Impact Analysis of BIM Spread on Mechanical Design Process Based on Consciousness Survey among Japanese Mechanical Engineers

Hiyama, Kyosuke,Diao, Yunting,Kato, Shisuke,Koganei, Makoto Council on Tall Building and Urban Habitat Korea 2013 International journal of high-rise buildings Vol.2 No.2

Recently, the demand for Building Information Modeling (BIM) construction drawings and specifications has increased rapidly. Many countries have also started to implement BIM. The BIM implementation can change the design flow of buildings including high-rise buildings. Against this background, many companies are focusing on the development of BIM software. BIM involves a three-dimensional CAD program that can examine the placement of ductwork and machinery. It significantly increases the efficiency of a mechanical design through data unification using standard Industry Foundation Classes (IFC). In addition, BIM functions as a database to simplify the use of simulation technology for designing air-conditioning systems. To further develop BIM, it is important to know the expectations of mechanical engineers who will become frequent users of BIM in the future. A survey was conducted among Japanese mechanical engineers using a questionnaire to analyze the expectations of mechanical design using BIM. The results show that many respondents strongly recognize BIM as a three-dimensional CAD program. However they also expect that BIM can help the optimization of their design works and enhance design functionality by running simulations utilizing BIM.

Accuracy of Percutaneous Pedicle Screw Placement after Single-Position versus Dual-Position Insertion for Lateral Interbody Fusion and Pedicle Screw Fixation Using Fluoroscopy

Hiyama Akihiko,Katoh Hiroyuki,Sakai Daisuke,Sato Masato,Tanaka Masahiro,Watanabe Masahiko 대한척추외과학회 2022 Asian Spine Journal Vol.16 No.1

Study Design: Retrospective study.Purpose: The purpose of this study was to compare the accuracy of percutaneous pedicle screw (PPS) placement between prone and lateral decubitus positions during lateral lumbar interbody fusion (LLIF) and to evaluate the tendency of PPS positioning based on simple computed tomography measurements with patients in the lateral decubitus position.Overview of Literature: There is insufficient information in the literature regarding the accuracy of inserting a PPS using fluoroscopy in patients in the lateral decubitus position.Methods: We included 62 patients who underwent combined LLIF surgery and PPS fixation for degenerative lumbar spondylolisthesis with spinal canal stenosis. We compared the patient demographics and the accuracy of fluoroscopy-guided PPS placement between two groups: patients who remained in the lateral decubitus position for the pedicle screw fixation (single-position surgery [SPS] group) and those who were turned to the prone position (dual-position surgery [DPS] group).Results: There were 40 patients in the DPS group and 22 in the SPS group. Of the 292 PPSs, only 12 were misplaced. In other words, 280/292 screws (95.9%) were placed correctly in the pedicle’s cortical shell (grade 0). PPS insertion did not cause neurological, vascular, or visceral injuries in either group. The breach rates for the DPS and SPS groups were 4.1% (grade 1, 5 screws; grade 2, 3 screws; grade 3, 0 screw) and 4.1% (grade 1, 2 screws; grade 2, 2 screws; grade 3, 0 screw), respectively. Although there were no statistically significant differences, the downside PPS had more screw malpositioning than the upside PPS.Conclusions: We found that PPS insertion with the patient in the decubitus position under fluoroscopic guidance might be as safe and reliable a technique as PPS insertion in the prone position, with a misplacement rate similar to that previously published.

Air Pollutant Dispersion Phenomena at a Street under a Sky Train Station in Bangkok, Thailand

Hiyama, Kyosuke,Hoshiko, Tomomi,Prueksasit, Tassanee,Kato, Shinsuke,Koganei, Makoto Council on Tall Building and Urban Habitat Korea 2013 International journal of high-rise buildings Vol.2 No.2

The ventilation performance of a street in Bangkok, Thailand, was investigated by performing measurements and conducting a CFD analysis. We focused on a street that was covered by an elevated train station. It was shown that the ventilation efficiency varied drastically depending on the angle between the street and the wind direction. When the wind direction was parallel to the street, the elevated structure had a negative influence, which created higher pollutant concentrations than in locations without elevated structures. However, when the wind direction was perpendicular to the street, the pollutant concentrations in the two situations were similar. Using a CFD analysis and ventilation performance indexes, it was shown that the elevated structure directed the wind flow and enhanced the ventilation efficiency, which positively affected ventilation performance. These kinds of knowledge can lead us to optimize city planning including high-rise buildings with high ventilation efficiency.

