비규격 스틸커튼월 부재의 적용을 위한 로봇 레이저용접 성능에 관한 연구

나상호 ( Na¸ Sangho ),이장현 ( Lee¸ Janghyun ),박영미 ( Park¸ Youngmi ),김성진 ( Kim¸ Sungjin ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2

In irregular curtain walls, the nominal stress required for each member varies greatly depending on the shape, so it is inefficient to design members based on the maximum required stress. Then, built-up members are absolutely necessary, but built-up members manufactured by Manpower-welding cannot be constructed in an irregular curtain wall building because it' not precise. In order to address the problems, this paper presents why Robotic-laser-welding should be used in irregular curtain walls using Gwanggyo Galleria Department Store involving 3D printing as an example. Results verify the performance of Robot-Laser-Welding as an efficient solution for precise steel curtain wall members.

플래시 메모리를 위한 파일 시스템의 구현

박상호(Sangho Park),안우현(Woo Hyun Ahn),박대연(Daeyeon Park),김정기(Jeong-Ki Kim),박승민(Sung-Min Park) 한국정보과학회 2001 정보과학회 컴퓨팅의 실제 논문지 Vol.7 No.5

플래시 메모리는 기존의 회전식 자기 매체에 비해서 속도가 빠르고, 충격에 강한 장점이 있다. 이런 특성으로 인해 기존의 가전, 통신 기기, 휴대 기기에서 저장매체로써 플래시 메모리의 사용이 증대하고 있고, 더불어 저장 매체로 플래시 메모리를 사용한 파일 시스템의 필요성도 증가하고 있다. 저장 매체로써 플래시 메모리는 위와 같은 장점 외에 두 가지 문제점을 가지고 있다. 첫째, 데이타를 덧쓸 수가 없다는 점이다. 데이타를 덧쓰기 위해서는 데이타를 저장하기 전에 플래시 메모리를 지워야 하는데, 지우는 작업은 1초 정도의 시간이 소요된다. 따라서, 플래시 메모리에 저장된 데이타를 수정할 때, 시간이 오래 걸리게 되는데, 본 논문에서는 기존의 LFS(Log-structured File System) 방식으로 데이타를 저장하여 이와 같은 문제점을 해결하였다. 플래시 메모리의 두 번째 문제점은 수명이 제한되어 있다는 점이다. 본 논문에서는 cleaning policy 를 통하여 수명을 최대한 연장시킬 수 있도록 하였다. 본 논문에서 구현한 플래시 파일 시스템은 소용량 저장매체에 적합한 FAT를 사용하여 성능을 향상시켰고, FAT를 구현할 때 발생할 수 있는 문제점을 해결하였다. 또한, 차례 쓰기, 무작위 쓰기의 실험을 통해서 성능을 분석하였다. Advantages of flash memories are their shock resistance and fast read speed, which is much faster than that of a HDD. Because of these characteristics, they are increasingly used in the traditional household electric appliance and portable handset and ,therefore, development of file systems which use them as storage medium is increasingly needed. But they have two problems as storage medium. First, data stored in them cannot be overwritten: it must be erased before new data can be stored. Unfortunately, this erase operation usually takes about one second. Consequently, updating data in flash memories takes long time. In this paper, their problem is solved by using a data update mechanism like LFS(Log-structured File System). Second, their erase operations are restricted. We propose novel cleaning policy in order to increase the life cycle. We implemented FAT file system, which is suitable to small storage medium and solved problems, which usually happen in implementing FAT. We evaluated the performance of sequential writes and random writes on our implemented flash file system.

