baber/WOPTO huggingface dataset:
Patent KR-20160032953-A (KR)
Inventor: MIN SUNG HWA
IPC: F24H9/06
Filed: 2014-09-17
Abstract: 본 발명은 숯가마를 이용한 난방장치에 관한 것으로서, 숯가마 쪽으로 물을 공급하는 복수개의 입수펌프를 갖는 기계실; 상기 입수펌프로부터 물을 공급받는 열교환파이프; 상기 열교환파이프로 감싸져 있는 가마 본체를 복수개로서 이격 배치하고 있고, 보온재로 상기 가마 본체 및 상기 열교환파이프의 외부를 덮고 있는 숯가마; 및 상기 숯가마의 아래쪽 지하에 배치되고, 장기간 폐열 사용처에서 물을 사용할 수 있도록, 상기 열교환파이프에 채워진 물의 체적보다 상대적으로 많은 물을 저장할 수 있는 저수용량을 갖고, 단열재로 감싸져 있는 지하저장탱크를 포함한다.
Patent KR-20160032972-A (KR)
Title: Display apparatus
Inventor: SUNG JAE HYUN
IPC: G09F9/00
Filed: 2014-09-17
Abstract: Disclosed is a display device including: a display panel; a module cover joined to a rear side of the display panel; a driving unit which is joined to the module cover and applies force to at least a portion of the module cover to make the module cover and the display panel remain in a first state where the module cover and the display panel are flat or in a second state where the module cover and the display panel are curved; and a shielding unit which is located in at least a portion of an outer circumference of the driving unit to cover an area between the driving unit and the module cover in the second state. According to the present invention, a pattern or a terminal unit of the display device can be prevented from being exposed to a user as the driving unit is covered when the display panel is curved.
Patent KR-20150037648-A (KR)
IPC: C08F279/06
Filed: 2014-09-30
Abstract: The present invention relates to an MBS-based impact modifier, a manufacturing method thereof, and a polyvinyl chloride resin composition. The present invention provides an MBS-based impact modifier that can improve the bulk density, fluidity and caking characteristics of polyvinyl chloride resin compared with an existing MBS without deteriorating properties and can improve impact resistance or the like during coagulation by inputting more crosslinking nanoparticles instead of a hard polymer, which is traditionally used during coagulation; a manufacturing method thereof; and a polyvinyl chloride resin composition including the same and having excellent impact strength and processability. The MBS-based impact modifier comprises: 100 parts by weight of an MBS graft copolymer; and 1 to 7 parts by weight of acrylate-based crosslinking nanoparticles.
Patent KR-20150043983-A (KR)
IPC: H01L21/683
Filed: 2014-10-10
Abstract: The present invention relates to a substrate support unit for supporting a substrate, comprising: an up and down operation unit having a transfer table which transfers the substrate up and down; a support which is installed on a side of the transfer table in a vertical direction, wherein the substrate is supported on a surface; and an elastic machine installed to connect a gap between the transfer table and the support and having an elastic force. Therefore, according to an embodiment of the present invention, as an upper support is manufactured by the same structural steel like metal or metal alloy, a support surface of the upper support wherein the substrate is supported has a better ground plan in comparison with a support surface of a conventional elastic body plate. In other words, the ground plan of the upper support of the present invention wherein the substrate is supported is improved in comparison with the conventional elastic body plate having ductility. Moreover, as the elastic machine is installed to connect a gap between the support and the transfer table, when an upper substrate is bound to a lower substrate, an inclination of the upper substrate or height adjustment of a specific area is enabled for the upper substrate to be bound to the lower substrate in parallel, thereby suppressing or preventing the upper substrate and the lower substrate from being bound in a twisted alignment state.
Patent KR-20160044767-A (KR)
Inventor: LYU MYUNG SEOK
IPC: F02B37/18
Filed: 2014-10-16
Abstract: The present invention relates to an LP-EGR system of a natural gas engine having a spiral recirculation pipe, and a method for controlling the same. According to one embodiment of the present invention, the LP-EGR system of a natural gas engine having a spiral recirculation pipe comprises: a turbo charger (10) comprising a turbine (11), a rotational shaft (12), and a compressor (13); and a recirculation pipe (40) enabling exhaust gas to recirculate. The recirculation pipe (40) recovers the exhaust gas to be injected into a first intake air pipe (31). According to the present invention, the present invention can prevent, in advance, corrosion caused by condensate.