Experiments and analysis of the post-buckling behaviors of aluminum alloy double layer space grids applying ball joints

Hiyama, Yujiro,Ishikawa, Koichiro,Kato, Shiro,Okubo, Shoji Techno-Press 2000 Structural Engineering and Mechanics, An Int'l Jou Vol.9 No.3

This study discusses on the experimental and analytical results of the global buckling tests, carried out on aluminum alloy double layer space grids composed of tubular members, ball joints and connecting bolts at the member ends, with the purpose of demonstrating the effectiveness of a simplified analysis method using an equivalent slenderness ratio for the members. Because very few experiments have been carried out on this type of aluminum space grids, the buckling behavior is investigated experimentally over the post buckling regions using several space grid specimen with various values for the member slenderness ratio. The observed behavior duping the experiments is compared with the analytically obtained results. The comparison is made based on two different schemes; one on the plastic hinge method considering a bending moment-axial force interaction for members and the other on a method using an equivalent slenderness ratio. It is confirmed that the equivalent slenderness method can be effectively applied, even in the post buckling regions, once the effects of the rotational rigidity at the ball joints are appropriately evaluated, because the rigidity controls the buckling behavior. The effectiveness of the equivalent slenderness method will be widely utilized for estimation of the ultimate strength, even in post buckling regions for large span aluminum space grids composed of an extreme large number of nodes and members.

Designing Telepresence System for Distance Learning in Hyper-Aged Society

Atsushi Hiyama 한국교육공학회 2013 한국교육공학회 학술대회발표자료집 Vol.2013 No.1

Morphological abnormality rate of the pale grass blue butterfly Zizeeria maha (Lepidoptera: Lycaenidae) in southwestern Japan: A reference data set for environmental monitoring

Atsuki Hiyama,Wataru Taira,Mayo Iwasaki,Ko Sakauchi,Masaki Iwata,Joji M. Otaki 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.4

Morphological abnormalities of the pale grass blue butterfly, Zizeeria maha (Kollar) (Lepidoptera: Lycaenidae), have been successfully used as an environmental indicator to assess the biological impacts of the Fukushima Daiichi Nuclear Power Plant accident. To prepare for future nuclear accidents or other human and natural disasters, we examined the morphological abnormality rate of this butterfly in southwestern Japan and built a pre-disaster reference data set. We collected butterfly samples, primarily in summer 2015 from 52 localities, which were categorized into three regional groups associated with the Sendai, Ikata, or Takahama Nuclear Power Plant. Mean values of the abnormality rate and the wing color pattern modification rate for localities were 3.8% and 0.8%, respectively, indicating that butterflies were not under severe anthropogenic stress. Using all collected samples, the abnormality rate of females (7.4%) was significantly higher than that of males (2.8%). We did not detect any significant correlations of the abnormality rate or modification rate with latitude, ground radiation dose, or distance from the nuclear power plants. Based on logistic regression analyses, sex, annual average temperature, and monthly average temperature might have influenced morphological abnormalities, suggesting possible direct and epigenetic temperature effects on morphogenesis. These data serve as a reference data set for future nuclear accidents or other artificial or natural environmental disasters in southwestern Japan.

Evidence for estrogen receptor expression during medullary bone formation and resorption in estrogentreated male Japanese quails (Coturnix coturnix japonica)

Shinji Hiyama,Toshie Sugiyama,Seiji Kusuhara,Takashi Uchida 대한수의학회 2012 JOURNAL OF VETERINARY SCIENCE Vol.13 No.3

The temporal expression of estrogen receptor (ER)α and ERβ mRNA was examined in male Japanese quails. Femurs of quails receiving 17βestradiol underwent RTPCR and histochemical analysis 1 to 15 days after treatment. Untreated quails were used as controls (day 0). Between days 0 and 5, cells lining the bone endosteal surface differentiated into osteoblasts, which in turn formed medullary bone. Expression of ERα was already observed on day 0 and increased slightly during bone formation whereas ERβ was hardly detected throughout this process. After osteoclasts appeared on the medullary bone surface, this type of bone disappeared from the bone marrow cavity (days 7∼15). ERα expression simultaneously decreased slightly and ERβ levels remained very low. These results suggest that estrogen activity mediated by ERα not only affects medullary bone formation but also bone resorption.

