인터넷 자원기반 문제중심학습이 초등학생의 과학과 학업성취도 및 과학에 대한 태도에 미치는 영향

김진민,이형철 대한지구과학교육학회 2012 대한지구과학교육학회지 Vol.5 No.1

The purpose of this study is to find out the effects of internet resource-based problem-based learning on the academic achievement in science and the attitude toward science of elementary school students. One experiment class and one control class of grade 6 students were selected to perform a prior investigation on the academic achievement in science and the attitude toward science, then the experiment class attended 4 weeks of lessons that was applied the internet resource-based problem-based learning, and the control class attended the traditional lessons based on the guidelines of teachers. After conducting lessons, a post investigation was performed for each class and the results were analyzed to produce the following conclusions. First, the internet resource-based problem-based learning could be seen to be effective in improving the students’ academic achievements in science. The internet resource-based problem-based learning seemed to make students recognize the lesson details better and grasp well the questions given during lessons from the process of finding solutions among many informations and data on the internet. Second, the internet resource-based problem-based learning had a positive effect on all attitudes’ areas toward science of students. It looked like that the internet resource-based problem-based learning taught the students to use the internet resources and gave them a friendly feeling, so the children could actively participate in class and had positive recognition on science. Third, from teacher observation and the result of the student recognition investigation, we could know that the students showed lots of interests in the internet resource-based problem-based learning, and they were able to understand the scientific theories in the process of solving problems that were relevant to real life, and thought science in a positive way.

제품-서비스 통합 성공요인 연구

김진민,왕지영,박광태,김광재,홍유석 대한산업공학회 2009 대한산업공학회 춘계학술대회논문집 Vol.2009 No.5

카고메 격자에서의 높이차 제한이 있는 고체상고체 모형 연구

김진민,박소정,곽우섭 한국물리학회 2018 New Physics: Sae Mulli Vol.68 No.5

We study the restricted solid-on-solid (RSOS) model, one of several many surface growth models, on a kagomé lattice. The RSOS model on a regular lattice is known to be well described by the Kardar-Parisi-Zhang equation. We numerically obtain values of the roughness exponent $\alpha=0.25$, the growth exponent $\beta=0.408$, and the dynamic exponent $z=1.628$, which correspond to the results obtained from the RSOS model on a square lattice. From these results, the values of the critical exponents of the RSOS model in 3 dimensions can be seen to depend only on the dimension, regardless of the type of lattice. Of importance is the observation that this is in contrast with the antiferromagnetic Ising model, which exhibits distinctly different critical phenomena for the kagomé lattice and the square lattice. 표면 성장 (surface growth) 모형 중 하나인 높이차 제한이 있는 고체상고체 (restricted solid-on-solid, RSOS) 모형을 카고메(kagomé) 격자 위에서 전산 시뮬레이션하였다. 보통 격자 위에서 높이차 제한이 있는 고체상고체 모형은 Kardar-Parisi-Zhang 방정식에 의해 잘 기술되는 것으로 알려져 있다. 거칠기 지수(roughness exponent)와 성장 지수(growth exponent), 동력학 지수(dynamic exponent)의 값으로 각각 0.408, 0.25, 1.628을 얻었는데, 이는 사각 격자(square lattice) 위에서 RSOS 모형에서 얻은 결과와 잘 일치하는 값이다. 이를 통해, 3차원에서 RSOS 모형이 격자의 종류와 무관하게 차원에만 의존하는 임계지수값을 갖는다는 것을 알 수 있다. 카고메 격자와 사각 격자에서 확연히 다른 임계 현상을 보여주는 반자성 이징 (antiferromagnetic Ising) 모형과 대조되는 현상임을 주목할 필요가 있다.

