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상대습도에 따른 농산물 포장용 골판지의 원지의 물리적 특성 변화 및 상자압축강도의 예측
조중연,신준섭,김종경 한국포장학회 2005 한국포장학회지 Vol.11 No.2
Determination of safety factor of corrugated fiberboard boxes used for agricultural products is very complicated process due to nature of living products. Moisture content is one of the most critical factors to determine overall physical strength of paper, so its influences on strength properties of corrugated board made from different raw materials must be quantified. The results obtained from the study were summarized as follows; 1. Results show a detrimental effect on bursting strength and compressive strength of liners with increasing relative humidity of environment and moisture content of liners. 2. The relevance of equilibrium moisture content at varying relative humidity levels was proved and its relationship was used as an important factor to estimate box compression strength. 3. Test results was statistically used for establish the relationship between relative humidity and moisture content of liners. Estimated compression strength of boxes at varying moisture content was similar to results of theoretical equations such as Kellicutt`s. Further study could be carried out in order to determine a optimum safety factors of various corrugated board boxes for agricultural products.
자동차용 에어필터의 재생 처리법 개발 및 포장원지 제조
조중연,신준섭 한국포장학회 2005 한국포장학회지 Vol.11 No.1
This study was carried out for effective utilization of recycling resources to investigate the repulping conditions of car air filter waste paper and to evaluate the application into corrugating medium papermaking by blending these repulped pulps. Car air filter waste paper was made of virgin BKP and it was dipped into phenol resin solution. It was well disintegrated by laboratory Valley beater with 10%(basis on oven-dried pulp weight) NaOH addition and defoamer usage. The optimal temperature, beating consistency and treatment time were mainly 40℃, 1% and $30{\sim}40$ minutes, respectively. Handsheets were prepared with various blending ratios between air filter recycled pulp and KOCC. In the case of 10~20% substitution with air filter recycled pulp, physical properties reductions as compressive strength and burst strength of sheets were lower than others. These results showed more favour than the partial substitution of KOCC for corrugating medium even though some strength reduction of paper. It was also observed that the waste water of air filter recycling was not affective to environmental problems.
매니코어 시스템을 위한 MPI 노드 내 통신 프리미티브 성능 비교
조중연,진현욱 한국정보과학회 2019 정보과학회 컴퓨팅의 실제 논문지 Vol.25 No.7
The memory-mapping-based mechanism designed for intra-node communication of MPI programming model can perform intra-node communication with single data copy. There has been an increase in the ratio of intra-node communication in MPI programming model due to the development of the manycore system. It is expected that improvement in MPI intra-node communication performance in the manycore system can be achieved by understanding the characteristics and mitigating overhead of communication primitives for memory-mapping-based mechanism. In this paper, we compare latency and receiver side overhead of point-to-point communication and broadcast collective communication using LiMIC, CMA, and XPMEM which communication primitive for memory-mapping-based mechanism. Based on the results it is clear that XPMEM exhibits up to 7.4 times higher latency compared to LiMIC and CMA in case of point-to-point communication and XPMEM exhibits up to 3.8 times higher latency compared to LiMIC and CMA in case of broadcast collective communication. MPI 프로그래밍 모델의 노드 내 통신을 위해 고안된 메모리 매핑 방법은 한차례의 데이터 복사만으로 노드 내 통신을 수행할 수 있다. 매니코어 시스템의 발전에 따라 MPI 프로그래밍 모델의 노드 내 통신 비율이 증가하고 있어 메모리 매핑 방법을 위한 통신 프리미티브들의 특징을 이해하고 병목지점을 완화한다면 매니코어 시스템에서 MPI 노드 내 통신 성능 향상이 기대된다. 본 논문에서는 메모리 매핑 방법을 위한 통신 프리미티브인 LiMIC, CMA, XPMEM을 이용해 점대점 통신 및 브로드캐스트 집합 통신 유형의 지연시간과 수신 측 단계별 오버헤드를 비교한다. 실험 결과 점대점 통신 유형의 경우 XPMEM이 LiMIC 및 CMA와 비교했을 때 최대 7.4배 높은 지연시간을 보이며, 브로드캐스트 집합 통신 유형의 경우 XPMEM이 LiMIC 및 CMA와 비교했을 때 최대 3.8배 높은 지연시간을 보인다.
실내 및 실외 축구 서킷 프로그램이 신체조성, 면역글로블린에 미치는 영향
조중연,김동영 한국스포츠학회 2017 한국스포츠학회지 Vol.15 No.4
This study is designed to implement the indoor and outdoor soccer circuit training program in order to suggest the effective soccer program in enhancing the body composition and immunoglobulin and find out the necessity. The training was conducted in three sessions during 12weeks and the groups were divided into two groups of indoor group and outdoor group. In the strength of the exercise for each group, the strength was set using the METs value of VO2max 60∼70%. In the indoor and outdoor circuit training program in winter time, the analysis has been made on how the soccer circuit training program has effect on the body composition and immonoglobulin. First, among the item of body composition depending on the group and the training period, the changes in the weight, body mass index and muscle did not make the significant change in the interaction in the exercise treatment and the group but they made a significant difference depending on the period(p<.001). But the fat mass among the items of body composition did not show significant difference depending on the period of exercise and interaction but it made a significant difference depending on group(p<.01). Second, it was found that the exercise treatment did not make the significant change in the change in IgA, IgG depending on the type of group and the period of exercise but the exercise treatment makes the significant difference on the period(p<.01) and group(p<.05) in IgD. But in the interaction, there was no significant difference. The exercise did not show the significant change in IgM in terms of period and interaction but it showed the significant difference in group(p<.01). IgE in terms of interaction and group but it showed the significant difference in period(p<.05). 본 연구는 실내 및 실외 축구 서킷 프로그램을 수행하여 신체조성, 면역글로블린의 향상에 효율적인 축구 프로그램을 제시하고자 하였다. 12주간 주 3회 실시하였으며 그룹은 실내, 실외 두 그룹으로 각 그룹별 운동 강도는 측정된 참여자의 개인별 VO2max를 토대로 VO2max 60∼70%의 METs값을 적용하여 운동 강도를 설정하였고 겨울철 실내 및 실외에서 축구 서킷프로그램을 통하여 분석하였다. 첫째, 그룹과 운동기간에 따른 신체조성 항목 중 체중, 체질량지수, 근육량의 변화는 상호작용과 그룹에서는 유의한 차이가 나타나지 않았으나 기간(p<.001)에서는 유의한 차이가 나타났다. 그러나 체지방량은 기간과 상호작용에서 유의한 차이가 나타나지 않았으나 그룹(p<.01)에서 유의한 차이가 나타났다. 둘째, 그룹, 운동기간에 따른 IgA, IgG의 변화는 유의한 차이가 나타나지 않았고, IgD는 상호작용을 제외한 기간(p<.01)과 그룹(p<.05)에서 유의한 차이가 나타났다. IgM은 그룹(p<.01)에서, IgE는 운동 기간(p<.05)에서 유의한 차이가 나타났다.