Patent KR-20160045384-A (KR)
Inventor: HAN JIN SUK
IPC: G03B3/10
Filed: 2014-10-17
Abstract: An embodiment of a lens driving apparatus to improve cohesion between a magnet and a housing, comprises: a bobbin which has an outer surface to install a first coil; a first magnet arranged around the bobbin to face the first coil; and the housing arranged to surround at least part of the bobbin, having a first magnet mounting part which accommodates the first magnet. An adhesive inlet may be formed in the housing; and the adhesive inlet connects an outer surface of the housing to a lateral surface of the first magnet mounting part.
Patent KR-20160051913-A (KR)
Title: 잎을 포함한 홍삼 제조 방법 및 이에 의해 제조된 홍삼
Inventor: KIM JONG SEOG
IPC: A23L5/10
Filed: 2014-10-21
Abstract: 본 발명은 수삼과 홍삼 중 어느 하나 또는 모두에 인삼의 잎을 증삼기의 채반에 배열하는 채반배열단계; 상기 채반에 배열된 수삼과 홍삼 중 어느 하나 또는 모두와 인삼의 잎을 수증기로 증삼기 내의 온도를 상온에서부터 40분~3시간 동안 승온시켜서 70~80℃ 이하로 유지하여, 수삼과 홍삼 중 어느 하나 또는 모두와 인삼의 잎에 저장 내지 축적된 인삼배당체를 당화시키는 당화유도단계; 상기 당화유도단계 이후, 수삼과 홍삼 중 어느 하나 또는 모두와 인삼의 잎을 수증기로 2~24시간 동안 80~100℃로 증숙시키는 증숙단계; 및 상기 증숙단계를 마친 수삼과 홍삼 중 어느 하나 또는 모두와 인삼의 잎을 건조시키는 건조단계;를 포함하는 잎을 포함한 홍삼 제조 방법과, 이에 의해 제조된 홍삼 및 건조물에 관한 것이다. 
본 발명에 의하면, 인체에 대한 홍삼의 이로운 성분, 예컨대 진노세이드의 함량을 높일 수 있고, 이로 인해 홍삼의 이로운 효능을 극대화시킬 수 있으며, 홍삼 등의 제품 가치를 높임으로써 수익을 증대시킬 수 있다.
Patent KR-20160049153-A (KR)
Inventor: SONG CHI SU
IPC: B63H5/16
Filed: 2014-10-24
Abstract: A propulsion efficiency enhancing apparatus is disclosed. According to an embodiment of the present invention, the propulsion efficiency enhancing apparatus comprises current fixing blades equipped in front of a propeller, and radially equipped around the rotating shaft of the propeller. The current fixing blades are positioned at regions, from among the left region and right region of the revolution surface of the propeller, at which the propeller rotates upward. Moreover, the span length of at least one of the current fixing blades is different from that of the current fixing blades, and the span length of an arbitrarily selected current fixing blade from among the current fixing blades is greater than or equal to that of another current fixing blade disposed directly thereunder.
Patent KR-20160053022-A (KR)
Title: Cross Head Bearing having Lubricating Function on Dry Turning
Inventor: PARK DEUK JIN
IPC: F16C33/10
Filed: 2014-10-30
Abstract: The present invention relates to a cross head bearing wherein a lubricating function is added. The cross head bearing wherein the lubricating function is added comprises: a main body to store a cross head pin to convert a vertical reciprocating motion of a piston into a rotation of the piston; a contact unit formed on the main body, receiving a load of the cross head pin; and a lubricating unit formed along a circumference of the contact unit, storing lubricating oil to reduce friction between the lubricating unit and the cross head pin. The purpose of the present invention is to provide the cross head bearing wherein the lubricating function is added, and storing the lubricating oil in a portion receiving the load of the cross head pin.
Patent KR-20160054345-A (KR)
Inventor: CHA YOUNG SEO
IPC: G06F3/048
Filed: 2014-11-06
Abstract: Disclosed is a mobile device capable of connecting a security system containing security information to a widget. The mobile device includes a storing unit and a control unit. The storing unit stores a main application for security interlocked with the security system and a security widget of the main application. The control unit loads the security widget stored in the storing unit. The security widget includes a connection setting unit and a medium connecting unit. The connection setting unit uses connection setting information shared by the main application to set a connection with a security channel of the security system. The medium connecting unit includes a monitoring image connecting unit for receiving and displaying a monitoring image frame of the monitoring channel from the connected security system.