Roles of Inflammatory Biomarkers in Exhaled Breath Condensates in Respiratory Clinical Fields

Hye Jung Park, M.D., Ph.D.,Yong Jun Choi, M.D.,Min Jae Lee, M.D.,Min Kwang Byun, M.D., Ph.D.,Sangho Park, B.S.,Jimyung Park, M.D., Ph.D.,Dongil Park, M.D., Ph.D.,Sang-Hoon Kim, M.D., Ph.D.,Young Sam K 대한결핵및호흡기학회 2024 Tuberculosis and Respiratory Diseases Vol.87 No.1

Background: Exhaled condensates contain inflammatory biomarkers; however, theirroles in the clinical field have been under-investigated. Methods: We prospectively enrolled subjects admitted to pulmonology clinics. Wecollected exhaled breath condensates (EBC) and analysed the levels of six and 12biomarkers using conventional and multiplex enzyme-linked immunosorbent assay, respectively. Results: Among the 123 subjects, healthy controls constituted the largest group (81participants; 65.9%), followed by the preserved ratio impaired spirometry group (21patients; 17.1%) and the chronic obstructive pulmonary disease (COPD) group (21patients; 17.1%). In COPD patients, platelet derived growth factor-AA exhibited strongpositive correlations with COPD assessment test (ρ=0.5926, p=0.0423) and COPD-specificversion of St. George’s Respiratory Questionnaire (SGRQ-C) score (total, ρ=0.6725,p=0.0166; activity, ρ=0.7176, p=0.0086; and impacts, ρ=0.6151, p=0.0333). GranzymeB showed strong positive correlations with SGRQ-C score (symptoms, ρ=0.6078,p=0.0360; and impacts, ρ=0.6007, p=0.0389). Interleukin 6 exhibited a strong positivecorrelation with SGRQ-C score (activity, ρ=0.4671, p=0.0378). The absolute serum eosinophiland basophil counts showed positive correlations with pro-collagen I alpha 1(ρ=0.6735, p=0.0164 and ρ=0.6295, p=0.0283, respectively). In healthy subjects, forcedexpiratory volume in 1 second (FEV1)/forced vital capacity demonstrated significantcorrelation with CC chemokine ligand 3 (CCL3)/macrophage inflammatory protein 1alpha (ρ=0.3897 and p=0.0068). FEV1 exhibited significant correlation with CCL11/eotaxin(ρ=0.4445 and p=0.0017). Conclusion: Inflammatory biomarkers in EBC might be useful to predict quality of lifeconcerning respiratory symptoms and serologic markers. Further studies are needed.

Policy Consulting for Strengthening Uganda’s National STI System and Establishment of STI Parks (Ⅱ) – Policy Capacity-building Program

Deok Soon Yim,Elly Hyanghee Lee,Jong-in Choi,Jong Heung Park,Sangho Choi,Hansung Yoon,Maxwell Otim Onapa,Basil Ajer,Monica Rose Nyakaisiki,Bashir Rajab Kagere,Geoffrey Sempiri 과학기술정책연구원 2019 조사연구 Vol.- No.-

Group I mGluR-dependent depotentiation in the lateral amygdala does not require the removal of calcium-permeable AMPA receptors

Park, Kyungjoon,Song, Sukwoon,Hong, Ingie,Song, Beomjong,Kim, Jeongyeon,Park, Sungmo,Lee, Junuk,Song, Sangho,An, Bobae,Kim, Jihye,Lee, C. Justin,Shin, Ki Soon,Choi, Sukwoo,Lee, Sukwon Frontiers Media S.A. 2014 Frontiers in Behavioral Neuroscience Vol.8 No.-

<P>There is conflicting evidence regarding whether calcium-permeable receptors are removed during group I mGluR-mediated synaptic depression. In support of this hypothesis, AMPAR rectification, a correlative index of the synaptic expression of GluA2-lacking calcium–permeable AMPARs (CP-AMPARs), is known to decrease after the induction of several types of group I mGluR-mediated long-term depression (LTD), suggesting that a significant proportion of synaptic CP-AMPARs is removed during synaptic depression. We have previously demonstrated that fear conditioning-induced synaptic potentiation in the lateral amygdala is reversed by group 1 mGluR-mediated depotentiation. Here, we examined whether CP-AMPARs are removed by mGluR1-mediated depotentiation of fear conditioning-induced synaptic potentiation. The synaptic expression of CP-AMPARs was negligible before, increased significantly 12 h after, and returned to baseline 48 h after fear conditioning, as evidenced by the changes in the sensitivity of lateral amygdala synaptic responses to NASPM. Importantly, the sensitivity to NASPM was not altered after induction of depotentiation. Our findings, together with previous results, suggest that the removal of CP-AMPARs is not required for the depotentiation of fear conditioning-induced synaptic potentiation at lateral amygdala synapses.</P>

