in operating prison labor industry. Finally, it is suggested to benefits of prison labor should be measured and publicized to ensure quality of correctional work program.

방사성물질은 다양한 분야에서 사용되고 있으며 이에 따른 국내 및 국제간 운반이 계속적으로 증가하고 있다. 방사성물질을 수송하기 위해서는 수송용기의 안전성이 확보되어야 한다. 방사성물질 수송용기의 안전규정에 관해서는 국내 원자력법 운반안전규정 및 IAEA 운반규정에서 규정하고 있다. 방사성물질 수송용기 중에서 사용후핵연료를 운반하는 수송용기는 본체와 충격완충제로 구성되어 있다. 본 논문에서는 사용후핵연료 수송용기의 충격완충제에 작용하는 충격력을 계산하는 간편한 실험식을 차원해석을 통하여 유도하였다. 해석결과는 기존의 충격면적법 및 유한요소해석과 비교를 통하여 그 타당성을 입증하였다. 본 실험식을 이용하여 수송용기의 낙하충격력을 쉽게 예측할 수 있다.

미 연방대법원은 중앙관리형 서버가 존재하지 않는 P2P 소프트웨어의 온라인 배포와 관련하여 인터넷 파일공유 서비스기업인 그록스터 등에게 저작권의 간접침해 책임이 성립한다는 취지의 판결을 선고하였다. 판결 요지는“저작권을 침해하는 제품의 사용을 장려할 목적으로 배포한 자는, 제3자의 행위를 알고서 단지 배포한 것을 넘어서, 당해 침해를 촉진하기 위하여 행하여진 명확한 표현 또는 그밖의 긍정적인 행동이 증명된 경우, 그 제품의 합법적인 사용에도 불구하고 그 제품을 사용하는 제3자에 의해 야기된 침해행위에 대하여 책임을 진다.”는 것이다. 이러한 그록스터 판결은 P2P 기술 그 자체를 문제삼은 것이 아니라 “침해적 사용을 예견하였을 뿐만 아니라 광고 등을 통하여 유발한 ”적극적유인행위에 초점을 맞춘 것으로 이해될 수 있을 것이다. 그러므로 우리는 문화산업과 기술산업 양쪽의 창작과 발전을 존중하고 보호하고자 한 것으로 그록스터 판결을 파악하는 것이 중요하다. 따라서 이 판결이 문화환경에 미친 영향을 고려하면서 문화와 기술 양 영역에 있어서 비즈니스 모델의 변화를 모색하는 노력이 또한 필요하게 될 것이다.

The purposes of this study were to determine the effects of rehabilitation programs on functional performance of the lower extremities and whether additional therapeutic exercise with routine rehabilitative therapy improves functional performance more than just routine rehabilitative therapy by it self for inpatients who have suffered a stroke with below moderate severity within 3 to 6 months after the onset of the stroke. Fifty-eight subjects were divided into two groups. Group I was given routine rehabilitative therapy and group II was given additional therapeutic exercise along with the routine rehabilitative therapy. Each group received 6 weeks of rehabilitation. The timed get-up and go test (TUG), the Fugl-Meyer score (FMS), functional independence measure (FIM), functional reach (FR), gait velocity (GV), and the strength of knee extensor and flexor were selected to measure effect of rehabilitation programs. The main results were measured and analysed at baseline, 3 weeks, and 6 weeks after the start of the rehabilitation programs. The results revealed that all of functional performance of the lower extremities in 3 weeks after the start of the rehabilitation programs were significantly improved compared with before the rehabilitation programs in both groups. In 6 weeks, TUG, FIM, FR, GV, and the strength of knee extensor in group I, TUG, FMS, FIM, FR, GV, and the strength of knee extensor and flexor in group II were significantly improved compared with the results after 3 weeks. At 3 weeks after rehabilitation programs, group II made significantly greater gains in TUG, FR, GV, and the strength of the knee flexor compared to the group I. At 6 weeks, group II made significantly greater gains in TUG, FR, GV, and the strength of the knee extensor and flexor compared to the group I. In conclusion, rehabilitation programs for stroke patients within 3 to 6 months after stroke onset significantly contributed to improve functional performance of the lower extremities. It is desirable for improvement of functional performance of the lower extremities to perform additional exercise with routine rehabilitative therapy.

방사선물질을 수송하기 위한 용기는 가상 사고조건에서도 안전해야만 한다. 운반용기 설계요구조건은 실험 및 유한요소 해석을 통해 구조적 건전성을 확보하여야 한다. 최근에는 실험보다 유한요소해석을 이용한 방법이 상대적으로 비용이 적기 때문에 주로 사용된다. 그러나 기계적인 반응이 복잡하기 때문에 프로그램을 적용하는 사용자의 방법에 의해 결과가 결정되고 해석하는 동안 여러가지 문제를 발생시킬 수 있다. 본 논문에서, 유한요소해석은 LS-DYNA3D와 ABAQUS/Explicit을 이용하여 운반용기의 9m 자유낙하충격실험에 대한 해석기술과 여러가지 손상을 갖는 경우를 발견하기 위해 연구하였다. 운반용기의 각각의 경우를 비교하고 사용후 핵연료 운반용기의 낙하 실험에 대해서 신뢰할 수 있는 비교적 간단한 해석 기술을 제안하였다.

The purpose of this study is to propose guidelines for introducing the Just-In-Time (JIT) production system to enhance the competitiveness of Korean manufacturing companies. This study employed an extensive survey on the use of the JIT production systems

The main goal of this work is to study the effects of temperature and volume fraction of fiber on the Charpy impact test with GF/PP composites. The critical fracture energy and failure mechanisms of GF/PP composites are investigated in the temperature range of 60℃ to -50℃ by impact test. The critical fracture energy increased as the fiber volume fraction ratio increased. The critical fracture energy shows a maximum at ambient temperature and it tends to decreases as temperature goes up or goes down. Major failure mechanisms can be classified such as fiber matrix debonding, fiber pull-out and/or delamination and matrix deformation.

This paper describes to evaluate the performance of ventilation as a change of CO2 concentration with ventilation rate under 35 occupants in a school classroom. Variations of the CO2 concentration as a function of time are measured at center point of classroom with air ventilation rates by the CO2 gas monitor. For 800 m3/h of ventilation rate in the classroom, the average CO2 concentration is 913 ppm. The ventilation rate is sufficient to meet acceptable indoor air quality (≤ 1,000 ppm of CO2, KS school standard) in the classroom of 35 students.