Patent KR-20160011557-A (KR)
Inventor: YOU JIANG
IPC: C08G59/62
Filed: 2014-11-06
Abstract: The present invention relates to a halogen-free resin composition and to a prepreg and a printed circuit laminate using the same. The halogen-free resin composition comprises, with respect to 100 parts by weight of an organic solid, (A) 30-60 parts by weight of a bisphenol-type epoxy resin; (B) 5-45 parts by weight of a benzoxazine resin; (C) 10-30 parts by weight of an alkyl phenol novolac hardening agent; and (D) a phosphorus-containing flame retardant. The structure of the bisphenol-type epoxy resin has relatively many branched-chain alkyl groups and benzene rings so the halogen-free resin composition has a relatively high glass transition temperature, low absorptivity, good heat resistance and excellent dielectric performance. In addition, an alkyl phenol novolac is used as a hardening agent so the halogen-free resin composition sufficiently exhibits advantages of excellent dielectric performance and low absorptivity due to relatively many alkyl groups. A prepreg and a printed circuit laminate manufactured by using a halogen-free thermosetting resin composition have a high glass transition temperature, a low dielectric constant, a low dielectric loss factor, low absorptivity, high heat resistance, and good flame retardance, processability and chemical resistance.
Patent KR-20160055593-A (KR)
Title: Uv도료를 주재로 한 판재의 홀로그램 문양 형성방법
Inventor: JEON KWANG SIK
IPC: B41M3/12
Filed: 2014-11-10
Abstract: 본 발명은 UV도료를 주재로 한 판재의 홀래그램 문양형성방법에 관한 것으로, 
판재에 UV도료를 도포한 뒤, 도포된 UV도료가 겔 상태로 반 건조된 상태에서 홀로그램 문양이 형성된 필름을 덮고 롤러로 롤링한후, UV램프를 조사하여 완전 경화 시킨다음, 홀로그램 필름을 즉시 제거하도록 함으로써 작업성과 생산성을 극대화한 UV도료를 주재로 한 판재의 홀래그램 문양형성방법을 제공하는데 그 특징이 있다.
Patent KR-20160056704-A (KR)
Inventor: KIM HAK DON
IPC: A61B1/012
Filed: 2014-11-12
Abstract: Disclosed is a head cap for an endoscope, which has a plurality of holes for receiving a lens, a light, a fluid channel, and a working channel and is mounted on the front end of an endoscope tube. The head cap for an endoscope comprises: a circular upper surface; and a side wall extending vertically downward along the circumference of the upper surface. A lens hole for receiving an optical unit having a lens formed on the front end thereof, a lighting hole formed on one side or both sides of the lens hole to be adjacent to the lens hole and receiving a lighting means, a fluid nozzle having an opening toward the lens hole or the lighting hole and connected to the front end of a fluid channel received in the tube, and a working hole formed adjacent to the fluid nozzle and connected to the front end of a working channel embedded in the tube are formed on the upper surface. Therefore, the head cap for an endoscope can secure visibility by disposing the lighting means adjacent to the optical unit.
Patent KR-20160058311-A (KR)
Inventor: KIM HYO SIK
IPC: G02F1/1343
Filed: 2014-11-14
Abstract: The present invention relates to a liquid crystal display device. According to an embodiment, the liquid crystal display device comprises: a first substrate; a first subpixel electrode including a first sub-area and a second sub-area, arranged on the first substrate and applied with a first voltage; a second subpixel electrode, arranged on the first substrate and applied with a second voltage, including a third sub-area, a fourth sub-area, and a fifth sub-area; an insulation film arranged on the first sub-area of the first subpixel electrode and the third sub-area of the second subpixel electrode and arranged under the second sub-area of the first subpixel electrode and the fourth and fifth sub-areas of the second subpixel electrode; a second substrate facing the first substrate; and a liquid crystal layer arranged on the second substrate and between a common electrode and the first and second substrates. Additionally, the first sub-area of the first subpixel electrode and the fourth sub-area of the second subpixel electrode are piled up on one another. The purpose of the present invention is to improve the side visibility as much as the front visibility and to provide accurate colors on the side.
