펄스정전응력법을 이용한 고분자 재료에서 공간전하분표 측정에 대한 이론적 고찰

황보승 호남대학교 산업기술연구소 1998 산업기술연구논문집 Vol.6 No.-

본 논문에서는 최근 국 ·내외적으로 활발하게 연구되고 있는 고체 고분자 재료 내의 공간전하 측정법과 관련하여, 공간전하의 비파괴 측정법 중의 하나인 펄스정전응력법(PEA 법)에 대한 이론적 고찰을 수행하였다. 또한, 두꺼운 압전소자를 이용해서 PEA 법의 공간분해능을 향상시킬 수 있는 새로운 방법을 제안하였다. In this paper, we have evaluated theoretically the PEA method which is one of the most popular methods for the nondestructive measurement of space charge distribution in polymers. On the basis of this theoretical evaluation, we also suggest a new measuring method that uses a thick piexo-material for improving the space resolution of PEA method.

경제적 형광등 교체를 위한 표시장치 개발에 대한 연구

황보승 호남대학교 산업기술연구소 1999 산업기술연구논문집 Vol.7 No.-

본 논문에서는 현재까지 광원의 주류를 이루고 있는 형광등에 의한 불필요한 전력소모를 억제하고 전기요금을 절약하기 위한 최적의 형광등 교체주기 표시에 대한 연구를 수행하였다. 이를 위하여 본 연구에서는 시간경과에 따른 형광등 노화에 의한 소모전력의 증가와 그에 따른 경제성을 분석하였으며, 이를 바탕으로 최적의 교환시기가 되면 자동으로 적색 LED가 소등(또는 점등)되는 장치를 설계 및 개발하였다. 또한 P-spice를 통한 회로 해석과 실험을 통하여 개발된 장치의 정상적인 동작을 확인하였다. In this paper, in order to restrict the power consumption and save electric charges due to the fluorescent lamp which is still main lighting source, we have carried out the studies on the indicating the optimal replacement time of it. For these purposes, we have evaluated the increment of power consumption of the fluorescent lamp and its economical efficiency due to degradation according to elapsed time. On the basis of the evaluation, we have designed and developed the system that turned off(or on) the red LED at the optimal replacement time. We also verified correct operations of the developed system through the circuit simulation by P-spice and experiments.

펄스정전응력법(PEA)을 이용한 고분자 재료애 따른 공간전하분포와 전도전류 특성

황보승 호남대학교 1999 호남대학교 학술논문집 Vol.20 No.2

The purpose of this paper is to evaluate the effects of space charge on electrical characteristics in polymer insulators, which has been studied by many researchers in the world recently. In this paper, we have manufactured new measurement system which measured simultaneously both space charge distribution and conduction current. By using this system, we have analyzed the effects of space charge on conduction characteristics of polymer insulators such as XLPE and WTR-XLPE under DC voltage. We could find that the characteristics of polymer insulators have good correlation with space charge distribution in polymer insulators.

펄스정전응력법에 의한 XLPE에서 DC 과전에 의한 공간전하의 교류전압에서의 거동관찰

황보승 호남대학교 2000 호남대학교 학술논문집 Vol.21 No.2

In this paper, in order to evaluate quantitavely the formation mechanism of space charge by DC application and the behavior of pre-formed space charge at AC volatge in XLPE, We have modified the PEA method to measure simultaneously discharging (or leakage) current and space charge distribution under DC and AC. By using this system, we have analyzed the effects of pre-formed space charge accumulated by DC stress on AC in XLPE (560 ㎛) when there is no air gap between electrode and XLPE. Form the experimental, it was found that, DC conduction current decrease because of the effects of potential barrier at interface and most of pre-formed space charges still remained when AC voltage was applied up to 8kV. Thus the field distortion and localization due to pre-formed space charge is very important under AC voltage and may cause a critical damage on the AC insulating characteristics of insulator, especially in AC long-term service.

성인 남자의 식습관과 혈중 지질 농도에 관한 연구

신승렬,황보진향,박동철 慶山大學校 1997 論文集 Vol.15 No.1

This paper was carried out to study on the food & daily habit score and lipid contents in serum of adult man as basal research for research on the effects of food & daily habits on the lipid contents in serum of adult man. The number of normal, dangerous leval and hypercholesterolemia was each 133(60.5%), 62(28.2%) and 25(11.3%) of adult man. respectively. The mean age. weight. Broca's index(RBW) and Quetelet index(BMI) was 48.4 9.5. 67.7 10.2. 109.1 14.3, 23.6 3.0. respectively. The numbers of good food habits was 5.4 percentage, but those of bad food habits was 35.5 percentage, It was appeared to bad the mode of dietary and hormony of food. The contents of trigryceride and cholesterol in serum was 115.8 and 192.4mg/dℓ, respectively. The numbers of triglyceride contents(90∼120mg/dℓ in serum was 53(24.1%) of the subjects of research, and those of triglyceride contents (150-210mg/dℓ) in serum was 133(60.5%) of the adult man.

