Effects of glyceollin I on vascular contraction in rat aorta

Song, Min-Ji,Baek, Inji,Jeon, Su Bun,Seo, Minchul,Kim, Yong-Hoon,Cui, Song,Jeong, Yeon-Shin,Lee, In-Jung,Shin, Dong Hyun,Hwang, Young Hyun,Kim, In Kyeom Springer-Verlag 2010 Naunyn-Schmiedeberg's archives of pharmacology Vol.381 No.6

환형 팬 설계 및 성능 확인 시험

정민철(Minchul Jung),오세진(Sejin Oh),송시몬(Simo Song) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11

The demand for household appliances, such as air conditioners, has surged in response to frequent heat waves. Consequently, the need for efficient and quiet axial fans has grown, aiming to minimize carbon emissions and power consumption. Building on research from MIT regarding toroidal propellers, we embarked on designing and manufacturing toroidal-shaped axial fans. These toroidal fans, along with a reference fan for benchmarking, were fabricated using an SLA printer and subsequently affixed to a DC motor. Comprehensive measurements were carried out, including flow velocity, RPM, and power input using an anemometer, tachometer, and power supply readings, respectively. Noise levels were recorded with a microphone and analyzed with digital audio workstation (DAW) software. Our findings indicate that toroidal fans can generate flow velocities comparable to those of traditional axial fans. However, further investigations are warranted to assess their flow rate characteristics, and attention must be given to varying noise levels associated with different frequencies.

Development of Regulatory Guidance on Conditional Clearance for the Disposal, Recycling and Reuse of Activated Medical LINAC Components

Byeonghyeon Park,Minchul Song,Jonghoon Park,Jaeho Lee 한국방사성폐기물학회 2020 한국방사성폐기물학회 학술논문요약집 Vol.2020 No.12

트럭 전방침입방지 장치 개발에 관한 연구

송주현(Juhyun Song),김민철(Minchul Kim) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2007 No.11

세립분 함량에 따른 준설토의 분리 퇴적 특성

박민철(Park Minchul),이종경(Lee Jongkyung),신효희(Shin Hyohee),이송(Lee Song) 한국지반환경공학회 2011 한국지반환경공학회논문집 Vol.12 No.6

준설매립이 활발히 진행되고 있는 서해안 지역 준설토는 일반적으로 조립분 함량이 높다. 이 지반을 펌프로 준설 시 토출구의 위치 및 흙의 공학적 성질에 따라 다른 거동을 나타낼 것이다. 따라서 본 연구에서는 세립분 함량 변화에 따른 준설토의 분리 퇴적특성을 구현하기 위해서 상사의 법칙을 적용하여 길이 2,650㎜, 폭 770㎜, 높이 735㎜의 모형토조장비를 제작하여 SM과 ML시료로 단계투기방법과 함수비 300%, 500%, 700%에 대하여 실험을 실시하였다. 분석결과, ML시료는 초기함수비가 높을수록 침강완료시간에 빨리 도달하였고 확산거리가 멀어질수록 침강시간은 길어졌다. SM시료는 확산거리 120㎝까지 조립토의 거동을 보이며 그 이상의 확산거리에서는 세립분의 영향으로 ML시료와 비슷한 경향을 보였다. 함수비와 세립분 변화 역시 ML시료는 심도가 낮아지고, 확산거리가 멀어질수록 통과율이 커지고 함수비는 작아짐을 확인할 수 있었고, SM시료는 확산거리가 가까운 구역에서는 조립토가 쌓여있고 먼 구역에서는 세립토가 쌓여있어 두 시료의 경계지점인 120㎝∼160㎝을 기준으로 세립분 함유량과 함수비의 큰 차이가 보임을 확인하였다. 또한, 전단강도는 확산거리에 따라 ML-최대 2.97㎪, SM-최대 10.2kPa임을 확인할 수 있었다. Dredged and reclaimed ground in progress at the West Coast has a high content of coarse particles. There will be different behaviors depending on the location of outlet and engineering properties of soil when its ground is dredged by a pump. Therefore, the experiments were conducted that were manufactured about the chamber equipment of length 2,650㎜, width 770㎜, height 735㎜, experimented step filling method and water content about 300%, 500% and 700% respectively with SM and ML samples in order to realize segregating sediment characteristics of dredged ground with changing much fine. With results of analysis, ML sample by higher initial water content was reached to the period of complete sedimentation and coefficient of sedimentation consolidation increased with increases of diffusion distance. SM samples showed behavior of coarse soil with diffusion distance 120㎝, diffusion distance of more than 120㎝ showed a similar tendency with ML sample under the influence of fines. In ML sample, it could be also found that lower depth and the more increasing diffusion distance increase in percentage of sieve #200 but water content decreases. In SM sample, it could be also found that coarse soil was piled at near the diffusion distance zone but fine soil was piled at the far diffusion distance zone and prominent difference showed between percentage of sieve #200 and water content(%) by boundary point 120㎝∼160㎝ of both samples. Also, shear strength was expressed ML-maximum 2.97㎪, SM-maximum 10.2kPa with diffusion distance.

