고려인삼의 주아 발달 경로에 대하여

정찬문,임흥빈,이이,정열영,전병록 충북대학교 연초연구소 2009 煙草硏究 Vol.22 No.-

본 시험은 인삼의 채종종자의 조직을 관찰하여 잠아의 실체를 조사하였고 묘삼의 잠아특성을 산지별로 조사하여 다경이 되는 잠아의 발달경로를 알아보았다. 그리고 묘삼을 본포에 이식하여 3년생을 채굴하여 4년생이 될 주아의 생성경로를 조사하였다. 1. 묘삼의 주아는 발아종자의 경근천이부에서 피층조직이 융기하여 돔(dome)형태의 원잠아 또는 측잠아가 형성된 후 이들 조직이 분화하여 발달하였다. 2. 묘삼의 단뇌는 90%가 원잠아에서 유래하였고 쌍뇌는 원잠아와 2%정도의 측잠아1개가 발달되어 형성되었으며 3뇌는 원잠아와 측잠아 2개가 발달하여 형성되었다. 3. 본포에서 2년생과 3년생은 주아가 단뇌로 형성되어 있어 2경개체가 발생하지 않으나 4년생은 3년생에서 발달한 쌍뇌 이상의 주아가 있어 2경개체이상이 관찰되는 최초의 연생이었다. 4. 4년생의 주아는 종자에서 형성된 원잠아, 측잠아와 2-3년생에서 뇌두부위에서 형성된 피층잠아에서 유래하는 것으로 고년생으로 갈수록 쌍뇌 또는 3뇌는 원잠아에 비해 피층잠아 유래의 주아가 많았다. We studied the substance of latent bud by surveying the embryo of harvested seed and developmental pathway of latent bud by analysing the characteristics of latent bud of local ginseng lines. We transplanted one year old ginseng seedlings in the field and harvested it out two years later. And then We investigated developmental pathway of the main bud which would be the shoot of ginseng in the fourth year. Main bud of seedling was formed from the region between root and shoot of germinating seed. Primary and axillary latent buds protruded in dome shape from cortex tissue and differentiated into main bud. Ninety percent of single main bud was derived from primary latent bud, twin main buds were derived from primary latent bud and one axillary bud, and triple main buds were derived from primary latent bud and two axillary latent buds. In the field, We could not find 2-stem plant from 2-3 years old plant, however, We found 2-stem plant from 4-year-o1d plant because twin main buds developed from 3-year-o1d plant. Therefore 2-stem plant was observed obviously from the plant at least 4 years old. Main buds of 4-year-old plant were formed from primary and axillary latent bud of seed and cortex latent bud of rhizome from 2-3 years old plant. In older plants, twin and triple main buds were derived more from cortex latent bud than primary latent bud.

NiCuZn계 페라이트의 소결온도 변화에 따른 전자파 흡수특성

박찬규,이상록 東亞大學校 2003 東亞論叢 Vol.40 No.-

A EMI/EMC preventing NiCuZn ferrite is prepared by sintering ferrite type or mixing ferrite powder with resin polymers. This paper describes the research on electromagnetic wave absorbtion and shielding properties by sintering temperature of NiCuZn ferrite. NiCuZn ferrite was made that calcination condition was 900℃ in air atmosphere and powder metallurgy process. The best sintering condition was 1080℃ in air atmosphere sinterability at sinterability thickness of 5mm.

연쇄가지반응 모델에 의한 화학반응 장치의 안전성

이상록,염치호,박찬규 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1

The method for determining the stability and multiplicity of steady states, and steady reaction region in phase plane for chain branching reaction model in perfectly mixed flow tank reactors is proposed. The results proposed are as follows : 1) stability and multiplicity of steady states exist 2 points (T_S1 : node, T_S2 : saddle) in T<T_1 range, and 2 points (T_S3 : focus, T_S4 : saddle) in T>T_2range on F(T)=0 curve. 2) steady reaction region containing the steady states can be constructed by the state varialbes of a reactor in phase plane. All trajectories of the representative points pass into the region at the boundary surface since the representative points in the region never drift out, it is safe to keep the reactor operation in the region.

NiCuZn계 페라이트의 화학적 조성변화에 따른 전자파 흡수특성

박찬규,이상록 東亞大學校 2003 東亞論叢 Vol.40 No.-

As the information communication technique was advanced, the damage of the electromagnetic waves is increasing. This study describes electromagnetic wave absorption properties according to chemical composition ratio of NiCuZn ferrite, which is used electromagnetic wave absorption and shielding material. The best composition ratio, as best condition of electromagnetic wave absorption properties, was Fe₂0₃ 49.0 mol%, NiO 8.5 mol%, CuO 8.5 mol%, ZnO 34.0 mol%.

