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Effect of Polyisobutylene and Sealant Treatments on Ethylcellulose-Walled Methyldopa Microcapsules
신상철,고익배,Shin, Sang-Chul,Koh, Ik-Bae 한국약제학회 1989 Journal of Pharmaceutical Investigation Vol.19 No.1
For the prevention of the aggregation during microencapsulation, the effects and role of polyisobutylene(PIB), as a protective colloid, were studied. The effects of sealant treatment on the microencapsulation were studied. Methyldopa was microencapsulated with ethylcellulose (EC) by polymer deposition from cyclohexane by temperature change using PIB. The EC-microencapsulated methyldopa was sealed with spermaceti. The dissolution of methyldopa was influenced by the drug to wall ratio. When PIB was used, low aggregation of microcapsules occurred and the surface was smooth with a few pores. Treatment of microcapsules with spermaceti retarded the release of methyldopa, the release being affected by the percentage of sealant used and the particle size of the product.
신상철,조정원 ( Sang Chul Shin,Cheong Weon Cho ) 한국약제학회 1997 Journal of Pharmaceutical Investigation Vol.27 No.1
N/A Nicotinic acid was mixed with glass powders such as controlled pore glass (CPG), glyceryl controlled pore glass (GPG) and glass beads (GB) at room temperature. The physicochemical properties of nicotinic acid in the various mixtures were examined by differential thermal analysis. X-ray diffraction study. Infrared spectroscopy and BET gas adsorption measurements. The peak area at the melting point from the various mixtures of nicotinic acid and CPG was increased with an increase of nicotinic acid concentration while the broad peak area was remained unchanged in the DTA curve. As shown in the powder X-ray diffraction patterns, the crystalline peaks of nicotinic acid disappeared in mixture with CPG, suggesting the interaction of nicotinic acid and porous powders. It was found that the larger the content of CPG, the higher the ratio of an amorphous state to a crystalline state. BET isotherm showed that as the amount of nicotinic acid was increased, the specific surface area was reduced proportionally to nicotinic acid content of up to 40% and remained constant thereafter. Sublimation of nicotinic acid from the mixture of nicotinic acid and CPG was examined. A large quantity of nicotinic acid was retained in the mixture when stored on various temperatures in vacuo for 10 hours. The nicotinic acid mixtures with CPG or GPG showed a high dissolution rates of nicotinic acid in aqueous solution, especially in the initial dissolution stage. CPG is expected to be a good pharmaceutical excipient to reduce the crystallinity of drugs and to prevent sublimation of drugs.
신상철,고익배,Shin, Sang-Chul,Koh, Ik-Bae 한국약제학회 1991 Journal of Pharmaceutical Investigation Vol.21 No.4
Microencapsulation of sodium ascorbate with cellulose acetate phthalate(CAP) by coacervation/ phase separation method were carried out. Various factors affecting microencapsulation, i.e., surfactant concentration. CAP concentration, stirring speed and treatment of spermaceti as a sealing agent were studied. Dissolution rate. particle size distribution, surface feature and stability test were investigated. CAP microcapsules prepared using 0.5% span 80 as a surfactant showed smooth and round surfaces. The release of sodium ascorbate was retarded by microencapsulation with CAP and by sealant treatment with spermaceti. When triturated with sodium bicarbonate, CAP microcapsules were more stable than unencapsulated sodium ascorbate under various RH conditions at $37^{\circ}C$.
외국인(중국, 베트남, 인도네시아) 선원노동자 근로환경과 범죄에 대한 연구
신상철(Sang Chul Shin) 한국아시아학회 2014 아시아연구 Vol.17 No.1
우리나라 연근해 어선에 승선하는 외국인 선원은 지속적으로 증가하고 있으나 고용허가제와 외국인선원제로 양분된 제도와 낮은 임금, 그리고 열악한 근로환경으로 인해 많은 외국인 선원들이 승선지를 무단이탈하여 불법체류자로 전락하거나 범죄에 가담하고 있어 우리사회의 큰 사회문제로 대두되고 있다. 국내 외국인 선원 관리업체는 전국에 17개소가 운영 중이나 본사가 부산, 서울에 있어 전국에 흩어진 외국인 선원들의 관리가 소홀하다보니 방치되어 있고, 근무지를 이탈한 외국인 선원들이 범죄에 가담하거나 심지어 범죄조직까지 결성해 자국민이나 내국인들을 상대로 범죄를 저지른다. 국내 연근해 어선의 부족한 선원 노동인력 확보를 위해 해마다 외국인 선원노동자의 수가 증가하고 있으나 외국인 선원의 무단이탈로 인해 발생되는 범죄가 강력 범죄로 나타나 이에 대한 대책마련이 시급하다. 이를 위해 외국인 선원노동자의 최저임금 인상과 근로조건을 개선하고, 외국인 선원노동자가 고용된 업종별 특성에 맞는 맞춤교육이 필요하며, 무엇보다 이들을 일괄적으로 관리할 수 있는 시스템의 제도완비가 절실히 요구된다. There are a constantly increasing number of foreign seamen who are joining coastal and inshore fishing boats of this country. But due to control by both the employment permit system and the foreign crew system, low wages and poor working conditions, many of those foreigners are getting away without permit from a region where they are under jurisdiction to be an illegal immigrant and even commit a crime, emerging as one of the serious social problems of this nation. Currently, there are 17 businesses of foreign crew management around the nation. However, most of their headquarters are located in Busan or Seoul. For this reason, they are difficult to manage foreign seamen who are scattered throughout the country. In other words, those seamen are left uncontrolled. Under this circumstance, some of them divert themselves from their workplace. Then they joint a crime or even organize a crime group that cause damages to their compatriots or Koreans. Due to a shortage of labor, coastal and inshore fishing boats of this country are showing an annual increase in the employment of foreign seamen. As an aftermath, there are increasing felonies that are committed by some foreign semen who leave their work without consent. Now it`s time to urgently take appropriate measures. What may be included in those measures are increasing the minimum wage for foreign seamen and improving their working conditions, providing customized education to them in accordance with their job type and, even more importantly, building up a system that totally manage and control those foreign workers.