• Journal of the Korean Crystal Growth and Crystal Technology
• /
• v.3 no.2
• /
• pp.167-175
• /
• 1993

Lithium-Carbon Intercalation Compounds(Li-CICs) have been synthesized from various carbon ma-terials by use of the modified stainless steel two-bulbs methods. These compounds had various colours by structural character of starting materials. The synthesized Li-CICs were identified to stage formation process by X-ray diffraction data. At these results, well-oriented natural graphite and graphite fiber are formed lower stages(Stage 1, Stage 2), but poor-oriented carbon fiber and petroleum cokes are also formed higher stages(Stage 3, Stage 4, Stage 5). And when we compared with measured d value and calculated d value, these values agreed with each other. But poor-oriented carbon materials are some difference from them. The stage stability and energy stage of Li-CICs were obtained by UV/VIS Spectrophotometric data. X-ray diffraction and UV/VIS Spectrophotometric data suggested that well-oriented carbon materials has distingushible curve between energy and reflectance. In these results, we know that many charge carriers between carbon layers are related to concentration of intercalants. And then, this paper also provides information on high efficiency energy storing materials at intercalation process of Li-CICs.

• Korean Journal of Plant Resources
• /
• v.22 no.2
• /
• pp.116-122
• /
• 2009

Heteropappus arenarius Kitam., an autumn-flowering biennial belonging to wild chrysanthemums, is found to be native in southeastern coastal area and Jeju island of Korea. It could play a good role for ground cover plants on a large-scale landscape area, especially, barren soil or sloping hillside. This study was initiated to screen optimum germination temperature influenced by local strain and harvesting stage of H. arenarius. The following was the response of seed germination between local strain and temperature. The average of final germination percentage (FG) was the highest in 'Guryongpo' (89.7%) among four local strains, followed by 'Gujwa' (87.3%), 'Gampo' (87.3%), and 'HKNU-I' (71.5%). The average of $T_{50}$ was shorter in 'Gujwa' (3.6 d) and 'Guryongpo' (4.0 d) than the others. The average of FG and $T_{50}$ was the highest as 76.2% and shortest as 3.6 d in $20^{\circ}C$, respectively, followed by $30^{\circ}C$, $25^{\circ}C$, and $15^{\circ}C$. In case of 'Gujwa', however, FG and T50 was higher in $20^{\circ}C$ and shorter in $15^{\circ}C$ than others. In the relationship between harvesting stage and temperature, the average of FG was greatly higher in Stage III (90.7%) and Stage IV (88.6%) than the others including Stage II (35.7%) and Stage I (26.0%). The average of $T_{50}$ was shorter in Stage IV (3.7 d) and Stage III (4.3 d) than the others, which showed less than 50% of FG. Nevertheless, the available range of seed harvesting stage was from Stage I to Stage IV because H. arenarius seeds could germinate at all stages. In conclusion, it was recommended that the optimum temperature and harvesting stage was $20^{\circ}C$ and Stage $III{\sim}IV$, respectively, for seed germination of H. arenarius.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.40 no.1
• /
• pp.92-97
• /
• 1995

The objective of this study is to investigate the growth characters of overhead flooded soybean plants at four growth stage. Overhead flooding treatments were applied at the vegetative growth stage ($V_3,\;V_6$) and the reproductive stage ($R_2,\;R_4$) for 6.12.24 hrs, respectively. Yield and yield components were more decreased as the overhead flooding duration was longer and the growth stage was later. Yield was not reduced significantly in soybean plants flooded at $V_3$ stage regardless of flooding duration, and flooded 6 or 12 hrs at $V_6$ stage. When compared to the control, 27 to 36% of yield reduction was observed in soybean plants flooded for 24 hrs at $V_6$ stage, 6 or 12 hrs at $R_2$ stage, and 6 hrs at $R_4$ stage. And 43%, 53% and 66% of yield were reduced through the flooding treatment for 24 hrs at $R_2$ stage 12 hrs and 24 hrs at $R_4$ stage, respectively. So yield reduction was higher in overhead flooded soybean plants at the reproductive stage than that at the vegetative growth stage.

