• Journal of the Korea Institute of Building Construction
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• v.8 no.6
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• pp.107-115
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• 2008

Bearing wall apartments have been introduced to meet the needs of population growth in metropolis since 1980 in Korea. It is extremely difficult to remodel bearing wall apartments. Noises and vibrations generated between floors are also problems to solve. This paper introduces rahmen structures that enable easy remodel. Modularized Hybrid System(MHS) is demonstrated to be effective in terms of material quantity, construction costs, and amount of $CO_2$ emission compared with those of bearing wall structures. Housings with MHS composite girder ensure the flexibility of architectural plan and easy remodel while the floor heights are maintained the same as bearing wall structures. The reduction of the concrete and reinforcing steels tonnage decreased construction cost of MHS multi-residential housings. The $CO_2$ omission was also diminished in accordance with the reduction of construction materials. This paper describes new structural system adapting MHS frames to propose the extended life of residential housings and reduce the national resources by preventing unnecessary rebuilding of housings.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.7 no.3
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• pp.117-128
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• 1997

When computer systems with mandatory access control mechanism are interconnected each other for enforcing the MHS(Message Handling System) security on the multilevel secure distributed network environment, illegal information flow may occurs due to the unexpected cascade vulnerability problem. In this paper, new MHS security policy and security property functions are proposed for preventing the cascade vulnerability.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.11
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• pp.2409-2424
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• 1997

Multicasting to mobile hosts(MHs) based on broadeasting results in overloaded unnecessary messages in case of th number of recipient MHs is relatively small compared with that of nodes in a network. In this paper we propose an improved multicast protocol in which messages are selectively flooded only to the (radio) cells within some distance from the cells where destination MHs reside most recently, so that the number of unnecessary messages carried in broadcasting is reduced. Detailed procedures for the protocol are provided and protocol properties are proven.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1990.10a
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• pp.358-361
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• 1990

• 한국생물공학회:학술대회논문집
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• 2000.04a
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• pp.89-91
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• 2000

Polynuclear aromatic hydrocarbon (PAH) compounds are highly carcinogenic chemicals and common groundwater contaminants that are observed to persist in soils. The adherence and slow release of PAHs in soil is an obstacle to remediation and complicates the assessment of cleanup standards and risks. Biological degradation of PAHs in soil has been an area of active research because biological treatment may be less costly than conventional pumping technologies or excavation and thermal treatment. Biological degradation also offers the advantage to transform PAHs into non-toxic products such as biomass and carbon dioxide. Ample evidence exists for aerobic biodegradation of PAHs and many bacteria capable of degrading PAHs have been isolated and characterized. However, the microbial degradation of PAHs in sediments is impaired due to the anaerobic conditions that result from the typically high oxygen demand of the organic material present in the soil, the low solubility of oxygen in water, and the slow mass transfer of oxygen from overlying water to the soil environment. For these reasons, anaerobic microbial degradation technologies could help alleviate sediment PAH contamination and offer significant advantages for cost-efficient in-situ treatment. But very little is known about the potential for anaerobic degradation of PAHs in field soils. The objectives of this research were to assess: (1) the potential for biodegradation of PAH in field aged soils under denitrification conditions, (2) to assess the potential for biodegradation of naphthalene in soil microcosms under denitrifying conditions, and (3) to assess for the existence of microorganisms in field sediments capable of degrading naphthalene via denitrification. Two kinds of soils were used in this research: Harbor Point sediment (HPS-2) and Milwaukee Harbor sediment (MHS). Results presented in this seminar indicate possible degradation of PAHs in soil under denitrifying conditions. During the two months of anaerobic degradation, total PAH removal was modest probably due to both the low availability of the PAHs and competition with other more easily degradable sources of carbon in the sediments. For both Harbor Point sediment (HPS-2) and Milwaukee Harbor sediment (MHS), PAH reduction was confined to 3- and 4-ring PAHs. Comparing PAH reductions during two months of aerobic and anaerobic biotreatment of MHS, it was found that extent of PAHreduction for anaerobic treatment was compatible with that for aerobic treatment. Interestingly, removal of PAHs from sediment particle classes (by size and density) followed similar trends for aerobic and anaerobic treatment of MHS. The majority of the PAHs removed during biotreatment came from the clay/silt fraction. In an earlier study it was shown that PAHs associated with the clay/silt fraction in MHS were more available than PAHs associated with coal-derived fraction. Therefore, although total PAH reductions were small, the removal of PAHs from the more easily available sediment fraction (clay/silt) may result in a significant environmental benefit owing to a reduction in total PAH bioavailability. By using naphthalene as a model PAH compound, biodegradation of naphthalene under denitrifying condition was assessed in microcosms containing MHS. Naphthalene spiked into MHS was degraded below detection limit within 20 days with the accompanying reduction of nitrate. With repeated addition of naphthalene and nitrate, naphthalene degradation under nitrate reducing conditions was stable over one month. Nitrite, one of the intermediates of denitrification was detected during the incubation. Also the denitrification activity of the enrichment culture from MHS slurries was verified by monitoring the production of nitrogen gas in solid fluorescence denitrification medium. Microorganisms capable of degrading naphthalene via denitrification were isolated from this enrichment culture.