대학생의 취업스트레스와 자아존중감, 자아효능감, 외모관리행동의 관계

김보라,김유진,김지희,노혜진,오승희,홍지혜,황윤희,박선아 水原大學校 2016 論文集 Vol.30 No.-

Purpose: Many university students are under a lot of job-seeking stress because the employment rate is low. This study sought to determine the relationship between job-seeking stress, self esteem, self efficacy and appearance management behavior amongst university students focusing on nursing. Methods: This descriptive correlational study evaluated the relationships between job-seeking stress, self esteem, self efficacy and appearance management behavior of 340 university students was conducted between September 1 and October 5, 2015. Results: The correlational analysis between job-seeking stress, self esteem, self efficacy and appearance management behavior revealed a negative correlation between job-seeking stress, self esteem and self efficacy and a positive correlation between job-seeking stress and appearance management behavior. In addition, age also correlated with self esteem, self efficacy and appearance management behavior. Conclusion: Stress correlated with self esteem and self efficacy and appearance management behavior. Therefore job-seeking stress may be reduced through not only self esteem and self efficacy enhancement programs but also management according to age.

산성강하물의 침착량과 동태 해명에 관한 연구 -춘천과 서울 강우의 화학조성 비교 : Comparison of Chemical Composition of Rain Water between Chunchon and Seoul

김만구,강미희,임양석,박기준,황훈,이보경,홍승희,이동수 江原大學校 附設 環境硏究所 1999 環境硏究 Vol.16 No.-

The rain water samples were collected at Chunchon and Seoul by using wet only automatic sampler from January 1996 through December 1997. The daily base rain water samples collected over than 95% rainy events during the whole period. The samples were measured both pH and conductivity, and were analysed major ionic components, SO₄^(2-), NO₃^(-), Cl^(-), NH₄^(+), Ca^(2+), Na^(+) and K ^(+), by ion chromatography. In 1996, about 77% sampled rain water showed below pH 5.6 and the 60% of rain water was lower than pH 5.0. The volume weighted average pH was 4.7 at all sites. In 1997, the volume weighted average pH was 4.6 and 4.9 at Seoul and Chunchon, respectively. Among the rain water samples, 87% and 55% of samples showed below than pH 5.6 and 5.0, respectively. The pH value of Chunchon was significantly (p<0.05) lower than Seoul at the rain samples for less than 20 ㎜ rainfall. However conductivity of the rain samples were 20.9 μS/㎝ for 1996 and 27.7 μS/㎝ for 1997 at Seoul, and 19.1 μS/㎝ for 1996 and 14.1 μS/㎝ for 1997 at Chunchon. H₂SO₄AND HNO₃CONTRIBUTED 65.9% and 29.6% of free acidity at Seoul, respectively. The ratio of [NO₃^(-)]/[nss-SO₄^(2-)] were 0.43 at Seoul and 0.51 at Chunchon for rain samples for less than 20 ㎜ rainfall. The annual wet deposition of Cl^(-), NO₃^(-), SO₄^(2-), H^(+), Na^(+), NH₄^(+), K ^(+), Mg^(2+) and Ca^(2+), respectively, 568.8 ㎏/㎢, 1489.3 ㎏/㎢, 3184.8 ㎏/㎢, 20.9 ㎏/㎢, 249.4 ㎏/㎢, 1091.2 ㎏/㎢, 189.8 ㎏/㎢, 90.2 ㎏/㎢, and 702.4 ㎏/㎢ at Seoul for 1996; 656.4 ㎏/㎢, 2029.7 ㎏/㎢, 3280.7 ㎏/㎢,27.2 ㎏/㎢, 229.4 ㎏/㎢, 1063.9 ㎏/㎢, 106.9 ㎏/㎢, 7802 ㎏/㎢, and 645.3 ㎏/㎢, at Seoul for 1997; 116.9 ㎏/㎢, 983.3 ㎏/㎢, 1797.0 ㎏/㎢, 21.4 ㎏/㎢, 83.2 ㎏/㎢, 648.1 ㎏/㎢, 78.0 ㎏/㎢, 22.2 ㎏/㎢ and 368.8 ㎏/㎢ at Chunchon for 1996; 100.2 ㎏/㎢, 1077.6 ㎏/㎢, 1754.0 ㎏/㎢, 13.4 ㎏/㎢, 146.0 ㎏/㎢, 602.3 ㎏/㎢, 88.8 ㎏/㎢, 16.2 ㎏/㎢ and 206.8 ㎏/㎢ at Chunchon for 1997.