Patent KR-20160062937-A (KR)
Title: 기판 보호용 내산성 수지 조성물
Inventor: HONG SEONG JAE
IPC: C08G59/08
Filed: 2014-11-26
Abstract: 내산성 수지 조성물은 수지 혼합물, 무기 충전재 및 여분의 용매를 포함한다. 상기 수지 혼합물은 20 내지 50 중량% 포함되며, 페놀(phenol) 구조를 갖는 노블락(novolac) 수지를 포함한다. 상기 무기 충진재는 5 내지 50 중량%로 포함된다.
Patent KR-20160040976-A (KR)
Title: Method for manufacturing living commodity using Turmeric leaf
Inventor: AN MIN SIL
IPC: A61K8/97
Filed: 2014-11-28
Abstract: Provided is a bath product containing an extract of turmeric leaves. More specifically, provided s a bath product containing an extract of turmeric leaves, which can be one of shampoos, soaps, or bath preparations.
Patent KR-20160065313-A (KR)
Inventor: KIM SEUNG JUNG
IPC: H02G3/04
Filed: 2014-11-28
Abstract: The present invention relates to a cable block device to which an assembly function is added and an assembling method thereof. The cable block device comprises: a support unit configured to support a power cable for supplying power to a vehicle carrying a target; a cover unit separately coupled to the support unit; and a first accommodation unit formed on one side of a coupling portion of the support unit and the cover unit and configured to accommodate the power cable. Therefore, the cable block device can improve productivity of a product.
Patent KR-20160038668-A (KR)
Title: A component sucking head
Inventor: TSUTSUMI TAKUYA
IPC: H05K13/04
Filed: 2014-12-04
Abstract: An aspect of the present invention provides a component suctioning head which includes a nozzle that suctions a component from a component supply unit, an elevation unit that elevates the nozzle, a negative pressure supply unit that supplies negative pressure for allowing the nozzle to suction the component, a gripping sensor that senses that the lowered nozzle grips the component when the nozzle is lowered to suction the component, and a control unit that controls the elevation unit and the negative pressure supply unit. The control unit memorizes a timing sensed by the gripping sensor when the nozzle grips the component during a first component suctioning operation as a gripping timing, and sets an operation initiating timing of the negative pressure supply unit based on the memorized gripping timing during the next component suctioning operation.
Patent KR-20160071008-A (KR)
Title: A half power buffer amplifier
Inventor: KIM MUN GYU
IPC: H03F3/45
Filed: 2014-12-11
Abstract: A half-power buffer amplifier is disclosed. An embodiment of the present disclosure comprises first and second amplifying blocks respectively corresponding to first and second channels, a first output buffer unit controlled by an output from the first amplifying block, and a second output buffer unit controlled by an output from the second amplifying block. Each of the first and second amplifying blocks includes: an input unit configured to differentially amplify first and second input signals and to output first to fourth differential currents; and an amplifying unit including a first current mirror, a second current mirror, and a bias unit connected between the first current mirror and the second current mirror. The first current mirror includes first and second transistors connected in series at a first node configured to receive the first differential current, and third and fourth transistors connected in series at a second node configured to receive the second differential current. The second current mirror includes fifth and sixth transistors connected in series at a third node configured to receive the third differential current, and seventh and eighth transistors connected in series at a fourth node configured to receive the fourth differential current. The second and fourth nodes of the first to second amplifying blocks are selectively connected to first source and drain terminals of the fourth and eighth transistors of the first and second amplifying blocks in response to a control signal.
Patent KR-20160074056-A (KR)
Inventor: KIM YONG SU
IPC: G08B17/00
Filed: 2014-12-18
Abstract: Provided is an emergency notification system. When a gas mask in a gas mask cabinet installed in a building or underground space is used in an emergency, the emergency notification system can automatically notify the situation to a public institution such as a first station or the like, and can quickly inform people of a state of emergency of a corresponding building. According to the present invention, when the gas mask is separated from the gas mask cabinet, the emergency notification system can detect the separated state of the gas mask, and can transfer an emergency situation to a server of a rescue center to notify the emergency situation. The emergency notification system includes at least one detection part, a server, and a display.