위발성 위장관 악성림프종 환자에서 항암치료의 효과

김찬규,신영록,김현정,배상병,이남수,이규택,박성규,원종호,홍대식,박희숙 순천향대학교 2006 Journal of Soonchunhyang Medical Science Vol.12 No.1

Purpose: The gastrointestinal (GI) tract is the most common site of extranodal non-Hodgkin's lymphoma (NHL), which is increasing in incidence, but there is no established optimal treatment modality. Thus, this study was investigated the clinicohistologic feature, the therapeutic modalities, and the prognosis for GI-NHL, as well as the factors affecting it. Methods: We retrospectively analyzed 45 patients who had been diagnosed as having GI-NHL and had been followed up from July 1994 to February 2005 at Soonchunhyang University Hospital. The patients were divided into groups according to the site of origin and to various other features, and the survivals of the various groups were compared. The modified Ann Arbor system and WHO classification were adopted for staging and histopathologic classification, respectively. Results: GI-NHL of the stomach, small bowel, ileocecal region, and colon occurred in 28 patients (62.2%), 5 patients (11.1%), 3 patients (6.7%), and 8 patients (17.8%), respectively, In one patient, the entire gastrointestinal tract was diffusely involved. The median age of patients was b5 years (25~78 years), and male-to-female ratio was 1:1.1. Fourteen patients were in stage Ⅰ, 24 in stage Ⅱ, 4 in stage Ⅲ, and 3 in stage Ⅳ. Surgical resection was performed in 19 patients, and combination chemotherapy was performed in 43 patients. Surgical resection only was performed in 4 patients, Chemotherapy only was performed in 26 patients. The expected overall 5 year survival of 45 patients was 39.6%, and there was a significant survival difference between the stages, but between sites of origin (p=0.842). The most important factors influencing the survival was the stage and other factors were not significant. Conclusion: The stomach was the most common site of GI-NHL. Most GI-NHL were localized Stage was the most important prognostic factor. However, Prospective randomized studies are needed to approve the therapeutic modality.

Atomic Layer Deposition of Transition/Post-Transition Metal Oxide Thin Films towards High-Performance Transparent Electronics

Chan-Rok Park,Myeong-Hee Ko,Shin-Ik Kim,Seong-Keun Kim,Seung-Hyub Baek,Jin-Sang Kim,Jin-Ha Hwang 한국진공학회 2014 한국진공학회 학술발표회초록집 Vol.2014 No.8

Electrical/Dielectric Characterization of 2-Dimenisonal Electron Gas Layers Formed between LaAlO₃ and SrTiO₃

Chan-Rok Park,Kyeong-Woo Kwon,Woo-ri Do,Da-Hee Park,Senug-Hyub Baek,Jin Sang Kim,Jin-Ha Hwang 한국진공학회 2014 한국진공학회 학술발표회초록집 Vol.2014 No.2

Attenuation Effect of PET Images with and Without the Magnetic Resonance Breast Coil using Various MR Attenuation Correction Sequences

Chan Rok Park,Youngjin Lee,Hyungjin Yang 한국자기학회 2018 Journal of Magnetics Vol.23 No.3

The present study aims to confirm the attenuation correction (AC) in positron emission tomography (PET) images using various magnetic resonance (MR) sequences with and without the MR breast radiofrequency(RF) coil, and thus to evaluate the attenuation effect of the MR breast RF coil. To that purpose, we reconstructed non-attenuated PET data using the MR ACDixon-CAIPI, MR ACUTE, and MR ACDixon-GRAPPA sequences. The results indicated that the signal loss of the PET image with the MR breast RF coil was the lowest when the MR ACDixon-GRAPPA sequence was applied. In conclusion, the MR ACDixon-GRAPPA sequence maintained PET image quality when using the MR breast RF coil during PET/MR scanning.

Electrical/Optical Characterization of Zn-Sn-O Thin Films Deposited through RF Sputtering

Chan-Rok Park,Moon-Su Yeop,Bo-Ram Lee,Ji-Soo Kim,Jinha Hwang 한국진공학회 2012 한국진공학회 학술발표회초록집 Vol.2012 No.8

Comparison of Image Quality According to Phantom Fluid Material in MR-based Attenuation Correction PET Imaging in PET/MR

Chan Rok Park 한국자기학회 2021 Journal of Magnetics Vol.26 No.3

Integrated positron emission tomography (PET)/magnetic resonance (MR) imaging is gradually being used to improve the rate of cancer lesion detection in the medical field. To enhance the quality of PET/MR images, attenuation correction (AC) techniques are used by applying MR pulse sequences of the controlled aliasing in parallel imaging results in higher acceleration (CAIPI; MR ACDixon-Caipi) and the generation autocalibrating partially parallel acquisition (GRAPPA; MR ACDixon-Grappa), based on the T1-weighted two-point Dixon pulse sequence. In addition, quality control using a Jaszczak phantom filled with water and radioisotopes is frequently performed when scanning the patient. When acquiring MR-based AC PET images in the phantom study, artifacts are caused by high permittivity in water, and there is a limitation in the acquisition of uniform image quality. Therefore, the purpose of this study was to compare the image quality using phantom fluids with lower permittivity than water (sodium chloride (NaCl) NaCl+nickel sulfate (NiSO₄)) according to MR ACDixon-Caipi and MR ACDixon-Grappa pulse sequences using various quantitative analysis parameters: percent of non-uniformity (PNU), percent contrast recovery (PCR), signal to noise ratio (SNR), and coefficient of variation (COV). The results indicated that the image quality with NaCl+NiSO₄ fluid based on the results was 1.2-, 1.6-, 1.4-, and 1.1 times superior to that of NaCl fluid, respectively. In conclusion, NaCl+NiSO₄ fluid is suitable as a phantom fluid material in PET/MR images.