Evaluation of a Standardized Extract from <i> Morus alba</i> against <i>α</i> -Glucosidase Inhibitory Effect and Postprandial Antihyperglycemic in Patients with Impaired Glucose Tolerance: A Randomized Double-Blind Clinical Trial

Hwang, Seung Hwan,Li, Hong Mei,Lim, Soon Sung,Wang, Zhiqiang,Hong, Jae-Seung,Huang, Bo Hindawi Publishing Corporation 2016 Evidence-based Complementary and Alternative Medic Vol.2016 No.-

<P>To evaluate the antihyperglycemic effect of a standardized extract of the leaves of<I> Morus alba</I> (SEMA), the present study was designed to investigate the <I>α</I>-glucosidase inhibitory effect and acute single oral toxicity as well as evaluate blood glucose reduction in animals and in patients with impaired glucose tolerance in a randomized double-blind clinical trial. SEMA was found to inhibit <I>α</I>-glucosidase at a fourfold higher level than the positive control (acarbose), in a concentration-dependent manner. Moreover, blood glucose concentration was suppressed by SEMA<I> in vivo</I>. Clinical signs and weight changes were observed when conducting an evaluation of the acute toxicity of SEMA through a single-time administration, with clinical observation conducted more than once each day. After administration of the SEMA, observation was for 14 days; all of the animals did not die and did not show any abnormal symptoms. In addition, the inhibitory effects of rice coated with SEMA were evaluated in a group of impaired glucose tolerance patients on postprandial glucose and a group of normal persons, and results showed that SEMA had a clear inhibitory effect on postprandial hyperglycemia in both groups. Overall, SEMA showed excellent potential in the present study as a material for improving postprandial hyperglycemia.</P>

남북관광산업의 경제교류협력 활성화 요인 연구

황보승 ( Bo Seung Hwang ) 관광경영학회 2005 관광경영연구 Vol.24 No.-

노드 이동성을 고려한 계층적 이동 IPv6 네트워크에서의 적응적 경로 최적화 방안

황승희(Seung-Hee Hwang),이보경(Bo-Kyung Lee),황종선(Chong-Sun Hwang),한연희(Youn-Hee Han) 한국정보과학회 2003 정보과학회논문지 : 정보통신 Vol.30 No.4

인터넷 관련 국제 표준화 기구인 Internet Engineering Task Force(IETF)에서는 이동 환경에서의 인터넷 사용을 위한 Mobile IPv6 프로토콜을 제안하였으며 이에 대한 많은 연구가 진행되고 있다. 경로 최적화를 기본 원칙으로 하는 Mobile IPv6은 최적화된 경로를 따라 이동노드로 패킷의 전달을 가능하게 하지만 이를 위해서 이동 노드들은 이동시마다 자신의 위치를 HA(Home Agent)나 CN(Correspondent Node)에게 알려야 한다. 만일 빈번하게 이동하는 노드는 그 만큼 자주 위치갱신 및 등록 작업을 수행하여야 한다. 이를 보완하기 위하여 계층적 기법들이 제안되었다. 즉, 계층적 기법들은 중간 이동성 에이전트를 두어 매크로 이동성과 마이크로 이동성을 분리하여 지역성을 이용한다. 그러나 이런 계층적 기법들은 패킷 전송에 있어서 경로 최적화를 보장하지 못한다. 따라서 CN에서 이동 노드를 향하는 모든 패킷들은 반드시 중간 이동성 에이전트를 통과하여야 한다. 이는 중간 이동성 에이전트에 패킷집중과 불필요한 패킷 지연을 초래하게 된다. 이에 본 논문에서는 이 중간 이동성 에이전트의 패킷 집중을 완화시키고, 패킷의 지연을 줄이기 위한 기법을 제안하고자 한다. 이를 위해 기존의 계층 기법에 프로파일의 개념을 도입한다. 프로파일은 각 서브넷에서의 이동노드의 상주시간에 대한 기록을 보유하고 있으며 이 프로파일을 이용하여 중간 이동성 에이전트가 패킷 전송을 위해 기존의 패킷 전송 경로와 최적화된 경로 중에서이동노드에 적절한 위치정보를 CN들에게 알린다. 이렇게 함으로서 제안 기법은 최적화된 경로로 패킷을 전송할 수 있으므로 중간 이동성 에이전트로의 패킷 집중을 완화시키고, 이에 따르는 불필요한 패킷 지연을 완화시킬 수 있다. The secret sharing is the basic concept of the threshold cryptosystem and has an important position in the modern cryptography. At 1995, Jarecki proposed the proactive secret sharing to be a solution of existing the mobile adversary and also proposed the share renewal scheme forthreshold scheme. For n participants in the protocol, his method needsmodular exponentiation per one participant. It is very high computational cost and is not fit for the scalable cryptosystem. In this paper, we propose the efficient share renewal scheme that need onlymodular exponentiation per participant. And we prove our scheme is secure if less thanadversaries exist and they are static adversary.