• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2007.06a
• /
• pp.227-228
• /
• 2007

Although many studies have been carried out about binary gas mixtures with $SF_6$, few studies were presented about breakdown characteristics of $SF_6/CF_4$ mixtures. At present study the breakdown characteristics of SFJCF4 mixtures in uniform field was performed. The experiments were carried out under AC and standard lightning impulse (SLI) voltages. The sphere-sphere electrode whose gap distance was 1 mm was used in a test chamber. $SF_6/CF_4$ mixtures contained from 0 to 100% $SF_6$ and the experimental gas pressure ranged from 0.1 to 0.4 MPa. The results show that addition of $SF_6$ to $CF_4$ increase AC and SLI breakdown voltages. Under AC voltages the breakdown voltages of each mixture were linearly increased according to the quantity of $SF_6$. However under SLI voltages the breakdown voltages of each mixture were similar.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2002.11a
• /
• pp.652-655
• /
• 2002

The next generation Internet Protocol IPv6 that is appeared to solve the exhausting problem is now widely deployed in a testbed or commercial site. To successfully deploy IPv6, interoperation with exist IPv4 hosts and routers and interactions with many IPv4 applications are more important. The NAT-PT (Network Address Translation-Protocol Translation) among IPv6 transition mechanism enables the communication between IPv4 and IPv6 host with translating IPv4 address and IPv6 address. But for DNS and FTP, another specific mechanism is needed when internet address is included in packet payload area. This paper describes the design and implementation of IPv6-support FTP-ALG, (Application Layer Gateway) to enable FTP service between IPv4 node and IPv6 node.

• The Korean Journal of Ecology
• /
• v.15 no.4
• /
• pp.355-363
• /
• 1992

Nitrate reductase activity(NRA) and induced NRA were compared in 4 species of moss ctenidium molluscum, homalothecium, tortella tortusa and neckera crispa collected from limestone in england. the NRA and dry weight of the c. molluscum were also measured after spraying with acidic deposition adjusted to ph 5.6, 4.6, 3.6 and 2.8 with one of two molar ratios of nitric to sulfuric acid, i.e. 1:0(N alone) and 1:2(1N+2S) for 20 days. All 4 species showed high NR leavels in the upper part of cut shoots and occurred maximum inducation of NRA within 6h. c. molluscum had the highest NRA levels among 4 species. after daily spraying of acidic deposition, NRA of c. molluscum was increased much more largely at ph 6 and ph 3.6 derived from N alone than from 1N+2S. However that was decreased at ph 2.8 derived both from N alone and 1N+2S . Decline of dry weight had occurred at ph 3.6 and 2.8 derived both from N alone and 1N+2S. Whereas substantial fertilization effect was observed at ph 4.6 derived from N alone. the data suggest that c. molluscum are able to utilize nitrate more effectivery than any other species, and NRA induction are more sensitive than growth response to nitrogen content of acidicdeposition in a short- term. however toxic effects was detected at high $NO_3$ supply and low phacidic deposition.

• 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 the Korean Home Economics Association
• /
• v.34 no.4
• /
• pp.49-62
• /
• 1996

This paper is to examine the development of Korean young children's judgement on moral and conventional rules. The subjects are 120 children, 30 each at four age levels; age 3(2.8-3.5), age 4(3.7-4.4), age 5(4.8-5.5), and age 6(5.7-6.5) in a day care center in Taegu. Results are summarized as follows: 1. In terms of nonpermissibility, there was a significant difference in regard to the moral and the conventional rule transgression between the group of age 3 years and three groups of ages 4, 5, and 6. 2. In terms of seriousness, there was a significant difference according to domain. Three groups ages 4, 5 and 6 years evaluate moral transgressions to be more serious than conventional transgressions. 3. In terms of rule contingency and generalizability, there was a significant difference in regard to the moral and conventional transgression between the group of age 3 years and three groups of ages 4, 5 and 6. 4. In terms of punishment, there was significant difference according to domain. Three groups of age 4, 5, and 6 years evaluate moral transgressions to be more punishable than conventional transgressions. 5. Children of age 5 with institutional experience do not make a distinction between moral and conventional rules on punishment criterion.