친환경 하상차수공법 현장 적용성에 관한 연구

박민철(Park Minchul),김성구(Kim Seonggoo),곽노경(Kwak Nokyung),신효희(Shin Hyohee),이송(Lee Song) 한국지반환경공학회 2011 한국지반환경공학회논문집 Vol.12 No.1

급속한 경제발전시기에는 하천공사 시 유해한 재료를 사용함으로써 환경오염으로 인한 인간 및 동식물에 악영향을 끼치는 사례가 많이 발생하였다. 이를 복구하는 시간 및 비용이 많이 소요되는 실정이다. 따라서 본 연구에서는 하천공사 중의 차수공사시 환경오염 문제점을 극복할 수 있는 친환경적이면서 경제적으로 저렴하고, 장기적으로 사용할 시 내구성에 문제없는 공법을 적용하고자 실내모형실험결과와 현장실험결과를 비교?분석하였다. 실내실험결과 콘크리트 포장재, 아스팔트 포장재, 벤토나이트 매트, 고화토공법, 혼합토공법은 적은 침투량을 나타내었고, 이와 반대로 다짐흙, 초지, 투수성 포장재는 많은 양의 침투량이 발생되었다. 현장투수실험결과는 실내실험투수결과와 비슷한 경향을 나타냈으며, 국내차수시설 투수기준인 1.0×10<SUP>-7</SUP>㎝/sec 이하에 모두 만족하였다. 또한, 일축압축강도는 1.0㎫ 이상 결과값을 얻어 기준에 만족하였고, 다짐도가 증가할수록 일축압축강도는 증가하고 투수계수는 감소하는 경향을 확인할 수 있었다. In period of rapid economic development, as doing river conservation work by using harmful materials environmental pollution has adversely effected humans, animals and plants frequently. For recovery of environmental pollution it needs a lot of time and cost. Therefore, in this study, in order to take an environment-friendly method which is also economical and durable both results of the laboratory model test and field test were compared and analyzed. According to the results of the laboratory model test, those methods such as concrete paving, asphalt paving, bentonite mat, stabilized soil method and mixed soil method have small amount of seepage, but on the other hand compaction soil, grassland and permeable materials have considerable amount of seepage. The results of field test show a similar tendency with laboratory test and have been satisfied to assess standard of domestic water permeability below 1.0×10<SUP>-7</SUP>㎝/sec and unconfined compressive strength is also than 1.0㎫ so it has been satisfied about standard. In conclusion, as compaction rate increased, as unconfined compression strength increased and coefficient of permeability decreased.

GCP공법의 복합통수능 효과 분석

박민철(Park, Minchul),권혁찬(Kwon, Hyukchan),신효희(Shin, Hyohee),장기수(Jang, Gisoo),이송(Lee, Song) 한국지반환경공학회 2011 한국지반환경공학회논문집 Vol.12 No.12