• Journal of Chest Surgery
• /
• v.20 no.2
• /
• pp.328-341
• /
• 1987

We reviewed 147 cases of primary carcinoma of the lung between January 1975 and December 1986 at the Thoracic and Cardiovascular Department, Yonsei university College of Medicine, Seoul, Korea. There were 116 males and 31 females with 93.72% ranging in age from 40 to 69 years. The mean age was 61.01 years. To 69 years of age with 61.01 years of mean age. There were 92 [62.59%] cases of squamous cell carcinoma, 29 [19.73%] cases of adenocarcinoma, 8 [5.44%] cases of undifferentiated large cell carcinoma, 8 [5.44%] cases of undifferentiated small cell carcinoma and 10 [6.8%] cases of bronchoalveolar cell carcinoma. 50 [34.01%] patients in stage I and 49 [33.26%] patients in stage II underwent pneumonectomies and lobectomies with a 67.27% rate of resection, where as only 49.12% of stage III patients were resected. Also 7 [30.43%] of the 23 stage IV cases were surgically resected and confirmed stage IV after surgical resection. The actuarial survival rate according to classification are as follows. The one and 3 year survival rate of the patients in stage I were 96% and 84% respectively. The one and `3 year survival rate of the patients in stage II were 100% and 66.6%, whereas the one and 3 year survival rate of the patients in stage III, T3 were 78.57% and 69.84%. The survival rates of patients in stage I, II, III T3 were better than those of the other stages. There were significant differences in observed survival for patients with stage II as compared with the patients with stage Ill, T3. [p=0.0005]. An aggressive surgical approach still offered the greatest chance for long-term survival even in stage Ill, T3. The survival rate in patients with resectable cases including stage III, T3 might be improved with an aggressive surgical approach. The one and 3 year survival rates of patients in stage III, N2 were 56.67% and 43.7 I%. The one and 3 year survival rates of patients in stage IV were 21.43% and 3.57%. Patients in stage III, N2 or IV had markedly decreased survival rates. When the carcinoma cell type was the basis for the determination of rate of survival, the result were as follows; The one, 3 and 5 year survival rates of squamous cell carcinoma were 78.33%, 60.19%, and 57.32%, and the one and 3 year survival rates of adenocarcinoma were 55.56% and 44.49%. The survival rates of large cell carcinoma were 66.67%, and 44.45%, at one, three and five years respectively. The one and 3 year survival rates of bronchoalveolar cell carcinoma were 71.43% and 47.62%, the one, 3 and 5 year survival rates of small cell carcinoma were 40%, 20% and 20%. The survival rate of squamous cell carcinoma was better than that of other cell carcinomas, the survival rate of small cell carcinoma was the worst. The operative mortality rate was 1.36%. There were 10 cases of post-operative complications including 2 cases of bleeding which required further surgery, 2 cases of wound infection, and 4 cases of empyema thoracis. The length of survival of three of the empyema thoracis cases was 16, 98 and 108 months respectively, Four male patients all older than 47 years survived more than 9 years, post surgery, although one developed empyema thoracis. These four cases were initially classified as 2 cases of stage I and one each of stage II and stage III, T3. We have concluded that the survival rates of patients in stages I, II and III, T3 were improved after complete surgical resection.