• Korean Journal of Culture and Social Issue
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• v.28 no.4
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• pp.577-595
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• 2022

The purposes of the study is to classify the psychological characteristics of gamblers using by latent profile analysis and to identify the consequences according toof the latent profiles. The subjects of the study are 473 adults gamblers who responded to a online survey about gambling patterns, basic psychological needs(BPNs), and mental health status(MHS) such as stress, depression, and anxiety. Using latent profile analysis known as the person-centered analysis, the results showed that psychological characteristics of gamblers were classified into three groups: 'Lower MHS-BPNs', 'Middle MHS-BPNs', and 'Upper MHS-BPNs'. Also, the as outcome variable, levels of problematic gambling(KCPGI) showed significant differences across the latent profiles such as Problem gambling(M=11.393) on 'Lower MHS-BPNs', Moderate-risk gambling(M=4.277) on 'Middle MHS-BPNs' and Low-risk gambling (M=1.718) on 'Upper MHS-BPNs'. Overcoming the limitations of variable-centered analysis in the existing studies, this study providesreveals new insights onin the psychological characteristics of gamblers and how different latent profiles of gamblers may be in theirdistinct levels of problematic gambling. Finally, limitations of the study and future directions for research on gambling problems are discussed.

• Atmosphere
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• v.28 no.2
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• pp.163-174
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• 2018

In order to assimilate MHS satellite data into the convective scale model at KMA, ATOVS data are reprocessed to utilize the original high-resolution data. And then to improve the preprocessing experiments for cloud detection were performed and optimized to convective-scale model. The experiment which is land scattering index technique added to Observational Processing System to remove contaminated data showed the best result. The analysis fields with assimilation of MHS are verified against with ECMWF analysis fields and fit to other observations including Sonde, which shows improved results on relative humidity fields at sensitive level (850-300 hPa). As the relative humidity of upper troposphere increases, the bias and RMSE of geopotential height are decreased. This improved initial field has a very positive effect on the forecast performance of the model. According to improvement of model field, the Equitable Threat Score (ETS) of precipitation prediction of $1{\sim}20mm\;hr^{-1}$ was increased and this impact was maintained for 27 hours during experiment periods.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1992.04b
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• pp.476-485
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• 1992

기업간에 교환되는 문서를 EDI의 자료 구조를 이용하여 효율적으로 전송하고 저장할 수 있다. 본 연구는 이를 위한 변환 처리 스프트웨어인 KU-EDI를 이용하여 작성되는 메시지들에 대한 통신처리를 위한 통신 프로토콜에 관한 연구이다. EDI시스템을 지원하는 프로토콜들인 X.400MHS(Message Handling System), X.435 PEDI, FTAM(File Transfer Access Management), X.25, Odette FTP(File Transfer Protocol)들에 관해 조사 연구 및 비교분석을 하였다. KU-EDI를 위한 통신 프로토타입 모델로서 현재 EDI를 가장 잘 지원해 주는 OSI의 MHS에 기초하여 UA(User Agent), MS(Message Store), 그리고 MTA(Message Transfer Agent)로 구분을 해서 시스템을 설계하고 구현했다. 이 EDI/MHS모델에서 UA, MS, MTA는 한 시스템내에서 상호작용 한다.

• Proceedings of the Acoustical Society of Korea Conference
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• 1994.06a
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• pp.885-892
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• 1994

This paper presents the Korean text-to-speech (TTS) algorithm with speed and intonation control capability, and describes the development of the Voice message delivery system employing this TTS algorithm. This system allows the Interpersonal Messaging (IPM) Service users of Message Handling System (MHS) to send his/her text messages to user via telephone line using synthetic voice. In the X.400 MHS recommendation, the protocols and service elements are not specified for the voice message delivery system. Thus, we defined access protocol and service elements for Voice Access Unit based on the application program interface for message transfers between X.400 Message Transfer Agent and Voice Access Unit. The system architecture and operations will be provided.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.8
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• pp.1117-1127
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• 1993

전자우편서비스가 확대됨에 따라 정보 보호 문제가 중요한 현안으로 대두될 것이다. 이러한 필요성에 따라, MHS(Message Handling System) 시스템의 정보보호(Information Security) 서비스에 관련된 표준화(X.400 series)와 보안 서비스에 관련된 키 관리 메카니즘 표준화(X.509)출 분석하려다. 본 연구에서는 여러가지 보안서비스 중, 안전한 메시지 전송을 위해 1차적으로 메시지 비밀보장, 메시지 무결성, 발신처 인증 서비스를 위 한 SMP(Secure Message Protocol ) 프로토콜을 설계하여 UNIX BSD 4.3 시스템환경에서 구현하였다.