• Women's Health Nursing
• /
• v.8 no.2
• /
• pp.244-256
• /
• 2002

The purpose of this study was to examine the effects on labor pain and duration of delivery time for primipara women treated by San-Yin-Jiao(SP-6) and Hob-Gog(LI-4) acupressure. The design of this study was a nonequivalent control group non-synchronizedpost test only design. It was done to identify the effects of SP-6 acupressure or LI-4 acupressure on labor pain in primipara women. The benefits of using SP-6 acupressure or LI-4 acupressure were evaluated by comparing three groups, a SP-6 acupressure group, a LI-4 acupressure group and a control group, not treated with acupressure. The participants included 192 primiparas who underwent vaginal delivery, 72 primiparas in the control group, 71 in the SP-6 acupressure group and 49 in the LI-4 acupressure group. Data were collected using a structured questionnaire consisting of general characteristics, a subjective labor pain scale (Johnson, 1974), and measurement of duration of delivery time. The results of this study are summarized as follows : 1. Differences in the acupressure effect for SP-6 and LI-4 were analyzed using Scheffe's test which showed that differences in the control group vs the SP-6 group and the control group vs the LI-4 group were statistically significant (t=21.767, p<0.05; t=23.923, p<0.05), but the SP-6 group vs the LI-4 group showed no significant differences. 2. The duration of delivery time in the group which had SP-6 acupressure or LI-4 acupressure was shorter (400.77${\pm}$153.34; 379.10${\pm}$127.60) than in the control group (528.68${\pm}$239.08). Differences in the effects of acupressure with SP-6 and LI-4 were also analyzed by Scheffe's test. Control group vs SP-6 group and Control group vs LI-4 group were significantly different(t=127.91, p<0.05; t=149.58, p<0.05), but the SP-6 group vs the LI-4 group did not show any statistically significant difference (t=21.67). This study has shown that SP-6 and LI-4 acupressure were both effective in relation to labor pain and duration of delivery time for primiparas. But it is necessary to replicate the study with a larger number of participants to generalize of the results.

• BMB Reports
• /
• v.32 no.6
• /
• pp.554-560
• /
• 1999

TTD1BI cells are non-hypersensitive to UV irradiation and perform normal genome repair of pyrimidine dimers but fail to excise 6-4 photoproducts and, concomitantly, are unable to restore RNA synthesis levels following UV irradiation. This pointed to a detect in gene-specific repair and this study was undertaken to examine repair of 6-4 photoproducts at the gene-level. The results indicated a defect in gene-specific repair of 6-4 photoproducts in active genes, although strand-specificity of 6-4 photoproduct removal was essentially similar to that of normal cells. These findings indicate that the near normal UV resistance of TTD1BI cells may be due to the inability of these cells to remove DNA lesions preferentially, as well as to the cells opting out of the cell cycle to repair damage before resuming replication.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.49 no.6
• /
• pp.468-471
• /
• 2004

Tocotrienol $(T_3)$ and tocopherol (T) are well-known antioxidant vitamin E isomers that are enriched in rice bran, most of which is removed during polishing process. To verify the polishing-dependent fractional content of tocotrienol and tocopherol, harvested brown rice of 4 cultivars were polished by 4.0, 6.4, 8.0, 9.6, and $12\%$ (w/w) and resultant bran powder and rice were used for $T_3$ and T analysis. Polishing degree affected bran $T_3$ content in that bran polished by $6.4\%$ exhibited highest $T_3$ content compared to other polishing degrees except in cv. Chucheongbyeo which showed similar $T_3$ content from 4.0 to $8.0\%$ polishing. In case of tocopherol, bran polished by $8.0\%$ exhibited highest T content in all tested cultivars. In general, $T_3$ distributed in higher quantity in exterior i.e., in less polished bran, while T showed relatively less decrease with enhanced polishing degree. Consequently, total vitamin E content in bran as calculated by the summation of $T_3$ and T became less dependent on polishing degree in that bran polished between 6.4 to $9.6\%$ exhibited no statistical differences. The rice of cv. Chuchongbyeo, remained after polishing, exhibited similar vitamin E content up to $6.4\%$ polishing, above which significant vit E loss could be observed. These results suggest that polishing less than $6.4\%$ is desirable to minimize the loss of tocotrienols and tocopherols during polishing.

• The Journal of Internal Korean Medicine
• /
• v.34 no.4
• /
• pp.375-383
• /
• 2013

Objectives : This study was performed to investigate the metabolic site of some medicinal herbs in the liver associated with CYP (Cytochrome P450). Methods : Cytochrome P450 is the major enzymes involved in drug metabolism and bioactivation. CYP3A4 and CYP2D6, the major CYP isoforms in humans, catalyse the major proportion of drugs available on the market. Scintillation proximity assay (SPA) is often used in studies to identify compounds that inhibit CYP3A4 and CYP2D6. 28 herbal extracts and radioisotopes were attached competitively to SPA beads, and followed by measuring the remaining radioisotopes in the medium. Erythromycin and dexamethasone, inhibitors of CYP3A4 and CYP2D6, were used as controls respectively. Results : Most of the 28 herbal extracts showed dose-dependent affinity to the CYP3A4 while some of the herbs showed affinity to the CYP2D6. Conclusions : These results suggest that most of the 28 herbal extracts are metabolized safely in the liver, combined with CYP3A4 and CYP2D6.

• Journal of KIISE:Information Networking
• /
• v.34 no.1
• /
• pp.16-26
• /
• 2007

It is well known that, in the near future, the lifetime of the IPv4 address space will be limited and available 32-bit IP network addresses will not be left my more. In order to solve such IPv4 address space problem in an effective way, the transition to the new version using IPv6 architecture is inevitably required. This paper presents the design and implementation of IPv4/IPv6 dual stack at the GSM Phone based on Linux Kernel 2.4 IPv6 Protocol Stack. It designs appropriately in GSM Phone environment and it is tested by a network of Linux IPv4/IPv6 dual stack on PPP. The test was processed with a test scenario and it was found that the results were successful.