• Journal of Power System Engineering
• /
• v.14 no.5
• /
• pp.10-16
• /
• 2010

The main object of this study is to investigate the collection characteristics of multi-layer multi-stage porous plate system experimentally. The experiment is carried out to analyze the characteristics of pressure drop and collection efficiency for the present system with the experimental parameters such as inlet velocity, tube diameter, inlet concentration, and stage number, etc. In results, the pressure drop becomes 22 to $115mmH_2O$ with increment of stage number (1 to 5) of porous plate system at tube velocity 15 m/s and tube diameter ${\Phi}8$. In case of fly ash and 5 stage, the collection efficiency becomes 90.5 to 95.7% increasing the tube velocity 12 to 15 m/s at inlet concentration $3g/m^3$ and tube diameter ${\Phi}8$. Additionally, it is estimated that the collection efficiencies of 5 stage are 94.3, 95.6 and 99.1% for fly ash, steel dust and based power, respectively (${\Phi}8$ tube, $V_t$ = 12m/s, inlet concentration $3g/m^3$).

• Proceedings of the KSME Conference
• /
• 2008.11a
• /
• pp.948-954
• /
• 2008

In this study, vibrational characteristics of two nano-imprinting stages is analyzed and compared with respect to the methodology to support the upper-plate of the stage. The first type of the stage has three supporters at each corners of the stage and one thrust bearing at the center of the stage. The other type of the stage has four supporter in each corner of the stage without a thrust bearing. The FEM software with flexible modeling is used for the normal mode analysis. The result depicts the difference of vibrational characteristics caused by the difference of support methods. The design criteria for the precision nano-imprinting stage is also discussed.

• Progress in Superconductivity and Cryogenics
• /
• v.9 no.2
• /
• pp.35-38
• /
• 2007

A single-stage and two-stage pulse tube refrigerators have been designed for cryopump application. The different diameters of pulse tube and regenerator have been investigated at single-stage pulse tube refrigerator(PTR). Experiments have been performed on single-stage PTR to reach minimum temperature with optimum valve opening at a few frequencies. And the two-stage pulse tube refrigerators have been assembled with tested single-stage pulse tube and tested. When orifice turn is opened to 9 and double inlet is opened to 3 at a single-stage, the lowest temperature of 33.7 K is achieved. The cooling capacity at single-stage is 38 W at temperature of 80 K. A two-stage pulse tube refrigerator has 16.3K at the second stage and 59.7K at the first stage. The cooling capacity achieved is 16.5 W at 80 K, the first stage and 0.6 W at 20 K, the second stage. Some details on the design of pulse tube refrigerator and the experimental apparatus are given.

• The Journal of the Korean bone and joint tumor society
• /
• v.9 no.2
• /
• pp.131-138
• /
• 2003

Purpose: We analyzed our malignant peripheral nerve sheath tumor (MPNST) cases to find out their oncologic results following by each treatment modalities. Materials and Methods: Thirty four patients with MPNST were registered in Korea Cancer Center Hospital from Feb. 1986 to Nov. 1996. Seventeen cases were male and 17, female. Average age was 41 years (range 18 to 74). Location of the tumor was as follows; 17 in lower extremity, 11 upper extremity, 4 trunk, and 2 retroperitoneum. Following the AJC classification, stage IA were 2 cases, stage IIA 2, stage IIB 6, stage III 16 and stage IV 8. Twenty six patients took operations and adjuvant chemotherapy and/or radiation therapy, 3 operation only and 3 adjuvant chemotherapy or radiation therapy. Average follow up period was 33.5 months (5.6 to 146.1). Kaplan-Meiyer method was done for survival curve, and log rank test for comparison analysis. Results: Fourteen cases were continuous disease free, 2 no evidence of disease, 2 alive with disease and 14 dead of disease states at final follow up. Actual 5-year and 10-year survival rates were 53.5%, 35.7%. Local recurrence rate after operation was 24.1%. 5-year survival rates of stage I/II/III were 100/85.7/55.9% and 2-year survival rate of stage IV was 14.3% (p=0.04). In 21 cases operated with stage II-III, wide margin (15cases) had 76.0% 5-year survival rate, and marginal or intralesional marigin (6cases) had 40.0%. The actual 5-year survival rate of the group which were done 4 or more cycles chemotherapy (8cases) was 71.4% and the actual 3-year survival rate less than 4cycles chemotherapy (6cases) was 83.3% (p=0.96). In 19 cases operated with stage II-III and which had no radiotherapy, marginal or intralesional margin (5cases) had 3 cases of local recurrences (60.0%), though wide margin (14cases) had 4 cases recurrences (28.6%). There was no local recurrence in 8cases which had pre-or post-operative radiotherapy. Conclusions: Surgical margin is an important factor in local recurrence. Resection margin has a tendency to influence the survival despite insufficient statistical significance. Conventional chemotherapy has no defnite statistical sigficance in the effect on local control and survival. Preoperative and postoperative radiotherapy has some positive effect on local control.

