• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1106-1108
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• 2009

TETRA(Terrestrial Trunked Radio)는 ETSI(European Telecommunications Standards Institute)에서 지정한 유럽 이동 무선 통신 기반의 표준이다. 본 논문은 TETRA 네트워크에서 트래픽에 따른 모뎀 성능 테스트와 그 결과 분석을 다룬다. TETRA 네트워크에서는 전송 방식에 따라 SDS(Short Data Service)와 PDS(Packet Data Service)로 나뉘게 되는데 본 논문에서는 PEI(Peripheral Equipment Interface)를 이용하여 SDS 전송 방식의 성능측정및 평가를 하였다. 본 측정에서는 최대 140바이트가 전송 가능한 SDS-Type 4가 사용 되었다. 성능 측정은 SDS메시지 데이터의 길이의 차이와 전송간격에 차이를 두어 측정하였다. 전송길이는 10에서 140바이트로 매 10바이트 단위씩 증가하였다. 전송 간격은 각각 0.5초, 1.0초, 1.5초씩 차이를 두어 측정하였고, 전송횟수는 각각 1000번씩 전송하였다. 테스트에 사용된 TETRA 모뎀은 UNIMO 사의 MU-1000MD이 사용되었다.

• Journal of Information Processing Systems
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• v.10 no.3
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• pp.483-490
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• 2014

In today's world, communication, the sharing of information, and money transactions are all possible to conduct via the Internet, but it is important that it these things are done by the actual person. It is possible via several means that an intruder can access user information. As such, several precautionary measures have to be taken to avoid such instances. The purpose of this paper is to introduce the idea of a one-time password (OTP), which makes unauthorized access difficult for unauthorized users. A OTP can be implemented using smart cards, time-based tokens, and short message service, but hardware based methodologies require maintenance costs and can be misplaced Therefore, the quick response code technique and personal assurance message has been added along with the OTP authentication.

• Convergence Security Journal
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• v.20 no.3
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• pp.3-11
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• 2020

The social networking service (SNS) is free, but the data usage fee paid to the telecommunications company and the member's information must be provided directly or indirectly. In addition, while SNS' specifications for transmitting and receiving devices such as smart-phones and PCs are increasing day by day, using universal transmission protocols in special environments such as contaminated areas or semiconductor manufacturing plants where work instructions are mainly made using short messages is not easy. It is not free and has a problem of weak security. This paper verified the practicality through the operation test by implementing IMCP, a low-power, low-cost message transmission protocol that aims to be wearable in special environments such as risk, pollution, and clean zone based on ATmega128.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.11-14
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• 2005

In this paper, we propose a method for transmitting SMS(Short Message Service) for VoIP(Voice over IP) service supporting multi-protocol. The multi-protocol VoIP under consideration are generally composed of H.323, SIP and MGCP and Most ITSPs(Internet Telephony Service Provider) provide VoIP service with H.323 and SIP now. SMS is killer application in mobile telecom service and many people of various field use that service. For example, user can send many SMS messages and substitute e-mail. Also SMS can be provided with various internet application. Ahn, legacy phone of KT, can use SMS. Therefore VoIP phone also can be required with the same requirement. With the multi-protocol VoIP we will propose several methods sending efficiently SMS. To show the validity of the proposed method some examples are given in which the results can be expected by intuitive observation.

• The KIPS Transactions:PartD
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• v.10D no.2
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• pp.317-326
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• 2003

The possession rate of residential telephones tend to decrease as mobile phones are widely spread. There is also a decrease in the access rate of the qualified respondents due to the low rate of phone book registration and that of house owner's presence at home. Such a change in telephone survey environment calls for another survey-channel which makes good use of new telecommunication services. In this paper, a mobile survey system was designed and performed by the use of SMS (Short Message Service) which is a kind of mobile data communication service. The system draws the sample by using random digit sampling based on 'quota allocation', and sends the SMS to the sample according to the arranged scheduler. Then, the survey-panel which received the SMS connects to the responding server by pressing the 'send' button (which is connected by the callback number), responding to the question. As a result, the responding value is stored in the database and is analyzed in real-time. This system is distinguished from other research methodologies for its simplicity in data collection, its inexpensive research price, and the innovatively low research time.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.22 no.3
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• pp.103-117
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• 2017

