시멘트 제조사 및 W/C 변화에 따른 콘크리트의 초기 강도발현 특성

金光華,裵正烈,김규도,이승훈,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

This study is to investigate the influence of cement manufacturing company and W/C on the properties of fresh concrete, strength of hardened concrete and rebound value of P type Schmidt hammer. According to the result, setting time of concrete is shortened with and increase of W/C, and when cement made in A and B corporation is used in concrete, the final setting time is measured at about 10 hours and 13 hours. Compressive strength increases with elapse of time and decrease of W/C, and concrete using cement made in A corporation shows higher compressive strength and rebound value until 24 hours, but from 3rd day, the contrary tendency is shown. As for the properties of early strength, the strength develop fast with decrease of W/C, and the time when compressive strength of 5MPa is gained and the form can be removed, is about 15, 18, 21 hours and 20, 22, 27 hours at the W/C 40, 45, 50% in concrete using cement made in A and B Co. respectively. The correlativity between compressive strength and the rebound value, which a coefficient of correlation is over 0.97, is very favorable. Therefore this method is effective to estimate the strength of removing the form.

Gemcitabine in Treating Patients with Refractory or Relapsed Multiple Myeloma

Zheng, Hua,Yang, Fan Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.21

Background: Patients with refractory or relapsed multiple myeloma are considered to have a very poor prognosis, and new regimens are needed to improve the outcome. Gemcitabine, a nucleoside antimetabolite, is an analog of deoxycytidine which mainly inhibits DNA synthesis through interfering with DNA chain elongation and depleting deoxynucleotide stores, resulting in gemcitabine-induced cell death. Here we performed a systemic analysis to evaluate gemcitabine based chemotherapy as salvage treatment for patients with refractory and relapsed multiple myeloma. Methods: Clinical studies evaluating the impact of gemcitabine based regimens on response and safety for patients with refractory and relapsed multiple myeloma were identified by using a predefined search strategy. Pooled response rate (RR) of treatment were calculated. Results: In gemcitabine based regimens, 3 clinical studies which including 57 patients with refractory and relapsed multiple myeloma were considered eligible for inclusion. Systemic analysis suggested that, in all patients, pooled RR was 15.7% (9/57) in gemcitabine based regimens. Major adverse effects were hematologic toxicity, including grade 3 or 4 anemia, leucopenia and thrombocytopenia i. No treatment related death occurred with gemcitabine based treatment. Conclusion: This systemic analysis suggests that gemcitabine based regimens are associated with mild activity with good tolerability in treating patients with refractory or relapsed multiple myeloma.

A Case Study of Economic Infographic by Beautiful Visualization Method

Hua Zheng-yang,Kim Se-hwa 한국콘텐츠학회 2012 한국콘텐츠학회 종합학술대회 논문집 Vol.2012 No.5

Performance of modified graphite as anode material for lithium-ion secondary battery

Hua Zheng,Myung-Soo Kim 한국탄소학회 2011 Carbon Letters Vol.12 No.4

Two different types of graphite, such as flake graphite (FG) and spherical graphite (SG), were used as anode materials for a lithium-ion secondary battery in order to investigate their electrochemical performance. The FG particles were prepared by pulverizing natural graphite with a planetary mill. The SG particles were treated by immersing them in acid solutions or mixing them with various carbon additives. With a longer milling time, the particle size of the FG decreased. Since smaller particles allow more exposure of the edge planes toward the electrolyte, it could be possible for the FG anodes with longer milling time to deliver high reversible capacity; however, their initial efficiency was found to have decreased. The initial efficiency of SG anodes with acid treatments was about 90%, showing an over 20% higher value than that of FG anodes. With acid treatment, the discharge rate capability and the initial efficiency improved slightly. The electrochemical properties of the SG anodes improved slightly with carbon additives such as acetylene black (AB), Super P, Ketjen black, and carbon nanotubes. Furthermore, the cyclability was much improved due to the effect of the conductive bridge made by carbon additives such as AB and Super P.

Intranasally Administered Adjunctive Dexmedetomidine Reduces Perioperative Anesthetic Requirements in General Anesthesia

Zheng Chen,Xiang Wu,Li-Hua Hang,Hong Wang,Dong-Hua Shao,Yi-Guo Xu,Wei Cui 연세대학교의과대학 2016 Yonsei medical journal Vol.57 No.4

Purpose: Intranasal dexmedetomidine is an effective sedative for premedication and is regularly used to reduce preoperative tension and anxiety in children. This study aimed to assess the effect of intranasally adjunctive dexmedetomidine on perioperativesedative and analgesic requirements in adults. Materials and Methods: Patients were randomly divided into four groups to receive preoperative administration of saline, intranasaldexmedetomidine 1 μg/kg and 2 μg/kg, and intravenous dexmedetomidine 1 μg/kg, respectively. Propofol and remifentanil were target-controlled infused to maintain intraoperative bispectral index at 45–55 and blood pressure at baseline value±20%. Sufentanil was administered to maintain postoperative visual analogue scale ≤3. Perioperative anesthetics requirements were compared using nonparametric tests. Results: Intranasal dexmedetomidine significantly attenuated propofol requirements for anesthesia induction and maintenance in a dose-dependent manner. Patients given intranasal dexmedetomidine 2 μg/kg required less remifentanil for anesthesia maintenance. The first postoperative request for sufentanil analgesia was delayed in patients given intranasal dexmedetomidine 2 μg/kg. The anesthetics-sparing effect of intranasal dexmedetomidine was significantly weaker than intravenous dexmedetomidine at the same dose of 1 μg/kg. The incidences of adverse events, including hemodynamic instability and delayed recovery, were comparablewith and without intranasal dexmedetomidine. Conclusion: Intranasal administration of dexmedetomidine can reduce perioperative anesthetic requirements, and a dose of dexmedetomidine 2 μg/kg produces a better effect in adults. The anesthetics-sparing effect of intranasal dexmedetomidine 1 μg/kg is less than that with the same intravenous dose of dexmedetomidine.