Patent KR-20160079974-A (KR)
Title: Light emitting device package
Inventor: PARK MYOUNG BO
IPC: H01L33/62
Filed: 2014-12-26
Abstract: A light emitting device package according to the embodiment of the present invention includes a package body having a mounting space, first and second lead frames which are prepared on the package body, a light emitting element which is arranged on the upper parts of the first and second lead frames in the mounting space, and is electrically connected to the first and second lead frames, and a support part which is arranged on the lower parts of the first and second lead frames, has a region which is overlapped with at least part of a space between the first and second lead frames, and includes a different material from the package body. So, the light emitting device package with high reliability can be provided.
Patent KR-20160079999-A (KR)
Title: Martensitic stainless steel and manufacturing method thereof
Inventor: LEE JAE HWA
IPC: C21D1/26
Filed: 2014-12-26
Abstract: The present invention relates to a martensitic stainless steel, and a manufacturing method thereof. According to the present invention, the manufacturing method for the martensitic stainless steel comprises: a first heat treatment step of distributing Cu precipitate in a crystal grain and a grain boundary of a hot rolled steel sheet including 0.55-0.65 wt% of C, 0.1-0.6 wt% of Si, 0.3-1.0 wt% of Mn, 12-14 wt% of Cr, 0.1-0.4 wt% of Ni, 1.0-2.0 wt% of Cu, 0.08-0.12 wt% of N, 0.1-0.15 wt% of Sn, and the remainder consisting of Fe and inevitable impurities; a second heat treatment step of distributing Cr carbides in the crystal grain and the grain boundary of the hot rolled steel sheet after the first heat treatment step; a third heat treatment step of spheroidizing fine particles of the Cr carbides after the second heat treatment step; a step of cold rolling the hot rolled steel plate after the third heat treatment step; and a step of hardening the cold rolled steel plate.
Patent KR-20160080217-A (KR)
Title: Compound playing function bed
Inventor: BAE MOON YOUNG
IPC: A47C19/22
Filed: 2014-12-29
Abstract: The present invention relates to a bed having various playing functions, which maximally uses a space. The bed having various playing functions comprises a detachable panel which is formed in the rear wall of the bed, wherein the detachable panel is used as a ladder, a slide, a table, etc.
Patent KR-20160083157-A (KR)
Inventor: CHOI SOEK MIN
IPC: H01L51/56
Filed: 2014-12-30
Abstract: Embodiments of the present invention relate to a controller, an organic light emitting display panel, an organic light emitting display device, and a driving method thereof to prevent a decrease phenomenon of image quality by a voltage drop of driving voltage by newly defining a brightness decrease and a brightness variation phenomenon by the voltage drop of the driving voltage as a factor of a decrease in image quality, and compensate for the voltage drop of the driving voltage.
Patent KR-20160081463-A (KR)
Title: Cross-coupled-oscillator for generating a high frequency signal
Inventor: RIEH JAE SUNG
IPC: H03B5/18
Filed: 2014-12-31
Abstract: Provided is a cross-coupled oscillator to generate a high frequency signal, capable of separately applying a bias to a base and a collector without a DC blocking capacitor. The disclosed cross-coupled oscillator includes: a first transistor which includes a first collector which receives a bias voltage from a collector bias, a first base which receives a bias voltage from a base bias through a (1-1)-th transmission line, and a first emitter; and a second transistor which includes a second collector which receives a bias voltage from the collector bias, a second base which receives a bias voltage from the base bias through a (2-1)-th transmission line, and a second emitter.
Patent KR-20160081615-A (KR)
Title: Jig for sepearating specimen from shell and method of separating specimen using the same
Inventor: KIM GU YONG
IPC: G21C17/02
Filed: 2014-12-31
Abstract: A jig for separating a specimen from a shell includes: a jig main body; a gripping member connected to the lower portion of the jig main body and gripping a thickness part of a specimen part partially cut from a shell; and a hanging member on which a line member disposed on the upper portion of the jig main body is hanged, thereby making it easy to perform the separation work of the specimen separated from the shell.
Patent KR-20160083646-A (KR)
Title: Polyoxymethylene Resin Composition and Molding Product Including the Same
Inventor: SHIN BUM SHIN
IPC: C08K5/101
Filed: 2014-12-31
Abstract: The present invention relates to a polyoxymethylene resin composition, comprising, with respect to 100 parts by weight of polyoxymethylene, 10-30 parts by weight of calcium carbonate; 0.05-0.5 parts by weight of fatty acid esters; and 0.05-1.0 parts by weight of a coupling agent. In addition, the present invention relates to a molded product manufactured by using the same. The polyoxymethylene resin composition has improved properties of impact strength, elasticity, and toughness.