연직배수공법은 효과적인 연약지반 압밀촉진 방법으로 적용빈도가 증가하고 있다. 연직배수 공법 중에서 PBD공법은 현재 가장 많이 사용되고 있는 압밀촉진공법으로 경제성 및 시공성 면에서 우수하나, 환경오염 및 대심도의 경우 배수재의 굴곡으로 인한 통수능 저하 문제점을 지니고 있다. SCP공법은 과거에 통수능력이 우수하여 많이 사용되었으나, 재료의 수급불균형으로 인한 가격급등으로 현재는 과거보다 사용이 많이 줄고 있는 실정이다. 이에 따른 대책 재료로 쇄석말뚝을 이용한 GCP공법이 대두되고 있다. 따라서 GCP공법의 통수능 효과를 분석하기 위하여 ?38×70cm의 원형토조를 이용하여 쇄석말뚝과 비교대상인 모래말뚝, PBD공법의 3종류의 연직배수재를 이용하여 복합통수능 실험을 실시하였다. 또한, 쇄석말뚝의 클로깅(Clogging) 범위를 파악하기 위하여 1.0m×0.5m×1.1m 대형토조를 정면에 투명 아크릴로 제작하여 하중단계별 클로깅(Clogging) 범위를 분석하였다. 복합통수능 시험결과 하중증가에 따른 간극비 감소 및 클로깅(Clogging) 현상이 많이 발생한 GCP공법에서 가장 적게 발생하였으며, 또한 GCP 공법의 클로깅(Clogging)의 범위는 거의 10% 내에서 발생하는 것으로 분석되었다. An application frequency of vertical drainage method is increasing as an effective consolidation acceleration method. PBD method is most frequently used as a consolidation acceleration method in vertical drainage methods. PBD is economical and easy to operate but has some problems those are an environmental pollution and a decrease of a discharge capacity caused by bending of drainage materials when it is used in great depth. SCP method was frequently used because it"s discharge capacity was good but now it is rarely used because of an increase of the material price because of an order imbalance. As the way to solve these problems, GCP method has been to the fore. For analyzing the effect of GCP method on the discharge capacity, three types of composite discharge capacity tests are done by using GCP, SCP and PBD respectively with the circle case, Φ38×h70cm. On the contrary to this, GCP shows the worst discharge capacity for a decrease of the void ratio and the clogging phenomenon caused by increasing load. Also to figure out the clogging range of GCP, the clogging of GCP is checked in each load stage with a large case(1.0m×0.5m×1.1m) which has clear acrylic front face. The diameter of GCP was 35cm and a clogging phenomenon occurred in 10% approximately. The result shows that the discharge capacity of GCP was given the lowest value for a decrease of the void ratio and the clogging phenomenon causing by increasing load. And the clogging phenomenon mostly occurred within 10% of GCP’s diameter range.

Open-Mouth Bone Scintigraphy Is Better than Closed-Mouth Bone Scintigraphy in the Diagnosis of Temporomandibular Osteoarthritis

Park, Ki Seong,Song, Ho-Chun,Cho, Sang-Geon,Kang, Sae-Ryung,Kim, Jahae,Jun, Haeng Man,Song, Minchul,Jeong, Geum-Cheol,Park, Hee Jeong,Kwon, Seong Young,Min, Jung-Joon,Bom, Henry Hee-Seung The Korea Society of Nuclear Medicine 2016 핵의학 분자영상 Vol.50 No.3

Purpose Closed-mouth bone scintigraphy (CM scan) and closed-mouth single-photon emission computed tomography (CM SPECT) are used for conventional evaluation of osteoarthritis of the temporomandibular joint (TMJ). However, the adequacy of open-mouth bone scintigraphy (OM scan) has not yet been evaluated. Therefore, the purpose of this study was to compare the diagnostic performance of CM scan, CM SPECT, and OM scan. Methods Thirty-six patients with suspicion of an abnormality of the TMJ and who underwent a $^{99m}Tc-HDP$ CM scan, CM SPECT, and an OM scan were enrolled. The scans were assessed visually for the presence of positive focal uptake in the TMJ. Osteoarthritis was defined as arthralgia plus crepitus or radiologic signs of arthrosis. Results Of 72 TMJs, 21 (29.2 %) were diagnosed with osteoarthritis. The sensitivity, specificity, positive predictive value, negative predictive value and accuracy were 90.5 %, 49.0 %, 42.2 %, 92.6 % and 61.1 % for the CM scan, 81.0 %, 58.8 %, 44.7 %, 88.2 % and 65.3 % for CM SPECT, and 81.0 %, 82.4 %, 65.4 %, 91.3 % and 81.9 % for the OM scan, respectively. The accuracy of the OM scan was higher than that of CM SPECT and the CM scans (p = 0.004 and p < 0.001, respectively). Conclusions The OM scan was more accurate than the conventional CM scan and even CM SPECT for diagnosing TMJ osteoarthritis.