Narrow-band imaging with magnifying endoscopy for Peyer`s patches is useful in predicting the recurrence of remissive patients with ulcerative colitis

( Satoshi Hiyama ),( Hideki Iijima ),( Syoichiro Kawai ),( Akira Mukai ),( Eri Shiraishi ),( Shuko Iwatani ),( Toshio Yamaguchi ),( Manabu Araki ),( Yoshito Hayashi ),( Shinichiro Shinzaki ),( Tsuneka 대한장연구학회 2016 Intestinal Research Vol.14 No.4

Background/Aims: Peyer`s patches (PPs) are aggregates of lymphoid follicles that are mainly located in the distal ileum; they play a major role in mucosal immunity. We recently reported that patients with ulcerative colitis (UC) have alterations in PPs that can be detected using narrow-band imaging with magnifying endoscopy (NBI-ME). However, the usefulness of NBI-ME in UC treatment as a whole is still unknown. Methods: We collected NBI-ME images of PPs from 67 UC patients who had undergone ileocolonoscopy. We evaluated changes in the villi using the “villi index,” which is based on three categories: irregular formation, hyperemia, and altered vascular network pattern. The patients were divided into two groups on the basis of villi index: low (L)- and high (H)-types. We then determined the correlation between morphological alteration of the PPs and various clinical characteristics. In 52 patients who were in clinical remission, we also analyzed the correlation between NBI-ME findings of PPs and clinical recurrence. Results: The time to clinical recurrence was significantly shorter in remissive UC patients with Htype PPs than in those with L-type PPs (P <0.01). Moreover, PP alterations were not correlated with age, sex, disease duration, clinical activity, endoscopic score, or extent of disease involvement. Multivariate analysis revealed that the existence of H-type PPs was an independent risk factor for clinical recurrence (hazard ratio, 3.3; P <0.01). Conclusions: UC patients with morphological alterations in PPs were at high risk of clinical relapse. Therefore, to predict the clinical course of UC, it may be useful to evaluate NBI-ME images of PPs. (Intest Res 2016;14:314-321)

Sampling efficiency of the pale grass blue butterfly Zizeeria maha (Lepidoptera: Lycaenidae): A versatile indicator species for environmental risk assessment in Japan

Atsuki Hiyama,Wataru Taira,Ko Sakauchi,Joji M. Otaki 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.2

The pale grass blue butterfly, Zizeeria maha (Lepidoptera, Lycaenidae), has successfully been employed as an indicator species to evaluate acute biological changes in polluted human-living environments after the Fukushima nuclear accident. Here, we quantitatively examined the field sampling efficiency of the butterfly and its associated sexual sampling bias under different conditions, which may provide important information for environmental risk assessment. Sampling data were obtained in 2014 and 2015 from 87 localities across Japan. Across the localities, the mean capture rate was 17 individuals per hour per person, and males represented approximately 80% of the collected butterflies. No significant difference was detected in the capture rate under different weather conditions. Among the four habitats, the riverside showed a significantly higher capture rate than the city park. A shorter sampling time tended to yield a higher capture rate. Comparisons among prefectures and districts of collection localities revealed that the Kanto district had significantly higher percentages of collected males than 4 other districts. Fukushima prefecture also had high percentage, although not significant. A generalized linear mixed model indicated that the capture rate was significantly negatively affected by the agricultural village, the city park, the rainy weather, and latitude and positively by longitude. Together, the present study showed high sampling efficiency and versatility of this butterfly as an indicator for environmental risk assessment but simultaneously suggested preferable conditions for a field sampling design. This study also suggested a possibility that the Fukushima nuclear accident or other factors might have affected behavioral or population dynamics of the butterfly.

Design and Synthesis of Liquid Crystalline Materials

( Tamejiro Hiyama ) 한국공업화학회 2006 한국공업화학회 연구논문 초록집 Vol.2006 No.1