The Korean Astronomical Society (KAS) Education & Public Outreach Committee has provided education services for children and school teachers in Cambodia over the past three years from 2016 to 2018. In the first year, 2016, one KAS member visited Pusat to teach astronomy to about 50 children, and in the following two years of 2017 and 2018, three and six KAS members, respectively, executed education workshops for ∼ 20 (per each year) local school teachers in Sisophon. It turned out that it is desirable to include both teaching of astronomical knowledge and making experiments and observations in the education in order for the program to be more effective. Language barrier was the main obstacle in conveying concepts and knowledge, and having a good interpreter was very important. It happens that some languages, such as the Khmer of Cambodia, do not have astronomical terminologies, so that lecturers and even the education participants together are needed to communicate and create appropriate words. Handout hardcopies of the education materials (presentation files, lecture/experiment summaries, terminologies, etc.) are extremely helpful for the participants. Actual performing of assembling and using astronomical telescopes for night sky observations has been lifetime experience for some of the participants, which might promote zeal for knowledge and education. It is hoped that these education services for developing countries like Cambodia can be regularly continued in the future, and further extended to other countries such as Laos and Myanmar.

The present experimental study investigates single-phase heat transfer coefficients downstream of support grid in 6×6 rod bundles. Support grid with Split mixing vanes enhance heat transfer in rod bundles by generating turbulence but this turbulence is confined to a short distance. Support grid with large scale vortex flow(LSVF) mixing vanes enhanced heat transfer to a longer distance. In this study, the experiments were performed at reynolds numbers of 50,000. The characteristics of the heat transfer enhancement of the Split mixing vane and those of the LSVF mixing vane were compared. The results showed that the characteristics of the heat transfer enhancement of rods by the Split mixing vane were limited to 10 Dh after the spacer grid, but those by the LSVF mixing vane were maintained until 15 Dh after the spacer grid. For the reynolds number of 50,000, the heat transfer enhancement effect was 3.0% greater when using the LSVF mixing vane than when using the Split mixing vane between the 1 ∼ 15 Dh interval after the spacer grid.

게임에 대한 인식이 점차 그 유용성을 인정하는 쪽으로 변화 하면서 교육용 게임의 시장이 크게 성장하고 있다. 하지만 아직까지도 교육용 게임은 다른 장르의 게임에 비해 많이 활성화 되지 못하고 있는 것이 현실이다. 따라서 본 연구에서는 교육용 게임의 몰입에 영향을 미치는 요인들을 분석해보고 궁극적으로 게임 개발을 위해 어떠한 요인들이 초점을 맞추어야 할 것인가에 대한 방향을 제시 하고자 하며 향후 교육용 게임에 관한 연구 및 교육용 게임 산업에 도움이 되고자 한다. 본 연구의 결과 다음과 같은 결론을 확인하였다. 첫째, 교육용게임의 몰입에 있어 교육적 효과, 시나리오, 보상은 긍정적인 영향을 미친다. 특히 감정적 몰입에는 교육적 효과와 보상이, 계산적 몰입에는 교육적 효과와 시나리오가 긍정적인 영향을 미친다. 둘째, 그래픽, 조작성은 교육용 게임의 몰입에 미치는 영향력을 확인하지 못하였다. 셋째, 교육용 게임에서 난이도가 너무 어려우면 감정적 몰입을 하는데 어려움을 준다.

This study aims to examine the development process of the early stone pagodas of Unified Silla. The history of stone pagodas traces back to both Baekje and Silla in the Three Kingdoms period, but the styles and structures of pagodas began differently. In other words, Baekje attempted to recreate the wooden pagoda style, while Silla attempted to recreate China' brick pagoda style. These different stone pagoda cultures, around the unification of Three Kingdoms, underwent new style changes, and after the mid-7th century, some changes in the five-storied stone pagodas in Tapri appeared, and the milestone perfection of Silla's stone pagodas was achieved through those of Gameusa Temple and Goseonsa Temple. After the mid-7th century, Silla's stone pagodas accommodated some of Baekje's wooden pagodas' elements, shifted from the wooden pagoda style and developed into its own stone pagoda style. This is shown in numerous stone pagodas. However, in Silla's stone pagodas, including the three-storied stone pagoda in Hwagboksa Temple in 692, the size of the pagoda became small and underwent sudden changes. In other words, a new direction of Silla stone pagodas was presented in terms of how massive stones could be reduced, but they differed only in the reduced stone amount; the basic developed style of the Gameunsa Temple stone pagoda and the Goseonsa Temple stone pagoda inherited the traditional style. Thus, the construction of these two pagodas is considered to be significant in the Silla's history of stone pagodas.

The purpose of these study was to find out the effect of sports counselling program for a juvenile delinquent students. So, on the subject of three advises, we studied on detailed fields including mental stability, responsibility, prudence, self-esteem, v

The purpose of these study was to find out the effect of sports counselling program for a juvenile delinquent students. So, on the subject of three advises, we studied on detailed fields including mental stability, responsibility, prudence, self-esteem, v

국내 하천특성은 기후변화에 의한 계절별 기후변동성과 급속한 경제성장으로 인한 급격한 토지피복의 변화에 의하여 영향을 받아왔다. 이와 관련하여, 하천관리는 수자원이용 등 인간의 활동 뿐 아니라 생태계측면에서도 그 중요성이 커지고 있다. 하천관리의 첫 번째 단계인 직접유출과 기저유출을 포함한 하천특성을 이해하는 것은 지속적인 하천환경을 조성하기 위하여 지대한 기여를 할 수 있다. 그러므로 본 연구의 목적은 효율적인 하천관리를 위해 직접유출과 기저유출을 정량화하여 하천에 미치는 기여도를 산정하는 것이다. 이를 위하여 한강수계에 위치한 71개의 유량관측소에 대하여 BFLOW와 WHAT 프로그램을 이용하여 기저유출 분리를 수행하였다. 그 결과 한강수계의 기저유출비는 0.42에서 0.78의 범위를 가지며, 기저유출비가 50%를 넘는 관측소는 전체 관측소의 76%를 차지하였다. 그러나 산출된 기저유출비는 댐, 저수지, 호수로부터의 방류량과 같은 인위적 영향 때문에 과다산정 되었을 가능성이 있다. 본 연구는 추후 국가적 차원에서 하천관리의 효율성과 안전성을 개선하기 위하여 전략적으로 하천 기능을 조절하는데 기여를 할 것으로 기대한다.