<i>Physalis peruviana</i> L. inhibits ovalbumin-induced airway inflammation by attenuating the activation of NF-κB and inflammatory molecules

Park, Hyun Ah,Kwon, Ok-Kyoung,Ryu, Hyung Won,Min, Jae-Hong,Park, Min-Woo,Park, Mi-Hyeong,Paik, Jin-Hyub,Choi, Sangho,Paryanto, Imam,Yuniato, Prasetyawan,Oh, Sei-Ryang,Ahn, Kyung-Seop,Lee, Jae-Won D.A. Spandidos 2019 International journal of molecular medicine Vol.43 No.4

<P><I>Physalis peruviana</I> L. (PP) is well known for its various properties, including its antioxidant property. In our previous study, the protective effects of PP against cigarette smoke-induced airway inflammation were confirmed. The purpose of the present study was to evaluate the anti-inflammatory effect of PP against ovalbumin (OVA)-induced airway inflammation. Treatment with PP inhibited the numbers of eosinophils and the levels of inflammatory cytokines, including interleukin (IL)-4, IL-5 and IL-13, in the bronchoalveolar lavage fluid (BALF) of animal models with OVA-induced allergic asthma. PP also significantly decreased the production of total immunoglobulin E in the serum. Lung sections stained with hematoxylin and eosin revealed that the influx of inflammatory cells was decreased in the lungs of mice treated with PP compared with cells in the OVA group. The increased expression levels of monocyte chemoattractant protein-1 (MCP-1) and T cell marker KEN-5 were also reduced following PP treatment in the lung tissues compared with those in the OVA group. The PAS staining results showed that PP attenuated the overproduction of mucus in the lung. Additionally, western blot analysis revealed that PP significantly downregulated the activation of nuclear factor-κB/p38 mitogen-activated protein kinase/c-Jun N-terminal kinase, and upregulated the expression of heme oxgenase-1 in the lungs. In an <I>in vitro</I> experiment, PP effectively reduced the levels of LPS-stimulated MCP-1 in a concentration-dependent manner. Taken together, these results indicate that PP has considerable potential in the treatment of allergic asthma.</P>

The Effects of Different SQUAT Loading on Lower Extremity Movement Pattern and Stability Index during Squat Exercise Between Trained versus Un-Trained Individuals

Sangho Park,Changyoung Kim J-INSTITUTE 2021 Kinesiology Vol.6 No.4

Purpose: Weight training is a training method that can effectively increase muscle strength and anaerobic exercise capacity. The muscles of the lower extremities, which have been trained through lower body exercises, are a particularly important group of muscles for daily physical and sporting activities. The purpose of this study was to investigate the difference squat loading of the lower extremity joints movement pattern between trained versus un-trained individuals. Method: A total of 20 physically healthy individuals 10 trained subjects(age: 28.71±2.41 yrs, height: 178.92± 4.25 cm, weight: 81.72±4.98 kg) and 10 un-trained subjects(age: 29.42±3.67 yrs, height: 176.62±3.8 cm, weight: 80.2±5.11 kg) participated in this study. The un-trained subjects who had not performed regular resistance exer-cise for at least the past 1 year, and had no experience performing squat movements were selected. The trained group was selected as subjects who had regularly performed resistance strength training for at least 3 years. The three-dimensional motion analysis system, force plate and an wireless electromyography system were synchro-nized and used for measurement. Results: The results of this study showed that there was difference between the trained group and the un-trained group and the trained group showed the pattern of knee varus and un-trained group showed the valgus angle(Knee valgus) displacement. Also, Statistically significant differences appeared in knee forward movement and the trained group(5cm) showed less than the un-trained group(11cm). In the case of MLSI(Medial-Lateral Stability Index), the untrained group showed a higher stability index than the trained group. It was found that the stability index of the trained and untrained groups increased as the body weight increased. Conclusion: The purpose of this study was to investigate the effect of various squat loads on lower extremity movement patterns and stability index during squat exercise between trained and untrained individuals. The subjects of the study were 10 trainees who regularly squat for 3 years and 10 non-trainers who practiced squats irregularly throughout their lives. As a result of the experiment, it was confirmed that the untrained group had greater knee forward movement and a smaller hip flexion angle than the trained group. In the stability index, it was confirmed that the untrained group showed a higher stability index than the trained group. In future studies, it is considered necessary to study the improvement of squat motion in untrained individuals. It is important to check for changes in movement patterns after training.