• The Korean Journal of Malacology
• /
• v.9 no.2
• /
• pp.1-15
• /
• 1993

The reproductive ecology of the purple shell, Rapana venosa was investigated by the histological observations on depositions of the egg capsules, and hatching of larvae in the laboratory and the subtidal zone of the vicinity of piung-do, Chollabud-do, west coast of korea, for one year from June 1992 to May 1993. The results are summarized as follows:1. Rapana venosa is dioecious in sex. The ovary is composed of a number of ovarian lobules, and the testis comprises a number of ovarian lobules, and the testis comprises of gonads could be classified into 4 stages in males and 5 stages in females: 1) growing stage(in female subdivided into 2 stages of early and late growing stage). 2)mature stage. 3)spent stage or copulationstage. 4)rdcovering stage. The early growing stage in females of the purple shell was in September through February, late gorwing stage was in October to March, mature stage was in September to January, mature stage was in September to July, copulation stage was in Februaty to June and recovering stage in April to October.3. Spawning occurred 3-4 times at intervals of 1-3 days, and completed within 10 days from the beginning of spawning during the spawning season of the year.4. From the results of laboratory and field observations, egg masses are composed of a number of egg capsules, egg masses are occurred from May to late August, and in mid August depositions of egg mass in composed of 90-113 egg capsules, fecundity in an egg capsule was ranged 984 to 1,241 eggs(average 1,096 egg). Therefore, fecundity in total egg capsules spawned per individual during the spawning season is estimated as approximately 320,000 to 450,000 egges.5. The incubation period during deposition of an egg capsule to hatching larvad tood 17 days at 18.3-20.4%C(water temperature)and 1.021 (specific gravity fo sea water).

• Advances in pediatric surgery
• /
• v.11 no.2
• /
• pp.99-106
• /
• 2005

Neuroblastoma treatment remains challenging, but treatment has become more effective due to the establishment of clinical and biological variables that determine prognostic risks. Initially, stage and age were the prime determinants of survival used in clinical practice. Risk-based therapy currently is the hallmark of neuroblastoma treatment. This study reviews one center's experience with the management of neuroblastoma. Sixty-three patients with neuroblastoma were treated from 1989 to 2003. All patients were graded according to the International Neuroblastoma Staging System (INSS) at diagnosis. There were 37 boys and 26 girls. The median age was 2.14 years (range, 33 days-10.2years). The primary site was the adrenal gland in 47, dumbbell shape extending into spinal canal in 6, retroperitoneum in 5, mediastinum in 3, and other sites in 2. The probability of 5-year overall survival (OS) and event free survival (EFS) were 46.7 % and 44.2 % by Kaplan-Meier method. According to INSS, there were stage 1 in 2 cases, stage 2 in 5, stage 3 in 12, stage 4 in 42, and stage 4s in 2. There were statistically significant differences in the survival rates between patients with stage1, 2 and stage 3, 4(P<0.05). For the stage 3 and 4, the extents of surgical resection, determined from the operative records and pathologies, were complete resection in 17 cases, minimal residual in 15, and partial resection 11, and the 5-year OS rate was 57.8, 51.4, and 13.6 %, respectively. There is a trend toward higher OS with more complete resection (P<0.05). We conclude that age and stage at diagnosis are prognostic factors, and complete excision of the primary tumor can provide better prognosis for patients with stage 3 and 4 neuroblastoma.