S.M.I 공법의 내구성 및 차수특성에 관한 실험적 연구

신효희(Hyohee Shin),박민철(Minchul Park),박경한(Kyeonghan Park),서지원(Jeeweon Suh),이송(Song Lee) 한국지반환경공학회 2013 한국지반환경공학회논문집 Vol.14 No.1

본 연구에서는 대표적인 물유리계 공법인 SGR 공법과 SMI 공법을 실내시험으로 공학적 특성을 비교한 것으로, 각 조건별 양생기간과 양생조건에 따라서 내구성, 강도 및 차수특성, 환경 영향성을 비교 ? 분석하였다. 그 결과 내구성의 경우 SGR 공법은 SMI 공법에 비해 최대 23배 정도 체적변형이 발생하였고, 환경에 미치는 영향은 두 시료 모두 안전한 것으로 나타났다. 차수특성의 경우 SMI 공법은 최대 24% 정도 감소하였으나 SGR의 경우 체적변형이 급격하게 발생하여 간극이 커져 투수계수가 커지는 경향을 나타냈으며, 강도특성은 SMI 공법이 SGR 공법 보다 호모겔의 경우 약 11.0배, 샌드겔의 경우 약 3.9배 정도 높게 나타났다. 이러한 주원인은 SMI 공법은 SGR 공법 보다 용출현상으로 인한 체적변형이 적게 나타났기 때문으로 판단된다. On this study, engineering properties of SGR method and SMI method, which are typical sodium silicate methods, were compared through the laboratory test and durability, strength, waterproof characteristic and environmental effects were compared and analyzed with period and condition of curing on each case. As a result of durability test, volume change of SGR is approximately 23-times greater than SMI and the effects on environment are appeared safe on all method. In case of waterproof characteristic test, permeability coefficient is decreased about 24% on SMI, whereas on SGR permeability coefficient is showed to increase because rapid volume change make wider void. Strength characteristics of SMI are appeared higher about 11-times in case of homogel and 3.9-times in case of sandgel than SGR. Which is because volume change of SMI, caused by leaching, is smaller than SGR.

Iodine Uptake Patterns on Post-ablation Whole Body Scans are Related to Elevated Serum Thyroglobulin Levels After Radioactive Iodine Therapy in Patients with Papillary Thyroid Carcinoma

Jeong, Geum-Cheol,Song, Minchul,Park, Hee Jeong,Min, Jung-Joon,Bom, Hee-Seung,Cho, Sang-Geon,Park, Ki Seong,Kang, Sae-Ryung,Kim, Jahae,Song, Ho-Chun,Kwon, Seong Young The Korea Society of Nuclear Medicine 2016 핵의학 분자영상 Vol.50 No.4

Purpose Serum thyroglobulin (Tg) level is frequently elevated shortly after radioactive iodine (RAI) ablation therapy. The authors studied the relationship between the elevation of serum Tg after RAI therapy and iodine uptake pattern on post-ablation whole body scans (RxWBSs) in patients with papillary thyroid carcinoma (PTC). Materials and Methods The study subjects were patients with PTC that had undergone first RAI therapy with thyroid hormone withdrawal after total thyroidectomy. Patients with a high level of serum anti-Tg antibody (TgAb, ${\geq}60U/mL$), possible regional or distant metastasis as determined by pre-ablation or post-ablation studies, and negative iodine uptake of the anterior neck on RxWBS were excluded. Serum Tg was checked twice, that is, 7 days after (post-ablation Tg) and on the day of RAI therapy (pre-ablation Tg). Ratio of pre-ablation Tg to post-ablation Tg (Tg ratio) was used to assess changes in serum Tg levels after RAI therapy. Patients were classified into two groups according to the presence of midline uptake above the thyroidectomy bed on RxWBS (negative (group 1) or positive (group 2) midline uptake). Variables were subjected to analysis to identify differences between the two groups. Results Two hundred and fifty patients were enrolled in this study; 101 in group 1 and 149 in group 2. Based on univariate analysis, post-ablation Tg ($8.12{\pm}11.05$ vs. $34.12{\pm}54.31$; P < 0.001) and Tg ratio ($7.81{\pm}8.98$ vs. $20.01{\pm}19.84$; P < 0.001) were significantly higher in group 2. On the other hand, gender, tumor (T) stage, lymph node (N) stage, size, multiplicity or bilaterality of primary tumor, dose of $^{131}I$, serum TgAb and thyroid-stimulating hormone (TSH) level (before or after RAI therapy) were not significantly different in the two groups. Variables with P values of < 0.25 by univariate analysis were subjected to multivariate analysis, which showed post-ablation Tg (OR 1.060, 95 % CI = 1.028-1.092; P < 0.001) and Tg ratio (OR 1.059, 95 % CI = 1.028-1.092; P = 0.001) were significantly higher in group 2. Conclusion Serum Tg level after RAI therapy was significantly higher in patients with midline uptake on RxWBS, compared with patients without midline uptake on RxWBS. Further investigations are needed to reveal the correlation between serum Tg elevation and clinical outcome according to the presence of midline uptake.