버스 시트 설계를 위한 EMG실험

Sangho Park,Jinghu Piao,Tae su Yim,Jun feng Sun,Se jin Park,Murali Subramaniyam,Yeon ju Oh 대한인간공학회 2012 대한인간공학회 학술대회논문집 Vol.2012 No.5

Comparison of tree-based ensemble models for regression

Park, Sangho,Kim, Chanmin The Korean Statistical Society 2022 Communications for statistical applications and me Vol.29 No.5

When multiple classifications and regression trees are combined, tree-based ensemble models, such as random forest (RF) and Bayesian additive regression trees (BART), are produced. We compare the model structures and performances of various ensemble models for regression settings in this study. RF learns bootstrapped samples and selects a splitting variable from predictors gathered at each node. The BART model is specified as the sum of trees and is calculated using the Bayesian backfitting algorithm. Throughout the extensive simulation studies, the strengths and drawbacks of the two methods in the presence of missing data, high-dimensional data, or highly correlated data are investigated. In the presence of missing data, BART performs well in general, whereas RF provides adequate coverage. The BART outperforms in high dimensional, highly correlated data. However, in all of the scenarios considered, the RF has a shorter computation time. The performance of the two methods is also compared using two real data sets that represent the aforementioned situations, and the same conclusion is reached.

Study on the Changes in Enzyme and Insulin-like Growth Factor-1 Concentrations in Blood Serum and Growth Characteristics of Velvet Antler during the Antler Growth Period in Sika Deer (Cervus nippon)

Park, Jaehyun,Jeon, Byongtae,Kang, Sungki,Oh, Mirae,Kim, Myonghwa,Jang, Seyoung,Park, Pyojam,Kim, Sangwoo,Moon, Sangho Asian Australasian Association of Animal Productio 2015 Animal Bioscience Vol.28 No.9

This study was conducted to investigate changes in blood enzyme parameters and to evaluate the relationship between insulin-like growth factor-1 (IGF-1), antler growth and body weight during the antler growth of sika deer (Cervus nippon). Serum enzyme activity and IGF-1 concentrations were measured in blood samples collected from the jugular and femoral veins at regular intervals during the antler growth period. Blood samples were taken in the morning from fasted stags (n = 12) which were healthy and showed no clinical signs of disease. Alfalfa was available ad libitum and concentrates were given at 1% of body weight to all stags. The experimental diet was provided at 9 am with water available at all times. There were no significant differences in alkaline phosphatase, aspartate aminotransferase, and alanine aminotransferase during antler growth, but alkaline phosphatase concentrations increased with antler growth progression, and the highest alkaline phosphatase concentration was obtained 55 days after antler casting. Serum IGF-1 concentrations measured from blood samples taken from the jugular vein during antler growth, determined that levels of IGF-1 was associated with body weight and antler growth patterns. Serum IGF-1 concentrations were higher at the antler cutting date than other sampling dates. Antler length increased significantly during antler growth (p<0.001), and there was a similar trend to between right and left beams. Body weight increased with antler growth but was not significant. Consequently it appeared that serum alkaline phosphatase concentration was related to antler growth and both antler growth and body weight were associated positively with IGF-1 concentrations during antler growth.