The Study about the Bluetooth Communication

Zheng hua Song,Hyun sik Shin,Chun Suk Kim 한국전자통신학회 2007 한국전자통신학회 논문지 Vol.2 No.3

Bluetooth is a standard for short range, low power, low cost wireless communication that uses radio technology. This paper presents an overview of Bluetooth communication the following article will focus on the formation of Bluetooth scatter nets and some proposed scatter net models.

Study on the Legal Issues of the jurisdiction to arrest ships and the substantive jurisdiction of maritime case

Zheng Hua,지상규 사단법인 한국법이론실무학회 2023 법률실무연구 Vol.11 No.1

Arrest of ships is one of the most distinctive legal systems in the maritime field. In the process of arresting ships, there may be two kinds of jurisdictions involved, one is the jurisdiction to arrest ships, and the other is the substantive jurisdiction of maritime case. There are different view in common law and civil law countries as to "whether the court arresting a ship can acquire the substantive jurisdiction of maritime case because of the arrest of the ship involved".In order to coordinate the differences between the two legal systems on this issue,<International Convention Relating to the Arrest of Sea-Going Ships 1952>,<Hamburg Rules> and <International Convention on Arrest of Ships 1999> have stipulated the relationship between the jurisdiction to arrest ships and the substantive jurisdiction of maritime case, which has made a positive exploration to ease jurisdictional conflicts of international maritime action. However, due to the limitations of international conventions, legislative differences between different countries and forum shopping of maritime claimant, the jurisdictional conflicts of international maritime action is still serious. This paper analyzes the development history of the relationship between the jurisdiction to arrest ships and the substantive jurisdiction of maritime case by analyzing the international conventions related to the arrest of ships and the legislative status of the common law and civil law countries, and on the basis of the analysis of the legislative and judicial status of the jurisdiction to arrest ships and the substantive jurisdiction of maritime case in China, it makes several suggestions to improve the jurisdiction to arrest ships and the substantive jurisdiction of maritime case in China, namely, the Chinese courts should adhere to the principle of international comity in the judicial practice of maritime litigation, introduce the doctrine of forum non conveniens into <Special Maritime Procedure Law of the People's Republic of China>, and strengthen international judicial cooperation, in order to ease the jurisdictional conflicts between countries.

Assessing the attention of attraction for user cognition by info-graphic design

Hua Zheng Yang(양정화),Kim Se-hwa(김세화) 한국콘텐츠학회 2013 한국콘텐츠학회 종합학술대회 논문집 Vol.2013 No.5

다시마의 혐기성 소화에서 유기물 부하와 수리학적 체류시간의 영향 분석

Zheng Hua Piao,Xin Zhao,이종근,김재영 한국폐기물자원순환학회 2014 한국폐기물자원순환학회지 Vol.31 No.5

Seaweeds are received high attending as one of new and renewable energy sources. In this study, the effects of organic loading rate (OLR) and hydraulic retention time (HRT) on anaerobic digestion with Laminaria japonica were investigated using labrotory-scale semi-continuous stirred type reactors. The results demonstrated that anaerobic digestion of Laminaria japonica performed stably with OLRs in the range of 1.00 ~ 1.50 g-VS/L·d and HRTs in the range of 27 ~ 40 days. The maximum methane production obtained was 251.33 mL-CH4/L·d, which was achieved for an OLR of 1.50 g-VS/L·d and a HRT of 27 days. However, an OLR of 1.75 g-VS/L·d and a HRT of 23 days brought about a decrease in the pH and volatile fatty acids (VFAs) accumulation, causing the destabilization of the reactor and process failure. The reactors operated at a constant influent substrate concentration, i.e., 40 g-VS/L, thus OLR and HRT could not be treated separately and independently. According to the limited results of this study, it seems that the suitable OLR of anaerobic digestion of Laminaria japonica was lower than 1.50 g-VS/L·d and suitable HRT was higher than 27 days.

The Practical Application of Bluetooth Media Technology and Outlook for Development

Zheng Hua Song,Hyun Sik Shin,Chun Suk Kim,Yun Ho Shin 한국전자통신학회 2006 한국전자통신학회 논문지 Vol.1 No.1

이 논문은 블루투스 장치의 전 세계적으로 사용되는 무허가 ISM 대역의 2.4GHZ로 동작한다. 이 대역은 널리 사용되고 있지만, 블루투스 이외의 수많은 다른 시스템들이 이 주파수대를 사용하고 있고 마이크 웨이브 오븐과 같은 잡음원이 이 주파수대를 차지하고 있기 때문에 오히려 방해가 심한 주파수 대역이 되고 있다. 블루투스는 이와 같이 방해가 심한 전파환경을 극복하기 위해 빠른 주파수 호핑법과, 에러방지 밎 정정 기술을 사용하고 있다. 이와 같은 상황에도 불구하고, 저가의 블루투스 시스템이 신뢰성 있고 안정하게 하기위해 언급할 몇 가지 중요한 설계 상 문제점이 있고 시스템 설계시 몇 가지 면밀한 주의가 필요하므로 연구하고자 한다. This is paper, with the development of computer and network communications technology, the technology of digital computer and modern communications has integrated into the field of intelligent home appliances, making them intelligentize with the function of a network information terminal. The paper introduces the Bluetooth SIG(Special Interesting Group) and the development of the standard of the Bluetooth. Researches the application model and the practical application of the Bluetooth technology, and the component elements of the Bluetooth. Finally deals with the outlook for the development of the Bluetooth technology.