대기업과 중소기업의 협력을 위한 성공요인

김진민,박광태 한국기업경영학회 2014 기업경영연구 Vol.21 No.6

Companies need to play various roles as the network of supply chain gradually expands. Companies are required to form a supply chain with outsourcing or partnerships since a company can not perform all functions by itself. There are three types of partnership which are partnership between large firm and large firm, partnership between SME and SME, and partnership between large firm and SMEs. Partnership between large firm and SMEs is getting more important since the power between large firm and SMEs is not well balanced and thus large firm usually has more power than SMEs. This being the case, SMEs become subordinate to large firm and thus this supply chain becomes inefficient and decreases total profit of this supply chain. Each player of the supply chain should cooperatively pursue total profits of supply chain. If a player only pursues its own profit, total profits of the supply chain are actually shrinking. Playing as a team in a supply chain is the most important success factor for the profitable supply chain and thus each player should sacrifice itself for the sake of increasing overall profits of the supply chain. The purpose of this paper is to provide success factors for partnership between large firm and SMEs. We suggest that large firm and SMEs should closely cooperate in terms of five success factors derived in a supply chain consisting of large firm and SMEs. We examined four different cases which are Samsung Electronics Company and Huyndai Motor Company in manufacturing sector, and Hanaro Mart and SK Planet in service sector. We showed five success factors for successful partnership which are information sharing, technology sharing, performance sharing, investment sharing and strategy sharing. The first success factor, information sharing, is implemented in all companies. Information sharing is the fundamental factor for the successful cooperation between large firm and SMEs. As large firm tries to share its R&D and technology information with SMEs, the technical level of the entire supply chain is significantly improved. The efficiency of a supply chain is also improved as large firm shares real-time inventory information with SMEs. The second success factor is technology sharing. Large firm and SMEs in manufacturing industry can jointly develop the new technology and large firm can support SMEs in terms of finance or technology. The productivity of a supply chain is dramatically improved and a new product is successfully launched into the market by the second success factor. The third success factor, performance sharing, is sensitive issue to large firm and SMEs since it is really important issue to share revenue fairly between large firm and SMEs. SMEs usually have difficulties in preparing enough fund to operate and thus it is important for large firm to make payment to SMEs in advance since advance payment really helps SMEs to operate well. The fourth success factor is investment sharing. SMEs usually have difficulty in obtaining enough capital in spite of their excellent technologies. Large firm can help SMEs by offering loans with low interest rate or investing together with SMEs to enter into a new business. The last success factor is strategy sharing. Strategy sharing is an essential part for advancing toward the common target of a supply chain. Large firm and SMEs should understand the strategy of supply chain and establish an efficient network to realize this strategy by mutual understanding and communication. 공급사슬의 네트워크가 점차 확대됨에 따라 기업이 관리해야할 차원이 늘어나면서 하나의 기업이 모든 기능을 수행할 수는 없게 되었다. 이에 현실적으로 기업들은 아웃소싱, 또는 더 나아가 파트너십을 구축한 협력업체와 함께 공급사슬을 구성해야 한다. 본 연구에서는 대기업과 중소기업의 협력관계에 대한 기존사례를 제조업과 서비스업으로 나누어 살펴본 후, 대기업과 중소기업의 협력을 증진할 수 있는 핵심성공요인을 도출하고자 한다. 본 연구에서는 제조업의 삼성전자와 현대자동차, 서비스업의 하나로마트와 SK플래닛의 사례를 분석하여 다섯 가지 공통적인 협력의 성공요인을 도출하였다. 본 연구에서 도출한 다섯 가지 성공요인은 정보의 공유, 기술의 공유, 성과의 공유, 투자의 공유, 그리고 전략의 공유이다. 첫째, 정보의 공유는 모든 기업사례에서 실제로 수행하고 있는 가장 기본적인 내용이다. 사례기업들은 정보의 공유를 통해 관리의 효율성을 증진시키고 중소기업에게 새로운 시장의 기회를 제공하고 있다. 둘째, 기술의 공유에서는 협력기업과 신기술을 함께 개발하고, 신기술개발을 지원함으로써 생산성 향상과 함께 창의적인 신제품을 출시하고 있다. 셋째, 성과의 공유는 사례의 기업들이 모두 대금결제를 앞당겨 중소기업의 자금난을 해소하도록 노력하며, 1차 협력사뿐만 아니라 2,3차 협력사까지 확대하는 노력을 기울이고 있다. 넷째, 투자의 공유의 경우, 뛰어난 기술력을 보유하고 있지만, 초기 투자비용이 부족한 중소기업을 위해 운영자금의 저금리 대출이나 공동투자를 통한 시장 진출 등을 통해 상생할 수 있는 방법을 모색하고 있다. 마지막으로, 전략의 공유는 쌍방향의 원활한 의사소통과 대기업의 전략에 대한 이해 등을 통하여 중소기업들이 대기업과 함께 발전할 수 있는 효율적인 네트워크를 구성할 수 있다. 대기업과 중소기업이 협력의 성과를 향상시키기 위해서는 협력을 위한 성공요인들을 공유하고, 공동의 목표를 함께 지향해야 한다.

Random Walk Diffusion Model with a Restricted Solid-on-Solid Condition in Higher Dimensions

김진민 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.8

We study a random walk diffusion model under the restricted solid-on-solid (RSOS) condition in $d=3+1$ and $d=4+1$ dimensions. A dropped particle is allowed to take a random walk until satisfying the RSOS condition. The surface width $W$ increases as $t^{\beta}$ in early time with $\beta = 0.081 \pm 0.006$ and becomes saturated at $L^{\alpha}$ with $\alpha = 0.29 \pm 0.03$ in $d=3+1$. In $d=4+1$, $W(t)$ grows as $2b \ln t$ at the beginning and becomes saturated at $2a \ln L$. The dynamic exponent $z \approx 3.79$ is obtained from the relation $z= \frac{a}{b}$. This value is slightly less than, but consistent with, the value obtained from the related Langevin equation. Our results imply that the upper critical dimension of the model is $d=4+1$.