Patent KR-20140051893-A (KR)
Inventor: MAEDA KOICHIRO
IPC: H01M4/13
Filed: 2012-08-03
Abstract: (과제) 집전체와 전극 조성물층 사이에 개재하고, 양자의 밀착성 향상에 기여할 수 있는 균일성이 높은 도전성 접착제층의 형성에 사용되는 전기 화학 소자 전극용 도전성 접착제 조성물을 제공하는 것. 
(해결 수단) 본 발명에 관련된 전기 화학 소자 전극용 도전성 접착제 조성물은, 도전성 카본, 이염기산 단량체 단위를 포함하는 입자상 공중합체 (A), 에틸렌성 불포화 카르복실산아미드 유도체 단위를 포함하는 입자상 공중합체 (B), 및 분산매를 포함하는 것을 특징으로 하고 있다.
Patent KR-20140022103-A (KR)
Inventor: CHEN WEI
IPC: H04L25/03
Filed: 2011-08-19
Abstract: 본 발명은 시분할 듀플렉스 다중화 필터링 방법을 개시하였으며, 해당 방법은 TDD-LTE시스템 베이스밴드 데이터 칩 속도에 따라, 데이터 송신과 수신을 수행하기 위한 타임슬롯 좌표를 생성하여 해당 타임슬롯 좌표에 따라 상응하는 타임 슬라이스에서 송신측과 수신측 데이터를 수신하며, 수신된 데이터를 성형 필터링하여 파싱 필터링 후의 데이터를 상응하는 타임 슬라이스에서 송신한다. 본 발명은 또한 시분할 듀플렉스 다중화 장치를 개시하였으며, 본 발명에서 타임슬롯 좌표를 생성하고 송신측과 수신측의 데이터를 부동한 타임 슬라이스에서 시분할 듀플렉스 다중화 성형 필터링을 수행하므로 송신측과 수신측은 더는 별도로 성형 필터를 설치할 필요가 없으며 계산 유닛과 저장 유닛의 수량을 줄여 성형 필터의 원가를 줄인다.
Patent KR-20140114806-A (KR)
Title: 도전성 입자, 도전 재료 및 접속 구조체
Inventor: WANG XIAOGE
IPC: H01B1/22
Filed: 2013-01-17
Abstract: 본 발명은 전극간을 전기적으로 접속한 경우에, 접속 저항을 효과적으로 낮게 할 수 있는 도전성 입자를 제공한다.  본 발명에 따른 도전성 입자(1)는, 기재 입자(2)와, 기재 입자(2)의 표면 상에 배치되어 있으며 니켈과 인을 포함하는 제1 도전층(3)과, 제1 도전층(3)의 외표면 상에 배치되어 있으며 팔라듐을 포함하는 제2 도전층(4)을 구비한다.
Patent KR-20140027503-A (KR)
Inventor: VISHWANATH K M
IPC: H04W4/80
Filed: 2012-07-18
Abstract: 블루투스 통신 시스템에 제시되며, 이 시스템에서 원격, 또는 목적지 무선 통신 장치는 프로필 접속을 개시하는데 요구되는 필요한 서비스 발견 프로토콜(SDP) 정보 모두를 포함하는 그의 블루투스 프로필 정보를 장치 발견 또는 조회 절차의 일부로서 EIR(Extended Inquiry Response) 메시지로 소스 무선 통신 장치에 제공한다.  응답시에, 소스 무선 통신 장치는 원격 무선 통신 장치와의 ACL 접속을 구축하고 ACL 접속을 통해 소스 무선 통신 장치의 필요한 SDP 정보를 포함하는 그 자신의 EIR 메시지를 ACL 데이터 패킷으로 제공할 것이다.  EIR 메시지의 제조업자 데이터 필드는 각 장치의 SDP 정보를 포함할 것이다.  그래서 블루투스 통신 시스템은 논리적 링크 제어 및 적응 프로토콜 층(L2CAP) 접속을 구축하고 다수의 SDP 요청 및 응답을 교환하는데 소모될 오버헤드를 보존한다.