This note provides technical guide on three issues associated with establishing and automatically running regional ocean forecasting systems: (1) a strategy for continuous production of hourly-interval three-day ocean forecast data, (2) the daily download of ocean and atmospheric forecasting data (i.e., HYCOM and NOAA/NCEP GFS data), which are provided by outside institutions and used as initial condition, surface forcing, and boundary data for regional ocean models, and (3) error notifications to numerical model managers through the Short Message Service (SMS). Guidance on dealing with these three issues is illustrated via solutions implemented by the Korea Hydrographic and Oceanographic Agency, since in embarking on this project we found that this procedural information was not readily available elsewhere. This technical guide is based on our experiences and lessons learned during the process of establishing and operating regional ocean forecasting systems for the East Sea and the Yellow and East China Seas over the 5 year period of 2012-2016. The fundamental approach and techniques outlined in this guide are of use to anyone wanting to establish an automatic regional and coastal ocean forecasting system.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.05a
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• pp.905-907
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• 2014

Twitter is the special place that people in the world can freely share their information and opinion. There are tries to utilize a vast amount of information made from twitter. The study on classification of tweets by subject is actively conducted. Twitter is a service for sharing information with short 140-characters text message. The short message including brief content makes extracting a variety of information hard. In the paper, we suggests the method to classify tweet by subject. The method uses both tweet and subject features. In order to conduct experiments to verify the proposed method, we collected 10,000 tweet messages with the Twitter API. Through the experimental results, we will show that the performance of our proposed method is better than those of previous methods.

• International journal of advanced smart convergence
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• v.2 no.1
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• pp.30-31
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• 2013

In the recent years, as smart phones popularized, the number of people who use IMS (instant messaging service) and SNS (social network service) rapidly has increased as the usage of SMS (short message service) relatively decreased. That is why this thesis suggests a contact control service based on Android. It contains an inducing function that calls acquaintances, which were given a score based on the level of familiarity from saved contacts and call logs. And it provides an overall ranking of call log in order to grasp frequently called people. This developed system was tested on Samsung Galaxy S2 and LG Optimus LTE / Android 2.2 which were the main smart phone models.

• Proceedings of the KIEE Conference
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• 2002.07d
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• pp.2093-2095
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• 2002

Nowadays, there are actually lots of changes in wireless communications of Korea. But it is not an exact PTP(Peer to Peer) Communication. In other words, a mobile station which can find fixed station can be connected with wireless internet server or other services, oppositely fixed station cannot approach to mobile station. Even though it exists, it is difficult to communicate with full duplex. We can service using CDMA 1X techniques such as cellular based SMS (Short Message Service) service or very simple MPRG Services. In this paper, we propose a system, using DirectX based mobile/fixed station stand alone program, depending on bandwidth of wireless service provider, tranceiving high resolution moving picture or reliable data regularly by a fixed connection each other.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.178-180
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• 2002

최근 네트워크 고속화로 인한 무선 정보전송의 이용이 다양해져 이동국과 이동전화 교환기간 문제가 생긴 중계기를 발견할 수 있다. 이러한 문제 발생시 문제 사항들을 감시하여 적절한 조치를 취할 수 있도록 도와주는 모니터링 시스템이 요구된다. 본 논문에서는 중계기에 리눅스 임베디드 운영체제를 장치한 장비를 통해 네트워크 관리 프로토콜인 SNMP를 이용하여 중계기 사망을 감시하고 CDMA의 단문 메시지 서비스를 통해 관리자와 중계기간에 정보를 네트워크 상으로 전달될 수 있도록 설계하였다. 이에 중개기상의 SNMP 데이터 패킷을 CDMA 방식의 SMS로 변환하여 관리자의 시스템으로 메시지를 전달하는 모니터링 시스템 설계를 제안한다.