Social Commerce Service Quality and Word-of-Mouth Intention: An Application of the Expectation–Disconfirmation Theory

김진민,최석봉 충남대학교 경영경제연구소 2019 경영경제연구 Vol.41 No.4

Social commerce is an attractive market continuing to grow worldwide. As the size of the market is growing, participants are also increasing gradually. As both market entry and exit are free, the social commerce market has become both a new opportunity and another threat for companies. Previous studies found that there is the gap between expectations and perceived performance of social commerce service quality and they have not adequately addressed. We studied the service quality of social commerce based on the expectation–disconfirmation theory. This study examined the relationship among social commerce service quality, customer satisfaction, repurchase intention, and word-of-mouth intention. We also investigated how service quality’s effects on expected customer satisfaction differ from perceived customer satisfaction. We provide an expectation model, a perceived performance model, and the gap model, which is a new approach to analyzing service quality factors that affect the difference between customer expectation and perceived performance. We showed that the results of the expectation model differ from the results of the perceived performance model. We also found that in the gap model, the service quality gap between expectation and perceived performance affects the gap between expected and perceived customer satisfaction.

A Conserved Current Solid-on-Solid Model on a Sierpinski Tetrahedron Substrate

김진민,강대승 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.6

A conserved current solid-on-solid model with conservative noise on a 3D Sierpinski tetrahedron substrate is studied. The interface width W grows as t β , with β = 0.0396 ± 0.0009, and becomes saturated as Lα, with α = 0.195±0.005, where L is the system size. The dynamic exponent z ≈ 4.92 is estimated from the relation z = α/β. These values satisfy a scaling relation α+z = 2z rw , where z rw is the random walk exponent of the fractal substrate. Our results are consistent with the values estimated from a fractional Langevin equation with a conservative noise.

장거리 통신망에서 음성반향제거기의 설계

김진민,김대성,최정고,류근택,배현덕 ( Jin Min Kim,Dae Sung Kim,Jung Go Choe,Geun Teak Ryu,Hyeon Deok Bae ) 충북대학교 산업과학기술연구소 1995 산업과학기술연구 논문집 Vol.9 No.1

Fluctuation of the Waiting Time for the Restricted Solid-on-Solid Growth Model in d = 2 + 1

김진민 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.9

We study the fluctuation of the waiting time in the restricted solid-on-solid growth model. The waiting time (x, h) is defined as the Monte Carlo time for the surface at position x to reach height h. In contrast to the discrete height h(x, t), (x, h) is a continuous parameter following the Kardar-Parisi-Zhang equation with a different sign of the nonlinear term. In d = 2+1, the variance W2 (h) of (x, h) grows as h2 with = 0.249 ± 0.004 (from L = 16384) and saturates at L2 with 0.398±0.005, where L is the system size. The measured exponents satisfied the scaling relation + = 2.0 very well. Our result shows that is consistent with 1/4.

무작위 포텐셜 상에서 3 + 1 차원에 대한 방향성 폴리머

김진민 한국물리학회 2019 New Physics: Sae Mulli Vol.69 No.11

We have studied a directed polymer in random media on d = 3+1. The standard deviation ΔE(t) of the minimum energy E(t) of the polymer increases as t for the polymer length t and becomes saturated at ΔE(L), where L is the system size. Using the relations ΔE(t) t and ΔE(L) L, = 0:191 0:006 and = 0:324 0:008 are obtained. The end-to-end distance ΔX(t) of the polymer is monitored as a function of t and z = 1:696 0:009 is obtained independently through the relation ΔX(t) t1/z. It is consistent with the value of z estimated from the relation z = /. The relation + z = 2 is satisfied very well. We also measured the skewness and the kurtosis of the energy distribution. They are in good agreement with the results of the restricted solid-on-solid model. Thus, the normalized energy distribution should be universal even in d = 3 + 1. 무작위 포텐셜을 갖는 방향성 폴리머를 3+1차원에서 연구하였다. 폴리머의 최저 에너지 E(t) 의 표준편차 ΔE(t)는 시간 t에 대하여 t 로 성장하며 시스템 크기가 L일때 포화상태에서 ΔE(L) L 를 따른다. 우리는 = 0:191 0:006; = 0:324 0:008을 d = 3 + 1에서 구하였다. 폴리머의 끝간거리 ΔX(t)를구하여 관계식 ΔX(t) t1/z 를 이용하여 동역학 지수 z = 1:6960:009를 직접적으로 결정하였다. 이는z = / 관계식으로부터 측정한 값과 일치한다. 지수들은 축척 관계식 + z = 2를 잘 만족한다. 또한에너지분포의 skewness와 kurtosis를 측정하여 이산 제한적 고체상 고체 모델에 대한 결과와 잘 일치함을확인하였다. 따라서 재규격화된 에너지 분포는 3 + 1 차원에서도 보편성 부류를 따른다.